A boiler burnout air regulating device and method

Abstract

This disclosure provides a boiler burnout air regulating device and method. The device includes: a burnout air box disposed at the inlet of the flue in the furnace of a combustion boiler, the burnout air box having an even number of burnout air nozzles, a baffle plate, and a flow regulating component disposed at the air inlet of the burnout air nozzles; a carbon monoxide concentration detection device disposed at the outlet of the flue in the furnace; a heat exchanger arranged along the flow direction of the flue gas in the furnace and disposed between the inlet and outlet of the flue; a temperature detection device disposed on the outer wall of the heat exchanger; and a control device electrically connected to the carbon monoxide concentration detection device, the temperature detection device, and the flow regulating component. The control device controls the flow regulating component to adjust the air volume delivered by the burnout air nozzles based on a comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and a preset carbon monoxide concentration value, or based on a comparison between the actual wall temperature detected by the temperature detection device and a preset wall temperature value.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of thermal power unit equipment, specifically relating to a boiler burnout air regulating device and method. Background Technology

[0002] As energy conservation and carbon reduction efforts in thermal power units deepen, the requirements for operating parameters of coal-fired boilers are becoming increasingly stringent. To reduce unit coal consumption, boiler oxygen levels and steam temperatures typically need to reach or exceed design values. Under these stringent operating conditions, precise optimization and adjustment of the boiler are crucial, with burnout air serving as a key means of adjusting boiler combustion.

[0003] Currently, numerous scholars and practitioners both domestically and internationally have conducted research on burnout air adjustment. They have found that burnout air adjustment in counter-firing boilers has a significant impact on key parameters such as boiler combustion deviation, wall temperature, and CO concentration. In combustion adjustment tests, reasonable adjustment of burnout air can help improve combustion uniformity, reduce local high wall temperature and CO high points, and improve boiler operation safety and economy.

[0004] However, currently, the adjustment of the burnout air, especially the adjustment of the burnout air lever, can only be done manually. Based on experimental results, it is fixed at a certain position and remains unchanged during daily operation. In reality, the boiler combustion state varies greatly under different loads, mill combinations, and coal qualities. The current manual adjustment mode of the burnout air is difficult to adapt to the flexible operation of thermal power units. When combustion conditions change, the burnout air cannot follow suit, leading to problems such as boiler overheating and reduced combustion efficiency. Summary of the Invention

[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a boiler burnout air regulating device and method.

[0006] A first aspect of the embodiments of this disclosure provides a boiler burnout air regulating device, comprising:

[0007] A burnout air box is installed at the inlet of the flue inside the furnace of a combustion boiler. The burnout air box is equipped with an even number of burnout air nozzles, a baffle, and a flow regulating component installed at the air inlet of the burnout air nozzle. The flow regulating component is used to adjust the air volume supplied by the burnout air nozzle. The baffle is located at the symmetrical center of the even number of burnout air nozzles to define a first side and a second side inside the burnout air box. The air inlet flow regulating component is correspondingly installed on the first side and the second side of the burnout air box.

[0008] Multiple carbon monoxide concentration detection devices are installed at the outlet of the flue inside the furnace. Each of the multiple carbon monoxide concentration detection devices is corresponding to an even number of burnout air nozzles and is used 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 located between the inlet and outlet of the flue gas to absorb heat from the flue gas.

[0010] Multiple temperature detection devices are installed on the outer wall of the heat exchanger, and each of the multiple temperature detection devices is corresponding to an even number of burnout air nozzles to detect the wall temperature of the heat exchanger; wherein, the furnace is divided into multiple burnout air zones in the width direction, each burnout air zone includes a burnout air nozzle, and at least one temperature detection device and one carbon monoxide concentration detection device are sequentially installed along the burnout air flow sprayed from the burnout air nozzle;

[0011] The control device is electrically connected to the carbon monoxide concentration detection device, the temperature detection device, and the flow regulator, respectively. The control device controls the flow regulator to adjust the air volume of the burnout air nozzle based on the comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value; or the control device controls the flow regulator to adjust the air volume of the burnout air nozzle based on the comparison between the actual wall temperature detected by the temperature detection device and the preset wall temperature value.

