Energy storage coupled heat pump steam generation method and system

Abstract

The application provides a kind of energy storage coupling heat pump steam generation method and system, adopt the way of heat pump device and energy storage device collaborative operation, realize efficient, economic steam supply.This method includes using heat pump device to prepare high temperature water in valley electricity period and store, through energy storage device to further heat high temperature water to generate superheated steam for user use.Energy storage device includes multiple energy storage modules, its heat exchange pipeline can be converted between parallel and series mode by switching, realize depth heat release and flexible control.Method dynamically adjusts the energy storage capacity and heat release power of energy storage module, combines load prediction to optimize the enthalpy increment distribution of heat pump and energy storage device, to ensure to meet diversified steam demand.At the same time, through heat pump device to preheat or dynamically supplement energy storage module, realize waste heat recovery, improve energy efficiency.The application significantly reduces operating cost, enhances the ability of system to adapt to load fluctuation, is suitable for industrial steam scene, has the characteristics of high efficiency, stability and flexibility.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy utilization and energy storage, and relates to a method and system for steam generation coupled with energy storage and heat pump, in particular, a comprehensive system and operation method for efficiently preparing high-temperature water by using a heat pump and further heating the high-temperature water into steam by an energy storage module. BACKGROUND

[0002] With the promotion of energy-saving and emission-reducing policies, there is an increasing demand for efficient and clean steam heating systems in industrial production. 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 the condition of peak-valley electricity price, the valley electricity is not fully utilized for energy storage, which also increases the operating cost of the system.

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

[0004] The present application provides a method and system for steam generation coupled with energy storage and heat pump, which organically combines the efficient heating characteristics of heat pump devices and the high-density energy storage characteristics of energy storage devices, achieving efficient utilization of energy and flexible satisfaction of heating demand. The present application utilizes heat pump devices to heat water from room temperature to high-temperature water close to saturation temperature during valley electricity period, and stores it in a water storage device, then further heats the high-temperature water to the target steam temperature by using molten salt or other efficient heat storage medium through the energy storage device, thereby meeting the steam demand. In this process, the system realizes the hierarchical efficient utilization of energy, significantly reduces the equipment size 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 releases low-grade heat to further improve the overall efficiency. In addition, the coordinated operation mode of heat pump and energy storage device can be dynamically adjusted according to electricity price and steam demand, flexibly realizing time peak-shifting, and optimizing the economy and operational reliability of the system. The overall scheme realizes the balance of energy efficiency, cost and applicability through modular design and dynamic control, and can be widely applied to industrial heating scenarios to meet the actual needs of energy-saving and emission-reducing.

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

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

[0007] further heating the high temperature water from the first temperature to a second temperature by an energy storage device, the second temperature corresponding to a temperature of first water vapor.

[0008] In some embodiments, the method further comprises the steps of:

[0009] delivering the high temperature water close to a maximum heating temperature of the heat pump device to a water storage device, the first temperature of the high temperature water including a temperature range above 100℃, the water storage device having a sealing and pressurizing function for maintaining a liquid state of the high temperature water;

[0010] stably delivering the high temperature water from the water storage device to the energy storage device for further heating to the second temperature to generate superheated steam.

[0011] In some embodiments, the first temperature is lower than a saturation temperature at a corresponding pressure, and a temperature difference range is 2-10℃, preferably 4-6℃.

[0012] In some embodiments, the method further comprises the steps of:

[0013] mixing the first water vapor at the second temperature with the high temperature water at the first temperature by a desuperheater to generate second water vapor at a third temperature, the third temperature being between the first temperature and the second temperature, for satisfying a demand of different temperature steam by a steam using system.

[0014] In some embodiments, the method further comprises the steps of:

[0015] predicting a first steam demand of the steam using system during a steam supply period;

[0016] storing heat by the energy storage device in an electric heating mode during a valley electricity period;

[0017] controlling the heat pump device to operate at least partially during the valley electricity period to prepare the high temperature water at the first temperature;

[0018] matching a sum of a second enthalpy increment provided by heat release of the energy storage device and a first enthalpy increment provided by heating of the heat pump device to an enthalpy increment of the first water vapor corresponding to the first steam demand.

[0019] In some embodiments, a proportion of the heat pump device operating during the valley electricity period is determined by the steps of:

[0020] obtaining a power supply capacity available for steam generation during the valley electricity period;

[0021] calculating a second electricity consumption required by the energy storage device during the valley electricity period;

[0022] calculating a first difference electricity between the electricity supply capacity and the second electricity consumption;

[0023] when the first difference 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 electricity is insufficient to complete the preparation of the high-temperature water, the heat pump device uses the first difference 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] In some technical solutions, the following steps are further included:

[0026] calculating a first electricity consumption required by the heat pump device to prepare all high-temperature water;

[0027] calculating a second difference electricity between the first difference electricity and the first electricity consumption;

[0028] when the first difference electricity and the heating capacity of the heat pump device exceed the heating demand of the high-temperature water of the first temperature, using the second difference electricity to provide preheating heat for the energy storage device by 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 the heat pump device, and supplementary electric heating is performed by the energy storage device.

[0030] In some technical solutions, 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 to form a plurality of steam generation paths or connected in series to form a single steam generation path through switching operation.

[0031] In some technical solutions, during the steam supply period, the plurality of 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 into a parallel structure to form a plurality of steam generation paths, so that the heat storage medium of part of the energy storage modules is cooled from the fourth temperature to the fifth temperature to generate superheated steam of the second temperature;

[0033] switching the heat exchange pipelines to series connection, so that the energy storage module that has been cooled to the fifth temperature provides high-temperature water preheating for the energy storage module with higher temperature, and the heat storage medium of the energy storage module is further cooled to the sixth temperature;

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

[0035] and / or adjusting the heat exchange pipeline of the energy storage module, generating hot water for heating by heating the deionized water, so that the heat storage medium is further discharged to the eighth temperature.

[0036] In some technical solutions, the fifth temperature is higher than the second temperature by a second temperature difference, the second temperature difference ranges from 20 to 50℃; the sixth temperature is higher than the first temperature by a third temperature difference, the third temperature difference ranges from 10 to 30℃; the fourth temperature is higher than the sixth temperature by a fourth temperature difference, 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℃, preferably from 4 to 6℃; 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 supplementally heating the fluid in the heat exchange pipeline; or,

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

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

[0042] Predicting the first steam demand and the maximum steam demand rate in the steam supply period;

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

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

[0045] Determining the heat release power 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, the heat pump device uses carbon dioxide as a circulating working medium 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 mixed molten salt with a melting point lower than 100°C.

[0049] In some technical solutions, at least one energy storage period and one steam supply period that does not completely overlap are included in one day.

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

[0051] In the steam supply period, the high-temperature water at the first temperature is heated to the second temperature by the heat released by the heat storage medium to generate the first water vapor.

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

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

[0054] An energy storage device comprising at least one energy storage module filled with a heat storage medium and equipped with a heat exchange pipeline for receiving high-temperature water at the first temperature and further heating to a second temperature by the heat storage medium to generate the first water vapor.

