Boiler control system and method

Abstract

The present disclosure relates to a boiler control system and method, the boiler control system comprising at least one differential pressure measurer, a differential pressure controller and a first air damper adjusting actuator, the differential pressure measurer being configured to detect pressure information of a secondary air wind box and a furnace and send the detected pressure information to the differential pressure controller; the differential pressure controller being connected with the first air damper adjusting actuator and configured to receive the pressure information sent by the differential pressure measurer, determine a control signal to be sent to the first air damper adjusting actuator according to the pressure information between the secondary air wind box and the furnace; and the first air damper adjusting actuator being configured to adjust the opening degree of the first adjusting air damper according to the control signal sent by the differential pressure controller. In this way, the opening degree of the first adjusting air damper can be adjusted in real time according to the actual pressure information of the secondary air wind box and the furnace, so that the fuel in the furnace can be fully combusted, thereby effectively improving the working efficiency of the boiler.

Description

Technical Field

[0001] This disclosure relates to boiler control technology, specifically to a boiler control system and method. Background Technology

[0002] In recent years, with the establishment of new energy power plants such as photovoltaic power stations, wind power generation, and hydropower, thermal power plants need to participate in deep peak shaving as much as possible. When the load on the power grid is low, the active power of thermal power plants decreases, and the operating efficiency of boilers also needs to be reduced. To reduce boiler operating efficiency, it is necessary to reduce the amount of pulverized coal entering the furnace and the amount of secondary air. However, when the amount of secondary air is reduced to a certain extent, the secondary air velocity decreases, the penetration decreases, the combustion conditions in the furnace become unstable, the heat distribution becomes uneven, the combustion conditions deteriorate, efficiency decreases, pulverized coal combustion is incomplete, and corrosive gases remain along the furnace wall pipes, leading to accelerated pipe corrosion and thus affecting pipe life. Summary of the Invention

[0003] To achieve the above objectives, this disclosure provides a boiler control system and method.

[0004] A first aspect of this disclosure provides a boiler control system, the system comprising: at least one differential pressure measuring device, a differential pressure controller, a first damper regulating actuator, and a first regulating damper;

[0005] The first detection end of the differential pressure measuring device is set on the secondary air box of the boiler, the second detection end of the differential pressure measuring device is set on the furnace of the boiler, and the output end of the differential pressure measuring device is connected to the differential pressure controller. The differential pressure measuring device is used to detect the pressure information of the secondary air box and the furnace, and send the detected pressure information to the differential pressure controller.

[0006] The differential pressure controller is connected to the first damper adjustment actuator and is used to receive pressure information sent by the differential pressure measuring device, and determine to send a control signal to the first damper adjustment actuator based on the pressure information between the secondary air box and the furnace.

[0007] The first damper adjustment actuator is connected to the first damper and is used to adjust the opening of the first damper according to the control signal sent by the differential pressure controller.

[0008] Optionally, the differential pressure controller is configured to send a first control signal to the first damper actuator if it is determined that the pressure difference between the secondary air box and the furnace is greater than a first preset differential pressure threshold, and to send a second control signal to the first damper actuator if it is determined that the pressure difference between the secondary air box and the furnace is less than a second preset differential pressure threshold.

[0009] The first damper regulating actuator is used to decrease the opening of the first regulating damper when receiving a first control signal, and to increase the opening of the first regulating damper when receiving a second control signal.

[0010] Optionally, the secondary air box includes multiple independent air chambers. Each of the independent air chambers in the secondary air box is equipped with a first detection terminal of the differential pressure measuring device. Each independent air chamber is provided with an air inlet and an air outlet. The air inlet is provided with a first regulating damper for regulating the ventilation of the air inlet. The air outlet is provided with an air chamber nozzle.

[0011] Each differential pressure measuring device is used to detect the pressure information of its respective independent air chamber and the furnace, and send the detected pressure information to the differential pressure controller.

[0012] Optionally, the plurality of independent air chambers include a first type of air chamber and a second type of air chamber. A partition plate is provided in the first type of air chamber along the direction from the air inlet to the air outlet. A second regulating damper is also provided in the first type of air chamber. The second regulating damper is located on one side of the partition plate and between the first regulating damper and the air chamber nozzle. The second regulating damper is used to regulate the ventilation volume entering the furnace.

