Thermal storage system with sensible heat storage and latent heat storage coupled and method of operating the same

Abstract

The application discloses a sensible heat storage-latent heat storage coupled heat storage steam supply system and an operation method thereof, which comprises a heater, a sensible heat supply device, a packed bed and a water storage device. The heater is communicated with the sensible heat storage device to store heat in the sensible heat storage device. The sensible heat storage device is provided with heat exchange pipes. The inlets of the heat exchange pipes are communicated with the water storage device. The outlets of the heat exchange pipes are communicated with the inlet of the packed bed. The packed bed is filled with phase change materials. The steam outlet of the packed bed is communicated with the heat exchange pipes and steam users. The sensible heat storage-latent heat storage coupled heat storage steam supply system provided by the application takes the sensible heat storage device as the main heat storage and steam supply device to generate saturated steam. The packed bed is used as the device for superheating steam and stabilizing the outlet temperature to superheat steam and control the temperature. Low-valley electricity or clean energy is used to generate heat, and the heat energy is stored. The heat energy is released during the peak electricity and flat electricity in the daytime, so that the heat cost of industrial steam users is reduced.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a sensible heat storage-latent heat storage coupled thermal storage and steam supply system and its operation method. Background Technology

[0002] A stacked bed is a compact and efficient integrated heat storage and heat exchange device. Its structure consists of a container filled with granular heat storage media, stacked in a specific manner with gaps between them allowing fluid to pass through. When hot fluid passes through the stacked bed, the heat storage media is heated, increasing its temperature and thus storing heat; when cold fluid passes through the stacked bed, the heat storage media is cooled, decreasing its temperature and thus releasing heat. The heat source for the stacked bed heat storage process can be solar energy, industrial waste heat, or electricity generated from wind power, photovoltaics, etc. The heat release process can be used for heating, supplying steam, or generating electricity through a thermodynamic cycle.

[0003] With the continuous implementation of the "3060" carbon neutrality initiative, the demand for clean heating from various energy-intensive enterprises in my country is constantly increasing. Industrial steam, as an important energy source for industry, is usually obtained by directly heating liquid water in the factory's own power plant. However, in today's advocacy of carbon neutrality, this method is too costly and cannot be utilized during peak and off-peak electricity periods. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a thermal storage and steam supply system coupled with sensible and latent heat storage. Embodiments of this invention also propose an operation method for this coupled thermal storage and steam supply system.

[0005] An embodiment of the present invention provides a sensible heat storage-latent heat storage coupled thermal storage and steam supply system, characterized in that it includes: a heater, a sensible heat supply device, a stacked bed, and a water storage device. The heater is used to convert electrical energy into thermal energy. The heater is connected to the sensible heat storage device to store heat in the sensible heat storage device. The sensible heat storage device is provided with a heat exchange tube. The inlet of the heat exchange tube is connected to the water storage device, and the outlet of the heat exchange tube is connected to the inlet of the stacked bed. The stacked bed is filled with a phase change material. The steam outlet of the stacked bed is connected to the heat exchange tube and also connected to a steam user.

[0006] The sensible heat storage-latent heat storage coupled steam supply system provided in this invention uses sensible heat storage equipment as the main heat storage and steam supply equipment to generate saturated steam, while the stacked bed acts as a device for superheating and stabilizing the outlet temperature of the steam for superheating and temperature control. It utilizes off-peak electricity or clean energy to generate heat and stores the thermal energy, releasing it during peak and off-peak electricity periods in the daytime. The resulting superheated steam provides a heat source for various industries or other users. This steam supply system combines sensible heat storage with the latent heat storage of the stacked bed, enabling the clean supply of steam using off-peak electricity. It is a low-carbon and energy-saving steam supply method that solves the problem of industrial steam users being unable to use low-priced steam, reducing their heating costs and possessing significant economic value.

[0007] In some embodiments, the sensible heat supply device includes a housing, an internal cavity of which is filled with a liquid heat storage medium, a heater communicating with the internal cavity of the housing to allow the liquid heat storage medium to circulate and absorb heat, and a heat exchange tube passing through the liquid heat storage medium.

[0008] In some embodiments, the liquid heat storage medium is heat transfer oil or liquid molten salt.

[0009] In some embodiments, the sensible heat storage device includes a plurality of heat storage modules, each of which is provided with a heat exchange tube segment. The plurality of heat exchange tube segments are connected end to end to form the heat exchange tube, and the liquid heat storage medium in the heat storage module is connected. The outlet of the heater is connected to the upstream heat storage module, and the inlet of the heater is connected to the downstream heat storage module.

