Energy storage steam generation system and method

Abstract

The invention provides an energy storage steam generation system and method, and the system comprises a heat preservation water tank which is internally provided with a first heat exchange pipeline; the fused salt energy storage unit is connected with the heat preservation water tank through a first water supply main pipeline; the desuperheating unit comprises a desuperheater and a desuperheating water branch pipe, the desuperheater is connected with the fused salt energy storage unit through a first steam supply main pipeline, and the desuperheater is communicated with the first water supply main pipeline through the desuperheating water branch pipe; the steam distributing unit comprises a steam distributing cylinder, and the steam distributing cylinder is connected with the desuperheater through a second steam supply main pipeline; the complementary energy utilization unit comprises a drainage output pipeline and a sewage discharge pipeline, and the drainage output pipeline is communicated with the steam header and the first heat exchange pipeline; and the blowdown water pipeline is communicated with the fused salt energy storage unit and the first heat exchange pipeline. After pure water in the heat preservation water tank exchanges heat with high-temperature residual water and drained water, the temperature of the pure water rises, waste heat can be effectively recycled, energy loss is reduced, energy needed by follow-up heating of the pure water is reduced, and therefore energy consumption of the system is reduced.

Description

Technical Field

[0001] The present application relates to the technical fields of thermal energy storage and deep waste heat utilization, and particularly relates to an energy storage steam generation system and method with deep heat release. The system is applicable to application scenarios such as industrial heating, waste heat recovery, and steam power generation, and can significantly improve the heat utilization rate of the molten salt energy storage unit. Background Art

[0002] In industrial production, many technological processes require the supply of high-temperature steam, such as industries like chemical engineering, textiles, paper making, and food processing. The traditional steam supply by combustion boilers has a large carbon emission, making it difficult to meet the demand for low-carbon heating in modern society and causing great pressure on the environment. Against this background, emerging technologies such as electric boilers using clean energy have emerged. These technologies can effectively reduce carbon emissions, such as the molten salt heat storage steam supply system. The principle of the molten salt heat storage steam supply system is to use molten salt heat storage, and conduct heat exchange between low-temperature pure water and high-temperature molten salt. After the low-temperature pure water extracts the high thermal energy of the molten salt, it is converted into steam.

[0003] The existing molten salt heat storage steam supply system mainly relies on the storage and release of heat by molten salt to meet the steam demand at the user end. However, the actual application of the molten salt heat storage steam supply system still faces the dual limitations of heat storage capacity and steam output. Restricted by the heat capacity of the molten salt itself and the scale of the storage tank, the total amount of thermal energy that the system can store is limited, resulting in insufficient supply capacity of high-temperature steam, or more energy needs to be consumed to improve the supply capacity of high-temperature steam. Therefore, it is difficult to meet the demand for long-term and large-flow steam in industrial scenarios. Therefore, how to make full use of the heat of the molten salt heat storage steam supply system and improve the supply capacity of high-temperature steam is an urgent problem to be solved. Summary of the Invention

[0004] The present application relates to an energy storage steam generation system and method with deep heat release, aiming to solve problems such as insufficient utilization of waste heat in the molten salt energy storage unit and waste of waste water and drain heat in the prior art.

[0005] According to the first aspect of the present application, an energy storage steam generation system is provided, including:

[0006] A heat preservation water tank for storing high-temperature water, and a first heat exchange pipeline is arranged in the heat preservation water tank;

[0007] A molten salt energy storage unit connected to the heat preservation water tank through a first main water supply pipeline;

[0008] A desuperheating unit, including a desuperheater and a desuperheating water branch pipe. The desuperheater is connected to the molten salt energy storage unit through a first main steam supply pipeline, and the desuperheater is communicated with the first main water supply pipeline through the desuperheating water branch pipe;

[0009] The steam distribution unit includes a steam separator, and the steam separator is connected to the desuperheater through a second main steam supply pipeline;

[0010] The waste energy utilization unit includes a drain output pipeline and a blowdown pipeline. The drain output pipeline connects the steam separator and the first heat exchange pipeline to recover the waste heat of the drain; the blowdown pipeline connects the molten salt energy storage unit and the first heat exchange pipeline to recover the waste heat of the blowdown water;

[0011] In the steam supply mode, the heat preservation water tank, the first main water supply pipeline, the molten salt energy storage unit, the first main steam supply pipeline, the desuperheater, the second main steam supply pipeline and the steam separator are connected in sequence and then supply the output steam.

[0012] In this way, by recovering the waste heat of high-temperature blowdown water and / or drain, the heating energy consumption of pure water in the heat preservation water tank is reduced, the energy utilization efficiency of the whole system is improved, the operation cost is reduced, and the economic benefit is improved. The recovery and treatment of drain and blowdown water can ensure the normal operation of the molten salt storage tank and the steam separator, increase the inlet water temperature of the molten salt tank, reduce the heat exchange temperature difference of the molten salt energy storage heat exchanger, reduce the thermal stress, and improve the safety and reliability of the system.

[0013] In one implementation, the system further includes:

[0014] A control valve assembly includes a first control valve, a second control valve and a third control valve. The first control valve is arranged on the first main water supply pipeline to control the steam supply; the second control valve is arranged on the blowdown pipeline to control the recovery of the waste heat of the blowdown water; the third control valve is arranged on the drain output pipeline to control the recovery of the waste heat of the drain.

[0015] In one implementation, the molten salt energy storage unit includes a plurality of molten salt storage tanks. The water inlet of each molten salt storage tank is connected to the first main water supply pipeline through a first water supply branch pipe, and the steam outlet of each molten salt storage tank is connected to the first main steam supply pipeline through a first steam supply branch pipe; the first control valve is arranged on each first water supply branch pipe; when all the first control valves are opened, all the molten salt storage tanks are in parallel and can output the first steam simultaneously.

[0016] In this way, when the system needs to provide a large amount of steam in a short time, multiple parallel molten salt storage tanks can work simultaneously to quickly meet the high-load steam demand. In addition, the simultaneous operation of multiple parallel storage tanks can reduce the time for the system to switch from low load to high load and improve the dynamic response ability of the system. When multiple storage tanks operate simultaneously, through centralized control and optimized scheduling, it can be ensured that each storage tank operates under the best working conditions, thereby improving the overall energy utilization efficiency.

[0017] In a multiple parallel molten salt storage tank system, after high-load operation, when the system supplies a large amount of steam due to insufficient molten salt energy storage supply, the amount of high-temperature water supplied to the molten salt energy storage unit can be reduced, enabling the system to switch from high-load operation to low-load operation, adapting to the low-load steam demand, and providing a smaller amount of steam. This mode switch not only improves the flexibility and adaptability of the system but also significantly enhances the economy and reliability of the system by reducing equipment wear, optimizing energy utilization, and lowering operating costs.

[0018] In one implementation, the control valve assembly further includes a fourth control valve and a fifth control valve. The fourth control valve is disposed on a third steam supply pipeline between two molten salt storage tanks in the molten salt energy storage unit, and the fifth control valve is disposed on a first steam supply branch pipe connecting each molten salt storage tank to the desuperheater.