[0013] Optionally, the system further includes a second damper regulating actuator, wherein the signal input terminal of the second damper regulating actuator is connected to the signal output terminal of the differential pressure controller and the signal input terminal of the first damper regulating actuator, and the control output terminal of the second damper regulating actuator is connected to the second regulating damper;

[0014] The differential pressure controller is further configured to send a third control signal to the second damper actuator when it is determined that the pressure difference between the secondary air box and the furnace is less than a first preset differential pressure threshold and greater than a third preset differential pressure threshold.

[0015] The second damper regulating actuator is used to receive a third control signal sent by the differential pressure controller to reduce the opening of the second regulating damper.

[0016] Optionally, the system further includes a wind speed measuring device, the signal output terminal of which is connected to the second damper regulating actuator;

[0017] The wind speed measuring device is used to detect the wind speed information passing through the second regulating damper and send the wind speed information to the second damper regulating actuator;

[0018] The second damper adjustment actuator is also used to receive wind speed information sent by the wind speed measuring device, and to stop reducing the opening of the second damper when the wind speed is less than a preset wind speed threshold.

[0019] Optionally, the plurality of independent air chambers are arranged horizontally to form an independent air chamber group, and the plurality of independent air chamber groups are arranged vertically to form the secondary air box.

[0020] Optionally, in the plurality of independent air chamber groups forming the secondary air box, at least one of the independent air chamber groups consists of independent air chambers of the first type.

[0021] Optionally, the second regulating dampers of different independent air chambers in the independent air chamber group, all of which are composed of the first type of air chambers, are arranged on the same side of the partition plate.

[0022] A second aspect of this disclosure provides a boiler control method applied to the differential pressure controller described in the first aspect, the method comprising:

[0023] The differential pressure between the secondary air box and the furnace, the control coefficients for the flame temperature index in the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field are obtained.

[0024] An automatic control curve is generated based on the differential pressure between the secondary air box and the furnace, the control coefficients for the flame temperature index in the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field.

[0025] The aerodynamic field tangent of the boiler is controlled according to the automatic control curve.

[0026] Through the above technical solution, the boiler control system includes at least one differential pressure measuring device, a differential pressure controller, a first damper adjustment actuator, and a first regulating damper. The first detection end of the differential pressure measuring device is installed on the secondary air box of the boiler, and the second detection end of the differential pressure measuring device is installed on the furnace of the boiler. The output end of the differential pressure measuring device is connected to the differential pressure controller. The differential pressure measuring device is used to detect the pressure information of the secondary air box and the furnace, and send the detected pressure information to the differential pressure controller. The differential pressure controller is connected to the first damper adjustment actuator and is used to receive the pressure information sent by the differential pressure measuring device. Based on the pressure information between the secondary air box and the furnace, it determines to send a control signal to the first damper adjustment actuator. The first damper adjustment actuator is connected to the first regulating damper and is used to adjust the opening degree of the first regulating damper according to the control signal sent by the differential pressure controller. In this way, the opening degree of the first regulating damper can be adjusted in real time according to the actual pressure information of the secondary air box and the furnace, so that the fuel in the furnace can be fully combusted, thereby effectively improving the working efficiency of the boiler.

[0027] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of a boiler control system according to an exemplary embodiment of the present disclosure;

[0030] Figure 2 This is a schematic diagram illustrating another boiler control system according to an exemplary embodiment of the present disclosure;

[0031] Figure 3 It is based on Figure 2 A schematic diagram of another boiler control system is shown in the embodiment;

[0032] Figure 4 It is based on Figure 1 A schematic diagram of another boiler control system shown in the embodiment;

[0033] Figure 5 It is based on Figure 4 A schematic diagram of another boiler control system is shown in the embodiment;

[0034] Figure 6 This is a flowchart illustrating a boiler control method according to an exemplary embodiment of the present disclosure.

[0035] Explanation of reference numerals in the attached figures

[0036] 100-Boiler control system, 101-Differential pressure measuring device, 102-Differential pressure controller, 103-First damper regulating actuator, 104-Second damper regulating actuator, 201-Secondary air box, 2011-Multiple independent air chambers, 2012-Divider plate, 202-Furnace, 203-First regulating damper, 204-Second regulating damper, 205-Wind speed measuring device. Detailed Implementation

