System, method, apparatus and medium for improving safety of boiler heating surface

Abstract

The application provides a kind of to improve boiler heating surface security system, method, equipment and medium, belong to boiler safety technical field.The system includes: coal-fired unit is used to send current operating load to load control system;Load control system is used to obtain preset operating load and load adjustment time according to the dispatching instruction issued by power grid system, and according to preset boiler load adjustment rate, current operating load, preset operating load and load adjustment time, determine adjustment load;Load control system is also used to generate first adjustment instruction or second adjustment instruction according to the size relationship before current operating load and preset operating load;Energy storage system is used to store or transport adjustment load when receiving first adjustment instruction or second adjustment instruction.The application adjusts the load stored or transported by energy storage system through load control system, to improve the load raising and lowering rate of boiler, so as to ensure the safety of boiler heating surface under deep peak shaving.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler safety, and in particular to a system for improving the safety of a boiler heating surface, a control method for improving the safety of a boiler heating surface, an electronic device, and a computer-readable storage medium. Background Art

[0002] At present, when coal-fired units participate in deep peak regulation, the unit load change rate is required to be relatively fast, which will inevitably cause large changes in the temperature of the heating surface wall of the unit boiler, and will lead to aggravated uneven stress distribution on the boiler heating surface and the manifold. If operated under such conditions for a long time, fatigue damage of the heating surface material will be aggravated, the risk of boiler tube burst will increase, and cracks or leakage will appear on the heating surface of the boiler of a large number of units participating in deep peak regulation, resulting in unplanned shutdown of the unit and a significant reduction in the unit's operating reliability.

[0003] In summary, the safety of the heating surface of the boiler of a coal-fired unit is poor under deep peak regulation. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a system, method, device and medium for improving the safety of boiler heating surfaces, so as to solve the problem of poor safety of the heating surfaces of coal-fired unit boilers under deep peak regulation.

[0005] To achieve the above objectives, in a first aspect of an embodiment of the present invention, a system for improving the safety of boiler heating surfaces is provided, comprising: a coal-fired unit, an energy storage system, a power grid system, and a load control system, wherein the load control system is coupled to the coal-fired unit, the energy storage system, and the power grid system, respectively; the coal-fired unit is coupled to the power grid system and the energy storage system, respectively; and the energy storage system is coupled to the power grid system;

[0006] The coal-fired unit is used to send the current operating load of the coal-fired unit to the load control system;

[0007] The load control system is used to obtain the preset operating load and load adjustment time of the coal-fired unit according to the dispatching instruction issued by the power grid system, and determine the adjustment load according to the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load adjustment time;

[0008] The load control system is further configured to generate a first adjustment instruction when the current operating load of the coal-fired unit exceeds the preset operating load; and generate a second adjustment instruction when the current operating load of the coal-fired unit does not reach the preset operating load;

[0009] The energy storage system is configured to store the regulated load provided by the coal-fired unit upon receiving the first regulation instruction;

[0010] The energy storage system is further configured to transmit the stored regulated load to the power grid system upon receiving the second regulation instruction.

[0011] Optionally, the load control system includes: a first load calculation module, a second load calculation module and a third load calculation module; the load adjustment time includes: a first load adjustment time and a second load adjustment time;

[0012] The first load calculation module is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the first load adjustment time using formula (1) to obtain the first adjustment load;

[0013] (1);

[0014] in, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time;

[0015] The second load calculation module is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time using formula (2) to obtain the second adjustment load;

[0016] (2);

[0017] in, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time;

[0018] The third load calculation module is used to calculate the first regulating load and the second regulating load using formula (3) to obtain the regulating load;

[0019] (3);

[0020] in, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

[0021] Optionally, the energy storage system further comprises: a first on-switch and a second on-switch;

[0022] The first on-off switch is used to control the on-off between the coal-fired unit and the energy storage system;

[0023] The second on-switch is used to control the on-off between the power grid system and the energy storage system;

[0024] When the energy storage system receives the first adjustment instruction, the energy storage system turns on the first switch, so that the energy storage system stores the adjustment load provided by the coal-fired unit;

[0025] When the energy storage system receives the second adjustment instruction, the energy storage system turns on the second switch, so that the energy storage system transmits the stored adjustment load to the power grid system;

[0026] When the operating load of the coal-fired unit reaches the preset operating load, the energy storage system turns off the first on-switch and the second on-switch, so that the coal-fired unit and the power grid system operate normally.

