Waste heat recovery, graphitization furnace waste heat recovery device, system and method

Abstract

This invention provides a waste heat recovery device, a graphitization furnace waste heat recovery apparatus, system, and method. The waste heat recovery device includes an outer sleeve, an inner sleeve, and a body with a cavity. A partition is provided within the body, dividing the cavity into an upper cavity and a lower cavity. The body has an outlet communicating with the upper cavity and a first inlet and a second inlet communicating with the lower cavity, respectively. One end of the outer sleeve passes through the body and the partition, communicating with the upper cavity, and the other end extends outward from the body. The inner sleeve is fitted inside the outer sleeve, forming a flow channel between them. One end of the inner sleeve extends outward from the outer sleeve, communicating with the lower cavity, and the other end communicates with the flow channel within the outer sleeve. This invention significantly accelerates heat dissipation efficiency, shortens the cooling cycle, and collects heat from the graphitization furnace in the form of high-temperature steam, thus recovering heat.

Description

Technical Field

[0001] This invention relates to the field of lithium battery anode material production technology, and in particular to a waste heat recovery device, a waste heat recovery apparatus, system and method for a graphitization furnace. Background Technology

[0002] Batteries, used in electric vehicles and battery energy storage systems, generally consist of positive electrode materials, negative electrode materials, separators, and electrolytes. With the rapid development of electric vehicles and battery energy storage, the current market demand for negative electrode materials is estimated at 1.5 million tons annually, and this demand continues to grow. In graphitization production, cooling time and workload account for over 90% of the entire graphitization production cycle; therefore, optimizing cooling efficiency can significantly shorten the production cycle and reduce workload.

[0003] Furthermore, energy consumption accounts for over 95% of the graphitization process cost. Depending on furnace size and structure, the electricity consumption per ton of product material reaches 4000-8000 kWh. Currently, the cooling of graphitization furnaces used in lithium battery anode material production primarily relies on accelerating the thinning or removal of the top insulation material to enhance top heat dissipation. This method involves first using a grab bucket to remove the top insulation material from the product material, then using a suction crane to remove the insulation material, and finally using air cooling to dissipate heat from the product material. Firstly, because top cooling cannot directly cool the product material, nor can it cool the side and bottom insulation material, the cooling efficiency is extremely low, typically requiring about 30 days. The larger the furnace size, the longer the cooling cycle, sometimes exceeding 40 days. Secondly, due to the initial... The insulation material reaches a temperature of 1000-2000℃, making it impossible for the suction crane to pick it up. Only a grab bucket can be used to grab it. During the grabbing process, the insulation material forms a hot airflow at high temperature, which will spray upwards, causing a large amount of dust in the workshop, affecting the working environment, and causing personnel safety accidents. Thirdly, the suction crane needs to remove the insulation material on top of the product material layer by layer, generally picking up 50-100mm at a time (cooling one layer and picking up another). The entire insulation layer needs to be picked up in 10-20 times, continuously picking up for 7-10 days, which is labor-intensive and has high operational risks. Fourthly, the heat of the insulation material and the product material is completely dissipated into the air, resulting in great waste. Summary of the Invention

[0004] The purpose of this invention is to provide a waste heat recovery device, a waste heat recovery system, and a method for graphitization furnaces, in order to overcome the problems of long production cycles, low production efficiency, high production costs, significant environmental pollution, high work intensity, and high work hazards in graphitization.

[0005] The technical solution of the present invention is: a waste heat recovery device, comprising an outer sleeve, an inner sleeve, and a body having a cavity. A partition is provided inside the body, dividing the cavity into an upper cavity and a lower cavity. The body has an outlet communicating with the upper cavity and a first inlet and a second inlet communicating with the lower cavity, respectively. One end of the outer sleeve passes through the body and the partition and communicates with the upper cavity, while the other end of the outer sleeve extends outward from the outside of the body. The inner sleeve is fitted inside the outer sleeve, forming a flow channel between the inner sleeve and the outer sleeve. One end of the inner sleeve extends outward from the outside of the outer sleeve and communicates with the lower cavity, while the other end of the inner sleeve communicates with the flow channel within the outer sleeve.

[0006] Preferably, the end of the outer sleeve extending outside the body is a cone.

[0007] Preferably, the partition is provided with multiple exchange ports, which connect the upper cavity and the lower cavity.

[0008] Preferably, the body is olive-shaped, and multiple outer and inner sleeves are arranged in a rectangular array on the body.

