Intelligent control method of corner tangential combustion boiler for low-load combustion of thermal power generating unit, tangential combustion boiler, electronic equipment and storage medium

Abstract

The invention relates to the technical field of intelligent control of four-corner tangential combustion boilers, in particular to an intelligent control method of a four-corner tangential combustion boiler for low-load combustion of a thermal power generating unit, which comprises the following steps of: acquiring a coal ash weight average value of four coal ash gathering discs, and when the coal ash weight average value is within a first range value, controlling the four coal ash gathering discs to be in a second range value; obtaining again after a second preset duration according to the first control signal; when the average value of the stored powder weight is within a second range value, four electric air pumps are synchronously controlled according to the second control signal to conduct direct-current air injection on the central axis of the rotating flame in the hearth at the pressure of the first pressure value; and when the average value of the stored powder weight is within a third range value, synchronously controlling the four electric air pumps to perform direct-current air injection to the central axis of the rotating flame in the hearth at the pressure of the second pressure value according to the third control signal. According to the scheme provided by the invention, the unburnt or inadequately burnt pulverized coal mixture can be heated, burnt again and utilized, so that the utilization efficiency of energy is improved.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for tangential combustion boilers, and in particular to an intelligent control method for a tangential combustion boiler used in thermal power units under low load, a tangential combustion boiler, electronic equipment, and a storage medium. Background Technology

[0002] Thermal power generation refers to the core method of power generation that converts the heat energy generated by the combustion of combustibles into electrical energy through a power generation device. A thermal power generation device consists of a boiler, a steam turbine, and a generator. The boiler generates electricity by burning fuels such as coal and oil to produce steam, which in turn drives the turbine to rotate. The turbine then drives the generator to produce electrical energy. The core components of a thermal power generation device include a boiler, a steam turbine, and a generator. Among these, the tangential boiler is one of the most widely used devices in large-scale thermal power generation, employing coal-fired boiler combustion technology, which involves evenly distributing the combustion energy through the four walls of the furnace. Multiple sets of burners (generally direct-flow burners) are arranged to form a rotating flame through the interaction of airflow at the four corners, enhancing the turbulent mixing effect. During the start-up phase, the furnace purging and auxiliary system commissioning of the tangential combustion boiler must be completed first. The ignition process adopts a two-stage ignition mode. First, the ignition oil gun is ignited by a high-energy igniter to form a stable oil flame. Then, the oil flame heats the pulverized coal conveyed by the primary air. After the pulverized coal reaches the ignition temperature and forms a stable flame, the oil gun is gradually withdrawn. At the same time, the primary air-coal airflow is injected through the nozzles of the four corner burners at an angle of 15° to 30° to establish a rotating tangential circle in the center of the furnace, thereby achieving continuous combustion.

[0003] When burning a mixture (i.e., a mixture of coal and other substances) in a tangential combustion boiler, a staged air distribution technology is often employed (i.e., the required materials are delivered to the tangential boiler through primary, secondary, and tertiary air). Primary air is used to input pulverized coal and some oxygen; secondary air is used to supplement oxygen and assist in mixing the pulverized coal with oxygen; and tertiary air is used to blow pulverized coal scattered on the burner wall into the furnace. During operation, combustion stability is maintained through air-to-coal ratio regulation, furnace temperature control, furnace micro-negative pressure management, and burner nozzle angle adjustment. Finally, the combustion products (such as slag and dust) are processed through heat exchange, purification, and recovery. The exhaust gas after combustion undergoes heat exchange and emission. However, after the combustion in the tangential combustion boiler reaches a relatively stable state, in order to ensure the normal operation of the tangential combustion boiler while maintaining steam-driven turbine power generation and minimizing pulverized coal consumption, operators often set the tangential combustion boiler to low-load operation. This results in the primary air-coal jet of the once-through burner being injected into the furnace from the primary air nozzle during low-load combustion. Within the furnace, ignition and heating are only provided by the high-temperature flue gas drawn in from the outside of the jet, leading to a stable ignition point at the burner nozzle outlet. Ignition can only occur at the edge of the primary air-coal jet, leading to a near-zero velocity gradient at the outer boundary of the free jet, resulting in almost no turbulent disturbance and poor heat and mass transfer. Simultaneously, the jet expands outward after leaving the nozzle, and the coal particles within it concentrate on the inner side due to inertia. Therefore, for the coal particles on the inner side to obtain heat for combustion, they must first heat the outer air before heating the inner coal particles. This results in poor ignition conditions for the jet formed by a single-stream burner, requiring reliance on the flame at the upstream corner for stable combustion. Furthermore, the reduced coal injection rate also lowers the load within the boiler. The temperature drops, and the rotation intensity of the fireball in the furnace also weakens, leading to a decrease in furnace temperature. In order to maintain the necessary coal powder mixture conveying speed, the coal powder concentration in the primary air will be greatly reduced, and the secondary air speed will also decrease accordingly. As a result, some of the coal powder on the outside of the primary air coal jet may not burn completely or may not burn at all. This can cause the incompletely burned or completely unburned coal powder in the furnace to drift to various places in the furnace (such as drifting to the inner wall of the furnace, falling to the dust collection section at the bottom of the boiler, and drifting to the boiler exhaust port), ultimately resulting in the waste of coal powder and its inability to be fully utilized.

[0004] Furthermore, in the actual combustion process of tangential combustion boilers, problems such as imbalanced air-fuel ratio, abnormal drop in flame temperature, obstructed flue gas passages, and uneven mixing of fuel and air can easily lead to incomplete combustion of pulverized coal. This not only significantly reduces the utilization rate of coal energy and increases power generation costs, but also poses safety hazards due to the accumulation of unburned pulverized coal in the furnace or flue. At the same time, incomplete combustion leads to increased emissions of pollutants such as carbon monoxide and hydrocarbons in the flue gas, resulting in exhaust emissions that do not meet environmental protection requirements. Therefore, real-time and accurate monitoring of the boiler combustion status and timely identification of incomplete combustion problems are also important aspects of ensuring the safe, efficient, and environmentally friendly operation of thermal power plants.

