Energy storage coupling heat pump steam generation method and system

Abstract

According to the energy storage coupling heat pump steam generation method and system, the mode that the heat pump device and the energy storage device cooperatively operate is adopted, and efficient and economical steam supply is achieved. The method comprises the steps that high-temperature water is prepared and stored in the off-peak electricity period through the heat pump device, and the high-temperature water is further heated through the energy storage device to generate superheated steam for a user to use. The energy storage device comprises a plurality of energy storage modules, and a heat exchange pipeline of the energy storage device can be switched between a parallel connection mode and a series connection mode through switching, so that deep heat release and flexible regulation and control are achieved. According to the method, the energy storage capacity and heat release power of the energy storage module are dynamically adjusted, enthalpy increment distribution of the heat pump and the energy storage device is optimized in combination with load prediction, and diversified steam requirements are met. And meanwhile, preheating or dynamic supplement is conducted on the energy storage module through the heat pump device, waste heat recovery is achieved, and the energy efficiency is improved. According to the method, the operation cost is remarkably reduced, the capacity of the system for adapting to load fluctuation is enhanced, and the method is suitable for industrial steam use scenes and has the advantages of being efficient, stable and flexible.

Description

Technical Field

[0001] The present invention belongs to the field of energy utilization and energy storage technology, and relates to a method and system for generating steam by an energy storage-coupled heat pump, and in particular to a comprehensive system and operation method for efficiently preparing high-temperature water by a heat pump and further heating the high-temperature water into steam through an energy storage module. Background Art

[0002] With the advancement of energy conservation and emission reduction policies, industrial production has an increasing demand for efficient and clean steam heating systems. Traditional combustion boilers are gradually being replaced by more environmentally friendly electric heating and energy storage technologies due to their low efficiency and high carbon emissions. However, existing electric heating and energy storage systems still have limitations in terms of energy efficiency and operational flexibility. For example, systems that rely solely on electric heating have low energy efficiency and high operating costs; the heat release depth of the energy storage module is insufficient, resulting in low heat utilization efficiency; in addition, under peak and valley electricity price conditions, the failure to fully utilize valley electricity for energy storage also increases the operating costs of the system.

[0003] In recent years, heat pumps have been widely used in heating systems due to their high energy efficiency. However, in the prior art, the degree of coupling between heat pumps and energy storage modules is insufficient, making it difficult to flexibly adjust the operating mode under different heat demand and electricity price conditions. In addition, the thermal capacity of the energy storage module is poorly matched with the heat release performance, which limits the further improvement of the overall efficiency and economy of the system. Therefore, there is an urgent need for a high-efficiency, low-cost and flexible steam generation system to better meet industrial production needs and adapt to complex operating conditions. Summary of the invention

[0004] The present invention provides a method and system for generating steam by a heat pump coupled with an energy storage device, which realizes efficient utilization of energy and flexible satisfaction of heating demand by organically combining the efficient heating characteristics of a heat pump device and the high-density energy storage characteristics of an energy storage device. The present invention uses a heat pump device to heat water from room temperature to high-temperature water close to the saturation temperature during the off-peak period, and stores it in a water storage device. Subsequently, the high-temperature water is further heated to the target steam temperature by using molten salt or other efficient heat storage media through the energy storage device, thereby meeting the steam demand. In this process, the system realizes hierarchical and efficient utilization of energy, significantly reduces the equipment scale and cost by reducing the heat release burden of the energy storage module; at the same time, the energy storage device supports deep heat release design, fully releasing low-grade heat to further improve the overall efficiency. In addition, the coordinated operation mode of the heat pump and the energy storage device can be dynamically adjusted according to the electricity price and steam demand, flexibly realize time staggering, and optimize the economy and operation reliability of the system. The overall solution achieves a balance between energy efficiency, cost and applicability through modular design and dynamic regulation, and can be widely used in industrial heating scenarios to meet the actual needs of energy conservation and emission reduction.

[0005] According to a first aspect of the present invention, there is provided a method for generating steam by an energy storage coupled heat pump, comprising the following steps:

[0006] Using a heat pump device to heat water to a first temperature, the first temperature being a high-temperature water temperature close to a saturation temperature;

[0007] The high-temperature water is further heated from the first temperature to a second temperature using an energy storage device, wherein the second temperature corresponds to the temperature of the first water vapor.

[0008] Some technical solutions also include the following steps:

[0009] The high-temperature water generated by the heat pump device and close to its maximum heating temperature is transported to a water storage device, wherein the first temperature of the high-temperature water includes a temperature range higher than 100° C. The water storage device has sealing and pressurizing functions for maintaining the high-temperature water in a liquid state;

[0010] The high temperature water is stably delivered from the water storage device to the energy storage device to be further heated to a second temperature to generate superheated steam.

[0011] In some technical solutions, the first temperature is lower than the saturation temperature at the corresponding pressure, and the temperature difference ranges from 2 to 10°C, preferably from 4 to 6°C.

[0012] Some technical solutions also include the following steps:

[0013] The first water vapor at the second temperature is mixed with the high-temperature water at the first temperature by using a desuperheater to generate the second water vapor at the third temperature, wherein the third temperature is between the first temperature and the second temperature to meet the demand of the steam using system for steam at different temperatures.

[0014] Some technical solutions also include the following steps:

[0015] Predicting the first steam demand of the steam-using system during the steam supply period;

[0016] During off-peak hours, heat is stored in an energy storage device as electrical heating;

[0017] Controlling the heat pump device to operate at least part of the time during a valley power period to prepare high-temperature water at a first temperature;

[0018] The sum of the second enthalpy increment provided by the energy storage device releasing heat and the first enthalpy increment provided by the heat pump device heating is made to match the enthalpy increment of the first water vapor corresponding to the first steam demand.

[0019] In some technical solutions, the proportion of the heat pump device operating during the off-peak period is determined by the following steps:

[0020] Obtaining power supply capacity that can be used for steam generation during off-peak hours;

[0021] Calculate the second power consumption required by the energy storage device during the off-peak period;

[0022] Calculating a first difference in power between the power supply capacity and the second power consumption;

[0023] When the first difference in electricity is sufficient to complete the preparation of the high-temperature water, the heat pump device completes the preparation of all high-temperature water during the valley electricity period;

[0024] When the first difference in electricity is insufficient to complete the preparation of the high-temperature water, the heat pump device uses the first difference in electricity to complete part of the preparation of the high-temperature water, and the remaining preparation is completed by the heat pump device outside the valley electricity period.

[0025] Some technical solutions also include the following steps:

[0026] Calculate the first power consumption required by the heat pump device to prepare all high-temperature water;

[0027] Calculating a second difference in power between the first difference in power and the first power consumption;

[0028] When the first difference in electricity and the heating capacity of the heat pump device exceed the heating demand of high-temperature water at the first temperature, the second difference in electricity is used to provide preheating heat for the energy storage device through the heat pump device.

[0029] In some technical solutions, during the steam supply period, when the actual steam demand exceeds the first steam demand, additional high-temperature water is prepared by a heat pump device, and supplementary electric heating is performed by an energy storage device.

[0030] In some technical solutions, the energy storage device includes multiple energy storage modules, and the heat exchange pipelines of the multiple energy storage modules are configured to be connected in parallel between any two energy storage modules through switching operations to form multiple steam generating paths, or connected in series to form a single steam generating path.

[0031] In some technical solutions, during the steam supply period, the multiple energy storage modules of the energy storage device release heat through the following steps:

[0032] Connecting the heat exchange pipelines of the plurality of energy storage modules to a parallel structure to form a multi-channel steam generation path, so that the heat storage medium of some energy storage modules releases heat from the fourth temperature to the fifth temperature to generate superheated steam at the second temperature;

[0033] Switch the heat exchange pipelines to be connected in series, so that the energy storage module that has released heat to the fifth temperature provides high-temperature water preheating for the energy storage module with a higher temperature, and at the same time, its heat storage medium further releases heat to the sixth temperature;

[0034] and / or adjusting the heat exchange pipeline of the energy storage module to generate high-temperature water at the first temperature by heating deionized water and storing the water, so that the heat storage medium further releases heat to the seventh temperature;

[0035] And / or adjust the heat exchange pipeline of the energy storage module to generate hot water for heating by heating deionized water, so that the heat storage medium further releases heat to the eighth temperature.

[0036] In some technical solutions, the fifth temperature is higher than the second temperature by a second temperature difference, and the second temperature difference ranges from 20 to 50°C; the sixth temperature is higher than the first temperature by a third temperature difference, and the third temperature difference ranges from 10 to 30°C; the fourth temperature is higher than the sixth temperature by a fourth temperature difference, and the fourth temperature difference is greater than the sum of the second temperature difference and the third temperature difference; and / or

[0037] The seventh temperature is higher than the first temperature by a fifth temperature difference, the fifth temperature difference ranges from 2 to 10° C., preferably from 4 to 6° C.; and / or,

[0038] The eighth temperature is lower than the first temperature.

[0039] In some technical solutions, the energy storage device includes an auxiliary heater for supplementing heating of the fluid in the heat exchange pipeline; or,

[0040] When the heat release power of the energy storage device is insufficient, auxiliary heating is performed through the auxiliary heating module to heat the high-temperature water into first water vapor at a second temperature.

[0041] In some technical solutions, the energy storage capacity and heat release power of the energy storage device are determined by the following steps:

[0042] Predict the first steam demand and maximum steam demand rate during the steam supply period;

[0043] Determining a first ratio between a first enthalpy increment provided by the heat pump device and a second enthalpy increment provided by the energy storage device;

[0044] determining the energy storage capacity according to the first enthalpy increment;

[0045] The heat release power is determined according to the maximum steam demand rate and the first ratio.

