Wall-hanging stove combustion control method, controller and stove combustion control assembly

Abstract

The invention discloses a wall-hanging stove combustion control method, a controller and a stove combustion control assembly, and relates to the technical field of wall-hanging stove combustion control, and the wall-hanging stove combustion control method comprises the following steps: obtaining a fuel gas calorific value component before fuel gas and combustion-supporting gas are mixed or a calorific value component of mixed gas formed after the fuel gas and the combustion-supporting gas are mixed in real time; obtaining a real-time calorific value component; the efficient air-fuel ratio is calculated according to the real-time calorific value components; according to the efficient air-fuel ratio, the gas flow / gas volume and / or the combustion-supporting gas flow / combustion-supporting gas volume are adjusted / determined in real time; in this way, 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, the influence of gas component difference on heat efficiency is well adapted, quick and accurate self-adaptive adjustment of the air-fuel ratio of the wall-hanging stove is achieved, and professional personnel do not need to debug the combustion air-fuel ratio during production and installation.

Description

Technical Field

[0001] The invention relates to the technical field of wall-mounted boiler combustion control, and in particular to a wall-mounted boiler combustion control method, a controller and a boiler combustion control component. Background Art

[0002] In the past, the combustion control components of wall-mounted boilers on the market were basically developed and tested under standard experimental environments to determine the gas-to-air ratio. The air-to-fuel ratio under different heat loads was a fixed value, which could achieve efficient combustion. Due to differences in the production process, installation scenarios, and different pipeline gases, the actual air-to-fuel ratio will change significantly, deviating from the optimal air-to-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-to-fuel ratio combustion debugging, 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 effect 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. In theory, there is no need to debug the air-fuel ratio during production and installation; but the relationship between the ion current and the air-fuel ratio is only a trend of change. 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.

[0004] In addition, patent No. CN211261241U uses the detection of ion current as the main basis for judgment to adjust the fan and gas valve. In actual use, this control algorithm idea will be affected by factors such as the ion current changing with the combustion conditions, gas source, external environment humidity, and ion current detection accuracy, resulting in relatively large errors. In addition, the influence of machine use time may also cause errors.

[0005] Patent No. CN112524810B determines the air-fuel ratio by detecting the ion current and further determines the air-fuel ratio of combustion by detecting the oxygen content in the exhaust. This method still has the problem of ion current aging and oxygen sensor damage or inaccurate detection due to excessive water vapor content. Summary of the invention

[0006] The main purpose of the present invention is to provide a wall-mounted boiler combustion control method, a controller and a furnace combustion control component, aiming to solve the above-mentioned problems.

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

[0008] Real-time acquisition of 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, to obtain the real-time calorific value composition;

[0009] Calculate the efficient air-fuel ratio according to the real-time calorific value components;

[0010] The gas flow rate / gas volume and / or the auxiliary gas flow rate / auxiliary gas volume are adjusted / determined in real time according to the efficient air-fuel ratio.

[0011] The present invention also provides a wall-mounted boiler controller, which is used to communicate with external equipment, store instructions, and execute the wall-mounted boiler combustion control method.

[0012] The present invention also provides a wall-mounted boiler combustion control component, the wall-mounted boiler combustion control component 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 gas pipeline, the second input end is connected to a combustion gas pipeline, and the output end is connected to the combustion chamber;

[0015] a gas valve, arranged on the gas pipeline; and

[0016] The gas calorific value meter is connected to the second input end of the mixer or to the output end of the mixer, and is used to obtain the calorific value components of the gas before the gas and the supporting gas are mixed, or the calorific value components of the mixed gas formed after the gas and the supporting gas are mixed in real time.

[0017] 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. By obtaining the real-time calorific value component and calculating the efficient air-fuel ratio according to the real-time calorific value component, that is, the air-fuel ratio when the gas can be fully burned, the gas flow / gas volume and / or the auxiliary gas flow / auxiliary gas volume are adjusted / determined in real time. In this way, efficient, energy-saving and low-pollution gas combustion is achieved, ensuring that the wall-mounted boiler is in the best combustion state in real time, well adapting to the influence of gas component differences on thermal efficiency, and being able to 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 according to the ion current of the combustion flame, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A flow chart of an embodiment of a combustion control method for a wall-mounted boiler provided by the present invention;

[0020] Figure 2 A flow chart of another embodiment of the combustion control method for a wall-mounted boiler provided by the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of the process of step S1;

[0022] Figure 4 A schematic diagram of the structure of a combustion control assembly for a wall-mounted boiler provided by the present invention;

[0023] Figure 5 for Figure 4 A partial structural diagram of the combustion control assembly of the middle wall-mounted boiler;

[0024] Figure 6 for Figure 5 Exploded diagram of

[0025] Figure 7 for Figure 5 A cross-sectional view of

[0026] Figure 8 for Figure 4 A cross-sectional view of a portion of the structure of a combustion control assembly of a medium wall-mounted boiler;

[0027] Fig. 9 for Figure 4 An exploded view of part of the structure of the combustion control assembly of the middle wall-mounted boiler;

[0028] Fig.10 for Figure 4 A cross-sectional view of part of the structure of the combustion control assembly of a medium wall-mounted boiler.

