Control method of pulverizing system suitable for safe load reduction of unit under deep peak shaving

Abstract

The application provides a coal pulverizing system control method suitable for safe load reduction of a unit under deep peak regulation, and comprises the following steps: obtaining grid side dispatching information; when the grid side dispatching information is to stop the coal pulverizing system, setting the coal quantity of a coal feeder of the coal pulverizing system as a minimum value, closing an inlet door of the coal feeder, stopping the coal feeder, and closing an outlet door of the coal feeder; when the outlet door of the coal feeder is closed and a coal mill of the coal pulverizing system is running, lifting a grinding roller and enabling the coal mill to perform a blowing and cooling process; after the blowing and cooling process of the coal mill is completed, stopping the coal mill, lowering the grinding roller, closing a cold primary air regulating door of the coal mill, and closing a cold primary air shutdown door of the coal mill; after the cold primary air shutdown door of the coal mill is closed, closing a sealing air door of the coal mill and the coal feeder, closing the outlet door of the coal mill, and completing the stopping operation of the coal pulverizing system. The application reduces disturbance to a coordinated control system and realizes safe and efficient load reduction of a unit.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for generator sets, and in particular to a control method and device for a pulverizing system adapted to safe load reduction under deep peak shaving of generator sets. Background Technology

[0002] Traditional thermal power units typically operate within a peak load range of 50% to 100% Pe. However, with the rapid increase in demand for flexible operation of thermal power units in recent years, upgrades such as control optimization have largely achieved peak load operation within the 40% to 100% Pe load range. Under the trend of thermal power units transitioning to basic support and system regulation power sources, these units now face the challenge of further improving their flexible operation, peak load regulation, and frequency regulation capabilities. Deep peak load operation within the 20% to 40% Pe load range has become a key area for upgrading the flexible operation of thermal power units.

[0003] Under deep peak shaving conditions, the automatic control system of thermal power units faces unprecedented pressure. Under wider, faster, and lower load changes, the nonlinearity and time-varying nature of the regulated objects and systems become more pronounced. The impact of objective adverse factors such as coal quality changes and stratified blending is further amplified. The regulation margin of the thermal system and control equipment is further compressed and even approaches the control boundary. Existing technologies face many bottlenecks. Developing, researching, applying, improving, and maintaining optimized control technologies adapted to ultra-low load operation of units is one of the essential core tasks in the technological upgrading and transformation of thermal power plants. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the first objective of this application is to propose a control method for a pulverizing system that is adapted to safe load reduction under deep peak shaving of the unit. This method solves the problems of cumbersome operation, routine steps, and imprecise program settings when the existing unit automatically stops. It realizes the unit's need for rapid response to the load adjustment of the grid side, promotes the strategic goal of flexible peak shaving, and meets the requirements of an efficient and safe intelligent shutdown method for the pulverizing system.

[0006] The second objective of this application is to propose a control device for a pulverizing system that is adapted to safe load reduction under deep peak shaving of the unit.

[0007] The third objective of this application is to propose a computer device.

[0008] The fourth objective of this application is to provide a non-transitory computer-readable storage medium.

[0009] To achieve the above objectives, the first aspect of this application proposes a control method for a pulverizing system adapted to safe load reduction under deep peak shaving of power units, comprising: acquiring grid-side dispatch information; when the grid-side dispatch information indicates that the pulverizing system should be stopped, setting the coal feeder of the pulverizing system to the minimum value, closing the inlet gate of the coal feeder, stopping the coal feeder, and closing the outlet gate of the coal feeder; after the outlet gate of the coal feeder is closed and the pulverizer of the pulverizing system is running, raising the grinding rollers and purging and cooling the pulverizer; after the pulverizer has completed the purging and cooling process, stopping the pulverizer, lowering the grinding rollers, closing the cold primary air regulating valve of the pulverizer, and closing the cold primary air shut-off valve of the pulverizer; after the cold primary air shut-off valve of the pulverizer is closed, closing the sealing dampers of the pulverizer and the coal feeder, closing the outlet gate of the pulverizer, and completing the shutdown operation of the pulverizing system.

