Wall-hanging stove combustion control assembly

Abstract

The utility model discloses a combustion control assembly of a wall-hanging stove, which relates to the technical field of combustion control of wall-hanging stoves and comprises a combustion chamber, a mixer, a gas valve and a gas calorific value instrument, the mixer is provided with a first input end, a second input end and an output end, the first input end is connected with a combustion-supporting gas pipeline, and the second input end is connected with a gas pipeline. The output end is connected with the combustion chamber; the gas valve is arranged on the gas pipeline; the gas calorific value instrument is connected with the second input end or the output end, and obtains gas calorific value components before the gas and the combustion-supporting gas are mixed or calorific value components of mixed gas formed after the gas and the combustion-supporting gas are mixed in real time; therefore, the calorific value components are obtained through real-time measurement by arranging the gas calorific value instrument, then rapid and accurate self-adaptive adjustment of the air-fuel ratio is achieved, the gas flow / gas volume and / or the combustion-supporting gas flow / combustion-supporting gas volume are adjusted / determined in real time, the influence of gas component difference on the heat efficiency can be well adapted, and it is ensured that the wall-hanging stove is in the optimal combustion condition in real time.

Description

TECHNICAL FIELD

[0001] The utility model relates to wall -hanging stove combustion control technical field, concretely relates to a wall -hanging stove combustion control assembly. BACKGROUND

[0002] The wall-hanging stove combustion control assembly on the market in the past, the gas and air ratio is basically determined after research and development test under standard experimental environment, and the air-fuel ratio under different heat loads is a fixed value, which can realize efficient combustion. Due to the differences in production process, installation scene and different pipeline gas, the actual air-fuel ratio will change greatly, deviating from the optimal air-fuel ratio combustion, ultimately affecting the thermal efficiency and pollution emission performance of the wall-hanging stove, so it is generally necessary to adjust and correct the gas and air ratio again in the production line comprehensive detection process and user installation, which has higher technical requirements for production and installation personnel. Moreover, even after two air-fuel ratio combustion adjustments, the final result is only to ensure the combustion performance of the wall-hanging stove during user installation, and when the wind and rain outside the exhaust pipe and the pipeline gas pressure or even the composition change, the gas and air ratio will still change, which cannot completely achieve the expected energy-saving and emission-reducing effect.

[0003] At present, with the progress of science and technology, there are more and more full-premixed wall-hanging stoves with combustion self-adaptive adjustment function. For this kind of full-premixed wall-hanging stove, the market is mostly based on the ion current of the combustion flame to judge and automatically adjust the size of the gas and air ratio, and theoretically, there is no need to adjust the air-fuel ratio during production and installation. However, the relationship between ion current and air-fuel ratio is only a trend of change, which is obtained by researchers after testing a large amount of data. There is some deviation between the relationship obtained after fitting and the specific corresponding relationship in actual use, and the representation is not good.

[0004] In addition, according to patent No. CN211261241U, the ion current is detected as the main basis for adjusting the fan and the gas valve. This control algorithm will be affected by factors such as ion current, combustion condition, gas source, external environment humidity, ion current detection accuracy, etc., resulting in relatively large errors, and the use time of the machine may also cause errors.

[0005] In addition, according to patent No. CN112524810B, the ion detection current is used to determine the air-fuel ratio, and the oxygen content in the exhaust is detected to further determine the air-fuel ratio of combustion. This method still has problems such as ion current aging and damage or inaccurate detection of oxygen sensors due to excessive water vapor content. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide a wall-hanging stove combustion control assembly, which aims to solve the above problems.

[0007] To achieve the above objectives, the present invention provides a wall-mounted boiler combustion control assembly, comprising:

[0008] combustion chamber;

[0009] 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;

[0010] a gas valve, provided on the gas pipeline; and

[0011] The gas calorific value meter is connected to the second input end of the mixer or 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.

