Multi-steam source molten salt energy storage method and system based on deep peak shaving

Abstract

The application relates to a multi-steam-source molten salt energy storage method and system based on deep peak regulation, relates to the technical field of molten salt energy storage, and comprises a heat demand acquisition stage; demand storage heat is determined according to the heat demand stage and a preset heat storage relationship; a preset steam extraction module is controlled to extract preset steam from a preset thermal system module according to the demand storage heat, and the steam is introduced into a preset regional heat exchange pipeline; actual heat exchange regions of a preset heat exchange energy storage device and molten salt temperature data of the actual heat exchange regions are acquired; the actual heat exchange regions and the molten salt temperature data are analyzed to determine heat exchange demand regions; and the heat exchange energy storage device is controlled to perform heat exchange between steam of the heat exchange demand regions and preset cold molten salt to complete heat storage. The application has the effect of improving the heat exchange efficiency of steam and cold molten salt.

Description

Technical Field

[0001] This application relates to the technical field of molten salt energy storage, and in particular to a multi-steam-source molten salt energy storage method and system based on deep peak shaving. Background Technology

[0002] Solar and wind power, as clean energy resources, are characterized by intermittency, periodicity, and volatility. As their proportion in the power supply structure increases, the inertia of thermal power generation systems decreases, affecting the grid's anti-interference and regulation capabilities, and consequently increasing grid volatility. Therefore, the importance of grid peak shaving becomes more pronounced. Thermal power generation naturally possesses a 40%–100% load regulation capability. By using energy storage technology to store energy during off-peak hours and release it during peak hours, the flexibility of thermal power units in peak shaving can be improved, achieving balanced and stable operation of the power system.

[0003] In related technologies, during periods of grid downtime or when there is an oversupply of renewable energy, a portion of steam is extracted from the thermal power unit's thermal system as an energy source to heat molten salt. The low-temperature molten salt is then pumped to a molten salt heat exchanger, where it exchanges heat with the steam to generate high-temperature molten salt. The high-temperature molten salt is then stored to complete molten salt energy storage.

[0004] Regarding the aforementioned technologies, in molten salt heat exchangers, steam and low-temperature molten salt achieve heat transfer between the two media through physically isolated pipes. However, the temperature of the low-temperature molten salt closer to the steam preferentially increases. After heat conduction within the low-temperature molten salt, the overall temperature of the low-temperature molten salt rises to that of high-temperature molten salt, resulting in low heat exchange efficiency and room for improvement. Summary of the Invention

[0005] To improve the heat exchange efficiency between steam and cold molten salt, this application provides a multi-steam-source molten salt energy storage method and system based on deep peak shaving.

[0006] Firstly, this application provides a multi-steam-source molten salt energy storage method based on deep peak shaving, employing the following technical solution:

[0007] Multi-source molten salt energy storage methods based on deep peak shaving include:

[0008] The stage of obtaining calorie requirements;

[0009] The required stored heat is determined based on the heat demand stage and the pre-set heat storage relationship;

[0010] According to the demand, the preset steam extraction module extracts preset steam from the preset thermal system module and introduces the steam into the preset area heat exchange pipeline.

[0011] Obtain the actual heat exchange area and molten salt temperature data of the preset heat exchange and energy storage device;

[0012] Analyze the actual heat exchange area and molten salt temperature data to determine the heat exchange requirement area;

[0013] The heat exchange and energy storage device controls the steam in the heat exchange demand area to exchange heat with a preset cold molten salt to complete the heat storage.

[0014] By adopting the above technical solution, the steam extraction module extracts steam from the thermal system module according to the required heat storage and introduces the steam into the regional heat exchange pipeline. The actual heat exchange area and molten salt temperature data are analyzed to determine the heat exchange demand area. The heat exchange storage device is controlled to exchange heat between the steam and cold molten salt in the heat exchange demand area to complete the heat storage, thereby improving the heat exchange efficiency between steam and cold molten salt.

[0015] Optionally, the steps of analyzing the actual heat exchange area and molten salt temperature data to determine the heat exchange requirement area include:

[0016] The molten salt temperature data is analyzed to determine whether there is a pre-set uneven heat transfer condition;

[0017] If it exists, the actual heat exchange area will be determined as the heat exchange demand area;

[0018] If not, the regional molten salt temperature is determined based on the molten salt temperature data;

[0019] Determine whether the temperature of the molten salt in the area is lower than the preset molten salt storage temperature;

[0020] If it is not less than, then the actual heat exchange area is determined as the heat exchange completed area;

[0021] If it is less than the required value, then the actual heat exchange area will be determined as the heat exchange demand area.

[0022] By adopting the above technical solution, the actual heat exchange area and molten salt temperature data are analyzed. The actual heat exchange area with uneven heat exchange and the actual heat exchange area with molten salt temperature lower than the molten salt storage temperature are identified as the heat exchange demand area. Therefore, heat exchange is carried out between steam and cold molten salt in the heat exchange demand area, thereby improving the heat exchange efficiency between steam and cold molten salt.

[0023] Optionally, the steps of controlling the heat exchange storage device to exchange heat between the steam in the heat exchange demand area and the preset cold molten salt to complete the heat storage include:

[0024] Analyze the molten salt temperature data and molten salt storage temperature in the heat exchange demand area to determine the type of heat exchange area;

[0025] Determine whether the heat exchange zone type is consistent with the preset first requirement type;

[0026] If they match, the heat exchange storage device is controlled to drive the regional heat exchange pipeline to move in the heat exchange demand area to exchange heat between steam and cold molten salt.

[0027] If they are inconsistent, the heat exchange storage device will be controlled to exchange heat between steam and cold molten salt according to the type of heat exchange zone.