[0055] As a preferred solution, further comprising:

[0056] A water storage device in fluid connection with the heat pump device for heat-insulated storage of high-temperature water heated to the first temperature by the heat pump device;

[0057] A first feedwater pipeline connecting 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 pressure stabilizing device connected to the energy storage module, so that the energy storage module supplies the first water vapor to the pressure stabilizing device;

[0059] A desuperheater comprising a steam input port connected to the pressure stabilizing device and a desuperheating water input port connected to the first feedwater pipeline, the desuperheater mixing the water vapor input from the steam input port and the desuperheating water input from the desuperheating water input port and outputting the second water vapor at a third temperature, the third temperature being lower than the second temperature.

[0060] As a preferred solution, the water storage device has a sealing and pressurizing function for maintaining high-temperature water higher than 100°C in a liquid state.

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

[0062] A feedwater pump group and a mother pipe valve group connected in series to the energy storage module.

[0063] a desuperheating water branch, leading from between the feed water pump group and the header valve group and connected to a desuperheating water input;

[0064] a recirculation branch, leading from between the header valve group and the energy storage module and connected to a water storage device, for recirculation of high temperature water when the system is in operation.

[0065] As a preferred solution, the heat exchange pipelines of the plurality of energy storage modules are configured to be connected in parallel between any two energy storage modules to form multiple steam generation passages, or connected in series to form a single steam generation passage, by switching operation.

[0066] As a preferred solution, a deionized water supply device is further included,

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

[0068] As a preferred solution, a second feed water pipeline is further included,

[0069] The second feed water pipeline connects the heat pump device and the energy storage module, for transporting high temperature water generated by the heat pump device to the heat exchange pipelines.

[0070] As a preferred solution, a preheating loop is further included, the preheating loop comprising a third feed water pipeline and a preheating return water pipeline, both of which are connected between the heat pump device and the energy storage module to form a loop, for heating the heat storage medium below the first temperature by the heat pump device.

[0071] As a preferred solution, the third feed water pipeline and the preheating return water pipeline are both connected to the heat exchange pipelines, so that the third feed water pipeline, the heat exchange pipelines, and the preheating return water pipeline are adapted to constitute the preheating loop.

[0072] And / or, the energy storage module is further provided with a preheating pipeline, the third feed water pipeline and the preheating return water pipeline are both connected to the preheating pipeline, so that the third feed water pipeline, the preheating pipeline, and the preheating return water pipeline are adapted to constitute the preheating loop.

[0073] As a preferred solution, the energy storage module comprises an outer cylinder and an inner cylinder, the inner cylinder is arranged in the outer cylinder, the heat storage medium is arranged between the outer cylinder and the inner cylinder, and the heat exchange pipelines comprise a first heat exchange pipeline arranged in the outer cylinder and a second heat exchange pipeline arranged in the inner cylinder.

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

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

[0076] As a preferred solution, the system further comprises:

[0077] A steam pipeline is connected to the energy storage module and the pressure stabilizing device, and a mechanical safety valve is arranged on the steam pipeline.

[0078] A steam main pipe is connected to the steam outlet of the desuperheater, and an overpressure relief valve is arranged on the steam main pipe.

[0079] A blowdown pipeline is connected to the feedwater inlet of the energy storage module and is communicated to a blowdown well, and a blowdown valve is arranged on the blowdown pipeline.

[0080] As a preferred solution, when a plurality of energy storage modules are included, a branch valve group is further included, which is arranged between the main valve group and each energy storage module and is used to adjust the flow of high-temperature water into each energy storage module.

[0081] As a preferred solution, 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 adopts carbon dioxide as a circulating working medium and operates in a transcritical cycle state; and / or,

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

[0084] As a preferred solution, the energy storage module further comprises an auxiliary heater adapted to heat the fluid in the heat exchange pipeline; or,

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

[0086] The above technical solution has at least the following beneficial effects:

[0087] 1. The present application combines the high-efficiency heating characteristics of heat pump devices and the high-density energy storage characteristics of energy storage devices, fully utilizes the high-energy efficiency advantage of heat pumps in low temperature rise conditions, heats water to high temperature water close to saturation temperature, and then uses high-density heat storage medium to further heat the high temperature water to the target steam temperature, realizing the staged utilization and efficient conversion of energy. This design not only significantly reduces the heat required to be provided by the energy storage device, thereby reducing the size 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 temperature difference between the heat storage medium and water, and reduces the system thermal stress, which plays an important role in improving the operation stability and equipment service life of the energy storage device. Through the collaborative operation of heat pumps and energy storage devices, the present application realizes an efficient, economical and flexible steam generation process, meeting the diversified needs of industrial production.

[0088] 2. The present application heats water to high temperature water close to saturation temperature by heat pump device, and delivers it to the water storage device with sealing and pressurization function, which can store high temperature water without phase change, significantly reducing the safety risk and heat loss caused by high temperature and high pressure of the steam generation system. In addition, since the water storage device maintains the liquid state of high temperature water, it ensures the efficiency and uniformity of subsequent stable supply of high temperature water to the energy storage device. Further, by setting an accurate temperature difference range (such as 2 to 10℃) between high temperature water and saturation temperature, the operating load of the heat pump is optimized, avoiding the decline of heat pump energy efficiency caused by overheating, and providing the energy storage device with high temperature water at the optimal temperature. 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, improving the safety of system operation and the service life of the energy storage module. Through the collaborative optimization of heat pumps and energy storage devices, the present application realizes an efficient, stable and safe steam generation process.

[0089] 3. The present application realizes the time peak-shaving of heat supply demand and power consumption through the flexible combined operation of heat pumps and energy storage devices. In the valley electricity period, the heat pump is concentrated to prepare high temperature water and store it; in the flat or peak electricity period, the energy storage device releases heat to meet the steam demand. This design reduces the direct demand for electricity during peak hours, significantly reducing operating costs. At the same time, the system supports dynamic adjustment of operation mode according to real-time electricity price, transformer capacity and load demand, adapts to various steam demand, and further improves the economy.

[0090] 4. The present application 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 the off-peak electricity period, the energy storage device is preferentially operated for energy storage, and the heat pump part load is moved to the flat electricity period for operation; when the waste heat resource is sufficient, the heat pump can also be used to preheat the energy storage device, further optimizing the resource utilization efficiency; through the real-time data-driven dynamic adjustment strategy, the optimization of energy use is realized.

[0091] 5. The present application proposes that the heat exchange pipeline of the energy storage module can realize parallel or series switching, which can not only provide rapid heating through multi-parallel mode in high steam demand, but also realize deep heat release of molten salt through series mode in low demand, maximizing the utilization efficiency of heat storage medium; further, the heat distribution strategy of the energy storage module in different heat release stages is clear, through adjusting the heat exchange pipeline, not only the target steam temperature can be generated, but also the low-temperature heat storage medium can be used for preheating or generating high-temperature water, effectively prolonging 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, prolonging the service life of the equipment.

