• 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:AT510002A4
    申请号:T0209110
    申请日:2010-12-20
    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 PT 5066 AT
    Method for controlling a gas / air mixture
    The invention relates to a method for controlling the gas / air mixture in fully premixing gas burners.
    A generic fully premixing burner is known from DE 199 22 226 C1. With fully premixing burners, an ignitable air-fuel gas mixture is initially provided by means of a mixing device, which is then fed via a blower to a burner for combustion. The fuel gas is then removed in a chimney to the environment.
    In the mixing device, the gas flow is adjusted in dependence on the combustion air pressure. The mixing device described in DE 199 22 226 C1 measures the differential pressure between fuel gas upstream of the main quantity throttle and the combustion air. The pressure difference is adjusted to zero.
    According to the state of the art, control and measuring devices with low dynamics are used both for the regulation and for the measurement of the pressure difference. This is due to the fact that the parameters of the air supply and the combustion process change only relatively slowly.
    However, there is a risk that pressure fluctuations can be caused by unstable combustion processes and gusts in the chimney. These pressure fluctuations are to be avoided in particular at low modulation rates of the burner, since with superimposed pressure fluctuations, the resulting flow velocities can become too small, so that it can come through the burner nozzles to a flashback. The risk of flashback is increased at a device start with a cold mixture and a cold combustion chamber before, since then unstable combustion processes are favored.
    It is therefore an object of the invention to provide a method for controlling the gas / air mixture on fully premixing burners, wherein the risk of flashback or flame loss is reduced,
    This object is achieved by a method according to claim 1. For this purpose, the said process steps are carried out periodically. First, with a high sampling rate, the pressure difference between the air supply and the gas supply is measured with a mixer suitable for detecting the pressure difference. This can be a measuring device that directly measures the pressure difference, two separate ones with devices for air supply and gas supply with subsequent difference of the measured values or a measuring device for detecting the mass flow of a connection between gas supply and air supply.
    The measured values are now processed in parallel on two signal processing branches. In the first branch, first a low-pass filtering of the measured values takes place. This low-pass filtering can be based on a general suitable signal processing algorithm known from the literature, such as, for example, moving averaging or first or higher order low-pass. According to the invention, this low-pass filtering can also be carried out analogously by an RC element or by the natural inertia of the measuring system. On the basis of these low-pass filtered measured values, the gas valve is turned on by means of a regulator
    controlled, that the pressure difference, which is determined by low-pass filtered measured values, is compensated to zero. This happens because if the pressure on the side of the gas line is too high, the regulator closes the gas valve and vice versa. In addition, the scatter of the measured values is determined in a second signal processing algorithm. Here, too, different algorithms are available, for example subtraction of the maximum value and minimum value, standard deviation, formation of the magnitude of the high-pass filtered signal, and so on. The value of the scattering determined in this way is compared to a reference value previously determined by measurement or calculation by means of subtraction, and as soon as the value exceeds the reference value by a specific threshold value for a specific time, the manipulated variables of the gas valve and / or the blower are intervened. A high scatter of the measured values is an indication that there are pressure fluctuations due to unstable combustion processes or wind-induced pressure fluctuations. These pressure fluctuations entail the risk of flame retardation, of flame loss or of increased CO formation in the burner and can be minimized by the method according to the invention.
    Preferably, the reference value is determined in a separate calibration cycle with stable flame and calm. This can be done in the factory for the individual device or for the device series and / or during commissioning and / or during maintenance of the device.
    Particularly preferably, the reference value is stored as a function of the Gebiäsedrehzahl. Again, the reference value can be determined by a calibration cycle with variable speed.
    This threshold value can either be additively added as a constant to the reference value or added as a value proportional to the reference value, for example as a percentage value. The reference value is preferably dependent on the fan speed.
    In a development, the threshold value or a parameter which determines the threshold value can be set, for example by means of one or more configuration values which can be set by means of a user interface.
    Particularly preferably, the threshold value is dynamically adjusted during operation of the gas burner. Thus, for example, a frequent disturbance, which is triggered by a too sensitive setting of the threshold value or by a too restrictive specification of the reference value, can be avoided by a long-term increase of the threshold value.
    According to the invention, after detection of a threshold exceeded, several possibilities are provided for intervention in the manipulated variables of the gas valve and / or the blower in the combustion process. Since the risk of flashback at low flow velocities is particularly high, in a variant of the method, the minimum permissible fan speed is increased. This has an influence on the modulation behavior of the gas burner.
    In another variant of the method, the mixing ratio of the gas / air mixture is changed within narrow limits, which are predetermined by a clean and efficient combustion by the gas valve is slightly opened or closed.
