Coal-fired power plant static separator regulation and control method and device, terminal and medium

Abstract

The invention discloses a coal-fired power plant static separator regulation and control method and device, a terminal and a medium. According to the technical scheme, for a modified static separator additionally provided with an electric actuator, firstly, opening parameters of the actuator are initialized according to a baffle of the static separator and the opening parameter range of the actuator; according to the method, the opening parameters of the actuator are sequentially adjusted according to the preset opening adjusting logic, the baffle opening degrees corresponding to the different actuator opening degrees are recorded, and therefore the opening degree corresponding relation between the actuator opening degrees and the baffle opening degrees is obtained, and the control accuracy of the actuator is determined based on the opening degree corresponding relation. The reliability of pulverized coal separation of the static separator can be improved.

Description

Technical Field

[0001] This application relates to the technical field of thermal power generation, and particularly to a regulation and control method, device, terminal and medium for a static separator in a coal-fired power plant. Background Technique

[0002] The static separator is a key device in the coal pulverizing system of a coal-fired power plant, mainly used to separate the pulverized coal after being milled by the coal mill according to the particle size, ensure that the pulverized coal meeting the combustion requirements enters the furnace, and the coarser pulverized coal returns to the coal mill for re-milling.

[0003] The traditional static separator needs to be adjusted manually on-site. However, due to the large adjustment workload and poor on-site environment, it is difficult to effectively adjust the economic fineness of the pulverized coal. In view of the problems existing in the traditional static separator, a transformation plan for the traditional static separator has been proposed. Specifically, an electric actuator is installed on the basis of the structure of the static separator, and the opening of the baffle of the static separator is adjusted by the actuator, which improves the adjustment convenience and operation efficiency of the static separator to a certain extent. However, in the actual application process, there is a technical problem of inaccurate pulverized coal separation. Summary of the Invention

[0004] This application provides a regulation and control method, device, terminal and medium for a static separator in a coal-fired power plant, which is used to solve the technical problem of inaccurate pulverized coal separation existing in the existing static separator.

[0005] To solve the above technical problem, the first aspect of this application provides a regulation and control method for a static separator in a coal-fired power plant, including:

[0006] Responding to a static separator regulation test instruction, initializing the opening parameter of the actuator;

[0007] Adjusting the opening parameter of the actuator in sequence through a preset opening adjustment logic, and recording the corresponding baffle opening for different actuator openings to obtain the corresponding relationship between the actuator opening and the baffle opening;

[0008] Determining the test result of the opening adjustment accuracy of the static separator according to the corresponding relationship.

[0009] Preferably, initializing the opening parameter of the actuator includes:

[0010] According to the range of the opening parameter of the actuator, initializing the opening parameter of the actuator with one of the maximum and minimum values of the range of the opening parameter.

[0011] Preferably, adjusting the opening parameter of the actuator in sequence through a preset opening adjustment logic, and recording the corresponding baffle opening for different actuator openings to obtain the corresponding relationship between the actuator opening and the baffle opening includes:

[0012] Adjust the opening parameter of the actuator step by step according to the preset opening adjustment step, so that the initial value of the opening parameter of the actuator is gradually adjusted to another extreme value;

[0013] Record the baffle opening corresponding to different actuator openings to obtain the corresponding relationship between the actuator opening and the baffle opening.

[0014] Preferably, according to the corresponding relationship of the openings, determining the opening adjustment accuracy test result of the static separator includes:

[0015] Determine the synchronization state of the actuator opening and the baffle opening according to the corresponding relationship of the openings;

[0016] When the baffle opening is at the corresponding first extreme value when the actuator opening is at the initial value and when the actuator opening is adjusted to the extreme value, the baffle opening reaches the corresponding second extreme value at the same time, then it is determined that the opening adjustment accuracy test result of the static separator is normal.

[0017] Preferably, it further includes:

[0018] Grind the preset coal quality samples through the static separator, and record the pulverized coal economic fineness of each coal quality sample at different baffle openings to obtain the corresponding relationship between the baffle opening and the pulverized coal economic fineness of different coal quality samples.

[0019] Preferably, the calculation formula of the pulverized coal economic fineness is:

[0020] R 90 =0.5nV daf

[0021] In the formula, R 90 is the pulverized coal economic fineness, n is the pulverized coal uniformity index, and V daf is the dry ash-free basis volatile matter of the coal.

