GB2185810A - Methods of and apparatus for regulating the amounts of gas and air for gas blower burners - Google Patents

Methods of and apparatus for regulating the amounts of gas and air for gas blower burners Download PDF

Info

Publication number
GB2185810A
GB2185810A GB08701170A GB8701170A GB2185810A GB 2185810 A GB2185810 A GB 2185810A GB 08701170 A GB08701170 A GB 08701170A GB 8701170 A GB8701170 A GB 8701170A GB 2185810 A GB2185810 A GB 2185810A
Authority
GB
United Kingdom
Prior art keywords
air
gas
combustion
amount
supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08701170A
Other versions
GB8701170D0 (en
GB2185810B (en
Inventor
Jacques Van Heijningen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Building Technologies AG
Landis and Gyr AG
Original Assignee
Landis and Gyr AG
LGZ Landis and Gyr Zug AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Landis and Gyr AG, LGZ Landis and Gyr Zug AG filed Critical Landis and Gyr AG
Publication of GB8701170D0 publication Critical patent/GB8701170D0/en
Publication of GB2185810A publication Critical patent/GB2185810A/en
Application granted granted Critical
Publication of GB2185810B publication Critical patent/GB2185810B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/26—Measuring humidity
    • F23N2225/30—Measuring humidity measuring lambda
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • 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
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Landscapes

  • 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)

Abstract

The composition of the mixture of combustion gas and air, which is to be supplied to the gas blower burner, is regulated so that the amount of air is determined by the level of load, but the amount of combustion gas is determined not just by the amount of air but also in accordance with the parameters which influence and/or characterise the quality of combustion. Apparatus for carrying out the method includes a pressure divider 9 for varying the pressure effective at the control input 8 of a ratio regulator 5. That pressure is varied on the basis of the signal from a probe 15 for detecting the parameters which influence or which characterise the quality of combustion, by way of an auxiliary regulator 13. Such parameters are the level of oxygen in the flue gas, the level of flame ionisation, and the temperature of the supply air. <IMAGE>