[0029] Description of Figure Numbers:

[0030]

[0031]

[0032] 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In the past, the combustion control components of wall-mounted boilers on the market were basically developed and tested under standard experimental environments to determine the gas-to-air ratio. The air-to-fuel ratio under different heat loads was a fixed value, which could achieve efficient combustion. Due to differences in the production process, installation scenarios, and different pipeline gases, the actual air-to-fuel ratio will change significantly, deviating from the optimal air-to-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-to-fuel ratio combustion debugging, 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 effect cannot be fully achieved.

[0037] 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. In theory, there is no need to debug the air-fuel ratio during production and installation; but the relationship between the ion current and the air-fuel ratio is only a trend of change. 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.

[0038] In view of this, the present invention provides a combustion control method for a wall-mounted boiler. Figures 1 to 3 The present invention provides a flow chart of the combustion control method of the wall-mounted boiler.

[0039] See also Figure 1 and Figure 5 , the wall-mounted boiler combustion control method comprises the following steps:

[0040] Step S3, real-time acquisition of the calorific value composition of the fuel gas before the fuel gas and the combustion-supporting gas are mixed, or the calorific value composition of the mixed gas formed after the fuel gas and the combustion-supporting gas are mixed, to obtain the real-time calorific value composition.

[0041] Specifically, in one embodiment of the present invention, the real-time calorific value component is measured by a gas calorific value meter. More specifically, the wall-mounted boiler combustion control assembly includes a combustion chamber, a mixer, a gas valve and a gas calorific value meter. The first input end of the mixer is connected to a fuel gas pipeline, the second input end of the mixer is connected to a gas pipeline, and the first output end and the second input end are respectively connected to the combustion chamber, and the gas calorific value meter is connected to the second input end or to the output end of the mixer. In this way, when the gas calorific value meter is connected to the second input end, it can be used to obtain the calorific value component of the gas before the gas and the fuel gas are mixed in real time. When the gas calorific value meter is connected to the output end of the mixer, it can be used to obtain the calorific value component of the mixed gas formed after the gas and the fuel gas are mixed in real time.

[0042] Step S6: Calculate the efficient air-fuel ratio according to the real-time calorific value components.

[0043] Step S7: adjusting / determining the gas flow / gas volume and / or the gas-supporting gas flow / gas-supporting gas volume in real time according to the efficient air-fuel ratio.

[0044] 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. By obtaining the real-time calorific value component and calculating the efficient air-fuel ratio according to the real-time calorific value component, that is, the air-fuel ratio when the gas can be fully burned, the gas flow / gas volume and / or the auxiliary gas flow / auxiliary gas volume are adjusted / determined in real time. In this way, efficient, energy-saving and low-pollution gas combustion is achieved, ensuring that the wall-mounted boiler is in the best combustion state in real time, well adapting to the impact of gas component differences on thermal efficiency, and adapting to the impact 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 according to the ion current of the combustion flame, 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.

[0045] It should be noted that the calorific value components are the concentrations of various components of the combustibles in the fuel gas, and the calorific value can be calculated based on the concentrations of various components.

[0046] 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.

[0047] In addition, 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.

[0048] 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.

[0049] For further information, see Figure 2 , before step S6, the step further includes:

[0050] Step S4: Obtain the gas flow rate / gas volume in real time to obtain the real-time gas flow rate / real-time gas volume.

[0051] In this step, the gas flow / gas volume can be directly obtained in real time through the gas flow meter, which is installed in the gas pipeline; the gas flow / gas volume can also be obtained in real time through the auxiliary gas flow meter and the mixed gas flow meter, and the difference between the data measured by the mixer flow meter and the auxiliary gas flow meter is the gas flow / gas volume, the auxiliary gas flow meter is installed in the auxiliary gas pipeline, and the mixer flow meter is installed at the output end of the mixer. And because the flow meter has a suitable working environment and mature technology, it can ensure the accuracy of data after long-term operation.

[0052] The step S6 specifically includes:

[0053] The efficient air-fuel ratio is calculated based on the real-time gas flow / real-time gas volume and the real-time calorific value component.

[0054] In this step, the gas flow rate / volume is closely and directly related to the efficient air-fuel ratio. Therefore, an air-fuel ratio data is first calculated based on the real-time gas flow rate / real-time gas volume, and then the air-fuel ratio data is corrected based on the real-time calorific value component. This can obtain more accurate air-fuel ratio data, namely the efficient air-fuel ratio, improve the accuracy of data calculation, and help improve the accuracy of subsequent adjustment / determination of the gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume, thereby improving the combustion efficiency of the gas.

[0055] For further information, see Figure 2 , before step S6, the step further includes:

[0056] Step S5: acquiring the combustion-supporting gas flow rate / combustion-supporting gas volume in real time to obtain the real-time combustion-supporting gas flow rate / real-time combustion-supporting gas volume.

