Boiler combustion system, boiler combustion control method, control device, and storage medium

Abstract

This invention discloses a boiler combustion system, a boiler combustion control method, a control device, and a storage medium. The boiler combustion system includes a boiler with a burner and a flue for discharging flue gas; a gas delivery module includes a gas main and a gas regulating valve, the gas main being connected to the burner through the gas regulating valve; an air supply module includes a blower for introducing air into the boiler, an induced draft fan for extracting flue gas from the boiler to the flue, a waste heat heater for heating the air using heat from the flue, and a flue gas return processor for filtering and circulating the flue gas; the waste heat heater is located on one side of the flue and is connected to the blower, the flue gas return processor, and the boiler, respectively, and the flue gas return processor is connected to the flue and the induced draft fan, respectively; a combustion detection module includes a pipe detection component for detecting the gas flow rate in the gas main, a pressure detection component for detecting the furnace pressure of the boiler, and a temperature detection component for detecting the combustion temperature of the boiler.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a boiler combustion system, a boiler combustion control method, a control device, and a storage medium. Background Technology

[0002] A boiler's main working principle is to utilize the heat energy released from fuel combustion or waste heat from industrial production to transfer to water within the furnace, raising the water to the required temperature or pressure for steam. Combustion control during the boiler combustion process plays a crucial role in the overall boiler efficiency. As boilers are high-energy-consuming devices, their combustion performance and fuel utilization significantly impact the economic benefits of boiler manufacturers and also influence energy supply and demand. Currently, the adjustment methods for gas-fired and co-fired boilers in related technologies are manual. When various factors such as ambient temperature, fuel type, air composition, and load change, operators find it difficult to accurately adjust the combustion mode, hindering the improvement of boiler thermal efficiency and fuel utilization. Therefore, improving boiler thermal efficiency and fuel utilization has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a boiler combustion system, a boiler combustion control method, a control device and a storage medium that can improve the thermal efficiency of the boiler and the utilization rate of fuel.

[0004] In a first aspect, embodiments of the present invention provide a boiler combustion system, comprising:

[0005] A boiler, including a burner and a flue for exhausting flue gas;

[0006] A gas delivery module includes a main gas pipe and a gas regulating valve, wherein the main gas pipe is connected to the burner through the gas regulating valve;

[0007] The air supply module includes a blower for introducing air into the boiler, an induced draft fan for drawing flue gas from the boiler to the flue, a waste heat heater for heating the air using the heat in the flue, and a flue gas return processor for filtering and circulating the flue gas in the flue. The waste heat heater is located on one side of the flue. The inlet end of the waste heat heater is connected to the air supply end of the blower and the circulation end of the flue gas return processor, respectively. The outlet end of the waste heat heater is connected to the boiler. The air inlet end of the flue gas return processor is connected to the flue, and the exhaust end of the flue gas return processor is connected to the air extraction end of the induced draft fan.

[0008] The combustion detection module includes a pipe detection component for detecting the gas flow rate in the main gas pipe, a pressure detection component for detecting the furnace pressure of the boiler, and a temperature detection component for detecting the combustion temperature of the boiler.

[0009] The boiler combustion system provided by the embodiments of the present invention has at least the following beneficial effects: A waste heat heater is installed on one side of the flue, utilizing the waste heat from the boiler flue to heat the natural air entering the boiler into hot air. Simultaneously, a flue gas return processor recovers and filters the exhaust gas discharged from the boiler, and the filtered high-temperature exhaust gas is transported to the waste heat heater, where it mixes with the natural air, providing auxiliary preheating for the air about to enter the boiler, reducing boiler heat consumption and saving energy. The blower and induced draft fan enable variable pressure airflow regulation in the boiler, ensuring thorough mixing of air and fuel, which helps improve fuel combustion efficiency. Furthermore, the combustion detection module uses pipe detection components, pressure detection components, and temperature detection components to monitor the boiler's combustion and fuel delivery status, providing visual feedback. This allows for timely adjustment of the fuel delivery status by regulating the gas control valve, thereby improving boiler combustion, increasing boiler thermal efficiency, and enhancing fuel utilization.

[0010] In the boiler combustion system provided in this embodiment of the invention, the combustion detection module further includes a first flue gas detection component for detecting the flue gas flow rate of the flue gas return processor, a second flue gas detection component for detecting the exhaust gas flow rate of the induced draft fan, and a third flue gas detection component for detecting the oxygen content in the flue. The first flue gas detection component is located at the air inlet end of the flue gas return processor, the second flue gas detection component is located at the air extraction end of the induced draft fan, and the third flue gas detection component is located at the end of the flue near the flue gas return processor.

[0011] In the boiler combustion system provided in this embodiment of the invention, a flue gas regulating valve is provided between the circulation end of the flue gas return processor and the inlet end of the waste heat heater, and a fresh air regulating valve is provided between the inlet end of the waste heat heater and the air supply end of the blower.

