Abstract: In a method and apparatus for controlling total ignition delay time in a pulse combustor, and thus controlling the mixing characteristics of the combustion reactants and the combustion products in the combustor, the total ignition delay time is controlled by adjusting the inlet geometry of the inlet to the combustion chamber. The inlet geometry may be fixed or variable for controlling the mixing characteristics. A feedback loop may be employed to sense actual combustion characteristics, and, in response to the sensed combustion characteristics, the inlet geometry may be varied to obtain the total ignition delay time necessary to achieve the desired combustion characteristics. Various embodiments relate to the varying of the mass flow rate of reactants while holding the radius/velocity ratio constant.

Abstract: A device for preheating fuel for an ultrasonic atomizer (11) is shown, in which the fuel for an engine-independent heater operated with liquid fuel is atomized. The heating element (20), which preferably consists of a PTC element, is arranged in physical proximity to the ultrasonic atomizer (11) and outside the fuel feed line (17) so that it is switched off as soon as a sufficient amount of heat is generated by the combustion chamber (3), so that the fuel is adequately atomized on the atomizer plate. Reliable possibility of start at low temperatures (down to cA. -40.degree. C.) is thus achieved at low power consumption in the start-up range.

Abstract: In a pulse combustion device including a housing forming therein a combustion chamber, a cylindrical support member joined to the housing to form a mixing chamber in open communication with the combustion chamber, an annular perforated flange member coupled with an opene end of the support member and having a cylindrical portion provided at its center to form a gas passage in communication with the mixing chamber, an air inlet valve assembly mounted within the flange member to allow inward flow of air passing therethrough into the mixing chamber, and a gas inlet valve assembly disposed within the cylindrical portion to allow inward flow of gaseous fuel passing therethrough into the mixing chamber, an annular heat-blocking plate is arranged to oppose an aperature between the mixing chamber and the combustion chamber and mounted on the cylindrical portion of the flange member between the air inlet valve assembly and the aperture to block radiant heat of combustion products applied thereto from the combustion ch

Abstract: It is an object of the present invention to provide a pulse combustion method and a valveless pulse combustor in which the strong sound wave energy and the combustion gas generated by explosions in the combustion chamber are effectively used for drying of a substance with no waste of sound wave energy and heat of the combustion gas.A pulse combustion method according to the present invention is characterized by a step of pushing the sound wave energy and the combustion gas which flow toward the air intake back to the combustion chamber by jetting a compressed gas toward the air intake. By means of this step, the sound wave energy and the combustion gas which were generated at the time of explosion in the combustion chamber and flow toward the air intake are pushed back to the combustion chamber and further to the exhaust pipe by a stream of the compressed gas. This enables the sound wave energy and the combustion gas which have been conventionally wasted to be used for drying of a substance.

Abstract: A hybrid burner system is disclosed which incorporates features of continuous burners and pulse combustion devices. A combustion chamber is fitted with one-way air inlet valves, an orificed or small sized exhaust outlet valve and a pressurized, gas inlet which is externally actuated in a periodic manner to produce combustion pulses during operation. The combustion pulses generate heat, force the products of combustion from the burner chamber and cause combustion air to periodically enter the chamber in a self-aspirating manner. Combustion occurs silently during the entire time the fuel is externally pulsed because of the way a fuel/air mixture is developed in a chamber which is filled with combustion air prior to fuel introduction. A spark plug electrode-stabilizing rod arrangement insures consistent ignition while a flame front is stabilized and propagated.

Abstract: Resonant tubes of a pulse combustor are immersed in a bed of solid particles in a reaction zone to provide indirect heat from the pulsating combustion gases to the solid particles of the bed. The bed is maintained in an agitated state by a gas or vapor flowing through the bed. Reactant materials are introduced into the agitated bed and undergo reaction at enhanced rates resulting from heat transfer coefficients at least about twice as high as those of steady flow combustors and an intense acoustic pressure level propagated from the pulsating combustor into the reaction zone. The apparatus is useful, for example, to steam reform heavy hydrocarbons and to gasify carbonaceous material, including biomass and black liquor to produce combustible gas at relatively low temperatures, with steam being usilized as the bed fluidizing medium. Black liquor gasification, utilizing sodium carbonate as bed solids, results in liquor energy and chemical content recovery without smelt production.