[0092] 6. The energy storage device of the present application supports multiple heat storage media, including molten salt, solid energy storage, phase change energy storage and thermochemical energy storage, which can be flexibly configured according to different heat storage requirements; at the same time, the heat pump device can select waste heat source heat pump, air source heat pump, ground source heat pump and other types, which can adapt to various industrial steam scenes; preferably, the present application can use transcritical carbon dioxide heat pump, which realizes efficient conversion from low-temperature heat source to high-temperature heat carrier through efficient transcritical cycle, especially suitable for scenes that need to prepare high-temperature water close to saturation temperature; in addition, the heat pump can further improve the outlet temperature range through cascade heating, meeting the high-temperature demand. The heat storage medium is preferably a low-melting-point mixed molten salt (melting point below 100℃), which not only reduces the start-up 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 expand the application range of the system, and through the optimal operation configuration for different environmental conditions and production demands, the overall energy efficiency and economy of the system are effectively improved, meeting the complex demands of industrial steam.

[0093] 7. The desuperheating water of the present application is prepared from high-temperature water and supplied to the inlet of the desuperheater by precisely controlling the flow rate and temperature, which can flexibly adjust the output steam temperature in industrial scenarios with diverse steam demands, meeting the needs of different processes for steam parameters. The introduction of desuperheating water also effectively reduces the thermal stress of steam pipelines and downstream equipment, prolonging the service life of the equipment. In addition, the use of desuperheating water significantly reduces the energy consumption of direct superheated steam generation, avoiding the waste of excessive heating of steam. The mechanism is that the sensible heat exchange between desuperheating water and steam can quickly balance the steam temperature, and due to the high specific heat of water, a larger temperature adjustment range can be achieved with less flow rate. Through precise control of the desuperheater, the present application not only improves the flexibility and stability of steam supply, but also optimizes the system energy efficiency, reduces operating costs, and adapts to the diversified steam demands in industrial production.

[0094] 8. The molten salt storage tank of the present application 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, which can be arranged as multiple concentric circles or independently distributed, and its interior can be filled with different types of molten salt or solid heat exchange materials, or even hollow heat exchange. The outer cylinder heat exchange coil is mainly used for rapid transfer of high-temperature heat, and the inner cylinder heat exchange coil not only realizes deep heat release of molten salt, but also preheats the molten salt using a heat pump during off-peak hours, effectively reducing the system startup time. This structure enhances the uniformity of heat distribution of molten salt, avoids excessive temperature difference, and improves the heat release power and energy efficiency of the storage tank. At the same time, the flexibility of the inner cylinder structure improves the ability of the storage tank to adapt to different heat demands and operating scenarios, making the system run more efficiently, stably and flexibly.

[0095] 9. The branch valve group of the present application is used to accurately adjust the water flow into each energy storage module, making the heat release process of the energy storage module uniform and avoiding local overheating or heat release efficiency reduction caused by uneven flow. In addition, when the steam pressure fluctuates, the system adjusts the flow through the feedwater main valve to stabilize the pressure, ensuring the stability of steam supply. This flow regulation mechanism not only improves the energy efficiency of the energy storage module, but also enhances the flexibility and reliability of the system, effectively adapting to different load demands and operating conditions.

[0096] 10. This invention significantly improves the safety and stability of system operation through a four-level pressure warning design. When steam pressure fluctuates, the first warning responds quickly to stabilize the pressure by adjusting the feedwater header valve group and recirculation pipeline; the second warning relieves pressure by opening the overpressure relief valve after the desuperheater to vent steam into the air; in the third warning, the system enters an emergency shutdown state, and simultaneously discharges the working fluid in the energy storage module through the drain pipeline to rapidly reduce pressure; the fourth warning ensures the protection of the system and equipment from damage in extreme situations through the automatic activation of the mechanical safety valve. This multi-level pressure warning mechanism, with its progressive steps, achieves precise pressure regulation control and provides multiple safety guarantees for system operation, significantly reducing the risks caused by overpressure and extending the service life of the equipment. Attached Figure Description

[0097] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings and their markings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0098] Figure 1 This is a schematic diagram of the structure 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 diagram of the structure of an energy storage module according to an embodiment of the present invention;

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

[0101] Figure 4 This is a flowchart of a method for generating steam using an energy storage coupled heat pump according to an embodiment of the present invention;

[0102] Figure 5 This is a flowchart of a typical charge-discharge heat cycle of an energy storage module according to an embodiment of the present invention;

[0103] Figure 6 This is a flowchart of a method for generating steam using an energy storage coupled heat pump according to an embodiment of the present invention;

[0104] Figure 7 This is a flowchart of a steam generation process according to an embodiment of the present invention;

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

[0106] The meanings of the symbols marked 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 - letdown water branch, 43 - blowdown line, 44 - steam line, 50 - energy storage module, 51 - electric heater, 52 - first heat exchange line, 53 - second heat exchange line, 60 - cylinder, 70 - letdown device, 81 - mechanical safety valve, 82 - overpressure relief valve. DETAILED DESCRIPTION

[0108] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0109] In order to make the drawing simple, only the parts related to the invention are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is marked. In this paper, "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 present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0111] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0113] In the traditional steam generation system, the heat pump device 20 is mainly used for the preliminary heating of low-temperature water, and the energy storage device undertakes the main heat demand from preliminary 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 are not fully utilized. The heat pump device 20 shows higher performance coefficient (COP) in low-temperature rise working conditions, but due to the failure to optimize its working range, part of the high-efficiency heat is not effectively utilized, resulting in energy waste in the preliminary heating stage. On the other hand, the energy storage device needs to undertake the heating task of a large temperature rise, and its heat storage medium needs to handle a large temperature difference, which not only increases the thermal stress of the medium, but also increases 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 insufficient research on the cooperation of the heat pump device 20 and the energy storage system. In the traditional system design, the heat pump device 20 and the energy storage device are often regarded as independent subsystems, lacking the design concept of collaborative 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, so that the efficient coupling utilization of energy cannot be realized.

[0115] Further analysis shows that the traditional design fails to fully utilize the valley electricity operation advantage of the heat pump device 20. The heat pump device 20 can significantly reduce heating costs by running in the valley electricity period of low electricity price, but due to the lack of targeted strategies, the running efficiency of the heat pump device 20 in the valley electricity period is limited, and it cannot meet the demand of efficiently preparing high-temperature water close to 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 does not reach the optimal state, thereby increasing the operating cost and carbon emissions.

[0116] In summary, fully utilizing the high energy efficiency characteristics of the heat pump device 20 to realize seamless coupling of its heating range and energy storage range is an important direction to improve system energy efficiency and economy. The present application realizes efficient high-temperature water preparation in the valley electricity period through the collaborative optimization design of the heat pump device 20 and the energy storage device, and further heating through the energy storage device, realizing the staged utilization of energy and solving the above problems existing in the traditional system.

[0117] As Figure 1, the energy storage coupled heat pump steam generation system of an embodiment of the present application is shown, which comprises a heat pump device 20, a water storage device 30, an energy storage device and various pipelines and control components connected thereto. The heat pump device 20 and the energy storage device realize efficient energy transfer and staged 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 electricity period, and the first temperature is the high-temperature water temperature close to the saturation temperature, and the high-temperature water is delivered 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 first water vapor for delivery to a steam use system.