[0019] Open the fourth control valve, the first control valve of the first molten salt storage tank, and the fifth control valve of the second molten salt storage tank, and close the first control valves of other molten salt storage tanks except the first molten salt storage tank and the fifth control valves of other molten salt storage tanks except the second molten salt storage tank, so as to form a series connection among multiple molten salt storage tanks.

[0020] The first molten salt storage tank is a molten salt storage tank close to the insulation water tank among multiple series-connected molten salt storage tanks; the first molten salt storage tank is a molten salt storage tank close to the desuperheater among multiple series-connected molten salt storage tanks.

[0021] In this way, when multiple molten salt storage tanks are connected in series, even if the thermal energy of one molten salt storage tank is insufficient to continue directly generating steam, its molten salt may still contain waste heat at a relatively high temperature; high-temperature water can be prepared for other molten salt storage tanks; this part of the waste heat can be fully utilized to avoid waste of thermal energy. This mode allows multiple molten salt storage tanks to work together to ensure the continuous and stable operation of the entire system.

[0022] In one implementation, the system further includes:

[0023] A control unit, electrically connected to the control valve assembly, for controlling the opening or closing state of each control valve in the control valve assembly.

[0024] According to another aspect of the present application, an energy storage steam generation method is applied to an energy storage steam generation system and is executed by a control unit, including the following steps;

[0025] When starting the steam supply mode of the molten salt energy storage unit, control the high-temperature water in the insulation water tank to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates first steam from the high-temperature water.

[0026] After the first steam is delivered to the desuperheating unit, when it is recognized that the first steam meets the user-side requirements, the control unit controls the heat preservation water tank to deliver desuperheating water to the desuperheating unit, and adjusts the temperature of the first steam by combining the desuperheating water;

[0027] The control unit controls the delivery of the temperature-adjusted first steam to the steam distribution unit. The steam distribution unit separates the temperature-adjusted first steam into condensed water and second steam, and the second steam is supplied for output;

[0028] When it is monitored that pure water is replenished into the heat preservation water tank, the control unit controls the heat exchange between the condensed water and the pure water in the heat preservation water tank, and / or controls the heat exchange between the surplus water in the molten salt energy storage unit and the pure water.

[0029] In this way, when pure water is replenished into the heat preservation water tank, the temperature of the pure water is relatively low and needs to be heated to the saturation temperature. By exchanging heat with the high-temperature condensed water and surplus water, the temperature of the pure water can be quickly increased, reducing the energy and time required for additional heating. The temperature of the water entering the molten salt tank is increased, the heat exchange temperature difference of the molten salt energy storage heat exchanger is reduced, the thermal stress is reduced, and the safety and reliability of the system are improved.

[0030] In one implementation, when the steam supply mode of the molten salt energy storage unit is turned on, the control unit controls the delivery of the high-temperature water in the heat preservation water tank to the molten salt energy storage unit, and the molten salt energy storage unit generates first steam from the high-temperature water. Specifically, the following steps are included:

[0031] When the first demand for the first steam is recognized, the steam supply modes of multiple parallel molten salt storage tanks are turned on simultaneously, and the control unit controls the heat preservation water tank to deliver the high-temperature water to each molten salt storage tank at a first flow rate. The molten salt storage tank performs a first-stage heat release to generate first steam that meets the first demand;

[0032] When the molten salt storage tank completes the first-stage heat release and the second demand for the first steam is recognized, the control unit controls the heat preservation water tank to deliver the high-temperature water to each molten salt storage tank at a second flow rate. The molten salt storage tank performs a second-stage heat release and generates first steam that meets the second demand; the first flow rate is greater than the second flow rate, and the first demand is greater than the second demand.

[0033] In one implementation, the following steps are further included:

[0034] After the molten salt energy storage unit shuts down the steam supply mode, the control unit controls the heat preservation water tank to deliver the pure water to the molten salt energy storage unit. The waste heat of the molten salt energy storage unit is exchanged with the pure water to generate high-temperature water, and the high-temperature water is stored in the heat preservation water tank.

[0035] Thus, even if the molten salt cannot directly generate steam, it may still contain high thermal energy. By exchanging heat with pure water, this part of the waste heat can be recovered and converted into high-temperature water, avoiding waste of thermal energy and improving the overall energy utilization efficiency of the system. This multi-level utilization method can maximize the utilization of thermal energy and reduce energy losses. It reduces the demand for other energy sources by high-temperature water, thereby reducing the operating cost.

[0036] In one implementation, when starting the steam supply mode of the molten salt energy storage unit, it is controlled to deliver the high-temperature water in the heat preservation water tank to the molten salt energy storage unit, and the molten salt energy storage unit generates first steam from the high-temperature water, which specifically includes the following steps:

[0037] When the third demand amount of the first steam is recognized, start the steam supply mode of the first molten salt storage tank, control the heat preservation water tank to deliver the high-temperature water to the first molten salt storage tank, and the first molten salt storage tank performs first-stage heat release to generate first steam that meets the third demand amount from the high-temperature water;

[0038] After the first molten salt storage tank completes the first-stage heat release, start the steam supply mode of the second molten salt storage tank, control the heat preservation water tank to deliver the pure water to the first molten salt storage tank, exchange the waste heat of the first molten salt storage tank with the pure water to generate high-temperature water;

[0039] Control to deliver the high-temperature water to the second molten salt storage tank, and the second molten salt storage tank generates first steam that meets the third demand amount from the high-temperature water.

[0040] Thus, when the system only needs a small amount of steam, it can meet the demand through the operation of a single storage tank without starting all storage tanks. This operation mode can more flexibly adapt to the demand of different loads and avoid waste of energy.

[0041] In one implementation, the method further includes the following steps: when it is monitored that the water quality of the surplus water and / or the hydrophobic water meets the steam generation condition, the control unit controls the surplus water and the hydrophobic water to enter the heat preservation water tank and mix with the pure water. When the water quality of the surplus water and the hydrophobic water does not meet the water quality requirement for generating steam by the electric steam boiler, the surplus water and the hydrophobic water can take out the heat through the heat exchanger of the heat preservation water tank.

[0042] Thus, the recycling of the hydrophobic water reduces the demand for fresh water resources, reduces the water resource consumption of the system, and meets the requirements of sustainable development.