[0057] In this step, the combustion gas flow rate / combustion gas volume can be directly measured by a combustion gas flow meter, which is arranged in the combustion gas pipeline; the combustion gas flow rate / combustion gas volume can also be obtained in real time by a gas flow meter and a mixed gas flow meter, and the difference between the data measured by the mixer flow meter and the data measured by the gas flow meter is the combustion gas flow rate / combustion gas volume, the gas flow meter is arranged in the gas pipeline, and the mixer flow meter is arranged at the output end of the mixer. And because the flow meter has a suitable working environment and mature technology, it can ensure the accuracy of data after long-term operation.

[0058] The step S7 specifically includes:

[0059] Step S71, calculating the real-time air-fuel ratio according to the real-time gas flow / real-time gas volume and the real-time combustion-supporting gas flow / real-time combustion-supporting gas volume.

[0060] In this step, the combustion gas flow rate / volume is also closely and directly related to the real-time air-fuel ratio. Therefore, based on the real-time gas flow rate / real-time gas volume, combined with the real-time combustion gas flow rate / real-time combustion gas volume calculation, more accurate and reliable real-time air-fuel ratio data can be obtained, making subsequent adjustments more accurate.

[0061] Step S72, comparing the real-time air-fuel ratio with the efficient air-fuel ratio; if the real-time air-fuel ratio is greater than the efficient air-fuel ratio, increasing the opening of the gas valve and / or reducing the output power of the full premixed fan to increase the gas flow / gas volume and / or reduce the combustion-supporting gas flow / combustion-supporting gas volume; if the real-time air-fuel ratio is less than the efficient air-fuel ratio, reducing the opening of the gas valve and / or increasing the output power of the full premixed fan to reduce the gas flow / gas volume and / or increase the combustion-supporting gas flow / combustion-supporting gas volume.

[0062] Specifically, the gas flow rate / gas volume is adjusted by the gas valve, that is, if the opening of the gas valve increases, the gas flow rate / gas volume increases, and if the opening of the gas valve decreases, the gas flow rate / gas volume decreases.

[0063] Specifically, the combustion-supporting gas flow rate / combustion-supporting gas volume is adjusted by a full premixed fan. When the output power of the full premixed fan increases, the combustion-supporting gas flow rate / combustion-supporting gas volume increases. When the output power of the full premixed fan decreases, the combustion-supporting gas flow rate / combustion-supporting gas volume decreases.

[0064] It should be noted that, in the present invention, the above two technical features can be set at the same time or one of them can be set selectively. Specifically, in one embodiment of the present invention, the above two technical features are set at the same time, that is, the gas flow / gas volume is adjusted by the gas valve, and the auxiliary gas flow / auxiliary gas volume is adjusted by the full premix fan. In this way, the real-time air-fuel ratio gradually becomes consistent with the high-efficiency air-fuel ratio, thereby ensuring efficient combustion of the gas.

[0065] More specifically, the gas valve is arranged on the gas pipeline, and the full premix fan is arranged on the mixer.

[0066] It should be noted that, by combining the calorific value composition of the gas and the gas flow / gas volume data, the real-time heat load of the wall-mounted boiler can be quickly and accurately calculated to achieve rapid constant temperature.

[0067] It should be noted that, in the present invention, the order of step S3, step S4, and step S5 described above is not limited. Step S3, step S4, and step S5 can be performed in any order, or step S4, step S3, and step S5 can be performed simultaneously.

[0068] Specifically, in the present invention, the combustion-supporting gas may be pure oxygen, or air mixed with oxygen.

[0069] For further information, see Figure 2 , before step S6, the step further includes:

[0070] Step S1, confirming the actual oxygen content in the air.

[0071] In this step, the oxygen content in the air in different regions is confirmed, and the air-fuel ratio is adjusted accordingly to reduce the impact of regional factors on combustion efficiency, thereby ensuring that the gas can be fully burned.

[0072] It should be noted that, in the present invention, the actual oxygen content in the air can be confirmed by any means, such as an oxygen flow meter, a pressure meter (the measured pressure data is combined with the regional altitude to calculate the oxygen content), etc.

[0073] Specifically, in one embodiment of the present invention, please refer to Figure 3 , the step S1 specifically includes:

[0074] Step S11, keep the gas flow rate / gas volume unchanged, adjust the air flow rate / air volume, and calculate the heat output power of the wall-mounted boiler corresponding to each air flow rate / air volume data to obtain the maximum heat output power.

[0075] More specifically, in one embodiment of the present invention, step S11 specifically includes:

[0076] Step S111: according to the preset oxygen content, real-time air flow / real-time air volume Q air , Real-time gas flow / real-time gas volume Q gas , water flow Q W , outlet water temperature T2 and return water temperature T1, calculate the first thermal output power P 输出 ;

[0077] Step S112: Maintain gas flow / gas volume Q gas Keep constant and gradually increase the air flow / air volume Q air , and calculate the second thermal output power P' 输出 , when the second thermal output power P' 输出 Less than or equal to the first thermal output power P 输出 , or the second thermal output power P' 输出 When it no longer increases with the increase of air flow rate / air volume, stop increasing the air flow rate / air volume;

[0078] Step S113: Maintain gas flow / gas volume Q gasUnchanged, gradually reducing air flow / air volume Q air , and calculate the third thermal output power P" 输出 , when the third thermal output power P" 输出 Less than or equal to the first thermal output power P 输出 When the air flow rate / air volume Q is reduced, air ;

[0079] Step S114: Compare the second heat output power P' 输出 and the third thermal output power P" 输出 , get the maximum thermal output power P 输出max .

