Power generator utitlizing circulated working fluid from a pulsed electrolysis system and method of using same
A power generating system (100) and a method of operating the same is provided, the system utilizing an electrolytic heating subsystem (103). The electrolytic heating subsystem is a pulsed electrolysis system that heats a working fluid contained within a circulation conduit (107) in thermal communication with an electrolysis tank (109) of the electrolytic heating subsystem (103). As the working fluid is circulated through the circulation conduit, it is heated to a temperature above its boiling point, causing at least a portion of the working fluid to be converted to vapor (e.g., steam). The vapor is then circulated through a steam turbine (111), causing its rotation and, in turn, an electric generator (113) coupled to the steam turbine.
Under 35 U.S.C. 119, the present application claims the benefit of the earlier filing date and the right of priority to Canadian Patent Application Serial No. 2,613,897, filed Dec. 7, 2007, the disclosure of which is hereby incorporated by reference for any and all purposes.
FIELD OF THE INVENTIONThe present invention relates generally to electric power generating systems.
BACKGROUND OF THE INVENTIONPower generating systems in general, and steam power plants in particular, are well known in the art. This type of power generating system uses any of a variety of heat sources to heat water in order to produce steam. The steam flows into one or more turbines which spin a generator in order to produce electricity. Common heat sources used to heat the water within the boiler are coal, lignite (brown coal), fuel oil, natural gas, oil shale and nuclear reactors. In general, these systems are scalable although the extent of scalability is driven in large part by the fuel. For example, it is easier to scale a coal-fired boiler than it is to scale a boiler utilizing nuclear energy. As the temperature, pressure and quantity of steam is varied, other aspects of the system are typically scaled as well. For example, the need for pre-heaters and super-heaters depends, in part, on the size of the system. Additionally, turbine complexity varies with power plant size, ranging from small power generation systems utilizing only a single turbine to large power generation systems utilizing a series of interconnected turbines that include high pressure, intermediate pressure and low pressure turbines.
Although steam-electric power plants are well known, the current systems exhibit one or more problems. First, as previously noted, the extent of scalability varies, thus making certain power plants unusable or overly inefficient for certain applications (e.g., using a nuclear steam-electric power plant to provide power to a small community). Second, all current steam-electric power plants generate considerable environmental waste. For example, all fossil fuel based systems generate carbon dioxide, a major contributor to global warming. Fission-based nuclear reactors, while not generating carbon dioxide, produce large quantities of radioactive waste, typically on the order of 20 to 30 tons per year, which can remain toxic for hundreds of thousands of years. In addition to the problems of radioactive waste containment, removal and storage, this form of waste also adds a high degree of risk to the operation of such a power plant, both to local residents and those living hundreds of miles away. For example, the accident that occurred at Chernobyl in the Ukraine increased the radiation levels in Scotland to over 10,000 times the norm. Additionally, some nuclear reactor waste can be used to produce nuclear weapons (i.e., bombs), thus adding the cost of security to the operating costs of the power plant.
In addition to the environmental and safety issues associated with current steam-electric power plants, these systems can also lead to increased vulnerability to potential supply disruption, whether the supply is a fossil fuel such as coal or a nuclear fuel such as uranium. Additionally, obtaining such fuels, for example by mining, can have significant adverse effects on the ecosystem in the area in which the fuel is mined and processed.
Accordingly, what is needed is a steam-electric power plant that is scalable and environmentally friendly. The present invention provides such a system.
SUMMARY OF THE INVENTIONThe present invention provides a power generating system and a method of operating the same, the system utilizing an electrolytic heating subsystem. The electrolytic heating subsystem is a pulsed electrolysis system that heats a working fluid contained within a circulation conduit in thermal communication with an electrolysis tank of the electrolytic heating subsystem. As the working fluid is circulated through the circulation conduit, it is heated to a temperature above its boiling point, causing at least a portion of the working fluid to be converted to vapor (e.g., steam). The vapor is then circulated through a steam turbine, causing its rotation and, in turn, an electric generator coupled to the steam turbine.
In one embodiment of the invention, the power generating system includes an electrolytic heating subsystem comprised of an electrolysis tank, a membrane separating the electrolysis tank into two regions, at least one pair of low voltage electrodes, at least one pair of high voltage electrodes, a low voltage source, a high voltage source, and means for simultaneously pulsing both the low voltage source and the high voltage source. The system is further comprised of a circulation conduit containing a working fluid, at least a portion of the circulation conduit being in thermal communication with the electrolytic heating subsystem, for example by surrounding a portion of the electrolysis tank or being integrated within the electrolysis tank or being integrated within the walls of the electrolysis tank. Upon heating, the working fluid within the circulation conduit is converted to vapor (e.g., steam). The vapor is circulated through a steam turbine that is coupled to a generator. The system can also include a condenser for condensing the vapor after it passes through the steam turbine. The system can also include a circulation pump. The circulation conduit can be comprised of stages which are serially coupled to the electrolytic heating subsystem or to multiple electrolytic heating subsystems. The system can also include a separator. The system can also include one or more of a variety of sensors (e.g., electrolysis medium temperature monitor(s), working fluid temperature monitor(s), electrolysis medium level sensors, electrolysis medium pH sensors, electrolysis medium resistivity sensors, etc.). The system can also include a system controller that can be coupled to the electrolytic heating subsystem (e.g., the low and/or high voltage sources, the pulsing means, etc.), and/or a circulation pump, and/or the system sensors. The system can further be comprised of at least one electromagnetic coil capable of generating a magnetic field within a portion of the electrolysis tank. The system can further be comprised of at least one permanent magnet capable of generating a magnetic field within a portion of the electrolysis tank.
