EP1843094A1 - Heating device - Google Patents

Heating device Download PDF

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Publication number
EP1843094A1
EP1843094A1 EP07075259A EP07075259A EP1843094A1 EP 1843094 A1 EP1843094 A1 EP 1843094A1 EP 07075259 A EP07075259 A EP 07075259A EP 07075259 A EP07075259 A EP 07075259A EP 1843094 A1 EP1843094 A1 EP 1843094A1
Authority
EP
European Patent Office
Prior art keywords
pressure
internal
gauge
heating device
fan
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.)
Withdrawn
Application number
EP07075259A
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German (de)
English (en)
French (fr)
Inventor
Jan Aede Stapensea
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.)
Eco heating systems BV
Original Assignee
Eco heating systems BV
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 Eco heating systems BV filed Critical Eco heating systems BV
Publication of EP1843094A1 publication Critical patent/EP1843094A1/en
Withdrawn legal-status Critical Current

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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
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed
    • 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
    • F23N2233/08—Ventilators at the air intake with variable speed

Definitions

  • the invention relates to a heating device, such as a hot water boiler and/or a central heating boiler, comprising a fuel combustion chamber with a heat exchanger, an internal fuel supply conduit with a connection for an external fuel supply conduit, an internal air inlet conduit with a connection for an external air inlet pipe and an internal flue gas outlet pipe with a connection for an external flue gas outlet pipe, wherein a fan is placed in the internal air inlet pipe and/or in the internal flue gas outlet pipe.
  • a heating device such as a hot water boiler and/or a central heating boiler, comprising a fuel combustion chamber with a heat exchanger, an internal fuel supply conduit with a connection for an external fuel supply conduit, an internal air inlet conduit with a connection for an external air inlet pipe and an internal flue gas outlet pipe with a connection for an external flue gas outlet pipe, wherein a fan is placed in the internal air inlet pipe and/or in the internal flue gas outlet pipe.
  • the present invention relates particularly to the control of a heating apparatus, in particular a central heating boiler with a built-in fan, either for drawing in the combustion air or for extracting the flue gases.
  • the invention relates more particularly to a so-called premix combustion system.
  • a heating apparatus has a mixing device, wherein the correct amount of combustion air and a determined amount of gas are brought together before being carried to the burner and are fed in mixed form to the burner in the combustion chamber such that during the subsequent combustion process no further additional air is supplied or drawn in.
  • closed systems Such systems which are closed relative to the setup area are referred to as closed systems or space-independent systems. If deemed desirable however, air can under determined conditions be drawn in from the setup area instead of the air being drawn in from the outside atmosphere.
  • the system described here will preferably use as energy carrier fossil fuel in gas form, such as natural gas, propane, butane, or oil converted into gas form (injector) in a burner suitable for this purpose.
  • gas form such as natural gas, propane, butane, or oil converted into gas form (injector) in a burner suitable for this purpose.
  • the invention has for its object to keep the functioning and the energy capacity of the device as constant as possible during changing ambient factors, such as air pressure, ambient temperature and/or connection to diverse types, forms and lengths of inlet and outlet pipes.
  • the heating device is provided for this purpose with a pressure gauge which can measure the pressure or a change in the pressure at a location in the internal space formed by the internal air inlet pipe, the internal flue gas outlet pipe, the fuel combustion chamber and internal sub-spaces in the device in open connection therewith, or in the ambient air, and that the fan has a variable rotation speed, wherein the heating device is further provided with regulating means which can adjust the rotation speed of the fan subject to the measured pressure or the measured change in pressure.
  • the pressure gauge is a pressure difference gauge which can measure the pressure difference or a change in the pressure difference between the pressure at a location in the internal space formed by the internal air inlet pipe, the internal flue gas outlet pipe, the fuel combustion chamber and internal sub-spaces in the device in open connection therewith on the one hand and in the ambient air on the other, wherein regulating means can adjust the rotation speed of the fan subject to the measured pressure difference or the measured change in the pressure difference.