[0022] Meanwhile, a second aspect of the present application provides a regulating and controlling device for a static separator of a coal-fired power plant, including:

[0023] An opening initialization unit for initializing the opening parameter of the actuator in response to a static separator adjustment test instruction;

[0024] A cold-state debugging unit for adjusting the opening parameter of the actuator step by step through a preset opening adjustment logic, and recording the baffle opening corresponding to different actuator openings to obtain the corresponding relationship between the actuator opening and the baffle opening;

[0025] An opening adjustment accuracy determination unit for determining the opening adjustment accuracy test result of the static separator according to the corresponding relationship.

[0026] Preferably, it further includes:

[0027] A hot-state debugging unit for grinding a preset coal quality sample through a static separator and recording the pulverized coal economic fineness of each coal quality sample at different baffle openings to obtain the corresponding relationship between the baffle opening and the pulverized coal economic fineness of different coal quality samples.

[0028] The third aspect of this application provides a regulation and control terminal for a static separator in a coal-fired power plant, including: a memory and a processor;

[0029] The memory is used to store program code, and the program code is used to implement a regulation and control method for a static separator in a coal-fired power plant as provided in the first aspect of this application;

[0030] The processor is used to read and execute the program code.

[0031] The fourth aspect of this application provides a computer-readable storage medium, in which program code is stored, and the program code is used to be read and executed by a processor to implement a regulation and control method for a static separator in a coal-fired power plant as provided in the first aspect of this application.

[0032] From the above technical solutions, it can be seen that this application has the following advantages:

[0033] The technical solution provided by this application is aimed at the retrofitted static separator equipped with an electric actuator. First, according to the opening parameter range of the baffle and actuator of the static separator, the opening parameters of the actuator are initialized. Through the preset opening adjustment logic, the opening parameters of the actuator are adjusted in sequence, and the corresponding baffle openings for different actuator openings are recorded, so as to obtain the corresponding relationship between the actuator opening and the baffle opening, and based on this corresponding relationship, the control accuracy of the actuator is determined, which can improve the reliability of pulverized coal separation of the static separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic flowchart of an embodiment of a regulation and control method for a static separator in a coal-fired power plant provided by this application.

[0036] Figure 2 It is a schematic structural diagram of an embodiment of a regulation and control device for a static separator in a coal-fired power plant provided by this application.

[0037] Figure 3 The figure is a schematic structural diagram of an embodiment of a regulating and controlling terminal for a static separator in a coal-fired power plant provided by this application. Specific embodiments

[0038] The original design of the separator for the coal mill is a traditional centrifugal static separator. The separator has a cylindrical or conical outer shell, which is connected to the grinding area of the coal mill by a flange. Along the circumference of the upper part inside the separator, a plurality of deflecting baffles for adjusting the fineness of pulverized coal are evenly distributed. The angle of the baffles can be adjusted outside the shell, and the fineness of pulverized coal can be adjusted according to requirements. The gas-pulverized coal mixture flows through the baffles, changes the flow direction and generates rotation. The unqualified coarse powder with large fineness falls back into the coal pipe under the action of centrifugal force and gravity and enters the coal mill again for separation, sinks to the grinding area, and is reground. After being separated by the separator, the qualified pulverized coal is transported to the burner through the pulverized coal pipeline and blown into the furnace for combustion. The pulverized coal is separated by using a stationary baffle method, and the particle size can be adjusted by gravity, speed and the flow around in the tangential baffle area, that is, the fineness of pulverized coal is controlled by adjusting the opening of the static separator baffle. For HP medium-speed coal mills, by adjusting the baffle of the centrifugal separator, the fineness of the pulverized coal at the outlet can be adjusted within a large range, and basically can meet the requirements of other coal types except anthracite for the fineness of pulverized coal.

[0039] In the actual application process of the existing retrofitted static separator equipped with an electric actuator, there are large errors in the pulverized coal particles entering the furnace separated. After research, it is found that this phenomenon is caused by the mechanical deviation during the assembly of the actuator mechanism or after the separator has been running for a period of time, the connection mechanism between the actuator and the baffle is loose or worn, resulting in a decrease in control accuracy, which leads to the mismatch between the opening control parameter of the actuator and the actual opening of the baffle, and further leads to the large error between the size of the screened pulverized coal particles and the theoretical size.

