Capacity determination method and system based on combined peak regulation of electric boilers

Abstract

The invention relates to the technical field of peak regulation of cogeneration units, in particular to a capacity determination method and system based on combined peak regulation of electric boilers. The capacity determination method comprises the steps that a combined peak regulation simulation model is established, a first heat exchange parameter of condensed water entering a heat exchanger in a coal-fired unit in a non-heat-supply-season high-electricity-price period is obtained, and a second heat exchange parameter of condensed water entering a heat exchanger in the non-heat-supply-season high-electricity-price period is obtained according to the outlet water temperature of an electric boiler in a non-heat-supply-season low-electricity-price period. According to the first heat exchange parameter and the second heat exchange parameter, the capacity of the heat exchanger is calculated according to the first heat exchange parameter and the second heat exchange parameter, the duration of the high electricity price period in the non-heat-supply season is obtained, and the capacity of the heat storage water tank is calculated according to the duration of the high electricity price period and the capacity of the heat exchanger. According to the method, the defects of system redundancy, energy efficiency waste, low return on investment and the like caused by misalignment of capacity planning of an existing electric boiler combined peak regulation system are overcome by quantitatively matching equipment type selection and load requirements of a coal-fired unit.

Description

Technical Field

[0001] The present invention relates to the technical field of peak shaving for combined heat and power units, and particularly to a method and system for determining the capacity based on combined peak shaving of electric boilers. Background Art

[0002] Combined heat and power units are the main heating heat sources in northern cities in winter. The rapidly growing heating demand in urban development and construction makes the heat load of the units often at a relatively high level during the heating season. Due to the inherent constraints of thermoelectric coupling in combined heat and power units, the electric output of the units is relatively high during the heating season. In winter, the wind resources in the northern regions are rich, and the power generation of new energy such as wind power is high, which brings great difficulties to the consumption of new energy. Therefore, each power generation enterprise has successively taken a series of measures to decouple heat and electricity in combined heat and power units. On the basis of ensuring the heating needs of people's livelihood, the power generation output of the units is reduced, so that the units have flexible peak shaving capabilities.

[0003] At present, some power generation enterprises have adopted the technical route of electric boiler peak shaving, that is, installing high-power electro-thermal conversion equipment on the side of combined heat and power units, using the self-provided power in the factory, and converting the deeply peak-shaved power of the factory into heat energy before the gateway meter, which can effectively solve the contradiction between power grid peak shaving and people's livelihood power supply, and resolve the problems of abandoned wind and abandoned light in the "Three-North" regions. However, at present, the electric boilers added in power plants are only used for heat and electricity decoupling in the heating season, and the equipment is shut down in the non-heating season, resulting in low equipment utilization rate. Therefore, it is necessary to improve the existing electric boiler peak shaving system so that it can also be put into operation in the non-heating season. However, at present, there is a lack of scientific basis for determining the capacity of heat exchangers and hot water storage tanks in the electric boiler system during the non-heating season, resulting in problems such as great blindness in the transformation plan of the electric boiler peak shaving system, unreasonable investment decisions, and low technical economy. Summary of the Invention

[0004] The technical problem to be solved in the embodiments of the present invention is to provide a method and system for determining the capacity based on combined peak shaving of electric boilers, so as to solve the problems in the prior art that due to the unreasonable determination of the capacity of heat exchangers and hot water storage tanks in the electric boiler system during the non-heating season, the transformation plan of the electric boiler peak shaving system is blindly large, the investment decision is unreasonable, and the technical economy is low.

[0005] The present invention discloses a method for determining the capacity based on combined peak shaving of electric boilers, including: Establishing a combined peak shaving simulation model, where the combined peak shaving simulation model includes mathematical models of coal-fired units, electric boilers, hot water storage tanks, and heat exchangers; Obtaining the first heat transfer parameters of the condensate in the coal-fired unit entering the heat exchanger during high electricity price periods in the non-heating season, where the first heat transfer parameters include the flow rate and water temperature of the condensate; According to the outlet water temperature of the electric boiler during the low electricity price period in the non-heating season, obtain the second heat transfer parameter of the circulating water in the heat storage water tank entering the heat exchanger during the high electricity price period in the non-heating season. The second heat transfer parameter includes the water temperature of the circulating water. Calculate the capacity of the heat exchanger based on the obtained first heat transfer parameter and the second heat transfer parameter. The capacity calculation formula of the heat exchanger is:

[0006] In the formula, represents the capacity of the heat exchanger, represents the constant pressure specific heat capacity of water, represents the inlet water temperature of the condensate flowing into the heat exchanger, represents the outlet water temperature of the condensate flowing out of the heat exchanger, represents the flow rate of the condensate flowing into the heat exchanger; Obtain the duration of the high electricity price period in the non-heating season. Calculate the capacity of the heat storage water tank based on the duration of the high electricity price period and the capacity of the heat exchanger. The capacity calculation formula of the heat storage water tank is:

[0007] In the formula, represents the capacity of the heat storage water tank, represents the inlet water temperature of the circulating water flowing into the heat exchanger, represents the outlet water temperature of the circulating water flowing out of the heat exchanger, represents the duration of the high electricity price period.

[0008] Optionally, the capacity determination method further includes a method for determining the flow rate when the condensate flows into the heat exchanger, including: According to the operation data and trading electricity price statistical data of the coal-fired unit during the high electricity price period in the non-heating season, obtain the load benchmark of the coal-fired unit during the high electricity price period; Obtain the flow rate of the condensate in the coal-fired unit under the load benchmark, and determine the flow rate of the condensate flowing into the heat exchanger based on the obtained condensate flow rate. The calculation formula for the flow rate of the condensate flowing into the heat exchanger is:

[0009] In the formula, represents the load benchmark of the coal-fired unit during the high electricity price period, represents the condensate flow rate of the coal-fired unit under the load benchmark, represents the flow function for the variable .

[0010] Optionally, the capacity determination method further includes a method for determining the inlet water temperature when the condensate flows into the heat exchanger, including: According to the operation data and transaction electricity price statistical data of the coal-fired unit during the high electricity price period in the non-heating season, obtain the load benchmark of the coal-fired unit during the high electricity price period; Obtain the water temperature of the condensate in the coal-fired unit under the load benchmark, and determine the inlet water temperature of the condensate flowing into the heat exchanger according to the obtained condensate water temperature. The calculation formula for the condensate inlet water temperature is:

[0011] In the formula, represents the load benchmark of the coal-fired unit during the high electricity price period, represents the condensate water temperature of the coal-fired unit under the load benchmark, represents a temperature function for the variable

[0012] Optionally, the capacity determination method further includes a method for determining the outlet water temperature when the condensate flows out of the heat exchanger, including: Determine the inlet water temperature of the circulating water flowing into the heat exchanger according to the outlet water temperature of the electric boiler during the low electricity price period in the non-heating season. The function expression of the circulating water inlet water temperature is:

[0013] In the formula, represents the outlet water temperature of the electric boiler; Determine the first terminal difference of the heat exchanger according to the design parameters of the heat exchanger; Calculate the outlet water temperature of the condensate flowing out of the heat exchanger according to the first terminal difference and the inlet water temperature of the circulating water. The calculation formula for the condensate outlet water temperature is:

[0014] In the formula, represents the first terminal difference of the heat exchanger.

[0015] Optionally, the capacity determination method further includes a method for determining the outlet water temperature when the circulating water flows out of the heat exchanger, including: Determine the second terminal difference of the heat exchanger according to the design parameters of the heat exchanger; Calculate the outlet water temperature of the circulating water flowing out of the heat exchanger according to the second terminal difference and the inlet water temperature of the condensate. The calculation formula for the circulating water outlet water temperature is:

[0016] In the formula,​ Represents the second terminal difference of the heat exchanger.

[0017] Optionally, the capacity determination method further includes a method for determining the flow rate of the circulating water flowing into the heat exchanger, including: Based on the inlet water temperature and outlet water temperature of the circulating water, and the capacity of the heat exchanger, calculate the flow rate of the circulating water flowing into the heat exchanger. The calculation formula for the circulating water flow rate is:

[0018] In the formula, Represents the flow rate of the circulating water flowing into the heat exchanger.

[0019] Optionally, the establishment of the combined peak shaving simulation model includes: Select the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger of a preset model, and obtain the historical operation data of the coal-fired unit and the electric boiler; According to the obtained multiple historical operation data, establish simulation models of the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger respectively, and define the connection relationships between the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger; According to the historical operation data of the coal-fired unit during the non-heating season and the historical transaction electricity price statistical data, run the simulation model to simulate the peak shaving scenarios at different electricity price periods, and obtain the combined peak shaving simulation model.

