Combined Boiler And Furnace Controlled Patents (Class 236/14)
  • Patent number: 9657946
    Abstract: A burner control system for improving burner performance and efficiency. The system may determine fuel and air channel or manifold parameters. Determination of parameters may be performed with a sensor connected across the air and fuel channels. A signal from the sensor may control the parameters which in turn affect the amounts of fuel and air to the burner via a controller. Parameter control of the fuel and air in their respective channels may result in more accurate fuel and air ratio control. One or more flow restrictors in fuel and/or air bypass channels may further improve accuracy of the fuel and air ratio. The channels may be interconnected with a pressure or flow divider. Byproducts of combustion in the exhaust, temperatures of gas and air, flame quality and/or other items may be monitored and adjusted with control of the fuel and air ratio for optimum combustion in the burner.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: May 23, 2017
    Assignee: Honeywell International Inc.
    Inventors: Gregory Young, David Kucera, Donald J. Kasprzyk, Willem Super, Jos Praat, Roelof Thiewes, Hans M. van der Mei, Brian Zabel, John D. Mitchell
  • Patent number: 9638419
    Abstract: A steam power station is provided having a steam boiler which can be fired by a combustion device in a combustion chamber and has an air preheater which is suitable for removing thermal energy from the flue gas of the combustion chamber in order to transfer the thermal energy to a first air flow, the first air flow being fed back to the combustion chamber at least partly as combustion air. The steam power station also has a high-temperature battery which can likewise be supplied with air from the first air flow.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: May 2, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventors: Christian Brunhuber, Carsten Graeber, Gerhard Zimmermann
  • Patent number: 9618231
    Abstract: The disclosure provides a controller for a multistage gas furnace, a multistage gas furnace and computer readable medium for performing a method to operate a furnace. In one embodiment, the controller includes: (1) an interface configured to receive a heating call and (2) a corrosion reducer configured to ignite the gas furnace at a high fire operation based on if an indoor circulating fan of the gas furnace is active.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: April 11, 2017
    Assignee: Lennox Industries Inc.
    Inventors: Glenn W. Kowald, Hans J. Paller
  • Patent number: 9234661
    Abstract: A burner control system for improving burner performance and efficiency. The system may determine fuel and air channel or manifold parameters. Determination of parameters may be performed with a sensor connected across the air and fuel channels. A signal from the sensor may control the parameters which in turn affect the amounts of fuel and air to the burner via a controller. Parameter control of the fuel and air in their respective channels may result in more accurate fuel and air ratio control. One or more flow restrictors in fuel and/or air bypass channels may further improve accuracy of the fuel and air ratio. The channels may be interconnected with a pressure or flow divider. Byproducts of combustion in the exhaust, temperatures of gas and air, flame quality and/or other items may be monitored and adjusted with control of the fuel and air ratio for optimum combustion in the burner.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: January 12, 2016
    Assignee: Honeywell International Inc.
    Inventors: Gregory Young, David Kucera, Donald J. Kasprzyk, Willem Super, Jos Praat, Roelof Thiewes, Hans van der Mei, Brian Zabel, John D. Mitchell
  • Patent number: 9148941
    Abstract: A first temperature distribution that represents a temperature of an element adjacent to and distinct from a first optical element that is positioned to receive an amplified light beam is accessed. The accessed first temperature distribution is analyzed to determine a temperature metric associated with the element, the determined temperature metric is compared to a baseline temperature metric, and an adjustment to position of the amplified light beam relative to the first optical element is determined based on the comparison.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: September 29, 2015
    Assignee: ASML Netherlands B.V.
    Inventors: Vladimir Fleurov, Igor Fomenkov, Shailendra Srivastava
  • Patent number: 8888011
    Abstract: A controller includes a program for controlling a group of boilers having boilers with a plurality of staged combustion positions. The program is arranged to control the boilers and the combustion positions such that a total load following evaporation amount obtained by summing up load following evaporation amounts of the respective boilers comprising the group of boilers becomes equal to or more than a setup load following evaporation amount which is an evaporation amount that the group of boilers is to follow.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: November 18, 2014
    Assignee: Miura Co., Ltd.