Description

SPECIFICATION Methods of and apparatus for regulating the amounts of gas and air for gas blower burners The present invention relates to methods of and apparatus for regulating the amounts of gas and air for gas blower burners, and in particular for regulating the mixture of combustion gas and air which is to be supplied to such burners in which the supply of air is regulated in accordance with the level of load and the supply of gas is dependent on the supply of air.
Such methods and apparatus are disclosed in German Patent Application Publication No.
DE-A-2 834 342. The supply of gas in that disclosed arrangement is adjusted in dependence on the supply of air in such a way that, under part-load conditions, the arrangement maintains that composition of the mixture which was previously set when adjusting the arrangement to full load operation, in respect of optimum composition of the mixture. In that respect no account is taken of the fact that the calorific value of the combustion gas and thus its oxygen requirement can fluctuate, and likewise with regard to the effectiveness of the combustion air, for example by virtue of the fact that the amount of oxygen per unit of volume varies in dependence on the temperature of the air.Thus, that arrangement does not guarantee either complete utilisation of the calorific value of the combustion gas, nor the attainment of waste gases which have the minimum possible content of noxious substances therein.
According to one aspect of the invention there is provided a method of regulating the composition of a mixture of combustion gas and air which is to be supplied to a gas blower burner, wherein the supply of air is regulated in accordance with the level of load and the supply of gas is dependent on the supply of air, and wherein the ratio of the amount of combustion gas and the amount of air is varied in accordance with the parameters which influence the quality of combustion and/or which characterise the quality of combustion.
According to another aspect of the invention there is provided apparatus for regulating the combustion of a mixture of combustion gas and air which is to be supplied to a gas blower burner, wherein the supply of air is regulated in accordance with the level of load and the supply of gas is dependent on the supply of air, the apparatus comprising means for varying the ratio of the amount of combustion gas and the amount of air in accordance with the parameters which influence the quality of combustion and/or which character ise the quality of combustion.
A preferred embodiment of the present invention provides a method and apparatus in which parameters which affect the quality of combustion are detected and the ratio of the amount of combustion gas and the amount of air is varied in a simple manner in such a way that complete utilisation of the calorific value of the combustion gas is attained as well as the discharge of waste gas which has the minimum possible content of noxious substances, in all load ranges of the burner.
This technique is based on the fundamental consideration that the amount of gas may not be adjusted solely on the basis of the amount of air, but that essential parameters which influence the quality of combustion or which are characteristic of the quality of combustion must be detected. The ratio of the amount of combustion gas and the amount of air can be varied in accordance with those parameters.
If ratio regulator is to be used for controlling the gas pressure in dependence on the pressure of the combustion air supplied to the burner, then the pressure of the combustion air, acting on the gas pressure regulator, must be varied in accordance with the parameters.
That may be achieved in a simple manner by connecting between the air line and the ratio regulator a pressure divider which includes a throttle, an auxiliary valve and a drive means for the auxiliary valve. The parameters which influence the quality of combustion or which are characteristic of the quality of combustion act by way of an auxiliary regulator on the drive means for the auxiliary valve, and in that way vary the air pressure which acts on the ratio regulator.
Basic setting of the ratio regulator in this arrangement is such that the ratio of the gas pressure to the air pressure is at least as great as the greatest ratio of the gas pressure to the air pressure, which occurs over the working range of the burner, at the respective optimum condition of combustion. The variation in the air pressure acting on the ratio regulator, by means of the auxiliary valve, then reduces the gas pressure from that greatest value of the ratio, to the value which is just required having regard to the respective load in question.
The temperature of the feed air and the calorific value of the combustion gas, for example, are taken into consideration as essential parameters which influence the quality of combustion. The higher the temperature of the supply air, the lower is the amount of oxygen contained in the air per unit of volume thereof. In order to achieve optimum combustion, the amount of combustion gas must therefore be decreased with increasing air temperature.
The calorific value of the combustion gas represents the most essential controlling parameter in accordance with which the ratio of the amount of combustion gas and the amount of air would have to be regulated. As simple, continuously operating measuring devices are not available for determining the calorific value of a combustion gas, it is desirable, instead of the calorific value of the combustion gas, to refer to such parameters for regulating the ratio of the amount of combustion as and the amount of air, which characterise the quality of combustion.
The use of a known oxygen probe makes it possible to regulate the amount of combustion gas in relation to the amount of air in such a way that the waste gas has an oxygen excess which characterises the minimum possible content of noxious material in the waste gas.
The magnitude of the excess of oxygen can be kept constant.
