Thermal power generation coordination control method

Abstract

The invention discloses a thermal power generation coordination control method, which belongs to the technical field of thermal power generation, and comprises the following steps: S1, obtaining the coal inventory of a coal yard; s2, generating capacity is set, and predicted coal consumption is calculated according to the generating capacity; s3, determining the purchased coal quantity according to the coal inventory and the predicted coal consumption; s4, dividing the real-time coal consumption by the actual load to obtain a power-coal ratio; s5, when the load instruction changes, dividing the heat consumption value corresponding to the load instruction by the heat consumption value at the moment of change to obtain a heat consumption coefficient; s6, multiplying the power-coal ratio, the heat consumption coefficient and the load instruction to obtain an accurate coal quantity required in a load instruction change process; s7, calculating according to the real-time accurate coal quantity and the time to obtain a dynamic demand coal quantity; s8, adjusting the purchased coal quantity according to the dynamic demand coal quantity; s9, determining the power generation cost; and S10, determining the purchase cost and the electricity price based on the power generation cost. The inventory is optimized, the power generation benefit can be accurately determined, and the power generation benefit can be increased.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a method for coordinated control of thermal power generation. Background Technology

[0002] Currently, thermal power generation is one of the main methods of power generation, and coal is the primary fuel for thermal power generation. Thermal power plants typically formulate their coal procurement plans based on the coal inventory in their own coal yards. However, the coal consumption of thermal power plants generally varies across different months or seasons. Therefore, a procurement plan solely based on coal inventory can easily lead to over- or under-purchasing of coal, impacting the company's profitability. Furthermore, thermal power plants generally rely on the experience of their technical personnel to judge the coal inventory in their coal yards, resulting in inaccurate inventory levels and potentially unreasonable procurement plans, further affecting the company's efficiency.

[0003] Furthermore, to save costs, various thermal power plants are currently carrying out coal blending to varying degrees, resulting in a complex range of coal types and significant variations in coal quality. At the same time, to meet environmental protection requirements and increasingly stringent requirements from the power grid for primary frequency regulation and AGC (Automatic Generation Control), the main steam pressure of boilers generally fluctuates significantly, especially under variable load conditions. This problem is particularly prominent. One of the most important parameters of the thermal power plant control system is the main steam pressure. Fluctuations in the main steam pressure can cause significant fluctuations in air volume, main steam temperature, oxygen content, furnace negative pressure, and feedwater. Therefore, the stability of the main steam pressure determines the degree of stable combustion of the unit.

[0004] In conventional coordinated control systems, pressure control is typically achieved by the boiler master controller. The boiler master controller uses the load command function as feedforward, which acts as a coarse adjustment for coal quantity during load increases and decreases. Fine adjustment is achieved by correcting the coal quantity using the output of the main steam pressure deviation PID controller. However, in actual operation, it is difficult to guarantee that the calorific value of the coal supplied is the same as the design coal (reflected in the coal quantity function corresponding to the load command). Especially during load increases and decreases, the load command function struggles to accurately specify the coal quantity required for the target load. Therefore, the system passively adjusts the coal quantity through repeated fluctuations in the main steam pressure and the pressure PID controller, ultimately finding a new coal quantity balance point.

[0005] Traditional coordinated control systems do not consider the impact of frequent changes in coal quality on important parameters such as main steam pressure and power of the unit, nor do they make corresponding changes to the control strategy in response to changes in coal quality. Therefore, traditional coordinated control can hardly meet the requirements of the new situation for the control system, and new intelligent control is urgently needed to improve the coordinated control capability. Summary of the Invention

[0006] The purpose of this invention is to provide a coordinated control method for thermal power generation, which can optimize inventory, accurately determine the power generation revenue of completing a preset power generation volume based on electricity price and power generation cost, reduce enterprise costs, and expand the benefits of power plants.