[0012] A second aspect of the embodiments of this disclosure provides a boiler burnout air regulation method, the regulation method being implemented according to the boiler burnout air regulation device described above, comprising:

[0013] Detect the actual carbon monoxide concentration in the flue gas of each burnout air zone inside the boiler flue.

[0014] Detect the actual wall temperature of the heat exchanger in each burnout air zone within the boiler flue.

[0015] Based on the comparison between the actual wall temperature value detected by the temperature detection device and the preset wall temperature value, or based on the comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value, the flow regulating component is controlled to adjust the air volume of the burnout air nozzle.

[0016] Optionally, based on 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 component is increased to increase the air volume delivered by the burnout air nozzle.

[0017] Optionally, the partition divides the burnout air box into a first side and a second side separated by phases; wherein, it further includes:

[0018] The actual wall temperature of the heat exchanger in the burnout air area on the first or second side is detected after the opening of the flow regulating component is increased.

[0019] Based on 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 component in the burnout air area other than the burnout air area on the first or second side is reduced.

[0020] Optional, also includes:

[0021] After the opening of the flow regulating component in the burnout air area (excluding the burnout air area) on the first or second side is reduced, the actual wall temperature of the heat exchanger in the burnout air area on the first or second side is detected.

[0022] Based on 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 air inlet flow rate regulating component of the burnout air box on the second side or the first side is reduced, or the opening of the air inlet flow rate regulating component of the burnout air box on the first side or the second side is increased.

[0023] Optionally, based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide detection device is higher than the preset carbon monoxide concentration, the opening of the flow regulating component is increased to increase the air volume delivered by the burnout air nozzle.

[0024] Furthermore, the partition divides the burnout air box into a first side and a second side separated by phases; wherein, it also includes:

[0025] The actual carbon monoxide concentration in the flue gas within the burnout air zone on the first or second side is detected after the opening of the flow regulator is increased.

[0026] Based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset carbon monoxide concentration, the opening of the flow regulating component in the burnout air area other than the burnout air area on the first or second side is reduced.

[0027] Furthermore, it also includes:

[0028] After the opening of the flow regulator in the burnout air area (excluding the burnout air area) on the first or second side is reduced, the actual value of carbon monoxide concentration in the flue gas in the burnout air area on the first or second side is detected.

[0029] Based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset carbon monoxide concentration, the opening of the air inlet flow rate regulating component of the burnout air box on the second side or the first side is adjusted to be reduced, or the opening of the air inlet flow rate regulating component of the burnout air box on the first side or the second side is increased.

[0030] Furthermore, it also includes: detecting the actual wall temperature of the heat exchanger in the burnout air area; and, based on the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value, adjusting the opening of the flow regulating component according to the actual wall temperature value first.

[0031] The beneficial effects of the embodiments of this disclosure include:

[0032] In this disclosure, by detecting the carbon monoxide concentration in the flue gas and automatically adjusting the burnout air volume based on the comparison between the actual and preset carbon monoxide concentration, the amount of incompletely burned fuel can be effectively reduced, thus improving combustion efficiency. By detecting the heat exchanger wall temperature and automatically adjusting the burnout air volume based on the comparison between the actual and preset wall temperature, localized overheating and tube rupture can be prevented, improving the safety of the heat exchanger. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a boiler burnout air regulating device according to an embodiment of the present disclosure;

[0034] Figure 2 This is a schematic flowchart of a boiler burnout air regulation method according to another embodiment of the present disclosure.

