Self-adaptive control method and system for wall-mounted gas boiler

Abstract

The invention discloses a self-adaptive control method and system for a wall-mounted gas boiler, and relates to the field of wall-mounted gas boilers, and the method comprises the following steps: operating the wall-mounted gas boiler, obtaining a gas calorific value component before gas and combustion-supporting gas are mixed through a gas calorific value instrument, or obtaining a calorific value component of mixed gas formed after the gas and the combustion-supporting gas are mixed, and obtaining a real-time calorific value component; the efficient air-fuel ratio is calculated at least according to the real-time heat value components, and the gas flow / gas volume and / or the combustion-supporting gas flow / combustion-supporting gas volume are adjusted / determined in real time; the method further comprises a fuel gas heat value instrument zero marking method which comprises the steps that a fuel gas valve is closed, combustion-supporting gas / air is adopted to replace fuel gas in the fuel gas heat value instrument, and the combustion-supporting gas / air zero marking fuel gas heat value instrument can pass through the combustion-supporting gas / air zero marking fuel gas heat value instrument; thus, efficient, energy-saving and low-pollution gas combustion is achieved, it is ensured that the wall-hanging stove is in the optimal combustion condition in real time, and the measurement accuracy of the gas calorific value instrument is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of gas wall-mounted boilers, and in particular to an adaptive control method and system for a gas wall-mounted boiler. Background Art

[0002] In the past, the gas-fired wall-mounted boilers on the market basically had their gas-to-air ratios determined after development and testing under a standard experimental environment. The air-fuel ratios under different heat loads were fixed values, which could achieve efficient combustion. Due to differences in the production process, installation scenarios, and different pipeline gases, the actual air-fuel ratio will change significantly, deviating from the optimal air-fuel ratio combustion, which ultimately affects the thermal efficiency and pollution emission performance of the wall-mounted boiler. Therefore, it is generally necessary to debug and correct the gas-to-air ratio again during the comprehensive inspection process of the production line and during user installation, which places high technical requirements on production and installation personnel. Moreover, even after two air-fuel ratio combustion debuggings, it can only guarantee the combustion performance of the wall-mounted boiler when the user installs it. When the wind and rain outside the exhaust pipe and the pipeline gas pressure or even the composition change, the ratio of gas to air will still change, and the expected energy-saving and emission reduction effects cannot be fully achieved.

[0003] At present, with the advancement of science and technology, there are more and more fully premixed wall-mounted boilers with adaptive combustion adjustment functions. For this type of fully premixed wall-mounted boilers, most of them on the market judge and automatically adjust the ratio of gas to air based on the ion current of the combustion flame. For example, the adaptive control method and system of wall-mounted boilers disclosed in patent documents "CN117722772A" and "CN112524810A" use ion sensing needles to detect the size and change trend of the flame ion current and adjust the ratio of gas to air in the wall-mounted boiler burner.

[0004] However, first of all, the relationship between ion current and air-fuel ratio is only a changing trend. It is a relationship fitted by R&D personnel after testing a large amount of data. The relationship obtained after fitting will have some deviations from the specific corresponding relationship in actual use, and is not representative. Secondly, the ion sensing needle will work at high temperature for a long time, and there will be a certain degree of oxidation, and some combustion products will also adhere to the burner surface of the wall-mounted boiler, which will affect the accuracy of the ion sensing needle in detecting the flame ion current. Moreover, the determination of the ion current will produce errors due to factors such as the measurement environment and the measurement method, resulting in inaccurate air-fuel ratio data in the wall-mounted boiler, making it impossible to keep the wall-mounted boiler in a state of high combustion efficiency.

[0005] In addition, some fully premixed wall-mounted boilers use oxygen sensors or carbon dioxide sensors in the flue gas to determine the air-fuel ratio state, but the effective service life of these sensors is relatively short and they have not yet been stably applied to wall-mounted boiler products. Summary of the invention

[0006] The main purpose of the present invention is to provide a gas wall-mounted boiler adaptive control method and system, aiming to solve the above problems.

