EP3045816B1 - Device for the control of a burner assembly - Google Patents

Device for the control of a burner assembly Download PDF

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Publication number
EP3045816B1
EP3045816B1 EP15151600.2A EP15151600A EP3045816B1 EP 3045816 B1 EP3045816 B1 EP 3045816B1 EP 15151600 A EP15151600 A EP 15151600A EP 3045816 B1 EP3045816 B1 EP 3045816B1
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EP
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Prior art keywords
ionisation current
burner
ionisation
air volume
volume flow
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German (de)
French (fr)
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EP3045816A1 (en
Inventor
Thomas Born
Bernd Schmiederer
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Siemens AG
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Siemens AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00Subject-matter not provided for in other groups of this subclass
    • F23C99/001Applying electric means or magnetism to combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means

Description

  • The present disclosure relates to control curves, as used in connection with ionization in burner systems, for example in gas burners. In particular, the present disclosure relates to the correction of such control curves taking into account the aging and / or drift of a sensor signal.
  • In burner systems, the air ratio during combustion can be determined by means of an ionization current through an ionization electrode. An alternating voltage is first applied to the ionization electrode. Due to the rectifier effect of a flame, an ionization current flows as a direct current in only one direction.
  • In control curves for ionization electrodes, the ionization current detected at the ionization electrode is plotted against the speed of the fan of a gas burner. The ionization current is typically measured in microamps. The speed of the fan of a gas burner is typically measured in revolutions per minute. The speed of the fan of a gas burner is also a measure of the air volume flow and the performance of the burner system, that is, for a quantity of heat per time.
  • Along such a control curve, a plurality of test points is plotted. First of all, these test points can be included in tests under laboratory conditions. The recorded values are stored and taken into account in an (electronic) control.
  • Ionization electrodes are subject to aging during operation. This aging is caused by deposits and / or deposits during the operation of a burner system. In particular, an oxide layer can form on the surface of an ionization electrode whose thickness changes over the course of the operating hours. As a result of the aging of an ionization electrode, a drift of the ionization current occurs. Consequently, a control curve recorded under laboratory conditions requires a correction from time to time, at the latest after 1000 to 3000 operating hours.
  • A control device with correction of the control curve of an ionization electrode is disclosed in EP2466204B1 , The correction of the control curve takes place in three steps. First, the controller performs a regular operation. Subsequently, the control device controls or regulates the actuators of the burner system to a changed feed ratio. In particular, the speed of the fan of a burner system is changed. By controlling the actuators, the control device adjusts an air volume flow of the burner system.
  • The changed feed ratio is above the stoichiometric value of the air ratio of 1. Preferably, the air ratio is reduced by 0.1 or by 0.06 to values greater than or equal to 1.05. From the detected ionization signal and from stored data, a setpoint value is recalculated in a third step.
  • However, the correction of the control curve presupposes that the heat generated during the duration of the test can also be dissipated to consumers such as heating or service water. Otherwise, the amount of heat generated during the test is higher than the amount of heat removed. As a result, the temperature in the system rises and the temperature controller of the system switches off the burner. The test on a certain air flow can not be completed in this case.
  • This problem is aggravated by the fact that it takes some time during a test run to get stable values. To make matters worse, that the duration of a test run in general can not be arbitrarily shortened.
  • The European patent EP2466204B1 is registered on December 16, 2010 and issued on November 13, 2013. EP2466204B1 discloses and claims a control device for a burner system.
  • The European patent application EP1293727A1 is registered on September 13, 2001. EP1293727A1 teaches a control device for a burner according to the preamble of claim 1.
  • The patent US5049063A was notified on 26 December 1989 and granted on 17 September 1991. US5049063A discloses an apparatus for controlling the combustion of a burner.
  • The present disclosure is an improved correction of the control curve of an ionization electrode, which at least partially overcomes the aforementioned disadvantages.
  • Summary
  • The present disclosure is based on the finding that burner conditions and thus any corrections to a control curve change slowly during operation. In particular, the conditions and, consequently, the due corrections along the control curves generally do not change abruptly. This allows an estimate of how a correction at a test point affects adjacent values.