[0010] Optionally, in one embodiment of this application, setting the coal feeder of the pulverizing system to a minimum value, closing the inlet gate of the coal feeder, stopping the coal feeder, and closing the outlet gate of the coal feeder includes:

[0011] The coal feeder is set to decrease at a first preset rate until the coal feeder reaches its minimum value, and the cold primary air regulating valve of the coal mill is switched to automatic mode.

[0012] When the coal feeder's coal quantity drops to the minimum and the cold primary air regulating valve of the coal mill is in automatic mode, close the coal feeder's inlet door;

[0013] After completing the operation of closing the inlet gate of the coal feeder, stop the coal feeder and close the outlet gate of the coal feeder.

[0014] Optionally, in one embodiment of this application, when the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, the grinding rollers are raised and the coal mill is purged and cooled, including:

[0015] When the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, raise the grinding rollers;

[0016] After the grinding rollers are raised to their positions, switch the hot primary air regulating valve of the coal mill to manual mode and close the hot primary air regulating valve of the coal mill at the second preset rate. After the hot primary air regulating valve of the coal mill is closed, close the hot primary air shut-off valve of the coal mill and set the temperature of the cold primary air regulating valve of the coal mill to the first preset value.

[0017] Optionally, in one embodiment of this application, after the coal mill completes the purging and cooling process, the hot primary air regulating valve of the coal mill is in manual mode, the hot primary air regulating valve of the coal mill is fully closed, the hot primary air shut-off valve of the coal mill is fully closed, the purging time is delayed, and the outlet temperature of the coal mill is less than the second preset value.

[0018] Optionally, in one embodiment of this application, after the coal mill completes the purging and cooling process, the coal mill is stopped, the grinding rollers are lowered, the primary air regulating damper of the coal mill is closed, and the primary air shut-off damper of the coal mill is closed, including:

[0019] After the coal mill completes the purging and cooling process, stop the coal mill.

[0020] After the coal mill stops, lower the grinding rollers;

[0021] After the grinding rollers are lowered into position, the cold primary air regulating valve of the coal mill is closed at the third preset rate;

[0022] After the primary air regulating valve is closed, the primary air shut-off valve of the coal mill is closed at the fourth preset rate.

[0023] Optionally, in one embodiment of this application, after the cold primary air shut-off door of the coal mill is closed, the sealing dampers of the coal mill and the coal feeder are closed, and the outlet door of the coal mill is closed to complete the shutdown operation of the pulverizing system, including:

[0024] After the cold primary air shut-off valve of the coal mill is closed, close the sealing damper of the coal mill and the sealing damper of the coal feeder.

[0025] After the sealing dampers of the coal mill and the coal feeder are closed, close the outlet gate of the coal mill.

[0026] After the outlet gate of the coal mill is closed, the pulverizing system is shut down.

[0027] To achieve the above objectives, a second aspect of this application provides a pulverizing system control device adapted to safe load reduction under deep peak shaving of the unit, comprising:

[0028] The acquisition module is used to acquire grid-side dispatch information;

[0029] The first stop module is used to set the coal feeder of the pulverizing system to the minimum value, close the inlet gate of the coal feeder, stop the coal feeder, and close the outlet gate of the coal feeder when the grid-side dispatch information indicates that the pulverizing system should be stopped.

[0030] The second stop module is used to raise the grinding rollers and purge and cool the coal mill when the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running.

[0031] The third stop module is used to stop the coal mill, lower the grinding rollers, close the cold primary air regulating valve of the coal mill, and close the cold primary air shut-off valve of the coal mill after the coal mill has completed the purging and cooling process.

[0032] The fourth stop module is used to close the sealing dampers of the coal mill and the coal feeder, and close the outlet door of the coal mill after the cold primary air shut-off door of the coal mill is closed, thus completing the shutdown operation of the pulverizing system.

[0033] Optionally, in one embodiment of this application, the first stop module is specifically used for:

[0034] The coal feeder is set to decrease at a first preset rate until the coal feeder reaches its minimum value, and the cold primary air regulating valve of the coal mill is switched to automatic mode.