[0043] The present application adopts the above technical solutions and has at least the following beneficial effects:

[0044] The surplus water and hydrophobic water in the system usually have a relatively high temperature. Direct discharge will cause a large amount of heat energy waste. By recycling the surplus water and hydrophobic water, after the pure water in the heat preservation water tank exchanges heat with the high-temperature surplus water and hydrophobic water, the water temperature of the pure water rises, which can effectively recover the waste heat, reduce energy loss, reduce the energy required for subsequent heating of the pure water, and thus reduce the energy consumption of the system. In addition, the recovery and treatment of hydrophobic water and surplus water can increase the water inlet temperature of the molten salt tank on the basis of the normal operation of the single salt and steam separation unit of molten salt energy storage, reduce the heat exchange temperature difference of the molten salt energy storage heat exchanger, reduce the thermal stress, and improve the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings and their labels required in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0046] Figure 1 Structural schematic diagram of an energy storage steam generation system according to an embodiment of the present application;

[0047] Figure 2 Structural schematic diagram of an energy storage steam generation system according to an embodiment of the present application;

[0048] Figure 3 Structural schematic diagram of an energy storage steam generation system according to an embodiment of the present application;

[0049] Figure 4 Structural schematic diagram of a molten salt energy storage unit according to an embodiment of the present application;

[0050] Figure 5 For Figure 4 Structural schematic diagram of the outer cylinder of the molten salt energy storage unit and its first heat exchange pipeline in

[0051] Figure 6 Flow schematic diagram of an energy storage steam generation method according to an embodiment of the present application.

[0052] The meanings of the reference symbols in the drawings are as follows:

[0053] 10 - Water treatment device, 20 - Heat preservation water tank, 30 - Molten salt energy storage unit, 30a - First molten salt storage tank, 30b - Second molten salt storage tank, 31 - Electric heater, 32 - First heat exchange pipeline, 33 - Second heat exchange pipeline, 40 - Desuperheater, 50 - Separator cylinder, 60a - First control valve of the first molten salt storage tank, 60b - Second control valve of the first molten salt storage tank, 61a - First control valve of the second molten salt storage tank, 61b - Second control valve of the first molten salt storage tank, 62 - Third control valve, 63 - Fourth control valve, 64a - Fifth control valve of the first molten salt storage tank, 64b - Fifth control valve of the second molten salt storage tank, 70 - First main feed water pipeline, 71 - First main steam supply pipeline, 72 - Second main steam supply pipeline, 73 - Desuperheating water branch pipe, 74 - Steam recovery pipeline, 80 - Drain output pipeline, 81 - Blowdown pipeline. Detailed implementation manners

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will describe the specific implementation manners of the present application with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0055] For the sake of simplicity of the drawings, only the parts related to the application are schematically shown in each drawing, and they do not represent their actual structures as products. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means the situation of "more than one".

[0056] It should also be further understood that the term "and / or" used in the specification and claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0057] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0058] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0059] In industrial production, high-temperature steam supply is required in many technological processes, such as in industries like chemical engineering, textile, papermaking, and food processing. Traditional steam supply from combustion boilers has a relatively large carbon footprint and is difficult to meet the modern society's demand for low-carbon heating, posing a significant environmental pressure. Against this backdrop, emerging technologies such as boilers using clean energy have emerged. These technologies can effectively reduce carbon emissions. For example, in a molten salt thermal energy storage steam supply system, the core of molten salt thermal energy storage lies in the use of molten salt to absorb, store, and release thermal energy. During the charging stage, the molten salt absorbs solar radiant energy, electrical energy, or industrial waste heat, etc., and its temperature rises to store thermal energy; during the discharging stage, the high-temperature molten salt transfers heat to water or other media through a heat exchanger to generate high-temperature and high-pressure steam.

[0060] Existing molten salt thermal energy storage steam supply systems mainly rely on molten salt to store and release heat to meet the steam demand at the user end. However, the practical application of molten salt thermal energy storage steam supply systems faces dual limitations of heat storage capacity and steam output. Constrained by the heat capacity of the molten salt itself and the scale of the storage tank, the total amount of thermal energy that the system can store is limited, resulting in insufficient supply capacity of high-temperature steam. Or, more energy needs to be consumed to improve the supply capacity of high-temperature steam. Therefore, it is difficult to meet the demand for long-duration and large-flow steam in industrial scenarios.

[0061] In practice, after the molten salt energy storage unit usually stops operating during the high-temperature steam generation stage, a large amount of waste heat inside the system is not fully recovered, resulting in a low heat utilization rate of the system. For example, the waste water generated during the operation of the molten salt energy storage unit and the drain water generated in the steam separator, the waste heat of the waste water and drain water fails to be effectively utilized, resulting in a large amount of waste heat being wasted.

[0062] Therefore, the present application provides an energy storage steam generation system that preheats the pure water entering the insulation water tank by using the waste heat of the waste water in the molten salt energy storage unit and the waste heat of the drain water in the steam separator, thereby increasing the temperature of the pure water entering the insulation water tank; reducing the heat consumption for heating the insulation water tank. Or, it reheats the high-temperature water stored in the insulation water tank by using the waste heat of the waste water in the molten salt energy storage unit and the waste heat of the drain water in the steam separator, increasing the temperature of the high-temperature water output from the insulation water tank, reducing the heat release of the molten salt energy storage unit, enabling the molten salt energy storage unit to generate more steam. Therefore, by fully recovering the waste heat in the energy storage steam generation system, the deep utilization of heat and the improvement of the system operation efficiency are achieved.

[0063] The following is an illustration with reference to the drawings.

[0064] Please refer to Figure 1 which is a schematic diagram of an energy storage steam generation system provided in an embodiment of the present application. As Figure 1 shown, the energy storage steam generation system includes:

[0065] The heat preservation water tank 20 is used to store high-temperature water. A first heat exchange pipeline is arranged in the heat preservation water tank 20. When the heat preservation water tank 20 is connected to the heat pump, the heat pump can heat the pure water in the heat preservation water tank 20 to form high-temperature water during off-peak electricity periods or flat electricity periods. Or, during off-peak electricity periods, the pure water is heated by electric heating to generate high-temperature water. The temperature of the high-temperature water is set slightly lower than the saturation temperature under the corresponding pressure; for example, at normal pressure, the temperature can be set to 90°C to 98°C. This design can flexibly adapt to the operation requirements of different electricity price periods, ensure that the heat preservation water tank 20 maintains a stable high-temperature state, thereby improving the system operation efficiency and reducing the overall energy consumption.

[0066] The molten salt energy storage unit 30 is connected to the heat preservation water tank 20 through the first total water supply pipeline 70. The operation modes of the molten salt energy storage unit 30 mainly include: heat storage mode, steam supply mode, and waste heat utilization mode. When the molten salt energy storage unit 30 is in the heat storage mode, the energy storage medium (molten salt) is heated for energy storage. During off-peak electricity periods, the heat storage mode of the molten salt energy storage unit 30 is turned on, and the heat pump is preferentially used to heat the molten salt to the first temperature (for example, 95°C); then the molten salt is heated to the target temperature (for example, 400°C) by electric heating. This process can ensure that the heat storage medium in the molten salt energy storage unit 30 maintains efficient operation in subsequent steam supply or waste heat utilization modes.

[0067] The desuperheating unit includes a desuperheater 40 and a desuperheating water branch pipe 73. The desuperheater 40 is connected to the molten salt energy storage unit 30 through the first total steam supply pipeline 71, and the desuperheater 40 is communicated with the first total water supply pipeline 70 through the desuperheating water branch pipe 73.

[0068] The steam distribution unit includes a steam header 50. The steam header 50 is connected to the desuperheater 40 through the second total steam supply pipeline 72. During the steam supply process, continuous process drain water is generated when the steam header 50 performs steam-water separation.