[0046] In some technical solutions, the heat pump device includes one or more of a waste heat source heat pump, an air source heat pump, a water source heat pump, and a ground source heat pump, and the heat pump device uses carbon dioxide as a circulating working fluid and operates in a transcritical cycle state; and / or,

[0047] The heat pump device is configured to operate by cascade heating; and / or,

[0048] The heat storage medium of the energy storage device is a low-melting-point mixed molten salt, and its melting point is lower than 100°C.

[0049] In some technical solutions, a day includes at least one energy storage period and one incompletely overlapping steam supply period;

[0050] During the energy storage period, the heat storage medium in the energy storage device is heated by electric heating to store energy;

[0051] During the steam supply period, the heat released by the heat storage medium is used to heat the high-temperature water at the first temperature to the second temperature, thereby generating the first water vapor.

[0052] According to another aspect of the present invention, there is further provided an energy storage coupled heat pump steam generation system, comprising:

[0053] A heat pump device, for heating water to a first temperature, wherein the first temperature is a high-temperature water temperature close to a saturation temperature;

[0054] The energy storage device includes at least one energy storage module, which is filled with a heat storage medium and equipped with a heat exchange pipeline. The heat exchange pipeline is used to receive high-temperature water at the first temperature and further heat it to a second temperature through the heat storage medium to generate first water vapor.

[0055] As a preferred solution, it also includes:

[0056] A water storage device, fluidically connected to the heat pump device, for heat preservation and storage of high-temperature water heated to a first temperature by the heat pump device;

[0057] A first water supply pipeline, connected to the water storage device and the energy storage module, for conveying high-temperature water in the water storage device to the heat exchange pipeline;

[0058] a voltage stabilizing device, connected to the energy storage module, so that the energy storage module supplies the first water vapor to the voltage stabilizing device;

[0059] The desuperheater comprises a steam input port and a desuperheating water input port, wherein the steam input port is connected to the pressure stabilizing device, and the desuperheater is connected to the first water supply pipeline. The desuperheater mixes the water vapor input from the steam input port and the desuperheating water input from the desuperheating water input port, and then outputs second water vapor at a third temperature, wherein the third temperature is lower than the second temperature.

[0060] As a preferred solution, the water storage device has sealing and pressurizing functions, and is used to maintain high-temperature water above 100° C. in a liquid state.

[0061] As a preferred solution, the first water supply pipeline comprises:

[0062] The water supply pump group and the main pipe regulating valve group are connected in series to the energy storage module;

[0063] A desuperheating water branch is led out from between the water supply pump group and the main pipe regulating valve group and connected to the desuperheating water input port;

[0064] The recirculation branch is led out from between the main pipe regulating valve group and the energy storage module and connected to the water storage device to realize the reflux of high-temperature water when the system is running.

[0065] As a preferred solution, the heat exchange pipelines of the plurality of energy storage modules are configured so that they can be connected in parallel between any two energy storage modules through switching operations to form multiple steam generation paths, or connected in series to form a single steam generation path.

[0066] As a preferred solution, it also includes a deionized water supply device,

[0067] The deionized water supply device is suitable for supplying deionized water to the heat pump device, and / or the energy storage module, and / or the desuperheating water input port.

[0068] As a preferred solution, it also includes a second water supply pipeline.

[0069] The second water supply pipeline is connected to the heat pump device and the energy storage module, and is used to transport the high-temperature water generated by the heat pump device to the heat exchange pipeline.

[0070] As a preferred embodiment, a preheating circuit is further included, which includes a third water supply pipeline and a preheating return water pipeline. The third water supply pipeline and the preheating return water pipeline are both connected between the heat pump device and the energy storage module to form a circuit for enabling the heat pump device to heat the heat storage medium below the first temperature.

[0071] As a preferred solution, the third water supply pipeline and the preheating return water pipeline are both connected to the heat exchange pipeline, so that the third water supply pipeline, the heat exchange pipeline, and the preheating return water pipeline are suitable for forming the preheating circuit;

[0072] And / or, the energy storage module is further provided with a preheating pipeline, and the third water supply pipeline and the preheating return water pipeline are both connected to the preheating pipeline, so that the third water supply pipeline, the preheating pipeline, and the preheating return water pipeline are suitable for forming the preheating circuit.

[0073] As a preferred embodiment, the energy storage module includes an outer tube and an inner tube, the inner tube is arranged inside the outer tube, the heat storage medium is arranged between the outer tube and the inner tube, and the heat exchange pipeline includes a first heat exchange pipeline arranged in the outer tube and a second heat exchange pipeline arranged in the inner tube.

[0074] As a preferred solution, the first heat exchange pipeline is a heat exchange coil welded to the inner wall of the outer tube, and the second heat exchange pipeline is a heat exchange coil welded to the outer wall of the inner tube.

[0075] As a preferred solution, the second heat exchange pipeline is also used for preheating the heat storage medium whose temperature is lower than the first temperature.

[0076] As a preferred solution, it also includes:

[0077] Steam pipeline, connecting the energy storage module and the pressure stabilizing device, with a mechanical safety valve on the steam pipeline;

[0078] The steam main pipe is connected to the steam outlet of the desuperheater and is provided with an overpressure relief valve;

[0079] A sewage pipeline is connected to the water supply port of the energy storage module and communicated to the sewage well. A sewage valve is installed on the sewage pipeline.

[0080] As a preferred solution, when multiple energy storage modules are included, a branch pipe regulating valve group is also included, and the branch pipe regulating valve group is arranged between the main pipe regulating valve group and each energy storage module, and is used to adjust the high-temperature water flow entering each energy storage module.

[0081] As a preferred embodiment, the heat storage medium includes at least one of a molten salt heat storage medium, a solid heat storage medium, a thermochemical heat storage medium, and a phase change heat storage medium; and / or,

[0082] The heat pump device includes one or more of a waste heat source heat pump, an air source heat pump, a water source heat pump, and a ground source heat pump, and the heat pump device uses carbon dioxide as a circulating working fluid and operates in a transcritical cycle state; and / or,

[0083] The heat pump device is configured to operate by cascade heating.

[0084] As a preferred solution, the energy storage module further includes an auxiliary heater, and the auxiliary heater is suitable for heating the fluid in the heat exchange pipeline; or,

[0085] The steam generation system further includes an emergency heating module, which includes an emergency heating pipeline. The emergency heating pipeline and the heat exchange pipeline are connected in series or in parallel for auxiliary heating when the heat release power of the energy storage module is insufficient.

[0086] The present invention adopts the above technical solution to have at least the following beneficial effects:

[0087] 1. The present invention organically combines the efficient heating characteristics of the heat pump device and the high-density energy storage characteristics of the energy storage device, fully utilizing the high energy efficiency advantage of the heat pump under low temperature rise conditions, and heating water to high-temperature water close to the saturation temperature; subsequently, the energy storage device further heats the high-temperature water to the target steam temperature using a high-density heat storage medium, thereby realizing graded utilization and efficient conversion of energy; this design not only significantly reduces the amount of heat required to be provided by the energy storage device, thereby reducing the scale and cost of the energy storage module, but also effectively improves the overall energy efficiency of the system, reduces the power consumption per unit of steam, and enhances the economy of the system; in addition, the introduction of high-temperature water optimizes the heat transfer conditions, reduces the heat transfer temperature difference between the heat storage medium and water and the thermal stress of the system, and plays an important role in improving the operating stability of the energy storage device and the service life of the equipment; through the coordinated operation of the heat pump and the energy storage device, the present invention realizes an efficient, economical, and flexible steam generation process to meet the diverse needs of industrial production.

[0088] 2. The present invention heats water to high-temperature water close to the saturation temperature through a heat pump device, and transports it to a water storage device with sealing and pressurizing functions. High-temperature water can be stored without phase change, significantly reducing the safety risks and heat losses caused by the high temperature and high pressure of the steam generation system. In addition, since the water storage device maintains the liquid state of the high-temperature water, the efficiency and uniformity of the subsequent stable supply of high-temperature water to the energy storage device are ensured. Furthermore, by setting a precise temperature difference range (such as 2 to 10°C) between the high-temperature water and the saturation temperature, the operating load of the heat pump is optimized, the decrease in the energy efficiency of the heat pump caused by excessive heating is avoided, and at the same time, high-temperature water with the optimal temperature is provided for the energy storage device. This temperature difference design not only effectively reduces the overall energy consumption of the system, but also reduces the heat transfer temperature difference stress inside the energy storage device, thereby improving the safety of the system operation and the service life of the energy storage module. Through the coordinated optimization of the heat pump and the energy storage device, the present invention realizes an efficient, stable and safe steam generation process.

[0089] 3. The present invention realizes the time staggered heating demand and electricity consumption through the flexible combination operation of heat pump and energy storage device; during the off-peak period, the heat pump operates in a centralized manner to prepare and store high-temperature water; during the flat or peak period, the energy storage device releases heat to meet the steam demand; this design reduces the direct demand for electricity during peak periods and significantly reduces operating costs; at the same time, the system supports dynamic adjustment of the operating mode according to the real-time electricity price, transformer capacity and load demand, adapts to various steam demands, and further improves economy.

