US3723047A - Control network for burning fuel oil and gases with reduced excess air - Google Patents

Control network for burning fuel oil and gases with reduced excess air Download PDF

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Publication number
US3723047A
US3723047A US00146669A US3723047DA US3723047A US 3723047 A US3723047 A US 3723047A US 00146669 A US00146669 A US 00146669A US 3723047D A US3723047D A US 3723047DA US 3723047 A US3723047 A US 3723047A
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signaling
signal
fuel
furnace
combustion
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US00146669A
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English (en)
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De Livois G Baudelet
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Controle Bailey SA
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Controle Bailey SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/08—Controlling two or more different types of fuel simultaneously

Definitions

  • This invention generally relates to improved control networks for operating a combustion process under reduced excess air conditions and particularly to a combustion process utilizing liquid and gaseous fuel simultaneously burned together in either separate or common burners with minimum heat loss from the flue of the combustion process.
  • Optimum operating efficiency occurs at a point of minimum total heat losses from the flue. This point is located in the relatively narrow range of excess air values between points B and A. Since heat losses from the flue are excessive when excess air is reduced beyond the point B value, the operating excess air point is generally set at some value A around which a slight deviation will not result in excessive heat losses from the flue. This point-is beyond the value of excess air where unburned substancesare formed.
  • Control systems operating around this point maintain air and fuel flow rates in some constant ratio or vary air flow in relation to the amount of oxygen measured in the flue of the system.
  • I Operating at increased excess air increases the possibility of corroding the low-temperature heat exchanger surface.
  • the sulphur in the fuel causes sulphur trioxide to form.
  • sulphuric acid forms which corrodes the heat exchanger.
  • excess air is reduced to a bare minimum which will allow substantially all the fuel to burn.
  • An example of such a point of reduced excess air is denoted by the point B of FIG. 2.
  • Control networks operating around this point use a sensor for detecting the unburned substances in the flue of the system.
  • the detecting sensor may be an opacimeter which detects the opacity of the flue fumes when blackened by the solid unburned hydrocarbons from the fuel.
  • An opacimeter may maintain the excess air level at a point where substantially all the fuel oil is burned but it would not detect to what extend the fuel gas was burned. Similarly an oxygen measurement of the flue would only indicate the extent to which the fuel gas was burned without regard for the fuel oil.
  • a control network for burning fuels with reduced excess air comprising: a furnace, a servo-mechanism controlling the excess air for combustion, a first and second means for sensing the unburned solids and unburned gases exhausting from the flue of the furnace, a first and second controller means associated with the first and second sensing means and a selector circuit which transmits the higher controller means signal to the servo-mechanism which then provides sufficient excess air to burn the fuel.
  • the excess air may be controlled by a control network wherein the selector circuit means transmits the higher signal of the first and second sensing means to a controller means which directly controls the servo-mechanism means to provide sufficient excess air to burn the fuel.
  • control network may utilize a third means for sensing and signalling fuel flow, a fourth means for sensing and signaling air flow and a summing circuit means for algebraically adding the third and fourth sensing and signaling means to the output of the controller means to produce a signal for controlling the servomechanism means.
  • a control network for burning liquid and gaseous fuel under reduced excess air conditions comprises: a furnace with liquid and gaseous fuel inlets and associated controlled air inlets, servo-mechanism means controlling the air flowing in these associated air inlets, first, second and third means signaling the unburned residue, combustion air flow and fuel flow, and summing circuit means for algebraically adding the first, second and third signaling means signals to control the servomechanism means.
  • This invention solves the problem of choosing an operating point value of excess air either for minimum heat loss through the flue of minimum corrosion of the heat exchanger by constantly providing a minimum excess air value which will satisfy both conditions. This is accomplished by the selector circuit means transmitting the higher signal from the first and second .sensing means.
  • This invention provides that when liquid and gaseous.
  • the first and second sensing means in combination with the selector circuit means produce a control signal which assures the common excess air value point to be a minimum which will burn both fuels.
  • This invention also provides when a fuel flow and excess air flow are compared for proper burning of fuel, that the comparison take into account the signals of the first and second sensing means to provide a correction signal which maintains the excess air flow at a level for both conditions of minimum heat loss through the flue and minimum corrosion of the heat exchanger.
  • This invention also provides that when both liquid and gaseous fuels are burned together in a common burner, the sum of the two fuel flows is compared to the excess air flow and this comparison is corrected by the first and second sensing means to assure that minimum excess air is provided for complete combustion of both fuels.