[0035] In the diagram, 1 is the burnout air nozzle; 2 is the heat exchanger; 3 is the economizer outlet; 4 is the baffle plate; 5 is the furnace; 6 is the burnout air box; 21 is the screen-type superheater; 22 is the high-temperature superheater; and 23 is the high-temperature reheater. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0039] like Figure 1 As shown, a boiler burnout air regulating device and method includes a burnout air box 6, located at the inlet of the flue inside the furnace 5 of a combustion boiler. The burnout air box 6 contains an even number of burnout air nozzles 1, a baffle 4, and flow regulating components at the air inlets of the burnout air nozzles. The flow regulating components are used to regulate the air volume supplied by the burnout air nozzles. The baffle 4 is positioned at the symmetrical center of the even number of burnout air nozzles to define a first side and a second side within the burnout air box 6. Correspondingly, air inlet flow regulating components are installed on the first and second sides of the burnout air box to regulate the airflow within the first and second sides of the burnout air box.

[0040] Multiple carbon monoxide concentration detection devices are installed at the outlet of the flue inside furnace 5. Figure 1 At the economizer outlet 3), multiple carbon monoxide concentration detection devices are installed in a one-to-one correspondence with an even number of burnout air nozzles to detect the carbon monoxide concentration in the flue gas. A heat exchanger is arranged along the flow direction of the flue gas within the furnace and positioned between the flue gas inlet and outlet to absorb heat from the flue gas. Multiple temperature detection devices are installed on the outer wall of the heat exchanger 2, each corresponding to an even number of burnout air nozzles, to detect the wall temperature of the heat exchanger. The furnace is divided into multiple burnout air zones along its width. Each burnout air zone includes a burnout air nozzle, and along the burnout air flow direction emitted from that nozzle, at least one temperature detection device and one carbon monoxide concentration detection device are sequentially installed.

[0041] The control device is electrically connected to a carbon monoxide concentration detection device, a temperature detection device, and a flow regulator. Based on a comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and a preset carbon monoxide concentration value, the control device controls the flow regulator to adjust the airflow from the burnout air nozzle. Alternatively, based on a comparison between the actual wall temperature detected by the temperature detection device and a preset wall temperature value, the control device controls the flow regulator to adjust the airflow from the burnout air nozzle.

[0042] In this disclosure, by detecting the carbon monoxide concentration in the flue gas and automatically adjusting the burnout air volume based on a comparison between the actual and preset carbon monoxide concentration, unburned fuel can be effectively reduced, thus improving combustion efficiency. By detecting the heat exchanger wall temperature and automatically adjusting the burnout air volume based on a comparison between the actual and preset wall temperature, localized overheating and tube rupture can be prevented, improving the heat exchanger's safety. In some embodiments, the heat exchanger includes a screen-type superheater 21, a high-temperature superheater 22, and a high-temperature reheater 23 arranged sequentially along the flue gas flow direction within the furnace.

[0043] In some embodiments, the carbon monoxide concentration detection device is an online CO measurement instrument.

[0044] In some embodiments, the flow rate regulator is a burnout air volume regulating lever.

[0045] In some embodiments, there are multiple burnout air nozzles, spaced apart along the width of the furnace. There are also multiple flow regulators, each corresponding to one of the multiple burnout air nozzles. Multiple carbon monoxide concentration detectors and multiple temperature detectors are also included.

[0046] The furnace contains multiple burnout air zones arranged in the width direction. Each burnout air zone includes a burnout air nozzle and a temperature detection device and a carbon monoxide concentration detection device arranged sequentially along the burnout air flow sprayed from the nozzle.

[0047] In this disclosure, by arranging multiple burnout air zones along the width of the furnace, each zone is equipped with an independent burnout air nozzle, flow regulator, temperature detection device, and carbon monoxide concentration detection device, enabling precise control of each zone. Each burnout air zone can be independently adjusted according to its own temperature and carbon monoxide concentration, avoiding the imbalance problems caused by global adjustment and improving the overall combustion uniformity and efficiency.