[0037] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0038] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0039] Figure 1 This is a schematic diagram of a boiler control system according to an exemplary embodiment of the present disclosure, such as... Figure 1 As shown, the boiler control system 100 may include: at least one differential pressure measuring device 101, a differential pressure controller 102, a first damper regulating actuator 103, and a first regulating damper 203; the first detection end of the differential pressure measuring device 101 may be installed on the secondary air box 201 of the boiler, the second detection end of the differential pressure measuring device 101 may be installed on the furnace 202 of the boiler, and the output end of the differential pressure measuring device 101 may be connected to the differential pressure controller 102. The differential pressure measuring device 101 can be used to detect the pressure information of the secondary air box 201 and the furnace 202, and The detected pressure information is sent to the differential pressure controller 102; the differential pressure controller 102 can be connected to the first damper regulating actuator 103. The differential pressure controller 102 can be used to receive the pressure information sent by the differential pressure measuring device 101, and determine to send a control signal to the first damper regulating actuator 103 based on the pressure information between the secondary air box 201 and the furnace 202; the first damper regulating actuator 103 can be connected to the first regulating damper 203, and is used to adjust the opening degree of the first regulating damper 203 according to the control signal sent by the differential pressure controller 102.

[0040] The pressure information may include the pressure value and the time of pressure detection. The differential pressure controller 102 can send a first control signal to the first damper actuator 103 if it determines that the pressure difference between the secondary air box 201 and the furnace 202 is greater than a first preset differential pressure threshold, and send a second control signal to the first damper actuator 103 if it determines that the pressure difference between the secondary air box 201 and the furnace 202 is less than a second preset differential pressure threshold. The first damper actuator 103 can decrease the opening of the first regulating damper 203 upon receiving the first control signal, and increase the opening of the first regulating damper 203 upon receiving the second control signal. The first and second preset differential pressure thresholds can be preset based on the boiler operating status, and can be obtained according to the actual boiler operating status.

[0041] For example, when the power grid's electricity demand is at its peak and off-peak, it is necessary to reduce the power generation of the thermal power plant. At this time, the pressure difference between the secondary air box 201 and the furnace 202 can be 0.3 kPa to 0.4 kPa. The first preset pressure difference threshold can be 0.4 kPa, and the second preset pressure difference threshold can be 0.3 kPa. If it is determined that the pressure difference between the secondary air box 201 and the furnace 202 is greater than 0.4 kPa, i.e., the first preset pressure difference threshold, then a first control signal is sent to the first damper regulating actuator 103. The first damper regulating actuator 103 controls the opening of the first regulating damper 203 to decrease, so as to reduce the pressure difference between the secondary air box 201 and the furnace 202; if it is determined that the pressure difference between the secondary air box 201 and the furnace 202 is less than 0.3 kPa, that is, the second preset pressure difference threshold, then a second control signal is sent to the first damper regulating actuator 103, and the first damper regulating actuator 103 controls the opening of the first regulating damper 203 to increase, so as to increase the pressure difference between the secondary air box 201 and the furnace 202.

[0042] The above technical solution includes a boiler control system comprising at least one differential pressure measuring device, a differential pressure controller, a first damper regulating actuator, and a first regulating damper. The first detection end of the differential pressure measuring device is mounted on the secondary air box of the boiler, and the second detection end is mounted on the furnace. The output end of the differential pressure measuring device is connected to the differential pressure controller. The differential pressure measuring device detects the pressure information of the secondary air box and the furnace and sends the detected pressure information to the differential pressure controller. The differential pressure controller is connected to the first damper regulating actuator and receives the pressure information sent by the differential pressure measuring device. Based on the pressure information between the secondary air box and the furnace, it determines the control signal to send to the first damper regulating actuator. The first damper regulating actuator is connected to the first regulating damper and adjusts the opening degree of the first regulating damper according to the control signal sent by the differential pressure controller. In this way, the opening degree of the first regulating damper can be adjusted in real time according to the actual pressure information of the secondary air box and the furnace, ensuring complete combustion of fuel in the furnace and effectively improving boiler efficiency.

[0043] Figure 2 This is a schematic diagram illustrating another boiler control system according to an exemplary embodiment of the present disclosure, such as... Figure 2 As shown, the secondary air box 201 may include multiple independent air chambers 2011. Each independent air chamber 2011 in the secondary air box 201 may be equipped with a first detection terminal of a differential pressure measuring device 101. The independent air chamber 2011 is provided with an air inlet and an air outlet. The air inlet may be provided with a first regulating damper 203, which is used to regulate the ventilation of the air inlet. The air outlet may be provided with an air chamber nozzle. Each differential pressure measuring device 101 can be used to detect the pressure information of the independent air chamber 2011 and the furnace 202, and send the detected pressure information to the differential pressure controller 102.