[0009] The present invention also provides a waste heat recovery device for a graphitization furnace, including a graphitization furnace, a support frame, and the aforementioned waste heat recovery device mounted on the support frame. The support frame is mounted above the graphitization furnace, and the waste heat recovery device is displaced vertically toward the graphitization furnace via the support frame, so that the outer sleeve is inserted into or removed from the graphitization furnace.

[0010] Preferably, the support frame includes a gantry frame, an installation frame disposed within the gantry frame, and a drive mechanism for driving the installation frame to move up and down along the gantry frame. The waste heat recovery unit is installed on the installation frame, the outer sleeve extends downward outward from the outside of the installation frame, and the gantry frame is installed on the graphitization furnace.

[0011] Preferably, the gantry frame includes two spaced-apart vertical frames and a horizontal frame connected between the tops of the two vertical frames; the drive mechanism includes a drive shaft, a motor, an upper sprocket, a chain, and a lower sprocket. The upper sprocket is mounted at both ends of the horizontal frame, and the lower sprocket is rotatably connected to the bottom of the vertical frame. The upper and lower sprockets are connected by a chain. The mounting frame is connected to the chain, the drive shaft connects to the two upper sprockets, and the motor is connected to the drive shaft; the vertical frame is mounted on a graphitization furnace.

[0012] The mounting frame is provided with guide mechanisms on both sides. The guide mechanisms include a hinge shaft rotatably connected to the mounting frame, a rotating plate fixed to the hinge shaft, and guide wheels hinged to the upper and lower ends of the rotating plate. The guide wheels slide in contact with the outer side of the upright frame.

[0013] Preferably, the graphitization furnace has a groove, in which product material and insulating material covering the outer periphery of the product material are disposed, and the outer sleeve is inserted into the product material and simultaneously contacts the insulating material and the product material.

[0014] The present invention also provides a graphitization furnace waste heat recovery system, including a heat exchanger, a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, a steam generator, the aforementioned graphitization furnace waste heat recovery device, a steam turbine and / or a heat source. The outlet and first inlet of the waste heat recovery device are respectively connected to the heat exchanger. The heat exchanger is also respectively connected to the high-temperature molten salt storage tank and the low-temperature molten salt storage tank. The high-temperature molten salt storage tank and the low-temperature molten salt storage tank are respectively connected to the steam generator. The steam generator is connected to the steam turbine or the heat source.

[0015] The present invention also provides a method for recovering waste heat from a graphitization furnace, which uses the above-mentioned waste heat recovery system for a graphitization furnace and includes the following steps: injecting cold water into the lower cavity from the second inlet, wherein the cold water enters the inner sleeve and flows into the flow channel;

[0016] The waste heat recovery unit mounted on the support frame is driven to move downward, so that the outer tube is inserted into the graphitization furnace to contact the insulation material and the product material to obtain high temperature; the high temperature heats the cold water in the flow channel to generate high temperature steam, which enters the upper chamber and then flows out from the outlet into the heat exchanger; the heat exchanger exchanges heat with the high temperature steam, and at the same time, the molten salt in the low temperature molten salt storage tank is heated by the heat exchanger and enters the high temperature molten salt storage tank. The low temperature steam after the exchange enters the lower chamber from the first inlet;

[0017] After entering the steam generator from the high-temperature molten salt storage tank, the high-temperature molten salt flows back to the low-temperature molten salt storage tank. During this process, the steam in the steam generator is used for the steam turbine or the heat source respectively; the low-temperature steam generated by the steam turbine or the heat source returns to the steam generator.

[0018] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0019] 1. The waste heat recovery unit is installed on the support frame and moves up and down with the support frame. When the waste heat recovery unit moves downward, the outer tube can be inserted into the high-temperature product material to extract heat, and then generate high-temperature steam to be sent to the steam turbine or heat source to realize the recovery and reuse of waste heat. On the one hand, it greatly accelerates the heat dissipation efficiency and shortens the cooling cycle, reducing the entire production cycle by more than 50%. On the other hand, it collects 45%-60% of the heat in the graphitization furnace in the form of high-temperature steam, which can be used for power generation and as other heat sources, thus recovering heat and reducing production costs by about 30%.

[0020] Second, the outer tube is inserted into the insulation material and the product material at the same time, which can cool the insulation material and the product material to room temperature at one time. Then, the insulation material and the product material are picked up by the suction crane. Due to the low temperature, continuous operation is possible, and it can generally be completed within 12 hours. Therefore, the risks of high temperature operation and dust problems are avoided, and the labor intensity is also reduced.