[0048] Furthermore, through multi-point detection and local adjustment, combustion conditions in each zone can be controlled more accurately, reducing incomplete combustion of fuel and improving combustion efficiency. Moreover, the flow regulators in each zone can be dynamically adjusted based on real-time detection data, ensuring that combustion conditions in each zone are always at their optimal state.

[0049] Specifically, there is an even number of burnout air nozzles, spaced evenly along the width of the furnace. Multiple flow regulators are present, each corresponding to one of the burnout air nozzles. Multiple carbon monoxide concentration detectors and multiple temperature detectors are also present. A baffle is also installed inside the burnout air box, positioned symmetrically at the center of the even number of burnout air nozzles.

[0050] The furnace contains multiple burnout air zones arranged in the width direction. Each burnout air zone includes a burnout air nozzle and at least one temperature detection device and one carbon monoxide concentration detection device are sequentially installed along the burnout air flow sprayed from the nozzle.

[0051] In this disclosure, by arranging multiple burnout air zones along the width of the furnace, each zone is equipped with an independent burnout air nozzle, flow regulator, temperature detection device, and carbon monoxide concentration detection device, enabling precise control of each zone and improving combustion efficiency. Each burnout air zone can be independently adjusted according to its own temperature and carbon monoxide concentration, avoiding the imbalance problems caused by global adjustment and ensuring that the combustion conditions in each zone are always at their optimal state.

[0052] Furthermore, the airflow enters the burnout air nozzle from the burnout air box. For an even number of burnout air nozzles, a baffle can be set in the middle of the air box. In this way, by adjusting the opening of the burnout air layer damper, the overall air intake volume of the left / right burnout air can be changed.

[0053] like Figure 2 As shown, a second aspect of the embodiments of this disclosure provides a boiler burnout air regulation method, the regulation method being implemented according to the above-described boiler burnout air regulation device, comprising:

[0054] S101. Detect the actual carbon monoxide concentration in the flue gas of each burnout air zone in the boiler flue.

[0055] S102. Detect the actual wall temperature of the heat exchanger in each burnout air zone inside the boiler flue.

[0056] S103. Based on the comparison between the actual wall temperature value detected by the temperature detection device and the preset wall temperature value, or based on the comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value, control the flow regulating component to adjust the air supply volume of the burnout air nozzle.

[0057] In this disclosure, by detecting the carbon monoxide concentration in the flue gas and the wall temperature of the heat exchanger in each burnout air zone, and making local adjustments based on the detection results, precise control of each zone can be achieved, thereby improving combustion efficiency. Each burnout air zone can be independently adjusted according to its own temperature and carbon monoxide concentration, avoiding the imbalance problems caused by global adjustment and ensuring that the combustion conditions in each zone are always at their optimal state.

[0058] The wall temperature in each area can be monitored in real time by an independent temperature detection device, allowing for timely adjustment of the burnout air supply to prevent equipment damage caused by localized overheating.

[0059] In some embodiments, based on the comparison results of the actual wall temperature value detected by the temperature detection device being higher than the preset wall temperature value, the opening of the flow regulating component is increased to increase the air volume delivered by the burnout air nozzle.

[0060] In this disclosure, by real-time monitoring of the wall temperature and comparing the actual wall temperature with the preset value, the opening of the flow regulator is rapidly increased, enabling a quick response to temperature changes and ensuring that the combustion process is always in optimal condition. By increasing the air volume of the burnout air, the wall temperature can be effectively reduced, ensuring the safety of the equipment. In addition, it can also promote complete combustion of fuel, improve combustion efficiency, and reduce unburned fuel.

[0061] In some embodiments, a partition divides the burnout bellows into a first side and a second side separated by phases; wherein, it further includes:

[0062] The actual wall temperature of the heat exchanger in the burnout air zone on the first or second side is measured after the opening of the flow rate regulator is increased.

[0063] Based on the comparison results of the actual wall temperature value detected by the temperature detection equipment being higher than the preset wall temperature value, the opening of the flow regulating component in the burnout air area outside the burnout air area on the first or second side is reduced.