[0035] When the coal feeder's coal quantity drops to the minimum and the cold primary air regulating valve of the coal mill is in automatic mode, close the coal feeder's inlet door;

[0036] After completing the operation of closing the inlet gate of the coal feeder, stop the coal feeder and close the outlet gate of the coal feeder.

[0037] To achieve the above objectives, a third aspect of this application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the pulverizing system control method described in the above embodiment, which is adapted to safe load reduction under deep peak shaving of the unit.

[0038] To achieve the above objectives, a fourth aspect of this application provides a non-transitory computer-readable storage medium that, when the instructions in the storage medium are executed by a processor, can perform a pulverizing system control method adapted to safe load reduction under deep peak shaving of the unit.

[0039] The embodiments of this application provide a control method, apparatus, computer equipment, and non-temporary computer-readable storage medium for a pulverizing system that is adapted to safe load reduction under deep peak shaving of generating units. It solves the problems of cumbersome operation, routine steps, and imprecise program settings when the existing unit program automatically stops. It realizes the unit's need for rapid response to grid-side load shaving, promotes the strategic goal of flexible peak shaving, and meets the requirements of an efficient and safe intelligent shutdown method for the pulverizing system.

[0040] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0041] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0042] Figure 1 A flowchart of a pulverizing system control method adapted to safe load reduction under deep peak shaving of the unit, provided in Embodiment 1 of this application;

[0043] Figure 2 This is another flowchart of a pulverizing system control method adapted to safe load reduction under deep peak shaving of the unit, according to an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a pulverizing system control device adapted to safe load reduction under deep peak shaving of the unit, as provided in Embodiment 2 of this application. Detailed Implementation

[0045] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0046] The following description, with reference to the accompanying drawings, describes a pulverizing system control method and apparatus adapted to safe load reduction under deep peak shaving of the unit, according to embodiments of this application.

[0047] Figure 1 This is a flowchart of a pulverizing system control method adapted to safe load reduction under deep peak shaving of the unit, provided in Embodiment 1 of this application.

[0048] like Figure 1 As shown, the control method for a pulverizing system adapted to safe load reduction under deep peak shaving of the unit includes the following steps:

[0049] Step 101: Obtain grid-side dispatch information;

[0050] Step 102: When the grid-side dispatch information indicates that the pulverizing system should be stopped, set the coal feeder of the pulverizing system to the minimum value, close the inlet gate of the coal feeder, stop the coal feeder, and close the outlet gate of the coal feeder.

[0051] Step 103: After the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, raise the grinding rollers and allow the coal mill to be purged and cooled.

[0052] Step 104: After the coal mill completes the purging and cooling process, stop the coal mill, lower the grinding rollers, close the primary air regulating valve of the coal mill, and close the primary air shut-off valve of the coal mill.

[0053] Step 105: After the cold primary air shut-off door of the coal mill is closed, close the sealing dampers of the coal mill and the coal feeder, and close the outlet door of the coal mill to complete the shutdown operation of the pulverizing system.

[0054] This application's embodiment of the control method for a pulverizing system adapted to safe load reduction under deep peak shaving of power units involves: acquiring grid-side dispatch information; when the grid-side dispatch information indicates a shutdown of the pulverizing system, setting the coal feeder of the pulverizing system to the minimum value, closing the feeder's inlet gate, stopping the feeder, and closing the feeder's outlet gate; after the feeder's outlet gate is closed and the pulverizer of the pulverizing system is running, raising the grinding rollers and purging and cooling the pulverizer; after the pulverizer completes the purging and cooling process, stopping the pulverizer, lowering the grinding rollers, closing the pulverizer's primary air regulating valve, and closing the pulverizer's primary air shut-off valve; after the pulverizer's primary air shut-off valve is closed, closing the sealing dampers of the pulverizer and feeder, and closing the pulverizer's outlet gate, thus completing the shutdown operation of the pulverizing system. This solves the problems of cumbersome operation, routine steps, and imprecise program settings when the existing unit automatically stops, realizes the unit's need for rapid response to grid-side load adjustment, promotes the strategic goal of flexible peak shaving, and meets the requirements of an efficient and safe intelligent shutdown method for pulverizing systems.

