Adaptive control method and system for wall-mounted gas boiler

Abstract

The present invention relates to the field of wall-mounted gas boilers. Disclosed are an adaptive control method and system for a wall-mounted gas boiler. The method comprises: operating a wall-mounted gas boiler, and acquiring, by means of a gas calorimeter, a calorific value component of a fuel gas before the fuel gas is mixed with a combustion-supporting gas, or a calorific value component of a mixed gas formed after the fuel gas is mixed with the combustion-supporting gas, so as to obtain a real-time calorific value component; and calculating a high-efficiency air-fuel ratio at least on the basis of the real-time calorific value component, and regulating / determining in real time a fuel gas flow / fuel gas volume and / or a combustion-supporting gas flow / combustion-supporting gas volume. The method further comprises a gas calorimeter zeroing method: closing a fuel gas valve, and replacing the fuel gas in the gas calorimeter with the combustion-supporting gas / air, so as to zero the gas calorimeter by means of the combustion-supporting gas / air. In this way, fuel gas combustion is efficient, energy-saving and low-pollution, it is ensued that the wall-mounted gas boiler is in an optimal combustion condition in real time, and the measurement accuracy of the gas calorimeter is ensured.

Description

Adaptive Control Method and System for Gas-Fired Wall-Mounted Boilers Technical Field

[0001] This invention relates to the field of gas-fired wall-hung boiler technology, specifically to an adaptive control method and system for gas-fired wall-hung boilers. Background Technology

[0002] Previously, gas-fired wall-hung boilers on the market were developed and tested under standard experimental conditions, with the gas-to-air ratio determined to be a fixed value under different heat loads, achieving efficient combustion. However, due to differences in the production process, installation scenarios, and gas supply lines, the actual air-to-air ratio can vary significantly, deviating from the optimal ratio for combustion. This ultimately affects the boiler's thermal efficiency and emissions performance. Therefore, the gas-to-air ratio typically needs to be adjusted and corrected again during the comprehensive testing process on the production line and during user installation. This places high demands on the technical skills of production and installation personnel. Moreover, even after two rounds of air-to-air ratio combustion adjustments, the final result only guarantees the boiler's combustion performance at the time of installation. When the wind, rain, gas pressure, or even gas composition outside the exhaust pipe changes, the gas-to-air ratio will still change, failing to fully achieve the expected energy-saving and emission-reduction effects.

[0003] Currently, with technological advancements, more and more fully premixed wall-hung boilers with adaptive combustion control are emerging. For this type of fully premixed wall-hung boiler, most on the market determine and automatically adjust the ratio of gas to air based on the ion current of the combustion flame. For example, the adaptive control methods and systems for wall-hung boilers disclosed in patent documents such as "CN117722772A" and "CN112524810A" use ion sensing needles to detect the magnitude and trend of the flame ion current and adjust the ratio of gas to air in the burner of the wall-hung boiler.

[0004] However, firstly, the relationship between ion current and air-fuel ratio is merely a trend, a relationship obtained by researchers after fitting a large amount of data. This fitted relationship may deviate slightly from the actual correspondence in use, making it unrepresentative. Secondly, the ion sensing needle will undergo a certain degree of oxidation after working at high temperatures for a long time, and some combustion products will also adhere to the surface of the burner of the wall-hung boiler. These factors will affect the accuracy of the ion sensing needle in detecting the flame ion current. Furthermore, the determination of ion current can be affected by factors such as the measurement environment and measurement method, resulting in insufficiently accurate air-fuel ratio data in the wall-hung boiler, making it impossible for the boiler to maintain a high combustion efficiency.

[0005] In addition, some fully premixed wall-hung boilers use oxygen or carbon dioxide sensors in the flue gas to determine the air-fuel ratio, but these sensors have a short effective lifespan and are not currently being stably applied to wall-hung boiler products. Summary of the Invention

[0006] The main objective of this invention is to propose an adaptive control method and system for gas-fired wall-hung boilers, aiming to solve the aforementioned problems.