[0012] 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, that is, the air-fuel ratio when the gas can be fully burned, is calculated based on the real-time calorific value component. The gas flow / gas volume and / or the supporting gas flow / supporting gas volume are then adjusted / determined in real time based on this. In this way, efficient, energy-saving, and low-pollution gas combustion is achieved, ensuring that the wall-mounted boiler is in the best combustion condition in real time, well adapting to the impact of gas composition differences on thermal efficiency, and adapting to the impact of gas composition 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, the data obtained is more accurate and can better guarantee the accuracy of the data after long-term operation. 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

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0014] Figure 1 This is a flow chart of an embodiment of the combustion control method for a wall-mounted boiler provided by the present invention;

[0015] Figure 2 This is a flow chart of another embodiment of the wall-mounted boiler combustion control method provided by the present invention;

[0016] Figure 3for Figure 2 Schematic diagram of the process of step S1;

[0017] Figure 4 This is a structural diagram of the combustion control assembly of the wall-mounted boiler provided by the utility model;

[0018] Figure 5 for Figure 4 Schematic diagram of part of the structure of the combustion control assembly of the wall-mounted boiler;

[0019] Figure 6 for Figure 5 Exploded diagram;

[0020] Figure 7 for Figure 5 sectional view of

[0021] Figure 8 for Figure 4 A cross-sectional view of a portion of the structure of the combustion control assembly of a medium-sized wall-mounted boiler;

[0022] Figure 9 for Figure 4 Exploded view of part of the structure of the combustion control assembly of the medium-sized wall-mounted boiler;

[0023] Figure 10 for Figure 4 A cross-sectional view of part of the combustion control assembly of a mid-wall-mounted boiler.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Wall-mounted boiler combustion control components 31 Pitot tube 1 mixer 4 Fuel gas flow meter 11 First input 41 Second inner wall 111 First inner wall 42 Second outer side wall 112 First outer wall 5 Gas flow meter 12 Second input terminal 51 boss 121 First card slot 6 U-shaped latch 122 Second card slot 7 Full premixed fan 2 Gas valve 8 sealing ring 3 Gas calorific value meter

[0026] 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

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] 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 for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 this field to implement. When the combination of technical solutions is mutually 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.

[0030] In the past, the combustion control components for wall-mounted boilers on the market were generally developed and tested under standard experimental environments to determine the gas-to-air ratio. The air-fuel ratio under different heat loads was a fixed value, enabling efficient combustion. Due to differences in the production process, installation scenarios, and the gas in different pipelines, the actual air-fuel ratio can vary significantly, deviating from the optimal air-fuel ratio combustion, ultimately affecting 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 on the production line and during user installation. This places high technical requirements on production and installation personnel. Moreover, even after two air-fuel ratio combustion debuggings, the combustion performance of the wall-mounted boiler is ultimately guaranteed only at the time of user installation. When the wind and rain outside the exhaust pipe, the pipeline gas pressure, or even the composition changes, the gas-to-air ratio will still change, and the expected energy conservation and emission reduction effects cannot be fully achieved.

[0031] 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 ion current and air-fuel ratio is itself only a trend of change, which is a relationship obtained 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.

[0032] In view of this, the utility model provides a combustion control method for a wall-mounted boiler. Figures 1 to 3 This is a flow chart of the wall-mounted boiler combustion control method provided by the utility model.

[0033] See also Figure 1 and Figure 5 The wall-mounted boiler combustion control method comprises the following steps:

[0034] Step S3: obtaining 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, to obtain the real-time calorific value composition.

[0035] 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 the supporting gas pipeline, the second input end of the mixer is connected to the 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 supporting 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 supporting gas are mixed in real time.

[0036] Step S6: Calculate the efficient air-fuel ratio based on the real-time calorific value components.

[0037] Step S7: 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.

[0038] 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 based on the real-time calorific value component, that is, the air-fuel ratio when the gas can fully burn, the gas flow / gas volume and / or the supporting gas flow / supporting 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 condition in real time, well adapting to the impact of gas composition differences on thermal efficiency, and adapting to the impact of gas composition 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, the data obtained is more accurate and can better guarantee the accuracy of the data after long-term operation. 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.

[0039] It should be noted that the calorific value components are the concentrations of various components of the combustible matter in the fuel gas, and the calorific value can be calculated based on the concentrations of various components.

[0040] It should also be noted that, in the present invention, the "real-time adjustment / determination of gas flow / gas volume, and / or supporting gas flow / supporting gas volume" can be understood as: the supporting gas flow / supporting gas volume can remain unchanged, and the ratio of gas to 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 supporting gas in the mixed gas is only adjusted by real-time adjustment / determination of the supporting gas flow / supporting gas volume; of course, the gas flow / gas volume and the supporting gas flow / supporting gas volume can also be adjusted / determined in real time at the same time to achieve the adjustment of the ratio of gas to supporting gas in the mixed gas.