[0007] To achieve the above object, the present invention proposes a gas wall-mounted boiler adaptive control method, comprising the following steps:

[0008] Step S1, running the gas wall-mounted boiler, obtaining the calorific value composition of the gas before the gas and the supporting gas are mixed, or the calorific value composition of the mixed gas formed after the gas and the supporting gas are mixed, through a gas calorific value meter, to obtain the real-time calorific value composition;

[0009] Step S2, calculating the efficient air-fuel ratio at least according to the real-time calorific value component, and adjusting / determining the gas flow / gas volume, and / or the supporting gas flow / supporting gas volume in real time according to the efficient air-fuel ratio;

[0010] The gas wall-mounted boiler adaptive control method further includes a gas calorific value meter zeroing method, and the gas calorific value meter zeroing method includes the following steps:

[0011] Step S2', close the gas valve, and use auxiliary gas / air to replace the gas in the gas calorific value meter, so as to zero the gas calorific value meter through the auxiliary gas / air, wherein the gas wall-mounted boiler also includes a mixer, the gas valve and a combustion chamber, the mixer has a first input end, a second input end and an output end, the first input end is connected to the auxiliary gas pipeline, the second input end is connected to the gas pipeline, the output end is connected to the mixing pipeline, the mixing pipeline is connected to the combustion chamber, the gas pipeline includes a first section of the pipeline connected to the upstream end of the gas valve, and a second section of the pipeline connected to the downstream end of the gas valve, and the gas calorific value meter is arranged in the second section of the pipeline or the mixing pipeline.

[0012] The present invention also provides a gas wall-mounted boiler adaptive control system, comprising:

[0013] Combustion chamber;

[0014] A mixer having a first input end, a second input end and an output end, wherein the first input end is connected to a combustion-aiding gas pipeline, the second input end is connected to a gas pipeline, the output end is connected to a mixing pipeline, the mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section of pipeline and a second section of pipeline;

[0015] A gas valve is provided on the gas pipeline, and its upstream end is connected to the first section of the pipeline, and its downstream end is connected to the second section of the pipeline, and the gas valve is used to adjust the gas flow rate / gas volume;

[0016] A gas calorific value meter, provided in the second section of the pipeline or the mixing pipeline, for detecting the calorific value components of the gas in real time; and

[0017] The controller is electrically connected to the gas valve and the gas calorific value meter, and is used to obtain and process signal data to execute the gas wall-mounted boiler adaptive control method.

[0018] In the technical solution of the present invention, the real-time calorific value component directly affects the amount of gas flow / gas volume involved in complete combustion. The real-time calorific value component is obtained through a gas calorific value meter, and the efficient air-fuel ratio is calculated based on the real-time calorific value component, that is, the air-fuel ratio when the gas can be fully burned, and then the gas flow / gas volume and / or the auxiliary gas flow / auxiliary gas volume are adjusted / determined in real time. In this way, it can well adapt to the influence of gas component differences on thermal efficiency, achieve high efficiency, energy saving and low pollution in gas combustion, ensure that the wall-mounted boiler is in the best combustion state in real time, and can adapt to the influence of gas components brought about by the future trend of hydrogen blending of natural gas; compared with the conventional method of judging and adjusting the air-fuel ratio based on the ion current of the combustion flame, oxygen sensor or carbon dioxide sensor, the accuracy of the data obtained is higher, and the accuracy of the data after long-term operation can be better guaranteed. At the same time, the air-fuel ratio of the wall-mounted boiler can be quickly and accurately adaptively adjusted, and no professional personnel are required to debug the combustion air-fuel ratio during production and installation. In addition, the adaptive control method for a gas wall-mounted boiler provided by the present invention also includes a gas calorific value meter zeroing method, which realizes zeroing the gas calorific value meter by replacing the gas in the gas calorific value meter with auxiliary gas, so as to calibrate the standard operating condition and abnormal operating condition of the gas calorific value meter, and determine the data of the gas calorific value meter in normal operation and abnormal operation, so as to facilitate adaptive adjustment of the gas calorific value meter when it is in an abnormal operating condition, thereby ensuring the measurement accuracy of the gas calorific value meter, and further ensuring the accuracy of air-fuel ratio judgment and adjustment of the gas wall-mounted boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a flow chart of the adaptive control method for a gas wall-mounted boiler provided by the present invention.

[0021] Figure 2 A schematic structural diagram of an embodiment of the adaptive control system for a gas wall-mounted boiler provided by the present invention.