  • the pressure difference gauge preferably has a provision for giving one side thereof a fixed pressure value such that the pressure difference gauge can be used as pressure gauge which can measure the pressure or a change in the pressure in the internal space or in the ambient air, wherein the regulating means can adjust the rotation speed of the fan to the measured pressure or the measured change in pressure in the internal space.
  • the heating device is provided with an internal condensation outlet conduit for discharging condensation from the combustion chamber, which internal condensation outlet conduit is provided with a siphon and an opening for discharge to an external condensation outlet conduit, wherein said location of the pressure difference gauge is in the internal condensation outlet conduit or in the siphon such that, when the siphon or the condensation outlet conduit is blocked, the water level in the siphon rises rapidly to above the location of the pressure difference gauge, and wherein the regulating means are adapted to switch off the heating device at a pressure difference above a predetermined threshold value.
  • the heating apparatus is provided with a combustion space 1 in which is situated a heat exchanger (not shown) and in which is situated a burner 2 which is connected by means of a gas/air mixture inlet pipe 7 to an air inlet pipe 5 and a gas inlet pipe 6.
  • Air inlet pipe 5 comprises a pipe part which is present in the device and to which an external pipe of a desired length can be connected.
  • the gas and the air are mixed in a correct ratio and fed to burner 2 by means of a fan 4.
  • the gas/air mixture is converted into thermal energy by means of a burner 2. This energy is carried through the heat exchanger, wherein the resulting heat is relinquished to a medium for heating, preferably water or air.
  • the temperature of the medium is hereby increased, whereafter the combustion gases, the temperature of which has decreased due to this exchange, are carried via a pipe system 3 to the outside atmosphere.
  • the flue gas outlet pipe system 3 comprises a pipe part which is present in the device and to which an external pipe of a desired length can be connected.
  • this heat exchanger and the pipe system will provide an amount of resistance to throughflow of the flue gases.
  • This resistance can be overcome by applying a fan 4 with a correct pressure increase adjusted to this resistance such that sufficient pressure still remains, and such that the flue gases which have left the heat exchanger can be displaced through pipe system 3 to the outside atmosphere.
  • the temperature of the flue gases in the heat exchanger has a direct effect on the volume of the flue gases and therefore a direct effect on the resistance in the exchanger and the pipe system for the flue gases.
  • the air inlet pipe system 5 if present, will also have an amount of resistance which also has to be overcome by the pressure or underpressure of fan 4.
  • a fan 4 will therefore have to be chosen which has sufficient pressure to be able to overcome not only the resistance in combustion space 1 but also the resistance in inlet pipe system 5, 7 and the resistance in flue gas outlet system 3.
  • the location where a heating apparatus is placed is determined by local conditions, while the location where the flue gases can reach the outside atmosphere is regulated by national standards such as safety requirements, so that the length of pipe system 3 for the flue gases is not predictable.
  • the resistance in this pipe system 3 is therefore equally unpredictable and depends on, among other factors, the length, debouchment area, the diameter of the chosen pipe, the number of bends, the temperature of the through-flowing air or flue gases.
  • the volume to be transported depends on the placing of fan 4: in the combustion air or in the flue gases, and on the quantity of supplied energy in the form of the amount of gas or oil. Account has to be taken here of the maximum temperatures and design temperatures of the medium for heating.
  • the pressure to be provided by fan 4 must be determined empirically when fan 4 is arranged and tested under the above mentioned conditions.
  • the load of a heating apparatus indicates the amount of energy, stated in kilowatts [kW], supplied to the apparatus per unit of time.
  • the load multiplied by the efficiency of the apparatus results in the capacity, this being the amount of heat supplied to the medium for heating, likewise given in kW.
  • the load of a heating apparatus is determined by the amount of supplied energy, while the capacity is determined by multiplying the load by the efficiency of the heat exchange.
  • combustion must comply with legal requirements relating to CO (carbon monoxide) formation and possibly also the Nox (nitrogen oxide) formation. These requirements are laid down in CE norms and possibly supplemented by national regulations.
  • the inlet and outlet pipe system 3, 5 forms in this entity a quantity which is not known in advance. Every additional metre of pipe and every bend has a direct influence on the resistance of the overall system, and therefore likewise a direct influence on the amount of combustion air displaced by fan 4.
  • the maximal load may not be exceeded, though it may be reduced, so that these apparatus are only approved with a minimal pipe length and a maximum temperature of the medium for heating, so that the load only becomes lower when greater pipe lengths are applied.