[0027] In a second aspect of an embodiment of the present invention, a control method for a system for improving the safety of a heating surface of a coal-fired unit boiler is provided. The method is based on the above-mentioned system for improving the safety of a heating surface of a coal-fired unit boiler and includes:

[0028] Obtaining the current operating load, preset operating load, and load adjustment time of the coal-fired unit; wherein the preset operating load and load adjustment time of the coal-fired unit are obtained according to the dispatching instruction issued by the power grid system;

[0029] Obtaining a regulated load based on a preset boiler load regulation rate, a current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, and a load regulation time;

[0030] When the current operating load of the coal-fired unit exceeds the preset operating load, generating a first adjustment instruction so that the energy storage system stores the adjustment load provided by the coal-fired unit upon receiving the first adjustment instruction;

[0031] When the current operating load of the coal-fired unit does not reach the preset operating load, a second adjustment instruction is generated, so that the energy storage system transmits the stored adjustment load to the power grid system when receiving the second adjustment instruction.

[0032] Optionally, the load adjustment time includes: a first load adjustment time and a second load adjustment time;

[0033] The regulated load is obtained based on the preset boiler load regulation rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load regulation time, including:

[0034] Obtaining a first regulated load based on the current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, a first load regulation time, and a preset boiler load regulation rate;

[0035] Obtaining a second adjustment load based on the current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, a second load adjustment time, and a preset boiler load adjustment rate;

[0036] The adjustment load is obtained based on the first adjustment load and the second adjustment load.

[0037] Optionally, obtaining the first regulated load based on the current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, a first load regulation time, and a preset boiler load regulation rate includes:

[0038] Using formula (1), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the first load adjustment time are calculated to obtain the first adjustment load;

[0039] (1);

[0040] in, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time.

[0041] Optionally, obtaining the second regulated load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the second load regulation time, and the preset boiler load regulation rate includes:

[0042] Using formula (2), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time are calculated to obtain the second adjustment load;

[0043] (2);

[0044] in, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time.

[0045] Optionally, obtaining the regulated load based on the first regulated load and the second regulated load includes:

[0046] Using formula (3), the first regulating load and the second regulating load are calculated to obtain the regulating load;

[0047] (3);

[0048] in, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

[0049] In a third aspect of the embodiment of the present invention, an electronic device is provided, comprising: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the control method for improving the safety system of the heating surface of the coal-fired unit boiler is executed.

[0050] In a fourth aspect of the embodiment of the present invention, a computer-readable storage medium is provided, which stores computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned control method for improving the safety system of the heating surface of the coal-fired unit boiler.

[0051] In an embodiment of the present invention, a system for improving the safety of boiler heating surfaces is provided, comprising: a coal-fired unit, an energy storage system, a power grid system, and a load control system; the coal-fired unit is used to send the current operating load to the load control system; the load control system is used to obtain a preset operating load and load adjustment time according to the dispatch instruction issued by the power grid system, and determine the adjustment load according to the preset boiler load adjustment rate, the current operating load, the preset operating load, and the load adjustment time; the load control system is also used to generate a first adjustment instruction or a second adjustment instruction according to the size relationship between the current operating load and the preset operating load; the energy storage system is used to store or transmit the adjustment load when receiving the first adjustment instruction or the second adjustment instruction. The present invention adjusts the storage or transmission load of the energy storage system through the load control system, thereby improving the load increase and decrease rate of the boiler, thereby ensuring the safety of the boiler heating surface under deep peak regulation.

[0052] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0053] The accompanying drawings are included to provide a further understanding of embodiments of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain embodiments of the application, but are not intended to limit the present application in any manner. In the drawings:

[0054] Figure 1 is a structural schematic diagram of a system for improving safety of a heating surface of a boiler provided by an embodiment of the present application;

[0055] Figure 2 is a flow schematic diagram of a control method of a system for improving safety of a heating surface of a boiler provided by an embodiment of the present application. DETAILED DESCRIPTION

[0056] The specific embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are merely intended to explain and illustrate the present application, and are not intended to limit the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for describing specific embodiments of the application only and is not intended to be limiting of the application.

[0058] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0059] Before introducing the present application, first, the operation process and principle are explained and described:

[0060] First step: the unit ignition start preparation work is ready, the unit has the start and the boiler ignition condition;

[0061] Second step: start the primary air fan, the air supply fan and the induced draft fan, start the coal mill (A mill) with the plasma system, and at the same time, the plasma arc ignites the pulverized coal. At the same time, apply to the grid dispatching control center for normal grid connection of the unit;

[0062] Third step: the unit load is increased to the load P MW required by the grid (i.e. the current operating load of the coal-fired unit), and remains unchanged for stable operation;

[0063] Fourth step: when the unit is normally operated, the energy storage system is disconnected from the power plant grid line, at this time, the energy storage system does not participate in the operation of the boiler-turbine power generation system;

[0064] Fifth step: the grid dispatching control center (i.e. the grid system) issues a unit participation peak shaving instruction to the unit, and the unit load needs to be adjusted to Q MW (i.e. the preset operating load) within t minutes, that is, the load adjustment rate is at least MW / minute;