[0055] Furthermore, in this embodiment of the application, setting the coal feeder of the pulverizing system to the minimum value, closing the inlet gate of the coal feeder, stopping the coal feeder, and closing the outlet gate of the coal feeder includes:

[0056] The coal feeder is set to decrease at a first preset rate until the coal feeder reaches its minimum value, and the cold primary air regulating valve of the coal mill is switched to automatic mode.

[0057] When the coal feeder's coal quantity drops to the minimum and the cold primary air regulating valve of the coal mill is in automatic mode, close the coal feeder's inlet door;

[0058] After completing the operation of closing the inlet gate of the coal feeder, stop the coal feeder and close the outlet gate of the coal feeder.

[0059] Furthermore, in this embodiment of the application, when the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, raising the grinding rollers and purging and cooling the coal mill includes:

[0060] When the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, raise the grinding rollers;

[0061] After the grinding rollers are raised to their positions, switch the hot primary air regulating valve of the coal mill to manual mode and close the hot primary air regulating valve of the coal mill at the second preset rate. After the hot primary air regulating valve of the coal mill is closed, close the hot primary air shut-off valve of the coal mill and set the temperature of the cold primary air regulating valve of the coal mill to the first preset value.

[0062] Furthermore, in this embodiment of the application, after the coal mill completes the purging and cooling process, the primary air regulating valve of the coal mill is in manual mode, the primary air regulating valve of the coal mill is fully closed, the primary air shut-off valve of the coal mill is fully closed, the purging time is delayed, and the outlet temperature of the coal mill is less than the second preset value.

[0063] Further, in this embodiment of the application, after the coal mill completes the purging and cooling process, stopping the coal mill, lowering the grinding rollers, closing the primary air regulating valve of the coal mill, and closing the primary air shut-off valve of the coal mill include:

[0064] After the coal mill completes the purging and cooling process, stop the coal mill.

[0065] After the coal mill stops, lower the grinding rollers;

[0066] After the grinding rollers are lowered into position, the cold primary air regulating valve of the coal mill is closed at the third preset rate;

[0067] After the primary air regulating valve is closed, the primary air shut-off valve of the coal mill is closed at the fourth preset rate.

[0068] Furthermore, in this embodiment, after the cold primary air shut-off door of the coal mill is closed, the sealing dampers of the coal mill and the coal feeder are closed, and the outlet door of the coal mill is closed to complete the shutdown operation of the pulverizing system, including:

[0069] After the cold primary air shut-off valve of the coal mill is closed, close the sealing damper of the coal mill and the sealing damper of the coal feeder.

[0070] After the sealing dampers of the coal mill and the coal feeder are closed, close the outlet gate of the coal mill.

[0071] After the outlet gate of the coal mill is closed, the pulverizing system is shut down.

[0072] The purpose of this application is to design a control method for a pulverizing system that is adapted to safe load reduction under deep peak shaving of the unit. This method can smoothly complete the purging and cooling work when the coal mill is stopped, reasonably arrange the operation of the grinding rollers, and minimize the disturbance to the coordination control system when the pulverizing system is stopped, so as to achieve safe and efficient load reduction of the unit. At the same time, it can meet the load demand of the grid side under the current deep peak shaving background, so that the generator unit can appropriately and safely reduce the unit load under the environment of new energy generator units during the day.

[0073] The coal mills covered by this application are: roller mills with lubrication stations and hydraulic stations, and with rotary separators.

[0074] The coal feeder covered by this application is a weighing coal feeder with automatic coal quantity adjustment function.

[0075] This application optimizes the protections for coal mill flame protection, low coal mill inlet air volume, and low coal mill sealing air differential pressure; optimizes the logic for coal mill cold and hot primary air regulating valve settings, offset zeroing, and pre-opening valve commands; and optimizes the standby activation conditions between interconnected devices, such as the standby between oil pumps.