Abstract: A double-combustor type pulsating combustion apparatus has a pair of pulsating combustors. Fuel-supplying valves are respectively provided in fuel-supplying pipes connected to the upstream sides of combustion chambers of the pair of pulsating combustors. A combustion control unit controls to stop only one pulsating combustor and to operate only the other pulsating combustor by closing one fuel-supplying valve corresponding to one pulsating combustor in a combustion range of 1/2 or less of the maximum combustion amount of the double-combustor type pulsating combustion apparatus. The combustion control unit further controls to operate both the pulsating combustors by opening both the fuel-supplying valves in a combustion range exceeding 1/2 of the maximum combustion amount.

Abstract: An ignition control apparatus for a pulse combustor, wherein the number of trials for energization of a spark electrode is calculated and memorized, the memorized number of trials is reset to an initial value or zero after ignition of the fuel-air mixture in a combustion chamber of the combustor has been successfully obtained, a period of time for pre-purge of the combustion chamber is determined in accordance with the memorized number of trials for energization of the spark electrode, and a purge blower for the combustor activated for the determined period of time prior to energization of the spark electrode to change the unburned mixture ratio to a non-combustible ratio on the trial for ignition. In the ignition control apparatus, the presence of flame in the combustion chamber is further detected for a predetermined time, and the purge blower is deactivated when a predetermined number of trials for ignition have been attempted due to lack of the presence of flame in the combustion chamber.

Abstract: A pulse combustion apparatus comprising a metal pipe member, an exhaust chamber, and an insert member. The pipe member has two open ends and its inner diameter is uniform over its entire length. The first open end of the pipe member is closed, and the second open end thereof is connected to the exhaust chamber. The insert member is located within the pipe member such that it and the pipe member define a combustion chamber within the pipe member, close to the first end thereof, and also an exhaust passage connecting the combustion chamber to the exhaust chamber and having a cross section area smaller than that of the combustion chamber. The combustion chamber and the exhaust passage constitute a Helmholtz resonator which realizes pulse combustion of the fuel gas.

Abstract: In a pulse combustion device including a combustion chamber having a cylindrical wall, a forward end wall secured to one end of the cylindrical wall for attachment with a liquid vessel and being formed with an inlet port to be supplied with a mixture of gaseous fuel and air, and a rearward end wall secured to the other end of the cylindrical wall to close the combustion chamber, the cylindrical wall of the combustion chamber is formed with a plurality of circumferentially equally spaced radial exhaust ports which are located respectively in a position displaced from the center of the combustion chamber in an axial direction toward the inlet port, and a plurality of tailpipes are radially inwardly bent at their one ends and secured to the exhaust ports of the combustion chamber.

Abstract: In a liquid heating apparatus of the pulse combustion type, a mounting plate is secured to a side wall of a liquid vessel for supporting thereon an air-fuel mixer head outside the vessel and a combustion chamber inside the vessel, and an inlet pipe is secured at its inner end to a front end wall of the combustion chamber and extended outwardly from the vessel through the mounting plate. The air-fuel mixer head is mounted to an outer end of the inlet pipe at a position spaced from the mounting plate, and the combustion chamber is supported by the inlet pipe at a position spaced from the mounting plate. During pulse combustion, the inlet pipe is cooled by the liquid flowing into the space between the front end wall of the combustion chamber and the mounting plate to protect the mixer head from the heat of high temperature transmitted thereto from the combustion chamber.