[0012] In the boiler combustion system provided in this embodiment of the invention, the boiler includes a primary air duct and a secondary air duct. The primary air duct is located at the bottom of the boiler, and the secondary air duct is located on the side wall of the boiler and is higher than the primary air duct. The primary air duct and the secondary air duct are respectively connected to the outlet end of the waste heat heater. A first air volume regulating valve is provided between the primary air duct and the waste heat heater, and a second air volume regulating valve is provided between the secondary air duct and the waste heat heater.

[0013] Secondly, embodiments of the present invention provide a boiler combustion control method, applied to the boiler combustion system described in the first aspect embodiment; the boiler combustion control method includes:

[0014] The gas flow rate, the furnace pressure, and the combustion temperature are obtained;

[0015] The target gas delivery rate is determined based on the difference between the combustion temperature and the target temperature, and the difference between the furnace pressure and the target pressure.

[0016] The opening of the gas regulating valve is adjusted according to the target gas delivery volume and the gas flow rate.

[0017] The boiler combustion control method provided by the embodiments of the present invention has at least the following beneficial effects: During fuel combustion, corresponding combustion pressure and temperature are generated in the boiler furnace, and these temperatures and pressures change with the combustion state of the fuel. When the furnace pressure is too high or too low, or the combustion temperature is too low, it can be considered that the fuel combustion is incomplete. Therefore, by using the difference between the combustion temperature and the target temperature in the boiler, and the difference between the furnace pressure and the target pressure, the combustion status of the fuel in the boiler can be determined. Furthermore, the target fuel delivery amount required to adjust the combustion state in the boiler to a highly efficient combustion state can be determined using the combustion status in the boiler. By combining the required target fuel delivery amount with the current gas flow rate, the opening of the gas regulating valve is adjusted to regulate the fuel delivery, improve the boiler combustion, and increase the boiler's thermal efficiency and fuel utilization rate.

[0018] In the boiler combustion control method provided in the embodiments of the present invention, the boiler combustion control method further includes:

[0019] The flue gas flow rate, the exhaust gas flow rate, and the oxygen content are obtained;

[0020] When the flue gas flow rate, the exhaust gas flow rate, and the oxygen content meet the abnormal exhaust conditions, the opening of the gas regulating valve is reduced until the flue gas flow rate, the exhaust gas flow rate, and the oxygen content no longer meet the abnormal exhaust conditions.

[0021] In the boiler combustion control method provided in this embodiment of the invention, the step of reducing the opening of the gas regulating valve when the flue gas flow rate and the exhaust gas flow rate meet the abnormal exhaust conditions includes:

[0022] When the flue gas flow rate, the exhaust gas flow rate, and the oxygen content meet the abnormal exhaust conditions, the opening of the flue gas regulating valve and the opening of the fresh air regulating valve are adjusted, and new flue gas flow rate, new exhaust gas flow rate, and new oxygen content are obtained again.

[0023] When the new flue gas flow rate, the new exhaust gas flow rate, and the new oxygen content do not meet the abnormal exhaust conditions, the opening of the gas regulating valve is reduced.

[0024] In the boiler combustion control method provided in this embodiment of the invention, determining the target gas delivery volume based on the difference between the combustion temperature and the target temperature, and the difference between the furnace pressure and the target pressure, includes:

[0025] When the difference between the combustion temperature and the target temperature is greater than the preset temperature difference, the opening of the first air volume regulating valve and the opening of the second air volume regulating valve are adjusted, and the combustion temperature is reacquired.

[0026] When the difference between the combustion temperature and the target temperature is less than or equal to the preset temperature difference, the target gas delivery volume is determined based on the difference between the furnace pressure and the target pressure.

[0027] Thirdly, embodiments of the present invention provide a boiler combustion control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the boiler combustion control method described in the second aspect of the embodiments above.

[0028] The boiler combustion control device provided according to embodiments of the present invention has at least the following beneficial effects: During fuel combustion, corresponding combustion pressure and temperature are generated in the boiler furnace, and these temperatures and pressures change with the combustion state of the fuel. When the furnace pressure is too high or too low, or the combustion temperature is too low, it can be considered that the fuel combustion is incomplete. Therefore, by using the difference between the combustion temperature and the target temperature in the boiler, and the difference between the furnace pressure and the target pressure, the combustion status of the fuel in the boiler can be determined. Furthermore, the target fuel delivery amount required to adjust the combustion state in the boiler to a highly efficient combustion state can be determined using the combustion status in the boiler. By combining the required target fuel delivery amount with the current gas flow rate, the opening of the gas regulating valve is adjusted to regulate the fuel delivery, improve the boiler combustion, and increase the boiler's thermal efficiency and fuel utilization rate.

[0029] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the boiler combustion control method as described in the second aspect of the embodiments above.