[0080] Step S12: obtaining actual oxygen content data in the air according to the air flow / air volume data, the gas flow / gas volume data and the gas calorific value component data at the maximum heat output power.

[0081] It should be noted that, in one embodiment of the present invention, the preset oxygen content is 20.9%.

[0082] The step S6 specifically includes:

[0083] The efficient air-fuel ratio is calculated based on the real-time gas flow / real-time gas volume, the real-time calorific value component and the actual oxygen content data.

[0084] In this step, the efficient air-fuel ratio data calculated in combination with the oxygen content data in the air is more accurate and effective.

[0085] For details, please refer to Figure 2 In another embodiment of the present invention, before step S3, the step further includes:

[0086] Step S2: setting the initial air-fuel ratio.

[0087] The step S7 specifically includes:

[0088] Step S71', correcting the initial air-fuel ratio in real time according to the efficient air-fuel ratio to obtain a real-time air-fuel ratio.

[0089] Step S72', adjusting the fuel gas flow rate / fuel gas volume and / or the auxiliary gas flow rate / auxiliary gas volume in real time according to the real-time air-fuel ratio.

[0090] In this way, when delayed calculation occurs due to factors such as hardware devices, the data before correction, that is, the initial air-fuel ratio, can continue to be used.

[0091] It should be noted that the step S72' may specifically include:

[0092] judge whether it is greater than a first preset value, wherein α is the real-time air-fuel ratio, and α0 is the efficient air-fuel ratio;

[0093] If yes, adjust the gas flow / gas volume by adjusting the opening of the gas valve, or adjust the output power of the full premix fan to adjust the gas flow / gas volume. If no, repeat the previous step.

[0094] In this way, frequent adjustment of the gas flow / gas volume and the combustion-supporting gas flow / combustion-supporting gas volume can be avoided, and frequent adjustment of the gas valve and the full premix blower can be avoided, which affects the service life.

[0095] Furthermore, the step S2 specifically includes:

[0096] Step S21, obtaining the unit calorific value composition according to the gas flow rate per unit time and the gas calorific value composition / the mixed gas calorific value composition, or obtaining the unit calorific value composition according to the gas unit volume and the gas calorific value composition / the mixed gas calorific value composition.

[0097] Step S22, adjusting the ratio of the flow rate of the supporting gas per unit time to the unit volume of the supporting gas and the unit calorific value component, and monitoring the output power of the wall-mounted boiler corresponding to each ratio in real time to obtain the optimal output power of the wall-mounted boiler;

[0098] Step S23, directly setting the initial air-fuel ratio according to the supporting gas flow rate / supporting gas unit volume per unit time required by the ratio corresponding to the optimal output power, or replacing the original initial air-fuel ratio to obtain a new initial air-fuel ratio.

[0099] In this way, the precise actual oxygen content and initial air-fuel ratio are obtained, ensuring that the accuracy of the adaptive adjustment of the wall-mounted boiler is not affected by the oxygen content of the geographical environment.

[0100] Further, to facilitate understanding of the present invention, in one case, the step S22 specifically includes:

[0101] Step S221, monitoring the output power of the wall-mounted boiler corresponding to the unit calorific value component in step S11 to obtain a first output power P1;

[0102] Step S222, keep the gas flow rate / gas unit volume per unit time unchanged, gradually increase the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a second output power, and when the second output power P2 is less than or equal to the first output power P1, stop increasing the gas flow rate / gas unit volume per unit time (the specific adjustment process is shown in Table 1 below);

[0103] Step S223, keep the gas flow rate / gas unit volume per unit time unchanged, gradually reduce the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a third output power P3, and when the third output power P3 is less than or equal to the first output power P1, stop reducing the gas flow rate / gas unit volume per unit time (the specific adjustment process is shown in Table 1 below);

[0104] Step S224: Compare the second output power P2 and the third output power P3 to obtain the optimal output power.

[0105] In this way, the most efficient combustion and heat exchange operating point under the gas flow rate / gas unit volume in the unit time can be determined, and the corresponding parameters under the operating point can be used to calculate the actual oxygen content and the initial air-fuel ratio.

[0106] Table 1

[0107]

[0108] In another embodiment of the present invention, the step S22 specifically includes:

[0109] Step S221', monitoring the output power of the wall-mounted boiler corresponding to the unit calorific value component in step S11 to obtain a first output power;

[0110] Step S222', keep the gas flow rate / gas unit volume per unit time unchanged, gradually increase the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a second output power, and when the second output power no longer increases with the increase of the gas flow rate / gas unit volume per unit time, stop increasing the gas flow rate / gas unit volume per unit time;

[0111] Step S223', keep the gas flow rate / gas unit volume per unit time unchanged, gradually reduce the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a third output power, and when the third output power no longer increases with the decrease of the gas flow rate / gas unit volume per unit time, stop reducing the gas flow rate / gas unit volume per unit time;

[0112] Step S224: Compare the second output power and the third output power to obtain the optimal output power.