Abstract: In a pulse combination device including a housing forming therein a combustion chamber, a cylindrical support member joined to the housing to form a mixing chamber in open communication with the combustion chamber, a perforated end wall member coupled with an open end of the support member to permit inward flow of the air passing therethrough into the mixing chamber, a cylindrical member mounted in the center of the end wall member to form therein a gas passage in open communication with the mixing chamber, an annular plate formed with a plurality of air inlet ports and being secured to annular end surfaces of the end wall member and the cylindrical member, a shroud housing assembly arranged to form therein an air intake chamber in open communication with the inlet ports through the perforated end wall member, and a blower arranged to forcibly supply the air into the air intake chamber, a deflector plate is mounted in place in the mixing chamber to block a reverse flow of combustion products applied thereto f

Abstract: The present invention relates to a pulsating gas fuel light source, utilizing a flexible diaphragm secured within a housing that reciprocates between two positions to generate a pulsating fuel flow thereby providing a lamp which flashes at regular intervals. The pulsating gas fuel light source is suitable for use as a highly visible warning light for construction sites on highways to warn passing traffic.

Abstract: The present invention provides an organic electronic device characterized by comprising a monomolecular or built-up multi-monomolecular layer having an insulating layer and an electroconductive conjugated bonds disposed between a first electrode and both a second and a third electrodes formed on a substrate, said device being operated by applying an voltage between said first electrode and said second electrode or said third electrode as well as between said second electrode and said third electrode, varying the voltage between said first electrode and said second electrode or said third electrode to control the electroconductivity of said electroconductive conjugated bonds via said insulating layer, whereby an electric current flowing across said electroconductive conjugated bonds between said second electrode and said third electrode is controlled, where said monomolecular layer is produced by utilizing the LB method or a chemical adsorption technique.

Abstract: An improved flame holder based tunable pulse combustor, and a processing system employing same. The processing system is for thermal, chemical, and physical processes which employ natural acoustic modes in a processing chamber to enhance the processing. An acoustically resonant processing chamber is provided as the processing vessel. A frequency tunable pulse combustor comprising a flame holder is positioned to excite natural acoustic modes in the processing chamber. Material introduced into the processing chamber is thereby subjected to acoustic pulsations while the material is being processed. The acoustic excitations in the system result in improved moisture removal and particle heating. Also disclosed are various embodiments of frequency and amplitude tunable pulse combustors which may be employed to excite the natural acoustic modes in the processing chamber, including axially translatable acoustic decoupler and flame holder configurations.

Abstract: A steam-producing orchard heater operating on the pulse-jet combustion principle has a horizontal cylindrical combustion chamber with an exhaust tube of smaller diameter extending coaxially from one end thereof, an air supply and ignition tube, extending tangentially from the combustion chamber near the closed end, a fuel supply fitting in the combustion chamber in the same transverse plane as the air supply and ignition tube, and a water injection fitting near the exhaust tube end of the combustion chamber. Two legs are provided under the combustion chamber, and one leg is provided under the exhaust tube.

Abstract: A thermally driven gas resonance device includes a resonance tube (3) which expands in cross-section along its length from one end to the other, a heat source (2) located at the one end of the resonance tube, and an igniter (14) to trigger oscillations in a gas in the tube. The heat source (2) is preferably a pulsed heat source having a repetition frequency corresponding to a resonant frequency of the gas tube (3). The mechanical energy produced in the oscillating gas may be used to operate a pressure swing gas separator by including a bed (16) of molecular sieve material in the other end of the tube (3). Alternatively, the mechanical energy may be used to drive a heat pump (19). In this case a heat sink (21) is located at the other end of the tube (3), a regenerator (20) is also located adjacent the other end, and ports (8) on the side of the regenerator (20) towards the heat source (2) effect heat exchange between the gas in the resonance tube (3) and a source of low grade heat.

Abstract: A furnace is provided for combusting liquid or gaseous fuel which has a combustion assembly with an internal cavity that has a mixing chamber and a combustion chamber. A flame tube is disposed intermediate the mixing chamber and the combustion chamber. The combustion assembly has an outlet which is adapted to exhaust the gases which result from combustion of the air-fuel mixture. An ignitor rod for igniting the air fuel mixture is also provided.