[0007] To achieve the above objectives, the present invention provides a coordinated control method for thermal power generation, comprising the following steps: S1. Obtain the coal inventory in the coal yard of the thermal power plant; S2. Set the power generation during the corresponding power generation period, and calculate the predicted coal consumption during the corresponding power generation period based on the power generation. S3. Determine the amount of coal to be purchased by the thermal power plant based on the coal inventory and the predicted coal consumption. S4. Divide the real-time coal consumption by the actual load to obtain the real-time changing power-to-coal ratio; S5. When the load command changes, divide the heat consumption value corresponding to the load command by the actual heat consumption value at the moment of change to obtain the heat consumption coefficient. S6. Multiply the power-to-coal ratio, heat consumption coefficient and load command at the instant of load command change to obtain the precise amount of coal required during the load command change process. S7. The dynamic coal demand is calculated based on the precise coal quantity required in real time and the time. S8. Adjust the amount of coal purchased based on the dynamic demand for coal to obtain the adjusted amount of coal purchased and the total amount of coal purchased. S9. Determine the power generation cost based on the total amount of coal purchased and the amount of electricity generated; S10. Determine the procurement cost and electricity price for adjusting the amount of coal purchased based on power generation costs.

[0008] Preferably, in S1, a laser coal inventory system is used to acquire coal inventory data of the coal yard, wherein the coal inventory data includes the location, volume and density of coal in the coal yard; the coal inventory is obtained based on the coal volume and density; and 3D map data of the coal yard is generated based on the coal location and coal inventory.

[0009] Preferably, in S4, the values ​​of coal consumption and actual load are the average values ​​within a set time period.

[0010] Preferably, in S5, the range of change for coal consumption, actual load and boiler main steam pressure is set. When each data does not exceed the set range, the unit is determined to be in a stable state, and a steady-state trigger pulse is issued every t1 time. When each data exceeds the set range or every t2 time, the steady-state trigger pulse disappears, and the unit is re-determined to be in a stable state.

[0011] Preferably, when the unit issues a steady-state trigger pulse, the power-to-coal ratio changes in real time, and when the steady-state trigger pulse disappears, the power-to-coal ratio remains at the value at the moment the steady-state trigger pulse disappears.

[0012] Preferably, when the unit issues a steady-state trigger pulse, the heat consumption coefficient is 1. When the steady-state trigger pulse disappears, the heat consumption value at the moment the steady-state trigger pulse disappears is used as the denominator, and the heat consumption value corresponding to the load command is used as the numerator.

[0013] Preferably, in step S8, when the purchased coal is transported to the coal yard by coal trucks, the method further includes: S81. Recalculate and adjust the coal purchase quantity based on coal inventory, coal purchase quantity, and dynamic coal demand. S82. Record the amount of coal purchased from coal trucks, the amount of coal to be unloaded, and the amount of coal already unloaded, and track the location of the unloaded coal. S83. Sum the amount of coal to be unloaded with the amount of coal already unloaded to obtain the actual amount of coal arriving at the plant; S84. Compare the actual amount of coal delivered to the plant with the amount of coal purchased from the plant to determine the coal error. S85. Monitor the location, type, quantity, and quality of coal stored in the coal yard at the current moment. S86. Determine the coal structure composition in the coal yard based on the coal type, the amount of coal corresponding to the coal type, and the coal quality corresponding to the coal type at each coal storage location. S87. Obtain the coal blending and combustion structure required by the boiler. When the coal structure composition in the coal yard does not match the combustion structure, output a correction plan to adjust the amount of coal purchased.

[0014] Preferably, the method further includes: obtaining the coal blending structure of the boiler; adding coal types corresponding to the coal blending structure to the coal mixing bin corresponding to the boiler based on the coal blending structure of the boiler; obtaining the actual coal blending ratio of each coal type leaking from the outlet of the receiving coal mixing bin; and adjusting the coal mixing bin based on the actual coal blending ratio of each coal type.

[0015] Therefore, the present invention adopts the above-mentioned coordinated control method for thermal power generation, which determines the coal purchase quantity of the coal yard based on the coal inventory and the predicted coal consumption, optimizes the inventory, and can accurately determine the power generation revenue of completing the preset power generation based on the electricity price and power generation cost, which is conducive to reducing the cost of power plants and expanding their benefits.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of a coordinated control method for thermal power generation according to the present invention; Figure 2 This is a schematic diagram of 3D map data of the coal yard generated based on the location and inventory of coal in this embodiment. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 like Figure 1 As shown, the present invention provides a coordinated control method for thermal power generation, comprising the following steps: S1. Obtain the coal inventory in the coal yard of the thermal power plant.