[0020] Optionally, the definition of the connection relationships between the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger includes: Define that the power generation output end of the coal-fired unit is electrically connected to the electric boiler, and define that the hot water storage tank is heat exchange connected to the electric boiler, which is used to simulate the heating of the circulating water in the hot water storage tank by the electric boiler during the low electricity price period in the non-heating season; Define that the condensate water at the outlet of the coal-fired unit is heat exchange connected to the cold side of the heat exchanger, and define that the hot water storage tank is heat exchange connected to the hot side of the heat exchanger, which is used to simulate the heating of the condensate water by the heated circulating water during the high electricity price period in the non-heating season.

[0021] The present invention also discloses a capacity determination system, which adopts the above-mentioned capacity determination method based on combined peak shaving of an electric boiler. The system is characterized in that it includes: A model establishment module, which is used to establish a combined peak shaving simulation model. The combined peak shaving simulation model includes the mathematical models of a coal-fired unit, an electric boiler, a hot water storage tank, and a heat exchanger; The first heat transfer parameter acquisition module is used to acquire the first heat transfer parameters of the condensate water entering the heat exchanger in the coal-fired unit during high electricity price periods in the non-heating season. The first heat transfer parameters include the flow rate and water temperature of the condensate water. The second heat transfer parameter acquisition module acquires the second heat transfer parameters of the circulating water in the heat storage water tank entering the heat exchanger during high electricity price periods in the non-heating season according to the outlet water temperature of the electric boiler during low electricity price periods in the non-heating season. The second heat transfer parameters include the water temperature of the circulating water. The heat exchanger capacity determination module is used to calculate the capacity of the heat exchanger according to the acquired first heat transfer parameters and second heat transfer parameters. The heat storage water tank capacity determination module is used to acquire the duration of high electricity price periods in the non-heating season and calculate the capacity of the heat storage water tank according to the duration of the high electricity price periods and the capacity of the heat exchanger.

[0022] The present invention also discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned capacity determination method applied to combined peak shaving based on an electric boiler are realized.

[0023] Compared with the prior art, the beneficial effects of the capacity determination method and peak shaving method for combined peak shaving based on an electric boiler provided by the embodiments of the present invention are as follows: By establishing a combined peak shaving simulation model and combining trading electricity price periods, the heat transfer parameters of the heat exchanger for heating up the condensate water in the coal-fired unit and the heat storage water tank are acquired during high electricity price periods in the non-heating season, so as to determine the optimal matching capacities of the heat exchanger and the heat storage water tank. Thus, by quantifying the matching of equipment selection and the load demand of the coal-fired unit, defects such as system redundancy or insufficiency, energy efficiency waste, and low return on investment caused by inaccurate capacity planning in the prior art system for combined peak shaving based on an electric boiler are solved. Furthermore, the optimal design of the electric boiler peak shaving system transformation plan and the efficient allocation of resources are realized. Description of the Drawings

[0024] The technical solutions of the present invention will be further described in detail below in conjunction with the drawings and embodiments. In the drawings: Figure 1 is a schematic diagram of the overall structure of the capacity determination method for combined peak shaving based on an electric boiler provided by the embodiments of the present invention; Figure 2 is a schematic diagram of the heat exchange connection structure of the coal-fired unit, electric boiler, heat storage water tank, and heat exchanger provided by the embodiments of the present invention.

[0025] The reference numerals in the drawings are as follows: 1. Coal-fired unit; 2. Electric boiler; 3. Heat storage water tank; 4. Heat exchanger. Detailed Embodiments