[0028] By adopting the above technical solution, the molten salt temperature data and molten salt storage temperature of the heat exchange demand area are analyzed to determine the heat exchange area type of the heat exchange demand area. If the heat exchange area type is consistent with the first demand type, the heat exchange energy storage device is controlled to drive the area heat exchange pipeline to exchange heat between steam and cold molten salt. If the heat exchange area type is inconsistent with the first demand type, the heat exchange area type needs to be further confirmed. The heat exchange energy storage device is controlled to exchange heat between steam and cold molten salt according to the heat exchange area type, thereby improving the heat exchange effect of steam and cold molten salt.

[0029] Optionally, the steps for controlling the heat exchange storage device to exchange heat with steam and cold molten salt according to the type of heat exchange zone include:

[0030] Determine whether the heat exchange zone type is consistent with the preset second requirement type;

[0031] If they match, the steam extraction module is controlled to extract the preset second working steam from the thermal system module and introduce it into the regional heat exchange pipeline, and the heat exchange storage device is controlled to exchange heat between the second working steam and the cold molten salt in the heat exchange demand area.

[0032] If they are inconsistent, obtain the pipeline status data;

[0033] Analyze the pipeline status data to determine whether there are any pre-defined available idle pipelines;

[0034] If not, the heat exchange storage device continues to exchange heat with steam and cold molten salt.

[0035] If it exists, analyze the heat exchange demand area and the preset available area range to determine the actual idle pipes;

[0036] The control heat exchange storage device drives the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt.

[0037] By adopting the above technical solution, when the heat exchange area type is determined to be inconsistent with the first demand type, the heat exchange area type is further confirmed. If the heat exchange area type is consistent with the second demand type, the heat exchange energy storage device is controlled to exchange heat with the second working steam and cold molten salt in the heat exchange demand area. If the heat exchange area type is inconsistent with the second demand type, the heat exchange area and available area range are analyzed to determine the actual idle pipes. The heat exchange energy storage device is controlled to drive the actual idle pipes and area heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt, thereby improving the effectiveness of the heat exchange energy storage device in exchanging heat with steam and cold molten salt.

[0038] Optionally, the steps of analyzing the heat exchange demand area and the preset available area range to determine the actual available pipes include:

[0039] Analyze the heat exchange demand area and the available area range to determine the directly adjacent areas;

[0040] Get the status of direct pipes in directly adjacent regions;

[0041] The status of direct piping is analyzed to determine whether there are any pre-set idle heat exchange pipes.

[0042] If it exists, then the idle heat exchange pipe is determined as the actual idle pipe;

[0043] If not, analyze the directly adjacent areas and the available area range to determine the indirectly adjacent areas;

[0044] Obtain the status of indirect pipes in indirectly adjacent regions;

[0045] Analyze the status of indirect pipelines to identify idle indirect pipelines;

[0046] Based on the heat exchange demand area, the direct heat exchange pipelines corresponding to the indirect idle pipelines are obtained, and the direct heat exchange pipelines are determined as the actual idle pipelines.

[0047] By adopting the above technical solution, when it is determined that there are available idle pipes, if there are idle heat exchange pipes in the directly adjacent area, the idle heat exchange pipes are identified as actual idle pipes. If there are no idle heat exchange pipes in the directly adjacent area, the status of indirect pipes is analyzed to identify indirect idle pipes. Based on the heat exchange area, the direct heat exchange pipes corresponding to the indirect idle pipes are obtained, and the direct heat exchange pipes are identified as actual idle pipes, thereby improving the accuracy of the determination of actual idle pipes.

[0048] Optionally, the steps of controlling the heat storage device to drive the actual idle pipes and zone heat exchange pipes to move within the heat exchange demand area for heat exchange with steam and cold molten salt include:

[0049] Obtain the initial dwell position of the actual idle pipe and the movable position of the heat exchange demand area;

[0050] Analyze the initial stopping position and the movable position to determine the actual stopping position;

[0051] The heat exchange and energy storage device is controlled to move the actual idle pipe from its initial dwell position to its actual dwell position.

[0052] Obtain the actual temperature layer of the molten salt;

[0053] The actual temperature layer of molten salt and the preset required pipe spacing are analyzed to determine the pipe location distribution in the heat exchange demand area;

[0054] The control heat exchange and energy storage device drives the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area according to the pipe location distribution, so as to exchange heat with steam and cold molten salt.

[0055] By adopting the above technical solution, the initial dwell position and movable position are analyzed to determine the actual dwell position of the actual idle pipe, and the heat exchange storage device is controlled to drive the actual idle pipe to the actual dwell position. The actual temperature layer of molten salt and the pipe spacing requirements are analyzed to determine the pipe location distribution in the heat exchange demand area. Based on the pipe location distribution, the heat exchange storage device is controlled to drive the actual idle pipe and the regional heat exchange pipe to move in the heat exchange demand area. At the same time, the actual idle pipe and the regional heat exchange pipe are used for steam and cold molten salt heat exchange, thereby improving the heat exchange efficiency.

[0056] Optionally, the step of controlling the heat exchange storage device to drive the zone heat exchange pipes to move within the heat exchange demand area for heat exchange between steam and cold molten salt includes:

[0057] Obtain temperature distribution data for the heat exchange demand area;

[0058] Analyze the temperature distribution data and molten salt storage temperature to determine the actual heat exchange location;

[0059] The control heat exchange storage device drives the regional heat exchange pipeline to the actual heat exchange location to exchange heat between steam and cold molten salt.

[0060] By adopting the above technical solution, the temperature distribution data and molten salt storage temperature are analyzed to determine the actual heat exchange location. The heat exchange storage device is controlled to drive the regional heat exchange pipeline to move to the actual heat exchange location to exchange heat between steam and cold molten salt, thereby improving the uniformity of heat exchange with cold molten salt.