[0005] Therefore, how to intelligently control the combustion of incompletely burned or completely unburned pulverized coal in a tangential combustion boiler is a technical problem that technicians need to solve. Summary of the Invention

[0006] To overcome the problems existing in related technologies, this application provides an intelligent control method for a tangential combustion boiler for low-load combustion in thermal power units, a tangential combustion boiler, electronic equipment, and a storage medium. This intelligent control method for a tangential combustion boiler can directly blow all the coal powder mixture accumulated on the coal ash collection plate to the rotating flame burning inside the furnace, thereby heating and re-combusting and utilizing the unburned or incompletely burned coal powder mixture, preventing the waste of incompletely burned or completely unburned coal powder, improving energy utilization efficiency, and ultimately increasing the power generation rate of thermal power generation.

[0007] To achieve the above objectives, this application provides, in its first aspect, an intelligent control method for a tangential combustion boiler used in thermal power units under low-load combustion, comprising: Step S1: Obtain the coal ash weight values ​​of the four coal ash collection pans respectively, and calculate the average of the four coal ash weight values ​​to obtain the average coal ash weight; wherein, the four coal ash collection pans are located at the bottom of the DC burner of the four-corner tangential combustion boiler; Step S2: When the average weight of the stored powder is within the first range, a first control signal is issued, and step S1 is executed again after a second preset time according to the first control signal. Step S3: When the average weight of the stored powder is within the second range, a second control signal is issued, and four electric air pumps are synchronously controlled to spray air directly into the rotating flame center axis inside the furnace at a pressure of the first pressure value according to the second control signal. Step S4: When the average weight of the stored powder is within the third range, a third control signal is issued, and four electric air pumps are synchronously controlled to spray air directly into the center axis of the rotating flame inside the furnace at the pressure of the second pressure value according to the third control signal. Among them, the maximum value of the first range value is less than the minimum value of the second range value, the maximum value of the second range value is less than the minimum value of the third range value, the first pressure value and the second pressure value are in a functional relationship, and the angle formed by the axis of the DC jet and the primary air jet axis of the DC burner is an acute angle.

[0008] In one implementation method, before obtaining the coal ash weight values ​​of the four coal ash collection pans respectively, the method includes: After the DC burner is ignited and burned, every first preset time interval, the total weight of all the pulverized coal input into the furnace by the DC burner within the first preset time interval is extracted, and the total weight of the slag that falls into the bottom of the furnace within the first preset time interval is obtained. Calculate the ratio of the weight of the coal slag to the weight of the coal powder to obtain the coal powder combustion ratio; Determine whether the pulverized coal combustion ratio is less than the preset combustion ratio; If so, proceed to step S1.

[0009] In one implementation, after step S3, in which four electric air pumps are synchronously controlled according to the second control signal to inject direct current air into the rotating flame center axis inside the furnace at a pressure of a first pressure value, the method further includes: After a third preset duration, a first stop signal is issued, wherein the third preset duration is less than the second preset duration; Based on the first stop signal, the four electric air pumps are synchronously controlled to stop DC jetting and step S1 is executed.

[0010] In one implementation, after step S3, in which four electric air pumps are synchronously controlled according to the second control signal to directly inject air into the rotating flame center axis inside the furnace at a pressure of a first pressure value, step S4 further includes: After the fourth preset duration, a second stop signal is issued; According to the second stop signal, the four electric air pumps are synchronously controlled to stop DC jetting and step S1 is executed; wherein the third preset duration is less than the fourth preset duration, and the third preset duration and the fourth preset duration are in a functional relationship.

[0011] In one implementation method, the functional relationship between the first pressure value and the second pressure value is as follows: P1 = P2 * (L1 / L2 + m1 / M); In the formula, P1 represents the first pressure value, P2 represents the second pressure value, L1 represents the vertical distance from the direct current burner nozzle to the axis of the rotating flame center, L2 represents the straight-line distance from the starting point of the direct current jet nozzle to the intersection point of the direct current jet axis and the primary air jet axis, m1 represents the maximum value within the second range, and M represents the maximum value within the third range.

[0012] In a first aspect, this application provides a tangential combustion boiler for applying the intelligent control method for a four-corner tangential combustion boiler as described above, comprising: a four-corner boiler body and a DC burner, wherein the four-corner boiler body includes a furnace and four furnace walls, and the DC burner is respectively disposed at the intersection of two adjacent furnace walls; The bottom of the DC burner is equipped with a coal ash collection plate, and the bottom of the furnace is equipped with a coal slag recovery plate. The coal slag recovery plate is used to recover the coal powder mixture after combustion, and the coal ash collection plate is used to collect unburned or incompletely burned coal powder. It also includes an electric air pump, the suction end of which is connected to the interior of the four-corner boiler body, and the jet end of which is used to blow the coal powder mixture accumulated on the coal ash collection plate toward the rotating flame inside the furnace.

[0013] Preferably, a coal ash ejection structure is provided below the coal ash collecting plate. The coal ash ejection structure includes a coal ash nozzle, a spherical cavity and a conical nozzle. The coal ash collecting plate is a funnel-shaped collecting plate. The smaller end of the conical nozzle is connected to the coal ash nozzle, and the larger end of the conical nozzle is connected to the spherical cavity; the top of the spherical cavity is connected to the center of the coal ash collecting plate through a conduit. The jet end of the electric air pump is connected to the spherical cavity, and the connection between the electric air pump and the spherical cavity is aligned with the port of the larger end of the conical nozzle; wherein, the jet direction of the coal ash nozzle is aligned with the central axis of the rotating flame.

[0014] Preferably, all four sides of the furnace wall are provided with a coal ash guiding structure, which includes a first guide bar and a second guide bar. Both the first guide bar and the second guide bar are provided with a channeling groove, and the groove surface of the channeling groove faces the top of the furnace. In each furnace wall, the beginning of the first guide strip is connected to the beginning of the second guide strip. The end of the first guide strip is located above the coal ash collection plate on one side of the furnace wall, and the end of the second guide strip is located above the coal ash collection plate on the other side of the furnace wall. The connection point between the first guide strip and the second guide strip is higher than the position of the coal ash collection plate, and the angle formed by the first guide strip and the second guide strip is an obtuse angle.