[0069] In the steam supply mode, the heat preservation water tank 20, the first total water supply pipeline 70, the molten salt energy storage unit 30, the first total steam supply pipeline 71, the desuperheater 40, the second total steam supply pipeline 72, and the steam header 50 are connected in sequence and then steam is output. That is, when the steam supply mode of the molten salt energy storage unit 30 is turned on, the heat preservation water tank 20 outputs high-temperature water to the molten salt energy storage unit 30. The molten salt in the molten salt energy storage unit 30 releases heat to generate the first steam from the high-temperature water to the desuperheater 40. The desuperheater 40 combines the high-temperature water provided by the heat preservation water tank 20 to adjust the temperature of the first steam and then transports it to the steam header 50. The steam header 50 performs steam-water separation on the temperature-adjusted first steam to form drain water and the second steam, and then supplies and outputs the second steam.

[0070] The residual energy utilization unit includes a drain output pipeline 80 and a blowdown pipeline 81. The drain output pipeline 80 connects the steam separator 50 and the first heat exchange pipeline, and is used to recover the residual heat of the drain. Based on the liquid level and temperature conditions of the high-temperature water in the heat preservation water tank 20, the system can automatically select a real-time or intermittent operation mode to recover the residual heat of the drain: re-introduce the high-temperature drain into the heat preservation water tank 20, and through heat exchange with the replenished pure water, realize the reuse of energy.

[0071] Its blowdown pipeline 81 connects the molten salt energy storage unit 30 and the first heat exchange pipeline, and is used to recover the residual heat of the residual water. When the molten salt energy storage unit 30 stops generating the first steam, for example, when the first steam does not meet the supply conditions (such as steam pressure, steam volume), after closing the steam supply mode, the remaining steam-water mixture (which can also be called residual water) in the molten salt energy storage unit 30 is refluxed to the heat preservation water tank 20. During this process, let the residual water exchange heat with the pure water, and use the residual heat of the residual water to heat the pure water.

[0072] The residual energy utilization unit also includes a steam recovery pipeline 74. The steam recovery pipeline 74 connects the desuperheater 40 and the heat preservation water tank 20, and is used to recover the residual steam heat in the molten salt energy storage unit 30 and / or the desuperheater 40 into the heat preservation water tank 20 for heat exchange with the pure water. When recovering the residual steam heat, the residual steam can be directly introduced into the heat preservation water tank 20, and through heat exchange with the replenished pure water, realize the reuse of energy.

[0073] In this embodiment, the system also includes a water treatment device 10. After the factory tap water is treated by the water treatment device 10, the insoluble substances and most of the ions in the water are filtered out to meet the high-purity requirements. The treated pure water is transported to the heat preservation water tank 20 for storage to ensure the quality and stability of the water used in the subsequent heat supply process.

[0074] In this embodiment, by recovering the residual heat of the drain and / or the residual water, the pure water is heated. When the temperature of the pure water reaches the temperature of the high-temperature water, the pure water is directly converted into high-temperature water, which can timely supplement the supply of high-temperature water. This is equivalent to indirectly increasing the high-temperature water capacity of the heat preservation water tank 20. Therefore, the amount of high-temperature water entering the molten salt energy storage unit 30 during the heat charging process is significantly increased, thereby prompting the molten salt energy storage unit 30 to generate more first steam. Even if the temperature of the pure water fails to reach the temperature of the high-temperature water, heating it by recovering the residual heat can effectively increase the temperature of the pure water. In this way, the temperature of the warm water entering the molten salt energy storage unit 30 is increased, thereby reducing the heat release of the molten salt energy storage unit 30 and further prompting the molten salt energy storage unit 30 to generate more first steam.

[0075] In one embodiment, a control valve (also referred to as a flow control valve) is typically arranged on a fluid conveying pipeline to precisely adjust the medium flow rate and pressure parameters. The energy storage steam generation system further includes: a control valve assembly including a first control valve, a second control valve, and a third control valve. The first control valve is arranged on the first feed water main pipeline for controlling steam supply; the second control valve is arranged on the sewage discharge pipeline for controlling the waste heat recovery of the surplus water; the third control valve is arranged on the drain output pipeline for controlling the waste heat recovery of the drain. Generally, in the steam supply mode, the first control valve is opened and the second control valve is closed; during the waste heat recovery of the surplus water, the second control valve is opened and the first control valve is closed. As a preferred solution, the system further includes a control unit electrically connected to the control valve assembly for controlling the opening or closing state of each control valve in the control valve assembly.

[0076] In this embodiment, to achieve the precise regulation of the control unit, in addition to arranging control valves on the pipeline, a monitoring unit is also required to work in coordination. The monitoring unit includes a variety of sensors, including pressure sensors, temperature sensors, flow sensors, and water quality monitoring sensors (such as pH sensors, conductivity sensors, turbidity sensors, dissolved oxygen sensors, residual chlorine sensors, etc.). Through the comprehensive application of the above sensors, the system can monitor the steam pressure, steam temperature, steam flow rate, and water quality parameters in real time. These monitoring data will provide accurate feedback information for the control unit, thereby realizing the precise control of the system and ensuring the stability and reliability of the system operation.

[0077] In one embodiment, as Figure 1 , 2 shown, the molten salt energy storage unit includes a plurality of molten salt storage tanks (taking two molten salt storage tanks as an example, the first molten salt storage tank 30a and the second molten salt storage tank 30b). The water inlet of each molten salt storage tank is connected to the first feed water main pipeline 70 through a first feed water branch pipe, and the steam outlet of each molten salt storage tank is connected to the first steam supply main pipeline 71 through a first steam supply branch pipe; a first control valve is arranged on each first feed water branch pipe (such as a first control valve 60a is arranged on the first feed water branch pipe of the first molten salt storage tank 30a, and a first control valve 60b is arranged on the first feed water branch pipe of the second molten salt storage tank 30b); when all the first control valves (such as the first control valve 60a and the first control valve 60b) are opened, all the molten salt storage tanks (such as the first molten salt storage tank 30a and the second molten salt storage tank 30b) are in parallel and can output the first steam simultaneously.

[0078] In the scenario where the steam demand is large, a plurality of molten salt storage tanks are arranged in parallel, and the heat preservation water tank 20 conveys high-temperature water to each molten salt storage tank at a first flow rate. The molten salt storage tanks perform a first-stage heat release (such as the temperature of the molten salt changes from 400 °C to 200 °C), and a plurality of molten salt storage tanks generate and output the first steam (high-temperature steam) simultaneously, greatly increasing the generation amount of the first steam.

[0079] When the molten salt storage tank completes the first-stage heat release and the first steam generated and output simultaneously by multiple molten salt storage tanks does not meet the scenario with a large steam demand, the amount of high-temperature water entering each molten salt storage tank is reduced. The heat preservation water tank 20 conveys high-temperature water to each molten salt storage tank at a second flow rate, and the first flow rate is greater than the second flow rate; the molten salt storage tank conducts the second-stage heat release (for example, the temperature of the molten salt changes from 200 °C to 180 °C), enabling multiple molten salt storage tanks to generate and output the first steam simultaneously to meet the scenario with a low steam demand.