    Inventors: Koji Miura, Kazuya Yamada
  • Patent number: 8844834
    Abstract: Thermal targeting technology is used to continuously adjust boiler target temperature to the minimum necessary to satisfy the required heating load. Responsive to and initiated by a first call for heat, boiler target temperature is reduced by a predetermined amount upon or subsequent to the call for heat. Once the boiler temperature reaches this new target, a call timer is activated. If demand for heat is satisfied before a time set point is reached, the system ceases providing additional heat energy until the next heat demand. Responsive to and initiated by a next call for heat, the boiler target temperature is again reduced by the predetermined amount upon or subsequent to this next call for heat. Each time the heat demand is satisfied within the predetermined time interval, the boiler target temperature is reduced. If heat demand is not satisfied, a thermal boost is provided at set time intervals until the call for heat is removed.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: September 30, 2014
    Assignee: C. Cowles & Company
    Inventors: Richard A. Lyons, Christopher L. Murray, William Montgomery, Robert Schiller, Timothy Van Leeuwen
  • Patent number: 8521333
    Abstract: An improved method and system for flue gas recirculation (FGR) from the ID Fan located downstream of a scrubber (or other Air Quality Control Equipment including cyclones, baghouses, etc., hereafter “AQC equipment”) back to the scrubber (or other AQC Equipment) inlet to maintain the minimum required flue gas throughput during low-load conditions, thereby eliminating the need for a separate booster fan. A flue gas recirculation duct is connected from downstream of the ID Fan to the inlet of the scrubber (or other AQC Equipment). A variable flow restrictor is placed in the duct downstream of the ID Fan for controlling pressure of the recirculated flue gas. The flow restrictor is controlled in accordance to a function of boiler load or flue gas flow to produce the required backpressure that enables the flue gas to flow through the recirculation duct back to the inlet of the scrubber (or other AQC Equipment) at low loads.
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: August 27, 2013
    Assignee: Andritz Environmental Solutions
    Inventors: Mark Richman, Michael Hoeg Nielsen, Ralph Joseph Lebron
  • Publication number: 20120006285
    Abstract: A controller includes a program for controlling a group of boilers having boilers with a plurality of staged combustion positions. The program is arranged to control the boilers and the combustion positions such that a total load following evaporation amount obtained by summing up load following evaporation amounts of the respective boilers comprising the group of boilers becomes equal to or more than a setup load following evaporation amount which is an evaporation amount that the group of boilers is to follow.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 12, 2012
    Applicant: MIURA CO., LTD.
    Inventors: Koji Miura, Kazuya Yamada
  • Patent number: 8070482
    Abstract: A system of detection and analysis of gas or fuel oil flames using optical devices, consisting of a sensor that targets the flame's reaction zone through an optical access, a processing and control module, and an actuator, responsible for controlling the damper. The system optimizes combustion equipment operation by controlling the damper, obtaining better performance and reducing polluting emissions.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: December 6, 2011
    Assignees: Universidad de Concepción, Universidad de la Frontera, ANWO S.A
    Inventors: Oscar Francisco Farias Fuentes, Daniel Gerónimo Sbarbaro Hofer, Robinson Eugenio Betancourt Astete
  • Patent number: 7161678
    Abstract: Excess oxygen in the combustion process of a facility that bums carbon-based fuels may cause a visible plume in the atmosphere at the stack of the facility. Traditional optical based opacity monitors may be unable to detect this plume or the plume may form at a location downstream from the opacity monitor toward the stack. The present invention discloses methods to utilize common combustion control variables to detect and signal the presence of a visible plume of exhaust gasses. Also disclosed are systems that detect the visible plume and provide a signal so that the combustion process may be manually or automatically adjusted to reduce or eliminate the visible plume.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: January 9, 2007
    Assignee: Florida Power and Light Company
    Inventor: Paul Clarence Schultz
  • Patent number: 6039261
    Abstract: A method and apparatus for achieving optimal combustion. A boiler has a blower-type burner operatively associated therewith wherein the burner has a variable speed blower. Combustive air is provided to the burner, and in accordance with the invention, a gaseous combustion-correcting complex is provided for supplying a plurality of gaseous additives to the combustive air of the burner. A plurality of sensors are disposed within the boiler and burner, and within a discharge outlet of the boiler, and a central unit is operatively connected to the sensors for receiving information signals therefrom. In response to the information signals received from the sensors, the central unit controls the speed of the variable speed blower and the operation of the gaseous combustion-correcting complex for providing predetermined amounts of the additives to the combustive air.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: March 21, 2000
    Inventor: Guy Pavese
  • Patent number: 5279263
    Abstract: The firing rate and the feedwater flow rate of a universal pressure boiler are controlled using a cascaded steam temperature control system. The secondary superheater outlet temperature comprises an outer loop for the control system, while the convection pass outlet temperature comprises an inner loop for the control system. Control variables for the system include the secondary superheater outlet temperature, the convection pass outlet temperature and the difference between the primary superheater outlet temperature and the secondary superheater inlet temperature.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: January 18, 1994
    Assignee: Elsag International B.V.