In one embodiment of the invention, the power generating system includes an electrolytic heating subsystem comprised of an electrolysis tank, a membrane separating the electrolysis tank into two regions, at least one pair of high voltage electrodes, a plurality of metal members contained within the electrolysis tank and interposed between the high voltage electrodes and the membrane, a high voltage source, and means for pulsing the high voltage source. The system is further comprised of a circulation conduit containing a working fluid, at least a portion of the circulation conduit being in thermal communication with the electrolytic heating subsystem, for example by surrounding a portion of the electrolysis tank or being integrated within the electrolysis tank or being integrated within the walls of the electrolysis tank. Upon heating, the working fluid within the circulation conduit is converted to vapor (e.g., steam). The vapor is circulated through a steam turbine that is coupled to a generator. The system can also include a condenser for condensing the vapor after it passes through the steam turbine. The system can also include a circulation pump. The circulation conduit can be comprised of stages which are serially coupled to the electrolytic heating subsystem or to multiple electrolytic heating subsystems. The system can also include a separator. The system can also include one or more of a variety of sensors (e.g., electrolysis medium temperature monitor(s), working fluid temperature monitor(s), electrolysis medium level sensors, electrolysis medium pH sensors, electrolysis medium resistivity sensors, etc.). The system can also include a system controller that can be coupled to the electrolytic heating subsystem (e.g., the voltage source, the pulsing means, etc.), and/or a circulation pump(s), and/or the system sensors. The system can further be comprised of at least one electromagnetic coil capable of generating a magnetic field within a portion of the electrolysis tank. The system can further be comprised of at least one permanent magnet capable of generating a magnetic field within a portion of the electrolysis tank.
In another aspect of the invention, a method of generating electricity is provided, the method comprising the steps of performing electrolysis within an electrolysis tank of an electrolytic heating subsystem, heating a working fluid contained within a circulation conduit using the electrolytic heating system, wherein a portion of the circulation conduit is in thermal contact with the electrolysis tank and wherein the working fluid is heated to a temperature above its boiling point thereby generating vapor, circulating the generated vapor through a steam turbine thereby causing the rotation of the steam turbine, and rotating a drive shaft of a generator coupled to the steam turbine thereby causing the generator to generate electricity. In at least one embodiment, the method further comprises the step of passing the vapor through a condenser after it has passed through the steam turbine. In at least one embodiment, the method further comprises the steps of heating the working fluid within a first region of the circulation conduit, separating vapor formed within the first region, and heating the separated vapor within a second region of the circulation conduit, wherein the second region of the circulation conduit may be thermally coupled to the same electrolytic heating subsystem or to a different electrolytic heating subsystem. In at least one embodiment, the method further comprises the steps of periodically measuring the temperature of the electrolytic heating subsystem, comparing the measured temperature with a preset temperature or temperature range, and modifying at least one process parameter of the electrolytic heating subsystem if the measured temperature is outside (lower or higher) of the preset temperature or temperature range. In at least one embodiment, the method further comprises the steps of periodically measuring the temperature of the working fluid, comparing the measured temperature with a preset temperature or temperature range, and modifying at least one process parameter of the electrolytic heating subsystem if the measured temperature is outside (lower or higher) of the preset temperature or temperature range. In at least one embodiment, the step of performing electrolysis further comprises the steps of applying a low voltage to at least one pair of low voltage electrodes contained within the electrolysis tank of the electrolytic heating subsystem and applying a high voltage to at least one pair of high voltage electrodes contained within the electrolysis tank, wherein the low voltage and the high voltage are simultaneously pulsed. In at least one embodiment, the step of performing electrolysis further comprises the steps of applying a high voltage to at least one pair of high voltage electrodes contained within the electrolysis tank, the high voltage applying step further comprising the step of pulsing said high voltage, wherein at least one metal member is positioned between the high voltage anode(s) and the tank membrane and at least one other metal member is positioned between the high voltage cathode(s) and the tank membrane. In at least one embodiment, the method further comprises the step of generating a magnetic field within a portion of the electrolysis tank, wherein the magnetic field affects a heating rate corresponding to the electrolytic heating subsystem.
A further understanding of the nature and advantages of the present invention may be realized by reference to the remaining portions of the specification and the drawings.
During operation, electrolytic heating subsystem 103 becomes very hot, the temperature dependent on the operating conditions of subsystem 103 (e.g., on/off cycling time, electrode size, input power, input frequency and pulse duration, etc.). Typically subsystem 103, and more specifically fluid 105 within subsystem 103, is maintained during operation at a relatively high temperature, typically on the order of at least 150°-250° C., more preferably on the order of 250°-350° C., and still more preferably on the order of 350°-500° C. It some embodiments, the system is maintained at even higher temperatures.