[0065] Sixth step: the load adjustment rate is not less than MW / minute, which is very large for the boiler, while the normal boiler specification requires that the load adjustment rate is not greater than a MW / minute (i.e. the preset boiler load adjustment rate), and the load adjustment rate MW / minute is greater than a MW / minute, the heating surface wall temperature changes rapidly, the stress distribution of the heating surface and header is aggravated, and the impact on the service life of the heating surface is large;

[0066] Seventh step: at this time, the energy storage system is started to realize the coupled operation of the energy storage system and the coal-fired unit, and part of the power output by the coal-fired unit is stored in the energy storage system;

[0067] Eighth step: in order to ensure the safety of the boiler heating surface, the coal feed rate, air supply rate and water feed rate of the boiler are controlled to make the boiler load adjustment rate a MW / minute,

[0068] Ninth step: the grid dispatching control center (i.e. the grid system) requires that the load adjustment rate of the coal-fired unit is MW / minute, while the boiler load adjustment rate is a MW / minute, so the difference between the two needs to be stored or discharged by the energy storage system, that is, the energy storage system will maintain a corresponding storage / discharge rate as time changes, and the storage / discharge rate is different at different times, and the energy storage system storage / discharge rate is , n is the minute number. After calculation, after the first minute, the coal-fired unit supplies power to the grid system with a load of MW, the boiler load is adjusted to MW, and the energy storage system stores / discharges MW; after the second minute, the coal-fired unit supplies power to the grid system with a load of MW, the boiler load is adjusted to MW, and the energy storage system stores / discharges MW. Similarly, after t minutes, the coal-fired unit supplies power to the grid system with a load of Q MW, the boiler load is adjusted to MW, and the energy storage system stores / discharges MW. The above stage is the first stage of load adjustment.

[0069] After t minutes, the coal-fired unit supplies power to the grid system with a load of Q MW, and the actual load of the boiler is MW, which is still greater than the Q MW required by the power grid, and the power supply load Q MW of the coal-fired unit to the power grid system needs to be maintained unchanged. If the energy storage system is stopped at this time, the power load transmitted by the coal-fired unit to the power grid system still cannot meet the dispatching requirements, and the unsatisfied requirements need to be stored or released through the energy storage system. After t+1 minute, the boiler load is adjusted to MW, at which time the energy storage system stores / discharges MW. After t+t minutes, the boiler load is adjusted to Q MW, at which time the energy storage system stores / discharges MW, the above stage is the second stage of load regulation, in which the energy storage system stores a total of MW.

[0070] Finally, the energy storage system stores / discharges in two stages: MW.

[0071] Step 10: Disconnect the line switches directly connecting the energy storage system to the coal-fired units and the power grid system. The energy storage system stops working and the coal-fired units maintain a stable power generation load of 1 MW.

[0072] Please refer to Figure 1 The embodiment of the present invention provides a system 1 for improving the safety of a boiler heating surface, comprising: a coal-fired unit 20, an energy storage system 30, a power grid system 40, and a load control system 10. The load control system 10 is coupled to the coal-fired unit 20, the energy storage system 30, and the power grid system 40, respectively. The coal-fired unit 20 is coupled to the power grid system 40 and the energy storage system 30, respectively, and the energy storage system 30 is coupled to the power grid system 40. The coal-fired unit 20 is configured to send the current operating load of the coal-fired unit to the load control system 10. The load control system 10 is configured to obtain the preset operating load and load of the coal-fired unit according to the dispatching instruction issued by the power grid system 40. The load control system 10 is further configured to generate a first adjustment instruction when the current operating load of the coal-fired unit exceeds the preset operating load, and to generate a second adjustment instruction when the current operating load of the coal-fired unit does not reach the preset operating load. The energy storage system 30 is configured to store the adjustment load provided by the coal-fired unit 20 upon receiving the first adjustment instruction. The energy storage system 30 is further configured to transmit the stored adjustment load to the power grid system 40 upon receiving the second adjustment instruction.

[0073] In one embodiment, the capacity range of the coal-fired unit is 0-1350MW; the energy storage transmission line is a certain voltage level line, and the voltage level is 10kv-500kv.

[0074] The energy storage system includes, but is not limited to, electrochemical energy storage, compressed air energy storage, and flywheel energy storage, which are not specifically limited in this embodiment.

[0075] The boiler can be a pulverized coal boiler, and its combustion mode includes but is not limited to: W-type combustion mode, front and rear counter-compression combustion mode and tangential combustion mode boiler. In addition, the boiler can also be a gas boiler. The embodiment of the present invention does not make specific restrictions on this, and a reasonable selection can be made according to actual needs.

[0076] The preset boiler regulation rate refers to the load regulation rate while ensuring the safety of the boiler heating surface, which can be achieved by controlling the boiler's coal feed, air supply, and water supply. The embodiment of the present invention does not make specific restrictions on this, and it can be selected according to the actual safe operation requirements of the boiler.