[0113] Furthermore, the calculation formula of the output power of the wall-mounted boiler is:

[0114] P 输出 =C×ρ×Q W ×(T2-T1);

[0115] Where P 输出 Output power for the wall-mounted boiler;

[0116] C is the specific heat capacity of water;

[0117] ρ is the density of water;

[0118] Q W is water flow / water volume;

[0119] T2 is the outlet water temperature;

[0120] T1 is the return water temperature.

[0121] More specifically, in one embodiment of the present invention, the water flow / water volume is obtained by a water flow meter, the outlet water temperature is obtained by an outlet water temperature sensor, and the return water temperature is obtained by a return water temperature sensor.

[0122] Specifically, based on the above-mentioned embodiments of "the combustion-supporting gas is air" and "before step S3, the step S2 further includes: setting an initial air-fuel ratio", step S2 specifically includes:

[0123] The initial air-fuel ratio is set according to the actual oxygen content in the air.

[0124] In this way, if the local ambient oxygen content is known, the initial air-fuel ratio setting can be completed by manually entering the oxygen content parameters, thereby canceling the adjustment process of the initial air-fuel ratio matching program and reducing energy consumption.

[0125] The present invention also provides a wall-mounted boiler controller, which is used to communicate with external equipment, store instructions, and execute the wall-mounted boiler combustion control method described above.

[0126] The present invention also provides a wall-mounted boiler combustion control assembly 100, see Figures 4 to 10 The wall-mounted boiler combustion control component 100 includes a combustion chamber, a mixer 1, a gas valve 2 and a gas calorific value meter 3. The mixer 1 has a first input end 11, a second input end 12 and an output end. The first input end 11 is connected to a combustion-supporting gas pipeline, the second input end 12 is connected to a gas pipeline, and the output end is connected to the combustion chamber; the gas valve 2 is arranged on the gas pipeline; the gas calorific value meter 3 is connected to the second input end 12 of the mixer 1 or to the output end of the mixer 1, and is used to obtain in real time the calorific value components of the gas before the gas and the combustion-supporting gas are mixed, or the calorific value components of the mixed gas formed after the gas and the combustion-supporting gas are mixed.

[0127] 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.

[0128] It should be noted that when the gas calorific value meter 3 is connected to the second input end 12, it can be used to obtain the calorific value components of the gas before the gas and the supporting gas are mixed in real time. When the gas calorific value meter 3 is connected to the output end of the mixer 1, it can be used to obtain the calorific value components of the mixed gas formed after the gas and the supporting gas are mixed in real time.

[0129] Furthermore, the wall-mounted boiler combustion control assembly 100 also includes a combustion-supporting gas flow meter 54, which is arranged on the combustion-supporting gas pipeline and is used to measure the combustion-supporting gas flow rate / combustion-supporting gas volume.

[0130] Specifically, the wall-mounted boiler combustion control component 100 further includes a gas flow meter 5, which is arranged in the gas pipeline and is used to measure the gas flow rate / gas volume.

[0131] It should be noted that, in the present invention, the above two technical features can be set at the same time, or one of them can be set selectively. For details, please refer to Figure 4 In one embodiment of the present invention, the above two technical features are set at the same time, that is, the wall-mounted boiler combustion control component 100 also includes a combustion-supporting gas flow meter 54 and a gas flow meter 5, the combustion-supporting gas flow meter 54 is arranged in the combustion-supporting gas pipeline, and the gas flow meter 5 is arranged in the gas pipeline.

[0132] For further information, see Figures 4 to 10 The mixer 1 is a Venturi mixer 1 , and the first input end 11 is connected to the auxiliary gas flow meter 54 , and the second input end 12 is connected to the gas flow meter 5 .

[0133] For details, please refer to Figures 5 to 7In one embodiment of the present invention, the inner peripheral wall of the second input end 12 of the mixer 1 is recessed to form a first slot 121, and the peripheral side wall of the second input end 12 is penetrated by a second slot 122 along the inward and outward directions, and the second slot 122 is arranged away from the mixing chamber of the mixer 1 relative to the first slot 121; a boss 51 is provided on the outer periphery of one end of the gas flow meter 5, and the boss 51 is adapted to be clamped in the first slot 121; a U-shaped pin 6 is provided on the outer periphery of the mixer 1, and the U-shaped pin 6 is clamped in the second slot 122, and the boss 51 is pressed into the first slot 121.

[0134] It should be noted that when assembling the mixer 1 and the gas flow meter 5, one end of the gas flow meter 5 is first inserted into the first slot 121, and then the U-shaped pin 6 is clamped in the second slot 122, so that the gas flow meter 5 is pressed under the action of the U-shaped pin 6 and the side wall of the first slot 121, thereby achieving reliable fixation of the gas flow meter 5, ensuring tightness, preventing gas leakage, and simple and convenient operation.

[0135] For further information, see Figure 7 A sealing ring 8 is provided between one end of the gas flow meter 5 inserted into the second input end 12 and the bottom wall of the first slot 121 .

