• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:AT510075A1
    申请号:T0115510
    申请日:2010-07-08
    公开日:2012-01-15
    发明作者:
    申请人:Vaillant Group Austria Gmbh；
    IPC主号:
    专利说明:

    Vaillant Group Austria GmbH AT 4307
    The invention relates to a method for calibrating a device for controlling the fuel gas-air ratio of a combustion gas-powered burner.
    Such means for controlling the fuel gas / air ratio are known, for example, from EP 1 179 159 B1, EP 1 084 369 B1 and EP 1 082 575 B1. All these systems have in common that a fuel gas line opens into a combustion air line via a throttle. Between the fuel gas line and the combustion air line or a reference point in the device housing, a differential pressure sensor is arranged in the form of a mass flow sensor. The system is designed so that in the case in which the sensor is flowed through, the fuel gas or combustion air mass flow is changed until the sensor is no longer flowed through.
    These systems reliably control the fuel gas / air ratio with a known, constant fuel gas quality. When installing a device with such a regulation, however, a Erstkalibrierung on the fuel gas is necessary. If the fuel gas composition changes, for example as a result of variations in the quality of natural gas or liquefied petroleum gas, the fuel gas / air ratio also changes, which the known devices can neither detect nor compensate for. Therefore, according to the prior art, at start-up, the fuel gas-air ratio is set by "| * »* * * • II · · · · · ·« i «· · * * * · 2 i i t» · «* >
    Measurement of the oxygen or carbon dioxide content in the exhaust gas measured and calibrated by changing the throttle cross-section.
    It is known from EP 770 824 B1 that the fuel gas / air ratio of a combustion gas operated burner can be adjusted by measuring the ionization voltage or the ionization current at a monitoring electrode. Starting from a superstoichiometric burner operation, the excess air is reduced until there is a slight substoichiometric combustion. In this case, the ionization voltage between an ionization electrode and the burner is measured. At stoichiometric combustion (λ = 1.0) the ionisation voltage is maximal. Consequently, the ionization voltage, starting from superstoichiometric combustion, initially increases in the reduction of the excess air in order to reach a maximum under stoichiometric combustion. If the ionization voltage drops as the proportion of air continues to decrease, this is an indicator that the combustion is substoichiometric. The method known from EP 770 824 B1 now provides that, starting from the amount of air present at maximum ionization voltage, the proportion of air is increased by a defined amount, so that the setpoint air ratio is reached. This can be done, for example, by increasing the speed of a combustion air blower by 25%, based on the stoichiometric combustion. Embodiments of such a control method are known from DE 40 27 090 C2, DE 196 18 573 C1 and US 5,971,745 A.
    Patent Application AT 505 442 A1 discloses a calibration method in which, during operation of the burner, for example by increasing the rotational speed of a combustion air blower, the fuel gas-air mixture is emaciated, thereby continuously measuring the signal of the ionization electrode and in this case forming the gradient of the signal of the ionization electrode becomes. If a certain gradient is exceeded or if the gradient rises disproportionately, the lean-burn of the fuel gas / air
    Mixture finished and the fuel gas-air mixture defined enriched. This can be done, for example, by reducing the rotational speed of a combustion air blower by 25%, based on the rotational speed at the end of the leaning.
    The invention has for its object to provide a method for calibrating a device for controlling the fuel gas-air ratio of a gas-powered burner with differential pressure sensor between fuel gas and combustion air line without oxygen or carbon dioxide measurement of the exhaust gas.
    The object is achieved in that in a fuel gas burner with differential pressure, mass or flow sensor between fuel gas and combustion air line during operation of the burner, the fuel gas-air mixture is emaciated and in this case the ionization signal is measured continuously. From the ionization signal a gradient is formed during the change. If the gradient exceeds a certain value, or if the gradient rises disproportionately in comparison with the previous curve, the leaning is ended and the fuel gas / air mixture is enriched in a defined manner. In this state, the signal of the differential pressure, mass or volume flow sensor is measured , In the case in which the sensor flows through or is subjected to a differential pressure, the control device must be readjusted. For this purpose, the fuel gas flow is changed by changing the diameter or any other change in the resistance of the throttle.
    Advantageous embodiments will become apparent according to the features of the dependent claims.
    The change in diameter or other change in the resistance of the throttle can be carried out step by step, with ionization calibration again after each step. The process is terminated as soon as after ionization calibration
    Messsigna! of the differential pressure sensor, volume flow sensor or mass flow sensor falls below a predetermined limit. Alternatively, the method is terminated only after a lonisationskalibrierung the measurement signal of the differential pressure sensor, flow sensor or mass flow sensor falls below a predetermined limit and then a change in diameter or other change in the resistance of the throttle continuously until the measurement signal of the differential pressure sensor, flow sensor or mass flow sensor balanced pressure , or no volume or mass flow indicates.