[0090] 4. The present invention can adjust the operation strategy in real time according to the steam demand and electricity price fluctuations. For example, when the transformer capacity is insufficient during off-peak hours, the energy storage device is operated first to store energy, and part of the heat pump load is moved to the normal hours. When the waste heat resources are sufficient, the heat pump can also be used to preheat the energy storage device to further optimize the resource utilization efficiency. The dynamic adjustment strategy driven by real-time data achieves the optimization of energy use.

[0091] 5. The present invention proposes that the heat exchange pipelines of the energy storage module can be switched in parallel or in series, which can provide rapid heating through a multi-channel parallel mode when the steam demand is high, and can achieve deep heat release of molten salt through a series mode when the demand is low, thereby maximizing the utilization efficiency of the heat storage medium; further, the heat distribution strategy of the energy storage module in different heat release stages is clarified, and by adjusting the heat exchange pipelines, the target steam temperature can be generated, and the low-temperature heat storage medium can be used for preheating or generating high-temperature water, effectively extending the energy utilization chain in the heat release process; through flexible heat distribution and modular design, not only the dynamic steam demand is met, but also the energy efficiency and operation safety of the system are significantly improved, and the service life of the equipment is extended.

[0092] 6. The energy storage device of the present invention supports a variety of heat storage media, including molten salt, solid energy storage, phase change energy storage and thermochemical energy storage, etc., and can be flexibly configured according to different heat storage requirements; at the same time, the heat pump device can select various types such as waste heat source heat pump, air source heat pump, ground source heat pump, etc., to adapt to various industrial steam use scenarios; preferably, a transcritical carbon dioxide heat pump can be used in the present invention, which realizes the efficient conversion of low-temperature heat source to high-temperature heat carrier through an efficient transcritical cycle, which is particularly suitable for scenarios where high-temperature water close to saturation temperature needs to be prepared; in addition, the heat pump can further increase the outlet temperature range through cascade heating to meet high temperature requirements. The heat storage medium is preferably a low-melting point mixed molten salt (melting point below 100°C), which not only reduces the startup temperature requirement of the energy storage system, but also enhances the feasibility and efficiency of deep heat release, maximizing the energy storage capacity. This flexible configuration and optimal design significantly expands the scope of application of the system, and by performing optimal operation configuration for different environmental conditions and production requirements, it effectively improves the overall energy efficiency and economy of the system and meets the complex needs of industrial steam use.

[0093] 7. The cooling water of the present invention is prepared from high-temperature water and supplied to the inlet of the desuperheater by precisely controlling the flow rate and temperature. The output steam temperature can be flexibly adjusted in industrial scenarios with diverse steam demands to meet the requirements of different processes for steam parameters. The introduction of cooling water also effectively reduces the thermal stress of steam pipes and downstream equipment, extending the service life of the equipment. In addition, the use of cooling water significantly reduces the energy consumption generated by direct superheated steam and avoids the waste of overheating of steam. The mechanism is that the sensible heat exchange between cooling water and steam can quickly balance the steam temperature. At the same time, due to the high specific heat characteristics of water, a larger temperature adjustment range can be achieved with a smaller flow rate. Through precise control of the desuperheater, the present invention not only improves the flexibility and stability of steam supply, but also optimizes the system energy efficiency, reduces operating costs, and adapts to the diverse steam demands in industrial production.

[0094] 8. The molten salt storage tank of the present invention is designed with an inner and outer cylinder structure, and heat exchange coils are arranged on the inner wall of the outer cylinder and the outer wall of the inner cylinder to form an efficient heat exchange system. The design of the inner cylinder is flexible, and multiple concentric circle structures can be arranged, or they can be distributed independently. Different types of molten salt or solid heat exchange materials can be filled inside, or even hollow heat exchange. The outer cylinder heat exchange coil is mainly used for the rapid transfer of high-temperature heat. The inner cylinder heat exchange coil not only realizes the deep heat release of the molten salt, but also can use the heat pump to preheat the molten salt during the valley power period, effectively reducing the system startup time. This structure improves the heat release power and energy efficiency of the storage tank by enhancing the uniformity of heat distribution of the molten salt and avoiding excessive temperature difference. At the same time, the flexibility of the inner cylinder structure enhances the ability of the storage tank to adapt to different heat requirements and operating scenarios, making the system operation more efficient, stable and flexible.

[0095] 9. The branch pipe regulating valve group of the present invention is used to accurately adjust the water flow rate entering each energy storage module, so that the heat release process of the energy storage module is uniform, avoiding local overheating or reduced heat release efficiency due to uneven flow. In addition, when the steam pressure fluctuates, the system timely increases or decreases the flow rate through the water supply mother pipe regulating valve to stabilize the pressure and ensure the stability of steam supply. This flow regulation mechanism not only improves the energy efficiency utilization rate of the energy storage module, but also enhances the flexibility and reliability of the system, and effectively adapts to different load requirements and operating conditions.

[0096] 10. The present invention significantly improves the safety and stability of system operation through a four-level pressure warning design. When the steam pressure fluctuates, the first warning responds quickly to stabilize the pressure by adjusting the water supply main pipe valve group and the recirculation pipeline; the second warning relieves the pressure by opening the overpressure relief valve after the desuperheater and exhausting steam to the air; during the third warning, the system enters an emergency shutdown state, and at the same time discharges the working fluid in the energy storage module through the sewage pipeline to quickly reduce the pressure; the fourth warning ensures that the system and equipment are protected from damage in extreme cases through the automatic tripping of the mechanical safety valve. This multi-level pressure warning mechanism is progressive, which not only realizes the precise control of pressure regulation, but also provides multiple safety guarantees for system operation, significantly reduces the risks caused by overpressure, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings and their marks required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0098] Figure 1 It is a structural schematic diagram of an energy storage coupled heat pump steam generation system according to an embodiment of the present invention;

[0099] Figure 2 This is a schematic structural diagram of an energy storage module according to an embodiment of the present invention;

[0100] Figure 3 for Figure 2 A schematic diagram of the structure of the outer cylinder of the central energy storage module and its first heat exchange pipeline;

[0101] Figure 4 A flow chart of a method for generating steam by an energy storage coupled heat pump according to an embodiment of the present invention;

[0102] Figure 5 A flowchart of a common charging and discharging heat cycle of an energy storage module according to an embodiment of the present invention;

[0103] Figure 6 A flow chart of a method for generating steam by an energy storage coupled heat pump according to an embodiment of the present invention;

[0104] Figure 7 A flow chart of a steam generation process according to an embodiment of the present invention;

[0105] Figure 8 The present invention is a flowchart of a charge and discharge heat cycle of a deep heat release energy storage module according to an embodiment of the present invention.

[0106] The meanings of the symbols in the figure are as follows:

[0107] 11—raw water tank, 12—water treatment device, 13—pure water tank, 20—heat pump device, 30—water storage device, 41—recirculation branch, 42—cooling water branch, 43—drain pipe, 44—steam pipe, 50—energy storage module, 51—electric heater, 52—first heat exchange pipe, 53—second heat exchange pipe, 60—steam cylinder, 70—desuperheater, 81—mechanical safety valve, 82—overpressure relief valve. DETAILED DESCRIPTION

[0108] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0109] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0110] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0111] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0113] In a traditional steam generation system, the heat pump device 20 is mainly used for the initial heating of low-temperature water, while the energy storage device bears the main heat demand from the initial heating to the target steam temperature. However, this design has significant deficiencies in energy distribution and heating efficiency. On the one hand, the high energy efficiency characteristics of the heat pump device 20 have not been fully utilized. The heat pump device 20 exhibits a higher coefficient of performance (COP) under low temperature rise conditions, but due to the failure to optimize its operating range, part of the high-efficiency heat is not effectively utilized, resulting in energy waste in the initial heating stage. On the other hand, since the energy storage device needs to undertake the heating task of a large temperature rise, its heat storage medium needs to handle a large temperature difference, which not only increases the thermal stress of the medium, but also aggravates energy loss and shortens the service life of the energy storage module 50.

[0114] The existence of the above problems may be due to the fact that the coordination between the heat pump device 20 and the energy storage system has not been fully studied. In traditional system design, the heat pump device 20 and the energy storage device are often regarded as independently operated subsystems, lacking the design concept of coordinated optimization. This leads to the mismatch between the high-temperature water temperature output by the heat pump device 20 and the heating starting temperature of the energy storage device, thus failing to achieve efficient coupled utilization of energy.

[0115] Further analysis found that the traditional design failed to fully utilize the valley power operation advantage of the heat pump device 20. The operation of the heat pump device 20 during the valley power period with low electricity prices can significantly reduce the heating cost, but due to the lack of targeted strategies, the operating efficiency of the heat pump device 20 during the valley power period is limited and cannot meet the demand for efficient preparation of high-temperature water close to the saturation temperature. In addition, due to the mismatch between the output temperature of the heat pump device 20 and the heating demand of the energy storage device, the overall energy efficiency of the system did not reach the optimal state, which increased the operating cost and carbon emissions.

[0116] In summary, making full use of the high energy efficiency characteristics of the heat pump device 20 and achieving seamless coupling between its heating range and energy storage range is an important direction for improving the energy efficiency and economy of the system. The present invention realizes efficient high-temperature water preparation during off-peak hours through the coordinated optimization design of the heat pump device 20 and the energy storage device, and further heats it through the energy storage device, thereby realizing the hierarchical utilization of energy and solving the above-mentioned problems existing in the traditional system.