Coupling pulsed electrolytic heating subsystem 103 to electric power generation subsystem 101 is a conduit 107. It will be appreciated that although conduit 107 is referred to herein as a single conduit, in practice it can be comprised of multiple conduits coupled together, the individual conduits being of either a similar or dissimilar construction. A portion of conduit 107 is contained within electrolysis tank 109, or mounted around electrolysis tank 109, or integrated within the walls of electrolysis tank 109. The primary considerations for the location of conduit 107 relative to tank 109 are (i) the efficiency of the thermal communication between the electrolytic heating subsystem and the conduit (and the working fluid contained therein) and (ii) minimization of conduit erosion. As most materials used for the electrolysis tank are poor thermal conductors, typically conduit 107 is either contained within the tank or integrated within the tank walls. Preferably tank 109 and conduit 107 are all designed to operate at high pressures, thus allowing the desired temperatures to be reached while maintaining electrolysis fluid 105 in a fluid state.
During electrolysis, the heat generated by the process heats electrolysis fluid 105 which, in turn, heats conduit 107 and the working fluid contained within conduit 107. Preferably the working fluid within conduit 107 is water although other materials such as an organic fluid can also be used. The working fluid is heated to a temperature above its boiling point, thereby creating vapor (e.g., steam). The vapor is circulated through a turbine 111, turbine 111 being either a single-stage or a multi-stage turbine. Although turbine 119 can be coupled to a variety of devices, thereby utilizing the rotary motion of the turbine to perform mechanical work, preferably turbine 111 is coupled to an electric generator 113, for example via direct linkage between the shaft of the turbine and the drive shaft of the generator.
After the working fluid passes through turbine 111 it is cooled and condensed within a condenser 115. Preferably the working fluid is continually cycled through the steam process via circulation pump 117. Pump 117 can be a single speed or a multi-speed pump and, in at least one embodiment, is used in conjunction with a control valve 119. Control valve 119 can be a variable flow valve or other type of valve. Pump 117, alone or in combination with valve 119, controls the flow of working fluid through conduit 107.
In a preferred embodiment of the invention, a system controller 121 controls the performance of the system by varying one or more operating parameters (i.e., process parameters) of electrolytic heating subsystem 103 to which it is attached via power supply 123. Varying operating parameters of power supply 123 and thus subsystem 103, for example cycling the subsystem on and off or varying other operational parameters as described further below, allows the subsystem to be operated at the desired temperature. Preferably at least one temperature monitor 125, coupled to subsystem 103, allows controller 121 to obtain feedback from the system as the operational parameters are varied. Preferably in addition to monitoring the temperature of subsystem 103, the temperature is monitored throughout system 100 thus allowing system operation to be monitored and optimized. For example, preferably the temperature of the working fluid within conduit 107 is measured and monitored by system controller 121 both as it exits and then re-enters electrolytic heating subsystem 103, for example using a pair of temperature monitors 127 and 129, respectively. Additionally, in at least one preferred embodiment, the circulation pump (e.g., pump 117) and the control valve (e.g., flow valve 119) are also coupled to, and controlled by, controller 121. It will be appreciated that the system may also utilize other system monitors thus allowing complete system performance to be monitored and optimized. Exemplary parameters that can be monitored to provide system performance information include turbine rotation speed, steam temperature and pressure, generator output, etc.
It is often desirable to heat the working fluid in stages, this approach typically allowing improved optimization. In at least one preferred embodiment, the working fluid undergoes two heating stages; vaporization and superheating. After conclusion of the vaporization stage, only the vapor is removed and sent on to the superheating stage during which additional heat can be added to the saturated vapor.
Multi-stage heating systems can also be used with multiple electrolytic heating subsystems as shown in the exemplary embodiment of
Particulars of the electrolytic heating subsystem will now be provided. It will be appreciated that the following configurations can be used for systems utilizing a single electrolytic heating subsystem as shown in
Tank 109 is comprised of a non-conductive material and, as with conduit 107 and all fittings and couplings associated with the tank or with the conduit, are designed to accommodate the operational pressures of the system. The size of tank 109 is primarily selected on the basis of the desired system output, i.e., the desired operating temperature and the expected heat load. Although tank 109 is shown as having a rectangular shape, it will be appreciated that the invention is not so limited and that tank 109 can utilize other shapes, for example cylindrical, square, irregularly-shaped, etc. Tank 109 is substantially filled with medium 105. In at least one preferred embodiment, liquid 105 is comprised of water, or more preferably water with an electrolyte, the electrolyte being an acid electrolyte, a base electrolyte, or a combination of an acid electrolyte and a base electrolyte. Exemplary electrolytes include potassium hydroxide and sodium hydroxide. The term “water” as used herein refers to water (H2O), deuterated water (deuterium oxide or D2O), tritiated water (tritium oxide or T2O), semiheavy water (HDO), heavy oxygen water (H218O or H217O) or any other water containing an isotope of either hydrogen or oxygen, either singly or in any combination thereof (for example, a combination of H2O and D2O).