[0022] Description of Figure Numbers:

[0023]

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] At present, with the advancement of science and technology, there are more and more fully premixed wall-mounted boilers with adaptive combustion adjustment functions. For this type of fully premixed wall-mounted boilers, most of them on the market judge and automatically adjust the ratio of gas to air based on the ion current of the combustion flame. For example, the adaptive control method and system of wall-mounted boilers disclosed in patent documents "CN117722772A" and "CN112524810A" use ion sensing needles to detect the size and change trend of the flame ion current and adjust the ratio of gas to air in the wall-mounted boiler burner.

[0029] However, first of all, the relationship between ion current and air-fuel ratio is only a changing trend. It is a relationship fitted by R&D personnel after testing a large amount of data. The relationship obtained after fitting will have some deviations from the specific corresponding relationship in actual use, and is not representative. Secondly, the ion sensing needle will work at high temperature for a long time, and there will be a certain degree of oxidation, and some combustion products will also adhere to the burner surface of the wall-mounted boiler, which will affect the accuracy of the ion sensing needle in detecting the flame ion current. Moreover, the determination of the ion current will produce errors due to factors such as the measurement environment and the measurement method, resulting in inaccurate air-fuel ratio data in the wall-mounted boiler, making it impossible to keep the wall-mounted boiler in a state of high combustion efficiency.

[0030] In addition, some fully premixed wall-mounted boilers use oxygen sensors or carbon dioxide sensors in the flue gas to determine the air-fuel ratio state, but the effective service life of these sensors is relatively short and they have not yet been stably applied to wall-mounted boiler products.

[0031] In view of this, the present invention provides a gas wall-mounted boiler adaptive control method, please refer to Figure 1 The gas wall-mounted boiler adaptive control method comprises the following steps:

[0032] Step S1, running the gas wall-mounted boiler, obtaining the calorific value composition of the gas before the gas and the supporting gas are mixed, or the calorific value composition of the mixed gas formed after the gas and the supporting gas are mixed, through a gas calorific value meter, to obtain the real-time calorific value composition;

[0033] Step S2, calculating the efficient air-fuel ratio at least according to the real-time calorific value component, and adjusting / determining the gas flow / gas volume, and / or the supporting gas flow / supporting gas volume in real time according to the efficient air-fuel ratio;

[0034] The gas wall-mounted boiler adaptive control method further includes a gas calorific value meter zeroing method, and the gas calorific value meter zeroing method includes the following steps:

[0035] Step S2', close the gas valve, and use auxiliary gas / air to replace the gas in the gas calorific value meter, so as to zero the gas calorific value meter through the auxiliary gas / air, wherein the gas wall-mounted boiler also includes a mixer, the gas valve and a combustion chamber, the mixer has a first input end, a second input end and an output end, the first input end is connected to the auxiliary gas pipeline, the second input end is connected to the gas pipeline, the output end is connected to the mixing pipeline, the mixing pipeline is connected to the combustion chamber, the gas pipeline includes a first section of the pipeline connected to the upstream end of the gas valve, and a second section of the pipeline connected to the downstream end of the gas valve, and the gas calorific value meter is arranged in the second section of the pipeline or the mixing pipeline.

[0036] In the technical solution of the present invention, the real-time calorific value component directly affects the amount of gas flow / gas volume involved in complete combustion. The real-time calorific value component is obtained through a gas calorific value meter, and the efficient air-fuel ratio is calculated based on the real-time calorific value component, that is, the air-fuel ratio when the gas can be fully burned, and then the gas flow / gas volume and / or the auxiliary gas flow / auxiliary gas volume are adjusted / determined in real time. In this way, it can well adapt to the influence of gas component differences on thermal efficiency, achieve high efficiency, energy saving and low pollution in gas combustion, ensure that the wall-mounted boiler is in the best combustion state in real time, and can adapt to the influence of gas components brought about by the future trend of hydrogen blending of natural gas; compared with the conventional method of judging and adjusting the air-fuel ratio based on the ion current of the combustion flame, oxygen sensor or carbon dioxide sensor, the accuracy of the data obtained is higher, and the accuracy of the data after long-term operation can be better guaranteed. At the same time, the air-fuel ratio of the wall-mounted boiler can be quickly and accurately adaptively adjusted, and no professional personnel are required to debug the combustion air-fuel ratio during production and installation. In addition, the adaptive control method for a gas wall-mounted boiler provided by the present invention also includes a gas calorific value meter zeroing method, which realizes zeroing the gas calorific value meter by replacing the gas in the gas calorific value meter with auxiliary gas, so as to calibrate the standard operating condition and abnormal operating condition of the gas calorific value meter, and determine the data of the gas calorific value meter in normal operation and abnormal operation, so as to facilitate adaptive adjustment of the gas calorific value meter when it is in an abnormal operating condition, thereby ensuring the measurement accuracy of the gas calorific value meter, and further ensuring the accuracy of air-fuel ratio judgment and adjustment of the gas wall-mounted boiler.