[0117] like Figure 1, shows an energy storage coupled heat pump steam generating system of an embodiment of the present invention, comprising a heat pump device 20, a water storage device 30, an energy storage device, and a variety of pipelines and control components connected thereto. The heat pump device 20 and the energy storage device achieve efficient energy transfer and graded utilization through the water storage device 30. Specifically, the heat pump device 20 is used to heat water to a first temperature during the valley power period, the first temperature being a high-temperature water temperature close to the saturation temperature, and transport the high-temperature water to the water storage device 30; the water storage device 30 is responsible for heat preservation and storage of the high-temperature water heated to the first temperature by the heat pump device 20; the energy storage device further heats the high-temperature water to a second temperature to generate a first water vapor to be transported to the steam utilization system.

[0118] In the specific implementation, refer to Figure 2 and Figure 3 The energy storage device includes at least one energy storage module 50, and each energy storage module 50 adopts a double-layer structure of an outer tube and an inner tube. A heat storage medium (such as molten salt) is filled between the outer tube and the inner tube, and a first heat exchange pipeline 52 and a second heat exchange pipeline 53 are respectively arranged on the inner wall of the outer tube and the outer wall of the inner tube. The first heat exchange pipeline 52 is used for heat transfer of high-temperature water, and the water can be further heated to the first water vapor of the second temperature; the second heat exchange pipeline 53 is used to achieve deep heat release of the heat storage medium, and is preheated by the heat pump device 20 during the valley power period. Preferably, the first heat exchange pipeline 52 is a heat exchange coil welded to the inner wall of the outer tube, and the second heat exchange pipeline 53 is a heat exchange coil welded to the outer wall of the inner tube, and the heat exchange coil can be a vertical serpentine coil. The above design not only optimizes the heat utilization efficiency of the heat storage medium, but also improves the overall energy efficiency of the energy storage device through the double-layer heat exchange structure.

[0119] Furthermore, in order to enhance the applicability and flexibility of the energy storage device, multiple inner cylinders in this embodiment can be provided, and different structural configurations can be adopted. For example, multiple inner cylinders can be stacked on each other to form a concentric circle arrangement, or multiple single inner cylinders can be independently provided. The internal structural design of the inner cylinder supports a variety of implementation methods: it can be filled with molten salt to increase the energy storage capacity, or it can be filled with solid heat exchange materials (such as graphite blocks) to enhance thermal conductivity, and it can even be designed as a hollow structure for direct heat exchange under specific conditions. In addition, the type of molten salt between the inner cylinder and the outer cylinder can be the same, or different types of molten salts can be selected according to specific working conditions, such as the inner cylinder filled with low melting point molten salt and the outer cylinder filled with high melting point molten salt to achieve a wider temperature operating range.

[0120] In order to adapt to large-scale production and subsequent expansion needs, the molten salt energy storage module in this embodiment adopts a modular design, the energy storage capacity of a single module is Q0, and the upper limit of heat release power is P0. The modular design allows the energy storage device to flexibly adjust the number of modules according to specific steam demand, and supports parallel or series operation mode to meet different working conditions.

[0121] In the specific design, in order to ensure that the maintenance of a single module will not affect the overall heating supply, the number of modules must meet the following conditions: the daily steam demand on the user side is Q, and the hourly steam power is P. If n is 2, then at least 2 modules are needed; if n is ≥ 2, then directly take At the same time, the energy storage capacity of a single module is calculated as Q0=90%×Q / n, to ensure that the energy storage module 50 has a certain energy storage margin while meeting the steam supply demand. In a more specific embodiment, the selected power of the heat pump device 20 is 10% of the total steam demand on the user side, that is, 10%*Q / t, where t is the number of operating hours of the heat pump device 20. Through reasonable selection, the heat pump device 20 can operate efficiently during the valley power period, prepare high-temperature water close to the saturation temperature and supply it to the energy storage module 50, effectively reducing the overall energy consumption of the system.

[0122] In the scenario of high steam demand, the energy storage module 50 can be switched to the parallel operation mode, and each module releases heat independently to form a multi-channel steam generation path to meet the rapid steam supply demand and significantly improve the steam supply response speed; in the scenario of low steam demand, the energy storage module 50 switches to the series operation mode, and the low-temperature molten salt that has released part of the heat is used to preheat other modules to maximize the utilization of the heat storage medium, thereby optimizing energy efficiency. In addition, in order to enhance operational flexibility, in the series mode, the preheating flow between the modules can be dynamically adjusted to optimize the heat distribution.

[0123] This embodiment specifically uses three parallel molten salt energy storage modules, and its operating temperature range is 180°C to 400°C (fifth temperature to fourth temperature), which is suitable for large-scale industrial steam demand. However, the configuration of the energy storage module 50 is not limited to this. In other embodiments, solid energy storage, phase change energy storage or thermochemical energy storage modules may be used as required. Different energy storage modules 50 may be the same or different, and the operating temperature may be set uniformly or in sections. For example, in a system requiring multi-stage heating, a molten salt energy storage module (high temperature section), a phase change energy storage module (medium temperature section) and a solid energy storage module (low temperature section) may be configured in combination to meet complex process requirements.

[0124] Preferably, the molten salt can be a low melting point mixed molten salt (melting point below 100°C) to reduce the system startup temperature and enhance the deep heat release capacity of the energy storage module 50. In addition, the heat storage medium can also be a high thermal conductivity solid material (such as graphite or metal aluminum) to improve the heat transfer efficiency and adapt to the high heat flux density requirements under special operating conditions. For low temperature applications, phase change energy storage materials (such as sodium hydroxide) can provide higher energy storage density while reducing the material volume and improving the compactness of the system.

[0125] In a specific embodiment, the energy storage module 50 also includes an electric heater 51, which is configured to be directly inserted from the top of the energy storage module 50, and the distance from the bottom of the module is controlled between 100 and 200 mm to balance the heating effect and the temperature control requirements of the module base. The number of electric heaters 51 is generally 5 to 6, one of which is a full-segment heater, which is used to melt solid molten salt. Its immersed part can heat up in the whole section, and the power is adjusted by a thyristor. The remaining electric heaters 51 are 2 / 3-segment heating, which only heats the lower 2 / 3 of the molten salt, and the power is not adjustable. By reasonably configuring the heating section and combining the upper hot and lower cold temperature stratification characteristics in the module, the phenomenon of overheating of the upper molten salt and insufficient heating of the lower molten salt is effectively avoided, and the uniformity of molten salt heating and the stability of system operation are improved.

[0126] When further optimized, the heat pump device 20 adopts a transcritical carbon dioxide cycle design, and realizes heat conversion from a low-temperature heat source to a high-temperature heat carrier through an efficient transcritical cycle. This design enables the outlet temperature range of the heat pump to be accurately controlled within a range close to the saturation temperature (for example, 90 to 98°C), providing high-temperature water at the optimal operating temperature for the energy storage device, significantly improving the heating efficiency of the energy storage device. The heat pump device 20 can be selected according to different heat source conditions, such as air source heat pumps, water source heat pumps, ground source heat pumps, or waste heat source heat pumps. The specific configuration can be optimized based on environmental conditions and steam demand. Furthermore, the heat pump device 20 can adopt a cascade heating design to meet higher temperature requirements.

[0127] When further optimized, the water storage device 30 is connected between the heat pump device 20 and the energy storage device, and has sealing and pressurizing functions, which is used to maintain the liquid state of high-temperature water and avoid phase change heat loss. To further optimize the system performance, when the heating capacity of the heat pump device 20 can reach 150°C, the water storage device 30 can adopt a pressurized insulated water tank design, and maintain its internal pressure at about 0.6MPa to ensure that the saturation temperature of the water reaches about 158°C. Under this pressure condition, when the heat pump device 20 heats the water to the first temperature (150°C), the water remains in liquid state and is slightly lower than the saturation temperature. This design makes full use of the heating capacity and high energy efficiency characteristics of the heat pump.

[0128] Furthermore, when a heat pump device 20 with a higher heating capacity is used (for example, heating to 180°C or higher), the internal pressure of the water storage device 30 can be increased accordingly to match the saturation temperature of the water. For example, when the target heating temperature is 180°C, the internal pressure of the water storage device 30 can be increased to about 1.0MPa, so that the saturation temperature of the water exceeds the target temperature, ensuring the stability of the liquid state. By dynamically adjusting the pressure setting of the water storage device 30, it is possible to flexibly adapt to the heating capacity and working conditions of different models of heat pumps, further improving the applicability and energy efficiency of the system.

[0129] The high-pressure insulation design of the water storage device 30 also has the following advantages: on the one hand, by maintaining a high internal pressure, the heat loss of high-temperature water is effectively reduced, ensuring its efficient transmission to the energy storage device; on the other hand, liquid high-temperature water under high pressure conditions can significantly reduce the time delay of steam supply and improve the response speed of the entire system. In addition, the water storage device 30 is combined with high-efficiency insulation materials to further reduce the heat loss during long-term storage, significantly improving the overall operating efficiency of the system.

[0130] Therefore, by combining the heating capacity of the heat pump with the design of the pressurized insulated water tank, this solution fully utilizes the high-efficiency heating characteristics of the heat pump device 20. At the same time, through the dynamic pressure regulation of the water storage device 30, it adapts to various working conditions and provides reliable guarantee for efficient and stable steam heating.