  • The above finding allows the correction of a control curve during operation of a burner system and at any air flow rates. The cited finding also makes it possible to correct a control curve in a calibration mode or maintenance mode of a burner system. For this purpose, in a first step, several test points, ie ionization currents relative to blower speeds or air flow rates of the burner system, recorded. This ensures that at least one test point is close to the currently required air volume flow. If a test run is not possible at an existing test point, the correction determined for an adjacent test point is first calculated into the correction of the present test point. Thus, the thus-corrected present test point is equalized to adjacent test points.
  • The stated object is achieved according to the invention by a control device and / or by a method according to the independent claims of this disclosure. Preferred embodiments are given in the dependent claims.
  • Brief description of the figures
  • Hereinafter, ways for carrying out the invention will be described with reference to figures. Show it:
    • Fig. 1 schematically a burner system with a control device according to the invention, which is controlled by an ionization signal.
    • Fig. 2 a control curve recorded under laboratory conditions and a deviating control curve of an aged ionization electrode with incomplete correction.
    Detailed description and ways of carrying out the invention
  • The Fig. 1 schematically shows a burner system, preferably a gas burner, with a control device according to the invention and / or with the inventive method. The control operates in normal operation as a fuel-air-composite control. A burner generates a flame (1). An ionization electrode (2) detects an ionization current. At the ionization electrode (2) is typically an AC voltage in the range 110 V ... 240 V at. The ionization current detected by the ionization electrode (2) means that a DC voltage applied to the ionization electrode (2) is superposed by a DC voltage. This results in a direct current. This DC increases with increasing ionization of the gas in the flame area. On the other hand, the direct current decreases with increasing excess air of combustion. For further processing of the signal of the ionization electrode, it is common to use a low-pass filter, so that the ionization current is produced from the filtered ionization signal (4). The occurring DC voltage results in a direct current, which is typically in the range of less than 150 microamps and often well below this value.
  • A device for separating direct current and alternating current of an ionization electrode is, for example, in EP1154203B1 . Fig. 1 , shown and explained inter alia in section 12 of the description. On the relevant parts of the disclosure of EP1154203B1 is referred to here.
  • Ionization electrodes (2) as used herein are commercially available. The material of the ionization electrodes (2) is often KANTHAL®, e.g. APM® or A-1®. Nikrothal® electrodes are also contemplated by those skilled in the art.
  • The ionization current is amplified by a flame amplifier (3). The flame amplifier (3) also closes the electrical circuit by connecting the flame amplifier (3) to the ground electrode of the burner. The ionization signal (4) processed by the flame amplifier (3) is relayed to an adjusting device (5). The adjusting device (5) uses in normal operation, the ionization signal (4) as an input signal for a control. The ionization signal (4) is preferably an analog electrical signal. It (4) may alternatively be designed as a digital signal or as a digital variable of two software module units.
  • In operation, the adjusting device (5) reacts to an external request signal (11), which specifies a heat output. In addition, the control can be switched on and off on the basis of the request signal (11). A quantity of heat and associated air flow can, for example, from a parent, in Fig. 1 not shown, temperature control circuit can be requested. Furthermore, such a specification can be specified by an external consumer and / or directly by hand, for example by means of a potentiometer.
  • It is customary to map the request signal (11) to one of the two actuators (6, 7) with the aid of data stored in the setting device (5). In a preferred embodiment, the request signal (11) is mapped to speed setpoints for a fan as the first actuator (6). Subsequently, the speed setpoints are compared with a speed signal (9) returned by a blower (6). A speed controller integrated in the control device (5) controls the blower (6) via a first control signal (8) to a desired flow rate of air (12) corresponding to the request signal (11). In a specific embodiment, the Stelleinreichtung (5) comprises a speed control, in particular a speed control for proportional, integral and / or derivative components, and gives a control signal to the blower (6) on. According to a further embodiment, the request signal (11) can be imaged directly on the first control signal (8) of the blower (6). Furthermore, the mapping of the request signal (11) to a fuel valve as a first, power-carrying actuator is possible.
  • A second actuator (7), preferably a fuel valve, leads via the supply of fuel (13) to the air ratio. For this purpose, the adjusting device (5) forms the predetermined request signal (11), ie the rotational speed feedback signal (9), to a nominal value of the ionization signal (4). On the basis of the difference between the ionization signal (4) and setpoint of the ionization signal (4) is contained in the actuator via a Control unit, the fuel valve (7) regulated. In this way, a change in the ionization signal (4) via a second control signal (10) causes a change in the position of the fuel valve (7). This changes the flow of fuel (13). The control loop is closed by causing a change in the amount of fuel for a given amount of air, a change of the ionization current through the flame (1) and through the ionization electrode (2). Associated with this is a change in the ionization signal (4) until its actual value again equals the predetermined desired value.