[0061] Secondly, this application provides a multi-steam-source molten salt energy storage system based on deep peak shaving, adopting the following technical solution:

[0062] A multi-steam-source molten salt energy storage system based on deep peak shaving includes:

[0063] The acquisition module is used to acquire data on heat demand stage, actual heat exchange area, and molten salt temperature;

[0064] A memory for storing programs of the multi-steam-source molten salt energy storage method based on deep peak shaving as described in any of the above.

[0065] The processor and the program in the memory can be loaded and executed by the processor to implement the multi-steam-source molten salt energy storage method based on deep peak shaving as described in any of the above.

[0066] By adopting the above technical solution, the processor loads and executes the program of the multi-steam-source molten salt energy storage method based on deep peak shaving stored in the memory. The control acquisition module acquires a series of data related to multi-steam-source molten salt energy storage, and then controls the steam extraction module to extract steam from the thermal system module according to the required heat storage, and introduces the steam into the regional heat exchange pipeline. The actual heat exchange area and molten salt temperature data are analyzed to determine the heat exchange demand area. The heat exchange energy storage device is controlled to exchange heat between the steam and cold molten salt in the heat exchange demand area to complete the heat storage, thereby improving the heat exchange efficiency between steam and cold molten salt.

[0067] In summary, this application includes at least one of the following beneficial technical effects:

[0068] 1. By controlling the steam extraction module to extract steam from the thermal system module according to the heat storage demand, and introducing the steam into the regional heat exchange pipeline, the actual heat exchange area and molten salt temperature data are analyzed to determine the heat exchange demand area. The heat exchange energy storage device is controlled to exchange heat between the steam and cold molten salt in the heat exchange demand area to complete the heat storage, thereby improving the heat exchange efficiency between steam and cold molten salt.

[0069] 2. When the heat exchange area type is inconsistent with the first demand type, the heat exchange area type is further confirmed. If the heat exchange area type is consistent with the second demand type, the heat exchange energy storage device is controlled to exchange heat with the second working steam and molten salt in the heat exchange demand area. If the heat exchange area type is inconsistent with the second demand type, the heat exchange area and available area range are analyzed to determine the actual idle pipes. The heat exchange energy storage device is controlled to drive the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and molten salt, thereby improving the effectiveness of the heat exchange energy storage device in exchanging heat with steam and molten salt.

[0070] 3. By analyzing temperature distribution data and molten salt storage temperature, the actual heat exchange location is determined. The heat exchange storage device is controlled to drive the regional heat exchange pipeline to the actual heat exchange location to exchange heat between steam and cold molten salt, thereby improving the uniformity of heat exchange with cold molten salt. Attached Figure Description

[0071] Figure 1This is a flowchart of the multi-steam-source molten salt energy storage method based on deep peak shaving in the embodiments of this application.

[0072] Figure 2 This is a flowchart illustrating the analysis of actual heat exchange area and molten salt temperature data in this application embodiment to determine the heat exchange requirement area.

[0073] Figure 3 This is a flowchart in the embodiments of this application showing how the heat exchange and energy storage device exchanges heat between the steam in the heat exchange demand area and a preset cold molten salt to complete the heat storage.

[0074] Figure 4 This is a flowchart illustrating the control of heat exchange storage device for steam and cold molten salt heat exchange according to the type of heat exchange area in this application embodiment.

[0075] Figure 5 This is a flowchart in this application embodiment that analyzes the heat exchange demand area and the preset available area range to determine the actual idle pipes.

[0076] Figure 6 This is a flowchart in the embodiments of this application showing how the heat exchange and energy storage device drives the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt.

[0077] Figure 7 This is a flowchart in the embodiments of this application showing how the heat exchange storage device drives the regional heat exchange pipeline to move in the heat exchange demand area to exchange heat between steam and cold molten salt. Detailed Implementation

[0078] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 7 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0079] Reference Figure 1 This application discloses a multi-steam-source molten salt energy storage method based on deep peak shaving, including the following steps:

[0080] Step S100: Obtaining heat requirements.

[0081] Among them, the heat demand stage refers to the unit operation stage of thermal power generating units, including the non-heating season heat storage peak shaving stage, the non-heating season heat release peak stage, the heating season heat storage peak shaving stage, and the heating season heat release peak stage, which is obtained by the processing terminal identifying and calling the power grid dispatching instructions of the power grid dispatching center.

[0082] Step S101: Determine the required stored heat based on the heat demand stage and the preset heat storage relationship.

[0083] Among them, the heat storage relationship refers to the quantitative relationship between the heat demand to be stored and the unit operation stage. It is obtained by the staff inputting the data into the processing terminal. For example, during the peak heat storage and shaving stage in the non-heating season, 40% of the boiler's rated load heat is stored, while during the peak heat release stage in the non-heating season, 0% of the boiler's rated load heat is stored, i.e., no heat storage is performed. The heat demand to be stored refers to the heat that the thermal power generating unit needs to store, which is obtained by the processing terminal by looking up the corresponding heat storage relationship according to the heat demand stage.

[0084] Step S102: Based on the required heat storage, the preset steam extraction module extracts preset steam from the preset thermal system module and introduces the steam into the preset area heat exchange pipeline.

[0085] The steam extraction module refers to the device for extracting steam, including an extraction pump, control valve, sensor, flow meter, and pipeline. The extraction pump is used to extract steam from the thermal system module, the control valve is used to control and regulate the steam flow rate, the sensor is used to detect the temperature and pressure parameters of the steam, the flow meter is used to measure the amount of steam extracted, and the pipeline is used to connect the various components to ensure the smooth flow of steam.

