A method, system, device, medium and product for evaluating the output characteristics of a medium-speed coal mill

Abstract

The application discloses a medium-speed coal mill output characteristic evaluation method, system, equipment, medium and product, including: correcting the actual maximum output of the coal mill by using the correction coefficient of the coal mill output, obtaining the theoretical maximum output of the coal mill; establishing a coal mill output characteristic evaluation early warning factor according to the theoretical maximum output of the coal mill and the design maximum output of the coal mill; when the coal mill output characteristic evaluation early warning factor is less than a set value, analyzing the reason for the low output of the coal mill, and calculating the service time of the coal mill roller. The application can evaluate the running state of the coal mill according to the output characteristics of the coal mill by correcting the actual maximum output of the coal mill and establishing the coal mill output characteristic evaluation early warning factor, give corresponding operation and maintenance suggestions according to the running state of the coal mill, give a warning signal when the output of the coal mill deviates from the design by a large margin, analyze the reason for the reduction of the output of the coal mill, predict the service time of the coal mill roller, and provide a reference for operation and maintenance personnel.

Description

Technical Field

[0001] The present application belongs to the technical field of coal mill performance evaluation, and relates to a method, system, equipment, medium and product for evaluating the output characteristics of a medium-speed coal mill. Background Art

[0002] Power plant coal mills, which crush coal lumps and grind them into pulverized coal, are core equipment in boiler combustion and pulverizing systems. Any malfunction in the mills directly impacts the safe and stable operation of the units, and their operating conditions have a significant impact on the safety and economic efficiency of the entire power plant system. The actual coal quality used in the power plant deviates significantly from the designed coal quality, leading to poor operating conditions in the mills. This leads to rapid wear of grinding components such as the mill rollers and grinding discs, reducing mill output and limiting the unit's load capacity, impacting the safe and stable operation of the units.

[0003] The output of the coal mill is affected by coal quality, ventilation output, drying output, and grinding output. Currently, there is no effective method to evaluate the output characteristics of the coal mill. When the coal mill output decreases, it is impossible to determine the cause of the decrease and to carry out targeted work to improve the coal mill output. It is necessary to carry out an evaluation of the output characteristics of the coal mill. When the coal mill output deviates significantly from the design value, it is necessary to promptly remind power plant personnel to carry out operation optimization and maintenance to improve the coal mill output. Summary of the Invention

[0004] The purpose of this application is to solve the problems in the prior art and to provide a method, system, equipment, medium and product for evaluating the output characteristics of a medium-speed coal mill.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for evaluating the output characteristics of a medium-speed coal mill, comprising the following steps:

[0007] The actual maximum output of the coal mill is corrected using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill;

[0008] According to the theoretical maximum output and the designed maximum output of the coal mill, establish the coal mill output characteristic assessment and early warning factor;

[0009] When the early warning factor of the coal mill output characteristic evaluation is less than the set value, the reason for the low coal mill output is analyzed and the service life of the coal mill roller is predicted.

[0010] In a second aspect, the present application provides a medium-speed coal mill output characteristic evaluation system, comprising:

[0011] The maximum output correction module is used to correct the actual maximum output of the coal mill using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill;

[0012] An early warning factor establishment module is used to establish an early warning factor for evaluating the output characteristics of a coal mill based on the theoretical maximum output of the coal mill and the designed maximum output of the coal mill;

[0013] The analysis and calculation module is used to analyze the reasons for the low output of the coal mill and predict the service life of the coal mill roller when the early warning factor of the coal mill output characteristic evaluation is less than the set value.

[0014] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0015] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0016] In a fifth aspect, the present application provides a computer program product, which includes computer instructions. A processor of a computer device reads the computer instructions, and the processor of the computer device executes the computer instructions to implement the steps of the above method.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] This application corrects the actual maximum output of the coal mill and establishes a coal mill output characteristic evaluation and warning factor. It can evaluate the operating status of the coal mill according to the coal mill output characteristics, and give corresponding operation and maintenance suggestions based on the coal mill operating status. When the coal mill output deviates significantly from the design, an early warning signal is given, and the reasons for the reduction in coal mill output are analyzed. The service life of the coal mill roller is predicted for reference by operation and maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Flowchart of the present application method.

[0021] Figure 2 Schematic diagram of the evaluation method for this application.