  • This invention also provides that when a liquid and a gaseous fuel if burned in separate burners with separately controlled excess air inlets, that each fuel is provided a minimum excess air flow to burn that fuel.
  • the principal object of the invention is to provide a control network which will allow a combustion process utilizing both liquid and gaseous fuel to burn both fuels, in separate or common burners, with minimum heat loss through the flue.
  • Another object of the invention is to provide a control network which will allow a combustion process utilizing one fuel to burn that fuel with minimum heat loss through the flue and minimum corrosion of the heat exchanger.
  • FIG. I is a diagrammatic general view of a boiler utilizing one embodiment of the control network of the invention.
  • FIG. 2 is a graph showing heat losses through the flue as affected by the combustion excess air.
  • FIG. 1 is a boiler 10 having a heat exchanger 12 heated by a flame 32. Water inside the heat exchanger 12 is converted to steam which then is exhausted through a steam outlet 14. Combustion products of the flame 32 are exhausted through a flue 34. Liquid and gaseous fuel to heat the boiler is pro-.
  • Combustion air is provided to the burner assembly 19 by a windbox 24 having a blower 26 supplying air flow and a damper 29 controlling the air flow.
  • the damper 29 is operated by a servo-mechanism 28 which is controlled by the control circuit C.
  • Liquid and gas fuel flows along with the combustion air flow are monitored by flow meter assemblies 20, 22, 30 respectively which are well known to those familiar with the art.
  • the control circuit C comprises an opacimeter assembly 36, having a light source 38 which transmits a beam of light through-the flue 34 where it is detected by a detector 40, a carbon monoxide gas analyzer assembly 44 and a hydrogen gas analyzer assembly 46.
  • Each assembly 36, 44, 46 transmits a signal along associated signal lines 42a, 42c, 42b respectively to individual controllers 48a, 48c, 48b.
  • Each controller has an associated reference input line 50a, 50c, 50b for providing a reference signal to each controller 48a,
  • controllers 48c, 48b against which the input signal is compared may use any combination of proportional, integral and derivative control modes as is well known to those familiar with the art.
  • the output signals from controllers 48 are inputed to a selector circuit 54 along controller associated output lines 52a, 520, 5211.
  • the selector circuit 54 compares the outputs of the controllers 48 and transmits the highest signal along an output line 56 to operate the servo-mechanism 28 accordingly.
  • liquid fuel is not burned completely, solid unburned hydrocarbons blacken the flue combustion products and cut down on the light transmitted by the opacimeter assembly 36 through the flue 34. If the gaseous fuel is not burned completely, the carbon monoxide content of the flue combustion products rises. Hydrogen content in the flue may also be used as an optional means of indicating the reducing-gas content of the flue. Thus the incomplete burning of the gaseous fuel may be sensed by the gas analyzer assemblies 44, 46 either individually or together.
  • the controller references 50 are preset to levels where complete burning of the fuel sensed is indicated.
  • the levels sensed by the opacimeter and gas analyzer assemblies 36, 44, 46 are compared thereto and any variation between these signals results in an error signal being transmitted along the output lines 52 to the selector circuit 54.
  • the highest error signal is transmitted by the selector circuit to the servo-mechanism 28 which adjusts the excess air flow. Since the excess air is adjusted according to the highest error signal, sufficient excess air is assured to burn both the liquid and gaseous fuel.
  • the opacimeter and gas analyzer assemblies 36, 46, 44 are modified to transmit identical output signals, under conditions of complete fuel combustion with minimum excess air, directly to the selector circuit 54 through signal lines 42a, 42b and 420 respectively. This is accomplished by amplifying each assembly 36, 46, 44 signal i i,,, i, by a factor u u u respectively to form the following equation:
  • the selector circuit 54 transmits the highest signal received along the output line 56 to servomechanism controller 58 which compares this signal to a common reference signal i received through a reference input line 60.
  • the controller 58 compares the signal received to the common reference signal and transmits any variation in the form of an error signal to the servo-mechanism 28 through an output line 62.
  • the controller may utilize any of the proportional, integral and derivative control modes well known to those familiar with the art.
  • the gas analyzer assembly 44 and its output line 42c are shown in dotted lines to indicate its optional nature for the functioning of the circuit network.