[0064] In this disclosure, by reducing the opening of the flow regulating element in the burnout air area (excluding the burnout air area) on the first or second side, the relative air intake in the burnout air area can be increased, thereby effectively cooling the heat exchanger in the burnout air area.

[0065] In some embodiments, it also includes:

[0066] After adjusting the opening of the flow regulator in the burnout air area (excluding the burnout air area) on the first or second side, the actual wall temperature of the heat exchanger in the burnout air area on the first or second side is detected.

[0067] Based on the comparison results of the actual wall temperature value detected by the temperature detection equipment being higher than the preset wall temperature value, the opening degree of the air inlet flow rate regulator of the burnout air box on the second side or the first side is reduced, or the opening degree of the air inlet flow rate regulator of the burnout air box on the first side or the second side is increased.

[0068] In this disclosure, by reducing the opening of the air inlet flow rate regulating component of the burnout air box on the second side or the first side, or by increasing the opening of the air inlet flow rate regulating component of the burnout air box on the first side or the second side, the relative air volume in all burnout air areas within the first side or the second side can be increased, thereby enabling effective cooling of the heat exchanger in the burnout air area.

[0069] In some embodiments, based on the comparison results of the actual carbon monoxide concentration detected by the carbon monoxide detection device being higher than the preset carbon monoxide concentration, the opening of the flow regulating component is increased to increase the air volume delivered by the burnout air nozzle.

[0070] In this disclosure, by real-time monitoring of carbon monoxide concentration and rapidly increasing the opening of the flow regulator based on the comparison between the actual and preset values, incomplete combustion can be quickly addressed, ensuring that the combustion process is always in optimal condition. Increasing the supply air volume of the burnout air promotes complete combustion of fuel, reduces unburned fuel, and improves combustion efficiency.

[0071] In some embodiments, a partition divides the burnout bellows into a first side and a second side separated by phases; wherein, it further includes:

[0072] The actual carbon monoxide concentration in the flue gas within the burnout air zone on the first or second side is measured after the opening of the flow regulator is increased.

[0073] Based on the comparison results of the actual carbon monoxide concentration detected by the carbon monoxide concentration detection equipment being higher than the preset carbon monoxide concentration value, the opening of the flow regulating component in the burnout air area outside the burnout air area on the first or second side is reduced.

[0074] In this disclosure, by reducing the opening of the flow regulator in the burnout air zones (excluding the burnout air zone) on the first or second side, the relative air intake within those zones can be increased. This promotes complete fuel combustion, reduces incompletely burned fuel, and improves combustion efficiency. Specifically, by increasing the opening of the flow regulator in a particular burnout air zone and then monitoring the carbon monoxide concentration in that zone, combustion conditions in that zone can be optimized, improving combustion efficiency. Conversely, by reducing the opening of the flow regulators in other burnout air zones, the relative air intake within those zones can be increased, effectively reducing the flue gas temperature and consequently lowering the wall temperature, ensuring the safety of the equipment.

[0075] In some embodiments, it also includes:

[0076] After adjusting the opening of the flow regulator in the burnout air area (excluding the burnout air area) on the first or second side, the actual carbon monoxide concentration in the flue gas within that burnout air area on the first or second side is detected.

[0077] Based on the comparison results of the actual carbon monoxide concentration detected by the carbon monoxide concentration detection equipment being higher than the preset carbon monoxide concentration value, adjust the opening of the air inlet flow regulator of the burnout air box on the second or first side to be smaller, or increase the opening of the air inlet flow regulator of the burnout air box on the first or second side to be larger.