[0015] A third aspect of this application provides an electronic device, comprising: Processor; and The memory stores executable code, which, when executed by the processor, causes the processor to perform the intelligent control method for a tangential combustion boiler as described above.

[0016] The fourth aspect of this application provides a non-transitory machine-readable storage medium having executable code stored thereon, which, when executed by a processor of an electronic device, causes the processor to execute the intelligent control method for a tangential combustion boiler as described in any of the preceding claims.

[0017] The technical solution provided in this application may include the following beneficial effects: In this technical solution, intelligent control is performed on a tangential combustion boiler undergoing low-load combustion. In this example, the weight of coal ash is acquired from four coal ash collection trays (located at the bottom of the DC burners of the tangential combustion boiler), and the average weight of the four coal ash weights is calculated. Based on the magnitude of the average coal ash weight, the weight of unburned or incompletely burned coal powder mixture accumulated in the tangential combustion boiler is determined. If the average weight of the accumulated coal powder is within a first range, it indicates that the unburned or incompletely burned coal powder in the boiler does not currently need to be cleaned or recycled. It also indicates that the amount of coal powder mixture falling into the tangential combustion boiler is not yet sufficient. Therefore, after a second preset time interval, the average weight of coal ash on the four coal ash collection trays is acquired and calculated again. The average weight of the accumulated coal powder must be within a second or third range, where the maximum value of the first range is less than the minimum value of the second range, and the maximum value of the second range is less than the minimum value of the third range. If the minimum value of the circumference is reached, it is determined that there is enough pulverized coal mixture falling into the tangential combustion boiler and it should be cleaned up in time. Based on the weight of the pulverized coal mixture, a second or third control signal is issued in time. Based on the second or third control signal, using the acute angle formed by the axis of the DC jet and the primary air jet axis of the DC burner, four electric air pumps are simultaneously controlled to perform DC jet injection. This allows the DC jets from the electric air pumps to blow all the pulverized coal mixture accumulated on the coal ash collection plate directly into the rotating flame burning inside the furnace (where the temperature is higher and it is easier for the pulverized coal to reach the ignition point). This heats up and re-burns the unburned or incompletely burned pulverized coal mixture, and further reuses the unburned or incompletely burned pulverized coal mixture that has drifted onto the inner wall, preventing the waste of incompletely burned or completely unburned pulverized coal, further improving energy utilization efficiency, and ultimately increasing the power generation rate of thermal power generation.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0020] Figure 1 This is a schematic flowchart illustrating the intelligent control method for a four-corner tangential combustion boiler according to an embodiment of this application; Figure 2 This is a top cross-sectional view of a tangentially circular combustion boiler shown in an embodiment of this application; Figure 3 This is a schematic diagram of the wall structure of a tangential combustion boiler shown in an embodiment of this application; Figure 4 This is a cross-sectional view of the coal ash ejection structure shown in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of an electronic device shown in an embodiment of this application.

[0021] Figure label: Four-corner boiler body 10, furnace 11, furnace wall 12, direct current burner 20, coal ash collecting plate 30, electric air pump 50, coal ash spraying structure 60, coal ash nozzle 61, spherical cavity 62, conical spray pipe 63, coal ash guiding structure 70, first guide bar 71, second guide bar 72, and diversion channel 73. Detailed Implementation

[0022] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] In the description of this application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0026] In the description of this application, it should 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings. Example

[0028] To address the aforementioned technical problems, this embodiment provides an intelligent control method for a tangential combustion boiler used in thermal power units under low-load combustion.

[0029] The technical solution will be described in detail below with reference to the accompanying drawings.

[0030] This embodiment provides an intelligent control method for a tangential combustion boiler used in low-load combustion of thermal power units, including: Step S1: Obtain the coal ash weight values ​​of the four coal ash collection pans respectively, and calculate the average of the four coal ash weight values ​​to obtain the average coal ash weight; wherein, the four coal ash collection pans are located at the bottom of the DC burners of the four-corner tangential combustion boiler; It should be noted that this embodiment collects the pulverized coal that fails to ignite in time due to low boiler load and replenishes it to maintain stable combustion. Since collecting the missed pulverized coal takes time, continuously blowing it into the furnace would affect the stable combustion of the flame and, due to the small amount of coal blown in, would not significantly contribute to stable combustion. Therefore, this step obtains the average ash weight by acquiring the total mass of ash from four ash collection pans and calculating the average of the four ash weights.

[0031] The coal ash collection trays are used to collect the coal powder mixture that falls or is not fully burned from the nozzles of the DC burners during low-load combustion. The four collection trays correspond symmetrically to the four sets of DC burners at the four corners of the boiler. The coal ash collection trays can be fan-shaped or funnel-shaped; the specific shape is not limited. The coal powder weight value refers to the weight of the coal powder or coal powder mixture accumulated in a single coal ash collection tray, reflecting the local accumulation of incompletely burned coal powder during low-load combustion. This value can be obtained by installing a weight detector on the coal ash collection tray. The average coal powder weight is the arithmetic mean of the weight values ​​from the four coal ash collection trays. This is because, in actual operation, the weight of coal powder collected by each collector may vary slightly, but all four collectors blow the coal powder into the furnace simultaneously. Therefore, calculating the average coal powder weight improves control accuracy. In addition, the four pulverized coal ash collection trays are located at the bottom of the direct-current burners of the four-corner tangential combustion boiler. The pulverized coal ash collection trays are mainly used to collect leaked coal. The leakage is mainly due to insufficient air force, coarse coal powder, or excessively high coal powder moisture during the coal feeding process. Under the influence of gravity, the coal powder does not have enough force to rush towards the imaginary tangential circle of the furnace and thus falls downward. Therefore, setting the pulverized coal ash collection trays at the bottom of the direct-current burners of the four-corner tangential combustion boiler can effectively catch the leaked coal powder.