[0077] Regulating load refers to the load that needs to be adjusted to ensure the safe operation of the boiler's heating surface. For example, when a coal-fired unit needs to increase its load to the load specified by the grid system's dispatch instructions, the regulated load is the load that needs to be released by the energy storage system to prevent the boiler from increasing its load too quickly. When a coal-fired unit needs to decrease its load to the load specified by the grid system's dispatch instructions, the regulated load is the load stored in the energy storage system to prevent the boiler from decreasing its load too quickly.

[0078] For example, take the No. 1 boiler of a domestic 330MW subcritical unit as an example to illustrate the coal-fired unit:

[0079] The 2×330MW cogeneration project of the State Energy Group Jiuquan Power Generation Co., Ltd. is equipped with a DG1177 / 17.5-Ⅱ13 boiler manufactured by Dongfang Boiler Co., Ltd. This subcritical, tangentially fired, natural circulation drum boiler features a single furnace in a «-shaped» configuration. It burns bituminous coal, features single-stage intermediate reheating, balanced ventilation, solid slag removal, and an all-steel, fully suspended structure. The furnace roof is equipped with a metal rain shield. It can operate in either a constant pressure or fixed-sliding-constant mode. The furnace is 14,706.6mm wide and 13,743.4mm deep. The distance from the headers below the front and rear waterwall walls to the ceiling is 56,300mm. The distance from the primary air nozzle above the burner to the bottom of the large-screen superheater is 19,250mm, and the distance from the primary air nozzle below the burner to the corner of the waterwall ash hopper is 4,453mm. The furnace cross-sectional heat load is 4.449MW / m2 (BMCR), the volumetric heat load is 100.62kW / m3 (BMCR), and the burner area area heat load is 1.562MW / m2 (BMCR).

[0080] The entire furnace is surrounded by fully welded membrane water-cooled walls. Internally threaded tubes are used in areas with high heat loads, i.e. the rear wall from an elevation of 21050mm to an elevation of 50380mm, the middle tube panel on both side walls from an elevation of 21050mm to 42800mm, and the middle two tube panels on the front wall from an elevation of 21050mm to 42800mm use internally threaded tubes, and the rest are plain tubes.

[0081] The superheater system is divided into six stages based on the steam flow: ceiling superheater, wall-wrapped superheater, low-temperature superheater, full-panel superheater, rear-panel superheater, and high-temperature superheater. The superheater system is equipped with a three-stage water spray desuperheater to regulate the superheated steam temperature. The water spray desuperheater utilizes a multi-hole nozzle desuperheater.

[0082] The reheater system is divided into three stages based on the steam flow: wall reheater, medium-temperature reheater, and high-temperature reheater. Emergency water spray desuperheaters are installed on the wall reheater inlet pipe. Two connecting pipes extend from the front wall of the wall reheater outlet header and enter the medium reheater inlet header. These connecting pipes are equipped with fine-tuning water spray desuperheaters. Reheated steam enters the high-temperature reheater through the medium-temperature reheater. No header is installed between the medium and high-temperature reheaters.

[0083] Three sets of low-temperature superheaters and two sets of economizers are arranged from top to bottom in the tail shaft flue. The economizer outlets are equipped with SCR denitrification devices. The boiler is equipped with two Ljungberg air preheaters with a rotor diameter of 10,320 mm.

[0084] The boilers utilize a medium-speed direct-fired pulverizing system. Each boiler is equipped with five medium-speed pulverizers, four in operation and one in standby. The pulverizer model is ZGM95G. The boilers also utilize an air-cooled, dry steel belt deslagging system.

[0085] The main parameters and thermal characteristics of the boiler are shown in Table 1:

[0086] Table 1 Main design parameters of boiler

[0087]

[0088] The coal quality characteristics of the boiler are shown in Table 2:

[0089] Table 2 Fuel characteristic parameters

[0090]

[0091] In this embodiment, by coupling the coal-fired unit 20 and the power grid system 40 with the energy storage system 30, the load control system 10 is coupled to the coal-fired unit 20, the energy storage system 30 and the power grid system 40 respectively, so that the load control system 10 calculates the regulated load according to the preset boiler load regulation rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load regulation time, and finally controls the energy storage system 30 to store or release the load, thereby improving the load rise and fall rate of the boiler, thereby ensuring the safety of the boiler heating surface under deep peak regulation.