[0030] The computer-readable storage medium provided according to embodiments of the present invention has at least the following beneficial effects: During fuel combustion, corresponding combustion pressure and temperature are generated in the boiler furnace, and these temperatures and pressures change with the combustion state of the fuel. When the furnace pressure is too high or too low, or the combustion temperature is too low, it can be considered that the fuel combustion is incomplete. Therefore, by using the difference between the combustion temperature and the target temperature in the boiler, and the difference between the furnace pressure and the target pressure, the combustion status of the fuel in the boiler can be determined. Furthermore, the target fuel delivery amount required to adjust the combustion state in the boiler to a highly efficient combustion state can be determined using the combustion status in the boiler. By combining the required target fuel delivery amount with the current gas flow rate, the opening of the gas regulating valve is adjusted to regulate the fuel delivery, improve the boiler combustion, and increase the boiler's thermal efficiency and fuel utilization rate.

[0031] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0032] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0034] Figure 1 This is a schematic diagram of the structure of a boiler combustion system provided in an embodiment of the present invention;

[0035] Figure 2 This is a flowchart of the boiler combustion control method provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of another specific process of the boiler combustion control method provided in the embodiment of the present invention;

[0037] Figure 4 This is provided in the embodiments of the present invention. Figure 3 A schematic diagram of a specific process in step S150 is shown;

[0038] Figure 5 This is provided in the embodiments of the present invention. Figure 2 The diagram shows a specific process in step S120;

[0039] Figure 6This is a schematic diagram of the structure of a boiler combustion control device provided in an embodiment of the present invention. Detailed Implementation

[0040] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0041] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, "above," "below," "within," etc. are understood to include the stated number, "at least one" refers to one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. Where "first" and "second" are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0042] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this invention in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0046] Firstly, referring to Figure 1 , Figure 1 A schematic diagram of the boiler combustion system provided in an embodiment of the present invention is shown.

[0047] Understandably, the boiler combustion system 100 includes a boiler 110, a gas delivery module, an air supply module, and a combustion detection module. The boiler 110 includes a burner 111 and a flue 112. The burner 111 serves as the heating element for the boiler 110, while the flue 112 connects to the interior of the boiler 110 to discharge the flue gas generated during combustion. The gas delivery module includes a gas main pipe 121 and a gas regulating valve 122. The gas main pipe 121 connects to the burner 111 via the gas regulating valve 122, allowing the main pipe 121 to receive external gas and deliver it to the burner 111 for ignition and combustion. The gas regulating valve 122 can adjust the gas flow rate by changing its opening. The air supply module includes a blower 131, an induced draft fan 132, a waste heat heater 133, and a flue gas return processor 134. Waste heat heater 133 is located outside flue 112. Waste heat heater 133 includes an inlet end and an outlet end. The inlet end of waste heat heater 133 is connected to the air supply end of blower 131 and the circulation end of flue gas return processor 134, respectively. The outlet end of waste heat heater 133 is connected to boiler 110. Blower 131 is used to introduce natural air into boiler 110. Therefore, waste heat heater 133 can use the waste heat of high-temperature flue gas flowing in flue 112 to preheat the natural air entering boiler 110, thereby reducing the heat consumption of boiler 110 and energy consumption. The inlet of the flue gas recirculation processor 134 is connected to the flue gas 112, and the outlet of the flue gas recirculation processor 134 is connected to the exhaust of the induced draft fan 132. The flue gas recirculation processor 134 includes a flue gas recirculator and a flue gas recirculation fan. Part of the flue gas flows from the flue gas 112 through the flue gas recirculator and then into the waste heat heater 133 under the blowing of the flue gas recirculation fan. The other part of the flue gas is discharged from the flue gas 112 under the action of the induced draft fan 132 after flowing through the flue gas recirculator. The flue gas return processor 134 can reintroduce the high-temperature flue gas discharged from the flue 112 into the boiler 110, allowing the flue gas to be re-combusted, improving the thermal efficiency of the boiler 110 and reducing the harmful substances contained in the flue gas. Before reintroducing the high-temperature flue gas into the boiler 110, the flue gas first flows through the waste heat heater 133. In the waste heat heater 133, the high-temperature flue gas mixes with the natural air introduced by the blower 131, helping to increase the temperature of the air entering the boiler 110, reducing heat consumption, and improving the thermal efficiency of the boiler 110. Since the blower 131 introduces natural air into the boiler 110, and the induced draft fan 132 discharges the flue gas from the boiler 110, the blower 131 and the induced draft fan 132 work together to achieve variable pressure airflow regulation.Because the fuel is burned under a fixed air pressure, a thick ash protective layer will form on its surface during the fuel combustion process due to the influence of coal particle size and coal seam thickness. Under a fixed air pressure, it is difficult for air to mix and contact with the fuel under the ash protective layer. However, the blower 131 and the induced draft fan 132 change the air pressure inside the boiler 110, which can blow away the ash protective layer on the surface of the fuel, so that the air and fuel can be fully mixed, which helps the fuel oxidation and improves the fuel utilization rate.