Abstract: A continuously-variable rate pulse combustion apparatus comprising a main burner, a primary burner operably connected to the main burner, main and primary fuel supply lines including valves for self-feeding a combustible gaseous mixture to the main and primary burners, respectively, main and primary air supply lines including valves for providing one-way flow of air to the main and primary burners, a combustion chamber for pulse combustion of the combustible gaseous mixture to provide combustion gases, and an exhaust mechanism for self-exhausting the combustion gases from the combustion chamber. An inlet air decoupler is provided for acoustically decoupling the main and primary air supply lines.

Abstract: A pulse combustion energy system including a pulse combustor coupled to a processing tube for flowing material to be processed therethrough, the processing tube being coupled to a pair of cyclone collectors for receiving the material flowing therefrom. An optional recycling section is coupled to the cyclone collectors for flowing vapor from the cyclone collectors back to the upstream end of the processing tube. The pulse combustor includes a rotary valve, a combustion chamber, an inner tail pipe and an outer tail pipe. The combustion chamber and inner tail pipe are conical and tubular sections mounted in longitudinal compression, and the compressive forces are transmitted externally across the junction of the combustion chamber and tail pipe by a strongback assembly. The rotary valve includes first, second, and third closely adjacent cylinders defining an interior air chamber. The cylinders have radially oriented, substantially aligned apertures which define an air intake.

Abstract: A pulse combustion apparatus comprises (i) a single air supply section with a single air blower and (ii) a plurality of combustion sections each communicating with the air supply section. The air supply section includes passages communicating with both the blower and the respective combustion sections for admitting air from the blower into the respective combustion sections. The air admitting passages are physically separated from each other for separating air from the blower into streams which are not able to join together anywhere.

Abstract: A pulse combustor having a casing defining a combustion chamber and an exhaust region encircling the combustion chamber. A carburetor is coupled to the casing with an injector for injecting a fuel mixture into the combustion chamber in response to a pressure reduction following combustion in the combustion chamber. An ignitor for initially igniting the fuel mixture in the combustion chamber is provided. Following ignition and a rapid increase in pressure and temperature in the combustion chamber a pressure wave expands radially travelling along the exhaust region and then reversing direction in response to subsequent pressure reduction in the combustion chamber. After a fresh fuel mixture has been injected during the low pressure period it is pre-compressed by the pressure wave together with at least some of the hot residue from the previous combustion and then again ignites, repeating the cycle. The casing is cooled to enhance the pressure drop during the pressure reduction stage.

Abstract: A pulse combustion device adapted for use in a liquid heating apparatus. The combustion device includes a combustion chamber having a forward end wall formed with an inlet port to be supplied with a mixture of gaseous fuel and air, an attachment plate unitedly provided with the forward end wall of the combustion chamber for engagement with a liquid vessel of the heating apparatus, a cylindrical decoupler arranged coaxially with the combustion chamber at its rear side, a plurality of tailpipes connected at their one ends to the combustion chamber and at their other ends to a front end of the decoupler, the tailpipes being arranged at their intermediate portions in parallel along the outer circumference of the decoupler, and an exhaust pipe connected at its one end to a rear portion of the decoupler and being extended forwardly along the circumference of the decoupler, said exhaust pipe being further extended forwardly through the attachment plate.

Abstract: A hybrid burner system is disclosed which incorporates features of continuous burners and pulse combustion devices. A combustion chamber is fitted with one-way air inlet valves, a restricted or one-way exhaust outlet valve and a pressurized, gas inlet which is externally actuated in a periodic manner to produce combustion pulses during operation. The combustion pulses generate heat, force the products of combustion from the burner chamber and cause combustion air to periodically enter the chamber in a self-aspirating manner. Combustion occurs silently during the entire time the fuel is externally pulsed. A spark plug electrode - stabilizing rod arrangement insures consistent ignition while a flame front is stabilized and propagated at the rod. The burner arrangement is self-contained in a recirculating heat exchange application where a pulse opening is provided at a precise position relative to the heat combustion chamber.