[0010] In some embodiments, the outlet of the water storage device is connected to the heat exchange tube section of the downstream thermal storage module, and the inlet of the stacked bed is connected to the heat exchange tube section of the upstream thermal storage module.

[0011] In some embodiments, the steam outlet of the bed is connected to the middle of the heat exchange tube.

[0012] In some embodiments, the sensible heat storage device includes a three-way valve, which includes a first inlet, a second inlet, and an outlet. The three-way valve is disposed in the heat exchange tube, the first inlet is connected to the upstream section of the heat exchange tube, the outlet is connected to the downstream section of the heat exchange tube, and the second inlet is connected to the steam outlet of the bed.

[0013] In some embodiments, the bed includes a shell defining a heat exchange cavity, in which a phase change material is deposited, the phase change material being arranged in multiple layers from top to bottom, the phase change temperature of the phase change material in the upper layer being higher than that of the phase change material in the lower layer, and the phase change temperature of the phase change material being higher than a specified temperature of steam discharged from the bed.

[0014] In some embodiments, the thermal storage and steam supply system further includes a temperature sensor for measuring the steam temperature at the steam outlet of the stacked bed. If the steam temperature reaches a specified temperature, the steam enters the downstream equipment; if the steam temperature is lower than the specified temperature, the steam returns to the heat exchange tube.

[0015] Another embodiment of the present invention provides an operation method for a thermal storage and steam supply system, wherein the thermal storage and steam supply system has a thermal storage stage and a thermal release stage, and the operation method includes:

[0016] During the thermal storage stage, new energy power generation or off-peak electricity from the grid provides power to the heater. The heater heats the liquid storage medium in the sensible heat storage device to a specified temperature. The water storage device delivers liquid water to the heat exchange tube. The liquid water absorbs heat and turns into high-temperature steam. The high-temperature steam enters the stacked bed, stores the heat in the stacked bed, and then returns to the heat exchange tube.

[0017] During the heat release phase, the water storage device supplies liquid water to the heat exchange tube. The liquid water absorbs heat and becomes high-temperature saturated steam. The high-temperature saturated steam enters the stacked bed and is further heated into superheated steam. If the temperature of the superheated steam reaches the specified temperature, the superheated steam is supplied to the steam user. If the temperature of the superheated steam does not reach the specified temperature, it returns to the heat exchange tube to continue absorbing heat until the specified temperature is reached. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a thermal storage and steam supply system coupled with sensible heat storage and latent heat storage provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the stacking bed provided in an embodiment of the present invention.

[0020] Figure label:

[0021] Thermal storage and steam supply system 100, heater 1, sensible heat storage equipment 2, liquid thermal storage medium 21, heat exchange tube 22, thermal storage module 23, shell 24, stacked bed 3, phase change material 31, shell 32, heat exchange chamber 33, upper screen 34, lower screen 35, upper chamber 36, lower chamber 37, water storage device 4, first drive pump 6, second drive pump 7, three-way valve 8. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following is based on Figures 1-2This invention describes a sensible heat storage-latent heat storage coupled thermal storage steam supply system 100 provided in an embodiment of the invention. The thermal storage steam supply system 100 includes a heater 1, a sensible heat storage device 2, a stacked bed 3, and a water storage device 4.

[0024] Heater 1 is used to convert electrical energy into heat energy. The electrical energy can be sourced from off-peak electricity from the power grid, or from one or more combinations of wind power, photovoltaic power, and the power grid. A liquid heat storage medium 21 flows within the sensible heat storage device 2, which stores sensible heat. A bed 3 contains a phase change material 31, which stores latent heat through a phase change process. A water storage device 4 stores liquid water, which serves as a raw material for steam generation.

[0025] Heater 1 is connected to sensible heat storage device 2. Liquid heat storage medium 21 circulates between heater 1 and sensible heat storage device 2, allowing heat to be stored in sensible heat storage device 2. As liquid heat storage medium 21 flows through heater 1, heat is gradually transferred to it, causing its temperature to rise continuously. It then returns to sensible heat storage device 2 to store the heat, forming a circulating heating cycle until liquid heat storage medium 21 is heated to a specified temperature, thus storing the heat generated by heater 1 in sensible heat storage device 2. Liquid heat storage medium 21 can be heat transfer oil, liquid molten salt, etc., and its function is heat storage.