[0041] In addition, in the adjustment / determination, “adjustment” can be understood as making corrections based on the original flow rate / volume, and “determination” can be understood as directly obtaining the flow rate / volume data output.

[0042] Furthermore, the flow rate is the volume of the gas / combustion-supporting gas flowing in per unit time, and the volume is the size of the space of the gas / combustion-supporting gas in the pipeline.

[0043] Further, see Figure 2 , before step S6, the method further includes:

[0044] Step S4: Obtain the gas flow / gas volume in real time to obtain the real-time gas flow / real-time gas volume.

[0045] In this step, the gas flow rate / gas volume can be directly measured in real time using a gas flow meter installed in the gas pipeline. Alternatively, the gas flow rate / gas volume can be measured in real time using a supporting gas flow meter and a mixed gas flow meter. The difference between the data measured by the mixer flow meter and the supporting gas flow meter is the gas flow rate / gas volume. The supporting gas flow meter is installed in the supporting gas pipeline, and the mixer flow meter is installed at the output end of the mixer. Furthermore, due to the suitable operating environment and mature technology of the flow meters, the data accuracy can be guaranteed after long-term operation.

[0046] The step S6 specifically includes:

[0047] 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.

[0048] 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 supporting gas flow rate / supporting gas volume, thereby improving the combustion efficiency of the gas.

[0049] Further, see Figure 2 , before step S6, the method further includes:

[0050] Step S5: Obtain 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.

[0051] In this step, the supporting gas flow rate / volume can be directly measured using a supporting gas flow meter located in the supporting gas pipeline. Alternatively, the supporting gas flow rate / volume can be acquired in real time using a gas flow meter and a mixed gas flow meter. The difference between the data measured by the mixer flow meter and the data measured by the gas flow meter is the supporting gas flow rate / volume. The gas flow meter is located in the gas pipeline, and the mixer flow meter is located at the mixer output. Furthermore, due to the suitable operating environment and mature technology of the flow meter, the data accuracy can be guaranteed after long-term operation.

[0052] The step S7 specifically includes:

[0053] Step S71: Calculate the real-time air-fuel ratio based on the real-time gas flow / real-time gas volume and the real-time oxidant gas flow / real-time oxidant gas volume.

[0054] 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.

[0055] Step S72: 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 premixed fan to increase the gas flow / gas volume and / or reduce the oxidant gas flow / oxidant 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 premixed fan to reduce the gas flow / gas volume and / or increase the oxidant gas flow / oxidant gas volume.

[0056] 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.

[0057] 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.

[0058] 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 premixed 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.

[0059] More specifically, the gas valve is provided on the gas pipeline, and the full premix blower is provided on the mixer.

[0060] 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 calculated quickly and accurately to achieve rapid constant temperature.

[0061] It should be noted that, in the present invention, the order of steps S3, S4, and S5 described above is not limited. Steps S3, S4, and S5 can be performed in any order, or they can be performed simultaneously.

[0062] Specifically, in the present invention, the combustion-supporting gas may be pure oxygen or air mixed with oxygen.

[0063] Further, see Figure 2 , before step S6, the method further includes:

[0064] Step S1: confirm the actual oxygen content in the air.

[0065] 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.

[0066] 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 gauge (the pressure data measured is combined with the regional altitude to calculate the oxygen content), etc.

[0067] Specifically, in one embodiment of the present invention, please refer to Figure 3 , the step S1 specifically includes:

[0068] 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.

[0069] More specifically, in one embodiment of the present invention, step S11 specifically includes:

[0070] 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 ;

[0071] 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;

[0072] Step S113: Maintain gas flow / gas volume Q gas Unchanged, 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, stop air ;

[0073] Step S114: Compare the second thermal output power P' 输出 and the third thermal output power P" 输出 , get the maximum thermal output power P 输出max .

[0074] 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.

[0075] It should be noted that, in an embodiment of the present invention, the preset oxygen content is 20.9%.

[0076] The step S6 specifically includes:

[0077] 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.

[0078] 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.