[0007] To achieve the above objectives, the present invention proposes an adaptive control method for a gas-fired wall-hung boiler, comprising the following steps:

[0008] Step S1: Run the gas wall-hung boiler and obtain the calorific value composition of the gas before mixing the gas and auxiliary gas, or the calorific value composition of the mixture formed after mixing the gas and auxiliary gas, through the gas calorific value meter to obtain the real-time calorific value composition.

[0009] Step S2: Calculate the high efficiency air-fuel ratio based at least on the real-time calorific value composition, and adjust / determine the gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume in real time based on the high efficiency air-fuel ratio;

[0010] The adaptive control method for gas-fired wall-hung boilers also includes a method for zeroing a gas calorific value meter, which comprises the following steps:

[0011] Step S2': Close the gas valve and replace the gas in the gas calorimeter with auxiliary gas / air to zero the gas calorimeter using the auxiliary gas / air. The gas wall-hung boiler further includes a mixer, the gas valve, and a combustion chamber. The mixer has a first input end, a second input end, and an output end. The first input end is connected to an auxiliary gas pipeline, the second input end is connected to a gas pipeline, and the output end is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber. 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 calorimeter is located in the second section of pipeline or the mixing pipeline.

[0012] The present invention also provides an adaptive control system for a gas-fired wall-hung boiler, comprising:

[0013] Combustion chamber;

[0014] A mixer has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to a combustion-supporting gas pipeline, the second input terminal is connected to a gas pipeline, and the output terminal is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section and a second section.

[0015] A gas valve is installed in the gas pipeline, with its upstream end connected to the first section of the pipeline and its downstream end connected to the second section of the pipeline. The gas valve is used to regulate the gas flow rate / gas volume.

[0016] A gas calorific value meter, installed in the second section of the pipeline or the mixing pipeline, is used to detect the calorific value composition of the gas in real time; and,

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

[0018] In the technical solution of this invention, the real-time calorific value composition directly affects the amount of gas flow / volume participating in complete combustion. The real-time calorific value composition is obtained through a gas calorific value meter, and the high-efficiency air-fuel ratio (Air-Fuel Ratio), i.e., the air-fuel ratio at which the gas can burn completely, is calculated based on this composition. The gas flow / volume and / or auxiliary gas flow / volume are then adjusted / determined in real time. This allows for effective adaptation to the impact of gas composition differences on thermal efficiency, achieving high-efficiency, energy-saving, and low-pollution gas combustion. It ensures the wall-hung boiler is in optimal combustion condition in real time and can adapt to the gas composition impact brought about by the future trend of hydrogen blending into natural gas. Compared to conventional methods that determine and adjust the air-fuel ratio based on the ion current of the combustion flame, oxygen sensors, or carbon dioxide sensors, the obtained data is more accurate and better guarantees data accuracy after long-term operation. Simultaneously, it enables rapid and accurate adaptive adjustment of the air-fuel ratio of the wall-hung boiler, eliminating the need for professional personnel to perform combustion air-fuel ratio adjustments during production and installation. In addition, the adaptive control method for gas-fired wall-hung boilers provided by the present invention also includes a method for zeroing a gas calorimeter. This method involves replacing the gas inside the gas calorimeter with auxiliary gas to zero the gas calorimeter, thereby calibrating the gas calorimeter under standard and abnormal operating conditions. This determines the data of the gas calorimeter under normal and abnormal conditions, facilitating adaptive adjustments when the gas calorimeter is in an abnormal operating state, ensuring the measurement accuracy of the gas calorimeter, and thus ensuring the accuracy of the air-fuel ratio judgment and adjustment of the gas-fired wall-hung boiler. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 is a flowchart of the adaptive control method for gas wall-hung boilers provided by the present invention.

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

[0022] Explanation of icon numbers:

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] Currently, with technological advancements, more and more fully premixed wall-hung boilers with adaptive combustion control are emerging. For this type of fully premixed wall-hung boiler, most on the market determine and automatically adjust the ratio of gas to air based on the ion current of the combustion flame. For example, the adaptive control methods and systems for wall-hung boilers disclosed in patent documents such as "CN117722772A" and "CN112524810A" use ion sensing needles to detect the magnitude and trend of the flame ion current and adjust the ratio of gas to air in the burner of the wall-hung boiler.