Abstract: A gas cooking appliance for cooking chow mein, pan cakes or the like on a hot plate mounted thereon, which cooking appliance includes a pulse combustion burner installed within as internal compartment of the appliance and having a combustion chamber coupled with a bottom portion of the hot plate to take place pulse combustion of a mixture of gaseous fuel and air supplied thereinto, wherein the hot plate is in the form of a thick metallic plate formed therein with a tailpipe passage which is connected at one end thereof to an exhaust port of the combustion chamber and extends outwardly through the metallic plate to permit the flow of combustion products discharged therethrough from said combustion chamber.

Abstract: A pulse combustion unit for a liquid heating apparatus having a liquid vessel arranged to store an amount of liquid to be heated. The combustion unit includes a base plate mounted on the upper portion of an upright support structure, a pulse combustion burner assembly including a pulse combustion chamber secured to one surface of the base plate and a curved tailpipe having an inner end connected to an exhaust port of the combustion chamber and an outer end connected to the base plate, and an air-fuel mixer head secured to the other surface of the base plate and being in open communication with the interior of the combustion chamber through an opening of the base plate. The liquid vessel is coupled at its side wall with the base plate in such manner that the combustion chamber and tailpipe are arranged in the vessel.

Abstract: A check-valve mechanism of a pulse combustion apparatus for passing air into a mixing chamber includes (i) a partition wall separating an air inlet chamber and the mixing chamber from each other, (ii) a plurality of rear discs of relatively small diameters spaced apart from the partition wall and located inside the mixing chamber, and (iii) a plurality of front discs, or valve members, located between said partition wall and said rear discs; respectively. The circular portions of the partition wall which overlies the respective valve members (as viewed from the side of the air inlet chamber) each have a plurality of radially-extended elongate openings for passing air into the mixing chamber. Each rear disc has a plurality of small circular openings. Each valve member is axially movable between the partition wall and the associated rear disc, thereby opening and closing the elongate openings.

Abstract: This invention relates to a flapper check valve having a valve housing which has at least one outlet opening. A valve backer plate having a plurality of arcuate backer through holes is positioned generally parallel to a valve port plate having a plurality of arcuate port through holes. The valve port plate and valve backer plate are sealably secured with respect to the valve housing. In an open position of the flapper check valve, the backer through holes are in communication with the port through holes. At least one peripheral spacer/hermetic seal is positioned at a generally peripheral location relative to the valve port plate. Upon combustion within the combustion chamber, the flapper check valve prevents fluid/gas backflow in a direction from the valve backer plate to the valve port plate. At least one flat central spacer is positioned at a generally central location relative to the valve port plate and the valve backer plate.

Abstract: A liquid heating apparatus of the type which includes a liquid vessel assembled within a support frame, a pulse combustion burner mounted to the vessel and having a combustion chamber secured at its inlet end to a side wall of the vessel and immersed in liquid in the vessel, a tailpipe connected at its one end to an exhaust port of the combustion chamber and being extended outwardly through the vessel, and an exhaust muffler assembly connected to an exhaust end of the tailpipe. The exhaust muffler assembly includes a plurality of mufflers connected in series to the exhaust end of the tailpipe, a final one of the mufflers being in the form of a resonance type muffler for reducing low frequency noises caused by pulse combustion in the combustion chamber. The final one of the mufflers is detachably mounted in place at the outside of the support frame for easy replacement with another resonance type muffler and connected to the preceding muffler in a disengageable manner.

Abstract: A thermally driven gas resonance device includes a resonance tube (3) which expands in cross-section along its length from one end to the other, a heat source (2) located at the one end of the resonance tube, and an igniter (14) to trigger oscillations in a gas in the tube. The heat source (2) is preferably a pulsed heat source having a repetition frequency corresponding to a resonant frequency of the gas tube (3). The mechanical energy produced in the oscillating gas may be used to operate a pressure swing gas separator by including a bed (16) of molecular sieve material in the other end of the tube (3). Alternatively, the mechanical energy may be used to drive a heat pump (19). In this case a heat sink (21) is located at the other end of the tube (3), a regenerator (20) is also located adjacent the other end, and ports (8) on the side of the regenerator (20) towards the heat source (2) effect heat exchange between the gas in the resonance tube (3) and a source of low grade heat.