[0079] For details, please refer to Figure 2 In another embodiment of the present invention, before step S3, the following steps are further included:

[0080] Step S2: Setting the initial air-fuel ratio.

[0081] The step S7 specifically includes:

[0082] Step S71 ′: correct the initial air-fuel ratio in real time according to the efficient air-fuel ratio to obtain a real-time air-fuel ratio.

[0083] Step S72': adjusting the gas flow / gas volume and / or the supporting gas flow / supporting gas volume in real time according to the real-time air-fuel ratio.

[0084] In this way, when calculation is delayed due to factors such as hardware components, the data before correction, ie, the initial air-fuel ratio, can be continued to be used.

[0085] It should be noted that the step S72' may specifically include:

[0086] judge Is it greater than a first preset value, wherein α is the real-time air-fuel ratio, and α0 is the efficient air-fuel ratio;

[0087] 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 supporting gas flow / supporting gas volume. If no, repeat the previous step.

[0088] In this way, frequent adjustment of the gas flow / gas volume and the oxidant gas flow / oxidant gas volume can be avoided, and frequent adjustment of the gas valve and the full premix blower, which affects the service life, can be avoided.

[0089] Furthermore, the step S2 specifically includes:

[0090] Step S21, obtaining unit heat value component according to gas flow per unit time and gas heat value component / mixed gas heat value component, or obtaining unit heat value component according to gas unit volume and gas heat value component / mixed gas heat value component.

[0091] Step S22, adjusting the ratio of combustion-supporting gas flow per unit time / combustion-supporting gas unit volume to the unit heat value component, and monitoring wall-hanging stove output power corresponding to each ratio in real time to obtain optimal wall-hanging stove output power.

[0092] Step S23, directly setting the initial air-fuel ratio according to the combustion-supporting gas flow per unit time / combustion-supporting gas unit volume required by the ratio corresponding to the optimal wall-hanging stove output power, or replacing the original initial air-fuel ratio to obtain a new initial air-fuel ratio.

[0093] In this way, the actual oxygen content and the initial air-fuel ratio are obtained accurately, and the accuracy of adaptive adjustment of the wall-hanging stove is ensured to be not affected by oxygen content of geographical environment.

[0094] Further, for the convenience of understanding the utility model, in one case, the step S22 specifically comprises:

[0095] Step S221, monitoring wall-hanging stove output power corresponding to the unit heat value component in the step S11 to obtain a first output power P1.

[0096] Step S222, keeping gas flow per unit time / gas unit volume unchanged, gradually increasing combustion-supporting gas flow per unit time / combustion-supporting gas unit volume, and monitoring wall-hanging stove output power in real time to obtain a second output power P2, and stopping increasing combustion-supporting gas flow per unit time / combustion-supporting gas unit volume when the second output power P2 is less than or equal to the first output power P1 (the specific adjustment process is shown in Table 1 below).

[0097] Step S223, keeping gas flow per unit time / gas unit volume unchanged, gradually decreasing combustion-supporting gas flow per unit time / combustion-supporting gas unit volume, and monitoring wall-hanging stove output power in real time to obtain a third output power P3, and stopping decreasing combustion-supporting gas flow per unit time / combustion-supporting gas unit volume when the third output power P3 is less than or equal to the first output power P1 (the specific adjustment process is shown in Table 1 below).

[0098] Step S224, comparing the second output power P2 and the third output power P3 to obtain the optimal output power.

[0099] In this way, the most efficient combustion and heat exchange working condition point under the gas flow per unit time / gas unit volume can be determined, and the corresponding parameters at the working condition point can be used to calculate the actual oxygen content and the initial air-fuel ratio.

[0100] Table 1

[0101]

[0102] In another embodiment of the present invention, step S22 specifically includes:

[0103] 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;

[0104] Step S222′: maintaining the gas flow rate / gas unit volume per unit time constant, gradually increasing the supporting gas flow rate / supporting gas unit volume per unit time, and monitoring the boiler output power in real time to obtain a second output power; and when the second output power no longer increases with the increase in the supporting gas flow rate / supporting gas unit volume per unit time, stopping increasing the supporting gas flow rate / supporting gas unit volume per unit time;

[0105] Step S223': maintaining the gas flow rate / gas unit volume per unit time unchanged, gradually reducing the supporting gas flow rate / supporting gas unit volume per unit time, and monitoring the boiler output power in real time to obtain a third output power; and when the third output power no longer increases with the reduction of the supporting gas flow rate / supporting gas unit volume per unit time, stopping reducing the supporting gas flow rate / supporting gas unit volume per unit time;

[0106] Step S224: Compare the second output power and the third output power to obtain the optimal output power.