[0021] Third, the waste heat recovery reaches 45%-60% of the electricity delivered, reducing production costs by about 30%; it reduces environmental pollution and can basically eliminate dust pollution in graphitization production; it also significantly reduces work intensity and work hazards. Attached Figure Description

[0022] Figure 1 A three-dimensional and partially cross-sectional structural schematic diagram of the waste heat recovery device provided by the present invention;

[0023] Figure 2 A cross-sectional schematic diagram of the waste heat recovery device provided by the present invention;

[0024] Figure 3 A schematic diagram of the structure of the graphitization furnace waste heat recovery device provided by the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the installation of a support frame and a waste heat recovery unit;

[0026] Figure 5 This is a structural schematic diagram of the support frame;

[0027] Figure 6 This is a schematic diagram of the waste heat recovery unit before heat extraction.

[0028] Figure 7 A schematic diagram of a waste heat recovery unit extracting heat.

[0029] Figure 8 This is a schematic diagram of the waste heat recovery system for a graphitization furnace provided by the present invention.

[0030] In the attached diagram: 1. Waste heat recovery unit; 11. Main body; 111. Cavity; 12. Outer sleeve; 121. Cone head; 13. Inner sleeve; 14. Baffle plate; 141. Exchange port; 15. Upper cavity; 16. Lower cavity; 17. Outlet; 18. First inlet; 19. Second inlet; 101. Flow channel; 2. Support frame; 21. Gantry frame; 211. Vertical frame; 212. Horizontal frame; 22. Mounting frame; 23. Drive. Mechanism; 231, drive shaft; 232, motor; 233, upper sprocket; 234, chain; 235, lower sprocket; 24, guide mechanism; 241, hinge shaft; 242, rotating plate; 243, guide wheel; 3, graphitization furnace; 31, groove; 32, product material; 33, insulation material; 4, heat exchanger; 5, high-temperature molten salt storage tank; 6, low-temperature molten salt storage tank; 7, steam generator; 8, steam turbine; 9, heat source. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0032] like Figure 1 , Figure 2 As shown, the waste heat recovery device 1 provided in this embodiment includes a body 11, an outer sleeve 12, an inner sleeve 13, a partition 14, an upper cavity 15, a lower cavity 16, an outlet 17, a first inlet 18, a second inlet 19, and a flow channel 101.

[0033] The main body 11 is a closed olive shape, with an internal cavity 111. A partition 14 is horizontally arranged inside the main body 11, dividing the cavity 111 into an upper cavity 15 and a lower cavity 16. A plurality of exchange ports 141 are arranged on the partition 14, which connect the upper cavity 15 and the lower cavity 16.

[0034] The main body 11 is provided with an outlet 17 communicating with the upper cavity 15. The main body 11 is provided with a first inlet 18 and a second inlet 19 communicating with the lower cavity 16 respectively. The outlet 17 and the first inlet 18 are located at the top of the main body 11, and the first inlet 18 passes through the partition 14 and communicates with the lower cavity 16. The second inlet 19 is located at one end of the main body 11.

[0035] Multiple outer sleeves 12 and inner sleeves 13 are arranged in a rectangular array on the body 11. The upper end of the outer sleeve 12 passes through the body 11 and the partition 14 and communicates with the upper cavity 15. The lower end of the outer sleeve 12 extends out of the outside of the body 11 and is provided with a cone head 121 at the lower end of the outer sleeve 12. The inner sleeve 13 is fitted into the outer sleeve 12, and a flow channel 101 is formed between the inner sleeve 13 and the outer sleeve 12. The upper end of the inner sleeve 13 extends horizontally out of the outside of the outer sleeve 12 near the second inlet 19 and communicates with the lower cavity 16. The lower end of the inner sleeve 13 communicates with the flow channel 101 in the outer sleeve 12.

[0036] The high-low temperature steam baffle divides the waste heat recovery unit into upper and lower chambers. High-temperature steam exits from the outer casing 12 and enters the upper chamber, then flows out through the outlet. After the high-temperature steam passes through the heat exchanger and loses heat, it flows into the lower chamber through the low-temperature steam inlet. The lower chamber also stores a certain amount of cooling water. The high-low temperature steam baffle isolates the high-temperature and low-temperature steam, preventing low-temperature steam from entering the chamber and flowing directly out through the high-temperature steam outlet. The baffle has high-low temperature steam exchange ports for slow exchange between the two steam systems, maintaining a consistent pressure difference and ensuring internal self-circulation of the cooling water (the water between the inner and outer casings is heated to form steam that rises, driving the water in the inner casing to flow automatically inward).

