Device and method for automatically adjusting over fire air of opposed firing boiler

Abstract

The embodiment of the invention provides an automatic over-fire air adjusting device and method for an opposed firing boiler, and the device comprises an over-fire air box which is arranged at an inlet of a flue in a hearth of the firing boiler, an over-fire air nozzle which is arranged in the over-fire air box, and a flow adjusting part which is arranged at an air inlet of the over-fire air nozzle; the carbon monoxide concentration detection equipment is arranged at an outlet of the flue in the hearth; the heat exchanger is arranged upwards along the flow direction of the flue gas in the hearth and is arranged between the inlet and the outlet of the flue; the temperature detection equipment is arranged on the outer wall of the heat exchanger; the control device is electrically connected with the carbon monoxide concentration detection equipment, the temperature detection equipment and the flow adjusting part and is used for controlling the flow adjusting part according to the comparison between the actual carbon monoxide concentration value detected by the carbon monoxide concentration detection equipment and the preset carbon monoxide concentration value; or the control device controls the flow adjusting piece to adjust the air supply amount of the over fire air nozzle according to the comparison between the actual wall temperature value detected by the temperature detection equipment and the preset wall temperature value.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of thermal power unit equipment, and specifically relate to an automatic adjustment device and method for burnout air of a counter-combustion boiler. Background Art

[0002] As the energy conservation and carbon reduction work of thermal power units is further promoted, the requirements for the operating parameters of coal-fired boilers are becoming increasingly stringent. In order to reduce the coal consumption of the unit, it is usually necessary for the boiler to operate with oxygen content and steam temperature that reach or even exceed the design value. Under such strict operating conditions, it is very important to fine-tune the optimization and adjustment of the boiler, and the burnout air is one of the key means of boiler combustion adjustment.

[0003] At present, a large number of scholars and practitioners at home and abroad have conducted research on overburnt air adjustment and found that the overburnt air adjustment of hedge combustion boilers has a significant impact on key parameters such as boiler combustion deviation, wall temperature, and CO concentration. In the combustion adjustment test, reasonable adjustment of the overburnt air is beneficial to improve combustion uniformity, reduce local wall temperature high points and CO high points, and improve boiler operation safety and economy.

[0004] However, currently, the adjustment of the overburnt air, especially the adjustment of the overburnt air lever, can only be done manually, and it is fixed in a certain position according to the test conclusion and remains unchanged in daily operation. In fact, the combustion state of the boiler varies greatly under different loads, different grinding combinations, different coal qualities, etc. The current manual overburnt air adjustment mode is difficult to adapt to the flexible operation mode of thermal power units. When the combustion conditions change, the overburnt air cannot change accordingly, which leads to problems such as overheating of the boiler and reduced combustion efficiency. Summary of the invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a device and method for automatically adjusting the burnout air of a counter-combustion boiler.

[0006] A first aspect of an embodiment of the present disclosure provides an automatic adjustment device for overburnt air of a counter-combustion boiler, comprising:

[0007] A burnout wind box is arranged at the inlet of the flue in the furnace of the combustion boiler, wherein the burnout wind box is provided with a burnout air nozzle, and a flow regulating member is arranged at the air inlet of the burnout air nozzle, wherein the flow regulating member is used to adjust the air supply volume of the burnout air nozzle;

[0008] The carbon monoxide concentration detection device is installed at the outlet of the flue in the furnace to detect the carbon monoxide concentration in the flue gas;

[0009] The heat exchanger is arranged along the flow direction of the flue gas in the furnace and is set between the inlet and outlet of the flue to absorb the heat in the flue gas;

[0010] A temperature detection device, disposed on the outer wall of the heat exchanger, for detecting the wall temperature of the heat exchanger;

[0011] A control device is electrically connected to the carbon monoxide concentration detection device, the temperature detection device and the flow regulating member, respectively. The control device controls the flow regulating member to adjust the air supply of the burnout air nozzle according to a comparison between an actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device and a preset value of the carbon monoxide concentration; or the control device controls the flow regulating member to adjust the air supply of the burnout air nozzle according to a comparison between an actual value of the wall temperature detected by the temperature detection device and a preset value of the wall temperature.

