Method and system for improving output of steel ball coal mill based on bypass air optimization

Abstract

The invention belongs to the field of output of steel ball coal mills, and particularly relates to a method and system for improving output of a steel ball coal mill based on bypass air optimization. A wind speed online measuring device is arranged on the coal mill outlet powder pipe, is connected into a DCS (Distributed Control System) and is used for measuring and feeding back the wind speed of the coal mill outlet powder pipe in real time; determining the lower limit and the upper limit of the wind speed of an outlet powder pipe of the coal mill according to the combustion coal type condition of the boiler; a bypass air door optimization test is carried out, and finally the optimal bypass air door opening degree under different coal mill outputs, namely different capacity air door opening degrees is determined; and solidifying the opening degree optimization result of the bypass air door into a DCS (Distributed Control System) to realize automatic optimization adjustment of the bypass air door. According to the method, equipment transformation or complex operation is not needed, and the adjusting mode is simple; the real-time and whole-process control of the output of the steel ball coal mill is realized; according to the method, the cold air mixing amount can be reduced, the exhaust gas temperature rise is reduced, the boiler heat efficiency is improved, and the boiler economy is improved.

Description

Technical Field

[0001] The invention belongs to the field of steel ball coal mill output, and specifically relates to a method for improving the steel ball coal mill output based on bypass wind optimization. Background Art

[0002] Insufficient output of coal mill not only increases the power consumption of the pulverizing system and affects the flexibility of the coal mill operation mode, but also limits the output of the unit. As an important coal pulverizing equipment, steel ball coal mill is widely used in the power industry. For the problem of insufficient output of steel ball coal mill, the more common solutions include appropriately adjusting the fineness of the coarse coal powder, increasing the amount of steel balls to maintain a suitable steel ball specification ratio, anti-wear modification of the coal mill liner, modification of the coal mill dynamic separator, etc. In the actual operation process, these methods and measures have certain lags and complexities, and a method of improving the output of coal mill is needed that is convenient for operators to adjust in real time. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for improving the output of a ball mill based on bypass wind optimization, comprising: arranging an online wind speed measuring device on the powder pipe at the outlet of the coal mill, connecting the device to a DCS system, and measuring and feeding back the wind speed of the powder pipe at the outlet of the coal mill in real time;

[0005] According to the type of coal used in the boiler, determine the lower and upper limits of the wind speed at the outlet powder pipe of the pulverizer;

[0006] Conduct bypass damper optimization tests and ultimately determine the optimal bypass damper opening under different coal mill outputs, i.e. different capacity damper openings;

[0007] The bypass damper opening optimization results are solidified into the DCS control system to achieve automatic optimization adjustment of the bypass damper.

[0008] As a preferred solution of the method for improving the output of a ball mill based on bypass wind optimization described in the present invention, the real-time measurement and feedback of the mill outlet powder pipe wind speed includes: during the boiler shutdown, an online wind speed measuring device is set on the mill outlet powder pipe, the wind speed measuring device is installed on all powder pipes, and each wind speed measurement value is connected to the DCS system to monitor the mill outlet powder pipe wind speed value in real time.

[0009] As a preferred solution of the method for optimizing the output of a ball mill based on bypass wind described in the present invention, wherein: the lower limit and upper limit of the powder pipe wind speed at the outlet of the coal mill are determined, when the primary wind speed of the powder pipe is greater than 18 m / s, a wind speed test is performed to observe the influence on the outlet temperature of the coal mill, the blockage of the powder pipe, and the wall temperature of the water-cooled wall area, and determine the lower limit value V1 of the powder pipe wind speed at the outlet of the coal mill;

[0010] Carry out wind speed test when the primary wind speed of powder pipe is less than 30m / s to observe the influence on coal mill outlet temperature, combustible content of fly ash and NOx concentration, and determine the upper limit value V2 of wind speed of powder pipe at coal mill outlet.

