System and method for automatically adjusting wind speed deviation of outlet of coal mill

Abstract

The embodiment of the invention provides a system and method for automatically adjusting the wind speed deviation of an outlet of a coal mill. The system comprises the coal mill, a plurality of powder pipes, a boiler and wind speed adjusting equipment. The wind speed adjusting equipment is arranged on a plurality of powder pipes, calculates a wind speed measurement average value according to the wind speed measurement value in each powder pipe, and also calculates the wind speed deviation of each powder pipe according to the wind speed measurement average value; and the wind speed of the plurality of powder pipes is adjusted according to the comparison result of the wind speed measurement value of the powder pipe and the wind speed measurement values of other powder pipes in the plurality of powder pipes, the comparison result of the wind speed deviation of the powder pipe and the preset wind speed deviation and the adjustment allowance state. According to the method, the wind speed of the powder pipe is adjusted in real time according to state judgment of parameters such as the wind speed measurement value, the wind speed deviation and the adjustment allowance, dynamic adjustment of tracking the wind speed is achieved, and the method has great significance in improving the combustion efficiency of the boiler, reducing combustion deflection and slagging phenomena and reducing the operation cost and environmental pollution.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of coal mills in coal-fired power plants, specifically relating to a system and method for automatically adjusting the outlet wind speed deviation of a coal mill. Background Technology

[0002] During the operation of power plant boilers, coal mills are the most commonly used pulverizing equipment. To ensure stable combustion within the boiler and avoid combustion deviation, the air velocity in the pulverized coal outlet pipes must be as close as possible, and the relative deviation of the air velocity in each pulverized coal pipe must not exceed a preset value. However, due to differences in factors such as the length and resistance of the various outlet pipes of the coal mill, the air velocity in each pulverized coal pipe varies significantly. This leads to problems such as combustion deviation, uneven heat load distribution, low combustion efficiency, overheating of the water-cooled walls, and even coking and ash accumulation in the boiler.

[0003] Currently, a common solution is to install adjustable orifices on the pulverized coal outlet pipes of the coal mill, and then conduct a wind speed leveling test to ensure that the relative deviation of the wind speed in each pulverized coal pipe meets the requirements. However, in actual operation, this method is complex and labor-intensive. Furthermore, after changes in coal type, load, and long-term operation, the actual wind speed has already deviated from the operating conditions during the leveling test, affecting the safe operation of the boiler.

[0004] Therefore, developing a system and method that can automatically adjust the wind speed deviation of the coal mill outlet pulverized coal pipe is of great significance for improving boiler combustion efficiency, reducing combustion deviation and slagging, and lowering operating costs and environmental pollution. 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 system and method for automatically adjusting the outlet wind speed deviation of a coal mill.

[0006] A first aspect of the embodiments of this disclosure provides a system for automatically adjusting the outlet wind speed deviation of a coal mill, comprising:

[0007] The system comprises a coal mill, several pulverized coal pipes, a boiler, and a wind speed adjustment device. The several pulverized coal pipes are connected between the pulverized coal outlet of the coal mill and the pulverized coal inlet of the boiler. The wind speed adjustment device is installed on the several pulverized coal pipes. The wind speed adjustment device calculates an average wind speed measurement based on the wind speed measurement values ​​in each pulverized coal pipe, calculates the wind speed deviation of each pulverized coal pipe based on the average wind speed measurement value, and adjusts the wind speed of the several pulverized coal pipes based on a comparison of the wind speed measurement value of the pulverized coal pipe with the wind speed measurement values ​​of other pulverized coal pipes, a comparison of the wind speed deviation of the pulverized coal pipe with a preset wind speed deviation, and an adjustment margin.

[0008] Optionally, the wind speed adjustment device includes a wind speed adjustment actuator, a wind speed measuring device, and a wind speed adjustment device;

[0009] The wind speed measuring device is correspondingly installed on the powder pipe and electrically connected to the wind speed adjusting device. The wind speed measuring device is used to measure the wind speed in the powder pipe to obtain the wind speed measurement value.

[0010] The wind speed adjustment actuator is correspondingly installed on the powder pipe and is electrically connected to the wind speed adjustment device.

[0011] The wind speed adjustment device calculates the average wind speed measurement value based on the wind speed measurement value, and calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. The wind speed adjustment device also obtains the adjustment margin state based on the opening signal fed back by the wind speed adjustment actuator. The wind speed adjustment device adjusts the opening of the wind speed adjustment actuator based on the comparison result of the wind speed measurement value of each powder pipe, the comparison result of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state.