[0107] Furthermore, the calculation formula for the output power of the wall-mounted boiler is:

[0108] P 输出 =C×ρ×Q W ×(T2-T1);

[0109] Where, P 输出 Output power for the wall-mounted boiler;

[0110] C is the specific heat capacity of water;

[0111] ρ is the density of water;

[0112] Q W is water flow / water volume;

[0113] T2 is the outlet water temperature;

[0114] T1 is the return water temperature.

[0115] 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.

[0116] Specifically, based on the above-mentioned embodiment of "the combustion-supporting gas is air" and "before step S3, the step further includes: step S2, setting an initial air-fuel ratio", step S2 specifically includes:

[0117] Set the initial air-fuel ratio based on the actual oxygen content in the air.

[0118] 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.

[0119] The utility model also provides a wall-mounted boiler controller, which is used for communicating with external equipment, storing instructions, and executing the above-mentioned wall-mounted boiler combustion control method.

[0120] The utility model also provides a wall-mounted boiler combustion control assembly 100, please refer to 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 the supporting gas pipeline, the second input end 12 is connected to the 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 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.

[0121] 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 supporting gas are mixed, or the calorific value composition of the mixed gas formed after the gas and the 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 supporting gas flow rate / supporting gas volume can be adjusted / determined in real time. It 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 utility model is more accurate, and can better guarantee the accuracy of the data after long-term operation.

[0122] 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.

[0123] Furthermore, the wall-mounted boiler combustion control assembly 100 further includes a combustion-supporting gas flow meter 54 . The combustion-supporting gas flow meter 54 is provided on the combustion-supporting gas pipeline and is used to measure the combustion-supporting gas flow rate / combustion-supporting gas volume.

[0124] Specifically, the wall-mounted boiler combustion control assembly 100 further includes a gas flow meter 5 , which is provided in the gas pipeline and is used to measure the gas flow rate / gas volume.

[0125] 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 on the combustion-supporting gas pipeline, and the gas flow meter 5 is arranged on the gas pipeline.

[0126] Further, 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 .

[0127] For details, please refer to Figures 5 to 7 In 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 presses the boss 51 into the first slot 121.

[0128] 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.

[0129] Further, 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 .

[0130] For details, please refer to Figure 9 and Figure 10 In one embodiment of the present invention, the first input end 11 of the mixer 1 is protrudingly 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 protrudingly 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 clamped in the third slot and has an interference fit, and the first outer side wall 112 is clamped in the fourth slot and has an interference fit, or the second outer side wall 42 is clamped in the third slot and has an interference fit, and the first inner side wall 111 is clamped in the fourth slot and has an interference fit. In this way, the supporting gas flow meter 54 is tightly installed, and because the supporting gas flow meter 54 is lightweight, its installation is more stable and reliable.

[0131] For details, please refer to Figure 8 In 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 gas calorific value components before the gas and the supporting gas are mixed in real time.

[0132] 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.

[0133] At the same time, the gas calorific value meter 3 adopts the principle of the Pitot tube 31, with the total pressure at the gas inlet and the static pressure at the gas outlet. 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. Its external dimensions and the installation of core components can remain unchanged, facilitating the iterative application of new technologies and structures.

[0134] For details, please refer to Figure 4 The wall-mounted boiler combustion control assembly 100 also includes a full premixing fan 7, which is provided in the mixer 1 and is used to charge the mixer 1 with combustion-supporting gas and adjust the air-fuel ratio.

[0135] Specifically, the boiler combustion control assembly 100 further includes a boiler controller, which is signal-connected to the gas valve 2 and the gas calorific value meter 3. More specifically, the boiler controller and the gas valve 2 and the gas calorific value meter 3 can be wired or wirelessly connected. Furthermore, the boiler controller is signal-connected to the auxiliary gas flow meter 54, the gas flow meter 5, and the full premix fan 7.