  • Data are generally supplied in the technical specifications of such combustion devices from which it is possible to infer the decrease in load per metre of pipe length in the combustion air side and the decrease in load due to the length of pipes 3 in the flue gas outlet side.
  • the invention has in mind a device wherein the decrease in load resulting from the pipe length in the supply and discharge part is prevented or reduced.
  • a pressure difference gauge 8 is applied for this purpose.
  • the pressure difference meter consists for instance of a housing 9 with a membrane 10, which divides the housing into two parts, each half having an opening 11, 12 to the atmosphere.
  • Membrane 10 is coupled to a resistance strain gauge, known as a "thick film”. Placed on this resistance strain gauge are two ICs which measure the displacement of the strain gauge and, using a Wheatstone bridge, this displacement is amplified and converted into an electrical signal.
  • One of the atmospheric openings 11 of this pressure difference gauge 8 is connected to a location in the pipe system 3, 5, 7 or combustion chamber 1, where the change in pressure can be measured when longer pipes are connected to the apparatus.
  • a change in pressure is converted into an electrical analog or digital signal, and this signal is fed to an electronic control (not shown).
  • This electronic control converts the signal by means of a table incorporated in this control, and this results in a change of the rotation speed of the applied fan 4.
  • a first method of preventing a chain reaction is as follows according to the invention.
  • the resistance of the system is measured immediately at the initial rotation speed of fan 4 (this initial rotation speed is a fixed value and is stored in the memory of the control), even before the gas valve is opened, and compared to a predetermined resistance under nominal conditions.
  • These nominal conditions can be qualified as: a barometric pressure of 1013 mbar, an average heating medium temperature of 25°K above the indrawn air temperature, inlet and outlet pipe length each of 0.5 metre, and a diameter of the size of the connections of the apparatus. If a resistance is measured which is higher or lower than the determined nominal value, the initial rotation speed is adjusted.
  • the correction curve is in principle hereby shifted integrally upward or downward parallel to itself, so that at any other rotation speed, once the apparatus has been ignited, the measured variation is corrected. With a longer burning time of the apparatus, the apparatus can be turned off after a determined burning time, whereafter a restart can follow in order to determine a new correction.
  • a following method according to the invention for preventing a chain reaction is as follows. Under the stated nominal conditions the apparatus is placed at maximum capacity (burner 2 on) and the pressure is determined by gauge 8. The correction of the rotation speed takes place only when fan 4 of the apparatus connected to a given length of pipe and diameter has reached a rotation speed of for instance 95% (or other rotation speed higher than the initial rotation speed) or higher of the maximum rotation speed under nominal conditions. The pressure is herein determined and compared to the nominal pressure, and the rotation speed of fan 4 is corrected and this point is then fixed for this rotation speed. If as a result of modulation the rotation speed falls below this 95%, a switch is made to the normal ratio curve between rotation speed and load, wherein the correction is then omitted.
  • a fan 4 has a characteristic indicating the ratio between the rise height (pressure) and the displaced volume. This line is a logarithmic curve, although this logarithmic curve can be shifted in parallel if the rotation speed of fan 4 is changed.
  • the ratio between the load of a combustion apparatus and the rotation speed is practically a straight line, at least if no other constructions are applied to modify the form of this curve, as is the ratio between the change in resistance of a combustion device, including the connected pipes, and the change in the load resulting herefrom.
  • the relation between the additional resistance on a heating apparatus and the rotation speed has to be determined empirically per sort and type of apparatus.
  • the lines show the load in relation to the resistance in the heating apparatus and the rotation speed of the fan in relation to the resistance in the heating apparatus.
  • the line marked with squares in Figure 2 shows the decrease in load when there is no adjustment of the fan rotation speed.
  • the increase in resistance can be caused by an increase of the temperature in the apparatus or of the temperature of the indrawn air, or by lengthening of the air inlet pipe or the flue gas outlet pipe. The resistance is also increased if a smaller diameter of inlet pipe or outlet pipe is applied.
  • the line marked with triangles indicates the load when the fan rotation speed is adjusted to said increase in resistance as shown in Figure 3 by means of measurement by pressure gauge 8.