[0044] It should be noted that multiple independent air chambers 2011 are arranged horizontally to form an independent air chamber group, and multiple independent air chamber groups are arranged vertically to form a secondary air box 201. Each independent air chamber 2011 is equipped with a first regulating damper 203 at its air inlet. The first regulating damper 203 controls the air volume entering the independent air chamber. Each independent air chamber 2011 in the secondary air box 201 can be equipped with a first detection terminal of a differential pressure measuring device 101 to detect the pressure information of each independent air chamber 2011 and the furnace 202 and send it to the differential pressure controller 102. The differential pressure controller 102 can synchronously regulate the ventilation volume of the independent air chamber 2011 by the first regulating damper 203 through the first regulating damper regulating actuator 103, or it can differentially regulate the ventilation volume of the independent air chamber 2011 by the first regulating damper 203 through the first regulating damper regulating actuator 103. There can be one or more first regulating dampers 103, each corresponding to a first regulating damper 203.

[0045] The above scheme, by installing a differential pressure measuring device at the first detection end in each independent air chamber, detects the pressure information of each independent air chamber and can differentially adjust the first regulating damper, thereby accurately controlling the pressure difference between the secondary air box and the furnace, which is beneficial to improving the reliability of the boiler control system.

[0046] Figure 3 It is based on Figure 2 A schematic diagram of another boiler control system is shown in the embodiment, such as... Figure 3 As shown, the multiple independent air chambers 2011 may include a first type of air chamber and a second type of air chamber. A partition plate 2012 may be provided in the first type of air chamber along the direction from the air inlet to the air outlet. A second regulating damper 204 is also provided in the first type of air chamber. The second regulating damper 204 may be provided on one side of the partition plate 2012. The second regulating damper 204 is located between the first regulating damper 203 and the air chamber nozzle. The second regulating damper 204 is used to regulate the ventilation volume entering the furnace 202.

[0047] It should be noted that, to further adjust the air velocity and air volume at the outlet of the secondary air box 201, a partition plate 2012 is installed in the first type of air chamber along the direction from the air inlet to the air outlet, dividing the first type of air chamber into two ventilation ducts along the direction from the air inlet to the air outlet. A second regulating damper 204 is installed in either of the ventilation ducts. The second regulating damper 204 controls the air volume and air velocity in the ventilation duct. The volume ratio of the two ventilation ducts in the first type of air chamber can be adjusted according to the boiler capacity, or the air velocity and air volume can be finely adjusted according to actual needs. In the above-mentioned multiple independent air chamber groups forming the secondary air box 201, at least one independent air chamber group can consist entirely of first type air chambers. The second regulating dampers 204 of different independent air chambers in the independent air chamber group consisting entirely of first type air chambers can be set on the same side of the partition plate 2012.

[0048] The above scheme, by installing a partition plate in the first type of air chamber along the direction from the air inlet to the air outlet, and installing a second regulating damper on one side of the partition plate, can finely adjust the pressure difference between the secondary air box and the furnace, thereby further improving the reliability of the boiler control system.

[0049] Figure 4 It is based on Figure 1 An embodiment shows a schematic diagram of another boiler control system, such as Figure 4As shown, the boiler control system may further include a second damper actuator 104. The signal input terminal of the second damper actuator 104 is connected to the signal output terminal of the differential pressure controller 102 and the signal input terminal of the first damper actuator 103. The control output terminal of the second damper actuator 104 is connected to the second damper 204. The differential pressure controller 102 is also used to send a third control signal to the second damper actuator 104 when it is determined that the pressure difference between the secondary air box 201 and the furnace 202 is less than a first preset differential pressure threshold and greater than a third preset differential pressure threshold. The second damper actuator 104 is used to receive the third control signal sent by the differential pressure controller 102 and reduce the opening of the second damper 204.

[0050] The third preset pressure difference threshold can be the pressure difference between the secondary air box 201 and the furnace 202 when the boiler operates at its highest efficiency under the current operating conditions.

[0051] It should be noted that the differential pressure measuring device 101 detects the pressure information of each independent air chamber 2011 and the furnace 202, and sends it to the differential pressure controller 102. The differential pressure controller 102, based on the pressure difference between the pressure of each independent air chamber 2011 and the corresponding pressure difference in the furnace 202, sends a third control signal to the second damper regulating actuator 104. If it is determined that the pressure difference between one of the independent air chambers 2011 and the furnace 202 is less than a first preset differential pressure threshold and greater than a third preset differential pressure threshold, the second damper regulating actuator 104 sends a third control signal to the second damper regulating actuator 104 to reduce the opening of the second regulating damper 204 in that independent air chamber 2011. The second damper regulating actuator 104 can differentially adjust the second regulating damper 204 to ensure complete combustion of fuel in the boiler.