[0021] A laser coal inventory system is used to acquire coal inventory data in the coal yard, including coal location, volume, and density. Based on the coal volume and density, the coal inventory is calculated. Finally, 3D map data of the coal yard is generated based on the coal location and inventory. Figure 2 As shown, 3D map data is used to reflect the location, volume, and shape of coal piles in the coal yard.

[0022] S2. Set the power generation within the corresponding power generation period, and calculate the predicted coal consumption within the corresponding power generation period based on the power generation.

[0023] S3. Determine the amount of coal to be purchased by the thermal power plant based on the coal inventory and the predicted coal consumption.

[0024] S4. Divide the real-time coal consumption by the actual load to obtain the real-time changing power-to-coal ratio. The values ​​of coal consumption and actual load are averages over a set time period.

[0025] S5. When the load command changes, divide the heat consumption value corresponding to the load command by the actual heat consumption value at the moment of change to obtain the heat consumption coefficient.

[0026] Specifically, the following steps are taken: set the range of change for coal consumption, actual load, and boiler main steam pressure. When each data point does not exceed the set range, the unit is determined to be in a stable state, and a steady-state trigger pulse is issued every t1 time. When each data point exceeds the set range or every t2 time, the steady-state trigger pulse disappears, and the unit is re-evaluated to determine whether it is in a stable state.

[0027] When the unit issues a steady-state trigger pulse, the power-to-coal ratio changes in real time. When the steady-state trigger pulse disappears, the power-to-coal ratio remains at the value at the moment the steady-state trigger pulse disappears.

[0028] When the unit issues a steady-state trigger pulse, the heat consumption coefficient is 1. When the steady-state trigger pulse disappears, the heat consumption value at the moment the steady-state trigger pulse disappears is used as the denominator, and the heat consumption value corresponding to the load command is used as the numerator.

[0029] S6. Multiply the power-to-coal ratio, heat consumption coefficient, and load command at the instant of load command change to obtain the precise amount of coal required during the load command change process.

[0030] S7. The dynamic coal demand is calculated based on the precise coal quantity required in real time and the time.

[0031] S8. Adjust the amount of coal purchased based on the dynamic demand for coal to obtain the adjusted amount of coal purchased and the total amount of coal purchased.

[0032] When the purchased coal is transported to the coal yard by coal trucks, the method also includes: S81. The amount of coal to be purchased shall be recalculated and adjusted based on the amount of coal in stock, the amount of coal purchased, and the dynamic demand for coal.

[0033] S82. Record the amount of coal purchased from coal trucks, the amount of coal to be unloaded, and the amount of coal already unloaded, and track the location of the unloaded coal.

[0034] S83. Sum the amount of coal to be unloaded with the amount of coal already unloaded to obtain the actual amount of coal arriving at the plant.

[0035] S84. Compare the actual amount of coal delivered to the plant with the amount of coal purchased from the plant to determine the coal error.

[0036] S85. Monitor the location, type, quantity, and quality of coal stored in the coal yard at the current moment.

[0037] S86. Determine the coal structure composition in the coal yard based on the coal type, the amount of coal corresponding to the coal type, and the coal quality corresponding to the coal type at each coal storage location.

[0038] S87. Obtain the coal blending and combustion structure required by the boiler. When the coal structure composition in the coal yard does not match the combustion structure, output a correction plan to adjust the amount of coal purchased.

[0039] S88. Obtain the coal blending and combustion structure of the boiler.

[0040] S89. Based on the coal blending and combustion structure of the boiler, add coal types corresponding to the coal combustion structure to the coal mixing bin corresponding to the boiler. S810. Obtain the actual coal blending ratio of each type of coal leaking from the outlet of the coal mixing bin, and adjust the coal mixing bin based on the actual coal blending ratio of each type of coal.

[0041] S9. Determine the power generation cost based on the total amount of coal purchased and the amount of electricity generated.

[0042] S10. Determine the procurement cost and electricity price for adjusting the amount of coal purchased based on power generation costs.