A typical electrolysis system used to decompose water into hydrogen and oxygen gases utilizes relatively high concentrations of electrolyte. Subsystem 103, however, has been found to work best with relatively low electrolyte concentrations, thereby maintaining a relatively high initial water resistivity. Preferably the water resistivity prior to the addition of an electrolyte is on the order of 1 to 28 megohms. Preferably the concentration of electrolyte is in the range of 0.05 percent to 10 percent by weight, more preferably the concentration of electrolyte is in the range of 0.05 percent to 2.0 percent by weight, and still more preferably the concentration of electrolyte is in the range of 0.1 percent to 0.5 percent by weight.
Separating tank 109 into two regions is a membrane 401. Membrane 401 permits ion/electron exchange between the two regions of tank 109. Assuming medium 105 is water, as preferred, small amounts of hydrogen and oxygen are produced during operation. Accordingly membrane 401 also keeps the oxygen and hydrogen bubbles produced during electrolysis separate, thus minimizing the risk of inadvertent recombination of the two gases. Exemplary materials for membrane 401 include, but are not limited to, polypropylene, tetrafluoroethylene, asbestos, etc. Preferably tank 109 also includes a pair of gas outlets 403 and 405, corresponding to the two regions of tank 109. The volume of gases produced by the process can either be released, through outlets 403 and 405, into the atmosphere in a controlled manner or they can be collected and used for other purposes.
As previously noted, since the electrolytic heating subsystem is designed to reach relatively high temperatures, the materials comprising tank 109, membrane 401 and other subsystem components are selected on the basis of their ability to withstand the expected temperatures and pressures. As previously noted, the subsystem is intended to operate at relatively high temperatures, typically at least 150°-250° C., more preferably on the order of 250°-350° C., and still more preferably on the order of 350°-500° C. Accordingly, it will be understood that the choice of materials for the subsystem components and the design of the subsystem (e.g., tank wall thicknesses, fittings, etc.) will vary, depending upon the intended subsystem operational parameters, primarily temperature and pressure.
Replenishment of medium 105 can be through one or more dedicated lines.
In at least one embodiment of the electrolytic heating subsystem, two types of electrodes are used, each type of electrode being comprised of one or more electrode pairs with each electrode pair including at least one cathode (i.e., a cathode coupled electrode) and at least one anode (i.e., an anode coupled electrode). All cathodes, regardless of the type, are kept in one region of tank 109 while all anodes, regardless of the type, are kept in the other tank region, the two tank regions separated by membrane 401. In the embodiment illustrated in
The first type of electrodes, electrodes 419/421, are coupled to a low voltage source 423. The second type of electrodes, electrodes 425/427, are coupled to a high voltage source 429. In the illustrations and as used herein, voltage source 423 is labeled as a ‘low’ voltage source not because of the absolute voltage produced by the source, but because the output of voltage source 423 is maintained at a lower output voltage than the output of voltage source 429. Preferably and as shown, the individual electrodes of each pair of electrodes are parallel to one another; i.e., the face of electrode 419 is parallel to the face of electrode 421 and the face of electrode 425 is parallel to the face of electrode 427. It should be appreciated, however, that such an electrode orientation is not required.
In one preferred embodiment, electrodes 419/421 and electrodes 425/427 are comprised of titanium. In another preferred embodiment, electrodes 419/421 and electrodes 425/427 are comprised of stainless steel. It should be appreciated, however, that other materials can be used and that the same material does not have to be used for both the low and high voltage electrodes. Additionally, the same material does not have to be used for both the anode(s) and the cathode(s) of the low voltage electrodes, nor does the same material have to be used for both the anode(s) and the cathode(s) of the high voltage electrodes. In addition to titanium and stainless steel, other exemplary materials that can be used for the low voltage and high voltage electrodes include, but are not limited to, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, metal hydrides and alloys of these materials. Preferably the surface area of the faces of the low voltage electrodes (e.g., electrode 419 and electrode 421) cover a large percentage of the cross-sectional area of tank 109, typically on the order of at least 40 percent of the cross-sectional area of tank 109, and more typically between approximately 70 percent and 90 percent of the cross-sectional area of tank 109. Preferably the separation between the low voltage electrodes (e.g., electrodes 419 and 421) is between 0.1 millimeters and 15 centimeters. In at least one embodiment the separation between the low voltage electrodes is between 0.1 millimeters and 1 millimeter. In at least one other embodiment the separation between the low voltage electrodes is between 1 millimeter and 5 millimeters. In at least one other embodiment the separation between the low voltage electrodes is between 5 millimeters and 2 centimeters. In at least one other embodiment the separation between the low voltage electrodes is between 5 centimeters and 8 centimeters. In at least one other embodiment the separation between the low voltage electrodes is between 10 centimeters and 12 centimeters.