[0076] like Figure 2 As shown, when the operator selects to activate the safe load reduction control system (001), it indicates that the control system is ready for operation. The specific steps of this application include:

[0077] When receiving grid-side dispatch information requiring load reduction and shutdown of the pulverizing system

[0078] 1) Step 1: Reduce coal consumption (002);

[0079] Step 1 instructions: Set the minimum coal feeder command (to decrease coal at the set rate); put the pulverizer cold primary air regulating valve into automatic mode;

[0080] First step feedback: The coal feeder is at its minimum coal quantity; the primary air regulating valve of the coal mill is in automatic mode.

[0081] Points to note and techniques: The coal feeder command should be reduced to the minimum at a certain set rate, and the coal supply of the other operating coal feeders should be increased through the fuel main control to keep the total coal supply constant.

[0082] 2) Step Two: Close the coal feeder inlet door (003);

[0083] Second instruction: Close the coal feeder inlet gate;

[0084] Second step feedback: If the coal feeder's coal feed rate is less than 2t / h, delay for 10s;

[0085] Points to note and techniques: This uses a coal quantity feedback signal. Only when the actual coal quantity becomes 0 can it be said that there is no coal on the coal feeder belt. It is important to note the flame protection system of the coal mill. Therefore, it is necessary to optimize the flame protection of the coal mill and add a control strategy for judging the coal quantity.

[0086] 3) Step 3: Stop the coal feeder (004);

[0087] Third instruction: Stop the coal feeder and close the coal feeder outlet gate;

[0088] Third step feedback: The coal feeder has stopped and the coal feeder outlet gate has been closed.

[0089] 4) Step Four: Raise the grinding roller (005);

[0090] Fourth step instruction: Raise the grinding roller (an automatic grinding roller raising control strategy can also be adopted when the coal feeder stops and the coal mill is running).

[0091] Fourth step feedback: The grinding roller has been raised to the correct position.

[0092] Points to note and tips: Regarding the raising of the grinding roller, an automatic raising control strategy can also be adopted when the coal feeder stops and the coal mill is running. This prevents the coal feeder outlet gate from not closing properly in the third step of the sequential stop, thus preventing the execution of the fourth step of the sequential stop, which is to raise the grinding roller.

[0093] 5) Step five: The coal mill begins purging and cooling (006);

[0094] Step 5: Switch the hot primary air regulating valve of the coal mill to manual mode; close the hot primary air regulating valve of the coal mill at a certain set rate; after the hot primary air regulating valve of the coal mill is closed, close the hot primary air shut-off valve of the coal mill; set the temperature setting of the cold primary air regulating valve of the coal mill to 40℃ (or lower).

[0095] Fifth step feedback: The coal mill hot primary air regulating valve is in manual mode; the coal mill hot primary air regulating valve is fully closed; the coal mill hot primary air shut-off valve is fully closed, with a delay in purging time; the coal mill outlet temperature is <60℃.

[0096] Important notes and tips: Pay attention to the low primary air volume protection at the coal mill inlet. Do not allow the low primary air volume protection at the coal mill inlet to be triggered. The coal mill purging and cooling process must be completed.

[0097] 6) Step Six: Stop the coal mill (007);

[0098] Sixth instruction: Stop the coal mill;

[0099] Step 6 Feedback: The coal mill has stopped, delayed for 15 seconds.

[0100] 7) Step Seven: Stop the grinding roller (008);

[0101] Seventh instruction: Lower the grinding roller;

[0102] Step 7 Feedback: The grinding roller has been lowered into position.

[0103] 8) Step 8: Close the cold air regulating damper of the coal mill (009);

[0104] Step 8: Close the primary air regulating valve of the coal mill (close at the set rate);

[0105] Step 8 Feedback: The cold primary air regulating door of the coal mill has been closed.

[0106] 9) Step Nine: Close the coal mill cold air shut-off door (010);

[0107] Step 9: Close the primary air shut-off valve of the coal mill (close at the set rate);

[0108] Step 9 Feedback: The primary air shut-off door of the coal mill has been closed.