[0048] In addition, the combustion detection module includes a pipeline detection component, a pressure detection component, and a temperature detection component. The pipeline detection component may include a gas flow meter located between the gas main pipe 121 and the gas regulating valve 122, which measures the total amount of gas supplied from the gas main pipe 121 to the burner 111. The pressure detection component may be a pressure gauge or a pressure transmitter. The pressure gauge may be located inside the boiler 110, while the pressure transmitter may be located inside the flue 112. The pressure detection component can detect the furnace pressure inside the boiler 110. The temperature detection component may be an infrared thermometer, which may be located outside the boiler 110. The temperature detection component can detect the combustion temperature of the boiler 110. When various factors such as ambient temperature, fuel type, air composition, and load change, operators find it difficult to accurately determine the combustion status and thus adjust the fuel delivery accordingly. During combustion, the boiler 110 furnace generates corresponding combustion pressure and temperature, which fluctuate with the combustion state. Excessively high or low furnace pressure, or excessively low combustion temperature, indicates incomplete combustion. Therefore, the pipeline detection, pressure detection, and temperature detection components of the combustion detection module can provide direct feedback on the fuel delivery and boiler 110 combustion status. This allows for timely adjustment of the gas delivery via the gas regulating valve 122, improving the boiler 110's combustion performance and ultimately enhancing its thermal efficiency and fuel utilization.

[0049] Understandably, the combustion detection module also includes a first flue gas detection component for detecting the flow rate of flue gas flowing into the flue gas processor 134 and a second flue gas detection component for detecting the flow rate of exhaust gas exiting the flue 112. Additionally, the combustion detection module also includes a third flue gas detection component 135 for detecting the oxygen content in the flue 112. The first flue gas detection component is located at the air inlet of the flue gas processor 134, thus enabling it to detect the total amount of flue gas discharged after fuel combustion in the boiler 110. Since the amount of flue gas produced under normal combustion conditions is within the normal range, the flue gas flow rate obtained from the first flue gas detection component can be used to preliminarily determine whether the fuel combustion in the boiler 110 is normal. The second flue gas detection component is located at the exhaust end of the induced draft fan 132 and is used to detect the flow rate of exhaust gas discharged from the flue 112 to the external environment. The third flue gas detection component 135 is located at the end of the flue 112 near the return smoke processor 134. Thus, the third flue gas detection component 135 can detect the oxygen content in the flue gas emitted after fuel combustion in the boiler 110. The combustion status in the boiler 110 can be determined by the flue gas flow rate and the oxygen content in the flue gas. The utilization rate of the flue gas can also be determined by the exhaust gas flow rate and the flue gas flow rate. This helps to improve the utilization rate of the flue gas by reducing the speed of the induced draft fan 132, while also improving the fuel combustion efficiency.

[0050] It is understandable that a flue gas regulating valve is installed between the circulation end of the flue gas processor 134 and the waste heat heater 133, while a fresh air regulating valve is installed between the air supply end of the waste heat heater 133 and the blower 131. Adjusting the opening of the flue gas regulating valve changes the high-temperature flue gas flowing into the waste heat heater 133, reducing the oxygen content in the boiler 110 and preventing excessive excess air, which increases heat loss. Adjusting the opening of the fresh air regulating valve changes the amount of natural air flowing into the waste heat heater 133, increasing the oxygen content in the boiler 110 and preventing incomplete fuel combustion. Therefore, by adjusting the ratio of natural air to high-temperature flue gas entering the waste heat heater 133, the thermal efficiency of the boiler 110 and the fuel combustion efficiency can be adjusted. Increasing the ratio of natural air to high-temperature flue gas helps to fully mix fuel and air, improving fuel combustion efficiency; while decreasing the ratio helps to increase the temperature of the air entering the boiler 110, reducing heat loss and improving the thermal efficiency of the boiler 110.

[0051] It is understood that the boiler 110 has a primary air duct and a secondary air duct inside. The primary air duct is located at the bottom of the boiler 110, while the secondary air duct is located above the primary air duct. Both the primary and secondary air ducts are connected to the outlet end of the waste heat heater 133. Thus, part of the air discharged from the waste heat heater 133 can be supplied from the bottom of the boiler 110 through the primary air duct to provide oxygen for fuel combustion, while the other part can be supplied to the interior of the boiler 110 through the secondary air duct, where heated air can be added to agitate the fuel, ensuring thorough mixing between fuel and air and improving fuel combustion efficiency. A first airflow regulating valve is installed at the outlet end of the primary air duct and the waste heat heater 133, and a second airflow regulating valve is installed between the secondary air duct and the waste heat heater 133. By adjusting the opening of the first and second airflow regulating valves, the airflow entering the primary and secondary air ducts can be adjusted, thereby regulating the oxygen supply, ensuring complete combustion of the fuel gas, and simultaneously adjusting the oxygen distribution within the boiler 110, agitating the fuel, and improving combustion conditions. For example, the opening of the first air volume regulating valve can be reduced, the opening of the second air volume regulating valve can be increased, the air volume of the secondary air duct can be increased, and the air volume of the primary air duct can be reduced, thereby enhancing the intensity of the 110 stratified combustion of the boiler, which helps to achieve complete combustion of fuel and improve combustion efficiency.