  • Fig. 2 shows as a solid curve a control curve (14). In Fig. 2 the ionization current in microamps (15) is plotted against the air volume flow (16). According to a preferred embodiment, the air volume flow (16) corresponds to the speed of the fan (6). Such a control curve serves the setting device (5) for setting the air ratio for various request signals (11) taking into account the ionization signal (4).
  • In other words, the control device is designed to set an air volume flow (16) of the burner system, taking into account the ionization flow (15).
  • Common burner systems in the sense of this disclosure have powers of a few 10 kW up to 100 kW and above and the associated air volume flows. Common speeds of the blower are in the range of a few 1000 to 10,000 revolutions per minute.
  • Fig. 2 shows the Ionisationstrom (15) for different air flow rates (16). The different values of the ionization current (15) for different air volume flows (16) are first recorded in the laboratory (under test conditions). This results in the control curve (14). In Fig. 2 are recorded value pairs of ionization and air flow connected by straight, solid lines to a control curve. The value pairs are bases of the standard curve and are marked with crosses X in Fig. 2 located.
  • The recording of the bases of a control curve preferably takes place in the laboratory with a new and / or less aged ionization electrode (2).
  • The totality of these bases forms a control curve as in Fig. 2 shown. For this purpose, the control device is designed to join the bases to a control curve. According to a preferred embodiment, the joining to a control curve also includes the subsequently disclosed interpolation.
  • The control device accordingly comprises a memory and is designed to store pairs of air volume flow (16) of the burner system and ionization flow (15). The memory may be, for example, random access memory (RAM), flash memory, EPROM memory, EEPROM memory, memory registers, one or more hard drives, one or more floppy disks, other optical drives, or any computer-readable medium. This list is not exhaustive. In a preferred embodiment, the memory of the controller is non-volatile.
  • According to Fig. 2 is linearly interpolated between the recorded values. In a further embodiment, quadratic interpolation takes place between the recorded values, ie a quadratic term and / or a higher-order term is taken into account in addition to a linear term. According to a further embodiment interpolated between the recorded values on the basis of (cubic) splines.
  • In general, the interpolation provides additional values of the ionization current (15) in addition to the recorded values of the ionization current (15). The other values of the ionization current are between the recorded values. They are still between the corresponding set air flow rates (16) of the burner system. The interpolation results in the ionization flow to the air volume flow between the recorded values.
  • Like the control points of the control curve, the test points are also determined in the laboratory with a new and / or less aged ionization electrode. This is done using the test procedure as in EP2466204B1 revealed performed. Of these test points, the I C0 values are in Fig. 2 shown as circles on the control curve (14). The I B0 values are shown as circles above the control curve (14). I C0 value and I B0 value of a test point are at the same (or substantially the same) blower speed or at the same (or substantially the same) air flow rate. The I C0 values result from the control curve due to the selected air flow rates for the test points. They can be either identical to a vertex or calculated by interpolation. The I B0 values result from the selected λ change in the air ratio λ at the respective test point.
  • In the laboratory it is further ensured that a requested amount of heat or air volume flow (16) is also removed. This eliminates the possibility that the temperature in the system (too fast and / or too high) will increase in the laboratory because the burner will burn during the duration of test runs (to set blower speeds, fan speed and I B0 per test point). generates more heat than can be dissipated. It is thus possible under laboratory conditions to determine all (above-mentioned) values for the test points.
  • According to a specific embodiment, 8, 16, 32 or 64 interpolation points for the control curve are recorded in the laboratory. According to a further embodiment, 5, 10, 15, 20 or 25 test points are recorded along the control curve (14) under laboratory conditions. In the event that the control curve points (interpolation points) do not coincide with the test points, one interpolates between the recorded interpolation points of the control curve according to one of the above methods in order to obtain the I C0 values at the test points.
  • The ionization electrode (2) is subject to aging during operation. As a result of aging, the characteristics of the ionization electrode (2) change. In other words, the control curve of an aged ionization electrode (2) deviates from that (14) of a new ionization electrode (2).