[0037] like Figure 3 As shown, the present invention also provides a waste heat recovery device for a graphitization furnace, including a support frame 2, a graphitization furnace 3, and the aforementioned waste heat recovery device 1. Multiple support frames 2 are mounted on the graphitization furnace 3, and at least one waste heat recovery device 1 is mounted on each support frame 2.

[0038] like Figure 4 , Figure 5 As shown, the support frame 2 includes a gantry frame 21, a mounting frame 22, a drive mechanism 23, and a guide mechanism 24.

[0039] The gantry frame 21 includes two spaced-apart vertical frames 211 and a horizontal frame 212 connecting the tops of the two vertical frames 211. The vertical frames 211 are mounted on the graphitization furnace 3.

[0040] The drive mechanism 23 includes a drive shaft 231, a motor 232, an upper sprocket 233, a chain 234, and a lower sprocket 235. The upper sprocket 233 is mounted at both ends of the horizontal frame 212, and the lower sprocket 235 is rotatably connected to the bottom of the vertical frame 211. The upper sprocket 233 and the lower sprocket 235 are connected by the chain 234. The mounting frame 22 is connected to the chain 234 and moves up and down with the chain 234. The drive shaft 231 connects the two upper sprockets 233, and the motor 232 (including a reducer) is connected to the drive shaft 231.

[0041] The waste heat recovery unit 1 is mounted on the mounting frame 22, and the outer sleeve 12 extends downwards outwards from the outside of the mounting frame 22.

[0042] The mounting frame 22 is provided with guide mechanisms 24 on both sides. Each guide mechanism 24 includes a hinge shaft 241 rotatably connected to the mounting frame 22, a rotating plate 242 fixed to the hinge shaft 241, and guide wheels 243 hinged to the upper and lower ends of the rotating plate 242. The guide wheels 243 slide in contact with the outer surface of the upright frame 211. The axis of the hinge shaft 241 is located in the middle of the line connecting the two guide wheels 243. The two guide wheels 243 maintain contact with the outer surface of the upright frame 211 through the hinge shaft 241, resulting in better shape adaptation and smoother sliding.

[0043] like Figure 3 , Figure 6 As shown, the graphitization furnace 3 has a groove 31 inside, and the groove 31 contains product material 32 and insulating material 33 covering the outer periphery of the product material 32. Figure 7 As shown, when the outer sleeve 12 is inserted into the product material 32, it is in contact with both the insulation material 33 and the product material 32, and can simultaneously obtain heat from both materials to achieve simultaneous heat dissipation.

[0044] like Figure 8 As shown, the present invention also provides a waste heat recovery system for a graphitization furnace, including a heat exchanger 4, a high-temperature molten salt storage tank 5, a low-temperature molten salt storage tank 6, a steam generator 7, a steam turbine 8, and / or a heat source 9. The outlet 17 and the first inlet 18 of the waste heat recovery unit 1 are respectively connected to the heat exchanger 4. The heat exchanger 4 is also connected to both the high-temperature molten salt storage tank 5 and the low-temperature molten salt storage tank 6. The high-temperature molten salt storage tank 5 and the low-temperature molten salt storage tank 6 are respectively connected to the steam generator 7, and the steam generator 7 is connected to either the steam turbine 8 or the heat source 9. The heat source 9 is equipment that requires heat, such as for drying, granulation, or pre-carbonization.

[0045] The present invention also provides a method for recovering waste heat from a graphitization furnace, which uses the above-mentioned waste heat recovery system for a graphitization furnace and includes the following steps:

[0046] Cold water is injected into the lower cavity 16 through the second inlet 19. The cold water enters the inner sleeve 13 and flows into the flow channel 101. The drive mechanism 23 is activated, driving the mounting frame 22 and the waste heat recovery unit 1 on it to move downward, so that the outer sleeve 12 is inserted into the graphitization furnace 3 and comes into contact with the insulation material 33 and the product material 32 (e.g., Figure 7 As shown, high temperature is obtained. This high temperature heats the cold water in the flow channel 101 to generate high-temperature steam. The high-temperature steam enters the upper chamber 15 and then flows out from the outlet 17 into the heat exchanger 4. The heat exchanger 4 exchanges heat with the high-temperature steam. At the same time, the molten salt in the low-temperature molten salt storage tank 6 is heated by the heat exchanger 4 and enters the high-temperature molten salt storage tank 5. The exchanged low-temperature steam enters the lower chamber 16 from the first inlet 18. The high-temperature molten salt enters the steam generator 7 from the high-temperature molten salt storage tank 5 and then flows back to the low-temperature molten salt storage tank 6. During this process, the steam in the steam generator 7 is used for the steam turbine 8 or the heat source 9. The low-temperature steam generated by the steam turbine 8 or the heat source 9 returns to the steam generator 7. This forms a complete heat extraction cycle.