[0028] However, firstly, the relationship between ion current and air-fuel ratio is merely a trend, a relationship obtained by researchers after fitting a large amount of data. This fitted relationship may deviate slightly from the actual correspondence in use, making it unrepresentative. Secondly, the ion sensing needle will undergo a certain degree of oxidation after working at high temperatures for a long time, and some combustion products will also adhere to the surface of the burner of the wall-hung boiler. These factors will affect the accuracy of the ion sensing needle in detecting the flame ion current. Furthermore, the determination of ion current can be affected by factors such as the measurement environment and measurement method, resulting in insufficiently accurate air-fuel ratio data in the wall-hung boiler, making it impossible for the boiler to maintain a high combustion efficiency.

[0029] In addition, some fully premixed wall-hung boilers use oxygen or carbon dioxide sensors in the flue gas to determine the air-fuel ratio, but these sensors have a short effective lifespan and are not currently being stably applied to wall-hung boiler products.

[0030] In view of this, the present invention provides an adaptive control method for a gas-fired wall-hung boiler. Referring to Figure 1, the adaptive control method for the gas-fired wall-hung boiler includes the following steps:

[0031] Step S1: Run the gas wall-hung boiler and obtain the calorific value composition of the gas before mixing the gas and auxiliary gas, or the calorific value composition of the mixture formed after mixing the gas and auxiliary gas, through the gas calorific value meter to obtain the real-time calorific value composition.

[0032] Step S2: Calculate the high efficiency air-fuel ratio based at least on the real-time calorific value composition, and adjust / determine the gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume in real time based on the high efficiency air-fuel ratio;

[0033] The adaptive control method for gas-fired wall-hung boilers also includes a method for zeroing a gas calorific value meter, which comprises the following steps:

[0034] Step S2': Close the gas valve and replace the gas in the gas calorimeter with auxiliary gas / air to zero the gas calorimeter using the auxiliary gas / air. The gas wall-hung boiler further includes a mixer, the gas valve, and a combustion chamber. The mixer has a first input end, a second input end, and an output end. The first input end is connected to an auxiliary gas pipeline, the second input end is connected to a gas pipeline, and the output end is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber. 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 calorimeter is located in the second section of pipeline or the mixing pipeline.

[0035] In the technical solution of this invention, the real-time calorific value composition directly affects the amount of gas flow / volume participating in complete combustion. The real-time calorific value composition is obtained through a gas calorific value meter, and the high-efficiency air-fuel ratio (Air-Fuel Ratio), i.e., the air-fuel ratio at which the gas can burn completely, is calculated based on this composition. The gas flow / volume and / or auxiliary gas flow / volume are then adjusted / determined in real time. This allows for effective adaptation to the impact of gas composition differences on thermal efficiency, achieving high-efficiency, energy-saving, and low-pollution gas combustion. It ensures the wall-hung boiler is in optimal combustion condition in real time and can adapt to the gas composition impact brought about by the future trend of hydrogen blending into natural gas. Compared to conventional methods that determine and adjust the air-fuel ratio based on the ion current of the combustion flame, oxygen sensors, or carbon dioxide sensors, the obtained data is more accurate and better guarantees the accuracy of data after long-term operation. Simultaneously, it enables rapid and accurate adaptive adjustment of the air-fuel ratio of the wall-hung boiler, eliminating the need for professional personnel to perform combustion air-fuel ratio adjustments during production and installation. In addition, the adaptive control method for gas-fired wall-hung boilers provided by the present invention also includes a method for zeroing a gas calorimeter. This method involves replacing the gas inside the gas calorimeter with auxiliary gas to zero the gas calorimeter, thereby calibrating the gas calorimeter under standard and abnormal operating conditions. This determines the data of the gas calorimeter under normal and abnormal conditions, facilitating adaptive adjustments when the gas calorimeter is in an abnormal operating state, ensuring the measurement accuracy of the gas calorimeter, and thus ensuring the accuracy of the air-fuel ratio judgment and adjustment of the gas-fired wall-hung boiler.