    Inventors: Max-Alix Cameau, Alfred Schultz, Lemuel E. Dolan
  • Patent number: 5261337
    Abstract: The present invention aims for the object thereof at preventing unburnt gas and noxious gas components from being generated in a refuse incinerator, and provides a combustion control method by which it is arranged so that a feeder (2) and a stoker (3) are not only controlled so as to keep evaporation (S1) of the boiler at a target value thereby to achieve stabilized combustion extending over a long period of time, but also feed water quantity (S2) and the like from a boiler water pipe section (2) forming a combustion chamber (6) are detected, and the rate of overfire air quantity to main combustion air quantity to a lower part of the stoker is controlled at a constant total gas capacity so that the fluctuation width of the feed water quantity (S2) falls within a set range.
    Type: Grant
    Filed: May 13, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Norihiko Orita, Hidetaka Ono, Masaharu Kira, Shizuo Yasuda
  • Patent number: 5230293
    Abstract: A multi-loop control system and a method for using the control system to even out the generation of heat produced by a refuse incineration plant. The quantity of steam generated is controlled as a primary controlled variable and the oxygen content of the flue gas is controlled as a secondary controlled variable. This method makes it possible to improve other parameters in operating a refuse incineration plant.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: July 27, 1993
    Assignee: Von Roll AG
    Inventor: Alfons Schirmer
  • Patent number: 5199385
    Abstract: The present invention provides a water heater capable of exhausting flue gases from an interior space of a building to an exterior space and is adapted for installation through an upstanding wall. The water heater has an insulated tank with a water inlet and a water outlet together with a flue pipe opening at one end thereof beneath the tank upon a combustion chamber containing a fuel burner. The other end of the flue pipe opens at the top of the tank upon a flue gas collector and has a flue gas restricter for restricting the outward flow of flue gases from the flue pipe. The collector includes a collector box connected to the top of the water heater above and in alignment with the flue pipe, a blower and a low temperature flue gas exhaust line. The collector box has at least one air inlet for mixing air from the interior space of the building with flue gases exiting the flue pipe to inhibit condensation and reduce the temperature of the flue gases flowing through the exhaust line.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: April 6, 1993
    Assignee: Bradford-White Corp.
    Inventor: Garrett L. Doss
  • Patent number: 5161488
    Abstract: A steam boiler (2) including a fire tube (21) and convection heating surfaces (22) is preceded by a combustion chamber (30) including a surface burner (34) for high excess air. The combustion chamber (30) and the fire tube (21) are internally thermally insulated (33). The combustion air supply opening (37) of the burner (34) is connected by way of a blower (40) with an exhaust air source (1). A fuel control valve (36) is controlled as a function of the boiler load. A plurality of heat exchangers (47, 48, 49) are incorporated in the flue gas channel (45) following the convection heating surfaces (22). The most upstream heat exchanger (47) is connected on the water inlet side by way of a pump (51) to the water chamber (23) and on the water outlet side by way of a baffle (53) to the water-steam circuit of the boiler (2). With this system it is possible to purify all of the exhaust air from the exhaust air source (1) over a broad boiler (2) load range.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: November 10, 1992
    Assignee: Koenig AG
    Inventor: Arthur Natter
  • Patent number: 5052310
    Abstract: A process is disclosed for controlling the combustion and temperature in an solid waste-to-steam incineration system comprising a grated combustion zone and a steam boiler. This control is achieved by a synergistic combination of oxygen enrichment of an air stream and liquid quench fed to the combustion zone. The disclosed process includes the steps of adjusting the amount of solid waste passing into the combustion zone in order to maintain a constant flow of steam leaving the steam boiler, adjusting the amount of liquid quench to the incinerator in order to maintain a constant temperature in the combustion zone and adjusting the amount of oxygen enrichment of the air stream in response to a change in flow of the liquid quench to the incinerator. An apparatus for accomplishing the foregoing is also disclosed.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: October 1, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Stephen P. Goff, Joseph Klosek, Donald P. Bucci, Paul A. Kinniry
  • Patent number: 5044326
    Abstract: Apparatus is provided for controlling the burning of a volatile waste liquid together with a conventional fuel in a boiler in the form of a free-standing module which contains a flow-control valve for the waste liquid. This system includes a means for monitoring the position to the fuel-control valve for the conventional fuel and a separate means for monitoring the position of a controlled valve for feeding of the volatile liquid. The two monitoring means are coupled and comparisons are made of the relative valve positions indicated thereby. The process controller used for such comparison contols a valve which stops the flow of volatile liquid to the burner in the event that more than a predetermined discrepancy occurs between the indicated valve positions. Said controller may also be employed to correct the valve position. Other features include a reverse purge pumping system which is actuated upon shutdown of volatile fuel flow.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: September 3, 1991
    Assignee: Aqua-Chem, Inc.