[0131] In addition, the present invention also provides a specific example to analyze the change of the overall energy efficiency of the system:

[0132] Assuming that the system heat source temperature is 10℃, the output steam temperature is 180℃, and the insulated water tank works under different temperature conditions, analyze the changes in the overall COP of the system. When the insulated water tank temperature is 95℃, the heat pump heats the water from 10℃ to 95℃, and the required heat is Q 热泵 =1×4.2×(95-10)=357kJ / kg. Assuming the COP of the heat pump is 3.0, the input power of the heat pump is W 热泵 =Q 热泵 ÷COP=357÷3.0=119kJ / kg. The energy storage device needs to heat water from 95℃ to 180℃, and the required heat is Q 储能 =1×4.2×(180-95)=357kJ / kg. Assume that the efficiency of the energy storage device is 90% and the energy storage loss is L 储能 =Q 储能 ×0.1=35.7kJ / kg. The total input power of the system is W 总＝ W 热泵 +L 储能 =119+35.7=154.7kJ / kg, the total heat output is Q 总输出 =Q 热泵 +Q 储能 =357+357=714 kJ / kg. At this time, the total COP of the system is COP 系统 =Q 总输出 ÷W 总 =714÷154.7≈0.97.

[0133] When the temperature of the insulated water tank rises to 150℃, the heat pump needs to heat the water from 10℃ to 150℃, and the required heat is Q 热泵=1×4.2×(150-10)=588kJ / kg. Assuming the heat pump COP drops to 2.2, the heat pump input power is W 热泵 =Q 热泵 ÷COP=588÷2.2=267.3kJ / kg. The energy storage device only needs to heat water from 150℃ to 180℃, and the required heat is Q 储能 =1×4.2×(180-150)=126kJ / kg, energy storage loss is L 储能 =Q 储能 ×0.1=12.6kJ / kg. The total input power of the system is W 总 =W 热泵 +L 储能 =267.3+12.6=279.9kJ / kg, the total heat output is Q 总输出 =Q 热泵 +Q 储能 =588+126=714 kJ / kg. At this time, the total COP of the system is COP 系统 =Q 总输出 ÷W 总 =714÷279.9≈1.02.

[0134] From the results, it can be seen that although the heat pump COP dropped from 3.0 to 2.2 due to the increase in outlet temperature, the total system COP increased from 0.97 to 1.02 due to the significant reduction in the burden of the energy storage device, indicating that increasing the temperature of the insulation water tank can optimize the overall efficiency of the system within a certain range. In practical applications, it is necessary to further simulate and optimize the operating temperature of the insulation water tank according to specific system parameters to achieve optimal performance.

[0135] In a further optimized embodiment, the energy storage coupled heat pump steam generation system includes a variety of pipelines and control components for achieving efficient heat transfer and flexible regulation of system operation. The pipelines and control components mainly include a first water supply pipeline, a recirculation branch 41, a desuperheating water branch 42, a second water supply pipeline, a preheating circuit, a branch pipe regulating valve group and its matching electric valve, a main pipe regulating valve group and a desuperheater 70, etc.

[0136] The first water supply pipeline connects the water storage device 30 and the energy storage module 50, and is used to transport high-temperature water to the heat exchange pipeline of the energy storage module 50. Two groups of water supply pumps are arranged in the first water supply pipeline, one for use and one for backup, and the continuity and reliability of water supply are ensured by an automatic switching mechanism. The main pipe regulating valve group is connected to the water supply pump group to adjust the flow rate of high-temperature water delivered to the energy storage module 50 to ensure that different steam load requirements are met. If the system includes multiple energy storage modules 50, the main pipe regulating valve group is connected to each module through a branch pipe regulating valve group. The branch pipe regulating valve group is used to accurately adjust the flow rate of high-temperature water entering each energy storage module 50 to ensure that each module is evenly fed with water during operation. In addition, an electric valve is arranged between each branch pipe regulating valve group and the energy storage module 50, which is used to shut down when a specific module stops running or is under maintenance.

[0137] A recirculation branch 41 is drawn from between the main pipe regulating valve group and the energy storage module 50 and connected to the water storage device 30 to realize the reflux of high-temperature water when the system is running. The recirculation branch 41 can be opened through bypass regulation when the system pressure rises rapidly, and part of the feed water is returned to the water storage device 30, thereby reducing the amount of water entering the energy storage module 50, controlling the pressure fluctuation of the system, and avoiding overpressure operation of the system.

[0138] A cooling water branch 42 is led out from between the water supply pump group and the main pipe regulating valve group in the first water supply pipeline and connected to the cooling water input port of the desuperheater 70. The cooling water transported by the branch is mixed with the high-temperature steam in the desuperheater 70 and then output to the steam main pipe on the user side to adjust the steam temperature to the third temperature required by the user. The connection method of the cooling water branch 42 ensures that the inlet pressure of the cooling water pipeline is not affected by the action of the main pipe regulating valve, ensuring that the steam temperature on the user side does not exceed the limit under any working conditions.

[0139] The second water supply pipeline connects the heat pump device 20 and the energy storage module 50, and is used to directly transport the high-temperature water generated by the heat pump device 20 to the heat exchange pipeline of the energy storage module 50. The heat pump device 20 is used to directly supply water to the energy storage device, or to supply water to the energy storage device simultaneously with the water storage device 30. It is used when the steam demand is small, for example, when the water supply flow of the heat pump device 20 meets the steam demand flow, water can be directly supplied from the heat pump device 20 to the energy storage device; or it can be used for emergency.

[0140] The desuperheater 70 is connected to the pressure stabilizing device through the steam input port, and the pressure stabilizing device is connected to the energy storage module 50, so that the energy storage module 50 supplies the first water vapor to the pressure stabilizing device, and the desuperheating water branch 42 is connected to the desuperheating water input port of the desuperheater 70. The pressure stabilizing device is preferably a steam cylinder 60, and the steam output of the energy storage module 50 is collected and merged into one path through the steam cylinder 60 and then enters the desuperheater 70, where it is fully mixed with the desuperheating water and outputs a steam temperature that meets the user's needs. The design of the desuperheater 70 can flexibly adjust the steam temperature to adapt to different user-side process requirements, ensuring the accuracy and stability of steam supply.

[0141] The preheating circuit is used to preheat the heat storage medium in the energy storage module 50 by using the heat pump device 20 during the off-peak period. The preheating circuit includes a third water supply pipeline and a preheating return water pipeline, which are respectively connected between the heat pump device 20 and the energy storage module 50 to form a closed loop to achieve efficient heating of the heat storage medium below the first temperature. Specifically, the third water supply pipeline is connected to the outlet end of the heat pump device 20, and is used to transport the high-temperature water heated by the heat pump to the heat exchange pipeline inside the energy storage module 50, and use the sensible heat of the high-temperature water to heat the heat storage medium; the preheating return water pipeline is connected to the outlet end of the heat exchange pipeline inside the energy storage module 50, and is used to return the low-temperature water after heat exchange to the inlet end of the heat pump device 20 for circulation heating. Through this preheating circuit, the heat pump can achieve graded heating at the temperature of the low-temperature heat storage medium, so that it gradually approaches the first temperature, providing a more efficient thermal state for the subsequent high-temperature water preparation and steam generation process.

[0142] Furthermore, the heat exchange pipeline of the energy storage module 50 is designed to be compatible with the operating mode of the preheating circuit. The third water supply pipeline and the preheating return water pipeline in the preheating circuit are both connected to the heat exchange pipeline inlet and outlet of the energy storage module 50, so that the third water supply pipeline, the heat exchange pipeline and the preheating return water pipeline together constitute an efficient preheating circulation loop. In addition, in order to further improve the preheating efficiency of the energy storage module 50, an independent preheating pipeline may be additionally provided inside the energy storage module 50. The third water supply pipeline and the preheating return water pipeline are respectively connected to the independent preheating pipeline to form a more specialized preheating circuit for specially handling the low-temperature preheating requirements of the heat storage medium under specific working conditions. Specifically, the preheating circuit is connected to the first heat exchange pipeline 52 and / or the second heat exchange pipeline 53, and preferably the second heat exchange pipeline 53, and the preheating pipeline is arranged on the inner cylinder wall of the energy storage module 50, preferably the outer wall of the inner cylinder is welded.

[0143] In this embodiment, the preheating circuit not only uses the heat pump to preheat the heat storage medium during the off-peak period to improve the standby efficiency of the energy storage module 50, but also significantly shortens the startup time of the system and reduces the operating load of the traditional high-energy consumption heater during the startup phase.

[0144] In a further optimized embodiment, the energy storage coupled heat pump steam generation system includes a deionized water supply device, a sewage pipe 43, and a multi-stage pressure protection and pressure relief component to ensure the stability and safety of the system operation.

[0145] The deionized water supply device includes a raw water tank 11, a water treatment device 12, a pure water tank 13 and a deionized water supply pipeline connected in sequence. In order to improve the reliability of the system operation, a tap water pipe bypass is set in front of the inlet of the pure water tank 13. When the water treatment device 12 cannot work normally, the tap water can directly enter the pure water tank 13 through the bypass as a temporary water source. Specifically, the raw water is taken out from the tap water pipeline in the factory area and first enters the raw water tank 11. The raw water tank 11 serves as a buffer device and can store about 3 to 6 hours of water consumption to cope with instantaneous water demand fluctuations. The raw water is transported to the water treatment device 12 through the raw water pump for softening and desalination. The quality of the treated deionized water should meet the through-flow boiler water quality standard in GB / T1576 "Industrial Boiler Water Quality". It is then temporarily stored in the pure water tank 13. The pure water tank 13 has a storage capacity of about 3 hours of water consumption, ensuring the continuous water supply capacity of the system when the water treatment device 12 is overhauled or shut down.