  • Fig. 2 shows as a dashed curve a deviating control curve (17). The deviating control curve (17) takes into account the aging of the ionization electrode (2). The points in the form of crosses of this control curve (17) are the ionization current values corrected at the test points based on the tests.
  • Fig. 2 shows next to the cross-shaped test points a special test point (18). The test point (18) is a test point at which at least one test run had to be aborted (or could not be started at all). Therefore, the ionization current of this test point (18) is taken to an older date than the ionization currents of the other test points of the dashed control curve (17).
  • In practice, it is quite possible that at the test point (18) several test procedures have failed. This may occur, for example, if at the time of one or more tests, the requested amount of heat or the requested air volume flow (16) is not removed. The temperature in the system rises in such a case as described in the introduction and the test run is aborted.
  • The dashed control curve (17) deviates upwards in the region of the test point (18). Thus, the dashed control curve (17) and the laboratory recorded rule curve (14) in the region of the test point (18) are less spaced than usual. It can be assumed that the distorted by that test point (18) control curve (17) the aged ionization electrode (2) not optimally characterized.
  • First, the obviously faulty test point (18) can now be corrected based on the assumption that adjacent test points change similarly. At a test point of the control curve, let I B0 be the absorbed ionization current during a test run under laboratory conditions and I B1 the absorbed ionization current during a first test run after several hours of operation. According to EP2466204B1 The ionization currents I B0 and I B1 correspond to a mixture enriched in comparison to the control curve, that is to say there is more fuel (13), in particular more gas, and less air (12). The same can be achieved, for example, by supplying more fuel (13) at a constant fan speed.
  • Now the test run k at the faulty test point (18) failed, so that no ionization current I Bk is present. In addition, the ionization current I neighbor Bk of the k- th test run and the corresponding laboratory value I NaChbarB0 are known at the posthear point of the test point (18). According to the invention, the ionization current I Bk is now calculated or estimated from the ionization currents I Neighbor Bk and I Neighbor B0 of the adjacent test point and referred to below as I Bk : 1 I Bk = 1 I NachbarBk - 1 I NachbarB 0 + 1 I B 0
    Figure imgb0001
  • The above estimate is based on the assumption that adjacent test points shift (roughly) equally. This assumption is not always a good approximation. In particular, it is not when the test value changes greatly from one test run to the next.
  • The test at a test point estimated by a neighbor (as above test point (18), for example) is basically made up for as soon as the burner output or air flow rate matches.
  • In other words, the inventive control device is designed to form a difference between the Inverse of a first ionization current I neighbor Bk to a first air volume flow and a reciprocal of a second ionization I neighbor B0 , which was recorded in time before the first ionization current I neighbor Bk and belongs to the first air flow or substantially to the first air flow.
  • I neighbor B0 was recorded in time before the first ionization current I neighbor Bk by I neighbor B0 was recorded, for example during a test run under laboratory conditions. Test runs under laboratory conditions typically take place as type tests / adjustments (= setpoint / parameter determination) and / or routine tests and / or as factory tests during the development or during the manufacture of a device.
  • The control device according to the invention is furthermore designed to calculate the reciprocal and the value of a displaced ionization current I Bk as the sum of this difference and the reciprocal of a further ionization current I B0 , the further ionization current and the displaced ionization current belonging to a second air volume flow of the burner system is different from the first air volume flow of the burner system.
  • In order not to correct solely on the basis of this estimation and since I Bk ↑ will not be identical to a real measured I Bk under all environmental conditions, I Bk ↑ is filtered with the filter constant e to the ionization current I B (k - 1) of a previous test run. This gives a value for the filtered ionization current I Bk ' I Bk ' = I B k - 1 e + I Bk 1 - e
    Figure imgb0002
  • The index k refers to the current test run. The ionization currents and air volume flows with the indices 1 to k - 1 refer to previously performed test runs or the test values calculated by filtering, ie to historical tests at this test point. Depending on the embodiment individual of these historical test values or all historical test values are stored in the control device.
  • The value of the filter constant e can assume values between 0 and 1, preferably between 0.2 and 0.8, furthermore preferably between 0.35 and 0.65 or 0.5 to 0.9. The adjustment is made to a test point with the same or substantially the same air volume flow (16) of the burner system.
  • The person skilled in the art readily recognizes that the above-mentioned filtering is also based on reciprocal values and on the basis of a filter constant e ' , ie according to 1 I Bk ' = 1 I B k - 1 e ' + 1 I Bk 1 - e '
    Figure imgb0003
    can be carried out in a similar way. The filter constants e and e ' may be different from each other.