    Inventors: Philip R. Coerper, Boris M. Tynkov
  • Patent number: 5027751
    Abstract: Boiler operations are fine tuned to minimize thermodynamic losses and pressure losses across throttle valves at the output of a boiler. Whenever the boiler is operating outside of desired operating levels, the first action considered is to reduce spray flows into steam supplied into a reheater or superheater outputting steam at too low of a temperature. The second consideration is to reduce the use of auxiliary electrical power, such as fans supplying tempering air to the primary air used to carry fuel to the burners. The next consideration is selective soot blowing and damper adjustments to redistribute heat in combustion product exhaust gas in the boiler. Then, if possible, the quantity of flue (combustion product) as recycled is adjusted to modify the gas temperature and the heat transferred in the radiant (furnace and superheat) sections and the convective (reheat and economizer) sections of the boiler.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: July 2, 1991
    Assignee: Westinghouse Electric Corp.
    Inventors: David H. Archer, M. Mustaq Ahmed
  • Patent number: 4984524
    Abstract: The combustion of fuel having a highly fluctuating thermal value is controlled to permit optimization of air supply and reduction of waste gas impurities. The fuel passes through a combustion chamber having a degassing and evaporation zone, a primary combustion zone, and a secondary combustion zone. Measurements are taken in the evaporation and degassification zone to determine the thermal value of the fuel. This is done by detecting the intensity of H.sub.2 O and/or CO.sub.2 spectra emanating from the fuel. The measurement results are utilized to optimize the combustion parameters. Such measurements are also made in the following zones in order to provide further control of the combustion process.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: January 15, 1991
    Inventors: Kurt-Henry Mindermann, Franz Wintrich
  • Patent number: 4922861
    Abstract: A multiple purpose instantaneous gas water heater comprises a combination of a larger combustion capacity type first burner with a smaller combustion capacity type second burner. Each of the burners can be controlled by a proportional combustion control method and/or an intermittent combustion control method. It is possible to combine these functions within a microcomputer system so as to use each or both burners selectively, or both together, so that it is possible to select water from a wide range of hot water temperatures or to select a target temperature.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: May 8, 1990
    Assignee: Toto Ltd.
    Inventors: Osamu Tsutsui, Hideki Kawaguchi, Keiji Hayashi, Masahiro Kayano, Shingo Tanaka, Hiroshi Kobayashi, Hisashi Nakamura, Atsuo Makita
  • Patent number: 4901678
    Abstract: A fan forces air through an air inlet channel to a mixing chamber where it is mixed with fuel, and the mixture is then fed to a burner. The combustion products of the burner provide heat to a heat exchanger which is connected to a discharge channel. The contamination of the system is measured, and the speed of the fan is increased upon an increase in the contamination. The heating system is automatically prevented from operating when the contamination exceeds a predetermined value.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: February 20, 1990
    Assignee: Econosto N.V.