[0040] In view of this, the embodiments of this application provide a regulating and controlling method, device, terminal and medium for a static separator in a coal-fired power plant, which are used to solve the technical problem of inaccurate pulverized coal separation existing in the existing static separator.

[0041] To make the invention purpose, features and advantages of this application more obvious and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the embodiments described below are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0042] First, a detailed description of an embodiment of a regulating and controlling method for a static separator in a coal-fired power plant provided by this application is as follows:

[0043] Please refer to Figure 1 , a method for regulating and controlling a static separator in a coal-fired power plant provided by an embodiment of the present application includes:

[0044] Step 101: In response to a static separator adjustment test instruction, initialize the opening parameter of the actuator;

[0045] Step 102: Adjust the opening parameter of the actuator in sequence through a preset opening adjustment logic, and record the baffle opening corresponding to different actuator openings to obtain the opening correspondence between the actuator opening and the baffle opening;

[0046] Step 103: Determine the opening adjustment accuracy test result of the static separator according to the opening correspondence.

[0047] It should be noted that when the system receives a static separator adjustment test instruction, it starts to trigger the verification of the actuator control accuracy of the static separator. First, initialize the opening parameter of the actuator.

[0048] More specifically, the initialization implementation method of the actuator opening parameter can be as follows: According to the opening parameter range of the actuator, initialize the opening parameter of the actuator with one of the extreme values of the opening parameter range. Among them, the opening parameter range of the actuator is generally [0%, 100%], 0% generally corresponds to the minimum baffle opening of the static separator, and 100% generally corresponds to the maximum baffle opening of the static separator. It can be understood that due to the originally configured matching relationship between the actuator opening and the baffle opening, when the actuator opening parameter is initialized, the baffle opening of the separator will also be initialized synchronously.

[0049] Then, after the actuator opening is initialized, based on the preset opening adjustment logic, adjust the opening parameter of the actuator in sequence, so that the baffle opening of the separator is adjusted synchronously, and at the same time record the baffle opening corresponding to different actuator openings to obtain the opening correspondence between the actuator opening and the baffle opening; for example, assume that the initial opening of the actuator is: 0%, and gradually adjust the opening parameter of the actuator until the opening parameter of the actuator reaches 100% according to the preset opening adjustment step. At the same time, during the process of adjusting the actuator opening parameter, record the baffle opening corresponding to different actuator openings, so as to obtain the opening correspondence between the actuator opening and the baffle opening. The opening adjustment logic provided in this embodiment can either be adjusted from 0% to 100% as described in the above example, or from 100% to 0%.

[0050] Then, according to the opening correspondence obtained above, determine the opening adjustment accuracy test result of the static separator.

[0051] Judge the synchronous state of the actuator opening and the baffle opening according to the above opening correspondence;

[0052] When the actuator opening is at the initial value, the baffle opening is at the corresponding first extreme value, and when the actuator opening is adjusted to the extreme value, the baffle opening simultaneously reaches the corresponding second extreme value, it is determined that the opening adjustment accuracy test result of the static separator is normal. For example, when the actuator opening is at the initial value of 0%, the baffle opening is synchronously at the minimum opening, and then when the actuator opening reaches 100%, the baffle opening also synchronously reaches the maximum opening, then it can be determined that the opening adjustment accuracy test result of this baffle is normal. If the baffle opening does not reach the corresponding maximum opening when the actuator opening reaches 100% or the baffle opening reaches the maximum opening too early, it can indicate that there is an abnormality in the opening adjustment accuracy of this baffle, and there may be abnormal conditions such as baffle jamming and excessive mechanical deviation during the installation of the actuator mechanism. In addition, in addition to the above preferred determination conditions, it is also possible to judge the smoothness of the change between the actuator opening and the baffle opening according to the opening correspondence relationship, and determine the opening adjustment accuracy of each baffle in the static separator.

[0053] Furthermore, the method provided in this embodiment further includes:

[0054] Step 104: Grind the preset coal quality samples through the static separator, and record the pulverized coal economic fineness at different baffle openings for each coal quality sample, so as to obtain the correspondence relationship between the baffle opening and the pulverized coal economic fineness of different coal quality samples.