[0052] It will be understood by those skilled in the art that Figure 1 The structure of the boiler combustion system 100 shown does not constitute a limitation on the embodiments of the present invention. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0053] Based on the architecture of the boiler combustion system 100 provided in the first aspect embodiment above, various embodiments of the boiler combustion control method of the second aspect of the present invention are proposed.

[0054] Reference Figure 2 , Figure 2 This is a flowchart of a boiler combustion control method provided in an embodiment of the present invention. This boiler combustion control method can be applied to, for example... Figure 1 The boiler combustion system 100, the boiler combustion control method includes, but is not limited to, the following steps:

[0055] Step S110: Obtain the gas flow rate, furnace pressure, and combustion temperature;

[0056] Step S120: Determine the target gas delivery rate based on the difference between the combustion temperature and the target temperature, and the difference between the furnace pressure and the target pressure;

[0057] Step S130: Adjust the opening of the gas regulating valve according to the target gas delivery volume and gas flow rate.

[0058] Understandably, combustion temperature and furnace pressure in a boiler can be used to assess fuel combustion. Under normal combustion conditions, fuel combustion produces high temperatures, and these temperatures reflect the efficiency and completeness of combustion. Both excessively high and low combustion temperatures under normal circumstances indicate combustion problems. For example, a low combustion temperature may indicate incomplete combustion, producing harmful byproducts such as carbon monoxide, and reducing boiler thermal efficiency due to heat loss. Conversely, excessively high combustion temperatures can lead to overheating and damage to burner components. Simultaneously, under normal combustion conditions, a certain combustion pressure is generated within the boiler furnace, which varies with the combustion state. Monitoring and analyzing changes in furnace pressure provides a preliminary understanding of the fuel combustion status. Both excessively high and low furnace pressures under normal conditions may indicate incomplete fuel combustion. For instance, excessively high furnace pressure suggests over-combustion, leading to increased carbon monoxide levels in the flue gas and black smoke emissions. Conversely, excessively low furnace pressure indicates insufficient fuel combustion, failing to achieve the expected combustion efficiency. Therefore, by comparing the difference between the combustion temperature and the target temperature, as well as the difference between the furnace pressure and the target pressure, a comprehensive judgment of the fuel combustion status within the boiler can be made. This helps improve the accuracy of the combustion status assessment, and thus accurately determines the target fuel delivery amount required for the boiler to achieve efficient combustion. Using the current gas flow rate detected by the pipeline detection component, combined with the target fuel delivery amount, the required fuel adjustment amount is determined. This allows for adjustment of the gas regulating valve opening, monitoring the fuel delivery status to ensure the gas flow rate matches the target fuel delivery amount, thereby improving boiler combustion and increasing fuel combustion efficiency and utilization.

[0059] Reference Figure 3 An embodiment of the present invention provides a boiler combustion control method, in Figure 2 The boiler combustion control method shown also includes steps S140 to S150:

[0060] Step S140: Obtain flue gas flow rate, exhaust gas flow rate, and oxygen content;

[0061] Step S150: When the flue gas flow rate, exhaust gas flow rate, and oxygen content meet the abnormal exhaust conditions, reduce the opening of the gas regulating valve until the flue gas flow rate and exhaust gas flow rate no longer meet the abnormal exhaust conditions.

[0062] It is understandable that the flue gas flow rate flowing into the flue gas return processor is the total amount of flue gas discharged after the initial combustion of fuel in the boiler, the exhaust gas flow rate flowing to the induced draft fan is the total amount of exhaust gas discharged after the combustion of fuel in the boiler under flue gas circulation, and the oxygen content flowing into the flue is the amount of oxygen remaining after the combustion of fuel in the boiler, i.e., the oxygen content in the discharged flue gas. Since the amount of flue gas produced by fuel under normal combustion conditions is relatively stable, if the flue gas flow rate and oxygen content are too high, it can be considered that the excess air coefficient in the boiler is too large. A large amount of flue gas discharged will take away heat from the boiler, increasing heat loss and wasting resources. If the flue gas flow rate or oxygen content is too low, it can be considered that the fuel combustion in the boiler is incomplete. At the same time, if the total exhaust gas volume is too high, it can be considered that the flue gas utilization rate is too low, which easily increases heat loss. If the total exhaust gas volume is too low, it can be considered that the air content in the boiler is low, which is not conducive to fuel combustion. Therefore, the flue gas flow rate, exhaust gas flow rate, and oxygen content can be used to determine whether the fuel combustion in the boiler is normal. When the flue gas flow rate, exhaust gas flow rate, and oxygen content meet the abnormal exhaust conditions, it can be assumed that the fuel combustion in the boiler is abnormal. The opening of the gas regulating valve should be reduced to decrease the fuel supply, preventing incomplete combustion that would affect fuel utilization and generate large amounts of harmful gases. Operators should be promptly alerted to make adjustments. Abnormal exhaust conditions can be defined as at least one of the following three sub-conditions: the difference between the flue gas flow rate and the preset target flue gas flow rate is greater than a preset flue gas difference; the difference between the exhaust gas flow rate and the preset target exhaust gas flow rate is greater than a preset exhaust gas difference; or the difference between the oxygen content and the preset target oxygen content is greater than a preset oxygen difference. By reducing the opening of the gas regulating valve and decreasing the fuel supply, incomplete combustion can be reduced. Simultaneously, the flue gas flow rate, exhaust gas flow rate, and oxygen content are monitored in real time, and the opening of the gas regulating valve is adjusted accordingly until these parameters no longer meet the abnormal exhaust conditions, thus reducing the generation of harmful gases.