    Inventor: F. H. C. Nouwens
  • Patent number: 4895082
    Abstract: The combustion of fuel having a highly fluctuating thermal value is controlled to permit optimization of air supply and reduction of waste gas impurities. The fuel passes through a combustion chamber having a degassing and evaporation zone, a primary combustion zone, and a secondary combustion zone. Measurements are taken in the evaporation and degassification zone to determine the thermal value of the fuel. This is done by detecting the intensity of H.sub.2 O and/or CO.sub.2 spectra emanating from the fuel. The measurement results are utilized to optimize the combustion parameters. Such measurements are also made in the following zones in order to provide further control of the combustion process.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: January 23, 1990
    Inventors: Kurt-Henry Mindermann, Franz Wintrich
  • Patent number: 4838183
    Abstract: An apparatus for burning waste refuse having a heterogeneous composition comprising means defining a combustion chamber having an inlet for charging waste refuse therein and an outlet for discharging combustion gases therefrom, means disposed within the combustion chamber for agitating waste refuse charged therein, means for sensing the temperature differential of combustion gases emanating from the burning waste refuse disposed on the agitating means, between spaced points along the path of flow of the emanating combustion gases, and means responsive to variations of the sensed temperature differential relative to a preselected temperature differential for adjusting the operation of the agitating means.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: June 13, 1989
    Assignee: Morse Boulger, Inc.
    Inventors: Thomas Tsaveras, Matthew J. Gaskin, John T. Maidhof
  • Patent number: 4819587
    Abstract: A multiple purpose instantaneous gas water heater comprises a combination of a larger combustion capacity type first burner with a smaller combustion capacity type second burner. Each of the burners can be controlled by a proportional combustion control method and/or an intermittent combustion control method. It is possible to combine these functions within a microcomputer system so as to use each or both burners selectively, or both together, so that it is possible to select water from a wide range of hot water temperatures or to select a target temperature.
    Type: Grant
    Filed: July 9, 1986
    Date of Patent: April 11, 1989
    Assignee: Toto Ltd.
    Inventors: Osamu Tsutsui, Hideki Kawaguchi, Keiji Hayashi, Masahiro Kayano, Shingo Tanaka, Hiroshi Kobayashi, Hisashi Nakamura, Atsuo Makita
  • Patent number: 4805114
    Abstract: An economical despatching arrangement for despatching load and fuel assignments on a multi-boiler cogenerative type steam generating plant includes a logic arrangement of determining a present value of flow of each fuel to each boiler, a logic arrangement of determining a present value of the share of the steam load carried by each of the boilers, a logic arrangement for calculating an optimal next value for each of the load and fuel assignments, a logic arrangement for estimating a proportionate share value for one of the boilers and the fuel flow values for one of the fuels and a logic arrangement for implementing the optimal next values as a function of whether a manual or automatic mode of operation has been selected for the particular parameter.
    Type: Grant
    Filed: April 20, 1987
    Date of Patent: February 14, 1989
    Assignee: Westinghouse Electric Corp.
    Inventors: Richard E. Putman, Thomas Allen
  • Patent number: 4802446
    Abstract: A safety device for subcritical natural and forced circulation boilers wherein the differential between downcomer fluid temperature and drum saturation temperature is measured and the trend of the differential is determined by computer means on a continuous basis. If the differential approaches a defined limit in its trend in a defined time interval or the furnace tube temperature increases instantaneously, the heat source for the boiler is diminished.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: February 7, 1989
    Inventor: Leonard E. Triggs
  • Patent number: 4791889
    Abstract: A system for controlling steam temperature in a boiler using a time delay feedback controller known as a Smith Predictor to provide control tuning of true boiler parameters which change with load.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: December 20, 1988
    Assignee: The Babcock & Wilcoc Company
    Inventors: Theodore N. Matsko, Robert S. Rand, Thomas D. Russell, Thomas J. Scheib, Robert R. Walker, deceased
  • Patent number: 4779795
    Abstract: According to the present invention there is provided a boiler comprising a firebox, a control device controlling the flow of air into the firebox, a water jacket surrounding at least part of the firebox, a sensor to sense the temperature of the water in or being discharged from the water jacket, the sensor being adapted to control directly or indirectly the control device. The sensor can be a temperature sensitive valve associated with the water jacket to control the position of the control device to thereby govern the flow of air to the firebox. The invention further provides a method of providing space heating and hot water from a boiler unit comprising the operation of a boiler unit.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: October 25, 1988
    Inventor: John A. Winmill
  • Patent number: 4770340
    Abstract: A boiler air flow controlling apparatus for feeding air in a desired air flow to a boiler by cooperation of a first fan for feeding air to the boiler with a second fan for sucking air from said boiler. The apparatus includes means for varying, when the number of poles of at least one of motors for the two fans is changed over, the opening of a damper located in an air course in order to restrict a variation of the inner pressure of the boiler upon such changing over to a value within an allowable range.