[0012] Optionally, the wind speed adjustment device further includes a speed measurement pipeline, an opening execution pipeline, and an opening feedback pipeline;

[0013] The wind speed measuring device is electrically connected to the wind speed adjusting device through the speed measuring pipeline, and the wind speed measurement value of the wind speed measuring device is obtained through the speed measuring pipeline;

[0014] The wind speed adjustment device obtains the opening signal of the wind speed adjustment actuator through the opening feedback pipeline, and determines the adjustment margin state according to the opening signal. The wind speed adjustment device generates an opening adjustment command based on the comparison results of the wind speed measurement values ​​of each powder pipe, the comparison results of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state, and outputs it to the wind speed adjustment actuator through the opening execution pipeline to adjust the opening of the wind speed adjustment actuator.

[0015] Optionally, the wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe based on the following conditions: the wind speed measurement value of the powder pipe is less than the wind speed measurement value of other powder pipes among a plurality of powder pipes; the wind speed deviation of the powder pipe is greater than a preset wind speed deviation; and the wind speed adjustment actuator of the powder pipe has an adjustment margin.

[0016] Optionally, the wind speed adjustment device may, based on the following conditions: the wind speed measurement value of the powder pipe is greater than the wind speed measurement value of other powder pipes among the plurality of powder pipes; the wind speed deviation of the powder pipe is greater than a preset wind speed deviation; and the wind speed adjustment actuator of the powder pipe does not have an adjustment margin, increase the opening of the wind speed adjustment actuator corresponding to the powder pipe whose wind speed measurement value is less than the wind speed measurement value of the powder pipe and has an adjustment margin.

[0017] Optionally, the wind speed adjustment device may reduce the opening of the wind speed adjustment actuator corresponding to the powder pipe if the wind speed measurement value of the powder pipe is greater than the wind speed measurement value of other powder pipes among the powder pipes, the wind speed deviation of the powder pipe is greater than the preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe has an adjustment margin while the other powder pipes do not have an adjustment margin.

[0018] Furthermore, it also includes a coal feeder, the coal feeder's outlet being connected to the raw coal inlet of the coal mill.

[0019] Furthermore, it also includes: a raw coal bunker, the discharge port of which is connected to the coal feed inlet of the coal feeder.

[0020] A second aspect of the embodiments of this disclosure provides a method for automatically adjusting the outlet wind speed deviation of a coal mill, the method being implemented according to the system described above, comprising:

[0021] The wind speed inside the powder pipe is measured using the aforementioned wind speed measuring device;

[0022] The opening signal of the wind speed adjustment actuator is obtained using the wind speed adjustment device, and the adjustment margin state is determined based on the opening signal.

[0023] The wind speed adjustment device calculates the wind speed deviation of each powder pipe based on the wind speed measurement value and the average wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. The device adjusts the wind speed of the powder pipes based on the comparison results of the wind speed measurement value of the powder pipe with the wind speed measurement values ​​of other powder pipes, the comparison results of the wind speed deviation of the powder pipe with the preset wind speed deviation, and the adjustment margin state.

[0024] Optionally, the wind speed adjustment device calculates the wind speed deviation of each powder pipe based on the wind speed measurement value and the average wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. The device then adjusts the wind speed of the powder pipes based on a comparison of the wind speed measurement value of the powder pipe with the wind speed measurement values ​​of other powder pipes, a comparison of the wind speed deviation of the powder pipe with a preset wind speed deviation, and an adjustment margin condition. This includes: the wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe if the wind speed measurement value of the powder pipe is less than the wind speed measurement values ​​of other powder pipes, the wind speed deviation of the powder pipe is greater than the preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe has an adjustment margin.

[0025] The beneficial effects of the embodiments of this disclosure include:

[0026] The system of this application can adjust the air speed of the pulverized coal tube in real time based on the status of parameters such as wind speed measurement value, wind speed deviation and adjustment margin, thereby realizing dynamic adjustment of tracking wind speed. This is of great significance for improving boiler combustion efficiency, reducing combustion deviation and slagging, and reducing operating costs and environmental pollution. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a system for automatically adjusting the outlet wind speed deviation of a coal mill, according to an embodiment of the present disclosure.

[0028] Figure 2 This is a flowchart illustrating a method for automatically adjusting the outlet wind speed deviation of a coal mill, according to another embodiment of this disclosure.