[0092] Optionally, the load control system 10 includes: a first load calculation module 110, a second load calculation module 120, and a third load calculation module 130; the load adjustment time includes: a first load adjustment time and a second load adjustment time; the first load calculation module 110 is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, and the first load adjustment time using formula (1) to obtain the first adjustment load; (1); among them, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of times the load is adjusted within the first load adjustment time; the second load calculation module 120 is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time using formula (2) to obtain the second adjustment load; (2); among them, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of times the second load is regulated within the regulation time; the third load calculation module 130 is used to calculate the first regulated load and the second regulated load using formula (3) to obtain the regulated load; (3); Among them, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

[0093] For easier understanding, the following examples are given:

[0094] (1) When the current operating load of the coal-fired unit needs to be reduced to the load required by the power grid system within a certain period of time:

[0095] The coal-fired unit normally operates at a load of 330W, after which the power grid issues a peak-shaving command to the unit. This dispatch instruction requires the unit's load to be reduced from 330MW to 180MW within 15 minutes, meaning a load reduction rate of at least 10MW / minute. The normal boiler manual requires a load reduction rate of no more than 5MW / minute, which is excessive for a boiler. When the boiler's load reduction rate is 5MW / minute or higher, the temperature of the boiler's heating surface changes rapidly, creating unfavorable stress distribution on the heating surface and header, significantly impacting the life of the heating surface. Therefore, it is necessary to control the boiler's coal, air, and water feeds to maintain the boiler's load reduction at 5MW / minute. Therefore, the excess load needs to be stored in the energy storage system. This excess load can be calculated using the following calculation process.

[0096] Phase 1: After calculation, after the first minute, the power supply load of the coal-fired unit to the power grid system is 320MW, and the boiler load is reduced to 325MW. The calculation process is as follows using formula (1): , the first regulating load is calculated to be 5MW, and the energy storage system stores a total of 5MW at this time; after the second minute, the coal-fired unit supplies 310MW to the power grid system, and the boiler load is reduced to 320MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 15MW, and the energy storage system stores a total of 15MW at this time; after the third minute, the coal-fired unit supplies 300MW to the power grid system, and the boiler load is reduced to 315MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 30MW, and the energy storage system stores a total of 30MW at this time; after the fourth minute, the coal-fired unit supplies 290MW to the power grid system, and the boiler load is reduced to 310MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 50MW, and the energy storage system stores a total of 50MW at this time; after the fifth minute, the power supply load of the coal-fired unit to the power grid system is 280MW, and the boiler load is reduced to 305MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 75MW, and the energy storage system stores a total of 75MW at this time; ...; After the 15th minute, the coal-fired unit supplies 180MW to the power grid system, and the boiler load is reduced to 255MW. Using formula (1), the calculation process is: , the first regulated load is calculated to be 600MW, and the energy storage system now stores a total of 600MW.

[0097] Phase 2: After 15 minutes, the energy storage system has stored 600MW. The load supplied to the grid by the coal-fired units is 180MW, and the actual load of the boiler is 255MW. The coal-fired units need to maintain the power supply load of 180MW to the grid, so the boiler needs to continue to reduce the load at a rate of 5MW / minute. After the 16th minute, the boiler load is reduced to 250MW. Using formula (2), the calculation process is: , the second regulating load is calculated to be 70MW, and the energy storage system stores 70MW at this time; after the seventeenth minute, the boiler load is reduced to 245MW, and the calculation process is calculated using formula (2): , the second regulating load is calculated to be 65MW; after the 18th minute, the boiler load is reduced to 240MW, and the calculation process is calculated using formula (2): , the second regulating load is calculated to be 60MW; ....; after the 30th minute, the boiler load is reduced to 180MW, and the calculation process is calculated using formula (2): , the second regulating load is calculated to be 0MW.

[0098] Finally, use formula (3) to calculate, the calculation process is: , the calculated regulated load is 1125M, which is actually 600+70+65+60+55+50+45+35+30+25+15+10+0=1125.

[0099] That is, the coal-fired unit is required to reduce its load from 330MW to 180MW within 15 minutes. While ensuring the safety of the boiler heating surface, the coal-fired unit needs to store a total of 1125MW into the energy storage system.

[0100] (2) When the current operating load of the coal-fired unit needs to be increased to the load required by the power grid system within a certain period of time:

[0101] The coal-fired unit operates at a normal load of 180MW, and then the power grid system issues a peak-shaving instruction to the coal-fired unit. The peak-shaving instruction requires the coal-fired unit load to increase from 180MW to 330MW within 15 minutes, that is, the load increase rate must be at least 10MW / minute. The normal boiler manual requires it to be no more than 5MW / minute, which is very high for the boiler. When the load increase rate is ≥5MW / minute, the wall temperature of the boiler heating surface changes rapidly, and the stress distribution of the heating surface and the header is unfavorable, which has a great impact on the life of the heating surface. Therefore, for the safety of the boiler heating surface, it is necessary to control the boiler coal feed, air volume and water supply to keep the power supply increase rate of the boiler to the power grid system at 5MW / minute. However, the power grid system requires a power supply rate of 10MW / minute. As time goes by, the power supply gap of the coal-fired unit to the power grid system gradually increases, and this part of the gap is filled by the discharge of the energy storage system.