    The previously described interventions into the manipulated variables are made and increased continuously until the determined spread falls below the threshold value. Preferably, however, until the determined scattering comes below a second threshold value, which is below the first threshold value. As a result, a hysteresis is realized which prevents the manipulated variables from constantly fluctuating.
    In a development of the invention, the method is supplemented by the fact that the intervention in the manipulated variables is reversed if the comparison of the scattering with the reference. value falls below a third Schwellwerl. This third threshold may be less than the second threshold. However, it may also be useful to select the third threshold identical to the first or second threshold and thus to achieve a continuous control of the flame stability. In the event that the intervention in the manipulated variables within the permissible limits does not lead to a reduction of the dispersion below the threshold values, an error status is triggered which leads for example to a shutdown of the gas burner or to an error message.
    The invention will now be explained in detail with reference to FIGS.
    It shows:
    Figure 1: a gas burner for carrying out the method according to the invention.
    FIG. 1 shows a fully premixing gas burner with a fan connected upstream of the burner. Air is supplied to a blower 1 via an air supply 5 and gas to a mixing device 3 via a gas supply 6, mixed and burned in a burner 2 in a combustion chamber 12. The exhaust gases are discharged via a chimney 4 to the environment. The air supply 5 and the gas supply 6 each have an orifice 10 and 11, which are set so that at the same pressures is an optimal for combustion air / gas mixture. To ensure this, a measuring device 7 is provided, which is connected via connecting lines with the air supply and the gas supply and measures the differential pressure between gas and air. This can be done by pressure measurement, differential pressure measurement or a measurement of the mass flow in a connecting line. The measuring device 7 forwards the measured value to a controller 9, which controls the gas valve 8 in a first signal processing branch in such a way that the differential pressure measured by the measuring device 7 is regulated to zero. In a second signal processing branch, the scattering of the measured values of the measuring device 7 determined, compared with a reference value and when a threshold value is exceeded, the setting of the gas valve in a small limits, which are set by an optimal combustion changed. At the same time or alternatively, the limit value for the minimum speed with which the blower 1 is operated is increased.
    The scattering of the measured values indicates unstable flame conditions, which are caused by gusts of wind in the chimney 4 or unfavorable combustion parameters and, in particular with cold combustion chamber 12 and at low flow velocities due to the vibrations, can lead to flashback, flame loss or increased CO values. This is prevented by the method according to the invention.
    Thus, for example, the method according to the invention can cause it to be recognized on a windy day that the scattering of the measured values exceeds the reference value plus a predefined first threshold value. The minimum speed of the blower 1 is now increased stepwise until the scatter of the measured values falls below the reference value plus a predetermined second threshold value, which may be less than the first threshold value. If the dispersion of the measured values falls below the reference value plus a predetermined third threshold, which is less than the second threshold value, the intervention in the manipulated variable "minimum speed of the blower Τ 'is canceled again. This occurs when the gusts subside. Alternatively or additionally, the method is also on the position of the gas valve 8, which is opened or closed to a small extent in the context of clean combustion.
    In a preferred embodiment of the method, the scattering of the pressure difference is determined before the burner start and made an intervention in the control variables of the gas valve and / or the blower according to the method described above, when the reference value is exceeded by a threshold value.
    LIST OF REFERENCE NUMERALS 1 blower 2 burners 3 mixing device 4 chimney 5 air supply 6 gas supply 7 measuring device 8 gas valve 9 regulator 10 air restrictor 11 gas restrictor 12
    combustion chamber
    权利要求:
    Claims (13)
    [1]




    1. Method for regulating the gas / air mixture by means of a mixing device (3) with fully premixing gas burners with a blower (1) upstream of the burner (2), wherein the mixing device (3) comprises a measuring device (3). 7) suitable for detecting the pressure difference between air and gas supply (5, 6), wherein the mixing device (3) comprises an adjustable gas valve (8) and wherein the mixing device (3) comprises a regulator (9) connected to the measuring device (7) and to the gas valve (8) and the blower (1), characterized by the cyclical steps - measuring the pressure difference at a high sampling rate, - determining the scatter of the measured values, - low-pass filtering of the measured values, Activating the gas valve in such a way that the pressure difference represented by the low-pass filtered measured values is corrected to zero, - Comparison of the dispersion with a stored ref value, - intervention in the manipulated variables of the gas valve and / or the fan when the reference value is exceeded by a threshold value.
    [2]
    2. The method according to claim 1, characterized in that the reference value is previously determined and stored in a separate calibration cycle with stable flame and calm.