[0136] Furthermore, the gas pipeline includes a first section of pipeline connected to the upstream end of the gas valve 2, and a second section of pipeline connected to the downstream end of the gas valve 2. The gas calorific value meter 3 is arranged in the second section of pipeline or the mixer, 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.

[0137] 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 working condition and abnormal working 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 working 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.

[0138] 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 use auxiliary gas / air to replace the gas in the gas calorific value meter 3; 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.

[0139] In addition, based on the above-mentioned embodiment of the wall-hanging stove combustion control assembly 100 further comprising a wall-hanging stove controller, which is in signal connection with the gas valve 2 and the gas calorific value instrument 3, the wall-hanging stove combustion control assembly 100 further comprises a control switch, which is in signal connection with the wall-hanging stove controller, for delivering a control signal to the wall-hanging stove controller, so that the wall-hanging stove controller receives the control signal to control the working state of the gas valve 2 and to control the combustion-supporting gas / air to replace the gas in the gas calorific value instrument 3; in this way, the wall-hanging stove controller can periodically calibrate the gas calorific value instrument 3 according to the actual use condition.

[0140] The above-mentioned is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, which is made by using the present application specification and the attached drawings, under the utility model concept of the present application, is included in the patent protection range of the present application.

Claims

1. A wall-mounted boiler combustion control assembly, characterized in that: The wall-mounted boiler combustion control assembly includes: 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, provided on the gas pipeline; and The gas calorific value meter is connected to the second input end of the mixer or 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.

2. The wall-mounted boiler combustion control assembly according to claim 1, characterized in that: The wall-mounted boiler combustion control assembly further includes a combustion-supporting gas flow meter, which is arranged on the combustion-supporting gas pipeline; and / or, The wall-mounted boiler combustion control assembly further includes a gas flow meter, which is arranged on the gas pipeline.

3. The combustion control assembly of the wall-mounted boiler according to claim 2, characterized in that: The combustion control assembly of the wall-mounted boiler further includes 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 auxiliary gas flow meter, and the second input end is connected to the gas flow meter.

4. The combustion control assembly for a wall-mounted boiler according to any one of claims 1 to 3, 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 inward and outward 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 the boss is adapted to be clamped in the first clamping 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 presses the boss into the first slot.

5. The wall-mounted boiler combustion control assembly according to any one of claims 1 to 3, characterized in that: 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, wherein the first outer side wall is spaced apart from the outer periphery of the first inner side wall to form a third slot with the first inner side wall; One end of the oxidant 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 spaced apart and arranged on the outer periphery of the second inner side wall to form a fourth slot with the second inner side wall; The second inner side wall is clamped in the third clamping slot and has an interference fit, and the first outer side wall is clamped in the fourth clamping slot and has an interference fit, or the second outer side wall is clamped in the third clamping slot and has an interference fit, and the first inner side wall is clamped in the fourth clamping slot and has an interference fit.

6. The combustion control assembly for a wall-mounted boiler according to any one of claims 1 to 3, characterized in that: 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.

7. The combustion control assembly for a wall-mounted boiler according to any one of claims 1 to 3, characterized in that: The wall-mounted boiler combustion control assembly further includes a full premixing fan, which is arranged in the mixer.

8. The combustion control assembly for a wall-mounted boiler according to any one of claims 1 to 3, characterized in that: The wall-mounted boiler combustion control component further includes a wall-mounted boiler controller, which is connected to the gas valve and the gas calorific value meter by signal.

9. The combustion control assembly for a wall-mounted boiler according to any one of claims 1 to 3, characterized in that: The gas pipeline includes a first section of pipeline connected to the upstream end of the gas valve and a second section of pipeline connected to the downstream end of the gas valve. The gas calorific value meter is provided in the second section of pipeline or the mixer.

10. The wall-mounted boiler combustion control assembly according to claim 9, characterized in that: The wall-mounted boiler combustion control assembly further includes a manual switch, which is connected to the gas valve to control the working state of the gas valve and replace the gas in the gas calorific value meter with auxiliary gas / air; or, The wall-mounted boiler combustion control component also includes a control switch and a wall-mounted boiler controller. The wall-mounted boiler controller is connected to the gas valve and the gas calorific value meter by signal. The control switch is connected to the wall-mounted boiler controller by signal and is used to transmit 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 and control the auxiliary gas / air to replace the gas in the gas calorific value meter.

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