[0102] Phase 1: After calculation, after the first minute, the power supply load of the coal-fired unit to the power grid system is 190MW, and the boiler load increases to 185MW. The calculation process is as follows using formula (1): , the first regulating load is calculated to be 5MW. At this time, the energy storage system needs to transmit a total of 5MW to the power grid system. After the second minute, the power supply load of the coal-fired unit to the power grid system is 200MW, and the boiler load increases to 190MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 15MW. At this time, the energy storage system needs to transmit a total of 15MW to the power grid system. After the third minute, the power supply load of the coal-fired unit to the power grid system is 210MW, and the boiler load increases to 195MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 30MW. At this time, the energy storage system needs to transmit a total of 30MW to the power grid system. After the fourth minute, the power supply load of the coal-fired unit to the power grid system is 220MW, and the boiler load increases to 200MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 50MW. At this time, the energy storage system needs to transmit a total of 50MW to the power grid system. After the fifth minute, the power supply load of the coal-fired unit to the power grid system is 230MW, and the boiler load increases to 205MW. Using formula (1), the calculation process is: , the first regulating load is calculated to be 75MW. At this time, the energy storage system needs to transmit a total of 75MW to the power grid system; .... After the 15th minute, the power supply load of the coal-fired unit to the power grid system is 330MW, and the boiler load increases to 255MW. Using formula (1), the calculation process is: , it is calculated that the first regulating load is 600MW. At this time, the energy storage system needs to transmit a total of 600MW to the power grid system.

[0103] Phase 2: After 15 minutes, the energy storage system has released a total of 600MW. The load supplied to the grid by the coal-fired units is 330MW, and the actual load of the boiler is 255MW. The coal-fired units need to maintain the power supply load of 330MW to the grid, so the boiler needs to continue to increase the load at a rate of 5MW / minute. After the 16th minute, the boiler load increases to 260MW. Using formula (2), the calculation process is: , the second regulating load is calculated to be 70MW. At this time, the energy storage system needs to transmit 70MW to the power grid system. After the 17th minute, the boiler load increases to 265MW. Using formula (2), the calculation process is: , the second regulating load is calculated to be 65MW. At this time, the energy storage system needs to transmit 65MW to the power grid system. After the 18th minute, the boiler load increases to 270MW. Using formula (2), the calculation process is: , the second regulating load is calculated to be 60MW. At this time, the energy storage system needs to transmit 60MW to the power grid system; ....; After the 30th minute, the boiler load increases to 330MW. Using formula (2), the calculation process is: , the second regulating load is calculated to be 0MW, and at this time the energy storage system needs to transmit 0MW to the power grid system.

[0104] Finally, use formula (3) to calculate, the calculation process is: , the calculated regulating load is 1125M, which is actually 600+75+70+65+60+55+50+45+35+30+25+15+10+0=1125,

[0105] That is, the coal-fired unit is required to increase its load from 180MW to 330MW within 15 minutes. While ensuring the safety of the boiler heating surface, the energy storage system needs to transmit a total of 1125MW to the power grid system.

[0106] In this embodiment, the first load calculation module 110 uses formula (1) to calculate the current operating load of the coal-fired unit 20, the preset operating load, the first preset time, and the preset boiler load adjustment rate to obtain the first adjustment load; the second load calculation module 120 uses formula (2) to calculate the current operating load of the coal-fired unit, the preset operating load, the preset boiler load adjustment rate, and the second preset time to obtain the second adjustment load; the third load calculation module 130 uses formula (3) to calculate the first adjustment load and the second adjustment load. (3) That is, the load that the energy storage system 30 needs to store or transport is calculated. After the energy storage system 30 stores or transports the load, the load rise and fall rate of the boiler can be improved, thereby ensuring the safety of the boiler heating surface under deep peak regulation.

[0107] Optionally, the energy storage system 30 also includes: a first on-switch and a second on-switch; the first on-switch is used to control the on-off between the coal-fired unit 20 and the energy storage system 30; the second on-switch is used to control the on-off between the power grid system 40 and the energy storage system 30; when the energy storage system 30 receives the first adjustment instruction, the energy storage system 30 turns on the first on-switch, so that the energy storage system 30 stores the adjustment load provided by the coal-fired unit 20; when the energy storage system 30 receives the second adjustment instruction, the energy storage system 30 turns on the second on-switch, so that the energy storage system 30 transmits the stored adjustment load to the power grid system 40; when the operating load of the coal-fired unit reaches the preset operating load, the energy storage system 30 turns off the first on-switch and the second on-switch, so that the coal-fired unit 20 and the power grid system 40 operate normally.