[0037] It should be noted that the calorific value components are the concentrations of the various components of the combustibles in the fuel gas, and the calorific value can be calculated based on the concentrations of the various components. In addition, when the fuel gas calorific value meter is installed in the second section of the pipeline, the fuel gas calorific value meter measures the fuel gas calorific value components before the fuel gas and the supporting fuel gas are mixed, and when the fuel gas calorific value meter is installed in the mixing pipeline, the fuel gas calorific value meter measures the calorific value components of the mixed gas formed after the fuel gas and the supporting fuel gas are mixed.

[0038] It should also be noted that, in the present invention, the "real-time adjustment / determination of gas flow / gas volume, and / or gas-supporting gas flow / gas-supporting gas volume" can be understood as: the gas-supporting gas flow / gas-supporting gas volume can remain unchanged, and the ratio of gas to gas-supporting gas in the mixed gas is only adjusted by real-time adjustment / determination of the gas flow / gas volume; the gas flow / gas volume can also remain unchanged, and the ratio of gas to gas-supporting gas in the mixed gas is only adjusted by real-time adjustment / determination of the gas-supporting gas flow / gas-supporting gas volume; of course, the gas flow / gas volume and the gas-supporting gas flow / gas volume can also be adjusted / determined in real time at the same time to achieve the adjustment of the ratio of gas to gas-supporting gas in the mixed gas.

[0039] Furthermore, in the adjustment / determination, "adjustment" can be understood as correction based on the original flow rate / volume, and "determination" can be understood as directly obtaining the flow rate / volume data output.

[0040] Furthermore, the flow rate is the volume of the gas / fuel-supporting gas flowing in per unit time, and the volume is the size of the space of the gas / fuel-supporting gas in the pipeline.

[0041] It should also be noted that, in the present invention, the combustion-supporting gas may be pure oxygen, air, or oxygen-enriched air mixed with air containing more than 50% oxygen. Furthermore, the "using combustion-supporting gas / air to replace the gas in the gas calorific value meter" can be understood as: using combustion-supporting gas to replace the gas in the gas calorific value meter, or using air to replace the gas in the gas calorific value meter; and in one embodiment, when the combustion-supporting gas is oxygen-enriched air, air can be used to replace the gas in the gas calorific value meter. At the same time, the replacement of the gas in the gas calorific value meter by the combustion-supporting gas / air can be achieved by self-diffusion or by a blower or other mechanism.

[0042] For further information, see Figure 1 , before step S2', the step further includes:

[0043] Step S1 ′, acquiring ion current data in real time, and confirming whether the gas calorific value meter needs to be calibrated based on the ion current data and the efficient air-fuel ratio calculated at least based on the real-time calorific value components.

[0044] In this way, the working condition of the gas calorific value meter is judged in real time by combining the ion current data and the real-time calorific value component, which is suitable for judging when the gas calorific value meter needs to be calibrated. Here, the ion current data only plays an auxiliary judgment role, so there is no need to make too many requirements on its data accuracy.

[0045] Furthermore, the step S1' specifically includes:

[0046] Step S11 ′, acquiring the ion current data in real time through an ion current sensor, and calculating the ion current data through an ion current algorithm model to obtain a calculated air-fuel ratio α′.

[0047] Step S12', real-time acquisition of gas flow / gas volume, and combustion-supporting gas flow / combustion-supporting gas volume, to obtain real-time gas flow / real-time gas volume, and real-time combustion-supporting gas flow / real-time combustion-supporting gas volume, and calculation of real-time air-fuel ratio α based on the real-time gas flow / real-time gas volume, the real-time combustion-supporting gas flow / real-time combustion-supporting gas volume, and the real-time gas composition.