However, an improvement in the method provides that the excess of oxygen in the waste gas is not kept constant but is in turn varied in accordance with the level of the load of the burner. This provides for more substan tial minimisation of the content of noxious substances.
Instead of measuring the oxygen content in the waste gas, or alternatively also in addition thereto, it is possible to measure the ionisation of the flame and to use such measurement for regulating the ratio of the amount of combustion gas and the amount of air.
The invention will now be described, by way of illustrative and non-limiting example, with reference to the accompanying single figure drawing which shows a block diagram of a regulating apparatus.
The preferred apparatus uses an oxygen probe for regulating the ratio of the amount of combustion gas and the amount of air.
Referring to the drawing, a burner 1 is supplied with combustion gas by way of a gas line 2 and with air which is compressed by means of a blower 4, by way of an air line 3.
A ratio regulator 5 of known construction is included in the gas line 2. Provided in the air line 3 is an air flap 6 which, in order to control the level of loading, is actuated by an output regulator 7 by way of an air flap drive means (not shown). A pressure divider 9 is disposed between the air line 3 and a control connection 8 of the ratio regulator 5. The pressure divider 9 includes a throttle 10, an auxiliary valve 11 and a drive means 12 for operating the auxiliary valve 11. In this arrangement, the throttle 10 is disposed in the connection between the air line 3 and the control connection 8, while the input side of the auxiliary valve 11 is connected to the connection between the throttle 10 and the control connection 8, and its output side is connected to the ambient atmosphere. The drive means 12 is operatively connected to an auxiliary regulator 13.Installed in a waste gas line 14 which is connected to the burner 1 is an oxygen probe 15 providing an output signal which is transmitted to the auxiliary regulator 13. The auxiliary regulator 13 converts that signal into a position signal supplied to the drive means 12. In addition, a control line 16 may be provided between the regulator 7 and the auxiliary regulator 13. The regulator 7 communicates the level of load to the auxiliary regulator 13 by way of the control line 16 so that the auxiliary regulator 13 is capable of taking account of the level of loading when forming the position signal for the drive means 12 of the auxiliary valve 11.
The apparatus shown in the drawing operates in the following manner. The blower 4 produces a flow of air which is sufficiently large to provide the amount of air required for the maximum output of the burner 1. In accordance with the actual output requirement, the regulator 7 generates a position signal for the air flap 6, according to which the flow of air is controlled in accordance with the actual output requirement. In this way, an air pressure is produced in the air line 3 which is related to the level of loading and which acts by way of the throttle 10 on the control input 8 of the ratio regulator 5, and in known manner determines the pressure in the gas line 2 and thus the amount of combustion gas which is to flow to the burner 1.In that connection, the setting of the throttle 10 and the regulator 5 is such that, when the auxiliary valve 11 is closed, the amount of gas regulated by the ratio regulator 5 is at least slightly greater than that which corresponds to the amount of gas associated with the amount of air passing through the system, under optimum combustion conditions. If the burner 1 was operated in such a manner, then the oxygen probe 15 disposed in the gas line 14 would detect that there is no excess of oxygen. Then, by virtue of the signal from the oxygen probe 15, the auxiliary regulator 13 would derive a positional signal for the drive means 12 which acts on the auxiliary valve 11, from the difference between the reference value and the actual value, and thus open the auxiliary valve 11 in accordance with the deviation in respect of the actual value. Due to the auxiliary valve 11 being opened, the pressure which is effective at the control input 8 of the ratio regulator 5 falls, with the result that the pressure in the gas line 2 and thus the amount of combustion gas flowing to the burner 1 drops. That therefore provides a regulating circuit which always keeps the amount of gas precisely at a value such that the waste gas has an excess of oxygen which is determined in accordance with the reference value introduced into the auxiliary regulator 13. In that connection, the auxiliary regulator 13 must be such that it takes account of the properties of the regulating section with regard to its regulating performance, which is to be achieved in accordance with algorithms known in respect of regulating techniques.
Instead of the oxygen probe 15, it is possible to use an ionisation probe, and such an ionisation probe could also be used in addition to the oxygen probe 15. When using an ionisation probe, the auxiliary regulator 13 must be of a suitable design in order to be able to convert the signals produced by the ionisation probe into positional orders for the drive means 12.
Instead of the oxygen probe 15 or in addition thereto, it is also possible to use a probe for sensing the temperature in the air line 3, the probe being operatively connected to the auxiliary regulator 13.
In all such embodiments of the invention, there is no change in the pressure divider 9 with all its elements which determine the action thereof, the throttle 10, the auxiliary valve 11 and the drive means 12.
The drive means 12 may be of an electrothermal, electric-motor or electromagnetic type, being for example in the form of a moving magnet system. It is advantageous, with regard to the electric-motor and the electromagnetic drive means, that such drive means should react very quickly and have virtually no influence on the time parameters of the regulating section. An electro-thermal drive means may also be advantageous when, on the basis of the design concerned, the time parameters theeof are to be matched to the performance in respect of time of the other parts of the regulating section.