[0032] It is worth noting that in existing technologies, coal dust leaking from a DC burner during coal blowing typically falls into a slag pit along with coal ash. This slag is then treated using methods such as dry or wet slag treatment, and the coal dust mixed with the ash is extracted and reused. Unlike existing technologies, this solution collects the leaked coal dust promptly and subsequently blows it into the furnace for combustion. This method eliminates the need for further coal dust extraction, saving resources. Furthermore, the leaked coal dust has already undergone grinding, drying, and heating, eliminating the need for additional pretreatment before being fed into the furnace.

[0033] Preferably, in actual operation, when the combustion efficiency is low, replenishing the leaked coal into the furnace can effectively solve the problem of low combustion efficiency. Therefore, the preferred embodiment of this case, before obtaining the ash weight values ​​of the four ash collection pans, further includes: after the DC burner is ignited, every first preset time interval, extracting the total weight of all the pulverized coal input into the furnace by the DC burner within that first preset time interval, and obtaining the total weight of the slag that falls to the bottom of the furnace within that first preset time interval; calculating the ratio of the slag weight value to the pulverized coal weight value to obtain the pulverized coal combustion ratio; determining whether the pulverized coal combustion ratio is less than a preset combustion ratio; if so, then proceeding to step S1. It should be noted that this preferred embodiment, by setting a pre-program before step S1, enables timely replenishment of ash when the combustion efficiency is low. Specifically, the first preset duration refers to the periodic triggering time interval after the DC burners have stabilized at ignition. It is set based on the stability characteristics of low-load combustion. Since the combustion state changes slowly under low load, an excessively long duration may miss early detection of incomplete combustion, while an excessively short duration will result in invalid data collection and increase system load. For example, for a 300MW unit, the time is 60 minutes when the load rate is 30%~40%, and 30 minutes when the load rate is 40%~50%. The total weight of pulverized coal refers to the total mass of pulverized coal transported to the furnace by the four DC burners via primary air within the first preset duration, reflecting the total fuel input value during that period. The total weight of slag refers to the total weight of post-combustion solid residue collected in the coal recovery pan at the bottom of the furnace within the first preset duration, including fully combusted ash and incompletely combusted semi-coke particles. The pulverized coal combustion ratio is the ratio of the total weight of slag to the total weight of pulverized coal, which reflects combustion efficiency. The preset combustion ratio is a pre-set critical value for determining combustion efficiency, determined by the specific conditions of the boiler. When the pulverized coal combustion ratio is less than the preset combustion ratio, it means that the combustion efficiency in the boiler has not reached the predetermined standard. The combustion efficiency can be improved by supplementing the pulverized coal in the furnace through S1 and subsequent steps.

[0034] Step S2: When the average weight of the stored powder is within the first range, a first control signal is issued, and step S1 is executed again after a second preset time according to the first control signal. It should be noted that, as mentioned above, if the coal powder in the coal ash collection pan is too light, it will not produce a beneficial effect when blown into the furnace. Therefore, this step is a judgment step to determine whether the coal powder collected in the coal powder collection pan meets the standard. By comparing the obtained average coal powder weight with a preset threshold, when the average coal powder weight is within the first range, a first control signal is issued, and step S1 is executed again after a second preset time according to the first control signal.

[0035] The first range value refers to a pre-set weight interval for determining the amount of unburned pulverized coal accumulation without intervention. It is determined based on the pulverized coal consumption rate, furnace volume, and safe accumulation threshold of unburned pulverized coal under low-load combustion. For example, when the boiler is a 300MW tangential boiler, the first range value can be 0-0.5kg. The first control signal is a delayed retest command issued by the system when the average weight of the stored pulverized coal falls within the first range value. This command triggers a second preset time interval to re-execute step S1, rather than starting the electric air pump to release gas. The first control signal can be an electrical signal, used to control the boiler through the control system, or a mechanical signal, directly controlling the corresponding switches. The second preset time interval is the time interval between delays in re-executing step S1 after the first control signal is triggered. This time interval is adjusted according to the low-load combustion intensity, generally between 10-25 minutes. Since ash collection takes time, frequent or continuous measurements are meaningless and would increase control costs.

[0036] Step S3: When the average weight of stored powder is within the second range, a second control signal is issued, and four electric air pumps are synchronously controlled to spray air directly into the rotating flame center axis inside the furnace at a pressure of the first pressure value according to the second control signal. It should be noted that this embodiment achieves efficient coal powder recovery by blowing the coal ash collected in the coal ash collector into the furnace for secondary combustion. Simultaneously, the pressure of the electric air pump needs to be controlled. On one hand, the air pump pressure must be sufficient to blow the coal ash into the furnace to prevent secondary fall; on the other hand, the air pump pressure must not be too high to prevent disturbance to the flame combustion within the furnace. Since the coal ash weight obtained in this embodiment is measured at intervals rather than continuously, the average calculated coal ash weight value fluctuates significantly. Different pressures are required for blowing at different coal ash weight values. However, repeated pressure changes can disturb the flame and affect its stability within the furnace. Therefore, this embodiment uses a graded control of the electric air pump pressure based on the average coal powder weight, specifically divided into two levels: step S3 is the first level, and step S4 is the second level.