Abstract: A pulse combustion fat fryer of the table type includes a box-type cabinet having a front compartment and an upright rear compartment, an open-top vessel assembled within the front compartment to store an amount of cooking oil, the vessel having a front wall and a bottom wall the front part of which is located adjacent a bottom plate of the cabinet and the rear part of which is spaced upward from the bottom plate, a pulse combustion burner having a combustion chamber secured at its inlet end to the front wall of the vessel and immersed in the liquid in the vessel, a tailpipe connected at one end thereof to an exhaust port of the combustion chamber and being extended outwardly from the vessel, an air intake muffler and an exhaust muffler vertically disposed in parallel within the upright rear compartment of the cabinet, an air chamber casing secured to the front wall of the vessel and being connected to the air intake muffler to be supplied with fresh air, an exhaust decoupler located just below the rear part

Abstract: A combustion chamber of a pulsating combustor is supplied with fuel from a fuel-supplying system and with air for combustion from an air-intake chamber through an air-intake pipe. The air-intake pipe is interiorly provided with an aerodynamic valve having a forward flow coefficient greater than a flow coefficient in a reversed direction. An air-supplying fan controlled by a combustion control unit is connected to the air-intake chamber. A fuel control valve for varying the amount of fuel supplied to the combustion chamber is connected to a fuel-supplying pipe of a fuel-supplying system. When a mixture gas within the combustion chamber is fired at the start of a pulsating combustion system, the combustion control unit rotates the air-supplying fan at high speed to forcibly feed air for combustion into the combustion chamber.

Abstract: A pulse combustion fired space heater is disclosed. The heater has an exterior cabinet enclosing an interior housing having a pulse combustion burner mounted therein. The burner includes a plurality of generally flat elements which cooperate with the interior housing to provide a tortuous path for air circulated through the chamber during heat transfer. The circulating air pressurizes the interior housing to enhance uniformity of heat transfer and suppress structural vibrations.

Abstract: Pulse combustors and associated air mixers are used to process fuel and calcium based sorbent outside of a furnace or boiler. liquid or solid fuel is rapidly volatilized in the air mixer of the first pulse combustor, producing high gaseous fuel content and a highly reactive char or soot. This material is then injected into the upper part of the furnace, above the conventional burners, to create a fuel rich zone which reduces previously formed nitrogen oxide (NOx) pollutants. The calcium based sorbent is injected into a second pulse combustor, located higher in the furnace. The sorbent is flash calcined in the air mixer of the pulse combustor yielding a high surface area sorbent. This material is then injected into the furnace above the first pulse combustor to reduce previously formed sulfur oxide (SO2) pollutants. In addition, the stream from this combustor and air mixer provides the air needed to completely burn out the coal fuel from the first pulse combustor.

Abstract: The burners of a fuel-fired system are controlled by means of a feedback control system for temperature control. The control system comprises temperature measuring means, a controller for temperature control, final burner controlling means translating the output from the controller into an appropriate burner input rate, and a digital central processing unit determining pulse spacing (t.sub.ps), pulse duration (tON) and pulse separation (tOFF). A minimum pulse spacing (.sup.t ps.sub.min), being the sum of the minimum pulse duration (tON.sub.min) and the minimum pulse separation (tOFF.sub.min), is present and used as an input rate reference value. Using the input rate reference value for the minimum pulse spacing, the burner input rate is controlled in accordance with process requirements by varying pulse spacing (t.sub.ps) through varying pulse separation or pulse duration.

Abstract: A pulse combustion space heater and burner are disclosed. The heater has an exterior cabinet enclosing an interior housing having the burner mounted therein. The burner includes a plurality of generally flat elements which cooperate with the interior housing to provide a tortuous path for air circulated through the chamber during heat transfer. A labyrinthine air flow passageway lined with sound attenuating material is provided immediately upstream of the heater air discharge. The burner tailpipe comprises a weldment of two identical sheet metal pieces which cooperatively define a tailpipe conduit. A fuel gas inlet orifice is mounted in the wall of the mixer head to effect both regulation of the average flow rate and injection of the fuel to enhance its mixture with the air.