[0029] In the diagram, 1. Coal mill; 2. Raw coal bunker; 3. Coal feeder; 4. Boiler; 5. Wind speed adjustment actuator; 6. Wind speed measuring device; 7. Wind speed adjustment device; 8. Speed ​​measuring pipeline; 9. Opening execution pipeline; 10. Opening feedback pipeline; 11. Powder pipe. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 1 As shown, a system for automatically adjusting the outlet air velocity deviation of a coal mill includes: a coal mill 1, a plurality of pulverized coal pipes 11, a boiler 4, and an air velocity adjustment device. The plurality of pulverized coal pipes 11 are connected between the pulverized coal outlet of the coal mill 1 and the pulverized coal inlet of the boiler 4. The air velocity adjustment device is installed on the plurality of pulverized coal pipes 11. The air velocity adjustment device calculates an average air velocity measurement value based on the air velocity measurement value within each pulverized coal pipe 11, and also calculates the air velocity deviation of each pulverized coal pipe based on the average air velocity measurement value. Furthermore, it adjusts the air velocity of the plurality of pulverized coal pipes based on a comparison of the air velocity measurement value of the pulverized coal pipe with the air velocity measurement values ​​of other pulverized coal pipes, a comparison of the air velocity deviation of the pulverized coal pipe with a preset air velocity deviation, and an adjustment margin state.

[0034] The system of this application can dynamically adjust the wind speed of the pulverized coal tube 11 in real time based on the status of parameters such as wind speed measurement value, wind speed deviation and adjustment margin. This is of great significance for improving the combustion efficiency of boiler 4, reducing combustion deviation and slagging, and reducing operating costs and environmental pollution.

[0035] It is understood that in this patent, wind speed deviation refers to the degree of deviation between the average wind speed measured by each pulverizer pipe and this average (the ratio of the difference between the measured value and the average value to the average value). For example, if there are 4 pulverizer pipes at the outlet of a coal mill, and the measured wind speeds are 11, 15, 12, and 16 respectively, then the average value is 13.5, and the wind speed deviations of each pulverizer pipe are -18.5%, 11.1%, -11.1%, and 18.5% respectively.

[0036] In some embodiments, the wind speed adjustment device includes a wind speed adjustment actuator 5, a wind speed measuring device 6, and a wind speed adjustment device 7.

[0037] The wind speed measuring device 6 is correspondingly installed on the powder pipe 11 and is electrically connected to the wind speed adjusting device 7. The wind speed measuring device 6 is used to measure the wind speed in the powder pipe 11 to obtain the wind speed measurement value.

[0038] The wind speed adjustment actuator 5 is correspondingly installed on the powder pipe 11 and is electrically connected to the wind speed adjustment device 7.

[0039] The wind speed adjustment device 7 calculates the average wind speed measurement value based on the wind speed measurement value, and calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. The wind speed adjustment device 7 also obtains the adjustment margin state based on the opening signal fed back by the wind speed adjustment actuator 5. The wind speed adjustment device 7 adjusts the opening of the wind speed adjustment actuator 5 based on the comparison result of the wind speed measurement value of each powder pipe, the comparison result of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state.

[0040] In some embodiments, the wind speed adjustment device further includes a speed measurement line 8, an opening execution line 9, and an opening feedback line 10.

[0041] The wind speed measuring device 6 is electrically connected to the wind speed adjusting device 7 through the speed measuring pipeline 8, and the wind speed measurement value of the wind speed measuring device 6 is obtained through the speed measuring pipeline 8.

[0042] The wind speed adjustment device 7 obtains the opening signal of the wind speed adjustment actuator 5 through the opening feedback pipeline 10, and determines the adjustment margin state according to the opening signal. The wind speed adjustment device 7 generates an opening adjustment command based on the comparison results of the wind speed measurement values ​​of each powder pipe, the comparison results of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state, and outputs it to the wind speed adjustment actuator 5 through the opening execution pipeline 9 to adjust the opening of the wind speed adjustment actuator 5.

[0043] In some embodiments, the wind speed adjustment device 7 increases the opening of the wind speed adjustment actuator 5 corresponding to the powder pipe 11 based on the following conditions: the wind speed measurement value of the powder pipe 11 is less than the wind speed measurement value of other powder pipes 11 among a plurality of powder pipes 11; the wind speed deviation of the powder pipe 11 is greater than a preset wind speed deviation; and the wind speed adjustment actuator 5 of the powder pipe 11 has an adjustment margin.