[0011] As a preferred scheme of the method for improving the output of a ball mill based on bypass air optimization described in the present invention, the bypass damper optimization test includes optimizing the bypass damper opening under different mill outputs, i.e., different capacity damper openings, i.e., closing the bypass damper, while ensuring that the real-time wind speed measured online at the powder pipe at the mill outlet is greater than the set lower wind speed limit V1.

[0012] As a preferred solution of the method for improving the output of a ball mill based on bypass wind optimization described in the present invention, wherein: the said solidifying the bypass damper opening optimization result into the DCS control system includes, in the DCS control system, adding a control component for controlling the capacity damper opening and the bypass damper opening, and at the same time connecting the online primary wind speed measurement value at the mill outlet and the mill outlet temperature value to the control component.

[0013] As a preferred solution of the method for improving the output of a ball mill based on bypass air optimization described in the present invention, the optimal bypass damper opening includes: according to the type of coal burned, the outlet temperature of the coal mill generally has a corresponding recommended range, namely, a lower limit value T1 and an upper limit value T2. When the bypass damper is closed, the outlet temperature of the coal mill will be reduced. The bypass damper is gradually closed until the outlet temperature of the coal mill is close to the lower limit value T2 of the recommended range, and there is no obvious effect on the parameters related to boiler combustion, then the capacity damper is opened to the optimal bypass damper opening;

[0014] Under different capacity damper openings, bypass damper opening optimization tests are carried out to determine the bypass damper openings that match different coal mill outputs, i.e., different capacity damper openings.

[0015] As a preferred solution of the method for improving the output of a ball mill based on bypass air optimization described in the present invention, wherein: the automatic optimization adjustment of the bypass damper includes solidifying the optimized bypass damper opening results under different capacity damper openings into the DCS control system, and during the daily operation of the boiler, according to the boiler load requirements, when the capacity damper is opened to a certain opening, the bypass damper can be automatically matched to the optimized opening, thereby realizing automatic optimization control of the bypass damper;

[0016] When the coal quality changes and the online primary wind speed at the coal mill outlet is lower than the lower limit value T1 or the coal mill outlet temperature is lower than the lower limit value T1, the control component automatically opens the bypass damper to optimize the original matching value.

[0017] As a preferred solution of the system for improving the output of a ball mill based on bypass wind optimization described in the present invention, it includes: a wind speed monitoring module, a wind speed limit setting module, a damper optimization test module module, and a damper automatic optimization module;

[0018] The wind speed monitoring module is provided with a wind speed online measuring device on the coal mill outlet powder pipe, which is connected to the DCS system for real-time measurement and feedback of the wind speed of the coal mill outlet powder pipe;

[0019] The wind speed limit setting module determines the lower limit and upper limit of the wind speed of the powder pipe at the outlet of the pulverizer according to the type of coal burned in the boiler;

[0020] The damper optimization test module carries out bypass damper optimization test, and finally determines the optimal bypass damper opening under different coal mill outputs, i.e., different capacity damper openings;

[0021] The damper automatic optimization module solidifies the bypass damper opening optimization result into the DCS control system to realize automatic optimization and adjustment of the bypass damper.

[0022] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of any one of the methods for optimizing the output of a ball mill based on bypass wind are implemented.

[0023] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the methods for optimizing the output of a ball mill based on bypass wind are implemented.

[0024] Beneficial effects of the present invention: The present invention aims to tap the potential of the existing primary air system and pulverizing system through the optimization of the bypass damper, and to improve the output of the coal mill when the output of the primary fan is limited. Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the method does not require equipment modification or complex operations, and the adjustment method is simple; the method has a flexible adjustment method, which is convenient for real-time adjustment, can reduce the workload of manual adjustment by the operating personnel, and realize real-time and full-process control of the output of the ball mill; at the same time, the method can reduce the amount of cold air mixed in, reduce the rise in exhaust gas temperature, improve the thermal efficiency of the boiler, and improve the economy of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 A flow chart of a method for improving the output of a ball mill based on bypass air optimization is provided as an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0028] Example 1