[0012] Optionally, there are a plurality of overburnt air nozzles, and the plurality of overburnt air nozzles are arranged at intervals along the width direction of the furnace; there are a plurality of flow regulating members, and the plurality of flow regulating members are arranged in one-to-one correspondence with the plurality of overburnt air nozzles;

[0013] There are multiple carbon monoxide concentration detection devices and multiple temperature detection devices;

[0014] Among them, multiple burnout air areas are arranged in the width direction of the furnace, each burnout air area includes a burnout air nozzle, and along the burnout air flow direction sprayed from the burnout air nozzle, at least one temperature detection device and a carbon monoxide concentration detection device are sequentially arranged.

[0015] A second aspect of the embodiments of the present disclosure provides a method for automatically adjusting the over-burning air of a counter-fired boiler. The method is implemented according to the above-mentioned automatic over-burning air adjustment device for a counter-fired boiler, and includes:

[0016] Detect the actual value of carbon monoxide concentration in the flue gas of each overburnt air area in the boiler flue;

[0017] Detecting the actual value of the wall temperature of the heat exchanger in each overburnt air area in the boiler flue;

[0018] According to the comparison result of the actual wall temperature detected by the temperature detection device and the preset wall temperature value, or according to the comparison result of the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value, the flow adjustment component is controlled to adjust the air supply volume of the burnout air nozzle.

[0019] Optionally, according to a comparison result that an actual wall temperature detected by the temperature detection device is higher than a preset wall temperature value, the opening of the flow regulating member is increased to increase the air supply volume of the overburnt air nozzle.

[0020] Optionally, after increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes:

[0021] Detecting the actual value of the wall temperature of the heat exchanger in the overburnt air area after increasing the opening of the flow regulating member;

[0022] According to the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member in the overburnt air area except the overburnt air area is reduced.

[0023] Optionally, according to a comparison result that an actual value of carbon monoxide concentration detected by the carbon monoxide detection device is higher than a preset value of carbon monoxide concentration, the opening of the flow regulating member is increased to increase the air supply volume of the overburnt air nozzle.

[0024] Furthermore, after increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes:

[0025] Detecting the actual value of the carbon monoxide concentration in the flue gas in the overburnt air area after increasing the opening of the flow regulating member;

[0026] According to the comparison result that the actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset value of the carbon monoxide concentration, the opening of the flow regulating member in the overburnt air area except the overburnt air area is reduced.

[0027] Furthermore, it also includes: detecting the actual value of the wall temperature of the heat exchanger in the burnout air area; and adjusting the opening of the flow regulating component according to the actual value of the wall temperature, based on the comparison result that the actual value of the wall temperature detected by the temperature detection device is higher than the preset value of the wall temperature.

[0028] The beneficial effects of the embodiments of the present disclosure include:

[0029] In the present disclosure, by detecting the carbon monoxide concentration in the flue gas and automatically adjusting the supply volume of the burnout air according to the comparison between the actual value of the carbon monoxide concentration and the preset value, the incompletely burned fuel can be effectively reduced and the combustion efficiency can be improved. By detecting the wall temperature of the heat exchanger and automatically adjusting the supply volume of the burnout air according to the comparison between the actual value of the wall temperature and the preset value, local overheating and pipe explosion can be prevented, thereby improving the safety of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an automatic over-burning air regulating device for a counter-combustion boiler according to an embodiment of the present disclosure;

[0031] Figure 2 The present invention is a flow chart of a method for automatically adjusting the overburnt air of a hedge combustion boiler according to another embodiment of the present invention.

[0032] In the figure, 1. burnout air nozzle; 2. heat exchanger; 3. economizer outlet; 5. furnace; 6. burnout wind box; 21. screen superheater; 22. high-temperature superheater; 23. high-temperature reheater. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] like Figure 1 As shown, an automatic regulation device and method for the burnout air of a counter-combustion boiler is provided, wherein a burnout wind box is arranged at the inlet of the flue in the furnace 5 of the combustion boiler, a burnout air nozzle 1 is arranged in the burnout wind box 6, and a flow regulating member is arranged at the air inlet of the burnout air nozzle, and the flow regulating member is used to adjust the air supply volume of the burnout air nozzle.