In the illustrated embodiment, electrodes 425/427 are positioned outside of the planes containing electrodes 419/421. In other words, the separation distance between electrodes 425 and 427 is greater than the separation distance between electrodes 419 and 421 and both low voltage electrodes are positioned between the planes containing the high voltage electrodes. The high voltage electrodes may be larger, smaller or the same size as the low voltage electrodes.
As previously noted, the voltage applied to the high voltage electrodes is greater than that applied to the low voltage electrodes. Preferably the ratio of the high voltage to the low voltage applied to the high voltage and low voltage electrodes, respectively, is at least 5:1, more preferably the ratio is between 5:1 and 100:1, still more preferably the ratio is between 5:1 and 33:1, and even still more preferably the ratio is between 5:1 and 20:1. Preferably the high voltage generated by source 429 is within the range of 50 volts to 50 kilovolts, more preferably within the range of 100 volts to 5 kilovolts, and still more preferably within the range of 500 volts to 2.5 kilovolts. Preferably the low voltage generated by source 423 is within the range of 3 volts to 1500 volts, more preferably within the range of 12 volts to 750 volts, still more preferably within the range of 24 volts to 500 volts, and yet still more preferably within the range of 48 volts to 250 volts.
Rather than continually apply voltage to the electrodes, sources 423 and 429 are pulsed, preferably at a frequency of between 50 Hz and 1 MHz, more preferably at a frequency of between 100 Hz and 10 kHz, and still more preferably at a frequency of between 150 Hz and 7 kHz. The pulse width (i.e., pulse duration) is preferably between 0.01 and 75 percent of the time period defined by the frequency, and more preferably between 0.1 and 50 percent of the time period defined by the frequency, and still more preferably between 0.1 and 25 percent of the time period defined by the frequency. Thus, for example, for a frequency of 150 Hz, the pulse duration is preferably in the range of 0.67 microseconds to 5 milliseconds, more preferably in the range of 6.67 microseconds to 3.3 milliseconds, and still more preferably in the range of 6.67 microseconds to 1.7 milliseconds. Alternately, for example, for a frequency of 1 kHz, the pulse duration is preferably in the range of 0.1 microseconds to 0.75 milliseconds, more preferably in the range of 1 microsecond to 0.5 milliseconds, and still more preferably in the range of 1 microsecond to 0.25 milliseconds. Additionally, the voltage pulses are applied simultaneously to the high voltage and low voltage electrodes via sources 423 and 429, respectively. In other words, the voltage pulses applied to high voltage electrodes 425/427 coincide with the pulses applied to low voltage electrodes 419/421. Although voltage sources 423 and 429 can include internal means for pulsing the respective outputs from each source, preferably an external pulse generator 431 controls a pair of switches, i.e., low voltage switch 433 and high voltage switch 435 which, in turn, control the output of voltage sources 423 and 429 as shown, and as described above.
In at least one preferred embodiment, the frequency and/or pulse duration and/or low voltage and/or high voltage can be changed by system controller 121 during system operation, thus allowing the operation of the electrolytic heating subsystem to be controlled. For example, in the configuration shown in
As will be appreciated by those of skill in the art, there are numerous minor variations of the electrolytic heating subsystem described above and shown in
In an exemplary embodiment of the electrolytic heating subsystem, a cylindrical chamber measuring 125 centimeters long with an inside diameter of 44 centimeters and an outside diameter of 50 centimeters was used. The tank contained 175 liters of water, the water including a potassium hydroxide (KOH) electrolyte at a concentration of 0.1% by weight. The low voltage electrodes were 75 centimeters by 30 centimeters by 0.5 centimeters and had a separation distance of approximately 10 centimeters. The high voltage electrodes were 3 centimeters by 2.5 centimeters by 0.5 centimeters and had a separation distance of approximately 32 centimeters. Both sets of electrodes were comprised of titanium. The pulse frequency was maintained at 150 Hz and the pulse duration was initially set to 260 microseconds and gradually lowered to 180 microseconds during the course of a 4 hour run. The low voltage supply was set to 50 volts, drawing a current of between 5.5 and 7.65 amps, and the high voltage supply was set to 910 volts, drawing a current of between 2.15 and 2.48 amps. The initial temperature was 28° C. and monitored continuously with a pair of thermocouples, one in each side of the tank. After conclusion of the 4 hour run, the temperature of the tank fluid had increased to 67° C.
Illustrating the correlation between electrode size and heat production efficiency, the high voltage electrodes of the previous test were replaced with larger electrodes, the larger electrodes measuring 9.5 centimeters by 5 centimeters by 0.5 centimeters, thus providing approximately 6.3 times the surface area of the previous high voltage electrodes. The larger electrodes, still operating at a voltage of 910 volts, drew a current of between 1.73 and 1.9 amps. The low voltage supply was again set at 50 volts, in this run the low voltage electrodes drawing between 0.6 and 1.25 amps. Although the pulse frequency was still maintained at 150 Hz, the pulse duration was lowered from an initial setting of 60 microseconds to 15 microseconds. All other operating parameters were the same as in the previous test. In this test, during the course of a 5 hour run, the temperature of the tank fluid increased from 28° C. to 69° C. Given the shorter pulses and the lower current, this test with the larger high voltage electrodes exhibited a heat production efficiency approximately 8 times that exhibited in the previous test.