[0029] Reference Figure 1 , which is the first embodiment of the present invention, and provides a method for improving the output of a ball mill based on bypass wind optimization, such as Figure 1 As shown, including:

[0030] The air volume passing through the ball mill system includes capacity air and bypass air. The main function of capacity air is to dry the raw coal and carry coal powder. The air volume of capacity air is proportional to the output of the coal mill. During daily operation, the real-time output of the coal mill is adjusted by adjusting the opening of the capacity air door. The main function of bypass air is to pre-dry the raw coal and ensure the wind speed of the powder pipe at the outlet of the coal mill. In actual operation, in order to prevent the powder pipe wind speed from being too low and causing coal powder to deposit and block the mill, the operating personnel are accustomed to opening the bypass air door. If the bypass air door is too large, it will lead to an increase in the amount of cold air mixed into the coal mill inlet. On the one hand, this will increase the exhaust gas temperature and reduce the economy of the boiler; on the other hand, opening the bypass air door too large will lead to a decrease in the primary air pressure at the coal mill inlet, thereby reducing the output capacity of the coal mill. Under normal circumstances, the output of the coal mill can be increased by increasing the capacity air volume by opening a large capacity damper. However, when the quality of the boiler coal deteriorates, the amount of coal entering the furnace increases, and the primary fan output has reached the maximum state, opening a large capacity damper can no longer further increase the capacity air volume, and the output of the coal mill cannot be improved. At this time, in order to further improve the output of the coal mill through real-time adjustment methods, the bypass damper can be optimized. In order to achieve the purpose of improving the output capacity of the ball mill by optimizing the bypass damper, the present invention adopts the following technical scheme: a method for improving the output of a ball mill based on bypass wind optimization, the method comprising the following steps:

[0031] S1. An online wind speed measuring device is installed on the powder pipe at the coal mill outlet and connected to the DCS system for real-time measurement and feedback of the wind speed at the powder pipe at the coal mill outlet.

[0032] S2. Determine the lower and upper limits of the pulverizer outlet powder pipe wind speed based on the type of coal burning in the boiler.

[0033] S3. Carry out bypass damper optimization test to finally determine the reasonable bypass damper opening under different coal mill outputs, i.e. different capacity damper openings.

[0034] S4. Solidify the bypass damper opening optimization result into the DCS control system to realize automatic optimization adjustment of the bypass damper.

[0035] Furthermore, in step S1, during the boiler shutdown period, an online wind speed measuring device is provided on the powder pipe at the coal mill outlet. The wind speed measuring device is preferably installed on all powder pipes, and each wind speed measurement value is connected to the DCS system to facilitate the operating personnel to monitor the wind speed value of the powder pipe at the coal mill outlet in real time.

[0036] Further, in step S2, when the boiler is running in hot state, a wind speed test is carried out on some coal mills to determine the lower limit V1 and upper limit V2 of the wind speed of the powder tube at the outlet of the coal mill. According to relevant standards, the minimum wind speed of the powder tube cannot be lower than 18m / s, otherwise the coal powder in the powder tube will have the risk of deposition and blockage. At the same time, if the wind speed is too low, the coal powder will catch fire at the burner nozzle, and the flame rigidity is insufficient, it is easy to burn against the wall, increase the heat load of the water-cooled wall area, and cause the local water-cooled wall temperature to rise. The maximum wind speed of the powder tube should not be higher than 30m / s. If the wind speed is too high, it will not only increase the power consumption of the primary fan, but also cause wear on the powder tube and burner, and at the same time, the ignition point will be far away from the burner nozzle. During the low load or deep peak regulation of the unit, the stable combustion ability of the boiler will decrease, affecting the operation safety. When the primary wind speed of the powder pipe is greater than 18m / s, the wind speed test is carried out to observe the influence on the outlet temperature of the coal mill, the blockage of the powder pipe, the wall temperature of the water-cooled wall area, etc., and determine the appropriate lower limit value V1 of the wind speed of the powder pipe at the outlet of the coal mill. When the primary wind speed of the powder pipe is less than 30m / s, the wind speed test is carried out to observe the influence on the outlet temperature of the coal mill, the combustible content of fly ash, the NOx concentration, etc., and determine the appropriate upper limit value V2 of the wind speed of the powder pipe at the outlet of the coal mill.