[0080] In the scenario with a low steam demand, the first steam (high-temperature steam) can also be generated and output by a single molten salt storage tank. The molten salt storage tank can meet the diverse requirements of the steam demand scenario by changing the water inflow or the connection setting method. When the molten salt storage tank completes the second-stage heat release and does not generate the first steam, the gas supply mode is closed, and the waste heat utilization mode is entered. The heat preservation water tank 20 is controlled to convey pure water to the molten salt storage tank, and the molten salt storage tank conducts the third-stage heat release (for example, the temperature of the molten salt changes from 180 °C to 120 °C). After the waste heat of the molten salt storage tank is exchanged with the pure water, high-temperature water is generated and stored in the heat preservation water tank 20.

[0081] In one embodiment, the control valve assembly further includes a fourth control valve and a fifth control valve. The fourth control valve is arranged on the third steam supply pipeline between two molten salt storage tanks in the molten salt energy storage unit, and the fifth control valve is arranged on the first steam supply branch pipe connecting each molten salt storage tank to the desuperheater. The fourth control valve, the first control valve of the first molten salt storage tank (i.e., the first control valve arranged on the first water supply branch pipe of the first molten salt storage tank), and the fifth control valve of the second molten salt storage tank (i.e., the first control valve arranged on the first steam supply branch pipe of the second molten salt storage tank) are opened, and the first control valves of other molten salt storage tanks except the first molten salt storage tank and the fifth control valves of other molten salt storage tanks except the second molten salt storage tank are closed, so as to form a series connection between multiple molten salt storage tanks. The first molten salt storage tank is a molten salt storage tank close to the heat preservation water tank among the multiple series-connected molten salt storage tanks; the first molten salt storage tank is a molten salt storage tank close to the desuperheater among the multiple series-connected molten salt storage tanks.

[0082] Taking two molten salt storage tanks as an example, namely the first molten salt storage tank 30a and the second molten salt storage tank 30b, as Figure 3As shown, in a scenario with low steam demand, when the first steam is generated and output by a single molten salt storage tank, after the steam supply mode of the first molten salt storage tank is turned on, the first control valve 60a and the fifth control valve 64a are opened, and the heat preservation water tank 20 conveys high-temperature water to the first molten salt storage tank. The first molten salt storage tank performs the first-stage heat release (for example, the temperature of the molten salt changes from 400 °C to 200 °C), and generates the first steam by heating the high-temperature water. When the first molten salt storage tank completes the first-stage heat release, the first molten salt storage tank enters the waste heat utilization mode. The steam supply mode of the second molten salt storage tank is turned on, the first control valve 60a of the first molten salt storage tank 30a, the fourth control valve 63, and the fifth control valve 64b of the second molten salt storage tank 30b are opened, the first control valve 60b of the second molten salt storage tank 30b and the fifth control valve 64a of the first molten salt storage tank 30a are closed. The heat preservation water tank 20 is controlled to convey pure water to the first molten salt storage tank. The first molten salt storage tank performs the second and third-stage heat releases (for example, the temperature of the molten salt changes from 200 °C to 120 °C), exchanges the waste heat of the first molten salt storage tank with pure water to generate high-temperature water, conveys the high-temperature water to the second molten salt storage tank, and the first molten salt storage tank performs the first-stage heat release (for example, the temperature of the molten salt changes from 400 °C to 200 °C). The second molten salt storage tank generates the first steam from the high-temperature water.

[0083] In one embodiment, the control valve assembly further includes a sixth control valve, a seventh control valve, and an eighth control valve. The sixth control valve is arranged on the desuperheating water branch pipe 73 and is used to control the heat preservation water tank to supply desuperheating water to the desuperheater. The seventh control valve is arranged on the second steam supply main pipeline 72, and the eighth control valve is arranged on the steam recovery pipeline 74. When the seventh control valve is opened and the eighth control valve is closed, the desuperheater conveys steam to the steam distribution cylinder for supplying steam to the user side; when the seventh control valve is closed and the eighth control valve is opened, the desuperheater conveys the remaining steam to the heat preservation water tank for recovering the waste heat of the remaining steam.

[0084] In one implementation, referring to Figure 4 and Figure 5 , the molten salt storage tank adopts a double-layer structure of an outer cylinder and an inner cylinder. The inner cylinder can be one or more. Multiple inner cylinders can be concentrically sleeved or independently distributed. The inside of the inner cylinder can be hollow or filled with a heat storage medium (molten salt); the space between the outer cylinder and the inner cylinder is filled with a heat storage medium (molten salt). Different types of molten salts are selected according to specific working conditions. For example, the inner cylinder is filled with a low-melting-point molten salt (melting point lower than 100 °C), and the space between the outer cylinder and the inner cylinder is filled with a high-melting-point molten salt (melting point higher than 100 °C) to achieve different temperature operating ranges in different scenarios. The heat storage medium is selected as a low-melting-point molten salt with a melting point lower than 100 °C, which can support the gradient heat release of the heat storage medium from high temperature to low temperature and achieve the comprehensive utilization of heat through the deep heat release function. In order to realize the heat exchange between water and molten salt, a heat exchange pipeline for water circulation is arranged inside the molten salt storage tank. A single heat exchange pipeline can be set to continuously generate a small amount of steam; multiple heat exchange pipelines can also be set to simultaneously generate a large amount of steam and release heat fully.

[0085] As a preferred solution, when the molten salt storage tank adopts a double-layer structure of an outer cylinder and an inner cylinder, a first heat exchange pipeline 32 is arranged on the inner wall of the outer cylinder and a second heat exchange pipeline 33 is arranged on the outer wall of the inner cylinder. The first heat exchange pipeline 32 and the second heat exchange pipeline 33 can be arranged in series or in parallel. The first heat exchange pipeline 32 and the second heat exchange pipeline 33 can be used simultaneously in the steam supply mode or simultaneously in the waste heat utilization mode. It can also be that one of the first heat exchange pipeline 32 and the second heat exchange pipeline 33 is used in the steam supply mode to heat high-temperature water to output first steam; the other pipeline is used in the waste heat utilization mode to recover the waste heat of the molten salt and enable the molten salt to achieve deep heat release.

[0086] In one implementation, when multiple molten salt storage tanks are arranged in parallel, when all the molten salt storage tanks are in the steam supply mode, the first heat exchange pipelines 32 of all the molten salt storage tanks are arranged in parallel, that is, the first heat exchange pipelines 32 in each molten salt storage tank are respectively connected to the heat preservation water tank 20 and the desuperheating unit, and the heat preservation water tank 20 is controlled to deliver high-temperature water to all the first heat exchange pipelines 32 according to a first flow rate. The first heat exchange pipeline 32 is used to heat high-temperature water to output first steam, realizing the first-stage heat release of the molten salt (for example, the temperature of the molten salt changes from 400 °C to 200 °C).