  • In other words, the control device is designed to filter the reciprocal or the value of the shifted ionization current I Bk using a filter constant e , e ' to the reciprocal or value of a historical ionization current I B (k - 1) , which is prior to first ionization current I NachbarBk was recorded and belongs to the second air volume flow or substantially to the second air volume flow, so that as a result of filtering a filtered ionization current I Bk ' and its inverse are calculated.
  • I B (k-1) was recorded in time before the first ionization current I neighbor Bk by recording I B (k-1) in operation with the index k -1 during the test run, for example. The test run during operation with the index k -1 precedes the test run during operation with the index k . Typical time intervals between successive test runs range from a few tens to a few hundred hours. But it can also be only a few hours or a few thousand hours between successive test runs.
  • Behind each of these filters is first a Markov assumption, according to which a filtered ionization current I Bk 'of a test point depends on the ionization current I B (k - 1) of its immediately preceding test point. According to a further embodiment, the filtered ionization current I Bk 'of a test point depends on ionization currents I B (k-1) and I B (k-2) of two preceding test points: I Bk ' = I B k - 1 e + I B k - 2 f + I Bk 1 - e - f
    Figure imgb0004
  • The same applies to the filtering based on reciprocal ionization currents. The value of the filter constant f varies as well as the value of the filter constant e between 0 and 1, preferably between 0.2 and 0.8, more preferably between 0.35 and 0.65 or between 0.5 and 0.9. The filter constants e and f may be the same or different depending on the embodiment. The person skilled in the art readily recognizes that the filtering of ionization currents on the basis of previous test points can also refer to more than two ionization currents of preceding test points.
  • From the calculated test value I Bk ' is finally calculated according to the in EP2466204B1 disclosed method of the ionization of the control curve corrected, for example in Fig. 2 the point (18). The in EP2466204B1 The disclosed method is based on the finding that ionization currents can be corrected as electrical (fault) resistors. The corrected ionization current I Ck 'of the control curve is therefore calculated from the reciprocal ionization currents 1 / I Bk' , 1 / I B0 (exactly) of this test point and from the reciprocal ionization current I / I C0 (the original control curve and determined at this point under laboratory conditions ) according to 1 I ck ' = 1 I Bk ' - 1 I B 0 + 1 I C 0
    Figure imgb0005
  • In other words, the control device is designed to calculate a second difference from a reciprocal of the filtered ionization current I Bk ' and from the reciprocal of the ionization current I B0 .
  • The control device is also designed to add this second difference to the reciprocal of a third ionization current I C0 and to obtain a shifted third ionization current I Ck ' , wherein the third ionization current I C0 was recorded before the first ionization current I N - achbarBk and second air volume flow of the burner system heard.
  • I C0 was taken in time before the first ionization current I neighbor Bk by I C0 was recorded, for example, during a test run under laboratory conditions. Test runs under laboratory conditions typically take place as type tests and / or routine tests and / or as factory tests during the development or during the manufacture of a device.
  • According to a specific embodiment, each individual recorded value of the ionization current I B0 , optionally I B1 and, if applicable, I C0 is a (weighted) mean value of a plurality of measured values of the ionization current. According to a particular embodiment, the weighting is an arithmetic or geometric mean. According to a further embodiment, in the weighting n inverse ionization currents 1 / I B01 , 1 / I B02 , 1 / I B03 ,..., 1 / I B0n according to FIG n I B 0 = 1 I B 01 + 1 I B 02 + 1 I B 03 + ... + 1 I B 0 n
    Figure imgb0006
    averaged to an average ionization current I B0 .
  • The thus determined ionization current I Ck ' is now based on the corrected control curve. In the present case, for example, the ionization current becomes obvious faulty test point (18) replaced by the ionization current I Ck ' .
  • In other words, the control device is additionally designed to store the shifted third ionization current as part of a corrected control curve (17) and / or to calculate and / or store the correction (deviation) from this ionization current to the original control curve.
  • The burner system continues to run on the basis of the corrected control curve until the burner system controls the power range or the air volume flow to test point (18) once again, ie modulates into the area around test point (18) . In this case, an ionization current at the same test point can be determined, so that an actual measured value is present. The burner system then again uses a control curve based on measured values and not (only) on filtered estimates. The modulation of the burner system in the area around the test point (18) can be done both targeted at the start of the burner system as well as during operation.
  • The present correction on the basis of a filtering of the ionization currents to previous measured values is not used during the first hours of operation. Due to the peculiarity of a comparatively rapid aging of the ionization electrode (2) during the first hours of operation or days, an adjustment during this time is suppressed. Preferably, an adjustment during an operating time of about three days is suppressed. Further preferably, alignment is inhibited during an initial operation time of one hour or two hours or five hours or ten hours or 20 hours or one day or two days or five days or ten days or twenty days. By suppressing the adjustment, deviating and generally somewhat leaner combustion values are obtained for the new condition, which however can be well tolerated.