[0037] Specifically, step S3 involves performing secondary combustion on the accumulated pulverized coal. When the average weight of the accumulated pulverized coal falls within a second range, a second control signal is issued. Based on this signal, four electric air pumps are synchronously controlled to inject direct current air into the rotating flame's central axis within the furnace at a pressure of a first pressure value. The second range refers to a pre-defined weight interval used to determine when intervention is needed to assess the amount of unburned pulverized coal accumulated. This range is determined based on the pulverized coal consumption rate under low-load combustion, the furnace volume, and the safe accumulation threshold for unburned pulverized coal. For example, for a 300MW unit, the second range threshold is 0.5-1.5 kg. It is important to note that the value of the second range must satisfy the condition that the maximum value of the first range is less than the minimum value of the second range to ensure the uniqueness of the accumulation determination; otherwise, it could lead to confusion caused by multiple commands. The second control signal is the instruction sent to the electric air pump control system when the average coal weight falls within the second range. This second control signal is a mixed digital and analog signal. The digital signal triggers the air pump to start, while the analog signal is a first pressure value parameter determined based on parameters such as the average coal ash weight and the vertical distance from the DC burner nozzle to the rotating flame center axis. This ensures the air pump can perform pressure control at the first pressure value. The first pressure value refers to the electric air pump's jet pressure specified in the second control signal. Because the weight of coal ash blown into the furnace and the required distance vary, the air pump cannot use a fixed pressure for jetting; it must be adjusted according to the specific situation. The rotating flame center axis inside the furnace refers to the geometric center axis of the rotating flame formed by the airflow from the four sets of DC burner nozzles in the furnace of a tangentially circular combustion boiler. It is usually located at the center of the furnace cross-section. The jetting must be aligned with this axis to ensure that the pulverized coal is blown into the high-temperature flame core area for complete combustion. The acute angle between the DC jet and the primary air jet axis refers to the angle between the axis of the electric air pump jet and the axis of the DC burner primary air jet. This angle allows the jet airflow and the primary airflow to work in tandem, avoiding disturbance to flame stability, while ensuring that unburned coal powder is efficiently entrained into the rotating flame.

[0038] It is worth noting that in this embodiment, the electric air pumps distributed next to the four coal ash collection pans need to inject air into the furnace at the same first pressure value. This is because the tangential boiler maintains the stability of tangential combustion by using the same axial force at the four corners. If each electric air pump provides different airflow at different pressure values, it is easy to cause the center of the illusory tangential circle in the tangential boiler to deviate, thereby making the combustion unstable.

[0039] Step S4: When the average weight of stored powder is within the third range, a third control signal is issued, and four electric air pumps are synchronously controlled to spray air directly into the central axis of the rotating flame inside the furnace at the second pressure value according to the third control signal.

[0040] It should be noted that this step involves the secondary combustion of pulverized coal with a high cumulative amount. As mentioned above, this embodiment uses intermittent air replenishment. Therefore, after the second preset time period, the ash weight may be high, and the first pressure value alone may not be sufficient to blow the pulverized coal towards the central axis of the furnace. Therefore, the pressure value needs to be increased to blow the pulverized coal towards the central axis of the furnace. When the average weight of the remaining pulverized coal is within the third range, a third control signal is issued, and four electric air pumps are synchronously controlled according to the third control signal to directly inject air into the rotating flame central axis inside the furnace at the second pressure value.

[0041] The third range value refers to a pre-set weight range used to determine the "need for high-intensity intervention in the accumulation of unburned coal powder." The maximum value of the second range value is less than the minimum value of the third range value to effectively distinguish between medium and high accumulation amounts. The third control signal is the control command issued by the system to the electric air pump control system when the average weight of coal powder falls into the third range value. The second control signal is also a mixed signal of digital and analog quantities. The digital signal is used to trigger the synchronous start of the four air pumps, while the analog signal carries the current or voltage requirement corresponding to the second pressure value parameter. The second pressure value refers to the electric pump jet pressure specified in the third control signal. The first pressure value and the second pressure value are functionally related. It should be noted that the second pressure value corresponds to the high accumulation of coal ash, so the second pressure value is greater than the first pressure value.

[0042] Specifically, the functional relationship between the first pressure value and the second pressure value is as follows: P1 = P2 * (L1 / L2 + m1 / M) In the formula, P1 represents the first pressure value, P2 represents the second pressure value, L1 represents the vertical distance from the direct-flow burner nozzle to the axis of the rotating flame center, L2 represents the straight-line distance from the starting point of the direct-flow jet nozzle to the intersection point of the direct-flow jet axis and the primary air jet axis, m1 represents the maximum value within the second range, and M represents the maximum value within the third range. It should be noted that the relationship between the first and second pressure values ​​is affected by the structural coefficient and the accumulation coefficient. The structural coefficient reflects the relative distance that the jet needs to cover, while the accumulation coefficient reflects the relative proportion of medium and high accumulation. The closer m1 is to M, the larger the coefficient, and the higher the required P1 is to remove medium-volume coal dust approaching the high volume. For example, when L1 = 8m, L2 = 2m, m1 = 1.5kg, and M = 3kg, the first and second pressure values ​​must satisfy P1 = P2 * 4.5. For example: This embodiment provides an intelligent control method for a tangential combustion boiler in a thermal power unit under low-load combustion. This method intelligently controls the tangential combustion boiler undergoing low-load combustion. In this example, the weight of coal ash is obtained from four coal ash collection trays (located at the bottom of the DC burners of the tangential combustion boiler), and the average weight of the four coal ash weights is calculated. Based on the magnitude of the average coal ash weight, the weight of unburned or incompletely burned coal powder mixture accumulated in the tangential combustion boiler is determined. If the average weight of the accumulated coal powder is within a first range, it indicates that the unburned or incompletely burned coal powder in the boiler does not currently need to be cleaned or recycled. It also indicates that the amount of coal powder mixture falling into the tangential combustion boiler is not sufficient. Therefore, after a second preset time interval, the average weight of coal ash on the four coal ash collection trays is obtained and calculated again. The average weight of the accumulated coal powder must be within a second or third range, where the maximum value of the first range is less than the minimum value of the second range. If the maximum value of the second range is less than the minimum value of the third range, it is determined that there is enough pulverized coal mixture falling into the tangential combustion boiler. It should be cleaned up in time. Based on the weight of the pulverized coal mixture, a second or third control signal should be issued in time. Based on the second or third control signal, using the acute angle formed by the axis of the DC jet and the primary air jet axis of the DC burner, four electric air pumps are simultaneously controlled to perform DC jet injection. This allows the DC jets from the electric air pumps to blow all the pulverized coal mixture accumulated on the coal ash collection plate directly into the rotating flame burning inside the furnace (where the temperature is higher and it is easier for the pulverized coal to reach the ignition point). This heats up and re-burns the unburned or incompletely burned pulverized coal mixture, and further reuses the unburned or incompletely burned pulverized coal mixture that has drifted onto the inner wall. This prevents the waste of incompletely burned or completely unburned pulverized coal, further improves energy utilization efficiency, and ultimately increases the power generation rate of thermal power generation. Example

[0043] In actual operation, due to the limited amount of coal ash in the coal ash collector, when air is blown into the furnace by the air pump, if the coal ash has been blown out, the air pump continuing to blow air into the furnace can easily cause the flame in the furnace to be affected by the airflow. In addition, the air jet will affect the flame temperature in the furnace. Therefore, how to reduce the impact of coal powder in the coal ash collector on flame combustion is an urgent technical problem to be solved.