[0087] When the molten salt in all the molten salt storage tanks has completed the first-stage heat release, the second heat exchange pipelines 33 of the molten salt storage tanks are arranged in parallel, that is, the second heat exchange pipelines 33 in each molten salt storage tank are respectively connected to the heat preservation water tank 20 and the desuperheating unit, and the heat preservation water tank 20 is controlled to deliver high-temperature water to all the second heat exchange pipelines 33 according to a second flow rate. The second heat exchange pipeline 33 is used to heat high-temperature water to output first steam, realizing the second-stage heat release of the molten salt (for example, the temperature of the molten salt changes from 200 °C to 180 °C).

[0088] When the molten salt in all the molten salt storage tanks has completed the second-stage heat release, after the steam supply mode is closed, the waste heat utilization mode is entered. The first heat exchange pipelines 32 and the second heat exchange pipelines 33 in each molten salt storage tank are arranged in parallel, that is, the first heat exchange pipelines 32 and the second heat exchange pipelines 33 in each molten salt storage tank are both connected to the heat preservation water tank 20, and the heat preservation water tank 20 is controlled to deliver pure water to the first heat exchange pipeline and the second heat exchange pipeline in each molten salt storage tank. The pure water generates high-temperature water after absorbing the waste heat released by the molten salt, realizing the third-stage heat release of the molten salt (for example, the temperature of the molten salt changes from 180 °C to 120 °C). The high-temperature water is stored in the heat preservation water tank 20. The molten salt storage tank realizes gradient heat release through different connection forms of the first and second heat exchange pipelines, greatly improving the heat utilization efficiency of the molten salt storage tank.

[0089] In one implementation, when multiple molten salt storage tanks are arranged in series, taking three molten salt storage tanks, namely Molten Salt Storage Tank A, Molten Salt Storage Tank B, and Molten Salt Storage Tank C, arranged in series as an example, the molten salt storage tanks are sequentially turned on to the gas supply mode. When the steam supply mode of Molten Salt Storage Tank A is turned on, the first heat exchange pipeline 32 and the second heat exchange pipeline of Molten Salt Storage Tank A are respectively connected to the heat preservation water tank 20 and the desuperheating unit. The heat preservation water tank 20 is controlled to supply high-temperature water to the first heat exchange pipeline 32 and the second heat exchange pipeline at a first flow rate. After the high-temperature water absorbs the heat released by the molten salt, high-temperature steam is formed, realizing the first-stage heat release of the molten salt (for example, the temperature of the molten salt changes from 400 °C to 200 °C).

[0090] After Molten Salt Storage Tank A completes the first-stage heat release, Molten Salt Storage Tank A is switched from the steam supply mode to the waste heat utilization mode, and the steam supply mode of Molten Salt Storage Tank B is turned on. The first heat exchange pipeline and the second heat exchange pipeline in Molten Salt Storage Tank A stop generating high-temperature steam. The heat preservation water tank 20 supplies pure water to the first heat exchange pipeline and the second heat exchange pipeline in Molten Salt Storage Tank A at a first flow rate. The pure water in the second heat exchange pipeline absorbs the waste heat released by the molten salt and generates high-temperature water, which is then transported to the first heat exchange pipeline and the second heat exchange pipeline of Molten Salt Storage Tank B; the high-temperature water absorbs the heat released by the molten salt and forms first-stage steam, realizing the second-stage heat release of the molten salt in Molten Salt Storage Tank A (for example, the temperature of the molten salt changes from 200 °C to 120 °C) and the first-stage heat release of the molten salt in Molten Salt Storage Tank B (for example, the temperature of the molten salt changes from 400 °C to 200 °C).

[0091] After Molten Salt Storage Tank A completes the second and third stages of heat release and Molten Salt Storage Tank B completes the first-stage heat release, Molten Salt Storage Tank B is switched from the steam supply mode to the waste heat utilization mode, and the gas supply mode of Molten Salt Storage Tank C is turned on. After the pure water is preheated by the second heat exchange pipeline in Molten Salt Storage Tank A, it returns to the heat preservation water tank 20, realizing the fourth-stage heat release of the molten salt (for example, the temperature of the molten salt changes from 120 °C to 98 °C). The heat preservation water tank 20 supplies pure water to the first heat exchange pipeline and the second heat exchange pipeline in Molten Salt Storage Tank B at a first flow rate. The pure water in the first heat exchange pipeline and the second heat exchange pipeline absorbs the waste heat released by the molten salt and generates high-temperature water, which is then transported to the first heat exchange pipeline and the second heat exchange pipeline of Molten Salt Storage Tank C; the high-temperature water absorbs the heat released by the molten salt and forms first-stage steam, realizing the second and third stages of heat release of the molten salt in Molten Salt Storage Tank B (for example, the temperature of the molten salt changes from 200 °C to 120 °C) and the first-stage heat release of the molten salt in Molten Salt Storage Tank C (for example, the temperature of the molten salt changes from 400 °C to 200 °C).

[0092] When multiple molten salt storage tanks are arranged in series, not only can the molten salt storage tank with a lower temperature provide the second and third-stage waste heat for the molten salt storage tank with a higher temperature, but also the molten salt temperature in the molten salt storage tank can be reduced below the melting point, slightly lower than the melting point, to preheat pure water and release the fourth-stage waste heat. Through the staged waste heat utilization design, the goal of deep heat release of the system is further achieved, and the overall heat utilization rate is significantly improved.

[0093] In one implementation, the heat preservation water tank 20 is arranged below the location of the molten salt storage tank. Both the surplus water and the drain water can flow into the heat exchange pipeline in the heat preservation water tank 20 for heat exchange. The heat is fully absorbed by the low-temperature water in the heat preservation water tank 20 and then discharged, improving the thermal efficiency of the system. When the quality of the surplus water and the drain water meets the steam generation conditions, the surplus water and the drain water can enter the heat preservation water tank 20 and be mixed with the pure water. When the quality of the surplus water and the drain water does not meet the water quality requirements for generating steam in the electric steam boiler, the surplus water and the drain water can exchange heat through the heat exchanger (or heat exchange pipeline) of the heat preservation water tank to take out the heat.

[0094] A pressure regulating component, a temperature monitoring unit and a water level sensor are arranged on the heat preservation water tank 20. High-efficiency heat preservation materials are arranged inside the heat preservation water tank 20 to reduce heat dissipation. The pressure regulating component consists of a pressure sensor, a pressure regulating pump and a pressure control module, and can adjust the internal pressure of the water tank in real time. When the temperature monitoring unit monitors that the temperature of the high-temperature water exceeds 100 °C, the pressure regulating component automatically increases the internal pressure to store the high-temperature water (high-temperature water); keep the high-temperature water in the water tank in a liquid state, so as to prevent the loss of vaporization heat. For example, under normal pressure, the target temperature can be set to 90 °C to 98 °C; when the internal pressure of the heat preservation water tank 20 is increased to 0.2 MPa through the pressure regulating component, the target temperature can be adjusted to 110 °C to 118 °C, matching the saturation temperature at this pressure. At the same time, the heat preservation water tank 20 monitors the water volume state through the water level sensor to ensure the water supply stability during the operation of the system.