[0037] The carbon monoxide concentration detection device is set at the outlet of the flue in the furnace 5 ( Figure 1 The heat exchanger is arranged along the flow direction of the flue gas in the furnace and is set between the inlet and outlet of the flue to absorb the heat in the flue gas. The temperature detection device is set on the outer wall of the heat exchanger 2 to detect the wall temperature of the heat exchanger.

[0038] The control device is electrically connected to the carbon monoxide concentration detection device, the temperature detection device and the flow adjustment member respectively, and the control device controls the flow adjustment member to adjust the air supply volume of the burnout air nozzle according to the comparison between the actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset value of the carbon monoxide concentration. Or the control device controls the flow adjustment member to adjust the air supply volume of the burnout air nozzle according to the comparison between the actual value of the wall temperature detected by the temperature detection device and the preset value of the wall temperature.

[0039] In the present disclosure, by detecting the carbon monoxide concentration in the flue gas and automatically adjusting the supply volume of the overburnt air according to the comparison between the actual value of the carbon monoxide concentration and the preset value, the incompletely burned fuel can be effectively reduced and the combustion efficiency can be improved. By detecting the wall temperature of the heat exchanger and automatically adjusting the supply volume of the overburnt air according to the comparison between the actual value of the wall temperature and the preset value, local overheating and pipe burst can be prevented and the safety of the heat exchanger can be improved. In some embodiments, the heat exchanger includes a screen superheater 21, a high-temperature superheater 22 and a high-temperature reheater 23 arranged in sequence along the flow direction of the flue gas in the furnace.

[0040] In some embodiments, the carbon monoxide concentration detection device is a CO online measuring instrument.

[0041] In some embodiments, the flow regulating member is a burnout air volume regulating rod.

[0042] In some embodiments, there are multiple overburnt air nozzles, and the multiple overburnt air nozzles are arranged at intervals along the width direction of the furnace. There are multiple flow regulating members, and the multiple flow regulating members are arranged one-to-one corresponding to the multiple overburnt air nozzles. There are multiple carbon monoxide concentration detection devices and multiple temperature detection devices.

[0043] Among them, multiple burnout air areas are arranged in the width direction of the furnace, each burnout air area includes a burnout air nozzle, and along the burnout air flow direction sprayed from the burnout air nozzle, at least one temperature detection device and a carbon monoxide concentration detection device are sequentially arranged.

[0044] In the present disclosure, multiple overburnt air zones are arranged in the width direction of the furnace, and each zone is equipped with an independent overburnt air nozzle, flow adjustment member, temperature detection device and carbon monoxide concentration detection device, so that fine control of each zone can be achieved. Each overburnt air zone can be independently adjusted according to its own temperature and carbon monoxide concentration, avoiding the imbalance problem caused by global adjustment and improving the uniformity and efficiency of overall combustion.

[0045] Furthermore, through multi-point detection and local adjustment, the combustion conditions of each area can be controlled more accurately, reducing incompletely burned fuel and improving combustion efficiency. And the flow adjustment parts of each area can be dynamically adjusted according to real-time detection data to ensure that the combustion conditions of each area are always in the best state.

[0046] like Figure 2 As shown, the second aspect of the embodiment of the present disclosure provides a method for automatically adjusting the over-burning air of a hedge combustion boiler. The adjustment method is implemented according to the above-mentioned automatic adjustment device for over-burning air of a hedge combustion boiler, and includes:

[0047] S101. Detect the actual value of the carbon monoxide concentration in the flue gas of each overburnt air area in the boiler flue.

[0048] S102. Detect the actual value of the wall temperature of each over-combustion air area heat exchanger in the boiler flue.

[0049] S103, controlling the flow regulating component to regulate the air supply of the burnout air nozzle according to the comparison result of the actual wall temperature detected by the temperature detecting device with the preset wall temperature value, or according to the comparison result of the actual carbon monoxide concentration detected by the carbon monoxide concentration detecting device with the preset carbon monoxide concentration value.

