CN-122015169-A - High-capacity heat supply method and device for thermal power plant based on hot water energy storage and off-peak electricity utilization

Abstract

The invention discloses a high-capacity heat supply method and a device for a thermal power plant based on hot water energy storage and off-peak electricity utilization, wherein the method comprises the following steps of S1, performing time-power matrix division on off-peak electricity energy storage window data to obtain a heat storage period unit; the method comprises the steps of S2, carrying out electrothermal conversion efficiency calculation on the heat storage period unit to obtain period thermal power data, S3, setting heat storage system parameters, S4, generating medium temperature field distribution data, S5, generating a heat storage process thermodynamic characteristic curve, and S6, carrying out pressure bearing performance check on a heat storage device according to the thermodynamic characteristic curve. According to the invention, the time-power matrix division is carried out on the low-valley electricity energy storage window data, the continuous energy storage window is decomposed into the heat storage time period units, the low-valley electricity of the power grid can be fully utilized for energy storage, the utilization rate of electric power resources is improved, the pressure-bearing performance is checked, and the structural safety of the heat storage device is ensured.

Inventors

• CAI LIANGYU
• He Fanye
• Cai Guihui
• Request for anonymity

Assignees

• 盐城兆亿能源科技有限公司

Dates

Publication Date

20260512

Application Date

20260128

Claims (9)

1. 1. A high-capacity heat supply method of a thermal power plant based on hot water energy storage and off-peak electricity utilization is characterized by comprising the following steps: The method comprises the following steps of S1, dividing the data of the low-valley electricity energy storage window into a time-power matrix to obtain a heat storage time period unit, wherein the time-power matrix is a data structure for carrying out two-dimensional discretization representation on the low-valley electricity energy storage window according to time and expected input electric power; the heat storage period unit is a minimum simulation time segment with a determined starting and ending moment and constant or variable electric power input characteristics in a time-power matrix; s2, performing electrothermal conversion efficiency calculation on the heat storage period unit to obtain period thermal power data; S3, setting parameters of a heat storage system; S4, performing thermodynamic state simulation on the heat storage medium by using the time period thermal power data to generate medium temperature field distribution data; S5, carrying out dynamic heat loss analysis on the temperature field distribution data through the heat storage system parameters to generate a heat storage process thermodynamic characteristic curve; and S6, checking the pressure bearing performance of the heat storage device according to the thermodynamic characteristic curve.
2. 2. The high-capacity heat supply method for the thermal power plant based on hot water energy storage and off-peak electricity utilization according to claim 1, wherein in the step S1, the time-power matrix division of the off-peak electricity energy storage window data is performed in a specific manner that continuous off-peak electricity energy storage windows are discretized into a plurality of time period units with definite heat input characteristics according to time step and power level, and uniform division is performed by adopting fixed time step.
3. 3. The high-capacity heat supply method of a thermal power plant based on hot water energy storage and off-peak electricity utilization according to claim 1, wherein in step S2, the electric heat conversion efficiency is the proportion of the electric heating device converting input electric energy into effective heat energy in a set heat storage period unit; the time period thermal power data is an effective thermal input power sequence corrected by electrothermal conversion efficiency in each heat storage time period unit; and calculating time period thermal power data, namely calling an efficiency curve of the electric boiler under different load rates for each heat storage time period unit, and calculating to obtain effective thermal output power of each time period after the correction of the electrothermal conversion efficiency to form a time period thermal power data sequence.
4. 4. The method for large capacity heat supply of thermal power plant based on hot water energy storage and off-peak electricity utilization as defined in claim 1, wherein in step S3, the heat storage system parameters are engineering design parameter sets describing geometry, materials and operation boundaries of the heat storage device.
5. 5. The high-capacity heat supply method for a thermal power plant based on hot water energy storage and off-peak electricity utilization as claimed in claim 1, wherein in step S4, The heat storage medium is hot water and is provided by a circulating water system of a heat supply system of the thermal power plant; The medium temperature field distribution data are temperature distribution data sets of the heat storage medium in space and time dimensions in the heat storage process.
6. 6. The high-capacity heat supply method for the thermal power plant based on hot water energy storage and off-peak electricity utilization according to claim 1 is characterized in that in the step S5, the dynamic heat loss analysis is carried out on the temperature field distribution data through the heat storage system parameters in a specific mode that the temperature field is coupled with a tank wall structure and the ambient temperature, the heat loss in unit time is calculated and integrated to obtain an effective heat storage amount attenuation curve, and the overall heat loss is rapidly estimated based on a lumped parameter method.
7. 7. The high-capacity heat supply method of a thermal power plant based on hot water energy storage and off-peak electricity utilization according to claim 1, wherein in step S6, the pressure-bearing performance check is based on the highest temperature and pressure in a thermal characteristic curve of a heat storage process, and whether the structural strength of the storage tank meets the safety specification is verified.
8. 8. An apparatus for utilizing the heating method according to any one of claims 1 to 7, comprising: The system comprises a data dividing unit, a heat storage period unit and a power control unit, wherein the data dividing unit is used for dividing a time-power matrix of the low-valley electric energy storage window data to obtain a heat storage period unit, the time-power matrix is a data structure for carrying out two-dimensional discretization representation on the low-valley electric energy storage window according to time and expected input electric power, and the heat storage period unit is a minimum simulation time segment with a determined starting and stopping moment and constant or variable electric power input characteristics in the time-power matrix; The system comprises a data dividing unit, an efficiency calculating unit, an electric heating device and a heat storage time period unit, wherein the data dividing unit is connected with the data dividing unit and is used for carrying out electric heating conversion efficiency calculation on the heat storage time period unit to obtain time period heat power data, the electric heating conversion efficiency is the proportion of the electric heating device to the effective heat energy in the set heat storage time period unit, and the time period heat power data is an effective heat input power sequence corrected by the electric heating conversion efficiency in each heat storage time period unit; A parameter setting unit for setting and storing heat storage system parameters; the thermodynamic simulation unit is respectively connected with the efficiency calculation unit and the parameter setting unit and is used for carrying out thermodynamic state simulation on the heat storage medium by utilizing the time period thermal power data and the heat storage system parameters to generate medium temperature field distribution data; the heat loss analysis unit is respectively connected with the parameter setting unit and the thermodynamic simulation unit and is used for carrying out dynamic heat loss analysis on the temperature field distribution data through the heat storage system parameters to generate a heat storage process thermodynamic characteristic curve; and the pressure-bearing checking unit is connected with the heat loss analysis unit and used for checking the pressure-bearing performance of the heat storage device according to the thermodynamic characteristic curve.
9. 9. The high-capacity heat supply device of the thermal power plant based on hot water energy storage and off-peak electricity utilization of claim 8 is characterized in that the pressure-bearing performance checking mode of the pressure-bearing checking unit is that whether the structural strength of the storage tank meets the safety specification is verified based on the highest temperature and the pressure in the thermal characteristic curve of the heat storage process.