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: September 13, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Nobuharu Takata
  • Patent number: 4768469
    Abstract: An apparatus for controlling operation of a recovery boiler for compensating a predetermined reference temperature of black liquor by a compensation value in accordance with a type of an injecting gun provided in the boiler, a compensation value set by the properties of the black liquor, a compensation value set by the temperature of charbed and a compensation value set by an air flow rate to the boiler representing the magnitude of boiler steam output or load to control the black liquor temperature supplied to the boiler.
    Type: Grant
    Filed: August 26, 1987
    Date of Patent: September 6, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuyuki IIzuka, Tsuguo Kumaki, Ryuichi Kuwata, Iwao Chikahisa, Yoshikazu Fukushima, Youhei Shiokoshi, Takao Matsuda, Masaru Nishimura, Takashi Tanihara, Yoshimitsu Kurosaki, Toshiyuki Itoko, Shirou Nakabayashi
  • Patent number: 4749122
    Abstract: In a combustion system, the economic optimum efficiency is achieved by periodically computing a relative index of combustion efficiency using the combustion chamber as a real-time, on-line calorimeter. This is accomplished by first determining the combustion chamber inputs and outputs required to calculate a relative index of performance (including measuring the amount of heat released or work performed at the present air/fuel ratio including the stack losses, without oxygen and/or carbon monoxide sensors), sequentially comparing the latest relative index value with the previous value, then adjusting the air/fuel ratio to achieve an improved index value.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: June 7, 1988
    Assignee: The Foxboro Company
    Inventors: James E. Shriver, David P. Dickhaut
  • Patent number: 4724775
    Abstract: The subject invention relates to an improved method and apparatus to control the rate of heat release (ROHR) from a reaction zone confined within a chamber, air and fuel having been introduced into said reaction zone to achieve combustion, plural sensors being utilized one sensor adapted to sense ROHR, another to generate a target value for a desired ROHR within a comparator, still another sensor to determine heat generation and transmit it to the comparator, a control means for controlling ROHR of heat generation and connecting said comparator with said control means to achieve coincidence between a target value and said sensed value.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: February 16, 1988
    Assignee: AIR (Anti Pollution Industrial Research) Ltd.
    Inventor: Michael G. May
  • Patent number: 4716858
    Abstract: An automatic firing rate control mode arrangement is provided as a method of operation within a flame safeguard sequencer. The system uses proportional control squared, an integration which reflects the past load history to determine the present load, and further has a constant which relates the rate of change of pressure with respect to time in order to make more responsive the normal load control operation. The system is also capable of on-off control that will hold the system in low fire to allow for stabilization, and to avoid thermal shock to a boiler.
    Type: Grant
    Filed: December 18, 1986
    Date of Patent: January 5, 1988
    Assignee: Honeywell Inc.
    Inventor: James I. Bartels
  • Patent number: 4697530
    Abstract: An automatic stoker boiler has a heat transfer compartment above a combustion chamber which is divided by a horizontal partition inclined upwardly from the rear end of the boiler towards but terminating short of the front end thereof to provide a restricted port between the thus established upper and lower portions. An endless link belt establishes the lower portion of the combustion chamber and hot gas conduits extend from the upper portion through the heat transfer compartment to the exhaust and which is provided with a draft inducing fan and adjustable damper. Underfire air under the control of an adjustable damper is introduced into the lower portion of the combustion chamber upwardly through the belt and air jets are delivered into the combustion chamber through the front end both above and below the port. A standby fluid fuel burner is located in the rear end of the upper chamber portion.
    Type: Grant
    Filed: December 23, 1986
    Date of Patent: October 6, 1987
    Assignee: Dumont Holding Company
    Inventors: Richard P. Marcotte, John W. Dumont, Jr.