[0052] Figure 5 It is based on Figure 4 A schematic diagram of another boiler control system is shown in the embodiment, such as... Figure 4 As shown, the system also includes a wind speed measuring device 205, the signal output terminal of which is connected to the second damper regulating actuator 104. The wind speed measuring device 205 is used to detect the wind speed information passing through the second regulating damper 204 and send the wind speed information to the second damper regulating actuator 104. The second damper regulating actuator 104 is also used to receive the wind speed information sent by the wind speed measuring device 205 and stop reducing the opening of the second regulating damper 204 when the wind speed is less than a preset wind speed threshold.

[0053] The preset wind speed threshold can be the minimum wind speed through the second regulating damper 204. The wind speed threshold can be preset one-to-one according to the boiler operating status. When in use, the wind speed threshold corresponding to the actual operating status of the boiler can be obtained, or it can be manually input according to the actual operating status of the boiler.

[0054] It should be noted that, as Figure 3 As shown, the detection end of the wind speed measuring device 205 is located after the second regulating damper 204. It can detect the wind speed information passing through the second regulating damper 204 and send the wind speed information to the second damper regulating actuator 104. The second damper regulating actuator 104 obtains the preset wind speed threshold through the actual operating state of the boiler and compares it with the received wind speed. If the wind speed is less than the preset wind speed threshold, it stops reducing the opening of the second regulating damper 204.

[0055] The above solution, by setting up a wind speed measuring device in the boiler control system, compares the wind speed information detected by the wind speed measuring device with a preset wind speed threshold to determine whether to stop reducing the opening of the second regulating damper. This effectively avoids the hidden dangers caused by excessively reducing the opening of the second regulating damper, which could lead to excessive fluctuations in the air volume entering the furnace through the first type of air chamber and uneven pressure distribution in the furnace. This improves the reliability of the boiler control system.

[0056] Figure 6 This is a flowchart illustrating a boiler control method according to an exemplary embodiment of the present disclosure, applied to the differential pressure controller 102 described above, such as... Figure 6 As shown, the boiler control method includes: acquiring the differential pressure between the secondary air box 201 and the furnace 202, the control coefficients for the flame temperature index of the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field; generating an automatic control curve based on the differential pressure between the secondary air box 201 and the furnace 202, the control coefficients for the flame temperature index of the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field; and controlling the tangential circle of the boiler's aerodynamic field based on the automatic control curve.

[0057] Among them, the control coefficient of flame temperature index in combustion zone is optimal when the flame temperature is uniformly distributed; the minimum value of the control coefficient of nitrogen oxide index is optimal; the control coefficient of reducing atmosphere on water-cooled wall surface is optimal when the reducing atmosphere is low; the control coefficient of metal wall temperature on heated surface is optimal when the metal wall temperature on heated surface is low and uniform; and the control coefficient of tangential circle of aerodynamic field is optimal when the air flow direction and velocity at the corresponding spatial position are closest to the tangential circle.

[0058] It should be noted that when the boiler is operating at full load, the second regulating damper 204 is at 100% opening. The first regulating damper 203 of the independent air chamber regulates the secondary air volume for the first regulating damper 203 opening calibration test. When the boiler is operating at full load, the second regulating damper 204 opening calibration test is carried out under the conditions of 75% rated load, 50% rated load and 40% rated load between the boiler and the minimum stable combustion load. During the test, the pressure difference between the secondary air box 201 and the furnace 202 under the corresponding conditions is recorded first, and the automatic control curve is established. The differential pressure measuring device detects the pressure information of the secondary air box 201 and the furnace 202, and sends it to the differential pressure controller 102. The differential pressure controller 102, based on the received pressure information, obtains the pressure difference between the secondary air box 201 and the furnace 202, as well as the control coefficients for the combustion zone flame temperature, nitrogen oxides, water-cooled wall reducing atmosphere, heated surface metal wall temperature, and aerodynamic field tangential circle. Based on these parameters, it generates an automatic control curve, which controls the aerodynamic field tangential circle of the boiler. This automatic control curve, i.e., the index optimization K-function, is already disclosed in the prior art and has been widely used in the field of boiler control; therefore, it will not be described in detail in this disclosure.