Description

High-capacity heat supply method and device for thermal power plant based on hot water energy storage and off-peak electricity utilization Technical Field The invention relates to the technical field of heat supply of thermal power plants, in particular to a high-capacity heat supply method and device of a thermal power plant based on hot water energy storage and off-peak electricity utilization. Background In the current energy structure, a thermal power plant serves as an important energy supply unit and takes on the dual tasks of power generation and heat supply. However, the grid load has peak-valley difference, and the power supply is relatively excessive in the valley period, so that the power resources are not fully utilized, and meanwhile, the energy waste is also caused. In the existing heat supply system of the thermal power plant, an effective energy storage means is lacked to consume off-peak electricity, and in the heat storage process, the thermodynamic characteristics of a heat storage medium are difficult to accurately master, so that the heat storage efficiency is low, the heat loss is large, and meanwhile, the structural safety of the heat storage device is also difficult to reliably guarantee. The traditional heat storage mode often adopts a simple energy storage mode, and cannot realize the refined modeling and dynamic simulation of the heat storage process, so that the design and operation of a heat storage system lack scientific and accurate data support, and further the stability and economy of large-capacity heat supply of a thermal power plant are affected. Disclosure of Invention The invention aims to solve the technical problem of providing a high-capacity heat supply method and device for a thermal power plant based on hot water energy storage and off-peak electricity utilization. The technical scheme adopted for solving the technical problems is that the high-capacity heat supply method of the thermal power plant based on hot water energy storage and off-peak electricity utilization comprises the following steps of: The method comprises the following steps of S1, dividing the data of the low-valley electricity energy storage window into a time-power matrix to obtain a heat storage time period unit, wherein the time-power matrix is a data structure for carrying out two-dimensional discretization representation on the low-valley electricity energy storage window according to time and expected input electric power; the heat storage period unit is a minimum simulation time segment with a determined starting and ending moment and constant or variable electric power input characteristics in a time-power matrix; s2, performing electrothermal conversion efficiency calculation on the heat storage period unit to obtain period thermal power data; S3, setting parameters of a heat storage system; S4, performing thermodynamic state simulation on the heat storage medium by using the time period thermal power data to generate medium temperature field distribution data; S5, carrying out dynamic heat loss analysis on the temperature field distribution data through the heat storage system parameters to generate a heat storage process thermodynamic characteristic curve; and S6, checking the pressure bearing performance of the heat storage device according to the thermodynamic characteristic curve. Preferably, in the step S1, the specific mode of performing time-power matrix division on the off-peak electricity energy storage window data is that the continuous off-peak electricity energy storage window is discretized into a plurality of time period units with definite heat input characteristics according to time step and power level, and uniform division is performed by adopting fixed time step. Preferably, in step S2, the electrothermal conversion efficiency is a proportion of the input electric energy converted into the effective heat energy by the electric heating device in the set heat storage period unit; the time period thermal power data is an effective thermal input power sequence corrected by electrothermal conversion efficiency in each heat storage time period unit; and calculating time period thermal power data, namely calling an efficiency curve of the electric boiler under different load rates for each heat storage time period unit, and calculating to obtain effective thermal output power of each time period after the correction of the electrothermal conversion efficiency to form a time period thermal power data sequence. Preferably, in step S3, the heat storage system parameter is an engineering parameter set describing geometry, materials and operation boundaries of the heat storage device. Preferably, in step S4, The heat storage medium is hot water and is provided by a circulating water system of a heat supply system of the thermal power plant; The medium temperature field distribution data are temperature distribution data sets of the heat storage medium in space and time dimension