[0044] In some embodiments, the wind speed adjustment device 7 increases the opening degree of the wind speed adjustment actuator 5 corresponding to the powder pipe 11 whose wind speed measurement value is greater than that of other powder pipes 11 among the powder pipes 11, whose wind speed deviation is greater than a preset wind speed deviation, and whose wind speed adjustment actuator 5 does not have an adjustment margin, based on the following conditions: the wind speed measurement value of the powder pipe 11 is greater than that of the powder pipe 11, and which has an adjustment margin.

[0045] In some embodiments, the wind speed adjustment device 7 reduces the opening of the wind speed adjustment actuator 5 corresponding to the powder pipe 11 based on the following conditions: the wind speed measurement value of the powder pipe 11 is greater than the wind speed measurement value of other powder pipes 11 among the powder pipes 11; the wind speed deviation of the powder pipe 11 is greater than the preset wind speed deviation; and the wind speed adjustment actuator 5 of the powder pipe 11 has an adjustment margin while the other powder pipes 11 do not have an adjustment margin.

[0046] Furthermore, the system also includes a coal feeder 3, the coal feeder 3 having a coal feed outlet connected to the raw coal inlet of the coal mill 1.

[0047] In some embodiments, the system further includes a raw coal bunker 2, the discharge port of which is connected to the coal feeder 3.

[0048] Specifically, such as Figure 1 As shown, the discharge port of the raw coal bunker 2 is connected to the pulverized coal inlet of the coal mill 1 via the coal feeder 3. The pulverized coal outlet of the coal mill 1 is connected to the inlet of the pulverized coal pipe 11 (N pipes are set, and the i-th pipe is described below). A wind speed adjustment actuator 5 and a wind speed measuring device 6 are sequentially installed along the pulverized coal pipe 11. The pulverized coal pipe 11 is connected to the burner on the boiler 4. When wind speed adjustment is required, the wind speed measuring device 6 first measures the wind speed in each pulverized coal pipe 11 and obtains the wind speed measurement value. Then, the wind speed measurement result of each pulverized coal pipe 11 is sent to the wind speed adjustment device 7 through the speed measuring pipeline 8. The wind speed adjustment device 7 compares and judges the wind speed measurement values ​​of each pulverized coal pipe 11 and obtains the pulverized coal pipes with a wind speed deviation greater than 5% (preset wind speed deviation). Next, the opening signal of the current wind speed adjustment actuator 5 is fed back to the wind speed adjustment device 7 through the opening feedback pipeline 10 to determine whether each wind speed adjustment actuator 5 has an adjustment margin. Furthermore, adjustments are made in different modes, including:

[0049] Mode (1): If the wind speed deviation of the i-th powder pipe is greater than 5%, the wind speed of this powder pipe is lower than that of other powder pipes, and the wind speed adjustment actuator 5 has an adjustment margin, then: the opening of the wind speed adjustment actuator 5 is increased slightly, the wind speed measuring device 6 measures the wind speed of each powder pipe after adjustment, and sends it to the wind speed adjustment device 7 through the speed measuring pipeline 8. The wind speed adjustment device 7 compares and calculates the deviation of the wind speed measurement values ​​of each powder pipe, and determines whether the wind speed deviation of the i-th powder pipe after adjustment meets the conditions. If it does not meet the conditions, the opening signal is output through the opening execution pipeline 9 to further increase the opening of the wind speed adjustment actuator 5. The above process is repeated until the wind speed deviation meets the requirements. It can be understood that the average wind speed measurement value can be determined by the wind speed of each powder pipe.

[0050] Mode (2): The wind speed deviation of the i-th powder pipe is greater than 5%, and the wind speed of the powder pipe is greater than that of other powder pipes.

[0051] 1) If the wind speed adjustment actuator 5 of the i-th powder pipe does not have an adjustment margin while the wind speed adjustment actuators 5 of other powder pipes do, then: the wind speed adjustment device 7 compares the wind speeds of other powder pipes, selects the powder pipe with the lower wind speed, and slightly increases the opening of its wind speed adjustment actuator 5. The wind speed measuring device 6 measures the wind speed of each powder pipe after adjustment and sends it to the wind speed adjustment device 7 through the speed measuring pipeline 8. The wind speed adjustment device 7 compares and calculates the deviation of the wind speed of each powder pipe, and determines whether the wind speed deviation of the i-th powder pipe and other powder pipes after adjustment meets the conditions. If not, it outputs an opening signal through the opening execution pipeline 9 to further increase the opening of the corresponding wind speed adjustment actuator 5. The above process is repeated until the wind speed deviation meets the requirements.