[0086] A thermal system module refers to a device that generates steam, including a coal-fired boiler, steam turbine, generator, condenser, condensate pump, heater, deaerator, feedwater pump, and high-pressure heater. Steam includes main steam and high-temperature reheat steam. Main steam is generated by burning fuel in the boiler to feedwater. This main steam then enters the high-pressure cylinder of the steam turbine to perform work. After completing its work, the high-pressure cylinder produces low-temperature reheat steam with lower temperature and pressure, which is then discharged from the high-pressure cylinder. This low-temperature reheat steam returns to the boiler and is reheated to become high-temperature reheat steam. Zone heat exchange pipes refer to pipes that transport steam and exchange heat with cold molten salt.

[0087] The processing terminal determines the steam flow rate based on the required heat storage, and controls the steam extraction module to extract steam from the thermal system according to the steam flow rate, then introduces the extracted steam into the zone heat exchange pipeline. In this embodiment, the required heat storage is 600 MWh, the steam parameters are 540℃ / 10 MPa, the steam outlet specific enthalpy is 3450 KJ / Kg, the feedwater temperature is 220℃, the feedwater inlet specific enthalpy is 950 KJ / Kg, the heat storage efficiency is 0.92, and the steam flow rate is calculated using the following formula:

[0088] ,

[0089] In the formula, Indicates steam flow rate. This indicates the need to store heat. Indicates thermal storage efficiency. This indicates the specific enthalpy of the steam outlet. Indicates the specific enthalpy at the feedwater inlet, then the steam flow rate.

[0090] .

[0091] Step S103: Obtain the actual heat exchange area and molten salt temperature data of the preset heat exchange energy storage device.

[0092] Among them, the heat exchange energy storage device refers to the heat exchange control device between steam and cold molten salt, including a steam pipeline network, a linear module, a corrugated expansion joint, and a support system. The linear module is used to control the movement of the corresponding steam pipeline in the steam pipeline network, which refers to a pipeline network formed by multiple steam pipelines. The corrugated expansion joint uses the flexibility of the metal corrugated pipe to absorb the axial, lateral, and angular displacements and their combinations caused by thermal expansion and contraction of the steam pipeline, thereby allowing the steam pipeline to move within a set range. The support system is used to support the weight of the steam pipeline and allows the steam pipeline to move axially on the support surface.

[0093] The actual heat exchange area refers to the region where steam exchanges heat with the cold molten salt. The processing terminal divides the cold molten salt storage area into multiple independent rectangular heat exchange working areas based on the distribution of the steam pipeline network. Molten salt temperature data refers to the molten salt temperature data within the actual heat exchange area, obtained through measurements using a distributed fiber optic temperature measurement system installed within the actual heat exchange area.

[0094] Step S104: Analyze the actual heat exchange area and molten salt temperature data to determine the heat exchange requirement area.

[0095] The heat exchange requirement area refers to the area where continued heat exchange between steam and cold molten salt is needed. This area is determined by the processing terminal based on the actual heat exchange area and molten salt temperature data. The specific determination method is detailed in [reference needed]. Figure 2 The steps.

[0096] Step S105: Control the heat exchange and energy storage device to exchange heat between the steam in the heat exchange demand area and the preset cold molten salt to complete the heat storage.

[0097] Among them, molten salt refers to a thermal energy storage medium made by mixing a variety of inorganic salts in a specific ratio. The molten salt is stored in molten salt storage equipment by the staff.

[0098] The processing terminal controls the heat exchange storage device to exchange heat between steam and cold molten salt in the heat exchange demand area according to the heat exchange demand area. For specific details, please refer to [link / reference]. Figure 3 The steps.

[0099] Reference Figure 2 The steps to determine the heat exchange requirement area by analyzing the actual heat exchange area and molten salt temperature data include:

[0100] Step S200: Analyze the molten salt temperature data to determine whether there is a preset uneven heat transfer state.

[0101] The term "uneven heat transfer" refers to an uneven temperature distribution of the cold molten salt in the actual heat transfer area, i.e., temperature stratification of the cold molten salt. The processing terminal determines whether temperature stratification exists in the molten salt temperature data corresponding to the actual heat transfer area, thereby confirming the existence of an uneven heat transfer state. Specifically, the processing terminal analyzes the molten salt temperature data; when different temperatures exist in the actual heat transfer area, the terminal stratifies the temperature and calculates the temperature difference between the different strata. If the temperature difference between the strata is greater than 3℃, an uneven heat transfer state is confirmed; if the temperature difference is less than or equal to 3℃, an uneven heat transfer state is confirmed.

[0102] Step S201: If it exists, then the actual heat exchange area is determined as the heat exchange demand area.

[0103] If the processing terminal determines that there is temperature stratification in the molten salt temperature data, it indicates that there is uneven heat exchange in the actual heat exchange area. Therefore, the actual heat exchange area is determined as the heat exchange demand area.

[0104] The definition of the heat exchange demand area in this step is the same as that in step S104. The heat exchange demand area in this step is the heat exchange demand area where there is uneven heat exchange.

[0105] Step S202: If it does not exist, determine the regional molten salt temperature based on the molten salt temperature data.

[0106] If the processing terminal determines that there is no temperature stratification in the molten salt temperature data, it indicates that there is no uneven heat exchange in the actual heat exchange area. In this case, it is necessary to determine the regional molten salt temperature based on the molten salt temperature data to provide data support for the subsequent determination of the heat exchange demand area.

[0107] The zone molten salt temperature refers to the temperature of the cold molten salt in the actual heat exchange zone, which is obtained by measuring a distributed fiber optic temperature measurement system installed in the actual heat exchange zone.

[0108] Step S2021: Determine whether the temperature of the molten salt in the area is lower than the preset molten salt storage temperature.

[0109] The molten salt storage temperature refers to the maximum heat exchange temperature of the cold molten salt, which is obtained by the staff through input into the processing terminal.

[0110] By processing the terminal to determine whether the molten salt temperature in the judgment area is lower than the molten salt storage temperature, it can be determined whether the actual heat exchange area should be identified as the heat exchange demand area.

[0111] Step S20211: If it is not less than, then the actual heat exchange area is determined as the heat exchange completed area.