[0048] In this step, the gas flow / gas volume can be directly obtained through a gas flow meter, or indirectly obtained through an auxiliary gas flow meter and a mixed gas flow meter, that is, the difference between the measurement data of the mixed gas flow meter and the measurement data of the auxiliary gas flow meter.

[0049] Similarly, the combustion gas flow / combustion gas volume can be directly obtained through the combustion gas flow meter, or indirectly obtained through the gas flow meter and the mixed gas flow meter, that is, the difference between the measurement data of the mixed gas flow meter and the measurement data of the gas flow meter.

[0050] Step S13', comparing the real-time air-fuel ratio α with the calculated air-fuel ratio α' to confirm whether the gas calorific value meter needs to be calibrated.

[0051] In this step, the working condition of the gas calorific value meter is judged by the air-fuel ratio difference in combination with the ion current data measured by the ion current sensor, thereby improving accuracy.

[0052] Furthermore, the step S13' specifically includes:

[0053] Step S131', determine whether it is greater than a first preset threshold;

[0054] Step S132': if yes, calibrate the gas calorific value meter; if no, repeat steps S11'-S12'.

[0055] In this way, during the judgment process, a certain margin can be left for the accuracy of the ion current data.

[0056] It should be noted that in this step, When the temperature is greater than a first preset threshold and the gas wall-mounted boiler is in an idle state or reaches a preset temperature in a heating mode, the gas calorific value meter is calibrated to avoid affecting normal use by users.

[0057] For details, please refer to Figure 1 , the step S1' further comprises:

[0058] Step S3', obtaining the number n of times the gas calorific value meter performs instant calibration within the preset calibration period, and determining whether the number n is less than a second preset threshold;

[0059] Step S4': If yes, repeat the steps S1' and S2'; if no, confirm that the ion current data is abnormal and correct the ion current data.

[0060] In this way, the abnormality of the ion current data is determined based on the abnormality of the calibration times within the preset calibration period, thereby ensuring the accuracy of the ion current data and avoiding abnormal calibration of the gas calorific value meter.

[0061] Furthermore, in one embodiment of the present invention, the second preset threshold is set to 3, that is, when n≥3, the ion current data is confirmed to be abnormal and the ion current data is corrected. When n<3, steps S1' and S2' are repeated to judge and calibrate the gas calorific value meter normally.

[0062] Specifically, the step S2' includes:

[0063] According to a preset calibration cycle, the gas valve is closed regularly, and the gas in the gas calorific value meter is replaced by the auxiliary combustion gas, so as to regularly zero the gas calorific value meter by the auxiliary combustion gas.

[0064] In this way, by regularly controlling the working state of the gas valve, that is, controlling the charging condition of the combustion-supporting gas, and coordinating with the gas calorific value meter to perform regular calibration, the measurement accuracy of the gas calorific value meter is ensured.

[0065] It should be noted that, in the present invention, the gas calorific value meter can be calibrated both periodically and in real time to further ensure the accuracy of the measurement data of the gas calorific value meter.

[0066] Furthermore, the preset calibration period is a certain regular time or a certain usage time.

[0067] It should be noted that the certain regular time, that is, regardless of whether the gas wall-mounted boiler is used or not, is calculated according to the normal time, and the calculation method is simple; and the certain usage time, that is, calculated according to the usage time of the gas wall-mounted boiler, that is, the time when the gas wall-mounted boiler is in a non-operating state is deleted from the normal time, and only the time when the gas wall-mounted boiler is in an operating state is included, which can avoid calibration when the user is using it, affecting the user's use.

[0068] Specifically, the preset calibration period is determined by learning the user's usage habits, so as to avoid affecting the user's use of the gas wall-mounted boiler and improve the user's usage experience.

[0069] Furthermore, the user's usage habits are learned at the initial stage of use of the gas wall-mounted boiler. Thus, the calorific value meter can be used for learning during the period when it does not need to be zeroed, i.e., at the initial stage of use, to avoid interference between the zeroing process and the learning process.

[0070] Specifically, in an embodiment of the present invention, the step S2' specifically includes:

[0071] The gas valve is closed by a manual switch or a control switch, and the fan is controlled to deliver supporting combustion gas into the gas pipeline, so as to zero the gas calorific value meter by the supporting combustion gas.