[0036] It should be noted that the calorific value composition refers to the concentration of each component of the combustible material in the gas, and the calorific value can be calculated based on the concentration of each component. Furthermore, when the gas calorific value meter is installed in the second section of the pipeline, it measures the calorific value composition of the gas before the gas and oxidizing agent are mixed; when the gas calorific value meter is installed in the mixing pipeline, it measures the calorific value composition of the mixture formed after the gas and oxidizing agent are mixed.

[0037] It should also be noted that, in this invention, the phrase "real-time adjustment / determination of gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume" can be understood as follows: It can mean that the auxiliary gas flow rate / auxiliary gas volume remains constant, while the ratio of gas and auxiliary gas in the mixture is adjusted solely by real-time adjustment / determination of the gas flow rate / gas volume; it can also mean that the gas flow rate / gas volume remains constant, while the ratio of gas and auxiliary gas in the mixture is adjusted solely by real-time adjustment / determination of the auxiliary gas flow rate / auxiliary gas volume; or it can mean that the gas flow rate / gas volume and the auxiliary gas flow rate / auxiliary gas volume are simultaneously adjusted / determined in real-time to achieve the adjustment of the ratio of gas and auxiliary gas in the mixture.

[0038] Furthermore, in the aforementioned adjustment / determination, "adjustment" can be understood as making corrections based on the original flow / volume, while "determination" can be understood as directly obtaining the flow / volume data output.

[0039] Furthermore, the flow rate is the volume of gas / fuel flowing in per unit time, and the volume is the size of the space within the pipeline for gas / fuel.

[0040] It should also be noted that in this invention, the combustion-supporting gas can be pure oxygen, air, or oxygen-enriched air composed of a mixture of oxygen and air with a content greater than 50%. Furthermore, the phrase "replacing the gas in the gas calorimeter with combustion-supporting gas / air" can be understood as either replacing the gas in the gas calorimeter with combustion-supporting gas or replacing the gas in the gas calorimeter with air; in one embodiment, when the combustion-supporting gas is oxygen-enriched air, it can be replacing the gas in the gas calorimeter with air. Simultaneously, the replacement of the gas in the gas calorimeter with combustion-supporting gas / air can be achieved through self-diffusion or through a mechanism such as a fan.

[0041] Furthermore, referring to Figure 1, the procedure preceding step S2' also includes:

[0042] Step S1': Acquire ion current data in real time, and determine whether the gas calorific value meter needs to be calibrated based on the ion current data and the high efficiency air-fuel ratio calculated at least based on the real-time calorific value composition.

[0043] Thus, by combining the ion current data and the real-time calorific value composition to determine the operating condition of the gas calorific value meter in real time, it is suitable for determining when the gas calorific value meter needs to be calibrated. In this case, the ion current data only plays an auxiliary role in the judgment, so its data accuracy is not required too much.

[0044] Further, step S1' specifically includes:

[0045] Step S11': Acquire the ion current data in real time through the ion current sensor, and calculate the air-fuel ratio α' by using the ion current algorithm model.

[0046] Step S12': Real-time gas flow rate / gas volume and auxiliary gas flow rate / auxiliary gas volume are obtained to obtain real-time gas flow rate / real-time gas volume and real-time auxiliary gas flow rate / real-time auxiliary gas volume. Based on the real-time gas flow rate / real-time gas volume, the real-time auxiliary gas flow rate / real-time auxiliary gas volume, and the real-time gas composition, the real-time air-fuel ratio α is calculated.

[0047] In this step, the gas flow rate / gas volume can be obtained directly by a gas flow meter, or indirectly by a combustion gas flow meter and a mixed gas flow meter, that is, the difference between the measurement data of the mixed gas flow meter and the measurement data of the combustion gas flow meter.