Abstract: A gas distributor in the fuel gas supply system of a pulse combustion apparatus comprises a cylindrical wall having one end connected to the rest of the fuel gas supply system and another end defining an end wall facing a flame trap and spaced apart therefrom. The distributor is removably connected to the rest of the fuel gas supply system and its end wall has an adjustable distance from the flame trap. The distributor has a plurality of nozzle openings which may be provided through its cylindrical or end wall, or through both of its cylindrical and end walls.

Abstract: A pulse combustor apparatus adapted to burn either a liquid fuel or a pulverized solid fuel within a preselected volume of the combustion chamber. The combustion process is substantially restricted to an optimum combustion zone in order to attain effective pulse combustion operation.

Abstract: A pulse combustion heating apparatus includes a open-top vessel assembled within a support frame to store an amount of liquid such as cooking oil to be heated, and a pulse combustion burner mounted to the vessel and having a combustion chamber secured at its inlet end to a side wall of the vessel and immersed in the liquid in the vessel and at least a pair of tailpipes each connected at their inner ends to an exhaust port of the combustion chamber in such a manner that the tailpipes are arranged symmetrically in the vessel and immersed in the liquid and being extended outwardly from the vessel. The vessel has a pair of parallel bottom walls inclined downwardly inwardly toward the center of the vessel, and a pair of cylindrical decouplers are housed in a pair of spaces just below the bottom walls of the vessel within the support frame and located in parallel along the bottom walls of the vessel.

Abstract: A process for pulse combustion in a horizontal pulse combustor having at least one air inlet flapper valve, at least one fuel inlet flapper valve, a combustion chamber, and a plurality of downstream combustion chamber branches in which each is in communication with a plurality of downstream exhaust tubes. The process includes the steps of introducing air through the air inlet flapper valve into a mixing zone. Fuel is introduced through the fuel inlet flapper valve into the mixing zone. A combustible fuel/air mixture is formed within the mixing and ignition chamber and is ignited there to complete combustion within the combustion chamber. Combustion product gases are exhausted through the combustion chamber branches and further exhausted through the exhaust tubes.

Abstract: A pulse combustion apparatus includes a hot water storage tank, a combustion chamber provided in the tank, a mixing chamber disposed outside the tank and connected to the combustion chamber, an air supply line comprising an air pipe, a fan, a muffler and an air chamber and connected to the mixing chamber, a fuel supply line connected to the mixing chamber, and an exhaust line connected to the combustion chamber. The muffler is disposed between the fan and the air chamber. The exhaust line includes a muffler disposed in the tank and connected to the combustion chamber by a tailpipe.

Abstract: A gas cooking appliance for cooking chow mein, pan cakes or the like on a hot plate mounted thereon, which cooking appliance includes a pulse combustion burner installed within an internal compartment of the appliance and having a combustion chamber coupled with a bottom portion of the hot plate to take place pulse combustion of a mixture of gaseous fuel and air supplied thereinto, wherein the hot plate is in the form of a thick metallic plate formed therein with a tailpipe passage which is connected at one end thereof to an exhaust port of the combustion chamber and extends outwardly through the metallic plate to permit the flow of combustion products discharged therethrough from said combustion chamber.

Abstract: A pulsating combustion system comprising a pair of pulsating combustors of the same structure connected in parallel between an air-intake chamber and an exhaust chamber and having an air-intake pipe and an aerodynamic valve fitted within the air-intake pipe. A separation valve is located in said air-intake chamber, for partitioning the air-intake chamber into a sub-chamber communicating with the air-intake pipe of the first pulsating combustor and a sub-chamber communicating with the air-intake pipe of the second pulsating combustor. In operation, the separation valve partitions the air-intake chamber into two sub-chambers, and the pulsating combustors are operated independently of each other for some time. When the pulsating combustion performed by either pulsating combustor becomes sufficiently stable, the separation valve is gradually opened, thus connecting said pulsating combustors. Thereafter, both combustors continue to perform stable pulsating combustions, perfectly out of phase.