[0112] If the temperature of the molten salt in the area determined by the processing terminal is not less than the temperature of the molten salt storage, it indicates that the temperature of the cold molten salt in the actual heat exchange area has reached the maximum heat exchange temperature, that is, the cold molten salt in the actual heat exchange area has completed heat exchange. At this time, the actual heat exchange area is determined as the heat exchange completed area.

[0113] The heat exchange completed area refers to the area where the heat exchange between steam and cold molten salt has been completed.

[0114] Step S20212: If it is less than, then the actual heat exchange area is determined as the heat exchange demand area.

[0115] If the temperature of the molten salt in the processing terminal area is lower than the temperature of the molten salt storage area, it indicates that the temperature of the cold molten salt in the actual heat exchange area has not yet reached the maximum heat exchange temperature. At this time, the actual heat exchange area still needs to continue to exchange heat between steam and cold molten salt. Therefore, the actual heat exchange area is determined as the heat exchange demand area.

[0116] The definition of the heat exchange demand area in this step is the same as that in step S104. The heat exchange demand area in this step is the heat exchange demand area where heat exchange has not been completed.

[0117] Reference Figure 3 The steps for controlling the heat exchange and energy storage device to exchange heat between the steam in the heat exchange demand area and the preset cold molten salt to complete the heat storage include:

[0118] Step S300: Analyze the molten salt temperature data and molten salt storage temperature of the heat exchange demand area to determine the type of heat exchange area.

[0119] Among them, the heat exchange zone type refers to the specific type of heat exchange demand zone. The heat exchange zone types include the first demand type, the second demand type, and the third demand type. The first demand type refers to the heat exchange demand zone where there is uneven heat exchange. The second demand type refers to the heat exchange demand zone where the heat exchange is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is less than 10℃. The third demand type refers to the heat exchange demand zone where the heat exchange is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is not less than 10℃.

[0120] The processing terminal first analyzes the molten salt temperature data. If the processing terminal determines that there is temperature stratification in the molten salt temperature data, the heat exchange area type is determined as the first demand type. If the processing terminal determines that there is no temperature stratification in the molten salt temperature data, the processing terminal subtracts the molten salt temperature data from the molten salt storage temperature to obtain the molten salt temperature difference. If the processing terminal determines that the molten salt temperature difference is less than 10℃, the heat exchange area type is determined as the second demand type. If the processing terminal determines that the molten salt temperature difference is not less than 10℃, the heat exchange area type is determined as the third demand type.

[0121] Step S301: Determine whether the heat exchange zone type is consistent with the preset first requirement type.

[0122] The first type of demand refers to the heat exchange demand area where there is uneven heat exchange.

[0123] The processing terminal determines whether the heat exchange area type of the heat exchange demand area is consistent with the first demand type, that is, whether there is an uneven heat exchange state in the heat exchange demand area, thereby determining the heat exchange mode between steam and hot and cold salt.

[0124] Step S3011: If consistent, control the heat exchange storage device to drive the regional heat exchange pipeline to move in the heat exchange demand area to exchange heat between steam and cold molten salt.

[0125] If the processing terminal determines that the heat exchange area type is consistent with the first demand type, meaning that there is uneven heat exchange in the heat exchange demand area, then the heat exchange storage device is controlled to drive the regional heat exchange pipeline to move within the heat exchange demand area to exchange heat between steam and molten salt. The specific method is as follows: Figure 7 The steps.

[0126] Step S3012: If they are inconsistent, control the heat exchange storage device to exchange heat between steam and cold molten salt according to the heat exchange zone type.

[0127] If the processing terminal determines that the heat exchange zone type is inconsistent with the first demand type, meaning there is no uneven heat exchange in the heat exchange demand zone, then the heat exchange zone type may be the second or third demand type. In this case, it is necessary to control the heat exchange storage device to exchange heat between steam and molten salt according to the heat exchange zone type. The specific method is described in [reference needed]. Figure 4 The steps.

[0128] Reference Figure 4 The steps for controlling the heat exchange storage device to exchange heat with steam and cold molten salt according to the type of heat exchange zone include:

[0129] Step S400: Determine whether the heat exchange zone type is consistent with the preset second requirement type.

[0130] The second type of demand refers to the heat exchange demand area where the heat exchange is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is less than 10℃.

[0131] The processing terminal determines whether the heat exchange area type of the heat exchange demand area is consistent with the second demand type, that is, whether the heat exchange demand area is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is less than 10℃, thereby determining the heat exchange method between steam and hot and cold salt.

[0132] Step S401: If consistent, control the steam extraction module to extract the preset second working steam from the thermal system module and introduce it into the regional heat exchange pipeline, and control the heat exchange storage device to exchange heat between the second working steam and the cold molten salt in the heat exchange demand area.

[0133] If the processing terminal determines that the heat exchange area type is consistent with the second demand type, it indicates that the heat exchange demand area is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is less than 10℃. This indicates that the cold molten salt temperature in the heat exchange demand area is similar to the molten salt storage temperature. Therefore, the steam extraction module is controlled to extract the second working steam with a lower temperature from the thermal system module and introduce it into the area heat exchange pipeline. At the same time, the heat exchange energy storage device is controlled to exchange heat between the second working steam and the cold molten salt in the heat exchange demand area. The main steam is used for the high temperature difference stage of the cold molten salt temperature rise, and the second working steam is used for the low temperature difference stage of the cold molten salt temperature rise. By using the second working steam to exchange heat with the cold molten salt, the utilization efficiency of steam is improved, energy matching is optimized, and energy loss is reduced.

[0134] The second working steam refers to high-temperature reheat steam with lower temperature and pressure.

[0135] Step S402: If there is a discrepancy, obtain the pipeline status data.