  • control network described with reference to FIG. 3 is combined with a summing circuit 64, a fuel flow meter assembly 66, an amplifier 76 and the air flow meter assembly 30 to burn a single fuel under reduced excess air conditions to minimize both heat loss through the flue and corrosion of the heat exchanger.
  • the selector circuit 54 along with the controller 58 then provides a corrective signal to the summing circuit 64.
  • the summing circuit 64 algebraically adds the fuel flow signal, transmitted from the flow meter assembly 66 along a signal line 70, to the air flow signal, transmitted from the flow meter assembly 30 along a signal line 72, and corrects this summation by adding the signal corrective signal from the controller 58.
  • the summing circuit 64 then produces a signal from this summation to control the servo- This is accomplished by the liquid and gas fuel flow meter assemblies 20, 22 transmitting their signals through signal lines 80, 82, respectively, to the summing circuit 64.
  • the opacimeter assembly 36 senses the amount of the unburned solids to indicate the combustion of the liquid fuel.
  • the analyzer assembly 46 along with the optional analyzer assembly 44 senses the amount of unburned gas fuel. These analyzer signals are transmitted to the selector circuit 54 and from it to the controller 58 as described with reference to FIG. 4.
  • the controller 58 transmits its signal to the summing circuit 64 where it is algebraically added to the liquid fuel flow, gas fuel flow and air flow signals to provide a control signal for adjusting the servomechanism 28.
  • This control signal is amplified by the amplifier 76 and transmitted directly to the servomechanism to adjust it accordingly.
  • liquid fuel and gas fuel is burned in separate burners and the air flow rate is controlled by two separate networks.
  • the control network for the liquid fuel includes a summing circuit 96 which algebraically adds the liquid fuel flow, sensed by the flow meter 20, and the corrected air flow sensed by a flow meter 84.
  • the summing circuit 96 transmits a control signal through an output line to an amplifier 104 which amplifies the control signal and transmits it, through an output line 108, to a servo-mechanism 112.
  • the servo-mechanism 112 adjust the liquid fuel excess air flow accordingly.
  • the air flow signal is corrected before entering the summing circuit 96 by a summing circuit 92.
  • the air flow signal is transmitted to the summing circuit 92 through a signal line 88.
  • the circuit 92 also receives a signal from the opacimeter controller 48a through the output line 52a. These two signals are algebraically added and transmitted to the summing circuit 96 through an output line 93.
  • the control network for the gas fuel is analogous to the liquid fuel network and includes a summing circuit 98 which algebraically adds the gas fuel flow, sensed by the flow meter 22, and the corrected air flow, sensed by a flow meter 86.
  • the summing circuit 98 transmits a control signal through an output line 102 to an amplifier 106 which amplifies the control signal and transmits it, through an output line 110, to a servo-mechanism 114.
  • the servo-mechanism 114 adjusts the gas fuel excess air flow accordingly.
  • the air flow signal is corrected by a summing circuit 94.
  • the air flow signal is transmitted to the summing circuit 94 through a signal line 90.
  • the circuit 94 also receives 5 signal from the gas analyzer controller 58. These two signals are algebraically added and transmitted to the summing circuit 98 through an output line 95.
  • This second control network operates independently of the first.
  • a control network for simultaneous burning of liquid and gaseous fuels in a furnace under reduced excess air conditions comprising:
  • servo-mechanism means for controlling the combustion air supplied to the combustion air inlet of said furnace
  • selector circuit means for transmitting the higher signal output of either said first or second controller means to said servo-mechanism means to vary the combustion air according to the higher signal to assure burning of the liquid and gaseous fuels.
  • said first sensing means includes an opacimeter for producing a signal which is a function ofthe capacity of the substances exhausting from the flue of said furnace blackened by unburned hydrocarbons of the fuel burned.
  • a control network for simultaneous burning of liquid and gaseous fuels in a furnace under reduced excess air conditions comprising;
  • servo-mechanism means for controlling the combustion air supplied to the combustion air inlet of said furnace
  • second means for sensing and signaling the amount of unburned gases exhausting from the flue of said furnace that characterize gaseous fuel combustion quality
  • selector circuit means for monitoring and transmitting the higher signal sensed by said first and second sensing means
  • controller means having a reference signal that reflects a condition of complete fuels combustion with minimum excess air for producing a control signal to regulate said servo-mechanism means, said control signal being a function of the difference between the transmitted signal of said selector circuit means and the reference signal of said controller means.