[0052] 2) If the air speed adjustment actuator 5 of the i-th powder pipe has an adjustment margin while the air speed adjustment actuators 5 of other powder pipes do not, then: the air speed adjustment device 7 outputs an opening signal through the opening execution pipeline 9 to reduce the opening of the air speed adjustment actuator 5 of the i-th powder pipe; the air speed measuring device 6 measures the air speed of each powder pipe after adjustment and sends it to the air speed adjustment device 7 through the speed measuring pipeline 8; the air speed adjustment device 7 compares and calculates the deviation of the air speed of each powder pipe and determines whether the air speed deviation of the i-th powder pipe and other powder pipes after adjustment meets the conditions; if not, it outputs an opening signal through the opening execution pipeline 9 to further reduce the opening of the corresponding air speed adjustment actuator 5, and repeats the above process until the air speed deviation meets the requirements. However, in this case, the opening of the i-th powder pipe wind speed adjustment actuator 5 cannot be reduced indefinitely. In the wind speed adjustment device 7, each wind speed adjustment actuator 5 is set with a threshold. If the wind speed deviation still exists when the opening is reduced to the wind speed adjustment actuator threshold, no further adjustment will be made, and the system will output an alarm signal.

[0053] 3) When more than one of the N powder pipes 11 has a wind speed deviation, the adjustment method is the same as in mode (1) and mode (2), but the difference is that the opening change of the wind speed adjustment device 7 to the wind speed adjustment actuator 5 is reduced at this time.

[0054] It is understandable that the wind speed adjustment actuator 5 can be electric or pneumatic, and the system is described for a single coal mill. However, depending on the actual site conditions, it can also be applied to other coal mills to achieve deviation adjustment of the wind speed of the powder pipe 11 of multiple coal mills.

[0055] refer to Figure 2 A second aspect of the embodiments of this disclosure provides a method for automatically adjusting the outlet wind speed deviation of a coal mill, the method being implemented according to the system described above, comprising:

[0056] S101. Measure the wind speed inside the powder pipe using the wind speed measuring device.

[0057] S102. Obtain the opening signal of the wind speed adjustment actuator using the wind speed adjustment device, and determine the adjustment margin state based on the opening signal.

[0058] S103. The wind speed adjustment device calculates the average value of the wind speed measurement based on the wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average value of the wind speed measurement. The device adjusts the wind speed of the powder pipes based on the comparison result of the wind speed measurement value of the powder pipe with the wind speed measurement value of other powder pipes among the powder pipes, the comparison result of the wind speed deviation of the powder pipe with the preset wind speed deviation, and the adjustment margin state.

[0059] In some embodiments, the wind speed adjustment device calculates the average value of the wind speed measurement based on the wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average value of the wind speed measurement value, and adjusts the wind speed of the powder pipes according to the comparison result of the wind speed measurement value of the powder pipe with the wind speed measurement value of other powder pipes among the powder pipes, the comparison result of the wind speed deviation of the powder pipe with the preset wind speed deviation, and the adjustment margin state, including: the wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe if the wind speed measurement value of the powder pipe is less than the wind speed measurement value of other powder pipes among the powder pipes, the wind speed deviation of the powder pipe is greater than the preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe has the condition of adjustment margin.

[0060] 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 system for automatically adjusting the outlet air velocity deviation of a coal mill, characterized in that, The system includes a coal mill, several pulverized coal pipes, a boiler, and a wind speed adjustment device. The several pulverized coal pipes are connected between the pulverized coal outlet of the coal mill and the pulverized coal inlet of the boiler. The wind speed adjustment device is installed in the several pulverized coal pipes. The wind speed adjustment device calculates the average wind speed measurement value based on the wind speed measurement value in each pulverized coal pipe, and also calculates the wind speed deviation of each pulverized coal pipe based on the average wind speed measurement value. The device adjusts the wind speed of the several pulverized coal pipes based on the comparison result of the wind speed measurement value of the pulverized coal pipe with the wind speed measurement value of other pulverized coal pipes, the comparison result of the wind speed deviation of the pulverized coal pipe with the preset wind speed deviation, and the adjustment margin state.