[0037] Furthermore, in step S3, under different coal mill outputs, i.e., different capacity damper openings, the bypass damper opening is optimized, i.e., the bypass damper is closed, and at the same time, it is ensured that the real-time wind speed measured online by the powder pipe at the coal mill outlet is greater than the wind speed lower limit V1 set in step S2. According to the type of coal burned, the outlet temperature of the coal mill generally has a corresponding recommended range, i.e., the lower limit T1 and the upper limit T2. By closing the bypass damper, the outlet temperature of the coal mill will be reduced. The bypass damper is gradually closed until the outlet temperature of the coal mill is close to the lower limit of the recommended range, and other parameters related to boiler combustion have no obvious effect, i.e., the optimal bypass damper opening under the capacity damper is opened. By analogy, under different capacity damper openings, the bypass damper opening optimization test is carried out to determine the bypass damper opening that matches different coal mill outputs, i.e., different capacity damper openings. By closing the bypass damper, the pressure of the primary air main pipe can be increased when the output of the primary fan is limited, thereby improving the output capacity of the coal mill.

[0038] Furthermore, in step S4, a control component is added to the DCS control system to control the capacity damper opening and the bypass damper opening, and the online primary wind speed measurement value at the coal mill outlet and the coal mill outlet temperature value are connected to the control component. The optimized bypass damper opening results under different capacity damper openings obtained in step S3 are solidified into the DCS control system. During daily operation of the boiler, according to the boiler load requirements, when the capacity damper is opened to a certain opening, the bypass damper can automatically match the optimized opening, thereby realizing automatic optimization control of the bypass damper. When the coal quality changes, causing the online primary wind speed at the coal mill outlet to be lower than the lower limit value T1 of the wind speed or the coal mill outlet temperature to be lower than the lower limit value T1, the control component can also automatically increase the bypass damper opening to optimize the original matching value. This step can reduce the workload of manual adjustment by the operating personnel, and at the same time realize the real-time improvement of the coal mill output.

[0039] Embodiment 2 is the second embodiment of the present invention, which provides a method for improving the output of a ball mill based on bypass wind optimization.

[0040] A 600MW coal-fired unit is equipped with 5 BBD3854 double-inlet and double-outlet ball mills. The mills have insufficient output. Even if the fineness of the coal powder is increased and the combustible content of the fly ash has increased, the maximum output of the five mills is about 285t / h to 290t / h. During summer operation, the output of the primary fan has reached the maximum state, and the output of the mill is limited, which directly affects the load-carrying capacity of the unit.

[0041] A total of 20 sets of electrostatic sensors were installed on the straight sections of each primary air duct at the coal mill outlet, realizing online monitoring of parameters such as the primary air velocity of each powder pipe. On the basis of taking into account safety and economy, the lower limit of the primary air velocity of the powder pipe at the coal mill outlet was set to 20m / s. In order to determine the appropriate bypass damper opening under different coal mill outputs, the bypass damper damper opening optimization test was carried out on coal mills B and C.