[0026] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0027] The present invention discloses a method for determining the capacity based on the combined peak shaving of an electric boiler, as Figure 1 shown, including: S1. Establish a combined peak shaving simulation model, where the combined peak shaving simulation model includes the mathematical models of a coal-fired unit 1, an electric boiler 2, a hot water storage tank 3, and a heat exchanger 4; S2. Obtain the first heat transfer parameters when the condensate water in the coal-fired unit 1 enters the heat exchanger 4 during the high electricity price period in the non-heating season. The first heat transfer parameters include the flow rate and water temperature of the condensate water; S3. According to the outlet water temperature of the electric boiler 2 during the low electricity price period in the non-heating season, obtain the second heat transfer parameters when the circulating water in the hot water storage tank 3 enters the heat exchanger 4 during the high electricity price period in the non-heating season. The second heat transfer parameters include the water temperature of the circulating water; S4. According to the obtained first heat transfer parameters and second heat transfer parameters, calculate the capacity of the heat exchanger 4. The capacity calculation formula of the heat exchanger 4 is:

[0028] In the formula, represents the capacity of the heat exchanger 4, represents the constant pressure specific heat capacity of water, represents the inlet water temperature of the condensate water flowing into the heat exchanger 4, represents the outlet water temperature of the condensate water flowing out of the heat exchanger 4, represents the flow rate of the condensate water flowing into the heat exchanger 4; S5. Obtain the duration of the high electricity price period in the non-heating season. According to the duration of the high electricity price period and the capacity of the heat exchanger 4, calculate the capacity of the hot water storage tank 3. The capacity calculation formula of the hot water storage tank 3 is:

[0029] In the formula, represents the capacity of the hot water storage tank 3, represents the inlet water temperature of the circulating water flowing into the heat exchanger 4, represents the outlet water temperature of the circulating water flowing out of the heat exchanger 4, represents the duration of the high electricity price period.

[0030] Through the implementation of the above embodiments of the method for determining the capacity of the combined peak shaving based on the electric boiler 2, by establishing a combined peak shaving simulation model and combining with the historical trading electricity price periods, when obtaining the high electricity price periods in the non-heating season, the heat exchanger 4 for heating up the condensate in the coal-fired unit 1 and the heat exchange parameters of the hot water storage tank 3 are obtained, and according to the obtained heat exchange parameters, the optimal matching capacities of the heat exchanger 4 and the hot water storage tank 3 are respectively determined through calculation, so as to solve the defects such as system redundancy or insufficiency, energy efficiency waste and low return on investment caused by inaccurate capacity planning in the existing system of combined peak shaving based on the electric boiler, and further realize the optimal design of the electric boiler peak shaving system transformation plan and the efficient allocation of resources.

[0031] Further, the capacity determination method further includes a method for determining the flow rate when the condensate flows into the heat exchanger 4, including: According to the operation data of the coal-fired unit 1 and the trading electricity price statistical data during the high electricity price periods in the non-heating season, obtain the load benchmark of the coal-fired unit 1 during the high electricity price periods; Obtain the flow rate of the condensate in the coal-fired unit 1 under the load benchmark, and according to the obtained condensate flow rate, determine the flow rate of the condensate flowing into the heat exchanger 4. The calculation formula for the flow rate of the condensate flowing into the heat exchanger 4 is:

[0032] In the formula, represents the load benchmark of the coal-fired unit during the high electricity price periods, represents the condensate flow rate in the coal-fired unit under the load benchmark, represents the flow rate function for the variable .

[0033] Further, the capacity determination method further includes a method for determining the inlet water temperature when the condensate flows into the heat exchanger 4, including: According to the operation data of the coal-fired unit 1 and the trading electricity price statistical data during the high electricity price periods in the non-heating season, obtain the load benchmark of the coal-fired unit 1 during the high electricity price periods; Obtain the water temperature of the condensate in the coal-fired unit 1 under the load benchmark, and according to the obtained condensate water temperature, determine the inlet water temperature of the condensate flowing into the heat exchanger 4. The calculation formula for the condensate inlet water temperature is:

[0034] In the formula, represents the load benchmark of the coal-fired unit during the high electricity price periods, represents the condensate water temperature in the coal-fired unit under the load benchmark, represents the temperature function for the variable .

[0035] Further, the capacity determination method further includes a method for determining the outlet water temperature when the condensate water flows out of the heat exchanger 4, including: According to the outlet water temperature of the electric boiler 2 during the low electricity price period in the non-heating season, determine the inlet water temperature of the circulating water flowing into the heat exchanger 4. The functional expression of the circulating water inlet water temperature is:

[0036] In the formula, represents the outlet water temperature of the electric boiler 2; According to the heat exchanger design parameters, determine the first temperature difference of the heat exchanger; According to the first temperature difference and the inlet water temperature of the circulating water, calculate the outlet water temperature of the condensate water flowing out of the heat exchanger 4. The calculation formula of the condensate water outlet water temperature is:

[0037] In the formula, represents the first temperature difference of the heat exchanger 4.