[0108] In this embodiment, when the energy storage system 30 needs to store or release load, the energy storage system 30 turns on the first switch and the second switch. When the operating load of the coal-fired unit reaches the load required by the power grid system, the energy storage system 30 turns off the first switch and the second switch. This ensures that the energy storage system 30 does not store or release too much load, thereby enabling the coal-fired unit 20 to better participate in the peak-shaving task of the power grid system 40, and better ensures the safety of the boiler heating surface under deep peak-shaving.

[0109] Please refer to Figure 2 , Figure 2 It is a flow chart of a control method for a system for improving the safety of boiler heating surfaces provided by an embodiment of the present invention.

[0110] Based on the same inventive concept, the present invention also provides a control method for improving the safety of a boiler heating surface system, the method comprising the following steps:

[0111] S100, obtaining the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, and the load adjustment time; wherein the preset operating load of the coal-fired unit and the load adjustment time are obtained according to the dispatching instruction issued by the power grid system;

[0112] S200, obtaining an adjusted load based on a preset boiler load adjustment rate, a current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, and a load adjustment time;

[0113] S300, when the current operating load of the coal-fired unit exceeds a preset operating load, generating a first adjustment instruction so that the energy storage system stores the adjustment load provided by the coal-fired unit upon receiving the first adjustment instruction;

[0114] S400 , when the current operating load of the coal-fired unit does not reach the preset operating load, generating a second adjustment instruction so that the energy storage system transmits the stored adjustment load to the power grid system when receiving the second adjustment instruction.

[0115] Optionally, the above step S200 may further include the following steps:

[0116] Obtaining a first regulated load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the first load regulation time, and the preset boiler load regulation rate;

[0117] Obtaining a second adjustment load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the second load adjustment time, and the preset boiler load adjustment rate;

[0118] Based on the first control load and the second control load, a control load is obtained.

[0119] Optionally, the first adjustment load can be obtained in the following manner:

[0120] Using formula (1), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the first load adjustment time are calculated to obtain the first adjustment load; (1); among them, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time.

[0121] Optionally, the second adjustment load can be obtained in the following manner:

[0122] Using formula (2), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time are calculated to obtain the second adjustment load; (2); among them, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time.

[0123] Optionally, the load adjustment may be achieved in the following manner:

[0124] Using formula (3), the first regulating load and the second regulating load are calculated to obtain the regulating load; (3); among them, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

[0125] It can be understood that the specific structure of the system for improving the safety of the boiler heating surface refers to the above-mentioned embodiments. Since the control method for improving the safety of the boiler heating surface provided in this embodiment adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0126] Based on the same inventive concept, the present invention also provides an electronic device, which includes: one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0127] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0128] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0129] Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, which stores instructions, and the instructions are used to execute a program with the following method steps when executed by a processor: obtaining the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load adjustment time; wherein the preset operating load and load adjustment time of the coal-fired unit are obtained according to the scheduling instructions issued by the power grid system; obtaining the adjustment load based on the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load adjustment time; when the current operating load of the coal-fired unit exceeds the preset operating load, generating a first adjustment instruction so that the energy storage system stores the adjustment load provided by the coal-fired unit when receiving the first adjustment instruction; when the current operating load of the coal-fired unit does not reach the preset operating load, generating a second adjustment instruction so that the energy storage system transmits the stored adjustment load to the power grid system when receiving the second adjustment instruction.

[0130] In one embodiment, the control method of the above-mentioned system for improving the safety of boiler heating surfaces also includes: obtaining a first adjustment load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the first load adjustment time and the preset boiler load adjustment rate; obtaining a second adjustment load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the second load adjustment time and the preset boiler load adjustment rate; obtaining an adjustment load based on the first adjustment load and the second adjustment load.

[0131] In one embodiment, the control method for improving the safety of the boiler heating surface system further includes: using formula (1), calculating the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, and the first load adjustment time to obtain the first adjustment load; (1); among them, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time.

[0132] In one embodiment, the control method for improving the safety of the boiler heating surface system further includes: using formula (2), calculating the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, and the second load adjustment time to obtain the second adjustment load; (2); among them, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time.

[0133] In one embodiment, the control method for improving the safety of the boiler heating surface system further includes: using formula (3) to calculate the first regulating load and the second regulating load to obtain the regulating load;

[0134] (3); Among them, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

[0135] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0136] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0139] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0140] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0141] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or apparatus that includes a list of elements includes not only those elements but also elements not explicitly listed.

[0142] In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0143] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A system for improving the safety of boiler heating surfaces, characterized in that: include: A coal-fired unit, an energy storage system, a power grid system, and a load control system, wherein the load control system is coupled to the coal-fired unit, the energy storage system, and the power grid system respectively; the coal-fired unit is coupled to the power grid system and the energy storage system respectively; and the energy storage system is coupled to the power grid system; The coal-fired unit is used to send the current operating load of the coal-fired unit to the load control system; The load control system is used to obtain the preset operating load and load adjustment time of the coal-fired unit according to the dispatching instruction issued by the power grid system, and determine the adjustment load according to the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load adjustment time; The load control system is further configured to generate a first adjustment instruction when the current operating load of the coal-fired unit exceeds the preset operating load; and generating a second adjustment instruction when the current operating load of the coal-fired unit does not reach the preset operating load; The energy storage system is configured to store the regulated load provided by the coal-fired unit upon receiving the first regulation instruction; The energy storage system is further configured to transmit the stored regulated load to the power grid system upon receiving the second regulation instruction.