  • a subsequent method according to the invention is as follows. As soon as the resistance in the system consisting of combustion air inlet pipe 5, combustion chamber 1 and flue gas outlet pipe 3 changes, this is detected by pressure difference gauge 8. There occurs a difference between the pressure conduit 13 connected to the system and the other opening 12 of housing 9 of pressure difference gauge 8 which is connected to the outer atmosphere, and the rotation speed of fan 4 is changed via a ratio table. By changing the rotation speed the situation is restored to the situation before the resistance was increased. The decrease in load is hereby prevented.
  • HE high efficiency
  • This type of apparatus has to be provided with a siphon 14 for discharge of this condensation that can occur in combustion chamber 1 and flue gas outlet pipe 3.
  • This siphon 14 is connected directly to combustion chamber 1 and/or to flue gas outlet pipe 3.
  • pressure difference gauge 8 The location where pressure difference gauge 8 is connected is important in respect of the quantity to be measured. As stated, the inlet of the meter can be connected in pipe system 3, 7, 5 or combustion chamber 1, although the following conditions differ greatly and have a great influence on the gauge:
  • the gauge can in principle be connected to the pipe system 3 coming out of the exchanger, although this system can contain a rather large amount of moisture pressure due to condensation.
  • a pressure gauge 8 with membrane is generally very sensitive to condensation. It is therefore necessary to seek a location where this condensation is present to a small extent or not at all.
  • a siphon 14 is in any case connected to combustion chamber 1, and a possible second or third siphon can be connected to the flue gas outlet system 3 if this results in possible advantages.
  • the pressure in siphon 14 is determined by the resistance in outlet system 3. This pressure is a resultant of the throughflow volume of the flue gases, the length of outlet pipe 3 (including bends and the like) and the diameter.
  • the outlet 16 of siphon 14 is generally connected to the sewer, wherein installation requirements prescribe that there has to be an open connection between this siphon outlet 16 and the sewer in respect of blockage of this sewer or pressure increase therein.
  • installation requirements prescribe that there has to be an open connection between this siphon outlet 16 and the sewer in respect of blockage of this sewer or pressure increase therein.
  • condensation is first neutralized such that the pH content is brought to 5, this being between alkaline and acid.
  • outlet 16 of siphon 14 of the heating apparatus is blocked, whereby the level of the condensation water in siphon 14 rises, whereby the condensation cannot be removed from combustion chamber 1 and combustion chamber 1 can fill with condensation.
  • the fan rotation speed will increase by means of said table in the control.
  • This action can be advantageous since the pressure on siphon 14, and therefore on the blockage, will increase whereby the blockage is possibly ended. If this effect does not have the correct outcome, the pressure will begin to increase in magnitude by means of the fan 4, while the level of the condensation reaches the combustion chamber, which is not desirable.
  • a safeguarding action can also be initiated by means of the measured value of the pressure gauge: if the measured pressure becomes higher than a determined value, the heating apparatus is switched off via the control.
  • the air pressure decreases in accordance with a value which can be calculated, depending on the temperature: ( 273,15+15)-6.5*(height in metres)/1000. While the oxygen percentage at these greater heights does remain at 21%, the oxygen molecules will be at a greater distance from each other, so that less oxygen is supplied per unit of time. The outflowing gas will also be exposed to a lower pressure, whereby the gas molecules will also be a greater distance from each other, which results in a reduced oxygen and energy supply, and so a lower load.
  • connection of pressure gauge 8 is directly to siphon 14, or to the connection 15 between the heat exchanger and the siphon, or to a location at the air inlet pipe 5 or the flue gas outlet pipe 3, wherein the atmospheric opening 12 of pressure gauge 8 is closed, whereby a barometric influence can be measured in an apparatus at rest.
  • pressure gauge 8 has only one connection 11 intended for connection to the siphon, while the gauge is preprogrammed with a value equal to the atmospheric pressure of the atmosphere at 0 metre height - 1013 mbar.
  • This influence can be employed as an offset or a hysteresis for the fan rotation speed.
  • An automatic compensation of the load is hereby obtained when the apparatus is placed at a height other than sea-level.
  • a following embodiment relates to a pressure gauge 8 with closed atmospheric opening 12. This can be applied in the following situations.
  • an opening 11 of the pressure box of pressure gauge 8 is connected at the location where this change is recorded, while the other opening 12 is not connected but measures the atmospheric pressure.