  • said controller means reference signal is set to be identical to the output signals of said first and second sensing means under proper combustion conditions.
  • a control network for simultaneous burning of liquid and gaseous fuels in a furnace under reduced excess air conditions comprising in order to minimize heat loss and heat exchanger corrosion:
  • servo-mechanism means for controlling the combustion air supplied to the combustion air inlet of said furnace; first means for signaling the amount of unburned solids exhausting from the flue of said furnace that characterize liquid fuel combustion quality;
  • selector circuit means for transmitting the higher signal of said first and second signaling means; controller means having a reference signal that reflects a condition of complete fuels combustion with minimum excess air and heat exchanger corrosion for producing an output signal which is a function of the difference between the transmitted signal of said selector circuit means and the reference signal ofsaid controller means; third means for signaling the amount of at least one of the fuels flowing in the fuel inlet of said furnace; fourth means for signaling the amount of air flowing in the combustion air inlet of said furnace; and,
  • summing circuit means for algebraically adding said third signaling means signal to the output signal of said controller means and said fourth signaling means signal to produce an output signal forcontrolling said servo-mechanism.
  • a control network as set forth in claim 8 including an amplifying means for the output signal of said summing circuit means.
  • a control network for burning liquid fuel and gaseous fuel in the same furnace under reduced excess air conditions comprising:
  • servo-mechanism means for controlling the amount of combustion air flowing in the liquid and gaseous fuel associated air inlets of said furnace; first means for signaling the amount of unburned residue exiting from the flue of said furnace; second means for signaling the amount of combustion air flowing in the air inlets of said furnace;
  • summing circuit means for algebraically adding the signals from said first, second and third signaling means to produce output signals suitable for controlling said servo-mechanism means;
  • said first signaling means includes an opacimeter signaling the amount of unburned solids exiting from the flue of said furnace that characterize liquid fuel combustion and a gas analyzer signaling the amount of unburned gases exiting from the flue of said furnace that characterize gaseous fuel combustion;
  • said second signaling means includes a first and second air flow meter signaling the rate of air flow to the fuel associated air inlets of said furnace;
  • said third signaling means includes a liquid fuel flow meter and a gaseous fuel flow meter signaling the rate of flow of the respective fuels;
  • said servo-mechanism means includes a first servomechanism controlling the air flow in the liquid fuel associated air inlet and a second servomechanism controlling the air flow in the gaseous fuel associated air inlet of said furnace; and, v
  • said summing circuit means includes a first summing circuit adding the signals from the liquid fuel flow meter, the opacimeter and the first air flow meter to control the first servomechanism and adjust the liquid fuel excess air flow, and a second summing circuit adding the signals from the gaseous fuel flow meter, the gas analyzer and the second air flow meter to control the second servo-mechanism and adjust the gas fuel excess air flow thereby.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
US00146669A 1970-05-26 1971-05-25 Control network for burning fuel oil and gases with reduced excess air Expired - Lifetime US3723047A (en)

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861855A (en) * 1973-12-19 1975-01-21 B S C Ind Corp Automatic combustion control
US3973898A (en) * 1973-12-19 1976-08-10 Seymour Seider Automatic combustion control with improved electrical circuit
US4043743A (en) * 1976-08-09 1977-08-23 B.S.C. Industries Corporation Combustion control system
DE2745459A1 (de) * 1976-12-14 1978-06-15 Measurex Corp Einrichtung zur steuerung des verbrennungswirkungsgrades