[0042] Table 1 Coal mill bypass damper opening test

[0043]

[0044]

[0045] From the bypass damper opening optimization test results, we can see that:

[0046] When the capacity damper opening of B coal mill is 40%, when the bypass air opening is closed from 27% to 15%, the primary air pressure at the coal mill inlet increases from 10.72kPa to 11.13kPa, and the coal mill output increases by 2t / h, effectively improving the output of the pulverizing system; the cold primary air damper opening is closed from 66% to 57%, the coal mill inlet air temperature increases from 201℃ to 230℃, the amount of cold air added is reduced, and the economy of the boiler is improved; the powder pipe wind speed is reduced from 25.3m / s to 22.5m / s, which is higher than the lower limit of the powder pipe wind speed. It is within a reasonable range and there will be no problems such as coal powder deposition.

[0047] When the capacity damper opening of C coal mill is 50%, when the bypass air opening is closed from 25% to 10%, the primary air pressure at the coal mill inlet increases from 10.35kPa to 11.54kPa, and the coal mill output increases by 4t / h, effectively improving the output of the pulverizing system; the cold primary air damper opening is closed from 46% to 37%, the coal mill inlet air temperature increases from 231℃ to 251℃, the amount of cold air added is reduced, and the economy of the boiler is improved; the powder tube wind speed is reduced from 24.0m / s to 21.5m / s, which is higher than the lower limit of the powder tube wind speed. It is within a reasonable range and there will be no problems such as coal powder deposition.

[0048] Under normal operation mode, the bypass damper opening is about 25% to 35%. Under this condition, the cold primary damper opening is about 40% to 60%, and the primary air temperature at the mill inlet is about 200℃ to 230℃. This not only reduces the economy of the boiler, but also leads to a decrease in the primary air pressure at the mill inlet, limiting the output of the mill, thus affecting the load capacity of the unit. Through the mill bypass damper opening test, it can be seen that the bypass damper opening has a large optimization space. Without the mill output modification, the mill output can be effectively improved by adjusting the operation mode.

[0049] After the test, the bypass air damper optimization test results in Table 2 were solidified in the DCS control system, thus achieving real-time and full-process control of the ball mill output improvement. After optimization, the total output of the five coal mills can be increased by about 15t / h, which can fully meet the load capacity requirements of the unit under the current coal quality.

[0050] Table 2 Recommended settings for bypass damper opening at different capacity damper openings

[0051]

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0053] Example 3

[0054] The third embodiment of the present invention is different from the first two embodiments in that:

[0055] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0056] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0057] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0058] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0059] Example 4

[0060] A fourth embodiment of the present invention provides a system for improving the output of a ball mill based on bypass wind optimization, characterized in that it includes a wind speed monitoring module, a wind speed limit setting module, a damper optimization test module, and a damper automatic optimization module;

[0061] The wind speed monitoring module is provided with a wind speed online measuring device on the coal mill outlet powder pipe, which is connected to the DCS system for real-time measurement and feedback of the wind speed of the coal mill outlet powder pipe;

[0062] The wind speed limit setting module determines the lower limit and upper limit of the wind speed of the powder pipe at the outlet of the pulverizer according to the type of coal burned in the boiler;

[0063] The damper optimization test module carries out bypass damper optimization test, and finally determines the optimal bypass damper opening under different coal mill outputs, i.e., different capacity damper openings;

[0064] The damper automatic optimization module solidifies the bypass damper opening optimization result into the DCS control system to realize automatic optimization and adjustment of the bypass damper.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for improving the output of a ball mill based on bypass wind optimization, characterized in that: include, An online wind speed measuring device is installed at the outlet powder pipe of the coal mill, which is connected to the DCS system to measure and feedback the wind speed of the outlet powder pipe of the coal mill in real time; According to the type of coal used in the boiler, determine the lower and upper limits of the wind speed at the outlet powder pipe of the pulverizer; Conduct bypass damper optimization tests to determine the optimal bypass damper opening for different coal mill outputs; The optimal bypass damper opening result is solidified into the DCS control system to achieve automatic optimization adjustment of the bypass damper.