[0095] Based on the same technical concept, such as Figure 6 , this application also provides an energy storage steam generation method, which is applied to an energy storage steam generation system and is executed by a control unit. The control unit includes a processor, and specifically includes the following steps:

[0096] S10. Turn on the steam supply mode of the molten salt energy storage unit, control the high-temperature water in the heat preservation water tank to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water.

[0097] In step S10, the time to start the molten salt energy storage unit can be during the flat power period, or during the steam demand period (i.e., the steam demand period on the user side), or a set period during the flat power period. When the steam supply mode of the molten salt energy storage unit is turned on, it can be directly switched from the energy storage mode to the steam supply mode, or the steam supply mode can be directly turned on after the molten salt energy storage unit completes energy storage. Regarding the steam generation process of the molten salt energy storage unit, refer to the foregoing system embodiment.

[0098] S20. After the first steam is transported to the desuperheating unit, when it is recognized that the first steam meets the user-side requirements, control the insulation water tank to transport desuperheating water to the desuperheating unit, and adjust the temperature of the first steam by combining the desuperheating water.

[0099] In step S20, the control unit analyzes whether the first steam meets the user-side requirements by docking with the data transmitted by the monitoring unit (such as steam pressure data, steam temperature data, steam volume data, etc.). When it is analyzed (or recognized) that the first steam meets the user-side requirements, the first steam is adjusted according to the user-side requirements (such as steam pressure and steam temperature).

[0100] S30. Control the temperature-adjusted first steam to be transported to the steam distribution unit. The steam distribution unit separates the temperature-adjusted first steam into drain water and second steam, and the second steam is supplied for output.

[0101] In step S30, the control unit adjusts the supply output volume of the second steam according to the user-side requirements (such as steam volume).

[0102] S40. When it is monitored that pure water is replenished into the insulation water tank, control the waste water in the molten salt energy storage unit to exchange heat with the pure water. As a form of heat exchange, when it is monitored that the quality of the waste water meets the steam generation conditions, the waste water directly enters the insulation water tank and is mixed with the pure water.

[0103] In step S40, when pure water is replenished into the insulation water tank, it can be when it is monitored that the high-temperature water inside the insulation water tank is insufficient, and the control unit is notified to control the insulation water tank to replenish pure water; or when it is monitored that the first steam does not meet the user-side requirements, or the steam supply mode of the molten salt energy storage unit is turned off, or the waste heat utilization mode of the molten salt energy storage unit is turned off, the control unit is notified to control the insulation water tank to replenish pure water to realize the heat exchange between the waste water and the pure water.

[0104] S50. When it is monitored that pure water is replenished into the insulation water tank, control the drain water to exchange heat with the pure water in the insulation water tank. As a form of heat exchange, when it is monitored that the quality of the drain water meets the steam generation conditions, the drain water directly enters the insulation water tank and is mixed with the pure water.

[0105] In step S50, when pure water is replenished into the heat preservation water tank, it can be that when it is detected that the high-temperature water inside the heat preservation water tank is insufficient, the control unit is notified to control the replenishment of pure water into the heat preservation water tank; or it can be that the control unit controls the replenishment of pure water into the heat preservation water tank according to the set time, and at the same time controls the hydrophobic water to enter the heat preservation water tank according to the set time to exchange heat with the pure water.

[0106] In this embodiment, before the molten salt energy storage unit supplies steam or after the waste heat utilization is completed, it is also necessary to charge the molten salt energy storage unit to complete the energy storage of the molten salt energy storage unit, and heat the pure water in the heat preservation water tank to the saturation temperature to form high-temperature water. In this process, the steps executed by the control unit include the following steps:

[0107] During the valley electricity period or the low-load period of flat electricity, the energy storage mode of the molten salt energy storage unit is turned on, and the heat pump device is controlled to heat the molten salt to the first temperature (such as 90°C) to make full use of the high-efficiency heating capacity of the low-cost heat pump; then the electric heater 31 is controlled to heat the molten salt from the first temperature to the fourth temperature (such as 400°C) to ensure sufficient heat reserve during the steam supply period.

[0108] During the valley electricity period or the low-load period of flat electricity, the heat pump device and / or the electric heater are controlled to heat the pure water to the saturation temperature to form high-temperature water.

[0109] In this embodiment, after the molten salt energy storage unit executes the steam supply mode for a period of time, when it is monitored that the first steam in the desuperheating unit does not meet the user-side demand, the following steps are also included: when it is recognized that the first steam in the desuperheating unit does not meet the user-side demand, control the first steam to be transported to the heat preservation water tank to heat the pure water in the heat preservation water tank.

[0110] During the entire operation process, the system significantly improves the heat utilization efficiency and heat supply stability of the system through the waste heat recovery of the hydrophobic water and the surplus water, meeting the diversified industrial heat supply demands.

[0111] In one implementation manner, controlling the high-temperature water in the heat preservation water tank to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water, specifically includes the following steps:

[0112] When the first demand for the first steam is recognized, the steam supply modes of multiple parallel molten salt storage tanks are turned on at the same time, and the heat preservation water tank is controlled to transport the high-temperature water to each molten salt storage tank according to the first flow rate, and all the molten salt storage tanks perform the first-stage heat release to generate the first steam that meets the first demand from the high-temperature water;

[0113] When the molten salt storage tank completes the first-stage heat release (or the steam volume of the first steam does not meet the first demand), when the second demand for the first steam is recognized, control the insulation water tank to transport high-temperature water to each molten salt storage tank at the second flow rate. All molten salt storage tanks perform the second-stage heat release and generate the first steam that meets the second demand; the first flow rate is greater than the second flow rate, and the first demand is greater than the second demand.

[0114] In this embodiment, when the molten salt storage tank cannot generate the first steam, it further includes the steps: after the molten salt energy storage unit closes the steam supply mode (or the steam volume of the first steam does not meet the second demand), control the insulation water tank to transport pure water to the molten salt energy storage unit. After exchanging heat between the waste heat of the molten salt energy storage unit and the pure water, high-temperature water is generated and stored in the insulation water tank.

[0115] In another implementation, control the high-temperature water in the insulation water tank to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water. Specifically, it includes the following steps:

[0116] When the third demand for the first steam is recognized, turn on the steam supply mode of the first molten salt storage tank, control the insulation water tank to transport high-temperature water to the first molten salt storage tank, and the first molten salt storage tank performs the first-stage heat release to generate the first steam that meets the third demand from the high-temperature water;

[0117] After the first molten salt storage tank completes the first-stage heat release (or the steam volume of the first steam does not meet the second demand), turn on the steam supply mode of the second molten salt storage tank, control the insulation water tank to transport pure water to the first molten salt storage tank, and exchange heat between the waste heat of the first molten salt storage tank and the pure water to generate high-temperature water;

[0118] Control the high-temperature water to be transported to the second molten salt storage tank, and the second molten salt storage tank generates the first steam that meets the third demand from the high-temperature water.