[0048] Similarly, the combustion gas flow rate / volume can be obtained directly by the combustion gas flow meter, or indirectly by the gas flow meter and the mixed gas flow meter, that is, the difference between the measurement data of the mixed gas flow meter and the measurement data of the gas flow meter.

[0049] Step S13': Compare the real-time air-fuel ratio α with the calculated air-fuel ratio α' to determine whether the gas calorific value meter needs to be calibrated.

[0050] In this step, the operating condition of the gas calorific value meter is determined by combining the ion current data measured by the ion current sensor and the air-fuel ratio difference, thereby improving accuracy.

[0051] Furthermore, step S13' specifically includes:

[0052] Step S131', Judgment Is it greater than the first preset threshold?

[0053] If yes, then calibrate the gas calorific value meter; otherwise, repeat steps S11'-S12'.

[0054] In this way, a certain margin can be left for the accuracy of the ion current data during the judgment process.

[0055] It should be noted that in this step, when When the temperature exceeds the first preset threshold and the gas-fired wall-hung boiler is in idle state or heating mode and reaches the preset temperature, the gas calorific value meter is calibrated to avoid affecting normal use by the user.

[0056] Specifically, please refer to Figure 1. After step S1', the following is also included:

[0057] Step S3': Obtain the number of times n that the gas calorific value meter performs real-time calibration within the preset calibration period, and determine whether the number n is less than the second preset threshold.

[0058] If yes, repeat steps S1' and S2' in step S4'; otherwise, confirm that the ion current data is abnormal and correct the ion current data.

[0059] Thus, by identifying abnormalities in the number of calibrations within the preset calibration period, the abnormality of the ion current data is determined, thereby ensuring the accuracy of the ion current data and preventing abnormal calibration of the gas calorific value meter.

[0060] Furthermore, in one embodiment of the present invention, the second preset threshold is set to 3, that is, when n≥3, the ion current data is confirmed to be abnormal and the ion current data is corrected; when n<3, steps S1' and S2' are repeated to perform normal judgment and calibration of the gas calorific value meter.

[0061] Specifically, step S2' includes:

[0062] According to the preset calibration cycle, the gas valve is closed periodically, and the gas in the gas calorimeter is replaced with auxiliary gas to periodically calibrate the gas calorimeter to zero using the auxiliary gas.

[0063] Thus, by periodically controlling the working state of the gas valve, i.e. controlling the charging of the auxiliary gas, and cooperating with the periodic calibration of the gas calorific value meter, the measurement accuracy of the gas calorific value meter is ensured.

[0064] It should be noted that, in this invention, the gas calorific value meter can be calibrated both periodically and in real time to further ensure the accuracy of the measurement data.

[0065] Furthermore, the preset calibration period is a certain regular time or a certain usage time.

[0066] It should be noted that the "certain normal time" refers to the calculation based on normal time regardless of whether the gas boiler is in use, and this calculation method is simple; while the "certain usage time" is calculated based on the usage time of the gas boiler, that is, the time when the gas boiler is in a non-operating state is subtracted from the normal time, and only the time when the gas boiler is in an operating state is included, which can avoid calibration when the user is using it, thus avoiding affecting the user's use.

[0067] Specifically, the preset calibration cycle is determined by learning user habits. This avoids affecting the user's use of the gas-fired wall-hung boiler and improves the user experience.

[0068] Furthermore, the user's usage habits are learned during the initial stage of using the gas wall-hung boiler. In this way, the learning can be carried out during the period when the calorimeter does not need to be zeroed, i.e., the initial stage of its use, thus avoiding interference between the zeroing process and the learning process.

[0069] Specifically, in one embodiment of the present invention, step S2' specifically includes:

[0070] The gas valve is closed by manual switch or control switch, and the fan is controlled to deliver auxiliary gas into the gas pipeline, so as to calibrate the gas calorific value meter by the auxiliary gas.

[0071] In this step, users can manually zero the gas calorific value meter according to their actual needs, improving practicality and user experience.