[0136] For details, please refer to Fig. 9 and Fig.10 In one embodiment of the present invention, the first input end 11 of the mixer 1 is provided with at least one first inner side wall 111 and at least one first outer side wall 112, and the first outer side wall 112 is arranged at intervals on the outer periphery of the first inner side wall 111 to form a third slot with the first inner side wall 111; one end of the oxidizing gas flow meter 54 is provided with at least one second inner side wall 41 and at least one second outer side wall 42, and the second outer side wall 42 is arranged at intervals on the outer periphery of the second inner side wall 41 to form a fourth slot with the second inner side wall 41; the second inner side wall 41 is arranged in the third slot with interference fit, and the first outer side wall 112 is arranged in the fourth slot with interference fit, or the second outer side wall 42 is arranged in the third slot with interference fit, and the first inner side wall 111 is arranged in the fourth slot with interference fit. In this way, the oxidizing gas flow meter 54 is tightly installed, and because the oxidizing gas flow meter 54 is light in weight, its installation is more stable and reliable.

[0137] For details, please refer to Figure 8In one embodiment of the present invention, the gas calorific value meter 3 is inserted into the mixer 1 from the side wall of the second input end 12 through the Pitot tube 31, and is connected to the second input end 12 of the mixer 1 to obtain the calorific value components of the gas before the gas and the supporting gas are mixed in real time.

[0138] Specifically, in another embodiment of the present invention, the gas calorific value meter 3 is inserted into the mixer 1 from the side wall of the output end through the Pitot tube 31, and is connected to the output end of the mixer 1 to obtain the calorific value components of the mixed gas formed by mixing the gas and the supporting gas in real time.

[0139] At the same time, the gas calorific value meter 3 adopts the principle of the Pitot tube 31, the gas inlet is the total pressure, and the gas outlet is the static pressure. The gas enters the gas chamber of the gas calorific value meter 3 through the pressure difference, thereby avoiding direct series connection with the gas pipeline, greatly reducing space limitations, and allowing the gas calorific value meter 3 to be installed on a conventional full premixed wall-mounted boiler, and its external dimensions and core component installation can remain unchanged, which is convenient for the iterative application of new technologies and structures.

[0140] For details, please refer to Figure 4 The wall-mounted boiler combustion control component 100 also includes a full premixing fan 7, which is arranged in the mixer 1 and is used to charge the mixer 1 with combustion-supporting gas and adjust the air-fuel ratio.

[0141] Specifically, the wall-mounted boiler combustion control component 100 also includes a wall-mounted boiler controller, which is connected to the gas valve 2 and the gas calorific value meter 3 by signal. More specifically, the wall-mounted boiler controller and the gas valve 2 and the gas calorific value meter 3 can be connected by wire or by wireless. Further, the wall-mounted boiler controller is connected to the auxiliary gas flow meter 54, the gas flow meter 5, and the full premixed fan 7 by signal.

[0142] Furthermore, the gas pipeline includes a first section of the pipeline connected to the upstream end of the gas valve 2, and a second section of the pipeline connected to the downstream end of the gas valve 2. The gas calorific value meter 3 is arranged in the second section of the pipeline or the mixing pipeline, so that when the gas valve is in a closed state, the auxiliary fuel can be used to replace the gas in the gas calorific value meter.

[0143] In this way, the gas calorific value meter 3 is zeroed by closing the gas valve 2 and replacing the gas in the gas calorific value meter 3 with the auxiliary gas, so as to calibrate the standard operating condition and abnormal operating condition of the gas calorific value meter 3, and determine the data of the gas calorific value meter 3 in normal operation and abnormality, so as to facilitate adaptive adjustment of the gas calorific value meter 3 when it is in an abnormal operating condition, thereby ensuring the measurement accuracy of the gas calorific value meter 3, and further ensuring the accuracy of the air-fuel ratio judgment and adjustment of the wall-mounted boiler.

[0144] Furthermore, in one embodiment of the present invention, the wall-mounted boiler combustion control component 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 3 according to actual usage needs, thereby improving practicality and user experience.

[0145] In addition, based on the above-mentioned embodiment of "the wall-mounted boiler combustion control component 100 also includes a wall-mounted boiler controller, and the wall-mounted boiler controller is signal-connected to the gas valve 2 and the gas calorific value meter 3", the wall-mounted boiler combustion control component 100 also includes a control switch, and the control switch is signal-connected to the wall-mounted boiler controller for transmitting a control signal to the wall-mounted boiler controller, so that the wall-mounted boiler controller receives the control signal to control the working state of the gas valve 2, and controls the auxiliary gas / air to replace the gas in the gas calorific value meter 3; in this way, the wall-mounted boiler controller can periodically zero the gas calorific value meter 3 according to actual usage.

[0146] 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 combustion control method for a wall-mounted boiler, characterized in that: The wall-mounted boiler combustion control method comprises the following steps: Real-time acquisition of 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, to obtain the real-time calorific value composition; Calculate the efficient air-fuel ratio according to the real-time calorific value components; The gas flow rate / gas volume and / or the auxiliary gas flow rate / auxiliary gas volume are adjusted / determined in real time according to the efficient air-fuel ratio.