2. The system according to claim 1, characterized in that, The wind speed adjustment device includes a wind speed adjustment actuator, a wind speed measuring device, and a wind speed adjustment device. The wind speed measuring device is correspondingly installed on the powder pipe and electrically connected to the wind speed adjusting device. The wind speed measuring device is used to measure the wind speed in the powder pipe to obtain the wind speed measurement value. The wind speed adjustment actuator is correspondingly installed on the powder pipe and is electrically connected to the wind speed adjustment device. The wind speed adjustment device calculates the average wind speed measurement value based on the wind speed measurement value, and calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. The wind speed adjustment device also obtains the adjustment margin state based on the opening signal fed back by the wind speed adjustment actuator. The wind speed adjustment device adjusts the opening of the wind speed adjustment actuator based on the comparison result of the wind speed measurement value of each powder pipe, the comparison result of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state.

3. The system according to claim 2, characterized in that, The wind speed adjustment device also includes a speed measurement pipeline, an opening execution pipeline, and an opening feedback pipeline; The wind speed measuring device is electrically connected to the wind speed adjusting device through the speed measuring pipeline, and the wind speed measurement value of the wind speed measuring device is obtained through the speed measuring pipeline; The wind speed adjustment device obtains the opening signal of the wind speed adjustment actuator through the opening feedback pipeline, and determines the adjustment margin state according to the opening signal. The wind speed adjustment device generates an opening adjustment command based on the comparison results of the wind speed measurement values ​​of each powder pipe, the comparison results of the wind speed deviation and the preset wind speed deviation, and the adjustment margin state, and outputs it to the wind speed adjustment actuator through the opening execution pipeline to adjust the opening of the wind speed adjustment actuator.

4. The system according to claim 1, characterized in that, The wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe based on the following conditions: the wind speed measurement value of the powder pipe is less than the wind speed measurement value of other powder pipes among a plurality of powder pipes; the wind speed deviation of the powder pipe is greater than the preset wind speed deviation; and the wind speed adjustment actuator of the powder pipe has an adjustment margin.

5. The system according to claim 1, characterized in that, The wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe whose wind speed measurement value is greater than that of other powder pipes among the powder pipes, whose wind speed deviation is greater than a preset wind speed deviation, and whose wind speed adjustment actuator does not have an adjustment margin, based on the following conditions: the wind speed measurement value of the powder pipe is greater than that of the powder pipe, the wind speed deviation of the powder pipe is greater than a preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe does not have an adjustment margin.

6. The system according to claim 1, characterized in that, The wind speed adjustment device reduces the opening of the wind speed adjustment actuator corresponding to the powder pipe when the measured wind speed value of the powder pipe is greater than the measured wind speed value of other powder pipes among the powder pipes, the wind speed deviation of the powder pipe is greater than the preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe has an adjustment margin while the other powder pipes do not have an adjustment margin.

7. The system according to claim 1, characterized in that, Also includes: A coal feeder, wherein the coal feed outlet of the coal feeder is connected to the raw coal inlet of the coal mill.

8. The system according to claim 7, characterized in that, Also includes: The raw coal bunker has its outlet connected to the coal feed inlet of the coal feeder.

9. A method for automatically adjusting the outlet wind speed deviation of a coal mill, the method being implemented according to any one of claims 1-8, characterized in that, include: The wind speed inside the powder pipe is measured using the aforementioned wind speed measuring device; The opening signal of the wind speed adjustment actuator is obtained using the wind speed adjustment device, and the adjustment margin state is determined based on the opening signal. The wind speed adjustment device calculates the average value of the wind speed measurement based on the wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average value of the wind speed measurement value. It adjusts the wind speed of the powder pipes based on the comparison results of the wind speed measurement value of the powder pipe with the wind speed measurement values ​​of other powder pipes among the powder pipes, the comparison results of the wind speed deviation of the powder pipe with the preset wind speed deviation, and the adjustment margin state.

10. The method according to claim 9, characterized in that, The wind speed adjustment device calculates the average wind speed measurement value based on the wind speed measurement value, and also calculates the wind speed deviation of each powder pipe based on the average wind speed measurement value. It then adjusts the wind speed of the powder pipes based on a comparison of the wind speed measurement value of the powder pipe with the wind speed measurement values ​​of other powder pipes, a comparison of the wind speed deviation of the powder pipe with a preset wind speed deviation, and an adjustment margin state. This includes: the wind speed adjustment device increases the opening of the wind speed adjustment actuator corresponding to the powder pipe if the wind speed measurement value of the powder pipe is less than the wind speed measurement values ​​of other powder pipes, the wind speed deviation of the powder pipe is greater than the preset wind speed deviation, and the wind speed adjustment actuator of the powder pipe has an adjustment margin.

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