In a test of the exemplary embodiment of the electrolytic heating subsystem using metal members in place of low voltage electrodes, the same cylindrical chamber and electrolyte-containing water was used as in the previous test. The metal members were 75 centimeters by 30 centimeters by 0.5 centimeters and had a separation distance of approximately 10 centimeters. The high voltage electrodes were 3 centimeters by 2.5 centimeters by 0.5 centimeters and had a separation distance of approximately 32 centimeters. The high voltage electrodes and the metal members were fabricated from stainless steel. The pulse frequency was maintained at 150 Hz and the pulse duration was initially set to 250 microseconds and gradually lowered to 200 microseconds during the course of a 2 hour run. The high voltage supply was set to 910 volts, drawing a current of between 2.21 and 2.45 amps. The initial temperature was 30° C. and monitored continuously with a pair of thermocouples, one in each side of the tank. After conclusion of the 2 hour run, the temperature of the tank fluid had increased to 60° C.
As with the previously described set of tests, the correlation between electrode size and heat production efficiency was demonstrated by replacing the high voltage electrodes with larger electrodes measuring 9.5 centimeters by 5 centimeters by 0.5 centimeters. The larger electrodes, still operating at a voltage of 910 volts, drew a current of between 1.6 and 1.94 amps. The pulse frequency was still maintained at 150 Hz, however, the pulse duration was lowered from an initial setting of 90 microseconds to 25 microseconds. All other operating parameters were the same as in the previous test. In this test during the course of a 6 hour run, the temperature of the tank fluid increased from 23° C. to 68° C., providing an increase in heat production efficiency of approximately 3 times over that exhibited in the previous test.
As with the previous exemplary embodiment, it will be appreciated that there are numerous minor variations of the electrolytic heating subsystem described above and shown in
Exemplary alternate electrode/metal member configurations include, but are not limited to, multiple sets of metal members, multiple high voltage cathodes, multiple high voltage anodes, multiple sets of metal members combined with multiple high voltage cathodes and anodes, electrodes/metal members of varying size or shape (e.g., cylindrical, curved, etc.), and electrodes/metal members of varying orientation (e.g., non-parallel faces, pairs in which individual electrodes are not positioned directly across from one another, etc.). Additionally, alternate configurations can utilize a variety of input powers, pulse frequencies and pulse durations.
In at least one preferred embodiment of the invention, the electrolytic heating subsystem uses a reaction rate controller to help achieve optimal performance of the heating subsystem(s). The rate controller operates by generating a magnetic field within the electrolysis tank, either within the region between the high voltage cathode(s) and the low voltage cathode(s) or metal member(s), or within the region between the high voltage anode(s) and the low voltage anode(s) or metal member(s), or both regions. The magnetic field can either be generated with an electromagnetic coil or coils, or with one or more permanent magnets. The benefit of using electromagnetic coils is that the intensity of the magnetic field generated by the coil or coils can be varied by controlling the current supplied to the coil(s), thus providing a convenient method of controlling the reaction rate.
In the electrolytic heating subsystem illustrated in
Although the subsystem embodiment shown in
The magnetic field rate controller is not limited to use with electrolytic heating subsystems employing both low and high voltage electrodes. For example, the electromagnetic rate controller subsystem can be used with embodiments using high voltage electrodes and metal members as described above and shown in the exemplary embodiment of
As previously noted, although electromagnetic coils provide a convenient means for controlling the intensity of the magnetic field applied to the reactor, permanent magnets can also be used with the electrolytic heating subsystem of the invention, for example when the magnetic field does not need to be variable.
In at least one mode of operation, the system controller is configured to adjust the operating parameters of the electrolytic heating subsystem during operation, for example based on the temperature of the electrolysis medium or the temperature of the working fluid. This type of control can be used, for example, to insure that the temperature of the electrolytic heating subsystem remains within a preset range, even if the system output varies with age. Typically this type of process modification occurs periodically; for example the system can be configured to execute a system performance self-check every 30 minutes or at some other time interval.
As will be understood by those familiar with the art, the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the disclosures and descriptions herein are intended to be illustrative, but not limiting, of the scope of the invention which is set forth in the following claims.