[0109] 10) Step 10: Close the sealing dampers of the coal mill and coal feeder (011);

[0110] Step 10: Close the coal mill sealing damper and the coal feeder sealing damper;

[0111] Step 10 Feedback: The coal mill sealing damper is closed, and the coal feeder sealing damper is closed.

[0112] 11) Step Eleven: Close the coal mill outlet gate (012);

[0113] Step 11 Instruction: Close the coal mill outlet gate;

[0114] Step 11 Feedback: The coal mill outlet door has been closed.

[0115] This application discloses a control method for a pulverizing system adapted to safe load reduction under deep peak shaving of generating units. This method achieves intelligent shutdown of the pulverizing system during the process of adjusting the operating load of the generating unit. Under the current deep peak shaving conditions, operators can flexibly shut down the system based on the current unit status, grid-side dispatch information, daily power generation, daily fuel consumption, and the start / stop status of each coal mill. This solves the problems of cumbersome operation, routine procedures, and imprecise program settings in previous automatic unit shutdown procedures. It enables the unit to quickly respond to the needs of grid-side load adjustments, promotes the strategic goal of flexible peak shaving, and meets the requirements of an efficient and safe intelligent shutdown method for the pulverizing system.

[0116] Figure 3 This is a schematic diagram of the structure of a pulverizing system control device adapted to safe load reduction under deep peak shaving of the unit, as provided in Embodiment 2 of this application.

[0117] like Figure 3 As shown, the pulverizing system control device adapted for safe load reduction under deep peak shaving of the unit includes:

[0118] Module 10 is used to acquire grid-side dispatch information;

[0119] The first stop module 20 is used to set the coal feeder of the pulverizing system to the minimum value, close the inlet gate of the coal feeder, stop the coal feeder, and close the outlet gate of the coal feeder when the grid-side dispatch information is to stop the pulverizing system.

[0120] The second stop module 30 is used to raise the grinding rollers and purge and cool the coal mill when the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running.

[0121] The third stop module 40 is used to stop the coal mill, lower the grinding rollers, close the cold primary air regulating valve of the coal mill, and close the cold primary air shut-off valve of the coal mill after the coal mill has completed the purging and cooling process.

[0122] The fourth stop module 50 is used to close the sealing dampers of the coal mill and the coal feeder, and close the outlet door of the coal mill after the cold primary air shut-off door of the coal mill is closed, thus completing the stop operation of the pulverizing system.

[0123] This application embodiment of the control device for a pulverizing system adapted to safe load reduction under deep peak shaving of power units includes an acquisition module for acquiring grid-side dispatch information; a first stop module for setting the coal feeder of the pulverizing system to the minimum value, closing the inlet gate of the coal feeder, stopping the coal feeder, and closing the outlet gate of the coal feeder when the grid-side dispatch information indicates that the pulverizing system should be stopped; a second stop module for raising the grinding rollers and purging and cooling the coal mill when the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running; a third stop module for stopping the coal mill, lowering the grinding rollers, closing the cold primary air regulating valve of the coal mill, and closing the cold primary air shut-off valve of the coal mill after the purging and cooling process of the coal mill is completed; and a fourth stop module for closing the sealing dampers of the coal mill and the coal feeder, closing the outlet gate of the coal mill, and completing the shutdown operation of the pulverizing system after the cold primary air shut-off valve of the coal mill is closed. This solves the problems of cumbersome operation, routine steps, and imprecise program settings when the existing unit automatically stops, realizes the unit's need for rapid response to grid-side load adjustment, promotes the strategic goal of flexible peak shaving, and meets the requirements of an efficient and safe intelligent shutdown method for pulverizing systems.

[0124] Furthermore, in this embodiment of the application, the first stop module is specifically used for:

[0125] The coal feeder is set to decrease at a first preset rate until the coal feeder reaches its minimum value, and the cold primary air regulating valve of the coal mill is switched to automatic mode.

[0126] When the coal feeder's coal quantity drops to the minimum and the cold primary air regulating valve of the coal mill is in automatic mode, close the coal feeder's inlet door;

[0127] After completing the operation of closing the inlet gate of the coal feeder, stop the coal feeder and close the outlet gate of the coal feeder.