  • this atmospheric measuring opening 12 is closed and replaced by a constant pressure, standard 1013 mbar, to enable the pressure difference to be measured with the atmospheric height.
  • the pressure gauge is compensated in respect of the atmospheric pressure, and there is only a reaction to the change in the increase or decrease of the apparatus and pipe resistance.
  • a pressure difference gauge 8 with a closed chamber having a fixed pressure of a nominal value of 1013 mbar is thus applied to keep the load of a heating apparatus constant, even if the apparatus is placed at great height, so at a lower atmospheric pressure, by measuring the atmospheric pressure in situ relative to said normal pressure of 1013 mbar.
  • a standard value of the pressure is determined under nominal conditions, though before fan 4 is started, as stated for instance at 1013 mbar, and the actual pressure is compared thereto and on the basis hereof the ratio curve between the rotation speed and the load is corrected - offset in parallel - and this is used as basis for a further correction on the basis of pressure differences.
  • Pressure gauge 8 with closed opening 12 has priority over the gauge with an open opening 12.
  • Pressure gauge 8 with closed opening 12 determines the basic rotation speed, on which the gauge 8 with open opening 12 superimposes as it were an offset to compensate the pressure of the resistance.
  • a bypass is present on or in pressure gauge 8, wherein before the apparatus (or fan 4) is started the pressure in the closed leg is compared in the first instance with the pressure in the open leg, whereafter the table of the fan rotation relative to the barometric pressure is loaded and the rotation speed is determined.
  • This signal is then blocked and after starting of the apparatus the opening 12 of pressure gauge 8 is opened to the atmosphere and the pressure of the atmosphere is measured relative to the pressure in the system, and the table is opened of the relation of the resistance of the system compared to the standard resistance, and the rotation speed is superimposed as offset rotation speed on the height rotation speed.
  • a combination can be achieved of measuring an absolute barometric pressure and the local pressure, and the rotation speed of fan 14 can hereby be adjusted in order to obtain a load equal to that at an atmospheric pressure of 1013 mbar, whereafter at startup of the apparatus this atmospheric pressure is replaced by the momentary pressure in the inlet and outlet system, which can represent the resistance of the system and with which the calculation can be made relating to the greater and lesser pressure compared to the nominal resistance and with which the rotation speed of fan 14 can be modified such that the load is set to the nominal value.
  • premix devices are preferably regulated as modulating devices: the load of the heating apparatus adapts to the heat demand by changing the capacity by means of adjusting the rotation speed. Not only is the amount of combustion air hereby changed but the energy supply of gas or oil in the same ratio, so that the quality of combustion remains at the same level.
  • the resistance in the inlet and outlet system is in squared relation to the rotation speed of fan 14 in respect of the load. If the resistance of the inlet and outlet system is increased by an increase or decrease in diameter of pipe system 3, 5 and by lengthening thereof, there will have to be a reaction hereto if the apparatus has a value other than the maximum load.
  • the diameter of the inlet and outlet system 3, 5 is however determined on the basis of the greatest flow rate of the flue gases: the maximum quantity. It is not therefore necessary to change the rotation speed of fan 14 within the modulation range: only above about 90% of the maximum capacity does the table with the load/resistance ratio have to become active. In addition, it is important to fix the measuring point of the pressure: if this is located after the exchanger, the resistance is determined solely by the resistance in the outlet system, and not by the load or modulation. If the resistance in this outlet system is higher than the standard resistance, the fan rotation speed is adjusted.
  • the apparatus Since the rotation speed of the fan in the nominal situation (outlet pipe 3 0.5 metre, inlet pipe 5 0.5 metre, combustion temperature 20°C) is determined by the manufacturer of the apparatus, the apparatus will be connected at an unknown location, with unknown height, with unknown barometric pressure and unknown outlet system 3, and be ignited for the first time. During this first use of the apparatus a pressure in outlet system 3 is measured which differs from the pressure under nominal conditions. At the moment the apparatus functions for the first time at a load of more than 95% the pressure in the system is measured. According to the ratio table of the changed pressure to rotation speed incorporated in the control, a changed rotation speed will result herefrom in order to keep the load constant. This initial value is stored as new default value. If after this initialization the pressure changes relative thereto, the rotation speed is constantly adjusted to maintain the load at the desired value.