[0118] In a specific implementation, referring to Figure 2 and Figure 3 , the energy storage device comprises at least one energy storage module 50, and each energy storage module 50 adopts a double-layer structure of an outer cylinder and an inner cylinder. The outer cylinder and the inner cylinder are filled with a heat storage medium (such as molten salt), and a first heat exchange pipeline 52 and a second heat exchange pipeline 53 are respectively arranged on the inner wall of the outer cylinder and the outer wall of the inner cylinder. The first heat exchange pipeline 52 is used for heat transfer of high-temperature water, and can further heat the water to first water vapor at a second temperature; the second heat exchange pipeline 53 is used for deep heat release of the heat storage medium, and is preheated by the heat pump device 20 during the valley electricity period. Preferably, the first heat exchange pipeline 52 is a heat exchange coil welded to the inner wall of the outer cylinder, and the second heat exchange pipeline 53 is a heat exchange coil welded to the outer wall of the inner cylinder, 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] Further, to enhance the applicability and flexibility of the energy storage device, the inner cylinder in the embodiment can be provided in multiple numbers and adopt different structural configuration forms. For example, multiple inner cylinders can be nested to form a concentric circular arrangement, or multiple single inner cylinders can be independently provided. The internal structure design of the inner cylinder supports multiple implementation modes: molten salt can be filled to increase the energy storage capacity, solid heat exchange materials (such as graphite blocks) can be filled to enhance the heat conduction performance, or even a hollow structure can be designed for direct heat exchange under specific conditions. In addition, the types of molten salt between the inner cylinder and the outer cylinder can be the same, or different types of molten salt can be selected according to specific working conditions, for example, the inner cylinder is filled with low-melting-point molten salt, and the outer cylinder is filled with high-melting-point molten salt, to realize a wider temperature operating range.

[0120] To adapt to the needs of large-scale production and subsequent expansion, the molten salt energy storage module in the embodiment adopts a modular design, and the energy storage capacity of a single module is Q0, and the upper limit of the 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 modes to meet different working condition requirements.

[0121] In a specific design, to ensure that the maintenance of a single module does not affect the overall heat supply, the number of modules needs to meet the following conditions: the daily steam demand of the user side is Q, and the hourly steam power is P. If then take n = 2, that is, at least 2 modules are needed; if n ≥ 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 demand. In a more specific embodiment, the selected power of the heat pump device 20 is 10% of the total steam demand of the user side, that is, 10% * Q / t, where t is the operating hours of the heat pump device 20. Through reasonable selection, the heat pump device 20 can efficiently operate in the valley electricity period, produce high-temperature water close to the saturation temperature, and supply the energy storage module 50, effectively reducing the overall energy consumption of the system.

[0122] In a high steam demand scenario, the energy storage module 50 can switch to a parallel operation mode, each module independently releases heat, forming multiple steam generation paths to meet the rapid steam demand and significantly improve the steam response speed; in a low steam demand scenario, the energy storage module 50 switches to a series operation mode, using the low-temperature molten salt that has released part of the heat to preheat other modules, to maximize the use of heat storage medium, thereby optimizing energy efficiency. In addition, to enhance the operation flexibility, in the series mode, the preheating flow rate between modules can be dynamically adjusted to optimize heat distribution.

[0123] This embodiment specifically adopts three parallel molten salt energy storage modules, with a working temperature range of 180°C to 400°C (fifth temperature to fourth temperature), 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 can be used according to demand. Different energy storage modules 50 can be the same or different, and the working temperature can be set uniformly or in segments. For example, in a system requiring multi-stage heat supply, molten salt energy storage modules (high-temperature section), phase change energy storage modules (medium-temperature section), and solid energy storage modules (low-temperature section) can be combined 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 aluminum), to improve the heat transfer efficiency and adapt to the high heat flux density demand 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 material volume and improving system compactness.

[0125] In a specific embodiment, the energy storage module 50 further comprises electric heaters 51 configured to be inserted straight from the top of the energy storage module 50, with a distance of 100-200 mm from the bottom of the module, to balance the heating effect and the temperature control requirements of the module base. The number of electric heaters 51 is generally 5-6, of which one is a full-section heater for melting the solid molten salt, the immersed part of which can generate heat throughout the section, and the power is adjusted by a thyristor, and the remaining electric heaters 51 are 2 / 3-section heaters, which only heat the lower 2 / 3 part of the molten salt and the power is not adjustable. By reasonably configuring the heating section, combined with the temperature stratification characteristics of the upper hot and lower cold 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] Further optimization, the heat pump device 20 adopts a transcritical carbon dioxide cycle design, which realizes heat conversion from a low-temperature heat source to a high-temperature heat carrier through an efficient transcritical cycle. This design allows the outlet temperature range of the heat pump to be accurately controlled within a range close to the saturation temperature (such as 90-98°C), providing high-temperature water at the optimal working temperature for the energy storage device, significantly improving the heating efficiency of the energy storage device. The selection of the heat pump device 20 can be based on different heat source conditions, such as air source heat pump, water source heat pump, ground source heat pump or waste heat source heat pump, and the specific configuration can be optimized based on environmental conditions and steam demand. Further, the heat pump device 20 can adopt a cascade heating design to meet higher temperature requirements.

[0127] Further optimization, the water storage device 30 is connected between the heat pump device 20 and the energy storage device, with sealing and pressurization functions, for maintaining the liquid state of high-temperature water and avoiding phase change heat loss. To further optimize 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 thermal insulation water tank design, keeping the internal pressure at about 0.6 MPa to ensure that the saturation temperature of the water reaches about 158°C. Under this pressure condition, when the water is heated to a first temperature (150°C) by the heat pump device 20, the water remains in a liquid state and is slightly below the saturation temperature, which makes full use of the heating capacity and high energy efficiency of the heat pump.

[0128] Further, when using a heat pump device 20 with higher heating capacity (such as heating to 180°C or higher), the internal pressure of the water storage device 30 can be correspondingly increased 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 1.0 MPa, 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, the heating capacity and working condition requirements of different types of heat pumps can be flexibly adapted, further improving the applicability and energy efficiency of the system.

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

[0130] Therefore, by combining the heat pump heating capacity with the design of the pressurized heat preservation water tank, the present scheme realizes the full utilization of the high energy efficiency heating characteristics of the heat pump device 20, and at the same time, through the dynamic pressure adjustment of the water storage device 30, it adapts to diversified working condition requirements, providing reliable guarantee for efficient and stable steam heating.