[0078] In this disclosure, by adjusting the opening of the inlet airflow regulator of the burnout air box on the second or first side, or by increasing the opening of the inlet airflow regulator of the burnout air box on the first or second side, the relative airflow in all burnout air zones within the first or second side can be increased. This promotes complete combustion of fuel within the burnout air zone, reduces incompletely burned fuel, and improves combustion efficiency. Furthermore, by increasing the supply airflow of the burnout air, the concentration of carbon monoxide in the flue gas can be effectively reduced, reducing the emission of harmful gases and improving environmental performance. The reduction in carbon monoxide concentration means more complete combustion, reducing incompletely burned products, and further reducing the formation of other harmful substances.

[0079] In this disclosure, by increasing the opening of the flow regulator in a certain burnout air zone and then detecting the carbon monoxide concentration in that zone, the combustion conditions in that zone can be optimized, thus improving combustion efficiency. By decreasing the opening of the flow regulators in other burnout air zones, the relative air intake in that burnout air zone can be increased, thereby ensuring complete combustion in that burnout air zone and reducing the generation of incomplete combustion products and other harmful substances.

[0080] In some embodiments, the method further includes: detecting the actual wall temperature of the heat exchanger in the burnout air area; and adjusting the opening of the flow regulating component based on the actual wall temperature detected by the temperature detection device as a priority, based on the comparison result that the actual wall temperature detected by the temperature detection device is higher than the preset wall temperature value.

[0081] In this disclosure, equipment safety priority is higher than environmental priority, that is, the wall temperature regulation mode is higher than the carbon monoxide regulation mode.

[0082] One specific example provided in this disclosure includes:

[0083] like Figure 1 As shown, Figure 1 The diagram shows the flue gas flow path from the burnout air nozzle to the economizer outlet of the offset combustion boiler. There are 1 to N burnout air zones arranged from side A to side B in the width direction of the furnace. Each burnout air zone corresponds to a burnout air nozzle and an economizer outlet. Downstream of the burnout air nozzle is a series of heat exchangers (including screen-type superheaters, high-temperature superheaters and high-temperature reheaters). After passing through the economizer, the flue gas at the furnace outlet is divided into two flues, side A and side B.

[0084] In this disclosed scheme, in order to accurately determine the CO concentration generated during pulverized coal combustion, an online CO measuring instrument is installed at the economizer outlet flue, as shown in the attached diagram. Figure 1 As shown, the number of CO online measuring instruments is the same as the number N of single-layer burnout air outlets, and their arrangement in the flue width direction corresponds one-to-one with the burnout air position in the furnace width direction.

[0085] Based on the arrangement of the burnout air nozzles, and using the center line of adjacent burnout air nozzles as the dividing line, the screen-type superheater, high-temperature superheater, and high-temperature reheater are divided into N burnout air zones in the width direction.

[0086] The regulating device disclosed herein includes a wall temperature priority regulation mode: the maximum allowable wall temperature of the screen-type superheater, high-temperature superheater, and high-temperature reheater is denoted as Tmax. When the wall temperature (actual wall temperature) of the screen-type superheater, high-temperature superheater, and high-temperature reheater in the burnout air zone Ni exceeds Tmax (preset wall temperature value), the regulating device will prioritize regulating the wall temperature for unit operation safety. The adjustment method is as follows:

[0087] 1) Based on the control of the control device, open the burnout air volume adjustment lever in the Ni burnout air area. If the wall temperature drops below Tmax, stop the adjustment; 2) If the wall temperature is still higher than Tmax after the burnout air volume adjustment lever in the Ni burnout air area is opened to 100%, then based on the control of the control device, close the burnout air volume adjustment levers in other burnout air areas located on the same side, excluding the Ni burnout air area. Specifically, when Ni≤N / 2, close the [1,Ni) and (Ni,N / 2] burnout air volume adjustment levers; when Ni>N / 2, close the (N / 2,Ni) and (Ni,N) burnout air volume adjustment levers until the wall temperature drops below Tmax, with the lower limit of adjustment being 30%; 3) If the wall temperature is still too high after adjustment in step b, increase the opening of the burnout air box inlet flow rate adjustment component on the side where the Ni burnout air area is located, or decrease the opening of the burnout air box inlet flow rate adjustment component on the other side, until the wall temperature drops below Tmax, with the opening adjustment range being 20%~100%.