[0044] To address this technical problem, this embodiment optimizes upon Embodiment 1. In step S3, after synchronously controlling four electric air pumps to spray air directly onto the rotating flame center axis inside the furnace at a pressure of a first pressure value according to the second control signal, the method further includes: issuing a first stop signal after a third preset duration, where the third preset duration is less than the second preset duration; synchronously controlling the four electric air pumps to stop spraying air according to the first stop signal, and then executing step S1. It should be noted that the third preset duration refers to the duration during which the electric air pumps maintain the first pressure value for spraying air in step S3, ensuring complete blowing of a medium amount of unburned coal powder and avoiding excessive spraying that could disturb the flame. Typically, the third preset duration is determined by the average coal ash mass. The first stop signal is a digital signal issued by the system to the electric air pump control system after the third preset duration ends. Synchronous stop control means that, based on the first stop signal, all four electric air pumps stop simultaneously, preventing flame deviation caused by continuous spraying from a single-angle pump.

[0045] In addition, similar to the previous preferred solution, under the condition of high accumulated coal ash, there is also the technical problem of how to reduce the impact of coal powder in the coal ash collector on flame combustion. To this end, in step S4, after synchronously controlling four electric air pumps to spray DC jets into the rotating flame center axis inside the furnace at a pressure of the first pressure value according to the second control signal, the method further includes: issuing a second stop signal after a fourth preset time; synchronously controlling the four electric air pumps to stop DC jetting according to the second stop signal and executing step S1; synchronously controlling the four electric air pumps to stop DC jetting according to the second stop signal and executing step S1; wherein, the third preset time is less than the fourth preset time, and the third preset time and the fourth preset time are functionally related. It should be noted that: the fourth preset time refers to the duration for which the electric air pumps maintain the second pressure value jetting in step S4, which is used to ensure that a high amount of unburned coal powder is completely blown and to avoid excessive jetting disturbing the flame. Under normal circumstances, the fourth preset time is determined by the magnitude of the average coal ash mass, so the fourth preset time is longer than the third preset time, and the two form a functional relationship, specifically T4=T3*(1+W 均值 / 2); The second stop signal refers to the synchronous stop command issued by the system to the electric air pump control system after the fourth preset time period ends, and it is a digital signal. Synchronous stop control means that based on the second stop signal, all four electric air pumps stop at the same time to avoid flame deviation caused by continuous jetting from a single-angle air pump.

[0046] The beneficial effects of this embodiment are: This embodiment provides an intelligent control method for a tangential combustion boiler used in thermal power units under low load. By setting corresponding stop steps after executing steps S3 and S4, the four electric air pumps stop in time after blowing away the coal ash on the coal ash collector, effectively reducing the impact of conveying coal powder in the coal ash collector on flame combustion. Example

[0047] In this embodiment, see Figures 2 to 4 This embodiment provides a tangential combustion boiler for implementing the intelligent control method for a four-corner tangential combustion boiler for low-load combustion in thermal power units provided in the aforementioned embodiment. It includes: a four-corner boiler body 10 and a DC burner 20. The four-corner boiler body 20 includes a furnace 11 and four furnace walls 12. The DC burners 20 are respectively located at the intersection of two adjacent furnace walls 12. A coal ash collecting plate 30 is provided at the bottom of the DC burner 20, and a coal slag recovery plate (not shown in the figure) is provided at the bottom of the furnace 11. The coal slag recovery plate is used to recover the coal powder mixture after combustion, and the coal ash collecting plate 30 is used to collect unburned or insufficiently burned coal powder. It also includes: an electric air pump 50, the suction end of which is connected to the interior of the four-corner boiler body 10, and the jet end of which is used to blow the coal powder mixture accumulated on the coal ash collecting plate 30 towards the rotating flame inside the furnace (i.e., the outside of the furnace).

[0048] It should be noted that the ash collection basin refers to a funnel-shaped pulverized coal collection component installed at the bottom of the DC burner. Its structure is a cone shape, wider at the top and narrower at the bottom, which guides the pulverized coal to naturally converge to the center of the bottom, preventing accumulation at the corners. The four collection basins correspond to the four burners, primarily used to collect pulverized coal that falls from the nozzle or is not fully burned during low-load combustion, preventing it from falling directly to the bottom of the furnace and mixing with the ash. In addition, the ash collection basin is equipped with a weight acquisition unit to measure the amount of ash collected. The ash recovery basin refers to a ring-shaped or square ash hopper located at the bottom of the furnace, used to collect ash after complete combustion. Together with the ash collection basin, it forms a separation and recovery system of "unburned pulverized coal - burned ash," preventing unburned pulverized coal from being contaminated by ash and reducing secondary combustion efficiency. It needs to be compatible with ash weight acquisition to support combustion ratio calculations.

[0049] Specifically, a coal ash ejection structure 60 is provided below the coal ash collecting plate. The coal ash ejection structure includes a coal ash nozzle 61, a spherical cavity 62, and a conical nozzle 63. The coal ash collecting plate 30 is a funnel-shaped collecting plate. The smaller end of the conical nozzle 63 is connected to the coal ash nozzle 61, and the larger end of the conical nozzle 63 is connected to the spherical cavity. The top of the spherical cavity is connected to the center of the coal ash collecting plate 30 through a conduit. The jet end of the electric air pump is connected to the spherical cavity 62, and the connection between the electric air pump 50 and the spherical cavity 62 is aligned with the larger end of the conical nozzle. The jet direction of the coal ash nozzle corresponds to the central axis of the rotating flame.