[0131] In addition, the present application also gives 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 heat preservation water tank works under different temperature conditions, the change of the overall COP of the system is analyzed. When the temperature of the heat preservation water tank 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 that the COP of the heat pump is 3.0, the input electric energy of the heat pump is W 热泵 =Q 热泵 ÷COP=357÷3.0=119kJ / kg. The energy storage device needs to heat the water from 95℃ to 180℃, and the required heat is Q 储能 =1×4.2×(180-95)=357kJ / kg. Assuming that the efficiency of the energy storage device is 90%, the energy storage loss is L 储能 =Q 储能 ×0.1=35.7kJ / kg. The total input electric energy of the system is W 总＝ W 热泵 +L 储能 =119+35.7=154.7kJ / kg, the total output heat is Q 总输出 =Q 热泵 +Q 储能 =357+357=714kJ / 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 heat preservation water tank is increased to 150℃, the heat pump needs to heat the water from 10℃ to 150℃, and the required heat is Q 热泵= 1 x 4.2 x (150 - 10) = 588 kJ / kg. Assuming the heat pump COP drops to 2.2, the heat pump input electrical energy is W 热泵 = Q 热泵 ÷ COP = 588 ÷ 2.2 = 267.3 kJ / kg. The energy storage device only needs to heat the water from 150°C to 180°C, the required heat is Q 储能 = 1 x 4.2 x (180 - 150) = 126 kJ / kg, the energy storage loss is L 储能 = Q 储能 x 0.1 = 12.6 kJ / kg. The total input electrical energy of the system is W 总 = W 热泵 + L 储能 = 267.3 + 12.6 = 279.9 kJ / kg, the total output heat 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, although the heat pump COP drops from 3.0 to 2.2 due to the increase of outlet temperature, the total COP of the system increases from 0.97 to 1.02 due to the significant reduction of the energy storage device burden, which shows that increasing the temperature of the insulated water tank can optimize the overall efficiency of the system within a certain range. In practical applications, the working temperature of the insulated water tank needs to be further simulated and optimized according to the specific system parameters to achieve the best performance.

[0135] In further optimized embodiments, the energy storage coupled heat pump steam generation system includes various pipelines and control components for efficient heat transfer and flexible control of system operation. The pipeline and control components mainly include a first feedwater pipeline, a recirculation branch 41, a desuperheating water branch 42, a second feedwater pipeline, a preheating loop, a branch valve group, and cooperating electric valves, a main 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 for conveying 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, to ensure the continuity and reliability of water supply through an automatic switching mechanism. The water supply pump group is connected to the mother pipe valve group after the group, which is used for adjusting the flow of high-temperature water conveyed to the energy storage module 50, to ensure that different steam load requirements are met. If multiple energy storage modules 50 are included in the system, the mother pipe valve group is connected to each module through the branch pipe valve group, which is used for accurately adjusting the flow of high-temperature water into each energy storage module 50 to ensure that the water inflow of each module is uniform during operation. In addition, an electric valve is arranged between each branch pipe valve group and the energy storage module 50, which is used for shutdown operation when a specific module stops running or is under maintenance.

[0137] A recirculation branch 41 is led out from between the mother pipe valve group and the energy storage module 50 and connected to the water storage device 30, which is used for realizing the backflow of high-temperature water when the system is running. The recirculation branch 41 can be opened through bypass adjustment when the system pressure rises rapidly, and part of the water supply is backflowed to the water storage device 30, thereby reducing the water inflow into the energy storage module 50, controlling the pressure fluctuation of the system, and avoiding overpressure operation of the system.

[0138] A desuperheating water branch 42 is led out from between the water supply pump group and the mother pipe valve group in the first water supply pipeline and connected to the desuperheater 70. The desuperheating water conveyed through 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 mode of the desuperheating water branch 42 ensures that the inlet pressure of the desuperheating water pipeline is not affected by the action of the mother pipe valve, and ensures that the steam temperature on the user side does not exceed the limit under any working condition.

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

[0140] The desuperheater 70 is connected to the pressure stabilizing device through the steam input port, the pressure stabilizing device is connected to the energy storage module 50, and 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 desuperheater 70. The desuperheater 70 is connected to 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 through the steam cylinder 60 and then combined into one before entering the desuperheater 70, and is fully mixed with the desuperheating water to output the steam temperature meeting the user's demand. The design of the desuperheater 70 can flexibly adjust the steam temperature to adapt to different user side process requirements, to ensure 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 the heat pump device 20 during the valley electricity period. The preheating circuit includes a third feedwater pipe and a preheating return water pipe, which are connected between the heat pump device 20 and the energy storage module 50 respectively, forming a closed loop to achieve efficient heating of the heat storage medium below the first temperature. Specifically, the third feedwater pipe is connected to the outlet end of the heat pump device 20, used to transport high-temperature water heated by the heat pump to the heat exchange pipe 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 pipe is connected to the outlet end of the heat exchange pipe inside the energy storage module 50, used to return the low-temperature water after heat exchange to the inlet end of the heat pump device 20 for cyclic heating. Through the preheating circuit, the heat pump can realize step-by-step heating 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] Further, the heat exchange pipe of the energy storage module 50 is designed to be compatible with the operation mode of the preheating circuit. The third feedwater pipe and the preheating return water pipe in the preheating circuit are connected to the inlet and outlet of the heat exchange pipe of the energy storage module 50, so that the third feedwater pipe, the heat exchange pipe and the preheating return water pipe together constitute an efficient preheating circulation circuit. In addition, in order to further improve the preheating efficiency of the energy storage module 50, an independent preheating pipe can be additionally provided inside the energy storage module 50. The third feedwater pipe and the preheating return water pipe are connected to the independent preheating pipe respectively, forming a more specialized preheating circuit for specifically processing the low-temperature preheating demand of the heat storage medium under specific working conditions. Specifically, the preheating circuit is connected to the first heat exchange pipe 52 and / or the second heat exchange pipe 53, and preferably the second heat exchange pipe 53, and the preheating pipe is provided on the inner cylinder wall surface of the energy storage module 50, preferably welded to the outer wall surface of the inner cylinder.

[0143] In this embodiment, the preheating circuit not only preheats the heat storage medium by the heat pump during the valley electricity 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 blowdown pipe 43, and a multi-stage pressure protection and pressure relief assembly 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 bypass is arranged in front of the inlet of the pure water tank 13. When the water treatment device 12 cannot work normally, tap water can directly enter the pure water tank 13 through the bypass as a temporary water source. Specifically, raw water is connected from the tap water pipeline in the factory area, first enters the raw water tank 11, and the raw water tank 11 acts as a buffer device and can store about 3-6 hours of water consumption to respond to instantaneous water demand fluctuations. The raw water is transported to the water treatment device 12 by a raw water pump for softening and desalination. The desalted water quality after treatment should meet the water quality standard of GB / T1576 “Industrial Boiler Water Quality” for tubular boiler. 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 to ensure the continuous water supply capacity of the system during maintenance or shutdown of the water treatment device 12.

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

[0147] In other embodiments, the deionized water supply device can also supply water to the energy storage module 50 and the desuperheater input port according to the demand.

[0148] The water supply port of the energy storage module 50 is connected with a blowdown pipeline 43 for discharging residual working medium in the energy storage module 50 in the case of system shutdown or emergency. A blowdown valve is arranged near the water supply port of the blowdown pipeline 43, which can include an electrically controlled valve and a manually controlled valve. In normal operation, the blowdown valve is kept closed. When the system is shut down or overpressure, the blowdown valve is opened, and the residual water working medium is pressed into the blowdown well by the residual pressure in the energy storage module 50, so as to ensure that there is no residual working medium in the system, thereby improving the operation safety.

[0149] A steam pipeline 44 connects the energy storage module 50 with 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 jumps to release excess steam and prevent system overpressure. After the steam is output, it is collected into the cylinder 60 and connected to the desuperheater 70 through the steam main pipe. An overpressure relief valve 82 is arranged on the steam main pipe. When the steam pressure exceeds the second warning value, the overpressure relief valve 82 is automatically opened to discharge excess steam to a safe area.