[0136] If the processing terminal determines that the heat exchange area type is inconsistent with the second area type, it indicates that the heat exchange area type is the third area type, that is, the heat exchange is uniform but the difference between the molten salt temperature data and the molten salt storage temperature is not less than 10℃. At this time, it indicates that the cold molten salt temperature and the molten salt storage temperature in the heat exchange demand area are significantly different. At this time, the pipeline status data is obtained to provide data support for the subsequent determination of available idle pipelines.

[0137] Pipeline status data refers to the status of steam pipelines, including idle and working conditions. It is obtained by the processing terminal by identifying and calling data from the steam pipeline management system. The scope of the data call is the pipeline status data within two available areas extending outward from the heat exchange demand area.

[0138] Step S4021: Analyze the pipeline status data to determine whether there are any preset available idle pipelines.

[0139] Among them, available idle pipes refer to steam pipes that are in an idle state. The processing terminal determines whether there are any idle steam pipes in the pipe status data, thereby determining whether there are any available idle pipes.

[0140] Step S40211: If not, control the heat exchange storage device to continue exchanging heat between steam and cold molten salt.

[0141] If the processing terminal determines that there is no idle steam pipeline in the pipeline status data, it indicates that there is no available idle pipeline. At this time, the heat exchange storage device is controlled to drive the regional heat exchange pipeline corresponding to the heat exchange demand area to exchange heat with steam and cold molten salt.

[0142] Step S40212: If it exists, analyze the heat exchange demand area and the preset available area range to determine the actual idle pipes.

[0143] If the processing terminal determines that there are idle steam pipes in the pipeline status data, it indicates that there are available idle pipes. In this case, the heat exchange demand area and the available area are analyzed to determine the actual idle pipes. The specific method is described in [reference needed]. Figure 5 The steps.

[0144] The available area range refers to the area where steam pipes can be moved directly to the area requiring heat exchange; the available area range is set to 1. Actual idle pipes refer to the available idle steam pipes within the area requiring heat exchange.

[0145] Step S4022: Control the heat exchange storage device to drive the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt.

[0146] Once the actual available pipelines are determined, the heat exchange and energy storage device is controlled to move the actual available pipelines and the regional heat exchange pipelines within the heat exchange demand area to exchange heat between steam and molten salt. The specific method is described in [reference needed]. Figure 6 The steps.

[0147] Reference Figure 5 The steps for analyzing the heat exchange demand area and the preset available area range to determine the actual available pipes include:

[0148] Step S500: Analyze the heat exchange demand area and the available area range to determine the directly adjacent areas.

[0149] The directly adjacent area refers to the area where steam pipelines can be moved directly to the area requiring heat exchange. The processing terminal determines the area involved by extending outward from the area requiring heat exchange as the center and the available area as the radius.

[0150] Step S501: Obtain the status of the direct pipes in the directly adjacent regions.

[0151] The direct pipeline status refers to the status of steam pipelines in directly adjacent areas, including idle and working conditions. This status is obtained by the processing terminal by mapping and comparing the pipeline status data with the directly adjacent areas.

[0152] Step S502: Analyze the status of the direct pipes to determine whether there are any pre-defined idle heat exchange pipes.

[0153] Among them, idle heat exchange pipes refer to steam pipes that are idle in the directly adjacent area. The processing terminal determines whether there are any idle steam pipes in the direct pipe status, thereby determining whether there are any idle heat exchange pipes.

[0154] Step S5021: If it exists, then the idle heat exchange pipe is determined as the actual idle pipe.

[0155] If the processing terminal determines that there is an idle steam pipe in the directly adjacent area, it indicates that there is an idle heat exchange pipe in the directly adjacent area. Therefore, the idle heat exchange pipe is determined as the actual idle pipe. The definition of the actual idle pipe in this step is the same as the definition of the actual idle pipe in step S40212.

[0156] Step S5022: If it does not exist, analyze the directly adjacent areas and the available area range to determine the indirectly adjacent areas.

[0157] If the processing terminal determines that there is no idle steam pipe in the directly adjacent area, it indicates that there is no idle heat exchange pipe in the directly adjacent area, and it is necessary to determine the idle steam pipe in the indirectly adjacent area.

[0158] The definition of the available area range in this step is the same as that in step S40212. The indirect adjacent area refers to the area where steam pipes cannot be moved directly to the heat exchange demand area. The processing terminal determines the area that expands outward by one layer around the directly adjacent area as the indirect adjacent area.

[0159] Step S50221: Obtain the status of indirect pipes in the indirect adjacent regions.

[0160] The indirect pipeline status refers to the status of steam pipelines in indirectly adjacent areas, including idle and working conditions. This status is obtained by the processing terminal by mapping and comparing the pipeline status data with the indirectly adjacent areas.

[0161] Step S50222: Analyze the status of indirect pipelines to determine the indirect idle pipelines.

[0162] Among them, the indirect idle pipeline refers to the steam pipeline in the indirectly adjacent area that is in an idle state. The processing terminal determines the steam pipeline in the indirect pipeline state that is in an idle state as the indirect idle pipeline.

[0163] Step S50223: Based on the heat exchange demand area, obtain the direct heat exchange pipes corresponding to the indirect idle pipes, and determine the direct heat exchange pipes as the actual idle pipes.

[0164] In this step, the definition of the actual idle pipe is the same as that in step S40221. The processing terminal compares the indirect idle pipe, the indirect adjacent area, and the direct adjacent area to determine the direct adjacent area corresponding to the indirect adjacent area where the indirect idle pipe is located. Then, the direct heat exchange pipe in the direct adjacent area is determined and the direct heat exchange pipe is determined as the actual heat exchange pipe. That is, the heat exchange storage device is controlled to drive the indirect idle pipe to the direct adjacent area for heat exchange of steam and molten salt, and the heat exchange storage device is controlled to drive the direct heat exchange pipe to the heat exchange demand area for heat exchange of steam and molten salt.