  • Patent number: 4637348
    Abstract: An apparatus for controlling a starting operation of a boiler which comprises a super heater, a super heater bypass valve, a turbine bypass valve and a fuel flow rate regulating valve. A temperature detector detects a temperature of the steam at a predetermined portion of the boiler. A pressure detector detect a pressure of the steam at the predetermined portion of the boiler. A desired change rate arithmetic unit calculates a desired steam temperature change rate value and a desired steam pressure change rate value on the basis of the steam pressure, the steam temperature, a desired pressure increase value, a desired temperature increase value, a saturated temperature change rate limit and a temperature increase change rate limit.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: January 20, 1987
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventor: Yukio Fukayama
  • Patent number: 4628869
    Abstract: A system for recovering the waste heat normally exhausted in the atmosphere by blast furnace stoves or other variable temperature process heaters. The system comprises a heat exchange apparatus located in the exhaust stack, heat transfer means for carrying the waste heat absorbed from the exhaust gases to a location remote therefrom, and a second heat exchange apparatus for releasing the transferred waste heat for beneficial use at the remote location. This invention also includes a reservoir for storing the heat transfer fluid used in the system and also the reservoir acts as a heat sink to moderate the temperature variation of the heat transfer fluid. The system also includes means for controlling temperature of the first heat exchanger and means for controlling the temperature of the variable temperature process heater. The preferred heat transfer fluid is maintained as a liquid during its use in the system.
    Type: Grant
    Filed: February 1, 1985
    Date of Patent: December 16, 1986
    Assignee: United States Steel Corporation
    Inventors: Dale R. Symsek, Nancy P. Regelin
  • Patent number: 4598648
    Abstract: A control circuit for a stoker-fed heating system is effective, whenever the primary sensing control (thermostat or aquastat) of the system calls for heat, to determine whether there is sufficient fire in the furnace to assure maintained combustion, and if this is not the case, to shut the system down until combustion is again assured.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: July 8, 1986
    Inventor: Joseph T. D'Angelo
  • Patent number: 4582026
    Abstract: Disclosed is an automatic anticipatory control system for controlling, by one common control quantity, a plurality of points of operation that can be changed over individually and arbitrarily between start and stop operations and between an automatic operation mode and a manual operation mode.
    Type: Grant
    Filed: April 2, 1985
    Date of Patent: April 15, 1986
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Atsushi Takita, Akira Sugano, Masayuki Kumazaki
  • Patent number: 4574746
    Abstract: A method for controlling a process heater in which a required heat demand is computed based on the enthalpy of the feed stock and the desired enthalpy of the final product, and then used as a feedforward portion of the fuel control. A second embodiment of the invention is based on the assumption that the feed stock enthalpy changes slowly or infrequently. In this embodiment fuel heating value changes are used as a feedforward portion of the fuel control.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: March 11, 1986
    Assignee: The Babcock & Wilcox Company
    Inventors: Marion A. Keyes, IV, Robert E. Pocock
  • Patent number: 4564141
    Abstract: A domestic hot water heating system which disables the normal aquastat during set-back periods where the temperature of the water source is sensed at the output manifold and the temperature of the water also is sensed a predetermined distance along the manifold to determine a demand or lack of demand for hot water. The system will enable the aquastat during a set-back period when demand is made and disable the aquastat when there is no longer a demand.
    Type: Grant
    Filed: November 5, 1984
    Date of Patent: January 14, 1986
    Assignee: Doleer Electronics, Inc.
    Inventors: Douglas J. Montgomery, Leonard H. Goldstein, Ernest Stumbo
  • Patent number: 4519540
    Abstract: The invention concerns a control device for gas boilers. The overall functions involving control and safety are ensured by a control box (26) with microprocessor which centralizes data collected from the ambient thermostat (27), the temperature sensor (28) on the duct (21) for heating water return, the air output sensor (19), the drawing contact (31), the extraction fan (6) speed sensor (30), and the lighter (24), and it converts them into digital signals that are made to operate the lighter, the circulation pump (19), the gas inlet electrovalve (12) and the extraction fan according to the control data that the microprocessor has memorized. Application for forced draft steamtight gas boilers.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: May 28, 1985
    Assignee: Societe Anonyme Saunier Duval eau Chaude Chauffage - S.D.E.C.C.
    Inventors: Franck Boulle, Michel Zveguintzoff
  • Patent number: 4499857
    Abstract: Controlling a fluidized bed coal combustor by sensing certain variables and thereby controlling other variables.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: February 19, 1985
    Assignee: Wormser Engineering, Inc.