[0150] To ensure the safety of the system under different operating conditions, the system is provided with four pressure protection measures: the first warning: when the steam pressure exceeds the set threshold, the feedwater main regulating valve automatically adjusts the flow according to the pressure signal, controls the amount of high-temperature water entering the energy storage module 50, and balances the system pressure; the second warning: when the pressure continues to rise, the overpressure relief valve 82 opens, and the excess steam is discharged 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 blowdown valve opens to quickly discharge all working fluids to the blowdown well to quickly reduce the system pressure; the fourth warning: in the case of extreme overpressure, the mechanical safety valve 81 automatically jumps to release steam, ensuring the safe operation of the system and equipment. Through the above multi-stage pressure protection design and the rapid response capability of the blowdown pipeline 43, the system can quickly take measures in the case of sudden pressure fluctuations, significantly reducing the risk of overpressure and improving the safety and stability of operation.

[0151] In further embodiments, the energy storage module 50 is configured 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, mainly used for rapid warming in the starting stage or heat supplement in low-load operation, and the emergency heating module includes an emergency heating pipeline that can be connected in series or parallel with the heat exchange pipeline of the energy storage module 50 to provide supplemental heating when the energy storage module 50 is insufficient in heat dissipation power or part of the module is under maintenance. Through the above configuration, the system can achieve continuous and stable heat supply in the starting, load peak, or special working conditions, significantly improving the operational efficiency and safety.

[0152] The present application also provides an energy storage coupled heat pump steam generation method, which utilizes the efficient heating capacity of the heat pump device 20 during off-peak hours to heat water to high-temperature water at a first temperature, and further heats it to first water vapor at a second temperature through the energy storage module 50, to meet the steam demand of the user side. This method realizes efficient use of energy and optimizes the operational economy and flexibility of the system. It should be noted that each embodiment of the energy storage coupled heat pump steam generation method below is suitable for operation in the aforementioned system structure, but is not limited to the aforementioned system structure.

[0153] According to a specific embodiment of the present application, as Figures 4-7 The energy storage coupled heat pump steam generation method in this embodiment includes the following steps:

[0154] S1, use the heat pump device 20 to heat the desalted water to high-temperature water at a first temperature (close to the saturation temperature), and store it in the water storage device 30.

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

[0156] Further, 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 above 100°C. At this time, the embodiment uses a pressurized heat preservation water tank to maintain the liquid state of the high-temperature water by setting a specific pressure value. At the same time, the first feedwater pipeline is also matched with pressure regulation, and serves as a pressure pipeline for the transportation of high-temperature water between the heat pump device 20 and the water storage device 30.

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

[0158] Further, the following steps are included:

[0159] S3, the second water vapor at the second temperature is mixed with the high-temperature water at the first temperature by using the desuperheater 70 to generate second water vapor at a third temperature, which is between the first temperature and the second temperature (for example, 180-250°C), for meeting the demand of the steam using system for steam at different temperatures.

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

[0161] In another embodiment (operation regulation of the energy storage device and the heat pump device 20), as Figures 5-7 , the following specific steps are included:

[0162] S10, the first steam demand during the steam supply period is predicted by using the historical data and real-time working conditions of the steam using system, and the corresponding first water vapor enthalpy increment is determined. According to the prediction result, the operation of the energy storage device and the heat pump device 20 is regulated.

[0163] S20, in the valley period, the energy storage device stores heat in the form of electricity to heat the heat storage medium (such as molten salt) to a set fourth temperature (such as 400℃). Preferably, the heating temperature of the heat storage medium is dynamically adjusted according to the demand, ensuring the economy and effectiveness of heat storage.

[0164] S30, control the heat pump device 20 to run at least part of the time in the valley period to prepare the required high-temperature water, and heat the desalted water to a first temperature close to the saturation temperature (such as 90℃).

[0165] S40, the total of the second enthalpy increment provided by the energy storage device and the first enthalpy increment provided by the heat pump device 20 is matched with the enthalpy increment of the first steam corresponding to the first steam demand.

[0166] Further, the proportion of the heat pump device 20 running in the valley period is optimized, and the specific process is:

[0167] S31, obtain the power supply capacity available for steam generation in the valley period, and determine the second power consumption required by the energy storage device in the valley period;

[0168] S32, calculate the first difference value of the power supply capacity and the second power consumption of the energy storage device:

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

[0170] If the first difference value is insufficient, the heat pump device 20 uses the first difference value to partially prepare the high-temperature water in the valley period, and the remaining part is supplemented and completed in the flat period.

[0171] S33, calculate the first power consumption required by the heat pump device 20 to prepare all high-temperature water to meet the steam supply demand in the valley period. The first power consumption is a function of the running time, power and water heating demand of the heat pump device 20, which ensures that the prepared high-temperature water can meet the demand of the first temperature.

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

[0173] S35, real-time monitor the first difference value and the heating capacity of the heat pump device 20, when the first difference value and the heating capacity of the heat pump device 20 exceed the demand of the high-temperature water of the first temperature, use the second difference value to provide preheating heat for the energy storage device through the heat pump device 20.

[0174] Further, the 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 on the user side.

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

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

[0178] The embodiment realizes the optimal allocation of electricity resources during the valley electricity period. After the high-temperature water demand is met, the remaining electricity is used to preheat the energy storage device, reducing the heating burden during the steam supply period and further improving the energy efficiency of the system. At the same time, in the later stage of steam supply or in the peak load scenario, the auxiliary heating module and the heat pump device 20 are dynamically regulated to effectively avoid steam supply interruption caused by insufficient energy storage capacity.

[0179] The embodiment realizes the optimal allocation of electricity resources during the valley electricity period. After the high-temperature water demand is met, the remaining electricity is used to preheat the energy storage device, reducing the heating burden during the steam supply period and further improving the energy efficiency of the system. At the same time, in the later stage of steam supply or in the peak load scenario, the auxiliary heating module and the heat pump device 20 are dynamically regulated to effectively avoid steam supply interruption caused by insufficient energy storage capacity.

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

[0181] S71, using historical data and real-time working conditions, the first steam demand and the maximum steam demand rate during the steam supply period are predicted, corresponding to the total heat demand and the instantaneous heat supply capacity demand of the energy storage device, respectively. According to the steam demand characteristics, the enthalpy increments of the heat pump device 20 and the energy storage device are calculated, and the first ratio of the two is determined. Preferably, the heat pump device 20 operates in the high-efficiency interval and mainly provides the first enthalpy increment for preparing high-temperature water; the energy storage device bears the high-enthalpy heat output as the second enthalpy increment to meet the high-temperature demand of steam generation.

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

[0183] S72, in combination with the first steam demand and the first matching ratio, the energy storage capacity of the energy storage device is determined to ensure sufficient heat reserve during the steam supply period. The preferred heat storage medium is molten salt, and the required mass and volume are calculated according to the working temperature range and the specific heat capacity to ensure the economy and effectiveness of heat storage.

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

[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, optimizes the design of the energy storage capacity and the heat release power. The heat pump device 20 operates in the high energy efficiency interval to prepare high temperature water; the energy storage device provides high enthalpy heat to meet the instantaneous load demand. This method realizes the hierarchical utilization and accurate matching of heat energy, reduces the operating cost, enhances the adaptability of the system to load fluctuations, and provides an efficient and stable steam heating scheme.