[0050] It should be noted that the function of the ash ejection structure is to integrate pulverized coal collection and injection. By altering the pulverized coal delivery path and airflow dynamics, it ensures that accumulated unburned pulverized coal is blown into the high-temperature core zone of the furnace, preventing pulverized coal scattering or flame instability caused by dispersed injection, thereby improving combustion efficiency and energy utilization. Specifically, the ash ejection structure includes an ash nozzle, a spherical cavity, and a conical nozzle, which together form a highly efficient gas-solid two-phase flow delivery system. The spherical cavity provides space for mixing and buffering pulverized coal and gas. On one hand, it counteracts pressure fluctuations during electric air pump injection; on the other hand, it ensures thorough mixing of the airflow with the pulverized coal falling from the duct, preventing pulverized coal blockage within the channel. The conical nozzle is a tapered pipe connecting the spherical cavity and the ash nozzle. Its tapered structure, with a large inlet and a small outlet, accelerates the airflow, ensuring that the pulverized coal-carrying airflow reaches the center of the furnace flame. The ash nozzle is the end directional component of the spray structure. Its spray direction is towards the central axis of the rotating flame in the furnace and forms an acute angle with the primary air spray axis of the DC burner to avoid airflow impacting and disturbing the flame. At the same time, the ash nozzle reduces the diameter of the pulverized coal outlet, allowing the pulverized coal to be sprayed relatively concentrated in one direction.

[0051] In actual operation, the coal ash collected by the coal ash collecting pan flows along the conical outer wall into the spherical cavity under the action of gravity. When the air pump sprays air, the airflow enters the spherical cavity from the connecting outlet, forming a vortex in the cavity, which fully mixes the coal powder with the air to reduce the concentration fluctuation during injection. Subsequently, the mixed airflow enters the conical nozzle under pressure, entering from the large end to the small end of the conical nozzle. The cross-sectional contraction increases the flow velocity. Finally, it is sprayed from the coal ash nozzle into the rotating flame of the tangential boiler.

[0052] Specifically, each of the four furnace walls is provided with a coal ash guiding structure 70. The coal ash guiding structure includes a first guide bar 71 and a second guide bar 72. Both the first guide bar and the second guide bar are provided with a channeling groove 73. The groove surface of the channeling groove 73 faces the top of the furnace. On each furnace wall, the beginning of the first guide bar is connected to the beginning of the second guide bar. The end of the first guide bar is located above the coal ash collecting plate on one side of its furnace wall, and the end of the second guide bar is located above the coal ash collecting plate on the other side of its furnace wall. The connection point between the first guide bar and the second guide bar is higher than the position of the coal ash collecting plate, and the included angle formed by the first guide bar and the second guide bar is an obtuse angle.

[0053] It should be noted that ash guiding structures are installed on all four furnace walls. This structure effectively solves the problem of incompletely burned or completely unburned coal dust drifting onto the inner wall of the furnace during low-load combustion, avoiding coal dust waste, and improving recovery efficiency by guiding the coal dust to the ash collection plate.

[0054] During operation, this structure serves as an auxiliary component, ensuring that the pulverized coal mixture moves directionally to the ash collection plate before the electric air pump is started, reducing the need for secondary treatment. Specifically, ash guiding structures are installed on all four furnace walls. These structures are primarily used to capture and guide the scattered pulverized coal mixture, preventing it from randomly adhering to the furnace wall surface or being carried away by exhaust gas. In application scenarios, such as when the boiler is operating at low load, the primary air intensity weakens, and pulverized coal easily escapes from the rotating flame. The ash guiding structure, through its physical design, forcibly guides the scattered pulverized coal to the collection plate. No additional energy input is required during operation; it is achieved solely through the combined action of gravity and airflow.

[0055] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here. Example

[0056] In this embodiment, see Figure 5 The electronic device 1000 includes a memory 1010 and a processor 1020.

[0057] The processor 1020 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0058] Memory 1010 may include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. ROM may store static data or instructions required by the processor 1020 or other modules of the computer. Permanent storage devices may be read-write storage devices. Permanent storage devices may be non-volatile storage devices that retain stored instructions and data even when the computer is powered off. In some embodiments, permanent storage devices use mass storage devices (e.g., magnetic or optical disks, flash memory) as permanent storage devices. In other embodiments, permanent storage devices may be removable storage devices (e.g., floppy disks, optical drives). System memory may be a read-write storage device or a volatile read-write storage device, such as dynamic random access memory. System memory may store some or all of the instructions and data required by the processor during operation. Furthermore, memory 1010 may include any combination of computer-readable storage media, including various types of semiconductor memory chips (DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and disks and / or optical disks may also be used. In some implementations, memory 1010 may include a removable storage device that is readable and / or writable, such as a laser disc (CD), a read-only digital multifunction optical disc (e.g., DVD-ROM, dual-layer DVD-ROM), a read-only Blu-ray disc, an ultra-high density optical disc, a flash memory card (e.g., SD card, mini SD card, Micro-SD card, etc.), a magnetic floppy disk, etc. Computer-readable storage media do not contain carrier waves or transient electronic signals transmitted wirelessly or via wired connections.

[0059] The memory 1010 stores executable code, which, when processed by the processor 1020, can cause the processor 1020 to execute part or all of the methods described above.

[0060] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different emphases; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application's embodiments can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application's embodiments can be combined, divided, and deleted according to actual needs.

[0061] Furthermore, the method according to this application can also be implemented as a computer program or computer program product, which includes computer program code instructions for performing some or all of the steps in the method described above.

[0062] Alternatively, this application may be implemented as a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) storing executable code (or computer program, or computer instruction code) thereon, which, when executed by a processor of an electronic device (or electronic device, server, etc.), causes the processor to perform part or all of the steps of the methods described above according to this application.

[0063] Those skilled in the art will also understand that the various exemplary logic blocks, modules, circuits, and algorithm steps described in connection with the present application can be implemented as electronic hardware, computer software, or a combination of both.