Claims (16)

1. A method of regulating the composition of a mixture of combustion gas and air which is to be supplied to a gas blower burner, wherein the supply of air is regulated in accordance with the level of load and the supply of gas is dependent on the supply of air, and wherein the ratio of the amount of combustion gas and the amount of air is varied in accordance with the parameters which influence the quality of combustion and/or which characterise the quality of combustion.
2. A method according to claim 1, wherein the ratio of the amount of combustion gas and the amount of air is varied by an output signal of a probe for measuring the concentration of oxygen in the waste gas.
3. A method according to claim 1, wherein the ratio of the amount of combustion gas and the amount of air is varied by an output signal of a probe for measuring ionisation of the flame of the burner.
4. A method according to claim 1, wherein the ratio of the amount of combustion gas and the amount of air is varied by an output signal of a probe for measuring the temperature of the supply air.
5. Apparatus for regulating the composition of a mixture of combustion gas and air which is to be supplied to a gas blower burner, wherein the supply of air is regulated in accordance with the level of load and the supply of gas is dependent on the supply of air, the apparatus comprising means for varying the ratio of the amount of combustion gas and the amount of air in accordance with the parameters which influence the quality of combustion and/or which characterise the quality of combustion.
6. Apparatus according to claim 5, comprising regulating means with which the supply of gas which is dependent on the supply of air by means of a ratio regulator is additionally made dependent on parameters which influence the quality of combustion and/or which are characteristic of the quality of combustion.
7. Apparatus according to claim 6, wherein, connected between an air line and a control connection of the ratio regulator for regulating the amount of combustion gas in accordance with the amount of air, is a pressure divider which produces the variation in the air pressure acting on the control input of the ratio regulator by an auxiliary regulator whch acts on the pressure divider converting the signal of at least one probe for detecting the parameters which influence or which characterise the quality of combustion, into a position signal for the pressure divider.
8. Apparatus according to claim 7, wherein the pressure divider comprises a throttle, an auxiliary valve and a drive means for actuating the auxiliary valve.
9. Apparatus according to claim 8, wherein the drive means is an electric-motor drive.
10. Apparatus according to claim 8, wherein the drive means is an electromagnetic drive.
11. Apparatus according to claim 8, wherein the drive means is an electro-thermal drive.
12. Apparatus according to any one of claims 9 to 11, wherein the auxiliary regulator derives the control signal for the drive means from an output signal of an oxygen probe which is incorporated into the exhaust gas line.
13. Apparatus according to any one of claims 9 to 11, wherein the auxiliary regulator derives the control signal for the drive means from an output signal of a probe which is arranged in the air line and which senses the temperature of the air.
14. Apparatus according to any one of claims 9 to 11, wherein the auxiliary regulator derives the control signal for the drive means from an output signal of an ionisation probe.
15. Apparatus for regulating the composition of a mixture of combustion gas and air which is to be supplied to a gas blower burner, the apparatus being substantially as hereinbefore described with reference to the accompanying drawing.
16. A method of regulating the composition of a mixture of combustion gas and air which is to be supplied to a gas blower burner, the method being substantially as hereinbefore described with reference to the accom panying drawing.
GB8701170A 1986-01-28 1987-01-20 Methods of and apparatus for regulating the amounts of gas and air for gas blower burners Expired GB2185810B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH314/86A CH668825A5 (en) 1986-01-28 1986-01-28 METHOD AND DEVICE FOR GAS-AIR QUANTITY CONTROL FOR GAS BLOWING BURNER.

Publications (3)

Publication Number Publication Date
GB8701170D0 GB8701170D0 (en) 1987-02-25
GB2185810A true GB2185810A (en) 1987-07-29
GB2185810B GB2185810B (en) 1989-11-01

Family

ID=4184181

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8701170A Expired GB2185810B (en) 1986-01-28 1987-01-20 Methods of and apparatus for regulating the amounts of gas and air for gas blower burners

Country Status (4)