[0050] In the present disclosure, by detecting the carbon monoxide concentration in the flue gas of each overburnt air zone and the wall temperature of the heat exchanger, and making local adjustments based on the detection results, it is possible to achieve refined control of each zone and improve combustion efficiency. Each overburnt air zone can be independently adjusted according to its own temperature and carbon monoxide concentration, avoiding the imbalance problem caused by global adjustment and ensuring that the combustion conditions of each zone are always in the best state.

[0051] The wall temperature of each area can be monitored in real time by independent temperature detection equipment, and the air supply volume of the burnout air can be adjusted in time to prevent equipment damage caused by local overheating.

[0052] In some embodiments, according to the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member is increased to increase the air supply volume of the burnout air nozzle.

[0053] In the present disclosure, by real-time monitoring of the wall temperature and quickly increasing the opening of the flow regulating member according to the comparison result of the actual wall temperature value and the preset value, the temperature change can be quickly responded to to ensure that the combustion process is always in the best state. By increasing the air supply volume of the burnout air, the wall temperature can be effectively reduced to ensure the safety of the equipment, and the complete combustion of the fuel can be promoted, the combustion efficiency can be improved, and the incompletely burned fuel can be reduced.

[0054] In some embodiments, after increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes:

[0055] After the opening of the flow regulating element is increased, the actual value of the wall temperature of the heat exchanger in the burnout air area is detected.

[0056] According to the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member in the burnout air area except the burnout air area is reduced.

[0057] In the present disclosure, by adjusting the opening of a flow regulating member in a certain overburnt air area and detecting the carbon monoxide concentration in the area, it is possible to ensure that the combustion conditions in the area are optimized and the combustion efficiency is improved. By adjusting the opening of the flow regulating member in other overburnt air areas, the relative air intake volume of the overburnt air area can be increased, the temperature of the flue gas can be effectively reduced, thereby reducing the wall temperature and ensuring the safety of the equipment.

[0058] In some embodiments, according to the comparison result that the actual value of the carbon monoxide concentration detected by the carbon monoxide detection device is higher than the preset value of the carbon monoxide concentration, the opening of the flow regulating member is increased to increase the air supply volume of the burnout air nozzle.

[0059] In the present disclosure, by real-time monitoring of the carbon monoxide concentration and rapidly increasing the opening of the flow regulating member according to the comparison result between the actual value and the preset value, it is possible to quickly respond to the situation of insufficient combustion and ensure that the combustion process is always in the best state. By increasing the air supply volume of the burnout air, it is possible to promote the complete combustion of the fuel, reduce the incompletely burned fuel, and improve the combustion efficiency.

[0060] Furthermore, by increasing the supply volume of the overburnt air, the concentration of carbon monoxide in the flue gas can be effectively reduced, the emission of harmful gases can be reduced, and the environmental performance can be improved. The reduction in carbon monoxide concentration means that the combustion is more complete, the products of incomplete combustion are reduced, and the generation of other harmful substances is further reduced.

[0061] In some embodiments, after increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes:

[0062] After the flow regulating element is opened, the actual value of the carbon monoxide concentration in the flue gas in the burnout air area is detected;

[0063] According to the comparison result that the actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset value of the carbon monoxide concentration, the opening of the flow regulating member in the burnout air area except the burnout air area is reduced.

[0064] In the present disclosure, by adjusting the opening of a flow regulating member in a certain overburned air region and detecting the carbon monoxide concentration in the region, it is possible to ensure that the combustion conditions in the region are optimized and the combustion efficiency is improved. By adjusting the opening of the flow regulating member in other overburned air regions, the relative air intake volume of the overburned air region can be increased, thereby ensuring sufficient combustion in the overburned air region and reducing the generation of incomplete combustion products and other harmful substances.

[0065] In some embodiments, the method further includes: detecting an actual value of the wall temperature of the heat exchanger in the overfire air area.

[0066] According to the comparison result that the actual wall temperature value detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member is adjusted preferentially according to the actual wall temperature value.