[0064] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0065] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A smart control method for a tangential combustion boiler used in low-load combustion of thermal power units, characterized in that, include: Step S1: Obtain the coal ash weight values ​​of the four coal ash collection pans respectively, and calculate the average of the four coal ash weight values ​​to obtain the average coal ash weight; wherein, the four coal ash collection pans are respectively located at the bottom of the DC burner of the four-corner tangential combustion boiler; Step S2: When the average weight of the stored powder is within the first range, a first control signal is issued, and step S1 is executed again after a second preset time according to the first control signal. Step S3: When the average weight of the stored powder is within the second range, a second control signal is issued, and four electric air pumps are synchronously controlled to spray DC air into the rotating flame center axis inside the furnace at a pressure of the first pressure value according to the second control signal. Step S4: When the average weight of the stored powder is within the third range, a third control signal is issued, and four electric air pumps are synchronously controlled to spray DC air into the rotating flame center axis inside the furnace at a pressure of the second pressure value according to the third control signal. Wherein, the maximum value of the first range value is less than the minimum value of the second range value, the maximum value of the second range value is less than the minimum value of the third range value, the first pressure value and the second pressure value are in a functional relationship, and the angle formed by the axis of the DC jet and the primary air jet axis of the DC burner is an acute angle.

2. The intelligent control method for a tangential combustion boiler according to claim 1, characterized in that, Before obtaining the coal ash weight values ​​of the four coal ash collection pans respectively, the following steps are included: After the DC burner is ignited and combustion occurs, every first preset time interval, the total weight of all the pulverized coal input into the furnace by the DC burner within the first preset time interval is extracted, and the total weight of the slag that falls into the bottom of the furnace within the first preset time interval is obtained. Calculate the ratio of the weight of the coal slag to the weight of the coal powder to obtain the coal powder combustion ratio; Determine whether the pulverized coal combustion ratio is less than a preset combustion ratio; If so, proceed to step S1.

3. The intelligent control method for a tangential combustion boiler according to claim 1, characterized in that, In step S3, after synchronously controlling four electric air pumps to inject direct current air at a pressure of a first pressure value into the central axis of the rotating flame inside the furnace according to the second control signal, the process further includes: After a third preset duration, a first stop signal is issued, wherein the third preset duration is less than the second preset duration; Based on the first stop signal, the four electric air pumps are synchronously controlled to stop DC jetting, and step S1 is executed.

4. The intelligent control method for a four-corner tangential combustion boiler according to claim 3, characterized in that, In step S4, after synchronously controlling four electric air pumps to inject direct current air at a first pressure value into the central axis of the rotating flame inside the furnace according to the third control signal, the process further includes: After the fourth preset duration, a second stop signal is issued; According to the second stop signal, the four electric air pumps are synchronously controlled to stop DC jetting and step S1 is executed; wherein, the third preset duration is less than the fourth preset duration, and the third preset duration and the fourth preset duration are in a functional relationship.

5. The intelligent control method for a tangential combustion boiler according to claim 1, characterized in that, The functional relationship between the first pressure value and the second pressure value is as follows: P1 = P2 * (L1 / L2 + m1 / M); In the formula, P1 represents the first pressure value, P2 represents the second pressure value, L1 represents the vertical distance from the DC burner nozzle to the axis of the rotating flame center, L2 represents the straight-line distance from the starting point of the DC jet nozzle to the intersection point of the DC jet axis and the primary air jet axis, m1 represents the maximum value within the second range, and M represents the maximum value within the third range.

6. A tangential combustion boiler, used in applying the intelligent control method for a four-corner tangential combustion boiler as described in claims 1-5, characterized in that, include: The four-corner boiler body includes a furnace and four furnace walls, and the direct current burners are respectively set at the intersection of two adjacent furnace walls. The bottom of the DC burner is provided with a coal ash collecting plate, and the bottom of the furnace is provided with a coal slag recovery plate. The coal slag recovery plate is used to recover the coal powder mixture after combustion, and the coal ash collecting plate is used to collect unburned or incompletely burned coal powder. It also includes: an electric air pump, the suction end of which is connected to the interior of the four-corner boiler body, and the jet end of which is used to blow the coal powder mixture accumulated on the coal ash collection plate toward the rotating flame inside the furnace.

7. The tangential combustion boiler according to claim 6, characterized in that, Below the coal ash collecting plate is a coal ash spraying structure, which includes a coal ash nozzle, a spherical cavity and a conical spray pipe. The coal ash collecting plate is a funnel-shaped collecting plate. The smaller end of the conical nozzle is connected to the coal ash nozzle, and the larger end of the conical nozzle is connected to the spherical cavity; the top of the spherical cavity is connected to the center of the coal ash collecting plate through a conduit. The jet end of the electric air pump is connected to the spherical cavity, and the connection between the electric air pump and the spherical cavity is aligned with the port of the larger end of the conical nozzle; wherein, the jet direction of the coal ash nozzle corresponds to the central axis of the rotating flame.

8. The tangential combustion boiler according to claim 7, characterized in that, All four sides of the furnace wall are provided with a coal ash guiding structure. The coal ash guiding structure includes a first guide bar and a second guide bar. Both the first guide bar and the second guide bar are provided with a channeling groove. The groove surface of the channeling groove faces the top of the furnace. In each furnace wall, the beginning of the first guide strip is connected to the beginning of the second guide strip. The end of the first guide strip is located above the coal ash collection plate on one side of the furnace wall, and the end of the second guide strip is located above the coal ash collection plate on the other side of the furnace wall. The connection point between the first guide strip and the second guide strip is higher than the position of the coal ash collection plate, and the included angle formed by the first guide strip and the second guide strip is an obtuse angle.

9. An electronic device, characterized in that, include: processor; as well as A memory storing executable code, which, when executed by the processor, causes the processor to perform the intelligent control method for a tangential combustion boiler as described in any one of claims 1-5.

10. A non-transitory machine-readable storage medium, characterized in that, It stores executable code, which, when executed by the processor of an electronic device, causes the processor to execute the intelligent control method for a tangential combustion boiler as described in any one of claims 1-5.

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