    Inventor: Alex F. Wormser
  • Patent number: 4498428
    Abstract: A desired ratio of offgas to fuel gas is maintained for a fuel mixture supplied to the burners associated with a boiler by venting steam as required to insure than all offgas may be combusted while maintained the desired offgas to fuel gas ratio. The venting of steam causes the fuel gas control, which is based on steam pressure, to vary the flow rate of the fuel gas so as to maintain the desired offgas-fuel gas ratio. Control of the combustion process for the boiler in this manner results in total combustion of the offgas without violating process constraints.
    Type: Grant
    Filed: April 10, 1984
    Date of Patent: February 12, 1985
    Assignee: Phillips Petroleum Company
    Inventors: Ronald J. LaSpisa, Merle R. Likins, Jr., William R. King
  • Patent number: 4497283
    Abstract: The control of the actual liquid level in a boiler is accomplished by using the flow rate of the fuel to the combustion system associated with the boiler to generate a signal which is utilized to bias a control signal generated in response to steam flow rate and the output from a conventional level controller in such a manner that swell and shrink caused by changes in fuel flow rate is compensated for and the desired liquid level is maintained in the boiler.
    Type: Grant
    Filed: November 18, 1983
    Date of Patent: February 5, 1985
    Assignee: Phillips Petroleum Company
    Inventors: Ronald J. LaSpisa, Merle R. Likins, Jr.
  • Patent number: 4489679
    Abstract: A once-through steam generator has both radiant and convection sections. The flue gases discharged from the convection section are passed through a wet scrubber to remove both sulfur oxides (SO.sub.x) and particulate matter. The feedwater to the convection section has its temperature controlled by the temperature of the flue gases discharged from the convection section, reducing the temperature of the feedwater by the use of a feedwater exchanger, as the convection section progressively fouls due to particulates in the flue gases. An additional heat exchanger upstream of the feedwater exchanger and convection section which scavenges additional heat from the wet scrubber liquids while the temperature of the flue gases into the scrubber are lowered to a temperature equal to or less than the water dew point temperature of the flue gases entering the scrubber.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: December 25, 1984
    Assignee: Combustion Engineering, Inc.
    Inventor: Fletcher O. Holt
  • Patent number: 4486165
    Abstract: A combustion control apparatus of a combustion furnace by an improved fuel and air complementary control system according to master control system is disclosed, which is provided with a regulating means connected to a master controller and adapted for detecting the amount of load change and for setting the length of an air damper control rod's length changing device to a preset standard value corresponding to the load, without controlling the oxygen concentration in the exhaust gas to a standard value, when the load change is increased to a value of not lower than the preset value. The combustion control apparatus can control stably the oxygen concentration in an exhaust gas to a low level even when a load is suddenly changed.
    Type: Grant
    Filed: May 5, 1982
    Date of Patent: December 4, 1984
    Assignee: NGK Insulators, Ltd.
    Inventors: Jun Usami, Hiroshi Yamada
  • Patent number: 4457266
    Abstract: The control of the actual liquid level in a boiler is accomplished by using the actual enthalpy of the fluid in the boiler to generate a signal which is utilized to bias the output from a conventional level controller in such a manner that swell and shrink causes by disturbances is compensated for and a desired liquid level is maintained in the boiler.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: July 3, 1984
    Assignee: Phillips Petroleum Company
    Inventor: Ronald J. La Spisa
  • Patent number: 4451003
    Abstract: An improved control system and method for maintaining the outlet temperature of a process fluid exiting from a process fluid coil located in the convection section of a boiler having a convection section and a radiant section. The improved control system and apparatus comprise means for measuring the inlet temperature and the flow rate of a process fluid to the process fluid coil and means for measuring the temperature of the process fluid at the outlet of the process fluid coil. The improved control method and apparatus also comprise a first means responsive to changes in the inlet temperatures and flow rate to vary the amount of flue gas recirculated from the convection section of the boiler to the radiant section and a second means responsive to changes in the outlet temperature of said process fluid to vary the amount of fuel feed to the combustion section of said boiler.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: May 29, 1984
    Assignee: Exxon Research and Engineering Co.
    Inventors: Henry F. de Mena, Michael A. Tanoff