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

[0187] S110, in the valley electricity period, the low melting point molten salt with an initial temperature of the eighth temperature (such as 40℃) is heated to the first temperature (such as 90℃) by the heat pump device 20. This process fully utilizes the low-cost valley electricity and the high-efficiency heating capacity of the heat pump to provide basic heat reserve for subsequent electric heating of molten salt.

[0188] S120, in the valley electricity period or the flat electricity low load period, the molten salt is heated from the first temperature to the fourth temperature (such as 400℃) by the electric heater 51. This step lays the foundation for high enthalpy output of the energy storage module 50 and ensures sufficient heat reserve during the steam supply period.

[0189] S130, during the steam demand period, part of the molten salt of the energy storage module 50 is heat released from the fourth temperature to the fifth temperature (such as 200℃), and the second temperature of superheated steam (such as 180-370℃) is generated through the heat exchange pipeline. This stage adopts a parallel structure of multiple steam generation channels to meet the set steam demand flow.

[0190] S140, when the molten salt of part of the energy storage module 50 is discharged to the fifth temperature, the heat exchange pipeline is switched to the series mode, so that these modules provide high-temperature water preheating for the energy storage module 50 still in the high-temperature state (the fourth temperature), and the energy storage module 50 is further discharged to the sixth temperature (such as 120 DEG C). This step optimizes the energy utilization efficiency of the high-temperature section of the molten salt, and realizes the gradient collaborative heat release of the energy storage module 50.

[0191] S150, after the molten salt is discharged to the sixth temperature, the low-temperature water is heated to the first temperature (such as 90 DEG C) and stored by adjusting the flow of the heat exchange pipeline. In this stage, the low-flow operation mode is adopted to realize maximum heat recovery and further discharge the molten salt to the seventh temperature (such as 100 DEG C).

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

[0193] S170, when the molten salt of all energy storage modules 50 is discharged to the eighth temperature, the step S110 is restarted, and the heat pump device 20 is used to preheat the molten salt, and the next cycle is entered. At the same time, the heat release mode (parallel or series) and the operation parameters of the energy storage module 50 are dynamically adjusted to adapt to 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 is in the range of 20 to 50 DEG C; the sixth temperature is higher than the first temperature by a third temperature difference, and the third temperature difference is in the range of 10 to 30 DEG 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] The embodiment realizes the deep utilization of the energy storage module 50 by discharging in stages and levels. The switching of the parallel and series modes optimizes the collaborative efficiency of the energy storage module 50 at different temperature sections, and significantly improves the response speed and stability of the steam supply. At the same time, by preheating and waste heat recovery of the heat pump device 20, the low-cost valley electricity and low-temperature residual energy are fully utilized, the operation cost is reduced, the economic efficiency and environmental adaptability of the system are enhanced, and an efficient and stable solution for industrial steam under complex working conditions is provided.

[0196] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, and the implementation steps can be combined, which all belong to the protection scope of the present application; therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for generating steam using an energy storage coupled heat pump, characterized in that, The method comprises the following steps: heating water to a first temperature by a heat pump device; further heating the high-temperature water from the first temperature to a second temperature by an energy storage device, the second temperature corresponding to the temperature of the first water vapor; and providing preheating heat for the energy storage device by the heat pump device, comprising: obtaining the power supply capacity available for steam generation during the valley electricity period; calculating the second electricity consumption required by the energy storage device during the valley electricity period; calculating the first difference between the power supply capacity and the second electricity consumption; calculating the first electricity consumption required by the heat pump device to prepare all high-temperature water; calculating the second difference between the first difference and the first electricity consumption; when the first difference and the heating capacity of the heat pump device exceed the heating demand of the high-temperature water at the first temperature, using the second difference to provide preheating heat for the energy storage device.

2. The energy storage coupled heat pump steam generation method of claim 1, wherein, Further comprising the following steps: delivering the high-temperature water generated by the heat pump device to a water storage device, the first temperature of the high-temperature water including a temperature range above 100℃, the water storage device having a sealing and pressurizing function for maintaining the liquid state of the high-temperature water; stably delivering the high-temperature water from the water storage device to the energy storage device for further heating to generate superheated steam at the second temperature.

3. The energy storage coupled heat pump steam generation method of claim 1 or 2, wherein, The first temperature is lower than the saturation temperature at its corresponding pressure, and the temperature difference ranges from 2 to 10℃.

4. The energy stored coupling heat pump steam generation method of claim 1, wherein, Further comprising the following steps: mixing the first water vapor at the second temperature with the high-temperature water at the first temperature by a desuperheater to generate second water vapor at a third temperature, the third temperature being between the first temperature and the second temperature, for meeting the demand of steam using system for steam at different temperatures.

5. The energy stored coupling heat pump steam generation method of claim 1, wherein, Further comprising the following steps: predicting the first steam demand of the steam using system during the steam supply period; storing heat by the energy storage device in an electric heating manner during the valley electricity period; controlling the heat pump device to run at least partially during the valley electricity period to prepare high-temperature water at the first temperature; matching the sum of the second enthalpy increment provided by the heat release of the energy storage device and the first enthalpy increment provided by the heating of the heat pump device to 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, wherein the proportion of the heat pump device running during the valley electricity period is determined by the following steps: obtaining the power supply capacity available for steam generation during the valley electricity period; calculating the second electricity consumption required by the energy storage device during the valley electricity period; calculating the first difference between the power supply capacity and the second electricity consumption; when the first difference is sufficient to complete the preparation amount 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 is insufficient to complete the preparation amount of the high-temperature water, the heat pump device uses the first difference to complete the preparation of part of the high-temperature water, and the remaining preparation amount 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 5, wherein 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.

8. The energy storage coupled heat pump steam generation method of claim 1, wherein the energy storage device comprises a plurality of energy storage modules, and heat exchange pipelines of the plurality of energy storage modules are configured to be connected in parallel between any two energy storage modules to form multiple steam generation paths or connected in series to form a single steam generation path by switching operation.

9. The energy storage coupled heat pump steam generation method of claim 8, wherein during a steam supply period, the plurality of energy storage modules of the energy storage device releases heat by: connecting the heat exchange pipelines of the plurality of energy storage modules in parallel to form multiple steam generation paths, and allowing the heat storage medium of some energy storage modules to release heat from the fourth temperature to the fifth temperature to generate superheated steam at the second temperature; switching the heat exchange pipelines to series connection, allowing the energy storage modules that have released heat to the fifth temperature to provide high-temperature water preheating for energy storage modules with higher temperature, and further releasing heat of the heat storage medium to the sixth temperature; adjusting the heat exchange pipelines of the energy storage modules to generate high-temperature water at the first temperature by heating deionized water and storing, and further releasing heat of the heat storage medium to the seventh temperature; and / or adjusting the heat exchange pipelines of the energy storage modules to generate hot water for heating by heating deionized water, and further releasing heat of the heat storage medium to the eighth temperature.

10. The energy storage coupled heat pump steam generation method of claim 9, wherein the fifth temperature is higher than the second temperature by a second temperature difference, the second temperature difference ranges from 20 to 50℃; the sixth temperature is higher than the first temperature by a third temperature difference, the third temperature difference ranges from 10 to 30℃; the fourth temperature is higher than the sixth temperature by a fourth temperature difference, 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, the fifth temperature difference ranges from 2 to 10℃; and / or the eighth temperature is lower than the first temperature.