[0165] Reference Figure 6 The steps of controlling the heat exchange storage device to drive the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt include:

[0166] Step S600: Obtain the initial dwell position of the actual idle pipe and the movable position of the heat exchange demand area.

[0167] The initial dwell position refers to the actual location of the idle pipe in the directly adjacent area, which is obtained by the processing terminal by calling the data of the steam pipe management system. The movable position refers to the location where the pipe can stay in the heat exchange demand area, which is obtained by the processing terminal by calling the data of the steam pipe management system to obtain the location of the heat exchange pipe in the heat exchange demand area, and the location other than the location of the heat exchange pipe in the heat exchange demand area is determined as the movable position.

[0168] Step S601: Analyze the initial stopping position and movable position to determine the actual stopping position.

[0169] The actual dwell position refers to the initial dwell position of the actual idle pipe within the heat exchange demand area. The processing terminal calculates the minimum moving distance from the initial dwell position to the movable position and determines the position corresponding to this minimum moving distance as the actual dwell position. For example, the geometric midpoint of the actual idle pipe... The initial stopping position is determined, and the movable area is a rectangular region, with the lower left corner of the rectangular region being... The upper right corner is The actual location where the person stayed was ,but , .

[0170] Step S602: Control the heat exchange and energy storage device to drive the actual idle pipe from the initial dwell position to the actual dwell position.

[0171] The processing terminal controls the linear module to start according to the actual stopping position, and pushes or pulls the actual idle pipe through the support system. The corrugated expansion joint absorbs thermal expansion and mechanical vibration during the movement, and the position of the steam pipe is fed back in real time through the displacement sensor, thereby moving the steam pipe to the actual stopping position.

[0172] Step S603: Obtain the actual temperature layer of the molten salt.

[0173] The actual molten salt temperature layer refers to the temperature data of the cold molten salt in the heat exchange demand area, which is obtained by measuring through a distributed fiber optic temperature measurement system installed in the heat exchange demand area.

[0174] Step S604: Analyze the actual temperature layer of the molten salt and the preset required pipe spacing to determine the pipe location distribution in the heat exchange demand area.

[0175] The required pipe spacing refers to the minimum safe distance between two steam pipes, obtained by the operator inputting this information into the processing terminal. Pipe location distribution refers to the distribution of actual idle pipes and regional heat exchange pipes within the heat exchange demand area. The processing terminal determines the high-efficiency heat exchange area based on the actual molten salt temperature layer, i.e., the area where the cold molten salt temperature exceeds 450℃. This high-efficiency heat exchange area is divided into grids, and the thermal weight of each grid cell is calculated. The two grids with the highest weights are selected as candidate locations. The weight calculation formula is as follows:

[0176] ,

[0177] in, This is the heat weight value. For temperature, The distance between the grid and the top of the cold molten salt storage equipment. The radius of influence of the steam pipeline.

[0178] At this point, the actual distance between candidate positions is calculated by the processing terminal. If the actual distance is greater than or equal to the required distance of the pipeline, the candidate position is taken as the actual position of the steam pipeline, thereby determining the pipeline position distribution. If the actual distance is less than the required distance of the pipeline, the actual second candidate position is determined based on the candidate position with the second weight and the required distance of the pipeline. The actual second candidate position and the candidate position with the first weight are then determined as the actual position of the steam pipeline, thereby determining the pipeline position distribution.

[0179] Step S605: Control the heat exchange and energy storage device to move the actual idle pipes and regional heat exchange pipes in the heat exchange demand area according to the pipe location distribution, so as to exchange heat with steam and cold molten salt.

[0180] The processing terminal controls the heat exchange and energy storage device to move the actual idle pipes and regional heat exchange pipes in the heat exchange demand area according to the distribution of pipe locations.

[0181] Reference Figure 7 The steps of controlling the heat exchange storage device to drive the regional heat exchange pipes to move in the heat exchange demand area to exchange heat between steam and cold molten salt include:

[0182] Step S700: Obtain temperature distribution data for the heat exchange requirement area.

[0183] Among them, the temperature distribution data refers to the temperature data of the cold molten salt in the heat exchange demand area, which is obtained by measuring through a distributed fiber optic temperature measurement system installed in the heat exchange demand area.

[0184] Step S701: Analyze the temperature distribution data and molten salt storage temperature to determine the actual heat exchange location.

[0185] The actual heat exchange location refers to the target moving position of the regional heat exchange pipeline in the heat exchange demand area. The processing terminal determines the molten salt temperature level based on the temperature distribution data, sorts and compares the molten salt temperature levels to determine the maximum temperature level. If the molten salt temperature corresponding to the maximum temperature level is less than the molten salt storage temperature, the regional heat exchange pipeline continues to exchange heat with steam and cold molten salt at the original position. If the molten salt temperature corresponding to the maximum temperature level is greater than or equal to the molten salt storage temperature, the position corresponding to the second temperature level in the molten salt temperature level is determined as the actual heat exchange location.

[0186] Step S702: Control the heat exchange storage device to drive the regional heat exchange pipeline to the actual heat exchange position for heat exchange between steam and cold molten salt.

[0187] The processing terminal controls the heat exchange storage device to drive the regional heat exchange pipeline to move in the heat exchange demand area according to the actual heat exchange location, thereby exchanging heat between steam and cold molten salt.

[0188] Based on the same inventive concept, embodiments of this application provide a multi-steam-source molten salt energy storage system based on deep peak shaving, including:

[0189] The acquisition module is used to acquire data on heat demand stage, actual heat exchange area, molten salt temperature, and pipeline status.

[0190] The memory is used to store the program for the multi-steam-source molten salt energy storage method based on deep peak shaving;

[0191] The processor and memory programs can be loaded and executed by the processor to implement a multi-steam-source molten salt energy storage method based on deep peak shaving.