[0088] CO Priority Adjustment Mode: When the wall temperature (actual wall temperature) of the screen-type superheater, high-temperature superheater, and high-temperature reheater does not exceed Tmax (preset wall temperature) in the burnout air zone Ni, the regulating device will prioritize adjusting the CO concentration at the economizer outlet to improve boiler combustion thermal efficiency. Based on the economizer outlet CO instrument data, the high CO concentration zone is determined. Assuming the highest CO concentration is found in the burnout air zone Ni, the adjustment method is similar to the wall temperature condition method, as follows:

[0089] 1) Based on the control device, the burnout air volume adjustment lever in burnout air zone Ni is opened wider. If the CO concentration (actual value of carbon monoxide concentration) drops below the carbon monoxide concentration value (preset value of carbon monoxide concentration) of other burnout air zones, the adjustment is stopped; 2) If, based on the control device, the CO concentration is still higher than other zones after the burnout air volume adjustment lever in burnout air zone Ni is opened to 100%, the burnout air volume adjustment levers of other burnout air zones located on the same side, excluding burnout air zone Ni, are closed based on the control device. Specifically, when Ni≤N / 2, the burnout air volume adjustment levers of the [1,Ni) and (Ni,N / 2] burnout air zones are closed; when Ni>N / 2, the burnout air volume adjustment levers of the (N / 2,Ni) and (Ni,N) burnout air zones are closed until the CO concentration is lower than that of other zones, with an adjustment limit of 30%; 3) If the CO concentration is still too high after adjustment in step b, the opening of the burnout air box inlet flow rate adjustment component on the Ni side is increased, or the opening of the burnout air box inlet flow rate adjustment component on the other side is decreased, based on the control of the control device, until the CO concentration is lower than that of other zones, with an opening adjustment range of 20%~100%.

[0090] 3) If the wall temperature exceeds Tmax during the CO concentration adjustment process, return to the wall temperature priority adjustment mode.

[0091] A third aspect of the embodiments of this disclosure provides a computer-readable storage medium having a computer program stored thereon.

[0092] When a computer program is executed by a processor, it can implement a boiler burnout air regulation method as described above.

[0093] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A boiler burnout air regulating device, characterized in that, include: A burnout air box is installed at the inlet of the flue inside the furnace of a combustion boiler. The burnout air box is equipped with an even number of burnout air nozzles, a baffle, and a flow regulating component installed at the air inlet of the burnout air nozzle. The flow regulating component is used to adjust the air volume supplied by the burnout air nozzle. The baffle is located at the symmetrical center of the even number of burnout air nozzles to define a first side and a second side inside the burnout air box. The air inlet flow regulating component is correspondingly installed on the first side and the second side of the burnout air box. Multiple carbon monoxide concentration detection devices are installed at the outlet of the flue inside the furnace. Each of the multiple carbon monoxide concentration detection devices is corresponding to an even number of burnout air nozzles and is used 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 located between the inlet and outlet of the flue gas to absorb heat from the flue gas. Multiple temperature detection devices are installed on the outer wall of the heat exchanger, and each of the multiple temperature detection devices is corresponding to an even number of burnout air nozzles to detect the wall temperature of the heat exchanger; wherein, the furnace is divided into multiple burnout air zones in the width direction, each burnout air zone includes a burnout air nozzle, and at least one of the temperature detection devices and one of the carbon monoxide concentration detection devices are sequentially installed along the burnout air flow sprayed from the burnout air nozzle; A control device is electrically connected to the carbon monoxide concentration detection device, the temperature detection device, and the flow regulator, respectively. The control device controls the flow regulator to adjust the air volume of the burnout air nozzle based on a comparison between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and a preset carbon monoxide concentration value; or the control device controls the flow regulator to adjust the air volume of the burnout air nozzle based on a comparison between the actual wall temperature detected by the temperature detection device and a preset wall temperature value. The control device is configured to prioritize the wall temperature adjustment mode when the actual wall temperature detected by the temperature detection device exceeds the preset wall temperature value, and to prioritize the carbon monoxide adjustment mode when the actual wall temperature is lower than the preset wall temperature value.