[0119] In the above embodiments, the second demand and the third demand for the first steam are the same or different. Through staged and step-by-step heat release, the deep utilization of the molten salt storage tank is realized. The switching between the parallel and series modes optimizes the cooperation efficiency in different temperature ranges, significantly improving the response speed and stability of steam supply. At the same time, through the preheating and waste heat recovery of the molten salt storage tank, the operating cost is reduced, the economy and environmental adaptability of the system are enhanced, providing an efficient and stable solution for industrial steam use under complex working conditions.

[0120] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An energy storage steam generation system, characterized in that: include: An insulated water tank, used for storing high-temperature water, wherein a first heat exchange pipeline is arranged in the insulated water tank; A molten salt energy storage unit is connected to the thermal insulation water tank via a first water supply main pipeline; A temperature reduction unit, comprising a temperature reducer and a temperature reduction water branch pipe, wherein the temperature reducer is connected to the molten salt energy storage unit through a first steam supply main pipeline, and the temperature reducer is connected to the first water supply main pipeline through the temperature reduction water branch pipe; A steam separation unit, comprising a steam separation cylinder, wherein the steam separation cylinder is connected to the desuperheater via a second steam supply main pipeline; The waste energy utilization unit includes a drain output pipeline and a sewage pipeline, wherein the drain output pipeline is connected to the steam cylinder and the first heat exchange pipeline to recover the waste heat of the drain; the sewage pipeline is connected to the molten salt energy storage unit and the first heat exchange pipeline to recover the waste heat of the waste water; In the steam supply mode, the insulated water tank, the first water supply main pipeline, the molten salt energy storage unit, the first steam supply main pipeline, the desuperheater, the second steam supply main pipeline and the steam cylinder are connected in sequence to supply output steam.

2. The energy storage steam generation system according to claim 1, characterized in that: Also includes: The control valve assembly includes a first control valve, a second control valve and a third control valve. The first control valve is arranged on the first water supply main pipeline to control the steam supply; the second control valve is arranged on the sewage pipeline to control the waste heat recovery of the residual water; the third control valve is arranged on the drain output pipeline to control the waste heat recovery of the drain.

3. The energy storage steam generation system according to claim 2, characterized in that: The molten salt energy storage unit includes multiple molten salt storage tanks, the water inlet of each molten salt storage tank is connected to the first water supply main pipeline through a first water supply branch pipe, and the steam outlet of each molten salt storage tank is connected to the first steam supply main pipeline through a first steam supply branch pipe; each first water supply branch pipe is provided with the first control valve; when all the first control valves are opened, all the molten salt storage tanks are connected in parallel and can output the first steam simultaneously.

4. An energy storage steam generation system according to claim 2 or 3, characterized in that: The control valve assembly further includes a fourth control valve and a fifth control valve, wherein the fourth control valve is arranged on a third steam supply pipeline between two molten salt storage tanks in the molten salt energy storage unit, and the fifth control valve is arranged on a first steam supply branch pipe connected between each molten salt storage tank and the desuperheater; Open the fourth control valve, the first control valve of the first molten salt storage tank, and the fifth control valve of the second molten salt storage tank, and close the first control valves of other molten salt storage tanks except the first molten salt storage tank and the fifth control valves of other molten salt storage tanks except the second molten salt storage tank, so that multiple molten salt storage tanks are connected in series; The first molten salt storage tank is a molten salt storage tank close to the thermal insulation water tank among multiple molten salt storage tanks connected in series; the first molten salt storage tank is a molten salt storage tank close to the desuperheater among multiple molten salt storage tanks connected in series.

5. The energy storage steam generation system according to claim 2, characterized in that: Also includes: A control unit is electrically connected to the control valve assembly and is used to control the opening or closing state of each control valve in the control valve assembly.

6. A method for generating energy storage steam, characterized in that: Applied in an energy storage steam generation system, the method is executed by a control unit and includes the following steps: When the steam supply mode of the molten salt energy storage unit is turned on, the high-temperature water in the thermal insulation water tank is controlled to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water; After the first steam is delivered to the cooling unit, when it is identified that the first steam meets the user's requirements, the heat preservation water tank is controlled to deliver cooling water to the cooling unit, and the first steam is temperature-adjusted in combination with the cooling water; Controlling the first steam after temperature adjustment to be delivered to a steam separation unit, wherein the steam separation unit separates steam and water from the first steam after temperature adjustment to form hydrophobic and second steam, and the second steam is supplied and outputted; When it is monitored that the insulated water tank is replenished with pure water, the hydrophobic water is controlled to exchange heat with the pure water in the insulated water tank, and / or the residual water in the molten salt energy storage unit is controlled to exchange heat with the pure water.

7. The energy storage steam generation method according to claim 6, characterized in that: When the steam supply mode of the molten salt energy storage unit is turned on, the high-temperature water in the insulated water tank is controlled to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water, which specifically includes the following steps: When a first demand for the first steam is identified, steam supply modes of a plurality of molten salt storage tanks arranged in parallel are simultaneously turned on, the thermal insulation water tank is controlled to deliver the high-temperature water to each molten salt storage tank at a first flow rate, and the molten salt storage tank performs a first step heat release to generate first steam that meets the first demand from the high-temperature water; After the molten salt storage tank completes the first-step heat release and identifies the second demand for the first steam, the thermal insulation water tank is controlled to deliver the high-temperature water to each molten salt storage tank at a second flow rate, and the molten salt storage tank performs the second-step heat release and generates the first steam that meets the second demand; the first flow rate is greater than the second flow rate, and the first demand is greater than the second demand.

8. The energy storage steam generation method according to claim 6 or 7, characterized in that: The following steps are also included: When the molten salt energy storage unit turns off the steam supply mode, the insulated water tank is controlled to transport the pure water to the molten salt energy storage unit, and the waste heat of the molten salt energy storage unit is exchanged with the pure water to generate high-temperature water, which is stored in the insulated water tank.

9. The energy storage steam generation method according to claim 8, characterized in that: When the steam supply mode of the molten salt energy storage unit is turned on, the high-temperature water in the insulated water tank is controlled to be transported to the molten salt energy storage unit, and the molten salt energy storage unit generates the first steam from the high-temperature water, which specifically includes the following steps: When the third demand for the first steam is identified, the steam supply mode of the first molten salt storage tank is turned on, the thermal insulation water tank is controlled to transport the high-temperature water to the first molten salt storage tank, and the first molten salt storage tank performs a first step heat release to generate the first steam that meets the third demand from the high-temperature water; When the first molten salt storage tank completes the first step of heat release, the steam supply mode of the second molten salt storage tank is turned on, and the insulated water tank is controlled to transport the pure water to the first molten salt storage tank, and the waste heat of the first molten salt storage tank is exchanged with the pure water to generate high-temperature water; The high-temperature water is controlled to be transported to the second molten salt storage tank, and the second molten salt storage tank generates the first steam that meets the third demand from the high-temperature water.

10. The energy storage steam generation method according to claim 6, characterized in that: The following steps are also included: When it is monitored that the water quality of the residual water and / or drain meets the steam generation condition, the control unit controls the residual water and drain to enter the thermal insulation water tank and mix with the pure water.

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