[0022] Figure 3 The schematic diagram of the system of the present application is shown in FIG. 1. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0024] Therefore, the detailed description of the embodiments of the present application provided below in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0025] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0026] In the description of the embodiments of the present application, it should be noted that: if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0028] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in this application based on specific circumstances.

[0029] The present application is described in further detail below with reference to the accompanying drawings:

[0030] See also Figure 1 The embodiment of the present application discloses a method for evaluating the output characteristics of a medium-speed coal mill, comprising the following steps:

[0031] S1 uses the correction coefficient of the coal mill output to correct the actual maximum output of the coal mill to obtain the theoretical maximum output of the coal mill;

[0032] S2 establishes an early warning factor for coal mill output characteristic assessment based on the theoretical maximum output of the coal mill and the designed maximum output of the coal mill;

[0033] When the early warning factor of the coal mill output characteristic evaluation is less than the set value, S3 analyzes the reason for the low coal mill output and calculates the service life of the coal mill roller.

[0034] like Figure 2 As shown, in a feasible embodiment, the present application provides a method for evaluating the output characteristics of a medium-speed coal mill, comprising the following steps:

[0035] Step 1: Obtain the actual maximum output B of the coal mill through testing MO The coal used in the coal mill test is the daily coal used by the unit. The coal feed rate of the coal mill is gradually increased. When the primary air volume at the coal mill inlet decreases, the differential pressure of the grinding bowl increases, and there are signs of grinding blockage, the coal feed rate is the actual maximum output of the coal mill B. MO .

[0036] Step 2: Input coal quality parameters: raw coal Hardgrove grindability index HGI, coal powder fineness R 90 , raw coal moisture M t 、Raw coal ash content A ar .

[0037] Step 3: Calculate the theoretical maximum output B of the coal mill after coal quality correction M :

[0038] B M =B MO / f H / f R / fM / f A

[0039] Wherein, B M is the theoretical maximum output of the coal mill, t / h; B MO is the actual maximum output of the coal mill, t / h; f H is the correction coefficient of the grindability of raw coal to the output of the coal mill; f R is the correction coefficient of the fineness of pulverized coal to the output of the coal mill; f M is the correction coefficient of the moisture of raw coal to the output of the coal mill; f A is the correction coefficient of the ash content of raw coal to the output of the coal mill.

[0040] Step 4, the correction coefficient f H

[0041] For MPS type and ZGM type medium-speed coal mills,

[0042] For HP type medium-speed coal mills,

[0043] Step 5, the correction coefficient f R

[0044] For MPS type and ZGM type medium-speed coal mills,

[0045] For HP type medium-speed coal mills,

[0046] Step 6, the correction coefficient f M

[0047] For MPS type and ZGM type medium-speed coal mills, M t ≤10%, f M =1; M t >10%, f M =1+(10-M t )×0.0114

[0048] For HP type medium-speed coal mills, M t ≤12%, f M =1; M t >12%, f M =1+(12-M t )×0.0125

[0049] Step 7, the correction coefficient f A

[0050] Aar When ≤20%, f A =1;A ar When f A =1+(20-A ar )×0.005

[0051] Step 8: Establish coal mill output characteristic evaluation warning factor X = B M / B (B: maximum designed output of the coal mill), different warning levels are given according to X to remind operating personnel to adjust parameters in time and maintenance personnel to repair the coal mill.

[0052]

[0053]

[0054] When the coal mill output characteristic evaluation warning factor X is less than 1.0, the reasons for the low coal mill output are analyzed from four aspects: coal quality, ventilation output, drying output, and grinding output.

[0055] (1) Establish a coal quality and mill output function model to give the impact of coal quality on mill output.

[0056] f H 、f R 、f M 、f A Composition set f i ={f H ,f R ,f M ,f A}, use bubble sorting to sort and get the minimum value f min , according to f min Give different warning levels, when f min When it is less than 0.85, remind the operator to adjust f min Corresponding coal quality parameters.

[0057] <![CDATA[煤质影响因子f min ]]> Warning level 0.95～1.0 General (yellow) 0.85～0.95 Moderate (red) Less than 0.85 Heavy (brown)

[0058] (2) Determine whether the ventilation output is normal.