[0063] Reference Figure 4 An embodiment of the present invention provides a boiler combustion control method, in Figure 3 The illustrated step S150 also includes steps S210 to S220:

[0064] Step S210: When the flue gas flow rate, exhaust gas flow rate, and oxygen content meet the abnormal exhaust conditions, adjust the opening of the flue gas regulating valve and the fresh air regulating valve, and re-obtain new flue gas flow rate, new exhaust gas flow rate, and new oxygen content.

[0065] Step S220: When the new flue gas flow rate, new exhaust gas flow rate, and new oxygen content do not meet the abnormal exhaust conditions, reduce the opening of the gas regulating valve.

[0066] Understandably, to improve the utilization rate of high-temperature flue gas and the thermal efficiency of the boiler, adjusting the opening of the flue gas regulating valve can alter the flow of high-temperature flue gas into the waste heat heater, while adjusting the opening of the fresh air regulating valve can alter the flow of natural air into the waste heat heater and the oxygen entering the boiler. Thus, by adjusting the ratio of natural air to high-temperature flue gas entering the waste heat heater, the boiler's thermal efficiency and fuel combustion efficiency can be regulated. Increasing the ratio of natural air to high-temperature flue gas helps increase the amount of oxygen entering the boiler, ensuring thorough mixing of fuel and air and improving fuel combustion efficiency. Conversely, decreasing the ratio helps reduce the amount of oxygen entering the boiler, increasing the temperature of the air entering the boiler, reducing flue gas emissions, avoiding severe heat loss, and improving boiler thermal efficiency. Therefore, when the flue gas flow rate, exhaust gas flow rate, and oxygen content meet the abnormal exhaust conditions, the opening of the flue gas regulating valve and the fresh air regulating valve can be adjusted to improve fuel combustion within the boiler, thereby requiring a re-evaluation of the flue gas flow rate, exhaust gas flow rate, and oxygen content. Abnormal exhaust conditions can be caused by the difference between flue gas flow rate and exhaust gas flow rate being less than the preset flow rate difference, or by the oxygen content being higher than the preset oxygen target content. This indicates that the utilization rate of the high-temperature flue gas in the boiler is currently low, resulting in a large volume of exhaust gas and potentially increasing boiler heat loss. It is necessary to increase the ratio of flue gas flow rate to exhaust gas flow rate and increase the introduction of high-temperature flue gas, i.e., increase the opening of the flue gas regulating valve, to reduce boiler heat loss. Abnormal exhaust conditions can also be caused by the flue gas flow rate being less than the target flue gas flow rate or the oxygen content being less than the target oxygen content. This indicates that the fuel combustion in the boiler may be abnormal, i.e., incomplete combustion. Therefore, it is necessary to decrease the ratio of flue gas flow rate to exhaust gas flow rate, increase the opening of the fresh air regulating valve, increase the introduction of natural air, increase the oxygen content in the boiler, and promote fuel combustion.

[0067] After adjusting the flue gas regulating valve and the fresh air regulating valve, the new flue gas flow rate and the new exhaust gas flow rate are re-detected using the first flue gas detection component and the second flue gas detection component. If the new flue gas flow rate and the new exhaust gas flow rate obtained after adjustment still do not meet the abnormal exhaust conditions, it indicates that the fuel combustion in the boiler is incomplete. In order to avoid generating a large amount of harmful gases and wasting fuel, the opening of the gas regulating valve is reduced, fuel delivery is reduced, and the operator is promptly reminded to check for abnormalities in the boiler.

[0068] Reference Figure 5 An embodiment of the present invention provides a boiler combustion control method, in Figure 2 The illustrated step S120 also includes steps S310 to S320:

[0069] Step S310: When the difference between the combustion temperature and the target temperature is greater than the preset temperature difference, adjust the opening of the first air volume regulating valve and the opening of the second air volume regulating valve, and reacquire the combustion temperature.