[0059] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not further describe the various possible combinations.

[0060] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A boiler control system, characterized in that, The system includes: at least one differential pressure measuring device, a differential pressure controller, a first damper regulating actuator, and a first regulating damper; The first detection end of the differential pressure measuring device is set on the secondary air box of the boiler, the second detection end of the differential pressure measuring device is set on the furnace of the boiler, and the output end of the differential pressure measuring device is connected to the differential pressure controller. The differential pressure measuring device is used to detect the pressure information of the secondary air box and the furnace, and send the detected pressure information to the differential pressure controller. The differential pressure controller is connected to the first damper adjustment actuator and is used to receive pressure information sent by the differential pressure measuring device, and determine to send a control signal to the first damper adjustment actuator based on the pressure information between the secondary air box and the furnace. The first damper adjustment actuator is connected to the first damper and is used to adjust the opening of the first damper according to the control signal sent by the differential pressure controller. The secondary air box includes multiple independent air chambers, each with an air inlet and an air outlet. The air inlet is equipped with a first regulating damper, and the air outlet is equipped with an air chamber nozzle. The multiple independent air chambers include a first type of air chamber, in which a partition plate is provided along the direction from the air inlet to the air outlet. The first type of air chamber is also equipped with a second regulating damper, which is located on one side of the partition plate and between the first regulating damper and the air chamber nozzle. The second regulating damper is used to regulate the ventilation volume entering the furnace. The system also includes a second damper regulating actuator and a wind speed measuring device. The signal input terminal of the second damper regulating actuator is connected to the signal output terminal of the differential pressure controller and the signal input terminal of the first damper regulating actuator. The control output terminal of the second damper regulating actuator is connected to the second regulating damper. The signal output terminal of the wind speed measuring device is connected to the second damper regulating actuator. The differential pressure controller is further configured to send a third control signal to the second damper actuator if it is determined that the pressure difference between the secondary air box and the furnace is less than a first preset differential pressure threshold and greater than a third preset differential pressure threshold. The second damper regulating actuator is used to receive a third control signal sent by the differential pressure controller to reduce the opening of the second regulating damper; The wind speed measuring device is used to detect the wind speed information passing through the second regulating damper and send the wind speed information to the second damper regulating actuator; The second damper adjustment actuator is also used to receive wind speed information sent by the wind speed measuring device, and to stop reducing the opening of the second damper when the wind speed is less than a preset wind speed threshold.

2. The boiler control system according to claim 1, characterized in that, The differential pressure controller is configured to send a first control signal to the first damper actuator if it is determined that the pressure difference between the secondary air box and the furnace is greater than a first preset differential pressure threshold, and to send a second control signal to the first damper actuator if it is determined that the pressure difference between the secondary air box and the furnace is less than a second preset differential pressure threshold. The first damper regulating actuator is used to decrease the opening of the first regulating damper when receiving a first control signal, and to increase the opening of the first regulating damper when receiving a second control signal.

3. The boiler control system according to claim 2, characterized in that, Each of the independent air chambers in the secondary air box is equipped with a first detection terminal of the differential pressure measuring device. Each differential pressure measuring device is used to detect the pressure information of its respective independent air chamber and the furnace, and send the detected pressure information to the differential pressure controller.

4. The boiler control system according to claim 1, characterized in that, The multiple independent air chambers are arranged horizontally to form an independent air chamber group, and the multiple independent air chamber groups are arranged vertically to form the secondary air box.

5. The boiler control system according to claim 4, characterized in that, In the plurality of independent air chamber groups forming the secondary air box, at least one of the independent air chamber groups consists of independent air chambers of the first type.

6. The boiler control system according to claim 5, characterized in that, In the independent air chamber group, which consists of the first type of air chambers, the second regulating dampers of different independent air chambers are arranged on the same side of the partition plate.

7. A boiler control method, characterized in that, The method, applied to the boiler control system according to any one of claims 1-6, comprises: The differential pressure between the secondary air box and the furnace, the control coefficients for the flame temperature index in the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field are obtained. An automatic control curve is generated based on the differential pressure between the secondary air box and the furnace, the control coefficients for the flame temperature index in the combustion zone, the control coefficients for the nitrogen oxide index, the control coefficients for the reducing atmosphere of the water-cooled wall surface, the control coefficients for the metal wall temperature of the heated surface, and the control coefficients for the tangential circle of the aerodynamic field. The aerodynamic field tangent of the boiler is controlled according to the automatic control curve.

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