[0067] In the present disclosure, equipment safety has a higher priority than environmental safety, that is, the wall temperature regulation mode has a higher priority than the carbon monoxide regulation mode.

[0068] A specific example provided by the present disclosure includes:

[0069] like Figure 1 As shown, Figure 1 In order to offset the combustion of boiler flue gas from the overburnt air nozzle to the economizer outlet, 1 to N overburnt air areas are arranged from side A to side B in the furnace width direction. Each overburnt air area corresponds to an overburnt air nozzle and an economizer outlet. A series of heat exchangers (including screen superheaters, high-temperature superheaters and high-temperature reheaters) are located downstream of the overburnt air nozzles, and the flue at the furnace outlet is divided into two flues, side A and side B, after passing through the economizer.

[0070] In the disclosed scheme, in order to accurately grasp the CO concentration generated by coal powder combustion, a CO online measuring instrument is set at the location of the economizer outlet flue, as shown in the attached Figure 1 As shown, the number of CO online measuring instruments is the same as the number N of single-layer overburnt air outlets, and their arrangement positions in the flue width direction correspond one to one with the positions of the overburnt air in the furnace width direction.

[0071] According to the arrangement positions of the overburnt air nozzles, the screen superheater, high temperature superheater and high temperature reheater are divided into N overburnt air areas in the width direction with the center lines of adjacent overburnt air nozzles as dividing lines.

[0072] The regulating device disclosed in the present invention includes a wall temperature priority regulating mode: the maximum allowable temperature of the platen superheater, high temperature superheater and high temperature reheater tube wall is recorded as Tmax. When the tube wall temperature (actual value of the wall temperature) of the platen superheater, high temperature superheater and high temperature reheater in the overburning air area Ni exceeds Tmax (preset value of the wall temperature), for the safety of unit operation, the regulating device will give priority to regulating the wall temperature. The adjustment method is as follows:

[0073] 1) Based on the control of the control device, the burnout air volume adjustment lever in the Ni burnout air area is opened, and if the wall temperature drops below Tmax, the adjustment is stopped. 2) If the wall temperature (actual wall temperature value) is still higher than Tmax (preset wall temperature value) after the burnout air volume adjustment lever is opened to 100% in the Ni burnout air area, then based on the control of the control device, the burnout air volume adjustment levers other than the Ni burnout air are closed until the wall temperature drops below Tmax, and the adjustment lower limit is 30%.

[0074] CO priority regulation mode: When the tube wall temperature (actual wall temperature value) of the screen superheater, high temperature superheater and high temperature reheater in the overburnt air area Ni does not exceed Tmax (preset wall temperature value), the regulating device will give priority to regulating the CO concentration at the economizer outlet to improve the thermal efficiency of boiler combustion. According to the CO instrument data at the economizer outlet, the high CO concentration area is determined. Assuming that the CO concentration in the overburnt air area Ni is the highest, the regulation method is similar to the wall temperature condition method, as follows:

[0075] 1) Based on the control of the control device, the burnout air volume adjustment lever in the burnout air area Ni is opened. If the CO concentration (actual value of carbon monoxide concentration) drops to a value lower than the carbon monoxide concentration value (preset value of carbon monoxide concentration) in other burnout air areas, the adjustment is stopped; 2) If the CO concentration is still higher than that in other areas after the burnout air volume adjustment lever in the burnout air area Ni is opened to 100%, based on the control of the control device, the burnout air volume adjustment levers in other areas except the burnout air area Ni are closed until the CO concentration drops to a value lower than that in other areas, and the lower limit of the adjustment is 30%; 3) During the CO concentration adjustment process, when the wall temperature exceeds Tmax, the adjustment mode returns to the wall temperature priority adjustment mode.

[0076] According to a third aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored.

[0077] When the computer program is executed by the processor, it can implement the above-mentioned method for automatically adjusting the overburnt air of a hedge combustion boiler.