    According to another option, the diameter change or other change in the resistance of the throttle takes place until the measuring signal of the differential pressure sensor, volume flow sensor or mass flow sensor indicates a balanced pressure or no volume or mass flow.
    The measurement signal of the ionization signal measurement is highly dependent on deposits on the electrode and the position of the electrode. Therefore, it is not appropriate to use exceeding or falling below a certain absolute value as a relevant event. The sharp increase in the gradient, on the other hand, is a sure sign that the flame will soon lift off as the proportion of air increases further.
    The gradient can be determined by dividing the difference signal of the ionization electrode with the differential speed of the fan motor. Alternatively, a division of the difference signal of the ionization electrode with the difference adjustment position of the actuator of a gas valve or a differential time unit can take place.
    The signal of the ionization electrode can be detected by connecting a constant voltage source to the burner flame and a resistor in series, and measuring the voltage drop across the resistor.
    The invention will now be explained in detail with reference to FIGS. Show here
    Figure 1 shows a structure for carrying out the method according to the invention and
    Figure 2 shows the course of the lonisationssignals as a function of excess air or the fan speed.
    1 shows a burner 1 with blower 8 with blower motor 9 in an air inlet 12. In the air inlet 12 opens a gas line 13, in which a gas valve 10 with actuator 11 and a throttle 15 with actuator 16 is located. The blower motor 9 and the actuator 11 of the gas valve 10 and the actuator 16 of the throttle 15 are connected to a controller 7. Between the gas line 13 and the air inlet 12 is a differential pressure sensor 14, which is also connected to the controller 7. The burner 1 is a flame 2, in which an ionization electrode 3 protrudes. The ionization electrode 3 is connected to a voltage source 4. This is connected to its second electrode with a resistor 5, which in turn is connected to the burner 1. Parallel to the resistor 5, a voltmeter 6 is connected, which is connected to the controller 7.
    During operation of the burner, the fan 8 sucks in combustion air via the air inlet 12. The speed n of the fan 8 can be adjusted continuously. The actuator 16 of the throttle 15, preferably a stepper motor, remains in a constant position, so that the throttle has a constant cross-section. About the gas valve 10, the amount of fuel gas supplied, which flows in via the gas line 13, are changed continuously; In this case, the number of steps ns of the actuator 11 is detected. In the fan 8, fuel gas and air are mixed with each other and ignited at the outlet of the burner 1, so that a flame 2 is formed. During normal burner operation, equal pressures should be applied to both sides of the differential pressure sensor 14. Depending on the power requirement, the controller 7 controls the blower motor 9. The controller 7 adjusts the actuator 11 of the gas valve 10 such that equal pressures are applied to both sides of the differential pressure sensor 14.
    Since the ions of the flame 2 are electrically conductive, a current can flow between the ionization electrode 3 and the burner 1. It follows that an electric voltage UFiamme is present. The ion flux through the flame 2 ensures that the electrical circuit (burner 1, ionization electrode 3, voltage source 4, resistor 5) is closed.
    FIG. 2 shows the profile of the voltage U measured at the resistor 5 via the air ratio λ and the fan speed n. U0 is the voltage of the voltage source 4. The following applies: U - Uq - Upiamme
    It can be seen that the voltage U measured at the resistor 5 is minimal at stoichiometric combustion (λ = 1.0). As the excess air increases, the voltage U increases continuously. With an air ratio of about 1.6, the voltage U increases significantly more than before. At an air excess of about λ = 1.7, the flame rises. It is no longer possible to measure an ionization signal; via a safety device, e.g. the gas valve 10 locks the fuel gas supply.
    In the calibration method according to the invention, the burner 1 first runs with a previously unknown excess of air. At constantly open gas valve 10, the speed n of the blower 8 is increased. As a result, the air ratio λ increases. The voltage drop U across the resistor 5 is measured continuously over the time t and passed on to the controller 7. In regulation 7, the gradient AULAN is calculated. If the gradient increases, it will decrease At a certain point, this is an indication that the flame will soon lift off and thus break off. The air ratio λ is then about 1.6. Starting from this point, the speed n of the fan is now specifically reduced such that an air ratio λ * 1.25 sets. The air ratio is not measured in this case, but rather the speed is defined defined according blower characteristic, so that a corresponding reduction of the air mass flow is expected. This process is called ionization calibration. In the case of the quantity of air reduced in this way, the signal of the differential pressure sensor 14 in the control unit 7 is now evaluated. If the sensor signal shows that the differential pressure sensor 14 is at the same pressure on both sides, the throttle 15 is set optimally. However, if it shows that the pressure on the fuel gas side is higher than on the combustion air side, this means that the burner for setting the desired target air ratio of λ = 1.25 more gas must be supplied, as with the activation of the constant pressure control over the differential pressure sensor is the case. Therefore, the cross section of the throttle 15 is increased by adjusting the actuator 16, so that more fuel gas flows upon activation of the constant pressure control. If the pressure on the fuel gas side is lower than on the combustion air side, the cross section of the throttle 15 is reduced by adjusting the actuator 16 so that less fuel gas flows upon activation of the constant pressure control.