[0038] Further, the capacity determination method further includes a method for determining the outlet water temperature when the circulating water flows out of the heat exchanger 4, including: According to the heat exchanger design parameters, determine the second temperature difference of the heat exchanger; According to the second temperature difference and the inlet water temperature of the condensate water, calculate the outlet water temperature of the circulating water flowing out of the heat exchanger 4. The calculation formula of the circulating water outlet water temperature is:

[0039] In the formula, represents the second temperature difference of the heat exchanger 4.

[0040] Further, the capacity determination method further includes a method for determining the flow rate of the circulating water flowing into the heat exchanger 4, including: According to the inlet water temperature and outlet water temperature of the circulating water, and the capacity of the heat exchanger 4, calculate the flow rate of the circulating water flowing into the heat exchanger 4. The calculation formula of the circulating water flow rate is:

[0041] In the formula, represents the flow rate of the circulating water flowing into the heat exchanger 4.

[0042] Further, establish a combined peak shaving simulation model, including: Select a coal-fired unit 1, an electric boiler 2, a hot water storage tank 3, and a heat exchanger 4 of a preset model, and obtain the historical operation data of the coal-fired unit 1 and the electric boiler 2; According to multiple pieces of historical operation data obtained, simulation models of a coal-fired unit 1, an electric boiler 2, a hot water storage tank 3, and a heat exchanger 4 are correspondingly established, and the connection relationships among the coal-fired unit 1, the electric boiler 2, the hot water storage tank 3, and the heat exchanger 4 are defined; According to the historical operation data of the coal-fired unit 1 during the non-heating season and the historical transaction electricity price statistical data, the simulation model is run to simulate the peak shaving scenarios at different electricity price periods, and a combined peak shaving simulation model is obtained.

[0043] Further, in combination with Figure 2 as shown, the connection relationships among the coal-fired unit 1, the electric boiler 2, the hot water storage tank 3, and the heat exchanger 4 are defined, including: It is defined that the power generation output end of the coal-fired unit 1 is electrically connected to the electric boiler 2, and it is defined that the hot water storage tank 3 is heat exchange-connected to the electric boiler 2, which is used to simulate the heating of the circulating water in the hot water storage tank 3 by the operation of the electric boiler 2 in response to the low electricity price period in the non-heating season; It is defined that the condensate water at the outlet of the coal-fired unit 1 is heat exchange-connected to the cold side of the heat exchanger 4, and it is defined that the hot water storage tank 3 is heat exchange-connected to the hot side of the heat exchanger 4, which is used to simulate the heating of the condensate water by the heated circulating water in response to the high electricity price period in the non-heating season.

[0044] The present invention also discloses a capacity determination system, which adopts the above-mentioned capacity determination method based on combined peak shaving of an electric boiler. The system is characterized in that it includes: A model establishment module, which is used to establish a combined peak shaving simulation model. The combined peak shaving simulation model includes the mathematical models of the coal-fired unit 1, the electric boiler 2, the hot water storage tank 3, and the heat exchanger 4; A first heat exchange parameter acquisition module, which is used to acquire the first heat exchange parameters of the condensate water entering the heat exchanger 4 in the coal-fired unit 1 during the high electricity price period in the non-heating season. The first heat exchange parameters include the flow rate and water temperature of the condensate water; A second heat exchange parameter acquisition module, which acquires the second heat exchange parameters of the circulating water in the hot water storage tank 3 entering the heat exchanger 4 during the high electricity price period in the non-heating season according to the outlet water temperature of the electric boiler 2 during the low electricity price period in the non-heating season. The second heat exchange parameters include the water temperature of the circulating water; A heat exchanger 4 capacity determination module, which is used to calculate the capacity of the heat exchanger 4 according to the acquired first heat exchange parameters and second heat exchange parameters; A hot water storage tank 3 capacity determination module, which is used to acquire the duration of the high electricity price period in the non-heating season and calculate the capacity of the hot water storage tank 3 according to the duration of the high electricity price period and the capacity of the heat exchanger 4.