Abstract: An ultrasonic burner system for regenerating a filter comprises an ultrasonic atomizer for atomizing fuel oil into fine droplets and a combustion chamber that is adapted to pass a exhaust gas created therein by the combustion of the fine droplets toward the filter to regenerate the filter by burning previously unburnt matter trapped thereby, wherein the fine droplets are burned in such a manner that the exhaust gas is at a higher temperature in the wall region than in the axially central part of the combustion chamber. Consequently, the combustion chamber can be made compact, and since the temperature of the combustion gas flowing in the combustion chamber is made higher in the wall region than in the axially central part of the combustion chamber, the temperature distribution in the filter can be made uniform.

Abstract: An improved flame holder based tunable pulse combustor, and a processing system employing same. The processing system is for thermal, chemical, and physical processes which employ natural acoustic modes in a processing chamber to enhance the processing. An acoustically resonant processing chamber is provided as the processing vessel. A frequency tunable pulse combustor comprising a flame holder is positioned to excite natural acoustic modes in the processing chamber. Material introduced into the processing chamber is thereby subjected to acoustic pulsations while the material is being processed. The acoustic excitations in the system result in improved moisture removal and particle heating. Also disclosed are various embodiments of frequency and amplitude tunable pulse combustors which may be employed to excite the natural acoustic modes in the processing chamber, including axially translatable acoustic decoupler and flame holder configurations.

Abstract: The non-return valve in the air inlet of a pulsating burner includes a flat circular ring of elastic steel. The outer edge of the ring is provided between annular abutment surfaces with a predetermined play. The inner edge of the ring is movable from a closed position to a fully open position in which it has the shape of a truncated cone. The angle between the conical surface of the frustrum and its base is small in the fully open position, on the order of 3.degree., and resistance to opening is extremely small to permit rapid changes between the open and closed positions.

Abstract: A vessel assembly defining a combustion chamber in a pulsating combustor is composed of a pair of generally boat-shaped vessels each made by plastic deformation and having a longitudinal plane terminating in a transverse plane which is perpendicular to its longitudinal plane. Each vessel is open in both of its longitudinal and transverse planes and has an exhaust port. The vessels are joined to each other in their longitudinal planes to form an integral assembly which is totally closed except for the exhaust ports and the transverse planes in which they form an end opening for admitting a mixture of fuel and air into the assembly. The assembly is joined around its end opening to the edge of an opening made in a wall defining a vessel for holding the liquid to be heated.

Abstract: A pulse combustion device wherein pulse combustion of a rich mixture of primary air and gaseous fuel is established without provision of conventional non-return valves.

Abstract: A pulse combustor having a combined mixing and ignition chamber in communication with a fuel inlet tube and an air inlet tube. The fuel inlet tube and air inlet tube inject fuel and air, respectively, forming a fuel/air mixture in the mixing and ignition chamber. An ignition source for igniting the fuel/air mixture is located within the mixing and ignition chamber. A main combusiton chamber is sealably secured to the main combustion chamber wall and in comunication with the mixing and ignition chamber. The main combustion chamber first splits into a plurality of downstream combustion chamber branches, each of which further split into a plurality of exhaust tubes. The combustion chamber branches of the main combustion chamber have a slot between the combustion chamber branches. At least one reinforcing strut is secured between the combustion chamber branches within the slot between the combustion chamber branches of the main combustion chamber.

Abstract: A pulse combustion device having a mixing chamber arranged to be supplied with primary air and gaseous fuel, and a combustion chamber which is supplied with a mixture of gaseous fuel and air from the mixing chamber to take place pulse combustion of the mixture therein. The pulse combustion device includes an air intake system which is composed of a primary air intake system for adjusting an amount of primary air supplied into the mixing chamber to create a rich mixture of gaseous fuel and primary air in the mixing chamber, and a secondary air intake system for supplying secondary air into the combustion chamber and for adjusting an amount of the secondary air to be mixed with the rich mixture in the combustion chamber.