2. The combustion control method of a wall-mounted boiler according to claim 1, characterized in that: Before the step of calculating the efficient air-fuel ratio according to the real-time calorific value component, the following steps are further included: Obtain gas flow / gas volume in real time, and obtain real-time gas flow / real-time gas volume; The step of calculating the efficient air-fuel ratio according to the real-time calorific value component specifically includes: The efficient air-fuel ratio is calculated based on the real-time gas flow / real-time gas volume and the real-time calorific value component.

3. The combustion control method of a wall-mounted boiler according to claim 2, characterized in that: Before the step of calculating the efficient air-fuel ratio according to the real-time calorific value component, the following steps are further included: Obtain the combustion gas flow rate / combustion gas volume in real time, and obtain the real-time combustion gas flow rate / real-time combustion gas volume; The step of 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 specifically includes: The real-time air-fuel ratio is calculated based on the real-time gas flow / real-time gas volume and the real-time combustion-supporting gas flow / real-time combustion-supporting gas volume; Compare the real-time air-fuel ratio with the efficient air-fuel ratio. If the real-time air-fuel ratio is greater than the efficient air-fuel ratio, increase the opening of the gas valve and / or reduce the output power of the full premix fan to increase the gas flow / gas volume and / or reduce the combustion-supporting gas flow / combustion-supporting gas volume. If the real-time air-fuel ratio is less than the efficient air-fuel ratio, reduce the opening of the gas valve and / or increase the output power of the full premix fan to reduce the gas flow / gas volume and / or increase the combustion-supporting gas flow / combustion-supporting gas volume.

4. The combustion control method of a wall-mounted boiler according to claim 3, characterized in that: Obtain the gas flow / gas volume in real time through a gas flow meter, and obtain the supporting gas flow / supporting gas volume in real time through a supporting gas flow meter; or, The gas flow rate / gas volume and the supporting gas flow rate / supporting gas volume are obtained in real time through one of the gas flow meter and the supporting gas flow meter and the mixed gas flow meter.

5. The combustion control method for a wall-mounted boiler according to any one of claims 1 to 4, characterized in that: Adjust the gas flow / gas volume by means of a gas valve; and / or, The gas flow / gas volume is adjusted by the full premix fan.

6. The combustion control method of a wall-mounted boiler according to claim 2 or 3, characterized in that: The combustion-supporting gas is air; Before the step of calculating the efficient air-fuel ratio according to the real-time calorific value component, the following steps are further included: Confirm the actual oxygen content in the air; The step of calculating the efficient air-fuel ratio according to the real-time calorific value component specifically includes: The efficient air-fuel ratio is calculated based on the real-time gas flow / real-time gas volume, the real-time calorific value component and the actual oxygen content data.

7. The combustion control method for a wall-mounted boiler according to any one of claims 1 to 3, characterized in that: The step of obtaining the calorific value components of the gas before the gas and the combustion-supporting gas are mixed, or the calorific value components of the mixed gas formed after the gas and the combustion-supporting gas are mixed, before obtaining the real-time calorific value components, further includes: Set the initial air-fuel ratio; The step of 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 specifically includes: Correcting the initial air-fuel ratio in real time according to the efficient air-fuel ratio to obtain a real-time air-fuel ratio; The gas flow rate / gas volume and / or the auxiliary gas flow rate / auxiliary gas volume are adjusted in real time according to the real-time air-fuel ratio.

8. The combustion control method of a wall-mounted boiler according to claim 7, characterized in that: The step of setting the initial air-fuel ratio specifically includes: Obtaining the unit calorific value component according to the gas flow rate per unit time and the gas calorific value component / the mixed gas calorific value component, or obtaining the unit calorific value component according to the gas unit volume and the gas calorific value component / the mixed gas calorific value component; Adjust the ratio of the flow rate of the supporting gas / unit volume of the supporting gas per unit time to the unit calorific value component, and monitor the output power of the wall-mounted boiler corresponding to each ratio in real time to obtain the optimal output power of the wall-mounted boiler; According to the supporting gas flow rate / supporting gas unit volume per unit time required by the ratio corresponding to the optimal output power, the initial air-fuel ratio is directly set, or the original initial air-fuel ratio is replaced to obtain a new initial air-fuel ratio; The steps of adjusting the ratio of the flow rate of the supporting combustion gas per unit time to the unit volume of the supporting combustion gas and the unit calorific value component, and monitoring the output power of the wall-mounted boiler corresponding to each ratio in real time to obtain the optimal output power of the wall-mounted boiler specifically include: Monitor the output power of the wall-mounted boiler corresponding to the unit calorific value component in the step of obtaining the unit calorific value component according to the gas flow rate per unit time and the gas calorific value component / the calorific value component of the mixed gas, or obtaining the unit calorific value component according to the unit volume of the gas and the gas calorific value component / the calorific value component of the mixed gas, to obtain the first output power; Keep the gas flow rate / gas unit volume per unit time unchanged, gradually increase the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a second output power, and when the second output power is less than or equal to the first output power, stop increasing the gas flow rate / gas unit volume per unit time; Keep the gas flow rate / gas unit volume per unit time unchanged, gradually reduce the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a third output power, and when the third output power is less than or equal to the first output power, stop reducing the gas flow rate / gas unit volume per unit time; Comparing the second output power with the third output power to obtain the optimal output power; The steps of adjusting the ratio of the flow rate of the supporting combustion gas per unit time to the unit volume of the supporting combustion gas and the unit calorific value component, and monitoring the output power of the wall-mounted boiler corresponding to each ratio in real time to obtain the optimal output power of the wall-mounted boiler specifically include: Monitor the output power of the wall-mounted boiler corresponding to the unit calorific value component in the step of obtaining the unit calorific value component according to the gas flow rate per unit time and the gas calorific value component / the calorific value component of the mixed gas, or obtaining the unit calorific value component according to the unit volume of the gas and the gas calorific value component / the calorific value component of the mixed gas, to obtain the first output power; Keep the gas flow rate / gas unit volume per unit time unchanged, gradually increase the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a second output power, and when the second output power no longer increases with the increase of the gas flow rate / gas unit volume per unit time, stop increasing the gas flow rate / gas unit volume per unit time; Keep the gas flow rate / gas unit volume per unit time unchanged, gradually reduce the gas flow rate / gas unit volume per unit time, and monitor the output power of the wall-mounted boiler in real time to obtain a third output power, and when the third output power no longer increases with the decrease of the gas flow rate / gas unit volume per unit time, stop reducing the gas flow rate / gas unit volume per unit time; The second output power and the third output power are compared to obtain the optimal output power.