[0072] Specifically, in one embodiment of the present invention, step S2' specifically includes:

[0073] The gas valve is closed, and the gas in the gas calorific value meter is replaced by an auxiliary gas / air supply driven by a fan.

[0074] Thus, the fan not only regulates the flow / volume of the auxiliary combustion gas but also assists in zeroing, thereby simplifying the structure of the gas-fired wall-hung boiler and reducing costs. Furthermore, in this step, the fan can first extract the gas from the gas calorimeter and then fill it with auxiliary combustion gas / air; alternatively, the fan can fill the gas calorimeter with auxiliary combustion gas / air only after the gas has freely diffused outwards.

[0075] This invention also provides an adaptive control system 100 for a gas-fired wall-hung boiler. Referring to Figure 2, the adaptive control system 100 includes a combustion chamber, a mixer 1, a gas valve 2, a gas calorific value meter 3, and a controller. The mixer 1 has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to a gas-supporting pipeline, the second input terminal is connected to a gas pipeline, and the output terminal is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section and a second section. The gas valve 2 is located on the gas pipeline, with its upstream end connected to the first section and its downstream end connected to the second section. The gas valve 2 is used to adjust the gas flow rate / gas volume. The gas calorific value meter 3 is located on the second section or the mixing pipeline and is used to detect the calorific value composition of the gas in real time. The controller is electrically connected to the gas valve 2 and the gas calorific value meter 3, and is used to acquire and process signal data, executing the adaptive control method for the gas-fired wall-hung boiler described above.

[0076] Thus, by setting the gas calorific value meter 3 to measure the calorific value composition of the gas before mixing with the auxiliary gas, or the calorific value composition of the mixture formed after mixing with the auxiliary gas, the air-fuel ratio can be quickly and accurately adaptively adjusted. The gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume can be adjusted / determined in real time. This can well adapt to the impact of gas composition differences on thermal efficiency, and can also adapt to the impact of gas composition brought about by the future trend of natural gas hydrogen blending. This achieves high-efficiency, energy-saving, and low-pollution gas combustion, ensuring that the wall-hung boiler is in the best combustion condition in real time. Moreover, compared with the existing wall-hung boilers that use ion current data measured by ion current sensors to determine and adjust the air-fuel ratio, the wall-hung boiler combustion control component 100 provided by this invention has higher accuracy in measuring and calculating the data, and can better guarantee the accuracy of the data after long-term operation.

[0077] Simultaneously, the gas calorimeter can be zeroed by closing the gas valve and replacing the gas inside the gas calorimeter with auxiliary gas. This allows for calibration of the gas calorimeter under standard and abnormal operating conditions, determining the data of the gas calorimeter under normal and abnormal conditions. This facilitates adaptive adjustments when the gas calorimeter is in an abnormal operating state, ensuring the measurement accuracy of the gas calorimeter and, consequently, the accuracy of the air-fuel ratio judgment and adjustment of the gas wall-hung boiler.

[0078] Furthermore, the adaptive control system 100 for the gas-fired wall-hung boiler also includes a gas-supporting flow meter 4, which is installed in the gas-supporting pipeline, and the controller is electrically connected to the gas-supporting flow meter 4. Thus, by setting the gas-supporting flow meter 4, the gas-supporting flow rate / volume can be collected with high accuracy and low cost.

[0079] Specifically, the adaptive control system 100 for the gas-fired wall-hung boiler also includes a gas flow meter 5, which is installed in the gas pipeline, and the controller is electrically connected to the gas flow meter 5. Thus, by using the gas flow meter 5, the gas flow rate / gas volume can be collected with high accuracy and low cost.

[0080] It should be noted that in this invention, the above two technical features can be set selectively or simultaneously. Specifically, please refer to Figure 2. In one embodiment of this invention, the above two technical features are set simultaneously, that is, the gas-fired wall-hung boiler adaptive control system 100 further includes a gas-supporting flow meter 4 and a gas flow meter 5. The gas-supporting flow meter 4 is located in the gas-supporting pipeline, the gas flow meter 5 is located in the gas pipeline, and the controller is electrically connected to the gas-supporting flow meter 4 and the gas flow meter 5.