Country Link
CH (1) CH668825A5 (en)
DE (1) DE3607386A1 (en)
GB (1) GB2185810B (en)
NL (1) NL8700202A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5106294A (en) * 1988-04-16 1992-04-21 Conel Ag Method and arrangement for reducing the effect of disturbances on the combustion of a fan burner system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818265A1 (en) * 1988-05-28 1989-11-30 Wolfgang Weinmann Controller for a heating system
DE3834850A1 (en) * 1988-10-13 1990-04-19 Kloeckner Humboldt Deutz Ag Fuel feed for a regeneration burner of a diesel particle filter
AT396822B (en) * 1990-03-21 1993-12-27 Vaillant Gmbh Ignition and/or regulation method
DE4206377A1 (en) * 1992-02-29 1993-09-02 Neumann Siegmar Control of air flow to blowpipes in forced-air oil or gas burner - using pressure sensors in exhaust and sondes for gas content coupled to computer controlling variable speed fan
DE4343306A1 (en) * 1993-12-17 1995-06-22 Gastechnic Prod Vertriebges Gas pipeline pressure regulation system
DE102017222437A1 (en) * 2017-12-12 2019-06-13 Robert Bosch Gmbh Heater component and method for adjusting a fuel flow rate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1565310A (en) * 1977-12-01 1980-04-16 Battelle Development Corp Method and apparatus for controlling fuel to oxidant ratioof a burner
EP0015480A2 (en) * 1979-03-02 1980-09-17 Ruhrgas Aktiengesellschaft Device for the regulation of gas-firing mixtures
EP0104586A2 (en) * 1982-09-23 1984-04-04 Honeywell Inc. Gas burner control system
US4576570A (en) * 1984-06-08 1986-03-18 Republic Steel Corporation Automatic combustion control apparatus and method
GB2177493A (en) * 1984-08-29 1987-01-21 John S West System and process for controlling the flow of air and fuel to a burner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI772751A (en) * 1976-12-14 1978-06-15 Measurex Corp EFFECTIVENESS AND EFFECTIVENESS OF EFFECTIVENESS FUNCTIONS
DE2834242A1 (en) * 1978-08-04 1980-02-14 Kromschroeder Ag G Blower type burner automatic regulator - controls gas and air supply to ensure optimum mixture composition over working range by air pressure sensor
DE3039994A1 (en) * 1980-10-23 1982-05-06 Karl Dungs Gmbh & Co, 7067 Urbach METHOD FOR SETTING COMPONENT CONTROLLERS FOR BURNERS IN HEAT GENERATING SYSTEMS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1565310A (en) * 1977-12-01 1980-04-16 Battelle Development Corp Method and apparatus for controlling fuel to oxidant ratioof a burner
EP0015480A2 (en) * 1979-03-02 1980-09-17 Ruhrgas Aktiengesellschaft Device for the regulation of gas-firing mixtures
EP0104586A2 (en) * 1982-09-23 1984-04-04 Honeywell Inc. Gas burner control system
US4576570A (en) * 1984-06-08 1986-03-18 Republic Steel Corporation Automatic combustion control apparatus and method
GB2177493A (en) * 1984-08-29 1987-01-21 John S West System and process for controlling the flow of air and fuel to a burner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WO 86/01581 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5106294A (en) * 1988-04-16 1992-04-21 Conel Ag Method and arrangement for reducing the effect of disturbances on the combustion of a fan burner system

Also Published As

Publication number Publication date
DE3607386C2 (en) 1990-06-13
DE3607386A1 (en) 1987-10-08
NL8700202A (en) 1987-08-17
GB8701170D0 (en) 1987-02-25
GB2185810B (en) 1989-11-01
CH668825A5 (en) 1989-01-31

Similar Documents

Publication Publication Date Title
US4396369A (en) Furnace air volume control apparatus
US4330260A (en) Method and apparatus for regulating the combustion in a furnace
EP2667097B1 (en) Method for operating a gas burner
KR900018632A (en) Nitrogen oxide emission control method and device by invalidation
KR890000342B1 (en) System for controlling combustion and o2 in the flue gases from combustion processes
EP0342347B1 (en) Method for reducing the effect of deregulating factors for ventilator burners and ventilator burners
GB2185810A (en) Methods of and apparatus for regulating the amounts of gas and air for gas blower burners
US4380400A (en) Combustible gas analyzer
US4083338A (en) Apparatus for controlling the fuel-air mixture of an internal combustion engine
CA1240916A (en) Gas burner
US20060292505A1 (en) System for controlling the delivery of a fuel gas to a burner apparatus
GB2114778A (en) Methods of and apparatus for controlling the residual oxygen content of waste gases of blower- type firing installations
US7335015B2 (en) Method for controlling or regulating a burner
US4167169A (en) Fuel flow control system
GB2036290A (en) Fuel sampling system
US4493635A (en) Oxygen-enriched air ratio control device for combustion apparatus
AU2020282377A1 (en) Improved gas burner for cooking appliances
KR20020032547A (en) Regulation method for gas burners
KR950014318A (en) Real time control method and apparatus of gas burner with variable characteristics, especially for metallurgy furnace
SU1748661A3 (en) Method of automatic optimization of processes of burning in thermal installation and system to implement it
US4075993A (en) Fuel mixture control apparatus
EP0323658A2 (en) Method for determining the wobbe number of a gas mixture
US4303194A (en) Smoke prevention apparatus
US4486165A (en) Combustion control apparatus of a combustion furnace
KR100804233B1 (en) Oxygen concentration control method in case of firing multiple fuels

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980120