2. A method for regulating boiler burnout air, wherein the method is implemented according to the boiler burnout air regulating device according to claim 1, characterized in that, include: Detect the actual carbon monoxide concentration in the flue gas of each burnout air zone inside the boiler flue. Detect the actual wall temperature of the heat exchanger in each burnout air zone within the boiler flue. Based on the comparison result between the actual wall temperature value detected by the temperature detection device and the preset wall temperature value, or based on the comparison result between the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device and the preset carbon monoxide concentration value, the flow regulating component is controlled to adjust the air volume of the burnout air nozzle; wherein, the control device is configured to prioritize the activation of the wall temperature priority adjustment mode when the actual wall temperature value detected by the temperature detection device exceeds the preset wall temperature value, and to activate the carbon monoxide priority adjustment mode when the actual wall temperature value is lower than the preset wall temperature value.

3. The boiler burnout air regulation method according to claim 2, characterized in that, Based on the comparison result of the actual wall temperature value detected by the temperature detection device being higher than the preset wall temperature value, the opening of the flow regulating component is increased to increase the air volume delivered by the burnout air nozzle.

4. The boiler burnout air regulation method according to claim 3, characterized in that, The partition divides the burnout air box into a first side and a second side separated by phases; wherein, it also includes: The actual wall temperature of the heat exchanger in the burnout air area on the first or second side is detected after the opening of the flow regulating component is increased. Based on 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 component in the burnout air area other than the burnout air area on the first or second side is reduced.

5. A boiler burnout air regulation method according to claim 4, characterized in that, Also includes: After the opening of the flow regulating component in the burnout air area (excluding the burnout air area) on the first or second side is reduced, the actual wall temperature of the heat exchanger in the burnout air area on the first or second side is detected. Based on 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 air inlet flow rate regulating component of the burnout air box on the second side or the first side is reduced, or the opening of the air inlet flow rate regulating component of the burnout air box on the first side or the second side is increased.

6. A boiler burnout air regulation method according to claim 2, characterized in that, Based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset carbon monoxide concentration, the opening of the flow regulating component is increased to increase the air volume delivered by the burnout air nozzle.

7. A boiler burnout air regulation method according to claim 6, characterized in that, The partition divides the burnout air box into a first side and a second side separated by phases; wherein, it also includes: The actual carbon monoxide concentration in the flue gas within the burnout air zone on the first or second side is detected after the opening of the flow regulator is increased. Based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset carbon monoxide concentration, the opening of the flow regulating component in the burnout air area other than the burnout air area on the first or second side is reduced.

8. A boiler burnout air regulation method according to claim 7, characterized in that, Also includes: After the opening of the flow regulator in the burnout air area (excluding the burnout air area) on the first or second side is reduced, the actual value of carbon monoxide concentration in the flue gas in the burnout air area on the first or second side is detected. Based on the comparison result that the actual carbon monoxide concentration detected by the carbon monoxide concentration detection device is higher than the preset carbon monoxide concentration, the opening of the air inlet flow rate regulating component of the burnout air box on the second side or the first side is adjusted to be reduced, or the opening of the air inlet flow rate regulating component of the burnout air box on the first side or the second side is increased.

9. A boiler burnout air regulation method according to claim 7, characterized in that, Also includes: Detect the actual wall temperature of the heat exchanger in the burnout air zone; Based on the comparison result of the actual wall temperature value detected by the temperature detection device being higher than the preset wall temperature value, the opening degree of the flow regulating component is adjusted according to the actual wall temperature value.

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