[0081] Further, please refer to Figure 2. In one embodiment of the present invention, the mixer 1 is a Venturi premixer, and the first input terminal 11 is connected to the gas flow meter 454, and the second input terminal 12 is connected to the gas flow meter 55.

[0082] Specifically, in one embodiment of the present invention, the gas wall-hung boiler adaptive control system 100 further 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 calorimeter 3 with auxiliary gas / air; thus, the user can manually zero the gas calorimeter according to actual usage needs, improving practicality and user experience.

[0083] In another embodiment of the present invention, the gas wall-hung boiler adaptive control system 100 further includes a control switch, which is electrically connected to the controller and is used to send a control signal to the controller so that the controller receives the control signal to control the working state of the gas valve 2 and to control the replacement of the gas in the gas calorimeter 3 with auxiliary gas / air; thus, the controller can periodically calibrate the gas calorimeter to zero according to actual usage.

[0084] Specifically, referring to Figure 2, the adaptive control system 100 of the gas-fired wall-hung boiler also includes a fan 6, which is located in the mixer 1 and is used to adjust the flow rate / volume of the auxiliary gas. The controller is electrically connected to the fan 6. The fan 6 enables real-time adjustment of the gas flow rate / volume and / or the auxiliary gas flow rate / volume. In addition, it can also be used to replace the gas in the gas calorimeter 3 with auxiliary gas / air, thereby achieving zeroing of the gas calorimeter 3, simplifying the structure of the gas-fired wall-hung boiler, and reducing costs.

[0085] More specifically, in one embodiment of the present invention, the fan 6 is a fully premixed fan.

[0086] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An adaptive control method for a gas-fired wall-hung boiler, characterized in that, The adaptive control method for gas-fired wall-hung boilers includes the following steps: Step S1: Run the gas wall-hung boiler and obtain the calorific value composition of the gas before mixing the gas and auxiliary gas, or the calorific value composition of the mixture formed after mixing the gas and auxiliary gas, through the gas calorific value meter to obtain the real-time calorific value composition. Step S2: Calculate the high efficiency air-fuel ratio based at least on the real-time calorific value composition, and adjust / determine the gas flow rate / gas volume and / or auxiliary gas flow rate / auxiliary gas volume in real time based on the high efficiency air-fuel ratio; The adaptive control method for gas-fired wall-hung boilers also includes a method for zeroing a gas calorific value meter, which comprises the following steps: Step S2': Close the gas valve and replace the gas in the gas calorimeter with auxiliary gas / air to zero the gas calorimeter using the auxiliary gas. The gas wall-hung boiler further includes a mixer, the gas valve, and a combustion chamber. The mixer has a first input end, a second input end, and an output end. The first input end is connected to an auxiliary gas pipeline, the second input end is connected to a gas pipeline, and the output end is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber. 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 calorimeter is located in the second section of pipeline or the mixing pipeline.

2. The adaptive control method for a gas-fired wall-hung boiler as described in claim 1, characterized in that, The procedure preceding step S2' also includes: Step S1': Acquire ion current data in real time, and determine whether the gas calorific value meter needs to be calibrated based on the ion current data and the high efficiency air-fuel ratio calculated at least based on the real-time calorific value composition.

3. The adaptive control method for a gas-fired wall-hung boiler as described in claim 2, characterized in that, The specific steps S1' include: Step S11': Acquire the ion current data in real time through the ion current sensor, and calculate the ion current data through the ion current algorithm model to obtain the calculated air-fuel ratio α'. Step S12': Real-time gas flow rate / gas volume and auxiliary gas flow rate / auxiliary gas volume are obtained to obtain real-time gas flow rate / real-time gas volume and real-time auxiliary gas flow rate / real-time auxiliary gas volume. Based on the real-time gas flow rate / real-time gas volume, the real-time auxiliary gas flow rate / real-time auxiliary gas volume, and the real-time gas composition, the real-time air-fuel ratio α is calculated. Step S13': Compare the real-time air-fuel ratio α with the calculated air-fuel ratio α' to determine whether the gas calorific value meter needs to be calibrated.