[0026] The sensible heat storage device 2 is equipped with a through heat exchange tube 22, which has an inlet and an outlet. The inlet of the heat exchange tube 22 is connected to the water storage device 4, and the liquid water stored in the water storage device 4 enters the heat exchange tube 22 through the inlet. The liquid water flowing in the heat exchange tube 22 exchanges heat with the liquid heat storage medium 21 in the sensible heat storage device 2, and the liquid heat storage medium 21 heats the liquid water in the heat exchange tube 22 into high-temperature steam. The outlet of the heat exchange tube 22 is connected to the inlet of the stacked bed 3, and the heated high-temperature steam enters the stacked bed 3 to exchange heat with the phase change material 31. The steam outlet of the stacked bed 3 is connected to the heat exchange tube 22 and also to the steam user.

[0027] The thermal storage and steam supply system 100 has a thermal storage stage and a thermal release stage. In the thermal storage stage, the temperature inside the bed 3 is relatively low. The high-temperature steam entering the bed 3 transfers heat to the phase change material 31, causing the phase change material 31 to store latent heat through a phase change, thus achieving thermal storage in the bed 3. The outlet of the bed 3 is connected to the inlet of the heat exchange tube 22. The cooled return water after thermal release returns to the heat exchange tube 22 for reheating, and then enters the bed 3 for heat exchange until the temperature inside the bed 3 is heated to the preset thermal storage temperature. In the thermal release stage, the temperature inside the bed 3 is relatively high, and the bed 3 enters a thermal release state. The high-temperature steam entering the bed 3 continues to absorb heat until it becomes superheated. The superheated steam is discharged from the steam outlet of the bed 3. If the steam temperature reaches the specified temperature, it is directly supplied to the steam user for utilization. If the steam temperature does not reach the specified temperature, it returns to the heat exchange tube 22 for reheating. The reheated steam then enters the bed 3 for further heating until the temperature at the steam outlet of the bed 3 reaches the specified steam temperature. It should be noted that, in order to ensure that the steam can reach the specified temperature, the temperature of the phase change material 31 in the bed 3 can be slightly higher than the specified steam temperature.

[0028] The sensible heat storage-latent heat storage coupled steam supply system provided in this invention uses sensible heat storage equipment as the main heat storage and steam supply equipment to generate saturated steam, while the stacked bed acts as a device for superheating and stabilizing the outlet temperature of the steam for superheating and temperature control. It utilizes off-peak electricity or clean energy to generate heat and stores the thermal energy, releasing it during peak and off-peak electricity periods in the daytime. The resulting superheated steam provides a heat source for various industries or other users. This steam supply system combines sensible heat storage with the latent heat storage of the stacked bed, enabling the clean supply of steam using off-peak electricity. It is a low-carbon and energy-saving steam supply method that solves the problem of industrial steam users being unable to use low-priced steam, reducing their heating costs and possessing significant economic value.

[0029] In some embodiments, such as Figure 1 As shown, the sensible heat storage device 2 includes a shell 24, with heat exchange tubes 22 located in the internal cavity of the shell 24. The cavity inside the shell 24 is filled with a liquid heat storage medium 21. The shell 24 is provided with an outlet and an inlet for the liquid heat storage medium that communicate with the internal cavity. The inlet of the liquid heat storage medium is connected to the outlet of the heater 1, and the outlet of the liquid heat storage medium is connected to the inlet of the heater 1. The liquid heat storage medium 21 contacts the heat exchange tubes 22 and exchanges heat with the water inside the heat exchange tubes 22.

[0030] In some embodiments, the sensible heat storage device 2 includes several heat storage modules 23, each containing a heat exchange tube. The heat exchange tube segments in the several heat storage modules 23 are connected end-to-end to form a complete heat exchange tube 22. The liquid heat storage medium 21 in each heat storage module 23 is connected, and the outlet of the heater 1 is connected to the cavity inside the upstream heat storage module 23. The liquid heat storage medium 21 flows sequentially through the connected heat storage modules 23 and exits from the outlet of the downstream heat storage module 23, returning to the inlet of the heater 1. The liquid heat storage medium 21 inside the upstream heat storage module 23 can be heated to a predetermined temperature most quickly, and during the heat storage process of the sensible heat storage device 2, the temperature decreases progressively from the upstream heat storage module 23 to the downstream heat storage modules 23.