[0072] In this step, the user can manually zero the gas calorific value meter according to actual usage requirements to improve practicality and user experience.

[0073] Specifically, in an embodiment of the present invention, the step S2' specifically includes:

[0074] The gas valve is closed, and the auxiliary gas / air is driven by a fan to replace the gas in the gas calorific value meter.

[0075] In this way, the fan not only has the function of adjusting the flow rate / volume of the combustion-supporting gas, but also has the function of assisting zeroing, thereby simplifying the structure of the gas-fired wall-mounted boiler and reducing costs. In this step, the fan can be used to first extract the gas in the gas calorific value meter, and then fill the combustion-supporting gas / air into the gas calorific value meter; of course, it can also be that after the gas in the gas calorific value meter is freely diffused outward, the fan is used to fill the combustion-supporting gas / air into the gas calorific value meter.

[0076] The present invention also provides a gas wall-mounted boiler adaptive control system 100, see Figure 2 The gas wall-mounted boiler adaptive control system 100 includes a combustion chamber, a mixer 1, a gas valve 2, a gas calorific value meter 3 and a controller. The mixer 1 has a first input end, a second input end and an output end. The first input end is connected to a fuel gas pipeline, the second input end is connected to a gas pipeline, and the output end is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section of the pipeline and a second section of the pipeline; the gas valve 2 is arranged on the gas pipeline, and its upstream end is connected to the first section of the pipeline, and its downstream end is connected to the second section of the pipeline. The gas valve 2 is used to adjust the gas flow rate / gas volume; the gas calorific value meter 3 is arranged on the second section of the pipeline or the mixing pipeline, and is used to detect the calorific value components of the gas in real time; the controller is electrically connected to the gas valve 2 and the gas calorific value meter 3, and is used to obtain and process signal data to execute the above-mentioned gas wall-mounted boiler adaptive control method.

[0077] In this way, by setting the gas calorific value meter 3 to measure in real time the calorific value composition of the gas before the gas and the combustion-supporting gas are mixed, or the calorific value composition of the mixed gas formed after the gas and the combustion-supporting gas are mixed, the air-fuel ratio can be quickly and accurately adaptively adjusted, and the gas flow rate / gas volume and / or the combustion-supporting gas flow rate / combustion-supporting gas volume can be adjusted / determined in real time. This can well adapt to the influence of gas composition differences on thermal efficiency, and can adapt to the influence of gas composition brought about by the future trend of hydrogen blending of natural gas, so as to achieve efficient, energy-saving and low-pollution gas combustion, and ensure that the wall-mounted boiler is in the best combustion condition in real time. Compared with the existing wall-mounted boiler that uses the ion current data measured by the ion current sensor to judge and adjust the air-fuel ratio, the data measured and calculated by the wall-mounted boiler combustion control component 100 provided by the present invention is more accurate, and can better guarantee the accuracy of the data after long-term operation.

[0078] At the same time, the gas calorific value meter can be zeroed by closing the gas valve and replacing the gas in the gas calorific value meter with auxiliary gas, so as to calibrate the standard operating condition and abnormal operating condition of the gas calorific value meter, and determine the data of the gas calorific value meter in normal operation and abnormality, so as to facilitate adaptive adjustment of the gas calorific value meter when it is in an abnormal operating condition, thereby ensuring the measurement accuracy of the gas calorific value meter, and further ensuring the accuracy of the air-fuel ratio judgment and adjustment of the gas wall-mounted boiler.

[0079] Furthermore, the gas wall-mounted boiler adaptive control system 100 further includes a gas-supporting gas flow meter 4, which is arranged on the gas-supporting gas pipeline, and the controller is electrically connected to the gas-supporting gas flow meter 4. Thus, by arranging the gas-supporting gas flow meter 4, the gas-supporting gas flow rate / gas-supporting gas volume can be collected, with high measurement accuracy and low cost.

[0080] Specifically, the gas wall-mounted boiler adaptive control system 100 further includes a gas flow meter 5, the gas flow meter 5 is provided in the gas pipeline, and the controller is electrically connected to the gas flow meter 5. Thus, by providing the gas flow meter 5, the gas flow / gas volume can be collected with high measurement accuracy and low cost.