4. The adaptive control method for a gas-fired wall-hung boiler as described in claim 3, characterized in that, The specific steps of S13' include: Step S131', Judgment Is it greater than the first preset threshold? If yes, then calibrate the gas calorific value meter; otherwise, repeat steps S11'-S12'.

5. The adaptive control method for a gas-fired wall-hung boiler as described in claim 2, characterized in that, The step S1' is followed by: Step S3': Obtain the number of times n that the gas calorific value meter performs real-time calibration within the preset calibration period, and determine whether the number n is less than the second preset threshold. If yes, repeat steps S1' and S2' in step S4'; otherwise, confirm that the ion current data is abnormal and correct the ion current data.

6. The adaptive control method for a gas-fired wall-hung boiler as described in claim 1, characterized in that, The specific steps S2' include: According to the preset calibration cycle, the gas valve is closed periodically, and the gas in the gas calorific value meter is replaced with auxiliary gas to periodically calibrate the gas calorific value meter to zero using the auxiliary gas. The preset calibration period is a certain regular time or a certain usage time; or the preset calibration period is determined by learning user usage habits.

7. The adaptive control method for a gas-fired wall-hung boiler as described in claim 6, characterized in that, The user's usage habits are learned during the initial stage of using the gas wall-hung boiler.

8. The adaptive control method for a gas-fired wall-hung boiler as described in claim 1, characterized in that, The specific steps S2' include: The gas valve is closed by manual switch or control switch, and the fan is controlled to deliver auxiliary gas into the gas pipeline, so that the auxiliary gas can be used to zero the gas calorific value meter; or The gas valve is closed, and the gas in the gas calorific value meter is replaced by a blower-driven auxiliary gas supply.

9. An adaptive control system for a gas-fired wall-hung boiler, characterized in that, include: Combustion chamber; A mixer has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to a combustion-supporting gas pipeline, the second input terminal is connected to a gas pipeline, and the output terminal is connected to a mixing pipeline. The mixing pipeline is connected to the combustion chamber, and the gas pipeline includes a first section and a second section. A gas valve is installed in the gas pipeline, with its upstream end connected to the first section of the pipeline and its downstream end connected to the second section of the pipeline. The gas valve is used to regulate the gas flow rate / gas volume. A gas calorific value meter is installed in the second section of the pipeline or the mixing pipeline to detect the calorific value composition of the gas in real time. as well as, The controller, electrically connected to the gas valve and the gas calorific value meter, is used to acquire and process signal data and execute the adaptive control method for gas wall-hung boilers as described in any one of claims 1-8.

10. The adaptive control system for a gas-fired wall-hung boiler as described in claim 9, characterized in that, The adaptive control system for the gas-fired wall-hung boiler also includes a gas-supporting flow meter, which is installed in the gas-supporting pipeline, and the controller is electrically connected to the gas-supporting flow meter; and / or The adaptive control system of the gas wall-hung boiler also includes a gas flow meter, which is installed in the gas pipeline, and the controller is electrically connected to the gas flow meter.

11. The adaptive control system for a gas-fired wall-hung boiler as described in claim 10, characterized in that, The adaptive control system of the gas-fired wall-hung boiler also includes a manual switch connected to the gas valve, used to control the operating state of the gas valve and to replace the gas in the gas calorific value meter with auxiliary gas / air; or... The adaptive control system of the gas-fired wall-hung boiler also includes a control switch electrically connected to the controller, used to send a control signal to the controller, so that the controller receives the control signal to control the working state of the gas valve and to control the replacement of the gas in the gas calorific value meter with auxiliary gas / air; or... The adaptive control system of the gas wall-hung boiler also includes a fan, which is located in the mixer and is used to adjust the flow rate / volume of the auxiliary gas; The controller is electrically connected to the wind turbine.

Images