[0031] The outlet of the water storage device 4 is connected to the heat exchange tube section (i.e., the inlet of the heat exchange tube 22) of the downstream heat storage module 23, and the inlet of the stacked bed 3 is connected to the outlet of the heat exchange tube 22 of the upstream heat storage module 23. The liquid water entering the heat exchange tube 22 flows through the heat storage module 23 and absorbs heat to become high-temperature steam. The high-temperature steam flows out from the outlet of the heat exchange tube section of the upstream heat storage module 23 and enters the stacked bed 3 to exchange heat with the phase change material inside the stacked bed 3.

[0032] by Figure 1 For example, the sensible heat storage device 2 is equipped with two heat storage modules 23. The upper heat storage module 23 is the upstream heat storage module, and the lower heat storage module 23 is the downstream heat storage module. The lower heat storage module 23 is connected to the inlet of the heater 1. After the liquid heat storage medium 21 is heated, it enters the upper heat storage module 23 under the drive of the first drive pump 6. The liquid heat storage medium 21 flows from top to bottom, heating the two heat storage modules 23 in sequence until the temperature in both heat storage modules 23 rises to the specified temperature.

[0033] like Figure 1 As shown, the outlet of the water storage device 4 is connected to the inlet of the heat exchange tube section of the lower heat storage module 23, and the outlet of the heat exchange tube section of the upper heat storage module 23 is connected to the inlet of the stacked bed 3. Driven by the second drive pump 7, water in the water storage device 4 enters the heat exchange tube section of the lower heat storage module 23 and gradually flows upwards. During this process, the liquid water is heated into steam, which flows out from the outlet of the heat exchange tube section of the upper heat storage module 23 and enters the stacked bed 3.

[0034] Furthermore, the steam outlet of the stacked bed 3 is connected to the middle position of the heat exchange tube 22 inside the sensible heat storage device 2 to ensure that the liquid water or steam returning to the sensible heat storage device 2 can absorb heat when flowing through it. This is because the water flowing out of the water storage device 4 first absorbs the temperature of the downstream heat storage module 23 when entering the sensible heat storage device 2. Therefore, the temperature of the downstream heat storage module 23 drops faster than that of the upstream heat storage module 23, allowing the steam outlet of the stacked bed 3 to be connected to the middle position of the heat exchange tube 22 so that the return water or steam can flow through the upstream heat storage module 23, which still maintains a higher temperature, thereby absorbing heat and increasing its temperature.

[0035] As an example, such as Figure 1 As shown, the heat exchange tubes in the two heat storage modules 23 are connected end to end to form a heat exchange tube 22. The steam outlet of the bed 3 is connected to the inlet of the heat exchange tube in the upper heat storage module 23. Return water or steam that has not reached the specified temperature flows out of the bed 3 into the upper heat storage module 23 and flows along the heat exchange tube 22 towards the outlet. During this process, the return water or low-temperature steam is heated into high-temperature steam by the liquid heat storage medium 21. The high-temperature steam enters the bed 3 to continue heating the phase change material 31 in the bed 3 for heat storage, or it is further heated to superheated by the phase change material 31 in the bed 3.

[0036] Therefore, the sensible heat storage device 2 is equipped with multiple heat storage modules 23, and the sensible heat storage device 2 can perform step-by-step heating. In the later heat release stage, the sensible heat storage device 2 can achieve step-by-step heat release.

[0037] In some embodiments, the sensible heat storage device 2 includes a three-way valve 8, such as Figure 1 As shown, the three-way valve 8 includes a first inlet, a second inlet, and an outlet. The three-way valve 8 is installed in the heat exchange tube 22. The first inlet is connected to the upstream section of the heat exchange tube 22, the outlet is connected to the downstream section of the heat exchange tube 22, and the second inlet is connected to the steam outlet of the bed 3.

[0038] by Figure 1 Taking the illustrated embodiment as an example, the outlet of the three-way valve 8 is connected to the inlet of the heat exchange tube section of the upper heat storage module 23, the first inlet is connected to the outlet of the heat exchange tube section of the lower heat storage module 23 (i.e., the next-stage heat storage module 23), and the second inlet is connected to the steam outlet of the bed 3. Steam from the outlet of the lower heat storage module 23's heat exchange tube section enters the upper heat storage module 23's heat exchange tube section through the outlet of the three-way valve 8, and steam from the bed 3's steam outlet also enters the upper heat storage module 23's heat exchange tube section through the outlet of the three-way valve 8, flowing upwards to absorb heat.