[0081] It should be noted that, in the present invention, the above two technical features can be set either one or both. Figure 2 In one embodiment of the present invention, the above two technical features are set at the same time, that is, the gas wall-mounted boiler adaptive control system 100 also includes a combustion-supporting gas flow meter 4 and a gas flow meter 5, the combustion-supporting gas flow meter 4 is arranged on the combustion-supporting gas pipeline, the gas flow meter 5 is arranged on the gas pipeline, and the controller is electrically connected to the combustion-supporting gas flow meter 4 and the gas flow meter 5.

[0082] For further information, see Figure 2 In one embodiment of the present invention, the mixer 1 is a Venturi premixer, and the first input end 11 is connected to the auxiliary gas flow meter 454 , and the second input end 12 is connected to the gas flow meter 55 .

[0083] Specifically, in one embodiment of the present invention, the gas wall-mounted boiler adaptive control system 100 also includes a manual switch, which is connected to the gas valve 2 to control the working state of the gas valve 2 and to replace the gas in the gas calorific value meter 3 with auxiliary gas / air; in this way, the user can manually zero the gas calorific value meter according to actual usage needs, thereby improving practicality and user experience.

[0084] In another embodiment of the present invention, the gas wall-mounted boiler adaptive control system 100 also includes a control switch, which is electrically connected to the controller and is used to transmit a control signal to the controller so that the controller receives the control signal to control the working state of the gas valve 2 and control the auxiliary gas / air to replace the gas in the gas calorific value meter 3; in this way, the controller can periodically zero the gas calorific value meter according to actual usage.

[0085] For details, please refer to Figure 2 The gas wall-mounted boiler adaptive control system 100 further includes a fan 6, which is provided in the mixer 1 and is used to adjust the flow rate / volume of the supporting gas; the controller is electrically connected to the fan 6. The fan 6 is used to achieve real-time adjustment of the gas flow rate / volume of the supporting gas and / or the flow rate / volume of the supporting gas. In addition, the fan 6 can also be used to replace the gas in the gas calorific value meter 3 with supporting gas / air, achieve zeroing of the gas calorific value meter 3, simplify the structure of the gas wall-mounted boiler, and reduce costs.

[0086] More specifically, in one embodiment of the present invention, the fan 6 is a full premix fan.

[0087] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gas wall-mounted boiler adaptive control method, characterized in that: The gas wall-mounted boiler adaptive control method comprises the following steps: Step S1, running the gas wall-mounted boiler, obtaining the calorific value composition of the gas before the gas and the supporting gas are mixed, or the calorific value composition of the mixed gas formed after the gas and the supporting gas are mixed, through a gas calorific value meter, to obtain the real-time calorific value composition; Step S2, calculating the efficient air-fuel ratio at least according to the real-time calorific value component, and adjusting / determining the gas flow / gas volume, and / or the supporting gas flow / supporting gas volume in real time according to the efficient air-fuel ratio; The gas wall-mounted boiler adaptive control method further includes a gas calorific value meter zeroing method, and the gas calorific value meter zeroing method includes the following steps: Step S2', close the gas valve, and use supporting gas / air to replace the gas in the gas calorific value meter to zero the gas calorific value meter through the supporting gas, wherein the gas wall-mounted boiler also includes a mixer, the gas valve and a combustion chamber, the mixer has a first input end, a second input end and an output end, the first input end is connected to the supporting gas pipeline, the second input end is connected to the gas pipeline, the output end is connected to a mixing pipeline, the mixing pipeline is connected to the combustion chamber, the gas pipeline includes a first section of the pipeline connected to the upstream end of the gas valve, and a second section of the pipeline connected to the downstream end of the gas valve, and the gas calorific value meter is arranged in the second section of the pipeline or the mixing pipeline.

2. The adaptive control method for a gas wall-mounted boiler according to claim 1, characterized in that: Before step S2', the following steps are also included: Step S1 ′, acquiring ion current data in real time, and confirming whether the gas calorific value meter needs to be calibrated based on the ion current data and the efficient air-fuel ratio calculated at least based on the real-time calorific value components.