  • According to another embodiment, the correction based on an adjustment during the first hours of operation is not suppressed. Instead, the comparatively rapid aging of the ionization electrode (2) is taken into account by first carrying out test runs at shorter time intervals. By using test runs within shorter time intervals, the test points shift less between the test runs. Therefore, in the case of test runs within shorter time intervals, the mentioned method of equalization to ionization currents to previous measured values can continue to be used.
  • According to a further embodiment, the comparatively rapid change of the ionization electrode (2) is determined by shortened time intervals between test runs. The system recognizes the change in the ionization current between successive test runs and automatically shortens or lengthens the time intervals between test runs. The shortening or lengthening of the time intervals between successive test runs occurs as a function of the change in the ionization current (that is, as a function of the gradient).
  • In other words, the control device is formed on the basis of the at least one ionization electrode (2) to record repeated ionization currents (15),
    and the control device is designed to repeatedly form a difference between the reciprocal of a first ionization current to a first air volume flow (16) and a reciprocal of a second ionization current, which was recorded before the first ionization current and to the first air volume flow (16) or substantially to first air volume flow (16), wherein the time intervals between differences depending on the differences of the respective recorded ionization currents.
  • According to a preferred embodiment, it is not only possible with the aforementioned steps and / or formulas to shift and / or align ionization currents which are interrupted Test run belong. Instead, any values of ionization currents can be estimated and / or filtered on a control curve. This includes in particular those values of ionization currents which have arisen through interpolation between measured values.
  • According to a further embodiment, the correction of the control curve is carried out by selecting the most suitable test point in operation based on the current burner output. As a rule, the most suitable test point is that test point which is closest to the current burner output or the current fan speed or the current air volume flow. At this test point, an ionization current is then recorded. The ionization currents at the remaining test points are taken to the best matching test point after the ionization current. The ionization currents, for example, can only be recorded when the burner output or the fan speed or the air volume flow is modulated in the vicinity of the respective test point.
  • In other words, the control device is preferably designed to select a most suitable test point of the control curve (14 or 17) in operation starting from the current air volume flow 16 of the burner system and to record a pair of ionization flow 15 and air flow 16 at this test point. The inclusion of pairs of ionization 15 and air flow 16 at other test points of the control curve (14 or 17) is postponed in time.
  • Portions of a controller or method according to the present disclosure may be implemented as hardware, as a software module executed by a computing unit, or a cloud computer, or as a combination of the foregoing. The software may include firmware, a hardware driver running within an operating system, or an application program. The present disclosure thus also relates to a computer program product which has the features this disclosure contains or performs the necessary steps. When implemented as software, the functions described may be stored as one or more instructions on a computer-readable medium. Some examples of computer-readable media include random access memory (RAM), magnetic random access memory (MRAM), read only memory (ROM), flash memory, electronically programmable ROM (EPROM), electronically programmable and erasable ROM (EEPROM), arithmetic unit, register Hard disk, a removable storage device, optical storage, or any suitable medium that can be accessed by a computer or other IT devices and applications.
  • The above refers to individual embodiments of the disclosure. Various changes may be made to the embodiments without departing from the basic idea and without departing from the scope of this disclosure. The subject matter of the present disclosure is defined by its claims. Various changes can be made without departing from the scope of the following claims.
  • Bezugsszeichen
    • 1 flame
    • 2 ionization electrode
    • 3 flame amplifier
    • 4 ionization signal
    • 5 adjusting device
    • 6 first actor
    • 7 second actor
    • 8 first control signal
    • 9 speed signal
    • 10 second control signal
    • 11 request signal
    • 12 air
    • 13 fuel
    • 14 control curve recorded in the laboratory under test conditions
    • 15 y-axis with ionization current
    • 16 x axis with blower speed or air volume flow or burner output / burner system power
    • 17 control curve taking into account the aging of the ionization electrode
    • 18 test point with aborted test run