    After a defined cross-sectional change (e.g., 10 steps of the stepper motor of the actuator 16 or number of steps as a function of the pressure difference), ionization calibration is again performed. After this ionization calibration, an adjustment of the cross-section of the throttle 15 is optionally carried out again. Ionization calibration and adaptation of the cross section of the throttle 15 are repeated until the signal of the differential pressure sensor 14 falls below a predetermined limit value. Here, optionally, the cross-sectional change (e.g., the number of steps of the stepper motor of the actuator 16) may become smaller and smaller so that the adjustment is coarse and then more and more accurate. Also optionally, in the case in which the signal of the differential pressure sensor 14 falls below a predetermined limit, the throttle cross-section be changed until equal pressures applied to both sides of the differential pressure sensor.
    Alternatively, after the first ionization calibration, the throttle cross-section can be changed as long as the same pressures are present on both sides of the differential pressure sensor.
    In the ionization calibration, a gradient from differential voltage AU to differential setting position of the actuator Ans can be formed alternatively to the gradient determination by means of quotient difference signal to differential speed AU / An, if instead of an increase in the fan speed, a reduction of the fuel gas quantity is made. As a further variant, a gradient from the time can also be formed with constant leaning (ΔÜ).
    The operating state in which liftoff is imminent may be determined by comparing the current gradient to at least one previous gradient, and in the event that the current gradient exceeds the comparison value (s) by a certain percentage, the expected state is present. For example, the lowest measured gradient can be used as the comparison value. Alternatively, an absolute value can be specified.
    In order to eliminate the influence of signal noise (fluctuation of the measuring signal by a trend line), the time difference or speed difference must not be selected too small.
    Instead of the voltage drop U at the resistor 5, the voltage of the flame UFiamm "can also be measured directly. In this case, however, the ionization voltage at stoichiometric combustion is maximum and the ionization voltage signal drops as the air ratio is increased.
    Instead of a constant voltage U0, a constant current source with a constant current I0 can also be connected to the series connection of the resistor 5 to the flame 2. Depending on the flame resistance, a certain voltage sets.
    权利要求:
    Claims (7)
    [1]
    1. A method for calibrating a device for controlling the fuel gas-air ratio of a combustion gas burner with a combustion air line and a fuel gas line, which ends via a throttle in the combustion air line, and a differential pressure sensor (14), volume flow sensor or Mass flow sensor between the fuel gas line and the combustion air line or a reference point at which there is a pressure dependent on the combustion air flow, and an ionization electrode (3), by means of which an ionization or ionization between the flame and a reference, preferably mass, is measured, characterized that the resistance or internal cross section of the throttle (15) is variable, during the operation of the burner (1) an ionization carried out, in which the fuel gas-air mixture emaciated while the signal of the ionization (3) kontin is measured, in this case the gradient of the signal of the ionization (3) is formed in excess of a certain gradient or disproportionate rise of the gradient, the leaning of the fuel gas-air mixture is terminated and the fuel gas-air mixture is enriched defined, then the signal of the differential pressure sensor, volume flow sensor or mass flow sensor is measured, in the case in which the sensor is flowed or acted upon in the direction of combustion air line, the fuel gas flow increased by increasing the diameter or other reduction of the resistance of the throttle or in the case where Sensor is flowed through or acted upon in the direction of fuel gas line, the fuel gas stream is reduced by reducing the diameter or other increase in the resistance of the throttle.
    [2]
    2. A method for calibrating a device for controlling the fuel gas-air ratio of a gas-powered burner according to claim 1, characterized in that the change in diameter or other change in the resistance of the throttle takes place gradually, after each step again a lonisationskalibrierung takes place and the process is terminated as soon as the measurement signal of the differential pressure sensor, volume flow sensor or mass flow sensor falls below a predetermined limit after ionization calibration, a change in diameter or other change in the resistance of the throttle continuously until the measurement signal of the differential pressure sensor, volume flow sensor or mass flow sensor indicate a balanced pressure or no volume or mass flow isplays.
    [3]
    3. A method for calibrating a device for controlling the fuel gas-air ratio of a fuel gas burner according to claim 1, characterized in that the change in diameter or other change in the resistance of the throttle takes place until the measurement signal of the differential pressure sensor, • Φ · · 44 «; * * · * · Φ * · · · · * * I * · · * * *: :: ::; , : ": * 3: »· · · * * * * flow rate sensor or mass flow sensor indicates a balanced pressure or no volume or mass flow.