[0059] When the coal mill reaches its actual maximum output B MO When the fan opening is greater than 95%, the ventilation output is judged to be insufficient; when the fan opening is less than 95%, the ventilation output is judged to be normal.

[0060] (3) Determine whether the drying output is normal.

[0061] When the coal mill reaches its actual maximum output B MOWhen the temperature of the coal mill outlet is lower than 60℃, the drying output is judged to be insufficient; when the temperature of the coal mill outlet is higher than 60℃, the drying output is judged to be normal.

[0062] (4) When the coal quality, ventilation output and drying output are normal, it is judged that the grinding output is insufficient and the coal mill should be overhauled in time.

[0063] Step 9: Predict the service life of the coal mill roller.

[0064] When the coal mill output characteristic evaluation warning factor X is greater than 1.0, the coal mill roller can be used for a long time.

[0065] When the coal mill output characteristic evaluation warning factor X is less than 1.0, the coal mill roller service time t is predicted:

[0066] t=0.2×Δt / (1-X)

[0067] Among them, t is the service life of the coal mill roller, and Δt is the operating time of the coal mill after the new grinding roller is replaced.

[0068] like Figure 3 As shown, the embodiment of the present application provides a medium-speed coal mill output characteristic evaluation system, comprising:

[0069] The maximum output correction module is used to correct the actual maximum output of the coal mill using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill;

[0070] An early warning factor establishment module is used to establish an early warning factor for evaluating the output characteristics of a coal mill based on the theoretical maximum output of the coal mill and the designed maximum output of the coal mill;

[0071] The analysis and calculation module is used to analyze the reasons for the low output of the coal mill and calculate the service life of the coal mill roller when the early warning factor of the coal mill output characteristic evaluation is less than the set value.

[0072] One embodiment of the present application provides a computer device. The computer device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of each of the above-described method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in each of the above-described apparatus embodiments are implemented.

[0073] The computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present application.

[0074] The computer device can be a desktop computer, a notebook computer, a palm computer, a cloud server, and the like. The computer device can include, but is not limited to, a processor and a memory.

[0075] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.

[0076] The memory can be used to store the computer program and / or modules, and the processor can realize various functions of the computer device by running or executing the computer program and / or modules stored in the memory, and calling data stored in the memory.

[0077] The modules / units integrated in the computer device, if realized in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of the above-mentioned various method embodiments can be realized. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

[0078] The present application also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs Figure 1 The methods provided in the various optional methods are therefore not described in detail here.

[0079] The terms "first", "second", etc. in the description, claims, and drawings of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device comprising a series of steps or units is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other step units inherent to these processes, methods, apparatuses, products, or devices.

[0080] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0081] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in this description according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0082] The methods and related devices provided in the embodiments of the present application are described with reference to the method flow charts and / or structural diagrams provided in the embodiments of the present application. Specifically, each process and / or block in the method flow charts and / or structural diagrams, as well as the combination of processes and / or blocks in the flow charts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable device to generate a machine, so that the instructions executed by the processor of the computer or other programmable device generate instructions for implementing the steps in the process. Figure 1 Schematic diagram of one or more processes and / or structures Figure 1 These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device, or are transmitted through a computer-readable storage medium. Computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The instruction device is implemented in the process Figure 1 Schematic diagram of one or more processes and / or structures Figure 1 These computer program instructions can also be loaded onto a computer or other programmable device so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 The flow or flows and / or structures illustrate the steps of the functions specified in one block or multiple blocks.

[0083] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0084] The modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0085] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A method for evaluating the output characteristics of a medium-speed coal mill, characterized in that: The following steps are involved: The actual maximum output of the coal mill is corrected using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill; Actual maximum output of coal mill The test was carried out as follows: The coal used in the pulverizer test is the daily coal used by the unit. The coal feed rate of the pulverizer is gradually increased. When the primary air volume at the pulverizer inlet decreases, the differential pressure of the grinding bowl increases, and there are signs of clogging, the coal feed rate is the actual maximum output of the pulverizer. ; The actual maximum output of the coal mill is corrected using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill. ,include: in, The correction coefficient of raw coal grindability on coal mill output; The correction coefficient of coal powder fineness on the output of coal mill; The correction coefficient of raw coal moisture on coal mill output; is the correction coefficient of raw coal ash content on coal mill output; According to the theoretical maximum output and the designed maximum output of the coal mill, establish the coal mill output characteristic assessment and early warning factor; Early warning factors for coal mill output characteristics evaluation as follows: in, Design the maximum output for the coal mill; when When it is greater than or equal to 1.0, the warning level is normal; when When it is greater than or equal to 0.9 and less than 1.0, the warning level is general; when When it is greater than or equal to 0.8 and less than 0.9, the warning level is moderate; when When it is less than 0.8, the warning level is severe; When the coal mill output characteristic evaluation warning factor is less than the set value, analyze the reasons for the low coal mill output and predict the service life of the coal mill roller; when When it is less than 1.0, the predicted service life of the coal mill roller includes: in, The service life of the coal mill roller, It is the running time of coal mill after the grinding roller is newly replaced.