Claims (13)

  1. Device for regulating a burner system with at least one burner, and with at least one ionisation electrode (2), which is disposed so that, when the burner system is operating, it lies in the area of a flame (1) of the at least one burner,
    wherein the regulation device is embodied, on the basis of the at least one ionisation electrode (2), to record an ionisation current (15),
    wherein the regulation device is embodied to set an air volume flow rate (16) of the burner system, taking into account the ionisation current (15),
    wherein the regulation device comprises a memory and is embodied to store pairs consisting of air volume flow rate (16) of the burner system and ionisation current (15),
    wherein the regulation device is embodied to form a difference between the reciprocal value of a first ionisation current (IneighborBk ) and a first air volume flow rate (16) and a reciprocal value of a second ionisation current (IneighborB0 ), which was recorded at a point in time before the first ionisation current (IneighborBk ) and belongs to the first air volume flow rate (16) or essentially belongs to the first air volume flow rate (16),
    wherein the regulation device is embodied, as the sum of this difference and of the reciprocal value of a further ionisation current (IB0 ), to calculate the reciprocal value and the value of a displaced ionisation current (I Bk), characterised in that the regulation device is embodied to filter the reciprocal value or the value of the displaced ionisation current (I Bk), using a filter constant on the reciprocal value or value of a historical ionisation current which was recorded at a point in time before the first ionisation current (IneighborBk ) and belongs to the second air volume flow rate or essentially belongs to the second air volume flow rate, so that, as a result of the filtering, a filtered ionisation current and its reciprocal value are calculated, wherein the further ionisation current (IB0 ) and the displaced ionisation current (I Bk) belong to a second air volume flow rate of the burner system, which is different from the first air volume flow rate (16) of the burner system
    and
    the second ionisation current (IneighborB0 ) was recorded under laboratory conditions at a new or minimally aged ionisation electrode.
  2. Device for regulating a burner system according to claim 1, wherein the regulation device is additionally embodied to calculate a second difference from a reciprocal value of the filtered ionisation current and from a reciprocal value of the further ionisation current (IB0 ).
  3. Device for regulating a burner system according to claim 2, wherein the regulation device is additionally embodied to add the second difference to the reciprocal value of a third ionisation current and to obtain from said addition a displaced third ionisation current, wherein the third ionisation current was recorded at a point in time before first ionisation current (IneighborBk ) and belongs to the second air volume flow rate of the burner system.
  4. Device for regulating a burner system according to claim 3, wherein the regulation device is additionally embodied, to join together pairs consisting of air volume flow rate (16) of the burner system and ionisation current (15) into a regulating curve (14 or 17) and to store them.
  5. Device for regulating a burner system according to claim 4, wherein the regulation device is additionally embodied, to compute and/or to store the displaced third ionisation current as part of a corrected regulating curve (17) and/or to compute and/or to store from this ionisation current, the correction, especially the deviation, from the original regulating curve.
  6. Device for regulating a burner system according to claim 1, wherein the further ionisation current (IB0 ) was recorded under laboratory conditions at a new or minimally aged ionisation electrode.
  7. Device for regulating a burner system according to claim 1, wherein the historical ionisation current was recorded at a point in time after the second ionisation current.
  8. Device for regulating a burner system according to one of the preceding claims, wherein the value or the reciprocal value of the displaced ionisation current (I Bk) are filtered on the value or reciprocal value of a historical ionisation current, in that the value or reciprocal value of the displaced ionisation current (I Bk) are reduced by a percentage and the value or the reciprocal value of the historical ionisation current are increased by the same percentage.
  9. Device for regulating a burner system according to one of the preceding claims, wherein the regulation device is embodied, on the basis of the at least one ionisation electrode (2), to record an ionisation current (15) and the recording of the ionisation current (15) comprises a number of individual measurements of ionisation currents (15).
  10. Device for regulating a burner system according to claim 4 or 5, wherein the regulation device is embodied, during operation, starting from the current air volume flow rate (16) of the burner system, to select a best fitting test point of the regulating curve (14 or 17) and to record at this test point a pair consisting of ionisation current (15) and air volume flow rate (16) and to defer the recording of pairs consisting of ionisation current (15) and air volume flow rate (16) to other test points or the regulating curve (14 or 17).
  11. Device for regulating a burner system according to one of the preceding claims, wherein the regulation device is embodied to form a difference between the reciprocal value of a first ionisation current (IneighborBk ) for a first air volume flow rate (16) and a reciprocal value of a second ionisation current (IneighborB0 ), which was recorded at a point in time before the first ionisation current, and belongs to the first air volume flow rate (16) or essentially belongs to the first air volume flow rate (16), and wherein the formation of the difference only occurs for the first time after an hour or after two hours or after five hours or after ten hours or after 20 hours or after one day or after two days or after 5 days or after 10 or after 20 days.
  12. Device for regulating a burner system according to one of the preceding claims, wherein the regulation device is embodied, on the basis of the at least one ionisation electrode (2), to repeatedly record ionisation currents (15), and the regulation device is embodied to repeatedly form a difference between the reciprocal value of a first ionisation current (IneighborBk ) for a first air volume flow rate (16) and a reciprocal value of a second ionisation current (IneighborB0 ) which was recorded at a point in time before the first ionisation current (IneighborBk ), and belongs to the first air volume flow rate (16) or essentially belongs to the first air volume flow rate (16), and wherein the time intervals between the formation of the differences depend on the differences between the ionisation currents recorded in each case.
  13. Method for regulating a burner system with at least one Brenner, with at least one memory, with at least one ionisation electrode (2), which is disposed such that, during operation of the burner system, it lies in the area of a flame (1) of the at least one burner, the method comprising the steps
    Recording of an ionisation current (15) on the basis of the at least one ionisation electrode (2),
    Setting an air volume flow rate (16) of the burner system, taking into account the ionisation current (15),
    Storage of pairs consisting of air volume flow rate (16) of the burner system and ionisation current (15),
    Forming a difference between the reciprocal value of a first ionisation current (IneighborBk ) for a first air volume flow rate (16) and a reciprocal value of a second ionisation current (IneighborB0 ), which was recorded at a point in time before the first ionisation current (IneighborBk ), and belongs to the first air volume flow rate (16) or essentially belongs to the first air volume flow rate (16), characterised in that the method additionally comprises
    Calculating the reciprocal value and the value of a displaced ionisation current (I Bk) as the sum of this difference and the reciprocal value of a further ionisation current (IB0 ), wherein the further ionisation current (IB0 ) and the displaced ionisation current (I Bk) belong to a second air volume flow rate of the burner system which is different from the first air volume flow rate (16) of the burner system,
    Filtering of the reciprocal value or of the value of the displaced ionisation current (I Bk), using a filter constant on the reciprocal value or value of a historical ionisation current which was recorded at a point in time before the first ionisation current (IneighborBk ) and belongs to the second air volume flow rate or essentially belongs to the second air volume flow rate, so that, as a result of the filtering, a filtered ionisation current and its reciprocal value are calculated,
    wherein the method additionally comprises the step of calculating a second difference from a reciprocal value of the filtered ionisation current and from a reciprocal value of the further ionisation current (IB0 ).
EP15151600.2A 2015-01-19 2015-01-19 Device for the control of a burner assembly Active EP3045816B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15151600.2A EP3045816B1 (en) 2015-01-19 2015-01-19 Device for the control of a burner assembly