    [4]
    4. A method for calibrating a device for controlling the fuel gas-air ratio of a gas-powered burner according to one of claims 1 to 3, characterized in that the air via a blower (8) with a blower motor (9) is promoted and the gradient of the signal the ionization electrode (3) is determined from the division of the difference signal of the ionisation electrode (3) with the differential rotational speed of the fan motor (9).
    [5]
    5. A method for calibrating a device for controlling the fuel gas-air ratio of a gas-powered burner according to one of claims 1 to 4, characterized in that the fuel gas via a gas valve (10) with actuator (11) is passed and the gradient of the signal the ionization electrode (3) is determined from the division of the difference signal of the ionization electrode (3) with the difference position of the actuator (11).
    [6]
    6. A method for calibrating a device for controlling the fuel gas-air ratio of a combustion gas burner according to one of claims 1 to 5, characterized in that the gradient of the signal of the ionization electrode (3) from the division of the difference signal of the ionisation (3) the difference time is determined.
    [7]
    7. A method for calibrating a device for controlling the fuel gas-air ratio of a fuel gas burner according to one of claims 1 to 6, characterized in that a constant voltage source (4) or constant current source with the flame (2) of the burner (1) and a Resistor (5) is connected in series and is measured as a signal of the ionization electrode (3), the voltage drop across the resistor (5).
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    同族专利:
    公开号 | 公开日
    EP2405198B1|2013-02-20|
    EP2405198A1|2012-01-11|
    ES2403338T3|2013-05-17|
    AT510075B1|2012-05-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102019110977A1|2019-04-29|2020-10-29|Ebm-Papst Landshut Gmbh|Method for checking a gas mixture sensor in a fuel gas operated heater|DE4027090C2|1990-08-28|1998-07-23|Kromschroeder Ag G|Arrangement for monitoring a burner flame|
    EP0770824B1|1995-10-25|2000-01-26|STIEBEL ELTRON GmbH & Co. KG|Method and circuit for controlling a gas burner|
    AU710622B2|1995-11-13|1999-09-23|Gas Research Institute, Inc.|Flame ionization control apparatus and method|
    DE19618573C1|1996-05-09|1997-06-26|Stiebel Eltron Gmbh & Co Kg|Gas burner regulating method controlled by ionisation electrode signal|
    DE19639487A1|1996-09-26|1998-04-09|Honeywell Bv|Method and device for optimizing the operation of a gas burner|
    DE19824524C2|1998-06-02|2002-08-08|Honeywell Bv|Control device for gas burners|
    DE19824521B4|1998-06-02|2004-12-23|Honeywell B.V.|Control device for gas burners|
    DE19922226C1|1999-05-14|2000-11-30|Honeywell Bv|Control device for gas burners|
    DE10319835A1|2003-01-10|2004-11-11|Vaillant Gmbh|Control method for fuel-driven burner, involves performing calibrating procedure during start of burner operation by increasing the fuel-air mixture until an exhaust sensor outputs a signal equivalent to an established threshold value|
    DE10236979C1|2002-08-13|2003-08-14|Stiebel Eltron Gmbh & Co Kg|Combustion regulation method for IC engine employs switching function for providing calibration phase, regulation phase and engine cold-starting phase|
    AT504887B1|2007-04-02|2008-09-15|Vaillant Austria Gmbh|METHOD FOR FILLING LEVEL MONITORING OF A LIQUID GAS TANK|
    AT505442B1|2007-07-13|2009-07-15|Vaillant Austria Gmbh|METHOD FOR FUEL GAS AIR ADJUSTMENT FOR A FUEL-DRIVEN BURNER|EP2682679B1|2012-07-04|2017-08-30|Vaillant GmbH|Method for monitoring a gas fuelled burner|
    US9528712B2|2012-11-05|2016-12-27|Pat Caruso|Modulating burner system|
    法律状态:
    2017-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20160708 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1155/2010A|AT510075B1|2010-07-08|2010-07-08|METHOD FOR CALIBRATING A DEVICE FOR CONTROLLING THE COMBUSTION AIR-AIR CONDITION OF A FUEL-DRIVEN BURNER|ATA1155/2010A| AT510075B1|2010-07-08|2010-07-08|METHOD FOR CALIBRATING A DEVICE FOR CONTROLLING THE COMBUSTION AIR-AIR CONDITION OF A FUEL-DRIVEN BURNER|
    EP11005288A| EP2405198B1|2010-07-08|2011-06-29|Method for the calibration of the regulation of the fuel-air ratio of a gaseous fuel burner|
    ES11005288T| ES2403338T3|2010-07-08|2011-06-29|Procedure for the calibration of the regulation of the proportion of combustion gas-air of a burner driven by combustion gas|
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