2. The method for optimizing the output of a ball mill based on bypass air as claimed in claim 1, characterized in that: The real-time measurement and feedback of the coal mill outlet powder pipe wind speed includes: during the boiler shutdown, an online wind speed measuring device is set on the coal mill outlet powder pipe, the wind speed measuring device is installed on all powder pipes, each wind speed measurement value is connected to the DCS system, and the coal mill outlet powder pipe wind speed value is monitored in real time.

3. A method for optimizing the output of a ball mill based on bypass wind as claimed in claim 2, characterized in that: Determining the lower limit and upper limit of the powder pipe wind speed at the coal mill outlet includes conducting a wind speed test when the powder pipe primary wind speed is greater than 18 m / s, observing the influence on the coal mill outlet temperature, powder pipe blockage, and wall temperature of the water-cooled wall area, and determining the lower limit value V1 of the powder pipe wind speed at the coal mill outlet; Carry out wind speed test when the primary wind speed of powder pipe is less than 30m / s to observe the influence on coal mill outlet temperature, combustible content of fly ash and NOx concentration, and determine the upper limit value V2 of wind speed of powder pipe at coal mill outlet.

4. A method for optimizing and improving the output of a ball mill based on bypass wind as claimed in claim 3, characterized in that: The bypass damper optimization test includes optimizing the bypass damper opening at different coal mill outputs to ensure that the real-time wind speed measured online at the coal mill outlet powder pipe is greater than a set wind speed lower limit value V1.

5. The method for optimizing the output of a ball mill based on bypass air as claimed in claim 4, characterized in that: The method of solidifying the bypass damper opening optimization result into the DCS control system includes adding a control component in the DCS control system to control the capacity damper opening and the bypass damper opening, and connecting the online primary wind speed measurement value at the coal mill outlet and the coal mill outlet temperature value to the control component.

6. A method for optimizing and improving the output of a ball mill based on bypass wind as claimed in claim 5, characterized in that: The optimal bypass damper opening includes, according to the type of coal burned, the corresponding recommended range of the coal mill outlet temperature, i.e., the lower limit value T1 and the upper limit value T2, closing the bypass damper, the coal mill outlet temperature decreases, the bypass damper is gradually closed until the coal mill outlet temperature is close to the lower limit value T2 of the recommended range, and the parameters related to boiler combustion have no obvious effect, then the capacity damper is opened to the optimal bypass damper opening; Under different capacity damper openings, bypass damper opening optimization tests are carried out to determine the bypass damper openings that match different coal mill outputs, i.e., different capacity damper openings.

7. A method for optimizing the output of a ball mill based on bypass air as claimed in claim 6, characterized in that: The automatic optimization adjustment of the bypass damper includes: solidifying the optimized bypass damper opening results under different capacity damper openings into the DCS control system; during the daily operation of the boiler, when the capacity damper is opened to the first opening according to the boiler load requirements, the bypass damper is automatically matched to the optimized opening, thereby realizing automatic optimization control of the bypass damper; When the coal quality changes and the online primary wind speed at the coal mill outlet is lower than the lower limit value T1 or the coal mill outlet temperature is lower than the lower limit value T1, the control component automatically opens the bypass damper to optimize the original matching value.

8. A system for optimizing the output of a ball mill based on bypass wind according to any one of claims 1 to 7, characterized in that: Including wind speed monitoring module, wind speed limit setting module, damper optimization test module, damper automatic optimization module; The wind speed monitoring module is provided with a wind speed online measuring device on the coal mill outlet powder pipe, which is connected to the DCS system for real-time measurement and feedback of the wind speed of the coal mill outlet powder pipe; The wind speed limit setting module determines the lower limit and upper limit of the wind speed of the powder pipe at the outlet of the pulverizer according to the type of coal burned in the boiler; The damper optimization test module carries out bypass damper optimization test, and finally determines the optimal bypass damper opening under different coal mill outputs, i.e., different capacity damper openings; The damper automatic optimization module solidifies the bypass damper opening optimization result into the DCS control system to realize automatic optimization and adjustment of the bypass damper.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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