[0055] More specifically, the calculation formula for the pulverized coal economic fineness is:

[0056] R 90 =0.5nV daf

[0057] In the formula, R 90 is the pulverized coal economic fineness, n is the pulverized coal uniformity index, and V daf is the dry ash-free basis volatile matter of the coal.

[0058] It should be noted that after completing the above cold-state opening adjustment accuracy debugging, a hot-state fineness baseline test can be further carried out to complete the opening - pulverized coal fineness curve of the actual coal-making separator, specifically as follows:

[0059] In this embodiment, A and C mills are used to perform fineness calibration tests with the preset coal quality. Taking two coal qualities of Indonesian coal and domestic coal as examples, while keeping the output of the coal mill basically unchanged under normal operating conditions, change the baffle opening of the coal mill separator. Select the baffle openings of the A mill separator to be 55%, 60% and 70% respectively, and select the baffle openings of the C mill separator to be 35%, 45% and 55% respectively. After adjustment, stabilize for 30 minutes, and the test personnel conduct pulverized coal sampling tests. The final test pulverized coal fineness range includes the theoretical economic pulverized coal fineness, and the separator opening - pulverized coal fineness R 90 curve is obtained.

[0060] The dry ash-free basis volatile matter of Indonesian coal ground by Mill C is 41.66%. Calculate the economic pulverized coal fineness R 90 = 23%. Under the test condition of the separator baffle opening of 35%, R 90 = 23.72%, meeting the requirement of the calculated economic pulverized coal fineness. It is recommended that when using this coal type or similar coal types in Mill C, the separator baffle opening be controlled at 35% which is more appropriate. If the moisture content of the Indonesian coal type being ground is too high and the drying capacity of the mill is insufficient, affecting the safe and stable operation of the mill, the separator baffle angle can be adjusted to 40%.

[0061] The dry ash-free basis volatile matter of domestic coal ground by Mill A is 26.41%. Calculate the economic pulverized coal fineness R 90 = 14.5%. Under the test condition of the separator baffle opening of 55%, R 90 = 9.4%, which is better than the calculated economic pulverized coal fineness. It is recommended that when using this coal type or similar coal types in Mill A, the separator baffle opening be controlled at 55% which is more appropriate. By pre-generating the opening curve adapted to different coal types, it is convenient to reduce the adjustment frequency and indirectly alleviate the mechanical wear problem according to the actual coal type and the corresponding opening curve during the actual application stage.

[0062] The above is the detailed description of an embodiment of a method for regulating and controlling a static separator in a coal-fired power plant provided by this application. The following is the detailed description of an embodiment of a device for regulating and controlling a static separator in a coal-fired power plant provided by this application.

[0063] Please refer to Figure 2 , an embodiment of this application provides a device for regulating and controlling a static separator in a coal-fired power plant, including:

[0064] An opening initialization unit 201, configured to initialize the opening parameter of the actuator in response to a static separator adjustment test instruction;

[0065] A cold-state debugging unit 202, configured to sequentially adjust the opening parameter of the actuator through a preset opening adjustment logic, and record the baffle opening corresponding to different actuator openings, so as to obtain the corresponding relationship between the actuator opening and the baffle opening;

[0066] An opening adjustment accuracy determination unit 203, configured to determine the opening adjustment accuracy test result of the static separator according to the corresponding relationship.

[0067] Further, it further includes:

[0068] A hot-state debugging unit 204, configured to grind the preset coal quality samples through the static separator, and record the pulverized coal economic fineness of each coal quality sample at different baffle openings, so as to obtain the corresponding relationship between the baffle opening and the pulverized coal economic fineness of different coal quality samples.

[0069] As Figure 3 shown, a regulation control terminal for a static separator in a coal-fired power plant provided by this application. The implementation manners of the terminal include, but are not limited to: personal computers, industrial computers, servers, and embedded intelligent devices. The main components of the terminal include: a memory 33 and a processor 31, and the memory 33 and the processor 31 can be connected through a communication bus 34;

[0070] The memory 33 is used to store program codes, and the program codes are used to implement a regulation control method for a static separator in a coal-fired power plant as provided in the above embodiment;

[0071] The processor 31 is used to read and execute the program codes.

[0072] A fourth aspect of this application provides a computer-readable storage medium. Program codes are stored in the computer-readable storage medium and are used to be read and executed by a processor to implement a regulation control method for a static separator in a coal-fired power plant as provided in the above embodiment.