[0128] To implement the above embodiments, this application also proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the pulverizing system control method described in the above embodiments that is adapted to safe load reduction under deep peak shaving of the unit.

[0129] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the pulverizing system control method adapted to safe load reduction under deep peak shaving of the unit as described in the above embodiments.

[0130] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0131] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0132] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0133] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0134] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0135] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0136] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0137] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A control method for a pulverizing system adapted to safe load reduction under deep peak shaving of the unit, characterized in that, Obtain grid-side dispatch information; When the grid-side dispatch information indicates that the pulverizing system should be stopped, the coal feeder of the pulverizing system should be set to the minimum value, the inlet gate of the coal feeder should be closed, the coal feeder should be stopped, and the outlet gate of the coal feeder should be closed. When the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, the grinding rollers are raised and the coal mill is purged and cooled. After the coal mill completes the purging and cooling process, the coal mill is stopped, the grinding rollers are lowered, the primary air regulating valve of the coal mill is closed, and the primary air shut-off valve of the coal mill is closed. After the cold primary air shut-off door of the coal mill is closed, the sealing dampers of the coal mill and the coal feeder are closed, and the outlet door of the coal mill is closed to complete the shutdown operation of the pulverizing system. After the coal mill completes the purging and cooling process, the process of stopping the coal mill, lowering the grinding rollers, closing the primary air regulating valve of the coal mill, and closing the primary air shut-off valve of the coal mill includes: After the coal mill completes the purging and cooling process, the coal mill is stopped. After the coal mill stops, the grinding rollers are lowered; After the grinding rollers are lowered into position, the cold primary air regulating valve of the coal mill is closed at the third preset rate. After the cold primary air regulating valve is closed, the cold primary air shut-off valve of the coal mill is closed at the fourth preset rate. The step of closing the sealing dampers of the coal mill and the coal feeder after the cold primary air shut-off door of the coal mill is closed, and closing the outlet door of the coal mill, to complete the shutdown operation of the pulverizing system, includes: After the cold primary air shut-off valve of the coal mill is closed, the sealing damper of the coal mill and the sealing damper of the coal feeder are closed. After the sealing damper of the coal mill and the sealing damper of the coal feeder are closed, the outlet door of the coal mill is closed. After the outlet gate of the coal mill is closed, the pulverizing system is shut down.

2. The method as described in claim 1, characterized in that, Setting the coal feeder of the pulverizing system to the minimum value, closing the inlet gate of the coal feeder, stopping the coal feeder, and closing the outlet gate of the coal feeder include: The coal feeder is set to decrease at a first preset rate until the coal feeder reaches its minimum value, and the cold primary air regulating valve of the coal mill is switched to automatic mode. When the coal feeder's coal quantity drops to its minimum and the cold primary air regulating valve of the coal mill is in automatic mode, the inlet door of the coal feeder is closed. After completing the operation of closing the inlet gate of the coal feeder, stop the coal feeder and close the outlet gate of the coal feeder.

3. The method as described in claim 1, characterized in that, When the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, raising the grinding rollers and purging and cooling the coal mill includes: When the outlet gate of the coal feeder is closed and the coal mill of the pulverizing system is running, the grinding rollers are raised. After the grinding rollers are raised to their positions, the hot primary air regulating valve of the coal mill is switched to manual mode and closed at a second preset rate. After the hot primary air regulating valve of the coal mill is closed, the hot primary air shut-off valve of the coal mill is closed, and the temperature of the cold primary air regulating valve of the coal mill is set to a first preset value.

4. The method as described in claim 3, characterized in that, After the coal mill completes the purging and cooling process, the primary air regulating valve of the coal mill is in manual mode, the primary air regulating valve of the coal mill is fully closed, the primary air shut-off valve of the coal mill is fully closed, the purging time is delayed, and the outlet temperature of the coal mill is less than the second preset value.

5. A computer device, characterized in that, It includes 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, it implements the method as described in any one of claims 1-4.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-4.

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