[0039] In some embodiments, the stacked bed 3 is arranged vertically and includes a shell 32. At least one heat exchange cavity 33 is defined within the shell 32, and the heat exchange cavity 33 is filled with phase change spheres containing phase change material 31. The phase change spheres are stacked according to a certain pattern, forming interconnected gaps between them, allowing steam to flow through these gaps and exchange heat with the phase change spheres. The gaps can be adjusted according to the number, size, shape, and stacking method of the phase change spheres to ensure the required heat exchange area and flow resistance.

[0040] like Figure 2 As shown, the shell 32 further defines an upper chamber 36 located above the heat exchange cavity 33 and a lower chamber 37 located below the heat exchange cavity 33. An upper screen 34 is provided between the upper chamber 36 and the heat exchange cavity 33, and a lower screen 35 is provided between the lower chamber 37 and the heat exchange cavity 33. The upper screen 34 and lower screen 35 confine the phase change spheres within the heat exchange cavity 33. The inlet of the stacked bed 3 is located at the bottom and directly communicates with the lower chamber 37, while the steam outlet of the stacked bed 3 is located at the top and directly communicates with the upper chamber 36. Before entering or exiting the stacked bed 3, the steam is buffered in the lower chamber 37 or the upper chamber 36. Inside the stacked bed 3, the steam passes through the lower screen 35 to enter the heat exchange cavity 33 or flows out through the upper screen 34, achieving uniform distribution.

[0041] In some embodiments, the phase change point temperatures of the phase change materials 31 in different phase change spheres can be different. Phase change spheres filled with phase change materials 31 having different phase change point temperatures can be arranged in layers. From top to bottom, the phase change point temperature of the phase change materials 31 in each layer of phase change spheres gradually decreases, but all are higher than the specified steam temperature. The stacked bed 3 adopts a layered structure corresponding to different phase change points, which can be used in stages to improve the efficiency of the system and the utilization rate of energy.

[0042] In some embodiments, the thermal storage and steam supply system 100 further includes a temperature sensor (not shown in the figure) for measuring the steam temperature at the steam outlet of the stacked bed. If the steam temperature reaches a specified temperature, the steam enters the downstream equipment; if the steam temperature is lower than the specified temperature, the steam returns to the heat exchange tube.

[0043] The following is based on Figures 1-2 The operation method of the thermal storage and steam supply system 100 provided in the embodiments of the present invention is described in detail. The thermal storage and steam supply system 100 has a thermal storage stage and a thermal release stage.

[0044] During the thermal storage phase, electricity from renewable energy generation or off-peak electricity from the grid powers the heater 1. The first drive pump 6 is activated, and the liquid thermal storage medium 21 circulates between the heater 1 and the sensible thermal storage device 2. The liquid thermal storage medium 21 absorbs heat, raising its temperature to the required level. The second drive pump 7 is activated, and water from the water storage device 4 enters the heat exchange tube 22 from the bottom of the sensible thermal storage device 2 and flows upwards along the tube. During this process, the liquid water absorbs the heat stored in the sensible thermal storage device 2 and transforms into high-temperature steam. This high-temperature steam enters the stacked bed 3 from the inlet at the bottom, heating the phase change material 31 and raising its temperature. Thus, heat is stored in the sensible thermal storage device 2 and the stacked bed 3. The returned water flows back into the sensible thermal storage device 2 and reheats through the upper thermal storage module 23 via the three-way valve 8.

[0045] During the heat release phase, water in the water storage device 4 enters the sensible heat storage device 2 under the drive of the second drive pump 7. After absorbing heat, it undergoes a phase change transformation into high-temperature, highly saturated steam. The saturated steam enters the stacked bed 3, where it is further heated by the phase change material 31 to become superheated steam. This superheated steam, heated to a specified temperature, is supplied to industrial steam users. The heat load and temperature of the industrial steam users may differ, and consequently, the heat load and temperature within the chamber of the stacked bed 3 may also differ. If the steam temperature at the steam outlet of the stacked bed 3 does not reach the specified temperature, the steam returns to the sensible heat storage device 2 and flows through the three-way valve 8 through the upper heat storage module 23 for reheating. The reheated steam then re-enters the stacked bed 3 to absorb heat until the temperature at the steam outlet at the top of the stacked bed 3 reaches the specified temperature. This superheated steam, heated to the specified temperature, is then supplied to the industrial steam users.