3. The adaptive control method for a gas wall-mounted boiler according to claim 2, characterized in that: The step S1' specifically includes: Step S11', acquiring the ion current data in real time through an ion current sensor, and calculating the ion current data through an ion current algorithm model to obtain a calculated air-fuel ratio α'; Step S12', real-time acquisition of gas flow / gas volume, and combustion-supporting gas flow / combustion-supporting gas volume, to obtain real-time gas flow / real-time gas volume, and real-time combustion-supporting gas flow / real-time combustion-supporting gas volume, and calculation of real-time air-fuel ratio α according to the real-time gas flow / real-time gas volume, the real-time combustion-supporting gas flow / real-time combustion-supporting gas volume, and the real-time gas composition; Step S13', comparing the real-time air-fuel ratio α with the calculated air-fuel ratio α' to confirm whether the gas calorific value meter needs to be calibrated.

4. The adaptive control method for a gas wall-mounted boiler according to claim 3, characterized in that: The step S13' specifically includes: Step S131', determine whether it is greater than a first preset threshold; Step S132': if yes, calibrate the gas calorific value meter; if no, repeat steps S11'-S12'.

5. The adaptive control method for a gas wall-mounted boiler according to claim 2, characterized in that: The step S1' further includes: Step S3', obtaining the number n of times the gas calorific value meter performs instant calibration within the preset calibration period, and determining whether the number n is less than a second preset threshold; Step S4': If yes, repeat the steps S1' and S2'; if no, confirm that the ion current data is abnormal and correct the ion current data.

6. The adaptive control method for a gas wall-mounted boiler according to claim 1, characterized in that: The step S2' specifically includes: According to a preset calibration cycle, the gas valve is closed regularly, and the gas in the gas calorific value meter is replaced with the auxiliary gas, so as to regularly zero the gas calorific value meter with the auxiliary gas; The preset calibration period is a certain regular time or a certain usage time; or the preset calibration period is determined by learning the user's usage habits.

7. The adaptive control method for a gas wall-mounted boiler according to claim 6, characterized in that: The user's usage habits are learned at the initial stage of using the gas wall-mounted boiler.

8. The adaptive control method for a gas wall-mounted boiler according to claim 1, characterized in that: The step S2' specifically includes: Control the gas valve to close by a manual switch or a control switch, and control the fan to deliver the supporting combustion gas into the gas pipeline, so as to zero the gas calorific value meter by the supporting combustion gas; or The gas valve is closed, and the auxiliary gas is driven by a fan to replace the gas in the gas calorific value meter.

9. A gas wall-mounted boiler adaptive control system, characterized in that: include: Combustion chamber; A mixer having a first input end, a second input end and an output end, wherein the first input end is connected to a combustion-aiding gas pipeline, the second input end is connected to a gas pipeline, the output end is connected to a mixing pipeline, the mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section of pipeline and a second section of pipeline; A gas valve is provided on the gas pipeline, and its upstream end is connected to the first section of the pipeline, and its downstream end is connected to the second section of the pipeline, and the gas valve is used to adjust the gas flow rate / gas volume; A gas calorific value meter, provided in the second section of the pipeline or the mixing pipeline, for detecting the calorific value components of the gas in real time; and The controller is electrically connected to the gas valve and the gas calorific value meter, and is used to obtain and process signal data to execute the adaptive control method for the gas wall-mounted boiler according to any one of claims 1 to 8.

10. The adaptive control system for a gas wall-mounted boiler according to claim 9, characterized in that: The gas wall-mounted boiler adaptive control system further includes a gas-supporting gas flow meter, the gas-supporting gas flow meter is arranged on the gas-supporting gas pipeline, and the controller is electrically connected to the gas-supporting gas flow meter; and / or, The adaptive control system for the gas wall-mounted boiler also includes a gas flow meter, which is arranged on the gas pipeline, and the controller is electrically connected to the gas flow meter.

11. The adaptive control system for a gas wall-mounted boiler according to claim 10, characterized in that: The gas wall-mounted boiler adaptive control system further comprises a manual switch, which is connected to the gas valve to control the working state of the gas valve and to replace the gas in the gas calorific value meter with auxiliary gas / air; or, The gas wall-mounted boiler adaptive control system also includes a control switch, which is electrically connected to the controller and is used to transmit a control signal to the controller, so that the controller receives the control signal to control the working state of the gas valve and control the auxiliary gas / air to replace the gas in the gas calorific value meter; or, The gas wall-mounted boiler adaptive control system further comprises a fan, which is arranged in the mixer and is used to adjust the flow rate / volume of the supporting combustion gas; The controller is electrically connected to the fan.

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