[0146] Two groups of deionized water pumps are arranged on the deionized water supply pipeline, one for use and one for standby, and the continuous supply of deionized water is ensured through the automatic switching function. The deionized water passing through the deionized water pump enters the heat pump device 20 through the regulating valve.

[0147] In other embodiments, the deionized water supply device may also supply water to the energy storage module 50 and the desuperheated water inlet respectively according to demand.

[0148] The water supply port of the energy storage module 50 is connected to the drain pipe 43, which is used to discharge the residual working fluid in the energy storage module 50 when the system is shut down or in an emergency. A drain valve is arranged near the water supply port of the drain pipe 43, which may include an electric shut-off valve and a manual shut-off valve. During normal operation, the drain valve remains closed. When the system is shut down or the system is over-pressurized, the drain valve is opened, and the residual water working fluid is pressed into the drain well by the residual pressure in the energy storage module 50, ensuring that there is no retained working fluid in the system, thereby improving the operation safety.

[0149] The steam pipeline 44 connects the energy storage module 50 and the pressure stabilizing device for conveying steam. A mechanical safety valve 81 is installed on the steam pipeline 44. When the steam pressure exceeds the set safety threshold, the mechanical safety valve 81 automatically trips to release excess steam to prevent system overpressure. After the steam is output, it is merged into the sub-cylinder 60 and connected to the desuperheater 70 through the steam main pipe. An overpressure relief valve 82 is set on the steam main pipe. When the steam pressure exceeds the second warning value, the overpressure relief valve 82 automatically opens to discharge the excess steam to a safe area.

[0150] In order to ensure the safety of the system under different operating conditions, this system is equipped with four pressure protection measures: the first warning: when the steam pressure exceeds the set threshold, the water supply main pipe regulating valve automatically adjusts the flow according to the pressure signal to control the amount of high-temperature water entering the energy storage module 50 to balance the system pressure; the second warning: when the pressure continues to rise, the overpressure relief valve 82 opens to discharge excess steam to a safe area; the third warning: if the pressure further rises to the emergency shutdown threshold, the system enters an emergency shutdown state, and the drain valve opens at the same time to quickly discharge all working fluids to the drain well to quickly reduce the system pressure; the fourth warning: in extreme overpressure conditions, the mechanical safety valve 81 automatically trips to release steam to ensure the safe operation of the system and equipment. Through the above-mentioned multi-level pressure protection design and the rapid response capability of the drain pipeline 43, the system can quickly take countermeasures in the event of sudden pressure fluctuations, significantly reducing the risk of overpressure and improving the safety and stability of operation.

[0151] In a further embodiment, the energy storage module 50 is equipped with an auxiliary heater and an emergency heating module to enhance the operational flexibility and reliability of the system. The auxiliary heater directly heats the fluid in the heat exchange pipeline, and is mainly used for rapid temperature rise during the startup phase or heat supplement during low-load operation. The emergency heating module includes an emergency heating pipeline, which can be connected in series or in parallel with the heat exchange pipeline of the energy storage module 50 to provide supplementary heating when the heat release power of the energy storage module 50 is insufficient or some modules are under maintenance. Through the above configuration, the system can achieve continuous and stable heat supply during startup, load peak or special operating conditions, significantly improving operational efficiency and safety.

[0152] The present invention also provides an energy storage coupled heat pump steam generation method, which combines the hierarchical cooperation of the heat pump device 20, the water storage device 30 and the energy storage module 50, and utilizes the efficient heating capacity of the heat pump device 20 during the off-peak period to heat the water to high-temperature water of a first temperature, and further heats the water to a first water vapor of a second temperature through the energy storage module 50, thereby meeting the steam demand on the user side. This method realizes the efficient utilization of energy and optimizes the operating economy and flexibility of the system. It should be pointed out that the following embodiments of the energy storage coupled heat pump steam generation method are suitable for operation in the aforementioned system structure, but are not limited to the aforementioned system structure.

[0153] According to a specific embodiment of the present invention, Figure 4-7 In this embodiment, the energy storage coupled heat pump steam generation method includes the following steps:

[0154] S1. The heat pump device 20 is used to heat the desalted water to a first temperature (close to the saturation temperature) of high temperature water, and the desalted water is stored in the water storage device 30 in a heat-insulated manner.

[0155] S2. During the steam supply period, the high-temperature water in the water storage device 30 is transported to the energy storage module 50 through the first water supply pipeline, and is further heated to a second temperature by the molten salt storage tank to generate first water vapor.

[0156] Furthermore, the first temperature is set according to the heating capacity of the heat pump device 20. When the heat pump device 20 has a higher heating capacity (for example, a transcritical carbon dioxide heat pump), the water can be heated to a temperature higher than 100°C. At this time, the present embodiment uses a pressurized insulated water tank to maintain the liquid state of the high-temperature water by setting a specific pressure value. At the same time, the first water supply pipeline is also matched with pressure regulation, and is used as a pressure pipeline to transport the high-temperature water between the heat pump device 20 and the water storage device 30.

[0157] Preferably, the first temperature is lower than the first temperature difference corresponding to the saturation temperature, and the range of the first temperature difference is 2 to 10°C, preferably 4 to 6°C. This can effectively avoid the vaporization phenomenon that may occur when the liquid high-temperature water approaches or exceeds the saturation temperature during the heating process, and ensure the stable liquid state of the high-temperature water in the water storage device 30 and the delivery pipeline. This not only improves the heating efficiency of the heat pump device 20 and reduces energy consumption, but also reduces heat loss and system fluctuations caused by phase change.

[0158] Furthermore, the method further comprises the following steps:

[0159] S3. Use the desuperheater 70 to mix the first water vapor at the second temperature with the high-temperature water at the first temperature to generate the second water vapor at a third temperature, wherein the third temperature is between the first temperature and the second temperature (e.g., 180-250° C.) to meet the steam use system's demand for steam at different temperatures.

[0160] This embodiment realizes hierarchical and efficient utilization of heat by organically combining the efficient heating characteristics of the heat pump device 20 and the high-density energy storage characteristics of the energy storage device. This method not only significantly improves the energy efficiency of the system and reduces energy costs, but also optimizes the operating load of the energy storage module 50 and reduces the thermal stress of the molten salt, thereby extending the service life of the equipment, improving the safety and stability of the system operation, and meeting the economy and flexibility of industrial steam demand.

[0161] In another embodiment (operation control of the energy storage device and the heat pump device 20), as Figure 5-7 , including the following specific steps:

[0162] S10, using the historical data and real-time working conditions of the steam use system, predicting the first steam demand in the steam supply period, and determining the corresponding first water vapor enthalpy increment. Based on the prediction results, providing a control basis for the operation of the energy storage device and the heat pump device 20.

[0163] S20. During the valley power period, heat is stored by the energy storage device in an electrically heated manner to heat the heat storage medium (such as molten salt) to a set fourth temperature (such as 400° C.). Preferably, the heating temperature of the heat storage medium is dynamically adjusted according to demand to ensure the economy and effectiveness of heat storage.

[0164] S30, controlling the heat pump device 20 to operate at least part of the time during the off-peak period to prepare the required high-temperature water, and heating the desalted water to a first temperature close to the saturation temperature (eg, 90°C).

[0165] S40, making the sum of the second enthalpy increment provided by the energy storage device releasing heat and the first enthalpy increment provided by the heat pump device 20 heating match the enthalpy increment of the first water vapor corresponding to the first steam demand.

[0166] Furthermore, the operation ratio of the heat pump device 20 during the off-peak period is optimized, and the specific process is as follows:

[0167] S31, obtaining the power supply capacity that can be used for steam generation during the valley power period, and determining the second power consumption required by the energy storage device during the valley power period;

[0168] S32, calculating a first difference between the valley power supply capacity and the second power consumption of the energy storage device:

[0169] If the first difference in electricity is sufficient to complete the preparation of the required total amount of high-temperature water, the heat pump device 20 completes the preparation of all high-temperature water during the valley electricity period;

[0170] If the first difference in electricity is insufficient, the heat pump device 20 uses the first difference in electricity to partially prepare high-temperature water during the off-peak period, and the rest is replenished during the normal period.

[0171] S33, calculating the first power consumption required by the heat pump device 20 to prepare all high-temperature water that meets the steam supply demand during the off-peak period. The first power consumption is a function of the operation time, power and water heating demand of the heat pump device 20, ensuring that the prepared high-temperature water can meet the first temperature demand.

[0172] S34, after deducting the second power consumption of the energy storage device from the power supply capacity during the off-peak period, calculate the remaining power (first difference power). Then calculate the difference between the first difference power and the first power consumption to obtain the second difference power. The second difference power is the remaining power of the system.

[0173] S35. Real-time monitoring of the first difference in electricity and the heating capacity of the heat pump device 20. When the first difference in electricity and the heating capacity of the heat pump device 20 exceed the demand for high-temperature water at the first temperature, the second difference in electricity is used to provide preheating heat for the energy storage device through the heat pump device 20.

[0174] Furthermore, this embodiment also includes the following steps:

[0175] S51. During the steam supply period, the high enthalpy heat provided by the energy storage device is used to further heat the high-temperature water to generate superheated steam at a second temperature for use by the user side.

[0176] S52. During the period of steam demand, when the heat release power of the energy storage device is insufficient (for example, at the end of the steam supply period), the high-temperature water in the heat exchange pipeline is quickly supplemented with heating by the configured auxiliary heater or auxiliary heating module to ensure the continuity and stability of the steam supply.