[0046] The thermal storage and steam supply system provided in this invention can store heat and generate industrial steam, which can be supplied to industrial users or used for power generation. It can be combined with off-peak electricity utilization to reduce electricity costs, and can also be combined with new energy power generation to smooth power output fluctuations, thus improving power quality and safety. The thermal storage and steam supply system provided in this invention combines sensible heat storage and phase change heat storage to achieve precise control of the generated steam temperature. The system does not contain a heat exchanger, minimizing the footprint.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A thermal storage and steam supply system coupled with sensible heat storage and latent heat storage, characterized in that, include: The system includes a heater, a sensible heat storage device, a stockpiled bed, and a water storage device. The heater converts electrical energy into heat energy and is connected to the sensible heat storage device to store heat within it. The sensible heat storage device contains heat exchange tubes. The inlet of the heat exchange tubes is connected to the water storage device, and the outlet of the heat exchange tubes is connected to the inlet of the stockpiled bed. The stockpiled bed is filled with a phase change material, and the steam outlet of the stockpiled bed is connected to the heat exchange tubes and also to a steam user. The sensible heat storage device includes a shell, an internal cavity of which is filled with a liquid heat storage medium, a heater connected to the internal cavity of the shell to allow the liquid heat storage medium to circulate and absorb heat, and a heat exchange tube passing through the liquid heat storage medium. The sensible heat storage device includes several heat storage modules, each of which is equipped with a heat exchange tube segment. The heat exchange tube segments are connected end to end to form a heat exchange tube, and the liquid heat storage medium in each heat storage module is connected. The outlet of the heater is connected to the upstream heat storage module, and the inlet of the heater is connected to the downstream heat storage module. The steam outlet of the bed is connected to the middle of the heat exchange tube.

2. The thermal storage and steam supply system coupled with sensible heat storage and latent heat storage according to claim 1, characterized in that, The liquid heat storage medium is heat transfer oil or liquid molten salt.

3. The thermal storage and steam supply system coupled with sensible heat storage and latent heat storage according to claim 1, characterized in that, The outlet of the water storage device is connected to the heat exchange tube section of the downstream thermal storage module, and the inlet of the stacked bed is connected to the heat exchange tube section of the upstream thermal storage module.

4. The thermal storage and steam supply system coupled with sensible heat storage and latent heat storage according to claim 1, characterized in that, The sensible heat storage device includes a three-way valve, which includes a first inlet, a second inlet, and an outlet. The three-way valve is installed in the heat exchange tube. The first inlet is connected to the upstream section of the heat exchange tube, the outlet is connected to the downstream section of the heat exchange tube, and the second inlet is connected to the steam outlet of the bed.

5. The thermal storage and steam supply system coupled with sensible heat storage and latent heat storage according to claim 1, characterized in that, The bed includes a shell, within which a heat exchange cavity is defined. A phase change material is deposited in the heat exchange cavity. The phase change material is arranged in multiple layers from top to bottom. The phase change temperature of the phase change material in the upper layer is higher than that of the phase change material in the lower layer. The phase change temperature of the phase change material is higher than a specified temperature of the steam discharged from the bed.

6. The thermal storage and steam supply system coupled with sensible heat storage and latent heat storage according to claim 1 or 5, characterized in that, It also includes a temperature sensor, which is used to measure the steam temperature at the steam outlet of the stacked bed. If the steam temperature reaches a specified temperature, the steam enters the downstream equipment; if the steam temperature is lower than the specified temperature, the steam returns to the heat exchange tube.

7. An operation method for a thermal storage and steam supply system, characterized in that, The thermal storage and steam supply system is a coupled thermal storage and steam supply system based on sensible heat storage and latent heat storage according to any one of claims 1-6, the thermal storage and steam supply system having a heat storage stage and a heat release stage, and the operation method includes: During the thermal storage stage, new energy power generation or off-peak electricity from the grid provides power to the heater. The heater heats the liquid storage medium in the sensible heat storage device to a specified temperature. The water storage device delivers liquid water to the heat exchange tube. The liquid water absorbs heat and turns into high-temperature steam. The high-temperature steam enters the stacked bed, stores the heat in the stacked bed, and then returns to the heat exchange tube. During the heat release phase, the water storage device supplies liquid water to the heat exchange tube. The liquid water absorbs heat and becomes high-temperature saturated steam. The high-temperature saturated steam enters the stacked bed and is further heated into superheated steam. If the temperature of the superheated steam reaches the specified temperature, the superheated steam is supplied to the steam user. If the temperature of the superheated steam does not reach the specified temperature, it returns to the heat exchange tube to continue absorbing heat until the specified temperature is reached.

Images