    [3]
    3. The method according to claim 1 or 2, characterized in that the reference value is stored depending on the fan speed.
    [4]
    4. The method according to any one of the preceding claims, characterized in that the threshold value is stored as a constant or as a magnitude proportional to the magnitude of the reference value and / or dependent on the fan speed size.
    [5]
    5. The method according to claim 4, characterized in that the threshold value or a threshold value influencing parameter is adjustable.
    [6]
    6. The method according to claim 4, characterized in that the threshold value is dynamically adjusted during operation of the gas burner.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the intervention in the control variables is that the stored value of the minimum allowable fan speed is increased.
    [8]
    8. The method according to any one of claims 1 to 6, characterized in that the intervention in the manipulated variables is that the gas valve is opened or closed within a permissible range for clean combustion. · »· · ·» · · * ♦ • * '· J · · · • t · * "··" · 4 * »« «v« · • * *' # '· 4 · · · ·
    [9]
    9. The method according to any one of the preceding claims, characterized in that the intervention takes place in the manipulated variables as long and repeated until the result of the comparison of the scattering with a reference value has fallen below the threshold value, preferably has fallen below a second, smaller threshold value.
    [10]
    10. The method according to any one of the preceding claims, characterized in that the intervention in the manipulated variables is reversed again if the result of the comparison of the scattering with the reference value has fallen below a third, preferably smaller threshold value.
    [11]
    11. The method according to any one of the preceding claims, characterized in that an error status is triggered when the manipulated variables have reached predetermined limits.
    [12]
    12. The method according to any one of the preceding claims, characterized in that the method step "comparison of the scattering with a reference value" and / or the step "intervention in the manipulated variables" is performed at a lower frequency than the method step "measuring the pressure difference".
    [13]
    13. The method according to any one of the preceding claims, characterized in that additionally immediately before the start of the burner, the steps - measuring the pressure difference at a high sampling rate, - determining the dispersion of the measured values, - Comparison of the scattering with a stored reference value, - intervention in the Manipulated variables of the gas valve and / or the blower, when the reference value is exceeded by a threshold, are performed.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0578578A1|1992-07-10|1994-01-12|Selas Corporation Of America|Apparatus and method for mixing gases|
    EP0806610A2|1996-05-09|1997-11-12|STIEBEL ELTRON GmbH & Co. KG|Method and device for operating a gas burner|
    EP1186831A1|2000-09-05|2002-03-13|Siemens Building Technologies AG|Apparatus controlling the air/fuel ratio of a burner|EP2623865A1|2012-02-03|2013-08-07|Honeywell Technologies Sarl|Gas burner, method for operating the same and multi gas burner system|
    ITPD20120030A1|2012-02-09|2013-08-10|Sit La Precisa S P A Con Socio Uni Co|METHOD FOR THE CONTROL OF A BURNER OF A BOILER AND CONTROL SYSTEM OPERATING IN ACCORDANCE WITH THIS METHOD|
    EP2966354A1|2014-07-08|2016-01-13|Honeywell Technologies Sarl|Method and controller for operating a gas burner|
    US10247416B2|2015-03-23|2019-04-02|Honeywell Technologies Sarl|Method for operating a gas burner|US4334855A|1980-07-21|1982-06-15|Honeywell Inc.|Furnace control using induced draft blower and exhaust gas differential pressure sensing|
    DE9310451U1|1993-03-05|1994-06-30|Landis & Gyr Business Support|Control device for automatic gas firing systems for heating systems|
    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|
    DE10025769A1|2000-05-12|2001-11-15|Siemens Building Tech Ag|Control device for a burner|EP2682679B1|2012-07-04|2017-08-30|Vaillant GmbH|Method for monitoring a gas fuelled burner|
    EP2829803B1|2013-07-25|2017-05-10|Honeywell Technologies Sarl|Method of stabilizing gas burner combustion using Fast-Fourier-Transformation |
    DE102015117406A1|2015-10-13|2017-04-13|Ebm-Papst Landshut Gmbh|Control device for gas burners|
    US10274195B2|2016-08-31|2019-04-30|Honeywell International Inc.|Air/gas admittance device for a combustion appliance|
    法律状态:
    2016-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20151220 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT0209110A|AT510002B1|2010-12-20|2010-12-20|METHOD FOR REGULATING A GAS / AIR MIXTURE|AT0209110A| AT510002B1|2010-12-20|2010-12-20|METHOD FOR REGULATING A GAS / AIR MIXTURE|
    ES11009679T| ES2702709T3|2010-12-20|2011-12-09|Procedure for the regulation of a gas / air mixture|
    EP11009679.9A| EP2466202B1|2010-12-20|2011-12-09|Method for regulating a gas/air mixture|
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