Claims
1. A power generating system comprising:
- an electrolytic heating subsystem comprising: an electrolysis tank; a liquid within said electrolysis tank, wherein said liquid includes at least one of water, deuterated water, tritiated water, semiheavy water, heavy oxygen water, water containing an isotope of hydrogen, and water containing an isotope of oxygen; a membrane separating said electrolysis tank into a first region and a second region; at least one pair of low voltage electrodes contained within said electrolysis tank, wherein each pair of said at least one pair of low voltage electrodes includes an anode and a cathode; at least one pair of high voltage electrodes contained within said electrolysis tank, wherein each pair of said at least one pair of high voltage electrodes includes an anode and a cathode, wherein said anodes of said at least one pair of low voltage electrodes and said anodes of said at least one pair of high voltage electrodes are contained within said first region, wherein said cathodes of said at least one pair of low voltage electrodes and said cathodes of said at least one pair of high voltage electrodes are contained within said second region, and wherein a first separation distance corresponding to the distance between the electrodes of each pair of high voltage electrodes is greater than a second separation distance corresponding to the distance between the electrodes of each pair of low voltage electrodes;
- a low voltage source with a first output voltage electrically connected to said at least one pair of low voltage electrodes;
- a high voltage source with a second output voltage electrically connected to said at least one pair of high voltage electrodes, wherein said second output voltage is higher than said first output voltage; and
- a pulse generator coupled to said low voltage source and to said high voltage source, wherein said pulse generator simultaneously pulses both said low voltage source and said high voltage source voltage at a specific frequency and with a specific pulse duration;
- a circulation conduit containing a working fluid, wherein a portion of said circulation conduit is in thermal communication with said electrolytic heating subsystem;
- a steam turbine coupled to said circulation conduit, wherein vapor formed from said working fluid and contained within said circulation conduit passes through said steam turbine; and
- an electric generator coupled to said steam turbine.
2. The power generating system of claim 1, further comprising a condenser coupled to said circulation conduit, wherein said vapor passing through said steam turbine is cooled and condensed within said condenser.
3. The power generating system of claim 1, further comprising a separator coupled to said circulation conduit and interposed between a first region of said portion of said circulation conduit and a second region of said portion of said circulation conduit.
4. The power generating system of claim 1, further comprising a second electrolytic heating subsystem, wherein a second portion of said circulation conduit is in thermal communication with said second electrolytic heating subsystem.
5. The power generating system of claim 1, further comprising a circulation pump coupled to said circulation conduit, wherein said circulation pump circulates said working fluid through said circulation conduit.
6. The power generating system of claim 1, further comprising a system controller coupled to said electrolytic heating subsystem, wherein said system controller is coupled to at least one of said low voltage source, said high voltage source, and said pulse generator.
7. The power generating system of claim 1, wherein each low voltage cathode is comprised of a first material, wherein each low voltage anode is comprised of a second material, wherein each high voltage cathode is comprised of a third material, wherein each high voltage anode is comprised of a fourth material, and wherein said first, second, third and fourth materials are selected from the group consisting of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides and alloys of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides.
8. The power generating system of claim 1, further comprising an electromagnetic rate controller subsystem, said electromagnetic rate controller subsystem comprising:
- at least one electromagnetic coil, said at least one electromagnetic coil generating a controllable magnetic field within a portion of said electrolysis tank; and
- means for controlling magnetic field intensity of said magnetic field, wherein said controlling means is coupled to said at least one electromagnetic coil.
9. The power generating system of claim 1, further comprising at least one permanent magnet, said at least one permanent magnet generating a magnetic field within a portion of said electrolysis tank.
10. A power generating system comprising:
- an electrolytic heating subsystem comprising: an electrolysis tank; a liquid within said electrolysis tank, wherein said liquid includes at least one of water, deuterated water, tritiated water, semiheavy water, heavy oxygen water, water containing an isotope of hydrogen, and water containing an isotope of oxygen; a membrane separating said electrolysis tank into a first region and a second region; at least one pair of high voltage electrodes contained within said electrolysis tank, wherein each pair of said at least one pair of high voltage electrodes includes an anode and a cathode, wherein said anodes of said at least one pair of high voltage electrodes are contained within said first region, and wherein said cathodes of said at least one pair of high voltage electrodes are contained within said second region; a plurality of metal members contained within said electrolysis tank, wherein at least a first metal member of said plurality of metal members is contained within said first region and interposed between said anodes of said at least one pair of high voltage electrodes and said membrane, and wherein at least a second metal member of said plurality of metal members is contained within said second region and interposed between said cathodes of said at least one pair of high voltage electrodes and said membrane; a high voltage source with an output voltage electrically connected to said at least one pair of high voltage electrodes; and a pulse generator coupled to said high voltage source, wherein said pulse generator pulses said high voltage source voltage at a specific frequency and with a specific pulse duration;
- a circulation conduit containing a working fluid, wherein a portion of said circulation conduit is in thermal communication with said electrolytic heating subsystem;
- a steam turbine coupled to said circulation conduit, wherein vapor formed from said working fluid and contained within said circulation conduit passes through said steam turbine; and
- an electric generator coupled to said steam turbine.
11. The power generating system of claim 10, further comprising a condenser coupled to said circulation conduit, wherein said vapor passing through said steam turbine is cooled and condensed within said condenser.
12. The power generating system of claim 10, further comprising a separator coupled to said circulation conduit and interposed between a first region of said portion of said circulation conduit and a second region of said portion of said circulation conduit.
13. The power generating system of claim 10, further comprising a second electrolytic heating subsystem, wherein a second portion of said circulation conduit is in thermal communication with said second electrolytic heating subsystem.
14. The power generating system of claim 10, further comprising a circulation pump coupled to said circulation conduit, wherein said circulation pump circulates said working fluid through said circulation conduit.
15. The power generating system of claim 10, further comprising a system controller coupled to said electrolytic heating subsystem, wherein said system controller is coupled to at least one of said high voltage source and said pulse generator.