9. The combustion control method of a wall-mounted boiler according to claim 7, characterized in that: The combustion-supporting gas is air; The step of setting the initial air-fuel ratio specifically includes: The initial air-fuel ratio is set according to the actual oxygen content in the air.

10. A wall-mounted boiler controller, characterized in that: The wall-mounted boiler controller is used for communicating with external equipment, storing instructions, and executing the wall-mounted boiler combustion control method according to any one of claims 1-9.

11. A combustion control assembly for a wall-mounted boiler, characterized in that: The wall-mounted boiler combustion control assembly comprises: 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 gas pipeline, the second input end is connected to a combustion gas pipeline, and the output end is connected to the combustion chamber; a gas valve, arranged on the gas pipeline; and The gas calorific value meter is connected to the second input end of the mixer or to the output end of the mixer, and is used to obtain the calorific value components of the gas before the gas and the supporting gas are mixed, or the calorific value components of the mixed gas formed after the gas and the supporting gas are mixed in real time.

12. The combustion control assembly of a wall-mounted boiler according to claim 11, characterized in that: The combustion control assembly of the wall-mounted boiler further comprises a combustion-supporting gas flow meter, and the combustion-supporting gas flow meter is arranged on the combustion-supporting gas pipeline; and / or the combustion control assembly of the wall-mounted boiler further comprises a gas flow meter, and the gas flow meter is arranged on the gas pipeline; The combustion control assembly of the wall-mounted boiler further comprises a combustion-supporting gas flow meter and a gas flow meter, wherein the combustion-supporting gas flow meter is arranged on the combustion-supporting gas pipeline, and the gas flow meter is arranged on the gas pipeline; The mixer is a Venturi mixer, and the first input end is connected to the combustion gas flow meter, and the second input end is connected to the combustion gas flow meter.

13. The wall-mounted boiler combustion control assembly according to claim 11 or 12, characterized in that: The wall-mounted boiler combustion control assembly also includes a gas flow meter; The inner peripheral wall of the second input end of the mixer is recessed to form a first slot, and the peripheral side wall of the second input end is penetrated by a second slot in the inner and outer directions, and the second slot is arranged away from the mixing chamber of the mixer relative to the first slot; A boss is provided on the outer periphery of one end of the gas flow meter, and a card adapted to the boss is disposed in the first card slot; A U-shaped latch is provided on the outer periphery of the mixer, the U-shaped latch is locked in the second slot, and the boss is pressed into the first slot; The wall-mounted boiler combustion control assembly also includes a combustion-supporting gas flow meter; The first input end of the mixer is convexly provided with at least one first inner side wall and at least one first outer side wall, and the first outer side wall is arranged at an interval on the outer periphery of the first inner side wall to form a third clamping groove with the first inner side wall; One end of the combustion-supporting gas flow meter is convexly provided with at least one second inner side wall and at least one second outer side wall, and the second outer side wall is arranged at an interval on the outer periphery of the second inner side wall to form a fourth clamping groove with the second inner side wall; The second inner side wall is clamped in the third clamping slot with an interference fit, and the first outer side wall is clamped in the fourth clamping slot with an interference fit, or the second outer side wall is clamped in the third clamping slot with an interference fit, and the first inner side wall is clamped in the fourth clamping slot with an interference fit; The gas calorific value meter is inserted into the mixer from the side wall of the second input end through a Pitot tube, or the gas calorific value meter is inserted into the mixer from the side wall of the output end through a Pitot tube; The wall-mounted boiler combustion control assembly also includes a full premixing fan, and the full premixing fan is arranged in the mixer; The wall-mounted boiler combustion control component further comprises a wall-mounted boiler controller as claimed in claim 10, wherein the wall-mounted boiler controller is connected to the gas valve and the gas calorific value meter by signal; The gas pipeline comprises 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.

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