Applications Claiming Priority (4)

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PL15151600T PL3045816T3 (en) 2015-01-19 2015-01-19 Device for the control of a burner assembly
EP15151600.2A EP3045816B1 (en) 2015-01-19 2015-01-19 Device for the control of a burner assembly
US14/982,171 US10054309B2 (en) 2015-01-19 2015-12-29 Device for regulating a burner system
CA2917749A CA2917749C (en) 2015-01-19 2016-01-15 Device for regulating a burner system

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EP3045816A1 EP3045816A1 (en) 2016-07-20
EP3045816B1 true EP3045816B1 (en) 2018-12-12

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DE102015225886A1 (en) * 2015-12-18 2017-06-22 Robert Bosch Gmbh Heater system and method with a heater system
EP3382277A1 (en) 2017-03-27 2018-10-03 Siemens Aktiengesellschaft Detection of a cover

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EP1293727A1 (en) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Control apparatus for a burner and a method for adjustment

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EP2177830A1 (en) * 2008-10-16 2010-04-21 Siemens Building Technologies HVAC Products GmbH Gas burner for a combined gas-air control system
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EP1293727A1 (en) * 2001-09-13 2003-03-19 Siemens Building Technologies AG Control apparatus for a burner and a method for adjustment

Also Published As

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EP3045816A1 (en) 2016-07-20
US10054309B2 (en) 2018-08-21
US20160209026A1 (en) 2016-07-21
CA2917749A1 (en) 2016-07-19
PL3045816T3 (en) 2019-07-31
CA2917749C (en) 2018-03-13

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