[0177] S53. During the period of steam demand, after the molten salt storage tank releases heat to the fifth temperature (for example, 200°C), if there is still a demand for steam, high-temperature water is dynamically added to the energy storage device through the heat pump device 20, and combined with the electric heating function of the energy storage module 50, the heat output is further improved; or the heat pump device 20 is used to directly heat to the target temperature to ensure the stability and continuity of the steam supply.

[0178] This embodiment uses the coordinated operation and control of the energy storage device and the heat pump device 20, combined with historical data and load prediction of real-time working conditions, to accurately match the steam supply demand, significantly improving the operating efficiency and flexibility of the system. During the off-peak period, by optimizing the operation strategy of the energy storage device and the heat pump device 20, low-cost electricity is fully utilized to heat the heat storage medium to a set high temperature state and prepare high-temperature water that meets the demand; during the steam supply period, the high enthalpy heat provided by the energy storage device and the dynamic supplement of the heat pump device 20 are used to ensure the continuity and stability of the steam supply.

[0179] This embodiment achieves the optimal allocation of power resources during the off-peak period. After the high-temperature water demand is met, the remaining power is used to preheat the energy storage device, reducing the heating burden during the steam supply period and further improving the system energy efficiency. At the same time, in the late stage of steam supply or load peak scenarios, the auxiliary heating module and the heat pump device 20 are combined with dynamic regulation to effectively avoid steam supply interruption caused by insufficient energy storage capacity.

[0180] In another embodiment (determination of energy storage capacity and heat release power of energy storage device), the following specific steps are included:

[0181] S71. Use historical data and real-time operating conditions to predict the first steam demand and maximum steam demand rate during the steam supply period, which correspond to the total heat demand and instantaneous heating capacity demand of the energy storage device, respectively. According to the steam demand characteristics, calculate the enthalpy increment of heat provided by the heat pump device 20 and the energy storage device, and determine the first ratio of the two. Preferably, the heat pump device 20 operates in the high-efficiency range, mainly providing the first enthalpy increment for preparing high-temperature water; the energy storage device assumes the heat output of high enthalpy value as the second enthalpy increment to meet the high temperature demand for steam generation.

[0182] According to the first ratio, the core parameters of the energy storage device are determined using the following steps:

[0183] S72. Determine the energy storage capacity of the energy storage device in combination with the first steam demand and the first ratio to ensure that it has sufficient heat reserve during the steam supply period. The heat storage medium is preferably molten salt, and the required mass and volume are calculated based on the operating temperature range and specific heat capacity to ensure the economy and effectiveness of heat storage.

[0184] S73. According to the maximum steam demand rate and the first ratio, the heat release power of the energy storage device is designed to match the instantaneous steam load demand. The stability and uniformity of steam output are ensured by optimizing the heat exchange pipeline and branch pipe regulating valve group.

[0185] This embodiment scientifically allocates the heat supply ratio of the heat pump device 20 and the energy storage device by predicting the steam demand and the maximum steam demand rate, and optimizes the design of the energy storage capacity and heat release power. The heat pump device 20 operates in a high energy efficiency range to prepare high-temperature water; the energy storage device provides high enthalpy heat to meet instantaneous load requirements. This method realizes the hierarchical utilization and precise matching of thermal energy, reduces operating costs, enhances the system's adaptability to load fluctuations, and provides an efficient and stable steam heating solution.

[0186] In another embodiment (energy storage module 50 deep heat release), combined with reference Figure 8 This embodiment describes a steam generation method based on deep heat release of the energy storage module 50, which realizes efficient utilization and deep heat release of the energy storage device through step-by-step heat release of multiple temperature sections and the coordinated work of the heat pump device 20, and specifically includes the following steps:

[0187] S110, during the valley electricity period, the low melting point molten salt having an initial temperature of the eighth temperature (such as 40° C.) is heated to the first temperature (such as 90° C.) by the heat pump device 20. This process makes full use of the low cost valley electricity and the efficient heating capacity of the heat pump to provide a basic heat reserve for subsequent molten salt electric heating.

[0188] S120, during valley power period or flat power low load period, the molten salt is heated from the first temperature to a fourth temperature (eg, 400° C.) by the electric heater 51. This step lays the foundation for the high enthalpy output of the energy storage module 50, ensuring sufficient heat reserve during the steam supply period.

[0189] S130, during the steam demand period, the molten salt of part of the energy storage module 50 is released from the fourth temperature to the fifth temperature (such as 200°C), and superheated steam of the second temperature (such as 180-370°C) is generated through the heat exchange pipeline. In this stage, a multi-channel steam generation path with a parallel structure is used to meet the set steam demand flow.

[0190] S140, when the molten salt of some energy storage modules 50 releases heat to the fifth temperature, by switching the heat exchange pipeline to the series mode, these modules provide high-temperature water preheating for the energy storage modules 50 that are still in a high-temperature state (fourth temperature), and further release heat to the sixth temperature (such as 120° C.). This step optimizes the energy utilization efficiency of the high-temperature section molten salt and realizes the gradient cooperative heat release of the energy storage modules 50.

[0191] S150, after the molten salt releases heat to the sixth temperature, the low-temperature water is heated to the first temperature (such as 90°C) and stored by adjusting the flow of the heat exchange pipeline. This stage adopts a low-flow operation mode to maximize heat recovery and further release heat to the seventh temperature (such as 100°C) of the molten salt.

[0192] S160, the molten salt that releases heat to the seventh temperature is used to provide hot water to the water source heat pump, and the water source heat pump further heats the hot water to the first temperature (such as 90° C.) and stores it. This step releases heat to the eighth temperature (such as 40° C.) through the efficient energy recovery of the heat pump device 20, completing the deep heat release cycle of the energy storage module 50.

[0193] S170: When the molten salt of all energy storage modules 50 releases heat to the eighth temperature, restart step S110, preheat the molten salt through the heat pump device 20, and enter the next cycle. At the same time, dynamically adjust the heat release mode (parallel or series) and operating parameters of the energy storage module 50 to meet the real-time steam demand of the user side.

[0194] Preferably, in step S140, the fifth temperature is higher than the second temperature by a second temperature difference, and the second temperature difference ranges from 20 to 50°C; the sixth temperature is higher than the first temperature by a third temperature difference, and the third temperature difference ranges from 10 to 30°C; the fourth temperature is higher than the sixth temperature by a fourth temperature difference, and the fourth temperature difference is greater than the sum of the second temperature difference and the third temperature difference.

[0195] This embodiment achieves deep utilization of the energy storage module 50 by releasing heat in stages and step by step. The switching between parallel and series modes optimizes the collaborative efficiency of the energy storage module 50 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 heat pump device 20, low-cost valley electricity and low-temperature waste energy are fully utilized, the operating cost is reduced, the economy and environmental adaptability of the system are enhanced, and an efficient and stable solution is provided for industrial steam use under complex working conditions.

[0196] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and various implementation steps can be combined, which all belong to the protection scope of the present invention; therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for generating steam by coupling a heat pump with energy storage, characterized in that: The following steps are involved: Using a heat pump device to heat water to a first temperature, the first temperature being a high-temperature water temperature close to a saturation temperature; The high-temperature water is further heated from the first temperature to a second temperature using an energy storage device, wherein the second temperature corresponds to the temperature of the first water vapor.

2. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The following steps are also included: The high-temperature water generated by the heat pump device and close to its maximum heating temperature is transported to a water storage device, wherein the first temperature of the high-temperature water includes a temperature range higher than 100° C. The water storage device has sealing and pressurizing functions for maintaining the high-temperature water in a liquid state; The high temperature water is stably delivered from the water storage device to the energy storage device to be further heated to a second temperature to generate superheated steam.

3. The energy storage coupled heat pump steam generation method according to claim 1 or 2, characterized in that: The first temperature is lower than the saturation temperature at the corresponding pressure, and the temperature difference ranges from 2 to 10°C.

4. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The following steps are also included: The first water vapor at the second temperature is mixed with the high-temperature water at the first temperature by using a desuperheater to generate the second water vapor at the third temperature, wherein the third temperature is between the first temperature and the second temperature to meet the demand of the steam using system for steam at different temperatures.

5. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The following steps are also included: Predicting the first steam demand of the steam-using system during the steam supply period; During off-peak hours, heat is stored in an energy storage device as electrical heating; Controlling the heat pump device to operate at least part of the time during a valley power period to prepare high-temperature water at a first temperature; The sum of the second enthalpy increment provided by the energy storage device releasing heat and the first enthalpy increment provided by the heat pump device heating is made to match the enthalpy increment of the first water vapor corresponding to the first steam demand.

6. The energy storage coupled heat pump steam generation method according to claim 5, characterized in that: The proportion of the heat pump device operating during the off-peak period is determined by the following steps: Obtaining power supply capacity that can be used for steam generation during off-peak hours; Calculate the second power consumption required by the energy storage device during the off-peak period; Calculating a first difference in power between the power supply capacity and the second power consumption; When the first difference in electricity is sufficient to complete the preparation of the high-temperature water, the heat pump device completes the preparation of all high-temperature water during the valley electricity period; When the first difference in electricity is insufficient to complete the preparation of the high-temperature water, the heat pump device uses the first difference in electricity to complete part of the preparation of the high-temperature water, and the remaining preparation is completed by the heat pump device outside the valley electricity period.

7. The energy storage coupled heat pump steam generation method according to claim 6, characterized in that: The following steps are also included: Calculate the first power consumption required by the heat pump device to prepare all high-temperature water; Calculating a second difference in power between the first difference in power and the first power consumption; When the first difference in electricity and the heating capacity of the heat pump device exceed the heating demand of high-temperature water at the first temperature, the second difference in electricity is used to provide preheating heat for the energy storage device through the heat pump device.