[0045] The present invention also discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned capacity determination method applied to combined peak shaving of an electric boiler are realized.

[0046] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to specific embodiments. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device generate means for implementing the specified functions in one or more of the flows Figure 1 one or more flows and / or blocks Figure 1 or in one or more of the blocks.

[0047] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the specified functions in one or more of the flows Figure 1 one or more flows and / or blocks Figure 1 or in one or more of the blocks.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are performed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in one or more of the flows Figure 1 one or more flows and / or blocks Figure 1 or in one or more of the blocks.

[0049] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments or perform equivalent replacements for some of the technical features; and all such modifications and replacements should fall within the protection scope of the present invention.

Claims

1. A method for determining the capacity based on combined peak shaving of an electric boiler, characterized in that, The method for determining the capacity based on the combined peak shaving of an electric boiler includes: Establishing a combined peak shaving simulation model, which includes the mathematical models of a coal-fired unit, an electric boiler, a hot water storage tank, and a heat exchanger; Obtaining the first heat transfer parameters of the condensate water in the coal-fired unit entering the heat exchanger during high electricity price periods in the non-heating season, where the first heat transfer parameters include the flow rate and water temperature of the condensate water; According to the outlet water temperature of the electric boiler during low electricity price periods in the non-heating season, obtaining the second heat transfer parameters of the circulating water in the hot water storage tank entering the heat exchanger during high electricity price periods in the non-heating season, where the second heat transfer parameters include the water temperature of the circulating water; Calculating the capacity of the heat exchanger based on the obtained first heat transfer parameters and the second heat transfer parameters. The capacity calculation formula of the heat exchanger is: In the formula, represents the capacity of the heat exchanger, represents the specific heat capacity of water at constant pressure, represents the inlet water temperature of the condensate flowing into the heat exchanger, represents the outlet water temperature of the condensate flowing out of the heat exchanger, represents the flow rate of the condensate flowing into the heat exchanger; Obtaining the duration of high electricity price periods in the non-heating season, and calculating the capacity of the hot water storage tank based on the duration of high electricity price periods and the capacity of the heat exchanger. The capacity calculation formula of the hot water storage tank is: In the formula, represents the capacity of the heat storage water tank, represents the inlet water temperature of the circulating water flowing into the heat exchanger, represents the outlet water temperature of the circulating water flowing out of the heat exchanger, represents the duration of the high electricity price period.

2. The capacity determination method based on combined peak shaving of electric boilers according to claim 1, wherein The capacity determination method further includes a method for determining the flow rate when the condensate water flows into the heat exchanger, including: According to the operation data and trading electricity price statistical data of the coal-fired unit during high electricity price periods in the non-heating season, obtaining the load benchmark of the coal-fired unit during high electricity price periods; Obtaining the flow rate of the condensate water in the coal-fired unit under the load benchmark, and determining the flow rate of the condensate water flowing into the heat exchanger based on the obtained flow rate of the condensate water. The calculation formula for the flow rate of the condensate water flowing into the heat exchanger is: In the formula, represents the load reference during the high electricity price period of the coal-fired unit, represents the condensate flow rate of the coal-fired unit under the load reference, represents the flow function for the variable ​ 3. The capacity determination method based on combined peak shaving of electric boilers according to claim 1, characterized in that The capacity determination method further includes a method for determining the inlet water temperature when the condensate water flows into the heat exchanger, including: According to the operation data and trading electricity price statistical data of the coal-fired unit during high electricity price periods in the non-heating season, obtaining the load benchmark of the coal-fired unit during high electricity price periods; Obtaining the water temperature of the condensate water in the coal-fired unit under the load benchmark, and determining the inlet water temperature of the condensate water flowing into the heat exchanger based on the obtained water temperature of the condensate water. The calculation formula for the inlet water temperature of the condensate water is: In the formula, represents the load benchmark during the high electricity price period of the coal-fired unit, represents the condensate water temperature of the coal-fired unit under the load benchmark, represents the temperature function for the variable ​ 4. The capacity determination method based on combined peak shaving of electric boilers according to claim 1, characterized in that The capacity determination method further includes a method for determining the outlet water temperature when the condensate water flows out of the heat exchanger, including: Determining the inlet water temperature of the circulating water flowing into the heat exchanger according to the outlet water temperature of the electric boiler during low electricity price periods in the non-heating season. The functional expression for the inlet water temperature of the circulating water is: In the formula, represents the outlet water temperature of the electric boiler; Determining the first terminal temperature difference of the heat exchanger according to the design parameters of the heat exchanger; Calculating the outlet water temperature of the condensate water flowing out of the heat exchanger based on the first terminal temperature difference and the inlet water temperature of the circulating water. The calculation formula for the outlet water temperature of the condensate water is: In the formula, represents the first terminal difference of the heat exchanger.