2. The method for evaluating the output characteristics of a medium-speed coal mill according to claim 1, wherein: (1) Correction coefficient of raw coal grindability on mill output : For MPS and ZGM medium-speed coal mills: For HP medium speed coal mill: in, is the Hardgrove grindability coefficient of raw coal; (2) Correction coefficient of coal powder fineness on mill output : For MPS and ZGM medium-speed coal mills: For HP medium speed coal mill: in, is the fineness of coal powder; (3) Correction coefficient of raw coal moisture on mill output : For MPS and ZGM medium speed coal mills, hour, ; hour, ; For HP medium speed coal mill, hour, ; hour, ; in, is the moisture content of raw coal; (4) Correction coefficient of raw coal ash content on mill output : hour, ; hour, ; in, Ash content of raw coal.

3. The method for evaluating the output characteristics of a medium-speed coal mill according to claim 1, wherein: When the coal mill output characteristic evaluation warning factor is less than the set value, analyze the reasons for the low coal mill output, including: Analysis of the reasons for low coal mill output includes analyzing the reasons from four aspects: coal quality, ventilation output, drying output, and grinding output. The details are as follows: (1) Reasons for low mill output based on coal quality analysis: Establish a coal quality and coal mill output function model to give the effect of coal quality on coal mill output; Will 、 、 、 Composition Collection , sorted by bubble sorting method, and the minimum value of coal quality influencing factor was obtained , according to the coal quality influencing factors Give different warning levels, when coal quality factors When it is less than 0.85, adjust the coal quality impact factor Corresponding coal quality parameters; when When it is greater than or equal to 0.95 and less than 1.0, the corresponding warning level is general; when When it is greater than or equal to 0.85 and less than 0.95, the corresponding warning level is moderate; when When it is less than 0.85, the corresponding warning level is severe; (2) Analyze the reasons for low coal mill output from the perspective of ventilation output: When the coal mill reaches its maximum output When the fan opening is greater than or equal to 95%, the ventilation output is judged to be insufficient; if the fan opening is less than 95%, the ventilation output is judged to be normal. (3) Analysis of the reasons for low coal mill output from the perspective of drying output: When the coal mill reaches its maximum output When the temperature of the coal mill outlet is less than or equal to 60℃, the drying output is judged to be insufficient; when the temperature of the coal mill outlet is greater than 60℃, the drying output is judged to be normal. (4) Analyze the reasons for low coal mill output from the perspective of grinding output: When the coal quality, ventilation output and drying output are normal, it is judged that the grinding output is insufficient.

4. A medium-speed coal mill output characteristic evaluation system, used to implement the medium-speed coal mill output characteristic evaluation method according to any one of claims 1 to 3, characterized in that: include: The maximum output correction module is used to correct the actual maximum output of the coal mill using the correction coefficient of the coal mill output to obtain the theoretical maximum output of the coal mill; An early warning factor establishment module is used to establish an early warning factor for evaluating the output characteristics of a coal mill based on the theoretical maximum output of the coal mill and the designed maximum output of the coal mill; The analysis and calculation module is used to analyze the reasons for the low output of the coal mill and predict the service life of the coal mill roller when the early warning factor of the coal mill output characteristic evaluation is less than the set value.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium storing a computer program, 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 3 are implemented.

7. A computer program product, characterized in that The computer program product includes computer instructions. A processor of a computer device reads the computer instructions, and the processor of the computer device executes the computer instructions to implement the steps of the method according to any one of claims 1 to 3.

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