[0192] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0193] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A multi-steam-source molten salt energy storage method based on deep peak shaving, characterized in that, include: The stage of obtaining calorie requirements; The required stored heat is determined based on the heat demand stage and the pre-set heat storage relationship; According to the demand, the preset steam extraction module extracts preset steam from the preset thermal system module and introduces the steam into the preset area heat exchange pipeline. Obtain the actual heat exchange area and molten salt temperature data of the preset heat exchange and energy storage device; Analyze the actual heat exchange area and molten salt temperature data to determine the heat exchange requirement area; The heat exchange and energy storage device controls the steam in the heat exchange demand area to exchange heat with the preset cold molten salt to complete the heat storage. The steps for controlling the heat exchange storage device to exchange heat between steam in the heat exchange demand area and a pre-set cold molten salt to complete heat storage include: Analyze the molten salt temperature data and molten salt storage temperature in the heat exchange demand area to determine the type of heat exchange area; Determine whether the heat exchange zone type is consistent with the preset first demand type; the first demand type refers to the heat exchange demand zone where there is uneven heat exchange. If they match, the heat exchange storage device is controlled to drive the regional heat exchange pipeline to move in the heat exchange demand area to exchange heat between steam and cold molten salt. If they are inconsistent, the heat exchange storage device shall be controlled to exchange heat between steam and cold molten salt according to the type of heat exchange zone. The steps for controlling the heat exchange storage device to exchange heat between steam and molten salt according to the type of heat exchange zone include: Determine whether the heat exchange zone type is consistent with the preset second demand type; the second demand type refers to a heat exchange demand zone where the heat exchange is uniform and the difference between the molten salt temperature data and the molten salt storage temperature is less than 10℃. If they match, the steam extraction module is controlled to extract the preset second working steam from the thermal system module and introduce it into the regional heat exchange pipeline, and the heat exchange storage device is controlled to exchange heat between the second working steam and the cold molten salt in the heat exchange demand area. If they are inconsistent, obtain the pipeline status data; Analyze the pipeline status data to determine whether there are any pre-defined available idle pipelines; If not, the heat exchange storage device continues to exchange heat with steam and cold molten salt. If it exists, analyze the heat exchange demand area and the preset available area range to determine the actual idle pipes; The control heat exchange storage device drives the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt.

2. The multi-steam-source molten salt energy storage method based on deep peak shaving according to claim 1, characterized in that, The steps to determine the heat exchange requirement area by analyzing the actual heat exchange area and molten salt temperature data include: The molten salt temperature data is analyzed to determine whether there is a pre-set uneven heat transfer condition; If it exists, the actual heat exchange area will be determined as the heat exchange demand area; If not, the regional molten salt temperature is determined based on the molten salt temperature data; Determine whether the temperature of the molten salt in the area is lower than the preset molten salt storage temperature; If it is not less than, then the actual heat exchange area is determined as the heat exchange completed area; If it is less than the required value, then the actual heat exchange area will be determined as the heat exchange demand area.

3. The multi-steam-source molten salt energy storage method based on deep peak shaving according to claim 1, characterized in that, The steps to analyze the heat exchange demand area and the pre-defined available area range to determine the actual available piping include: Analyze the heat exchange demand area and the available area range to determine the directly adjacent areas; Get the status of direct pipes in directly adjacent regions; The status of direct piping is analyzed to determine whether there are any pre-set idle heat exchange pipes. If it exists, then the idle heat exchange pipe is determined as the actual idle pipe; If not, analyze the directly adjacent areas and the available area range to determine the indirectly adjacent areas; Obtain the status of indirect pipes in indirectly adjacent regions; Analyze the status of indirect pipelines to identify idle indirect pipelines; Based on the heat exchange demand area, the direct heat exchange pipelines corresponding to the indirect idle pipelines are obtained, and the direct heat exchange pipelines are determined as the actual idle pipelines.

4. The multi-steam-source molten salt energy storage method based on deep peak shaving according to claim 1, characterized in that, The steps of controlling the heat exchange storage device to drive the actual idle pipes and zone heat exchange pipes to move in the heat exchange demand area to exchange heat with steam and cold molten salt include: Obtain the initial dwell position of the actual idle pipe and the movable position of the heat exchange demand area; Analyze the initial stopping position and the movable position to determine the actual stopping position; The heat exchange and energy storage device is controlled to move the actual idle pipe from its initial dwell position to its actual dwell position. Obtain the actual temperature layer of the molten salt; The actual temperature layer of molten salt and the preset required pipe spacing are analyzed to determine the pipe location distribution in the heat exchange demand area. The control heat exchange and energy storage device drives the actual idle pipes and regional heat exchange pipes to move in the heat exchange demand area according to the pipe location distribution, so as to exchange heat with steam and cold molten salt.

5. The multi-steam-source molten salt energy storage method based on deep peak shaving according to claim 1, characterized in that, The steps of controlling the heat exchange storage device to drive the regional heat exchange pipes to move in the heat exchange demand area to exchange heat between steam and cold molten salt include: Obtain temperature distribution data for the heat exchange demand area; Analyze the temperature distribution data and molten salt storage temperature to determine the actual heat exchange location; The control heat exchange storage device drives the regional heat exchange pipeline to the actual heat exchange location to exchange heat between steam and cold molten salt.

6. A multi-steam-source molten salt energy storage system based on deep peak shaving, characterized in that, include: The acquisition module is used to acquire data on heat demand stage, actual heat exchange area, and molten salt temperature; A memory for storing the program of the multi-steam-source molten salt energy storage method based on deep peak shaving as described in any one of claims 1 to 5; The processor and the program in the memory can be loaded and executed by the processor to implement the multi-steam-source molten salt energy storage method based on deep peak shaving as described in any one of claims 1 to 5.

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