11. The energy storage coupled heat pump steam generation method of claim 1, wherein the energy storage device comprises an auxiliary heater for supplementary heating of the high-temperature water; or when the heat release power of the energy storage device is insufficient, the auxiliary heating module is used to heat the high-temperature water to the first water vapor at the second temperature.

12. The energy storage coupled heat pump steam generation method of claim 1, wherein the energy storage capacity and the heat release power of the energy storage device are determined by: predicting the first steam demand and the maximum steam demand rate during the steam supply period; determining the first ratio between the first enthalpy increment provided by the heat pump device and the second enthalpy increment provided by the energy storage device; determining the energy storage capacity according to the first enthalpy increment; determining the heat release power according to the maximum steam demand rate and the first ratio.

13. The energy storage coupled heat pump steam generation method of claim 1, wherein ​ ​ ​ ​ ​ ​ ​ ​ 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 adopts carbon dioxide as a circulating working medium and operates in a transcritical cycle state; and / or, The heat pump device is configured to operate in a cascade heating mode; and / or, The heat storage medium of the energy storage device is a low-melting mixed molten salt with a melting point lower than 100°C.

14. The energy storage coupled heat pump steam generation method of claim 1, wherein, at least one energy storage period and one steam supply period which does not completely overlap in a day; in the energy storage period, the heat storage medium in the energy storage device is heated by electric heating to store energy; in the steam supply period, the high-temperature water at the first temperature is heated to the second temperature by the heat released from the heat storage medium to generate the first water vapor.

15. An energy storage coupled heat pump steam generation system, characterized by, The energy storage coupled heat pump steam generation method of any one of claims 1-14, comprising: a heat pump device for heating water to a first temperature; an energy storage device comprising at least one energy storage module filled with a heat storage medium and equipped with a heat exchange pipeline for receiving high-temperature water at the first temperature and further heating to a second temperature by the heat storage medium to generate the first water vapor.

16. The energy storage coupled heat pump steam generation system of claim 15, wherein, Further comprising: a water storage device in fluid connection with the heat pump device for heat preservation and storage of the high-temperature water heated to the first temperature by the heat pump device; a first feedwater pipeline connecting the water storage device and the energy storage module for conveying the high-temperature water in the water storage device to the heat exchange pipeline; a pressure stabilizing device connected to the energy storage module for the energy storage module to supply the first water vapor to the pressure stabilizing device; a desuperheater comprising a steam input port connected to the pressure stabilizing device and a desuperheating water input port connected to the first feedwater pipeline, the desuperheater mixing the water vapor input from the steam input port and the desuperheating water input from the desuperheating water input port to output the second water vapor at a third temperature lower than the second temperature.

17. The energy storage coupled heat pump steam generation system of claim 16, wherein, the water storage device has a sealing and pressurizing function for maintaining the high-temperature water at a temperature higher than 100°C in a liquid state.

18. The energy storage coupled heat pump steam generation system of claim 16, wherein, the first feedwater pipeline comprises: a feedwater pump group and a mother pipe regulating valve group connected in series to the energy storage module; a desuperheating water branch leading from between the feedwater pump group and the mother pipe regulating valve group and connected to the desuperheating water input port; a recirculation branch leading from between the mother pipe regulating valve group and the energy storage module and connected to the water storage device for realizing the backflow of the high-temperature water during system operation.

19. The energy storage coupled heat pump steam generation system of claim 15, wherein, the heat exchange pipelines of the plurality of energy storage modules are configured to be connected in parallel between any two energy storage modules to form multiple steam generation paths or connected in series to form a single steam generation path through switching operation.

20. The energy storage coupled heat pump steam generation system of claim 16, wherein, Further comprising a deionized water supply device, The deionized water supply device is adapted to supply deionized water to the heat pump device, and / or the energy storage module, and / or the desuperheater input port.

21. The energy storage coupled heat pump steam generation system of claim 15 or 16, wherein, Further comprising a second feedwater line, The second feedwater line is connected between the heat pump device and the energy storage module, and is used to transport high-temperature water generated by the heat pump device to the heat exchange line.

22. The energy storage coupled heat pump steam generation system according to claim 15, wherein Further comprising a preheating loop, the preheating loop comprising a third feedwater line and a preheating return water line, both of which are connected between the heat pump device and the energy storage module to form a loop, and are used to cause the heat pump device to heat the heat storage medium below the first temperature.

23. The energy storage coupled heat pump steam generation system according to claim 22, wherein The third feedwater line and the preheating return water line are both connected to the heat exchange line, so that the third feedwater line, the heat exchange line, and the preheating return water line are adapted to constitute the preheating loop; and / or, the energy storage module is further provided with a preheating line, and the third feedwater line and the preheating return water line are both connected to the preheating line, so that the third feedwater line, the preheating line, and the preheating return water line are adapted to constitute the preheating loop.

24. The energy storage coupled heat pump steam generation system according to claim 15, wherein The energy storage module comprises an outer cylinder and an inner cylinder, the inner cylinder is arranged in the outer cylinder, and the heat storage medium is arranged between the outer cylinder and the inner cylinder; and the heat exchange line comprises a first heat exchange line arranged in the outer cylinder and a second heat exchange line arranged in the inner cylinder.

25. The energy storage coupled heat pump steam generation system according to claim 24, wherein The first heat exchange line is a heat exchange coil welded to the inner wall of the outer cylinder, and the second heat exchange line is a heat exchange coil welded to the outer wall of the inner cylinder.

26. The energy storage coupled heat pump steam generation system according to claim 24, wherein The second heat exchange line is also used for preheating of the heat storage medium below the first temperature.

27. The energy storage coupled heat pump steam generation system according to claim 16, wherein Further comprising: a steam line connected between the energy storage module and the pressure stabilizing device, and provided with a mechanical safety valve; a steam main pipe connected to the steam outlet of the desuperheater, and provided with an overpressure relief valve; a blowdown line connected to the feedwater inlet of the energy storage module and communicated to a blowdown well, and provided with a blowdown valve.

28. The energy storage coupled heat pump steam generation system according to claim 18, wherein When a plurality of energy storage modules are included, a branch pipe valve group is further included, which is arranged between the main pipe valve group and each energy storage module, and is used to adjust the flow of high-temperature water into each energy storage module.

29. The energy storage coupled heat pump steam generation system according to claim 15, wherein The heat storage medium comprises 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, the heat pump device uses carbon dioxide as a circulating working medium and operates in a transcritical cycle state; and / or, The heat pump device is configured to operate in a cascade heating mode.

30. The energy storage coupled heat pump steam generation system of claim 15, wherein, The energy storage module further comprises an auxiliary heater adapted to heat the fluid in the heat exchange pipeline; or, The steam generation system further comprises an emergency heating module, the emergency heating module comprises an emergency heating pipeline, the emergency heating pipeline and the heat exchange pipeline are connected in series or in parallel, and the emergency heating pipeline is used for auxiliary heating when the heat release power of the energy storage module is insufficient.

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