[0073] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described terminal, device, and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0074] In several embodiments provided by this application, it should be understood that the disclosed terminal, device, and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection of the device or unit may be in an electrical, mechanical, or other form.

[0075] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of this application and the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here, for example, can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0076] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Here, A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one)" or a similar expression below refers to any combination of these items, including any combination of a single item (one) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0077] The unit described as a separate component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0078] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0079] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs, etc., which can store program codes.

[0080] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for regulating and controlling a static separator in a coal-fired power plant, characterized in that: include: In response to a static separator adjustment test instruction, initializing an actuator opening parameter; By means of a preset opening adjustment logic, the opening parameters of the actuator are adjusted in sequence, and the damper openings corresponding to different actuator openings are recorded to obtain the opening correspondence relationship between the actuator opening and the damper opening; According to the opening correspondence, the opening adjustment accuracy test result of the static separator is determined.

2. A method for regulating and controlling a static separator in a coal-fired power plant according to claim 1, characterized in that: Initializing the opening parameters of the actuator includes: According to the opening parameter range of the actuator, the opening parameter of the actuator is initialized with one of the maximum values ​​in the opening parameter range.

3. A method for regulating and controlling a static separator in a coal-fired power plant according to claim 2, characterized in that: By means of the preset opening adjustment logic, the opening parameters of the actuator are adjusted in sequence, and the damper openings corresponding to different actuator openings are recorded to obtain the corresponding relationship between the actuator opening and the damper opening, including: According to the preset opening adjustment step, the opening parameters of the actuator are adjusted in sequence, so that the initial value of the opening parameter of the actuator is gradually adjusted to another maximum value; The damper openings corresponding to different actuator openings are recorded to obtain the corresponding relationship between the actuator openings and the damper openings.

4. A method for regulating and controlling a static separator in a coal-fired power plant according to claim 3, characterized in that: According to the opening correspondence, determining the opening adjustment accuracy test result of the static separator includes: According to the opening correspondence, determining the synchronization state of the actuator opening and the damper opening; When the actuator opening is at the initial value, the baffle opening is at the corresponding first maximum value and when the actuator opening is adjusted to the maximum value, the baffle opening simultaneously reaches the corresponding second maximum value, then it is determined that the opening adjustment accuracy test result of the static separator is normal.

5. A method for regulating and controlling a static separator in a coal-fired power plant according to claim 1, characterized in that: Also includes: The preset coal samples are ground by a static separator, and the economic fineness of coal powder of each coal sample at different baffle openings is recorded to obtain the corresponding relationship between the baffle openings of different coal samples and the economic fineness of coal powder.

6. A method for regulating and controlling a static separator in a coal-fired power plant according to claim 5, characterized in that: The calculation formula of the economic fineness of the coal powder is: R 90 =0.5nV daf In the formula, R 90 is the economic fineness of coal powder, n is the uniformity index of coal powder, V daf It is the dry ash-free volatile matter of coal.

7. A static separator adjustment and control device for a coal-fired power plant, characterized in that: include: An opening initialization unit, used to initialize the opening parameters of the actuator in response to a static separator adjustment test instruction; A cold debugging unit, used to adjust the opening parameters of the actuator in sequence through a preset opening adjustment logic, and record the damper openings corresponding to different actuator openings to obtain a corresponding relationship between the actuator openings and the damper openings; The opening adjustment accuracy determination unit is used to determine the opening adjustment accuracy test result of the static separator according to the corresponding relationship.

8. A static separator regulating and controlling device for a coal-fired power plant according to claim 7, characterized in that: Also includes: The hot debugging unit is used to grind the preset coal quality samples through a static separator, and record the economic fineness of coal powder of each coal quality sample at different damper openings, so as to obtain the corresponding relationship between the damper openings of different coal quality samples and the economic fineness of coal powder.

9. A static separator adjustment and control terminal for a coal-fired power plant, characterized in that: include: Memory and processor; The memory is used to store program codes, and the program codes are used to implement a method for regulating and controlling a static separator of a coal-fired power plant according to any one of claims 1 to 6; The processor is used for reading and executing the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, and the program code is used to be read and executed by a processor to implement a method for regulating and controlling a static separator of a coal-fired power plant as described in any one of claims 1 to 6.

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