[0070] Step S320: When the difference between the combustion temperature and the target temperature is less than or equal to the preset temperature difference, the target gas delivery volume is determined based on the difference between the furnace pressure and the target pressure.

[0071] Understandably, when the combustion temperature is lower than the target temperature, and the difference between the combustion temperature and the target temperature is greater than the preset temperature difference, it indicates that the current combustion temperature is too low and the fuel combustion is incomplete. This can be addressed by adjusting the opening of the first airflow regulating valve to increase the oxygen supplied to the fuel, promote fuel combustion, and thus increase the combustion temperature. Alternatively, the opening of the second airflow regulating valve can be adjusted to provide greater air pressure or pulse air pressure to agitate the fuel, ensuring thorough mixing between fuel and air, improving fuel combustion efficiency, and thus increasing the combustion temperature. For example, increasing the opening of the first airflow regulating valve and decreasing the opening of the second airflow regulating valve can increase the airflow in the primary air duct and decrease the airflow in the secondary air duct, thereby increasing the oxygen content introduced into the boiler, promoting fuel combustion, and increasing the combustion temperature.

[0072] When the combustion temperature is higher than the target temperature, and the difference between the combustion temperature and the target temperature is greater than the preset temperature difference, it indicates that the current combustion temperature is too high and may easily damage the internal components of the boiler. Therefore, the combustion temperature can be reduced by decreasing the opening of the first air volume regulating valve, increasing the opening of the second air volume regulating valve, increasing the air volume of the secondary air duct, reducing the air volume of the primary air duct, increasing the ratio of flue gas to fuel, and lowering the combustion temperature.

[0073] Therefore, the airflow entering the primary air duct and the secondary air duct can be adjusted by regulating the opening of the first and second airflow regulating valves, thereby regulating the oxygen supply to ensure complete combustion of the fuel gas. Simultaneously, the oxygen distribution within the boiler is adjusted, the fuel is disturbed, and combustion conditions are improved. The combustion ratio of fuel gas to flue gas can also be adjusted to regulate the combustion process within the boiler. When the difference between the combustion temperature and the target temperature is less than or equal to the preset temperature difference, it indicates that the fuel in the boiler is currently in a normal combustion state. Therefore, the difference between the furnace pressure and the target pressure can be used to determine a more accurate target fuel gas delivery rate, improving fuel combustion efficiency.

[0074] Thirdly, referring to Figure 6 This invention provides a boiler combustion control device 600, including a memory 620, a processor 610, and a computer program stored in the memory 620 and executable on the processor 610. The processor 610 executes the program to implement the boiler combustion control method of the second aspect embodiment described above, for example, by performing... Figure 2 Method steps S110 to S130, Figure 3 Method steps S140 to S150, or execution Figure 4 Method steps S210 to S220, or execution Figure 5 Method steps S310 to S320.

[0075] According to the boiler combustion control device provided in this embodiment of the invention, since corresponding combustion pressure and combustion temperature are generated in the boiler furnace during the combustion process, and the combustion temperature and combustion pressure change with the combustion state of the fuel, when the furnace pressure is too high or too low, or the combustion temperature is too low, it can be considered that the fuel combustion is incomplete. Therefore, by using the difference between the combustion temperature and the target temperature in the boiler, and the difference between the furnace pressure and the target pressure, the combustion status of the fuel in the boiler can be determined. Furthermore, the target fuel delivery amount required to adjust the combustion state in the boiler to a high-efficiency combustion state can be determined based on the combustion status in the boiler. Combining the required target fuel delivery amount with the current gas flow rate, the opening of the gas regulating valve is adjusted to regulate the fuel delivery, improve the boiler combustion, and increase the boiler's thermal efficiency and fuel utilization rate.

[0076] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the boiler combustion control method of the second aspect embodiment above, for example, executing... Figure 2 Method steps S110 to S130, Figure 3 Method steps S140 to S150, or execution Figure 4 Method steps S210 to S220, or execution Figure 5 Method steps S310 to S320.

[0077] According to the computer-readable storage medium provided in the embodiments of the present invention, since corresponding combustion pressure and combustion temperature are generated in the boiler furnace during the combustion process, and the combustion temperature and combustion pressure change with the combustion state of the fuel, when the furnace pressure is too high or too low, or the combustion temperature is too low, it can be considered that the fuel combustion is incomplete. Therefore, by using the difference between the combustion temperature and the target temperature in the boiler, and the difference between the furnace pressure and the target pressure, the combustion status of the fuel in the boiler can be determined. Furthermore, the target fuel delivery amount required to adjust the combustion state in the boiler to a high-efficiency combustion state can be determined using the combustion status in the boiler. By combining the required target fuel delivery amount with the current gas flow rate, the opening of the gas regulating valve is adjusted to regulate the fuel delivery, improve the boiler combustion, and increase the boiler's thermal efficiency and fuel utilization rate.