WO1980001603A1 (en) * 1979-01-31 1980-08-07 Jydsk Varmekedelfab As Method and apparatus for regulating the combustion in a furnace
US4235171A (en) * 1978-12-21 1980-11-25 Chevron Research Company Natural draft combustion zone optimizing method and apparatus
US4237825A (en) * 1978-11-06 1980-12-09 Combustion Engineering, Inc. Furnace heat absorption control
US4253404A (en) * 1980-03-03 1981-03-03 Chevron Research Company Natural draft combustion zone optimizing method and apparatus
US4278050A (en) * 1979-04-24 1981-07-14 Kime Wellesley R Rapid response steam generating apparatus
US4315730A (en) * 1979-02-09 1982-02-16 Telegan Limited Burner control system
US4316420A (en) * 1978-11-06 1982-02-23 Combustion Engineering, Inc. Furnace heat absorption control
FR2493475A1 (fr) * 1980-11-03 1982-05-07 Econics Corp Procede et appareil de commande de l'alimentation en air et en combustible d'un processus de combustion, en fonction du taux de monoxyde de carbone ou d'hydrocarbures non brules ou de l'opacite des gaz d'echappement
US4359950A (en) * 1980-10-03 1982-11-23 Measurex Corporation Method for maximizing the reduction efficiency of a recovery boiler
US4362499A (en) * 1980-12-29 1982-12-07 Fisher Controls Company, Inc. Combustion control system and method
US4439138A (en) * 1978-06-12 1984-03-27 Aqua-Chem, Inc. Combustion control apparatus
US4471738A (en) * 1982-09-13 1984-09-18 Emission Control Systems, Inc. Method and apparatus for minimizing the fuel usage in an internal combustion engine
US4531905A (en) * 1983-09-15 1985-07-30 General Signal Corporation Optimizing combustion air flow
US4575334A (en) * 1982-11-01 1986-03-11 The Babcock & Wilcox Company Loss minimization combustion control system
US4576570A (en) * 1984-06-08 1986-03-18 Republic Steel Corporation Automatic combustion control apparatus and method
WO1991000978A1 (de) * 1989-07-07 1991-01-24 Forschungsgesellschaft Joanneum Gmbh Vorrichtung zur regelung von feuerungsanlagen
US20030223071A1 (en) * 2002-05-30 2003-12-04 Florida Power & Light Company Systems and methods for determining the existence of a visible plume from the chimney of a facility burning carbon-based fuels
US20110300494A1 (en) * 2010-06-04 2011-12-08 Maxitrol Company Control system and method for a solid fuel combustion appliance
WO2016104383A1 (ja) * 2014-12-25 2016-06-30 富士電機株式会社 燃焼制御装置、燃焼制御方法、燃焼制御プログラムおよびコンピュータ読み取り可能な記録媒体
US20170038092A1 (en) * 2014-10-21 2017-02-09 Testo Ag Method for adjusting a heating system, exhaust measuring device, and adjustment arrangement
US20170321896A1 (en) * 2016-05-04 2017-11-09 Elwha Llc Managing emission produced by a combustion device
US20180094809A1 (en) * 2016-09-30 2018-04-05 Siemens Aktiengesellschaft Regulating Turbulent Flows
US10234139B2 (en) 2010-06-04 2019-03-19 Maxitrol Company Control system and method for a solid fuel combustion appliance
US11022305B2 (en) 2010-06-04 2021-06-01 Maxitrol Company Control system and method for a solid fuel combustion appliance

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ES460107A1 (es) * 1976-06-28 1978-08-16 Claeys Flandria Nv Perfeccionamientos en los procedimientos y dispositivos paramantener practicamente constante a diversos regimenes de funcionamiento el rendimiento de aparatos a evacuacion for- zada comportando un dispositivo de combustion.
DE2950689A1 (de) * 1979-12-17 1981-06-25 Servo-Instrument, in Deutschland Alleinvertrieb der BEAB-Regulatoren GmbH u. Co KG, 4050 Mönchengladbach Regelvorrichtung fuer die verbrennungsluftmenge einer feuerstaette

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US2762568A (en) * 1953-09-08 1956-09-11 Bailey Meter Co Gas analysis and combustion control apparatus
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US3369748A (en) * 1965-08-14 1968-02-20 Bailey Controle Combustion control system

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US2762568A (en) * 1953-09-08 1956-09-11 Bailey Meter Co Gas analysis and combustion control apparatus
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US3369748A (en) * 1965-08-14 1968-02-20 Bailey Controle Combustion control system

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861855A (en) * 1973-12-19 1975-01-21 B S C Ind Corp Automatic combustion control