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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)
EP07075259A 2006-04-05 2007-04-04 Heating device Withdrawn EP1843094A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1031520A NL1031520C2 (nl) 2006-04-05 2006-04-05 Verwarmingsinrichting.

Publications (1)

Publication Number Publication Date
EP1843094A1 true EP1843094A1 (en) 2007-10-10

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ID=37565148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07075259A Withdrawn EP1843094A1 (en) 2006-04-05 2007-04-04 Heating device

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EP (1) EP1843094A1 (nl)
NL (1) NL1031520C2 (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVR20110142A1 (it) * 2011-07-11 2013-01-12 Hottoh S R L Dispositivo di riscaldamento alimentato a pellet, biomassa e simili
ITPD20120030A1 (it) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co Metodo per il controllo di un bruciatore di una caldaia e sistema di controllo operante in accordo con tale metodo
EP2966354A1 (en) * 2014-07-08 2016-01-13 Honeywell Technologies Sarl Method and controller for operating a gas burner

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237665A (en) * 1989-10-31 1991-05-08 Potterton Int Ltd Boiler control
DE4319486C1 (de) * 1991-11-22 1995-03-09 Stork J E Ventilatoren Bv Heizungsvorrichtung
DE19639992A1 (de) * 1995-09-23 1997-03-27 Vaillant Joh Gmbh & Co Verfahren zum Steuern des Gasdurchsatzes
EP0857916A1 (de) * 1997-02-06 1998-08-12 Electrowatt Technology Innovation AG Steuer- und Regelgerät für einen Brenner
EP1219899A1 (en) * 2000-12-20 2002-07-03 Toyotomi Co., Ltd. Control system for combustion equipment
US6533574B1 (en) * 1998-03-06 2003-03-18 A Theobald Sa System for active regulation of the air/gas ratio of a burner including a differential pressure measuring system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237665A (en) * 1989-10-31 1991-05-08 Potterton Int Ltd Boiler control
DE4319486C1 (de) * 1991-11-22 1995-03-09 Stork J E Ventilatoren Bv Heizungsvorrichtung
DE19639992A1 (de) * 1995-09-23 1997-03-27 Vaillant Joh Gmbh & Co Verfahren zum Steuern des Gasdurchsatzes
EP0857916A1 (de) * 1997-02-06 1998-08-12 Electrowatt Technology Innovation AG Steuer- und Regelgerät für einen Brenner
US6533574B1 (en) * 1998-03-06 2003-03-18 A Theobald Sa System for active regulation of the air/gas ratio of a burner including a differential pressure measuring system
EP1219899A1 (en) * 2000-12-20 2002-07-03 Toyotomi Co., Ltd. Control system for combustion equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVR20110142A1 (it) * 2011-07-11 2013-01-12 Hottoh S R L Dispositivo di riscaldamento alimentato a pellet, biomassa e simili
ITPD20120030A1 (it) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co Metodo per il controllo di un bruciatore di una caldaia e sistema di controllo operante in accordo con tale metodo
WO2013117516A1 (en) * 2012-02-09 2013-08-15 Sit La Precisa S.P.A. Con Socio Unico A method for controlling a burner of a boiler and a control system operating according to this method
EP2966354A1 (en) * 2014-07-08 2016-01-13 Honeywell Technologies Sarl Method and controller for operating a gas burner

Also Published As

Publication number Publication date
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