[0043] Therefore, the present invention adopts the above-mentioned coordinated control method for thermal power generation, which determines the coal purchase quantity of the coal yard based on the coal inventory and the predicted coal consumption, optimizes the inventory, and can accurately determine the power generation revenue of completing the preset power generation based on the electricity price and power generation cost, which is conducive to reducing the cost of power plants and expanding their benefits.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for coordinated control of thermal power generation, characterized in that, Includes the following steps: S1. Obtain the coal inventory in the coal yard of the thermal power plant; S2. Set the power generation during the corresponding power generation period, and calculate the predicted coal consumption during the corresponding power generation period based on the power generation. S3. Determine the amount of coal to be purchased by the thermal power plant based on the coal inventory and the predicted coal consumption. S4. Divide the real-time coal consumption by the actual load to obtain the real-time changing power-to-coal ratio; S5. When the load command changes, divide the heat consumption value corresponding to the load command by the actual heat consumption value at the moment of change to obtain the heat consumption coefficient. S6. Multiply the power-to-coal ratio, heat consumption coefficient and load command at the instant of load command change to obtain the precise amount of coal required during the load command change process. S7. The dynamic coal demand is calculated based on the precise coal quantity required in real time and the time. S8. Adjust the amount of coal purchased based on the dynamic demand for coal to obtain the adjusted amount of coal purchased and the total amount of coal purchased. S9. Determine the power generation cost based on the total amount of coal purchased and the amount of electricity generated; S10. Determine the procurement cost and electricity price for adjusting the amount of coal purchased based on power generation costs.

2. The method for coordinated control of thermal power generation according to claim 1, characterized in that: In S1, a laser coal inventory system is used to acquire coal inventory data of the coal yard. The coal inventory data includes the location, volume and density of coal in the coal yard; the coal inventory is obtained based on the coal volume and density; and 3D map data of the coal yard is generated based on the coal location and coal inventory.

3. The method for coordinated control of thermal power generation according to claim 1, characterized in that: In S4, the values ​​of coal consumption and actual load are the average values ​​over a set time period.

4. The method for coordinated control of thermal power generation according to claim 1, characterized in that: In S5, the range of change for coal consumption, actual load, and boiler main steam pressure is set. When the data does not exceed the set range, the unit is determined to be in a stable state, and a steady-state trigger pulse is issued every t1 time. When the data exceeds the set range or every t2 time, the steady-state trigger pulse disappears, and the unit is re-determined to be in a stable state.

5. The method for coordinated control of thermal power generation according to claim 4, characterized in that: When the unit issues a steady-state trigger pulse, the power-to-coal ratio changes in real time. When the steady-state trigger pulse disappears, the power-to-coal ratio remains at the value at the moment the steady-state trigger pulse disappears.

6. The method for coordinated control of thermal power generation according to claim 4, characterized in that: When the unit issues a steady-state trigger pulse, the heat consumption coefficient is 1. When the steady-state trigger pulse disappears, the heat consumption value at the moment the steady-state trigger pulse disappears is used as the denominator, and the heat consumption value corresponding to the load command is used as the numerator.

7. The method for coordinated control of thermal power generation according to claim 1, characterized in that: In S8, when the purchased coal is transported to the coal yard by coal trucks, the method also includes: S81. Recalculate and adjust the coal purchase quantity based on coal inventory, coal purchase quantity, and dynamic coal demand. S82. Record the amount of coal purchased from coal trucks, the amount of coal to be unloaded, and the amount of coal already unloaded, and track the location of the unloaded coal. S83. Sum the amount of coal to be unloaded with the amount of coal already unloaded to obtain the actual amount of coal arriving at the plant; S84. Compare the actual amount of coal delivered to the plant with the amount of coal purchased from the plant to determine the coal error. S85. Monitor the location, type, quantity, and quality of coal stored in the coal yard at the current moment. S86. Determine the coal structure composition in the coal yard based on the coal type, the amount of coal corresponding to the coal type, and the coal quality corresponding to the coal type at each coal storage location. S87. Obtain the coal blending and combustion structure required by the boiler. When the coal structure composition in the coal yard does not match the combustion structure, output a correction plan to adjust the amount of coal purchased.

8. The method for coordinated control of thermal power generation according to claim 7, characterized in that: Also includes: To obtain the coal blending and combustion structure of the boiler; Based on the coal blending and combustion structure of the boiler, coal types corresponding to the coal blending structure are added to the coal blending bins corresponding to the boiler. Obtain the actual coal blending ratio of each type of coal leaking from the outlet of the receiving coal mixing bin; Adjust the coal blending bins based on the actual coal blending ratios of each coal type.

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