[0078] This invention also discloses a computer program product, including a computer program or computer instructions, which are stored in a computer-readable storage medium. The processor of the boiler combustion control device reads the computer program or computer instructions from the computer-readable storage medium and executes the computer program or computer instructions, causing the boiler combustion control device to perform the boiler combustion control method of the air conditioning system as described in the previous embodiment.

[0079] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Integrated physical components, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. As is known to those skilled in the art, a computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0080] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A boiler combustion control method, characterized in that, Applied to a boiler combustion system, the boiler combustion system comprising: A boiler, including a burner and a flue for exhausting flue gas; A gas delivery module includes a main gas pipe and a gas regulating valve, wherein the main gas pipe is connected to the burner through the gas regulating valve; The air supply module includes a blower for introducing air into the boiler, an induced draft fan for drawing flue gas from the boiler to the flue, a waste heat heater for heating the air using the heat in the flue, and a flue gas return processor for filtering and circulating the flue gas in the flue. The waste heat heater is located on one side of the flue. The inlet end of the waste heat heater is connected to the air supply end of the blower and the circulation end of the flue gas return processor, respectively. The outlet end of the waste heat heater is connected to the boiler. The air inlet end of the flue gas return processor is connected to the flue, and the exhaust end of the flue gas return processor is connected to the air extraction end of the induced draft fan. The combustion detection module includes a pipe detection component for detecting the gas flow rate in the main gas pipe, a pressure detection component for detecting the furnace pressure of the boiler, and a temperature detection component for detecting the combustion temperature of the boiler. The boiler also includes a primary air duct and a secondary air duct. The primary air duct is located at the bottom of the boiler, and the secondary air duct is located on the side wall of the boiler and is higher than the primary air duct. The primary air duct and the secondary air duct are respectively connected to the outlet end of the waste heat heater. A first air volume regulating valve is provided between the primary air duct and the waste heat heater, and a second air volume regulating valve is provided between the secondary air duct and the waste heat heater. The boiler combustion control method includes: The gas flow rate, the furnace pressure, and the combustion temperature are obtained; When the difference between the combustion temperature and the target temperature is greater than the preset temperature difference, the opening of the first air volume regulating valve and the opening of the second air volume regulating valve are adjusted, and the combustion temperature is reacquired. When the difference between the combustion temperature and the target temperature is less than or equal to the preset temperature difference, the target gas delivery volume is determined based on the difference between the furnace pressure and the target pressure. The opening of the gas regulating valve is adjusted according to the target gas delivery volume and the gas flow rate.

2. The boiler combustion control method according to claim 1, characterized in that, The combustion detection module further includes a first flue gas detection component for detecting the flue gas flow rate of the smoke return processor, a second flue gas detection component for detecting the exhaust gas flow rate of the induced draft fan, and a third flue gas detection component for detecting the oxygen content in the flue. The first flue gas detection component is located at the air inlet end of the smoke return processor, the second flue gas detection component is located at the air extraction end of the induced draft fan, and the third flue gas detection component is located at the end of the flue near the smoke return processor.

3. The boiler combustion control method according to claim 2, characterized in that, A flue gas regulating valve is provided between the circulation end of the flue gas return processor and the inlet end of the waste heat heater, and a fresh air regulating valve is provided between the inlet end of the waste heat heater and the air supply end of the blower.

4. The boiler combustion control method according to claim 2, characterized in that, The boiler combustion control method further includes: The flue gas flow rate, the exhaust gas flow rate, and the oxygen content are obtained; When the flue gas flow rate, the exhaust gas flow rate, and the oxygen content meet the abnormal exhaust conditions, the opening of the gas regulating valve is reduced until the flue gas flow rate, the exhaust gas flow rate, and the oxygen content no longer meet the abnormal exhaust conditions.

5. The boiler combustion control method according to claim 4, characterized in that, A flue gas regulating valve is provided between the circulation end of the flue gas processor and the inlet end of the waste heat heater, and a fresh air regulating valve is provided between the inlet end of the waste heat heater and the air supply end of the blower; the step of reducing the opening of the gas regulating valve when the flue gas flow rate, the exhaust gas flow rate, and the oxygen content meet the abnormal exhaust conditions includes: When the flue gas flow rate, the exhaust gas flow rate, and the oxygen content meet the abnormal exhaust conditions, the opening of the flue gas regulating valve and the opening of the fresh air regulating valve are adjusted, and new flue gas flow rate, new exhaust gas flow rate, and new oxygen content are obtained again. When the new flue gas flow rate, the new exhaust gas flow rate, and the new oxygen content do not meet the abnormal exhaust conditions, the opening of the gas regulating valve is reduced.

6. A boiler combustion control device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the boiler combustion control method as described in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the boiler combustion control method as described in any one of claims 1 to 5.

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