[0078] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An automatic regulating device for burnout air of a counter-fired boiler, characterized in that: include: A burnout wind box is arranged at the inlet of the flue in the furnace of the combustion boiler, wherein the burnout wind box is provided with a burnout air nozzle, and a flow regulating member is arranged at the air inlet of the burnout air nozzle, wherein the flow regulating member is used to adjust the air supply volume of the burnout air nozzle; The carbon monoxide concentration detection device is installed at the outlet of the flue in the furnace to detect the carbon monoxide concentration in the flue gas; The heat exchanger is arranged along the flow direction of the flue gas in the furnace and is set between the inlet and outlet of the flue to absorb the heat in the flue gas; A temperature detection device, disposed on the outer wall of the heat exchanger, for detecting the wall temperature of the heat exchanger; A control device is electrically connected to the carbon monoxide concentration detection device, the temperature detection device and the flow regulating member, respectively. The control device controls the flow regulating member to adjust the air supply of the burnout air nozzle according to a comparison between an actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device and a preset value of the carbon monoxide concentration; or the control device controls the flow regulating member to adjust the air supply of the burnout air nozzle according to a comparison between an actual value of the wall temperature detected by the temperature detection device and a preset value of the wall temperature.

2. The automatic overburning air regulating device for a counter-firing boiler according to claim 1 is characterized in that: There are a plurality of overburnt air nozzles, and the plurality of overburnt air nozzles are arranged at intervals along the width direction of the furnace; there are a plurality of flow regulating members, and the plurality of flow regulating members are arranged in one-to-one correspondence with the plurality of overburnt air nozzles; There are multiple carbon monoxide concentration detection devices and multiple temperature detection devices; Among them, multiple burnout air areas are arranged in the width direction of the furnace, and each burnout air area includes a burnout air nozzle, and at least one temperature detection device and a carbon monoxide concentration detection device are sequentially arranged along the burnout air flow direction sprayed from the burnout air nozzle.

3. A method for automatically adjusting the overburnt air of a counter-fired boiler, the method being implemented according to the device for automatically adjusting the overburnt air of a counter-fired boiler according to claim 1 or 2, characterized in that: include: Detect the actual value of carbon monoxide concentration in the flue gas of each overburnt air area in the boiler flue; Detecting the actual value of the wall temperature of the heat exchanger in each overburnt air area in the boiler flue; According to the comparison result of the actual wall temperature detected by the temperature detection device and the preset wall temperature value, or according to the comparison result of the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value, the flow adjustment component is controlled to adjust the air supply volume of the burnout air nozzle.

4. The method for automatically adjusting the overburnt air of a counter-firing boiler according to claim 3 is characterized in that: According to the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member is increased to increase the air supply volume of the overburnt air nozzle.

5. The method for automatically adjusting the overburnt air of a counter-fired boiler according to claim 4, characterized in that: After increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes: Detecting the actual value of the wall temperature of the heat exchanger in the overburnt air area after increasing the opening of the flow regulating member; According to the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, the opening of the flow regulating member in the overburnt air area except the overburnt air area is reduced.

6. The method for automatically adjusting the overburnt air of a counter-fired boiler according to claim 3, characterized in that: According to the comparison result that the actual value of the carbon monoxide concentration detected by the carbon monoxide detection device is higher than the preset value of the carbon monoxide concentration, the opening of the flow regulating member is increased to increase the air supply volume of the burnout air nozzle.

7. The method for automatically adjusting the overburnt air of a counter-fired boiler according to claim 6, characterized in that: After increasing the opening of the flow regulating member to increase the air supply volume of the overburnt air nozzle, the method further includes: Detecting the actual value of the carbon monoxide concentration in the flue gas in the overburnt air area after increasing the opening of the flow regulating member; According to the comparison result that the actual value of the carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset value of the carbon monoxide concentration, the opening of the flow regulating member in the overburnt air area except the overburnt air area is reduced.

8. The method for automatically adjusting the overburnt air of a counter-firing boiler according to claim 6, characterized in that: Also includes: Detect the actual value of the wall temperature of the heat exchanger in the burnout air area; based on the comparison result that the actual value of the wall temperature detected by the temperature detection device is higher than the preset value of the wall temperature, preferentially adjust the opening of the flow regulating member according to the actual value of the wall temperature.

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