US3973898A (en) * 1973-12-19 1976-08-10 Seymour Seider Automatic combustion control with improved electrical circuit
US4043743A (en) * 1976-08-09 1977-08-23 B.S.C. Industries Corporation Combustion control system
DE2745459A1 (de) * 1976-12-14 1978-06-15 Measurex Corp Einrichtung zur steuerung des verbrennungswirkungsgrades
US4162889A (en) * 1976-12-14 1979-07-31 Measurex Corporation Method and apparatus for control of efficiency of combustion in a furnace
US4439138A (en) * 1978-06-12 1984-03-27 Aqua-Chem, Inc. Combustion control apparatus
US4316420A (en) * 1978-11-06 1982-02-23 Combustion Engineering, Inc. Furnace heat absorption control
US4237825A (en) * 1978-11-06 1980-12-09 Combustion Engineering, Inc. Furnace heat absorption control
US4235171A (en) * 1978-12-21 1980-11-25 Chevron Research Company Natural draft combustion zone optimizing method and apparatus
US4330260A (en) * 1979-01-31 1982-05-18 Jorgensen Lars L S Method and apparatus for regulating the combustion in a furnace
WO1980001603A1 (en) * 1979-01-31 1980-08-07 Jydsk Varmekedelfab As Method and apparatus for regulating the combustion in a furnace
US4315730A (en) * 1979-02-09 1982-02-16 Telegan Limited Burner control system
US4278050A (en) * 1979-04-24 1981-07-14 Kime Wellesley R Rapid response steam generating apparatus
US4253404A (en) * 1980-03-03 1981-03-03 Chevron Research Company Natural draft combustion zone optimizing method and apparatus
US4359950A (en) * 1980-10-03 1982-11-23 Measurex Corporation Method for maximizing the reduction efficiency of a recovery boiler
US4360336A (en) * 1980-11-03 1982-11-23 Econics Corporation Combustion control system
FR2493475A1 (fr) * 1980-11-03 1982-05-07 Econics Corp Procede et appareil de commande de l'alimentation en air et en combustible d'un processus de combustion, en fonction du taux de monoxyde de carbone ou d'hydrocarbures non brules ou de l'opacite des gaz d'echappement
US4362499A (en) * 1980-12-29 1982-12-07 Fisher Controls Company, Inc. Combustion control system and method
US4471738A (en) * 1982-09-13 1984-09-18 Emission Control Systems, Inc. Method and apparatus for minimizing the fuel usage in an internal combustion engine
US4575334A (en) * 1982-11-01 1986-03-11 The Babcock & Wilcox Company Loss minimization combustion control system
US4531905A (en) * 1983-09-15 1985-07-30 General Signal Corporation Optimizing combustion air flow
US4576570A (en) * 1984-06-08 1986-03-18 Republic Steel Corporation Automatic combustion control apparatus and method
WO1991000978A1 (de) * 1989-07-07 1991-01-24 Forschungsgesellschaft Joanneum Gmbh Vorrichtung zur regelung von feuerungsanlagen
US20030223071A1 (en) * 2002-05-30 2003-12-04 Florida Power & Light Company Systems and methods for determining the existence of a visible plume from the chimney of a facility burning carbon-based fuels
US7161678B2 (en) * 2002-05-30 2007-01-09 Florida Power And Light Company Systems and methods for determining the existence of a visible plume from the chimney of a facility burning carbon-based fuels
US9803862B2 (en) * 2010-06-04 2017-10-31 Maxitrol Company Control system and method for a solid fuel combustion appliance
US20110300494A1 (en) * 2010-06-04 2011-12-08 Maxitrol Company Control system and method for a solid fuel combustion appliance
US11022305B2 (en) 2010-06-04 2021-06-01 Maxitrol Company Control system and method for a solid fuel combustion appliance
US10234139B2 (en) 2010-06-04 2019-03-19 Maxitrol Company Control system and method for a solid fuel combustion appliance
US20170038092A1 (en) * 2014-10-21 2017-02-09 Testo Ag Method for adjusting a heating system, exhaust measuring device, and adjustment arrangement
CN106796029A (zh) * 2014-12-25 2017-05-31 富士电机株式会社 燃烧控制装置、燃烧控制方法、燃烧控制程序及计算机可读存储介质
JPWO2016104383A1 (ja) * 2014-12-25 2017-04-27 富士電機株式会社 燃焼制御装置、燃焼制御方法および燃焼制御プログラム
WO2016104383A1 (ja) * 2014-12-25 2016-06-30 富士電機株式会社 燃焼制御装置、燃焼制御方法、燃焼制御プログラムおよびコンピュータ読み取り可能な記録媒体
US20170321896A1 (en) * 2016-05-04 2017-11-09 Elwha Llc Managing emission produced by a combustion device
US20180094809A1 (en) * 2016-09-30 2018-04-05 Siemens Aktiengesellschaft Regulating Turbulent Flows
US11175039B2 (en) * 2016-09-30 2021-11-16 Siemens Aktiengesellschaft Regulating turbulent flows

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