5. The capacity determination method based on combined peak shaving of electric boilers according to claim 4, characterized in that The capacity determination method further includes a method for determining the outlet water temperature when the circulating water flows out of the heat exchanger, including: Determining the second terminal temperature difference of the heat exchanger according to the design parameters of the heat exchanger; Calculating the outlet water temperature of the circulating water flowing out of the heat exchanger based on the second terminal temperature difference and the inlet water temperature of the condensate water. The calculation formula for the outlet water temperature of the circulating water is: In the formula, represents the second terminal difference of the heat exchanger.

6. The capacity determination method based on combined peak shaving of electric boilers according to claim 5, characterized in that, The capacity determination method further includes a method for determining the flow rate of the circulating water flowing into the heat exchanger, including: According to the inlet water temperature and outlet water temperature of the circulating water, as well as the capacity of the heat exchanger, the flow rate of the circulating water flowing into the heat exchanger is calculated. The calculation formula for the circulating water flow rate is as follows: In the formula, represents the flow rate of the circulating water flowing into the heat exchanger.

7. The capacity determination method based on combined peak shaving of electric boilers according to claim 1, characterized in that The establishment of the combined peak shaving simulation model includes: Select the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger of a preset model, and obtain the historical operation data of the coal-fired unit and the electric boiler; According to the obtained multiple historical operation data, establish the simulation models of the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger respectively, and define the connection relationships among the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger; According to the historical operation data of the coal-fired unit during the non-heating season and the historical transaction electricity price statistical data, run the simulation model to simulate the peak shaving scenarios at different electricity price periods, and obtain the combined peak shaving simulation model.

8. The capacity determination method based on combined peak shaving of electric boilers according to claim 7, characterized in that, The definition of the connection relationships among the coal-fired unit, the electric boiler, the hot water storage tank, and the heat exchanger includes: Define that the power generation output end of the coal-fired unit is electrically connected to the electric boiler, and define that the hot water storage tank is heat exchange connected to the electric boiler, which is used to simulate the heating of the circulating water in the hot water storage tank by the electric boiler during the low electricity price period in the non-heating season; Define that the condensate water at the outlet of the coal-fired unit is heat exchange connected to the cold side of the heat exchanger, and define that the hot water storage tank is heat exchange connected to the hot side of the heat exchanger, which is used to simulate the heating of the condensate water by the heated circulating water during the high electricity price period in the non-heating season.

9. A system for determining capacity, which adopts the method for determining capacity based on combined peak shaving of an electric boiler according to any one of claims 1-8, wherein, The system includes: A model establishment module for establishing a combined peak shaving simulation model, where the combined peak shaving simulation model includes the mathematical models of a coal-fired unit, an electric boiler, a hot water storage tank, and a heat exchanger; A first heat exchange parameter acquisition module for acquiring the first heat exchange parameters of the condensate water entering the heat exchanger in the coal-fired unit during the high electricity price period in the non-heating season, where the first heat exchange parameters include the flow rate and water temperature of the condensate water; A second heat exchange parameter acquisition module for acquiring the second heat exchange parameters of the circulating water in the hot water storage tank entering the heat exchanger during the high electricity price period in the non-heating season according to the outlet water temperature of the electric boiler during the low electricity price period in the non-heating season, where the second heat exchange parameters include the water temperature of the circulating water; A heat exchanger capacity determination module for calculating the capacity of the heat exchanger according to the acquired first heat exchange parameters and second heat exchange parameters; A hot water storage tank capacity determination module for obtaining the duration of the high electricity price period in the non-heating season, and calculating the capacity of the hot water storage tank according to the duration of the high electricity price period and the capacity of the heat exchanger.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, it implements the steps of any one of claims 1-8 for the capacity determination method applied to combined peak shaving based on an electric boiler.

Images