16. The power generating system of claim 10, wherein each high voltage cathode is comprised of a first material, wherein each high voltage anode is comprised of a second material, wherein each metal member of said plurality of metal members is comprised of a third material, and wherein said first, second and third materials are selected from the group consisting of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides and alloys of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides.
17. The power generating system of claim 10, further comprising an electromagnetic rate controller subsystem, said electromagnetic rate controller subsystem comprising:
- at least one electromagnetic coil, said at least one electromagnetic coil generating a controllable magnetic field within a portion of said electrolysis tank; and
- means for controlling magnetic field intensity of said magnetic field, wherein said controlling means is coupled to said at least one electromagnetic coil.
18. The power generating system of claim 10, further comprising at least one permanent magnet, said at least one permanent magnet generating a magnetic field within a portion of said electrolysis tank.
19. A method of generating electricity, the method comprising the steps of:
- performing electrolysis within an electrolysis tank of an electrolytic heating subsystem;
- heating a working fluid contained within a circulation conduit using said electrolytic heating subsystem, wherein said heating step further comprises the step of generating vapor as said working fluid is heated above the boiling point of the working fluid, and wherein at least a portion of said circulation conduit is in thermal communication with said electrolysis tank of said electrolytic heating subsystem;
- circulating said vapor through a steam turbine, wherein said vapor circulating step causes rotation of said steam turbine; and
- rotating a drive shaft of a generator, wherein said drive shaft is coupled to said steam turbine, and wherein said drive shaft rotating step causes said generator to generate electricity.
20. The method of claim 19, wherein said electrolysis performing step further comprises the steps of:
- periodically measuring a temperature corresponding to said electrolytic heating subsystem;
- comparing said measured temperature with a preset temperature; and
- modifying at least one process parameter of said electrolytic heating subsystem when said measured temperature is above or below said preset temperature by more than a preset quantity.
21. The method of claim 19, wherein said electrolysis performing step further comprises the steps of:
- periodically measuring a temperature corresponding to said working fluid within a region of said circulation conduit;
- comparing said measured temperature with a preset temperature; and
- modifying at least one process parameter of said electrolytic heating subsystem when said measured temperature is above or below said preset temperature by more than a preset quantity.
22. The method of claim 19, said electrolysis performing step further comprising the steps of:
- applying a low voltage to at least one pair of low voltage electrodes contained within said electrolysis tank of said electrolytic heating subsystem, said at least one pair of low voltage electrodes fabricated from a first material, wherein said low voltage applying step further comprises the step of pulsing said low voltage at a first frequency and with a first pulse duration;
- applying a high voltage to at least one pair of high voltage electrodes contained within said electrolysis tank, said at least one pair of high voltage electrodes fabricated from a second material, wherein said high voltage applying step further comprises the step of pulsing said high voltage at said first frequency and with said first pulse duration, wherein said high voltage pulsing step is performed simultaneously with said low voltage pulsing step, and wherein said low voltage electrodes of said at least one pair of low voltage electrodes are positioned between said high voltage electrodes of said at least one pair of high voltage electrodes; and
- selecting said first material and said second material from the group consisting of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides and alloys of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides.
23. The method of claim 22, further comprising the step of generating a magnetic field within a portion of said electrolysis tank, wherein said magnetic field affects a heating rate corresponding to said heat transfer medium heating step.
24. The method of claim 19, said electrolysis performing step further comprising the steps of applying a high voltage to at least one pair of high voltage electrodes contained within said electrolysis tank, said at least one pair of high voltage electrodes fabricated from a first material, wherein said high voltage applying step further comprises the step of pulsing said high voltage at a first frequency and with a first pulse duration, wherein each pair of said at least one pair of high voltage electrodes includes at least one high voltage cathode electrode and at least one high voltage anode electrode, wherein each high voltage cathode electrode is positioned within a first region of said electrolysis tank and each high voltage anode electrode is positioned within a second region of said electrolysis tank, wherein at least a first metal member of a plurality of metal members fabricated from a second material is located within said first region of said electrolysis tank between said high voltage cathode electrodes and a membrane located within said electrolysis tank, and wherein at least a second metal member of said plurality of metal members is located within said second region of said electrolysis tank between said high voltage anode electrodes and said membrane, and further comprising the step of selecting said first material and said second material from the group consisting of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides and alloys of titanium, stainless steel, copper, iron, steel, cobalt, manganese, zinc, nickel, platinum, palladium, aluminum, lithium, magnesium, boron, carbon, graphite, carbon-graphite, and metal hydrides.
25. The method of claim 24, further comprising the step of generating a magnetic field within a portion of said electrolysis tank, wherein said magnetic field affects a heating rate corresponding to said heat transfer medium heating step.
Type: Application
Filed: Nov 13, 2008
Publication Date: Sep 10, 2009
Inventor: Nehemia Davidson (Rosh-Haayin)
Application Number: 12/291,811
International Classification: F01D 15/10 (20060101); F01K 15/00 (20060101); F01K 13/00 (20060101);