8. The energy storage coupled heat pump steam generation method according to claim 5, characterized in that: During the steam supply period, when the actual steam demand exceeds the first steam demand, additional high-temperature water is prepared by the heat pump device, and supplementary electric heating is performed by the energy storage device.

9. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The energy storage device includes a plurality of energy storage modules, and the heat exchange pipelines of the plurality of energy storage modules are configured to be connected in parallel between any two energy storage modules through switching operations to form multiple steam generation paths, or connected in series to form a single steam generation path.

10. The energy storage coupled heat pump steam generation method according to claim 9, characterized in that: During the steam supply period, the multiple energy storage modules of the energy storage device release heat through the following steps: Connecting the heat exchange pipelines of the plurality of energy storage modules to a parallel structure to form a multi-channel steam generation path, so that the heat storage medium of some energy storage modules releases heat from the fourth temperature to the fifth temperature to generate superheated steam at the second temperature; Switch the heat exchange pipelines to be connected in series, so that the energy storage module that has released heat to the fifth temperature provides high-temperature water preheating for the energy storage module with a higher temperature, and at the same time, its heat storage medium further releases heat to the sixth temperature; and / or adjusting the heat exchange pipeline of the energy storage module to generate high-temperature water at the first temperature by heating deionized water and storing the water, so that the heat storage medium further releases heat to the seventh temperature; And / or adjust the heat exchange pipeline of the energy storage module to generate hot water for heating by heating deionized water, so that the heat storage medium further releases heat to the eighth temperature.

11. The energy storage coupled heat pump steam generation method according to claim 10, characterized in that: The fifth temperature is higher than the second temperature by a second temperature difference, and the second temperature difference ranges from 20 to 50° C.; the sixth temperature is higher than the first temperature by a third temperature difference, and the third temperature difference ranges from 10 to 30° C.; the fourth temperature is higher than the sixth temperature by a fourth temperature difference, and the fourth temperature difference is greater than the sum of the second temperature difference and the third temperature difference; and / or, The seventh temperature is higher than the first temperature by a fifth temperature difference, and the fifth temperature difference ranges from 2 to 10° C.; and / or, The eighth temperature is lower than the first temperature.

12. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The energy storage device includes an auxiliary heater for supplementary heating of the high-temperature water; or, When the heat release power of the energy storage device is insufficient, auxiliary heating is performed through the auxiliary heating module to heat the high-temperature water into first water vapor at a second temperature.

13. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The energy storage capacity and heat release power of the energy storage device are determined by the following steps: Predict the first steam demand and maximum steam demand rate during the steam supply period; Determining a first ratio between a first enthalpy increment provided by the heat pump device and a second enthalpy increment provided by the energy storage device; determining the energy storage capacity according to the first enthalpy increment; The heat release power is determined according to the maximum steam demand rate and the first ratio.

14. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: The heat pump device comprises one or more of a waste heat source heat pump, an air source heat pump, a water source heat pump, and a ground source heat pump, and the heat pump device uses carbon dioxide as a circulating working fluid and operates in a transcritical cycle state; and / or, The heat pump device is configured to operate by cascade heating; and / or, The heat storage medium of the energy storage device is a low-melting-point mixed molten salt, and its melting point is lower than 100°C.

15. The energy storage coupled heat pump steam generation method according to claim 1, characterized in that: A day includes at least one energy storage period and one steam supply period that does not completely overlap; During the energy storage period, the heat storage medium in the energy storage device is heated by electric heating to store energy; During the steam supply period, the heat released by the heat storage medium is used to heat the high-temperature water at the first temperature to the second temperature, thereby generating the first water vapor.

16. An energy storage coupled heat pump steam generation system, characterized in that: include: A heat pump device, for heating water to a first temperature, wherein the first temperature is a high-temperature water temperature close to a saturation temperature; The energy storage device includes at least one energy storage module, which is filled with a heat storage medium and equipped with a heat exchange pipeline. The heat exchange pipeline is used to receive high-temperature water at the first temperature and further heat it to a second temperature through the heat storage medium to generate first water vapor.

17. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: Also includes: A water storage device, fluidically connected to the heat pump device, for heat preservation and storage of high-temperature water heated to a first temperature by the heat pump device; A first water supply pipeline, connected to the water storage device and the energy storage module, for conveying high-temperature water in the water storage device to the heat exchange pipeline; a voltage stabilizing device, connected to the energy storage module, so that the energy storage module supplies the first water vapor to the voltage stabilizing device; The desuperheater comprises a steam input port and a desuperheating water input port, wherein the steam input port is connected to the pressure stabilizing device, and the desuperheater is connected to the first water supply pipeline. The desuperheater mixes the water vapor input from the steam input port and the desuperheating water input from the desuperheating water input port, and then outputs second water vapor at a third temperature, wherein the third temperature is lower than the second temperature.

18. The energy storage coupled heat pump steam generation system according to claim 17, characterized in that: The water storage device has sealing and pressurizing functions and is used to maintain high-temperature water above 100° C. in a liquid state.

19. The energy storage coupled heat pump steam generation system according to claim 17, characterized in that: The first water supply pipeline comprises: The water supply pump group and the main pipe regulating valve group are connected in series to the energy storage module; The desuperheating water branch is led out from between the water supply pump group and the main pipe regulating valve group and connected to the desuperheating water input port; The recirculation branch is led out from between the main pipe regulating valve group and the energy storage module and connected to the water storage device, so as to realize the reflux of high-temperature water when the system is running.

20. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: The heat exchange pipelines of the plurality of energy storage modules are configured to be connected in parallel between any two energy storage modules through switching operations to form multiple steam generation paths, or connected in series to form a single steam generation path.

21. The energy storage coupled heat pump steam generation system according to claim 17, characterized in that: Also includes a deionized water supply device, The deionized water supply device is suitable for supplying deionized water to the heat pump device, and / or the energy storage module, and / or the desuperheating water input port.

22. The energy storage coupled heat pump steam generation system according to claim 16 or 17, characterized in that: Also includes a second water supply pipeline, The second water supply pipeline is connected to the heat pump device and the energy storage module, and is used to transport the high-temperature water generated by the heat pump device to the heat exchange pipeline.

23. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: It also includes a preheating circuit, which includes a third water supply pipeline and a preheating return water pipeline. The third water supply pipeline and the preheating return water pipeline are both connected between the heat pump device and the energy storage module to form a circuit for enabling the heat pump device to heat a heat storage medium below the first temperature.

24. The energy storage coupled heat pump steam generation system according to claim 23, characterized in that: The third water supply pipeline and the preheating return water pipeline are both connected to the heat exchange pipeline, so that the third water supply pipeline, the heat exchange pipeline, and the preheating return water pipeline are suitable for forming the preheating circuit; And / or, the energy storage module is further provided with a preheating pipeline, and the third water supply pipeline and the preheating return water pipeline are both connected to the preheating pipeline, so that the third water supply pipeline, the preheating pipeline, and the preheating return water pipeline are suitable for forming the preheating circuit.

25. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: The energy storage module includes an outer tube and an inner tube, the inner tube is arranged inside the outer tube, the heat storage medium is arranged between the outer tube and the inner tube, and the heat exchange pipeline includes a first heat exchange pipeline arranged in the outer tube and a second heat exchange pipeline arranged in the inner tube.

26. The energy storage coupled heat pump steam generation system according to claim 25, characterized in that: The first heat exchange pipeline is a heat exchange coil welded to the inner wall of the outer tube, and the second heat exchange pipeline is a heat exchange coil welded to the outer wall of the inner tube.

27. The energy storage coupled heat pump steam generation system according to claim 25, characterized in that: The second heat exchange pipeline is also used for preheating the heat storage medium whose temperature is lower than the first temperature.

28. The energy storage coupled heat pump steam generation system according to claim 17, characterized in that: Also includes: Steam pipeline, connecting the energy storage module and the pressure stabilizing device, with a mechanical safety valve on the steam pipeline; The steam main pipe is connected to the steam outlet of the desuperheater and is provided with an overpressure relief valve; A sewage pipeline is connected to the water supply port of the energy storage module and communicated to the sewage well. A sewage valve is installed on the sewage pipeline.

29. The energy storage coupled heat pump steam generation system according to claim 19, characterized in that: When a plurality of energy storage modules are included, a branch pipe regulating valve group is also included. The branch pipe regulating valve group is arranged between the main pipe regulating valve group and each energy storage module, and is used to adjust the high-temperature water flow entering each energy storage module.

30. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: The heat storage medium includes at least one of a molten salt heat storage medium, a solid heat storage medium, a thermochemical heat storage medium, and a phase change heat storage medium; and / or, The heat pump device comprises one or more of a waste heat source heat pump, an air source heat pump, a water source heat pump, and a ground source heat pump, and the heat pump device uses carbon dioxide as a circulating working fluid and operates in a transcritical cycle state; and / or, The heat pump device is configured to operate by cascade heating.

31. The energy storage coupled heat pump steam generation system according to claim 16, characterized in that: The energy storage module further includes an auxiliary heater, which is suitable for heating the fluid in the heat exchange pipeline; or, The steam generation system further includes an emergency heating module, which includes an emergency heating pipeline. The emergency heating pipeline and the heat exchange pipeline are connected in series or in parallel for auxiliary heating when the heat release power of the energy storage module is insufficient.

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