2. The system for improving boiler heating surface safety according to claim 1, characterized in that: The load control system includes: a first load calculation module, a second load calculation module and a third load calculation module; the load adjustment time includes: a first load adjustment time and a second load adjustment time; The first load calculation module is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the first load adjustment time using formula (1) to obtain a first adjustment load; （1）； in, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time; The second load calculation module is used to calculate the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time using formula (2) to obtain a second adjustment load; （2）； in, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time; The third load calculation module is used to calculate the first regulating load and the second regulating load using formula (3) to obtain the regulating load; (3); in, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

3. The system for improving boiler heating surface safety according to claim 1, characterized in that: The energy storage system includes: a first on-switch and a second on-switch; The first on-off switch is used to control the on-off between the coal-fired unit and the energy storage system; The second on-switch is used to control the on-off between the power grid system and the energy storage system; When the energy storage system receives the first adjustment instruction, the energy storage system turns on the first switch, so that the energy storage system stores the adjustment load provided by the coal-fired unit; When the energy storage system receives the second adjustment instruction, the energy storage system turns on the second switch, so that the energy storage system transmits the stored adjustment load to the power grid system; When the operating load of the coal-fired unit reaches the preset operating load, the energy storage system turns off the first on-switch and the second on-switch, so that the coal-fired unit and the power grid system operate normally.

4. A control method for a system for improving the safety of a boiler heating surface, based on the system for improving the safety of a boiler heating surface according to any one of claims 1 to 3, comprising: Obtaining the current operating load, preset operating load, and load adjustment time of the coal-fired unit; wherein the preset operating load and load adjustment time of the coal-fired unit are obtained according to the adjustment instructions issued by the power grid system; Obtaining a regulated load based on a preset boiler load regulation rate, a current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, and a load regulation time; When the current operating load of the coal-fired unit exceeds the preset operating load, generating a first adjustment instruction so that the energy storage system stores the adjustment load provided by the coal-fired unit upon receiving the first adjustment instruction; When the current operating load of the coal-fired unit does not reach the preset operating load, a second adjustment instruction is generated, so that the energy storage system transmits the stored adjustment load to the power grid system when receiving the second adjustment instruction.

5. The control method for improving the safety of boiler heating surface according to claim 4, characterized in that: The load adjustment time includes: a first load adjustment time and a second load adjustment time; The adjusting load is obtained based on the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the load adjustment time, including: Obtaining a first regulated load based on the current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, a first load regulation time, and a preset boiler load regulation rate; Obtaining a second regulated load based on the current operating load of the coal-fired unit, a preset operating load of the coal-fired unit, a second load regulation time, and a preset boiler load regulation rate; The adjustment load is obtained based on the first adjustment load and the second adjustment load.

6. The control method for improving the safety of boiler heating surface according to claim 5, characterized in that: The first adjustment load is obtained based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the first load adjustment time and the preset boiler load adjustment rate, including: Using formula (1), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the first load adjustment time are calculated to obtain the first adjustment load; （1）； in, Indicates the first regulated load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the first load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the first load adjustment time.

7. The control method for improving the safety of boiler heating surface according to claim 5, characterized in that: The obtaining of the second regulated load based on the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit, the second load regulation time and the preset boiler load regulation rate includes: Using formula (2), the preset boiler load adjustment rate, the current operating load of the coal-fired unit, the preset operating load of the coal-fired unit and the second load adjustment time are calculated to obtain the second adjustment load; （2）； in, Indicates the second regulating load; Indicates the current operating load of the coal-fired unit; Indicates the preset operating load of the coal-fired unit; Indicates the second load adjustment time; Indicates the preset boiler load adjustment rate; Indicates the number of adjustments within the second load adjustment time.

8. The control method for improving the safety of boiler heating surface according to claim 5, characterized in that: The obtaining of the regulation load based on the first regulation load and the second regulation load includes: Using formula (3), the first regulating load and the second regulating load are calculated to obtain the regulating load; (3); in, Indicates regulated load; Indicates the first regulated load; Indicates the second regulation load.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the control method for improving the boiler heating surface safety system according to any one of claims 4 to 8 is executed.

10. A computer-readable storage medium storing computer instructions, characterized in that: When the computer instructions are executed on a computer, the computer is caused to execute the control method for improving the safety of a boiler heating surface according to any one of claims 4 to 8.

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