[0047] After the product material 32 and the insulation material 33 have completely cooled, the drive mechanism 23 is restarted to move the mounting frame 22 and the waste heat recovery unit 1 on it upwards until the outer casing 12 is pulled out above the graphitization furnace 3 (e.g., Figure 6 As shown in the figure, the waste heat recovery of the graphitization furnace is completed.

[0048] The above-mentioned recycling process operates in a low-temperature environment and can be completed continuously, which greatly improves cooling efficiency, enables continuous production operations, avoids dust generation, and transfers waste heat to the energy storage station as a heat source for other equipment through high-temperature steam, significantly reducing production costs.

[0049] The waste heat recovery unit 1 of this invention is mounted on the mounting frame 22 and can move up and down with the mounting frame 22. When the waste heat recovery unit 1 moves downward, the outer casing 12 can be inserted into the product material 32 and the insulation material 33 to extract heat, which greatly accelerates the heat dissipation efficiency of the high-temperature product material 32 and the insulation material 33 and shortens the cooling cycle. The cooling water between the flow channels 101 is heated to form high-temperature steam, which is sent to the heat exchanger 4 through the outlet 17. After heat exchange with the high-temperature steam, the low-temperature steam returns to the lower chamber 16 through the first inlet 18. The molten salt in the low-temperature molten salt storage tank 6 is heated when it passes through the heat exchanger 4 and then enters the high-temperature molten salt storage tank 5. The high-temperature molten salt flows back to the low-temperature molten salt storage tank 6 after passing through the steam generator 7. Part of the steam generated by the steam generator 7 is used for the steam turbine and generator, and the other part is used for other heat sources (such as equipment that requires heat, such as material drying, granulation, pre-carbonization, etc.). The cold steam then returns to the steam generator. In this way, 45%-60% of the heat in the graphitization furnace is collected in the form of high-temperature steam and used for power generation and as other heat sources, thus recovering heat and reducing production costs by about 30%.

[0050] Since the waste heat recovery unit 1 can cool the product material 32 and the insulation material 33 to room temperature in one go, the cooling time is only 12 hours, thus avoiding the risk of high temperature operation of the suction crane and grab bucket, and solving the dust problem.

[0051] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A waste heat recovery device, characterized in that, The device includes an outer sleeve, an inner sleeve, and a body with a cavity. The body has a partition that divides the cavity into an upper cavity and a lower cavity. The body has an outlet communicating with the upper cavity and a first inlet and a second inlet communicating with the lower cavity, respectively. One end of the outer sleeve passes through the body and the partition and communicates with the upper cavity, while the other end of the outer sleeve extends out of the body. The inner sleeve is fitted inside the outer sleeve, and a flow channel is formed between the inner sleeve and the outer sleeve. One end of the inner sleeve extends out of the outer sleeve and communicates with the lower cavity, while the other end of the inner sleeve communicates with the flow channel inside the outer sleeve.

2. The waste heat recovery device according to claim 1, characterized in that, The outer sleeve extends outward from the body at a cone-shaped end.

3. The waste heat recovery device according to claim 1, characterized in that, The partition is provided with multiple exchange ports, which connect the upper cavity and the lower cavity.

4. The waste heat recovery device according to claim 1, characterized in that, The main body is olive-shaped, and multiple outer and inner sleeves are arranged in a rectangular array on the main body.

5. A waste heat recovery device for a graphitization furnace, comprising a graphitization furnace, characterized in that, It also includes a support frame and a waste heat recovery unit as described in any one of claims 1-4, mounted on the support frame, the support frame being mounted above the graphitization furnace, and the waste heat recovery unit being displaced vertically toward the graphitization furnace via the support frame, so that the outer casing is inserted into or removed from the graphitization furnace.

6. The waste heat recovery device for graphitization furnace according to claim 5, characterized in that, The support frame includes a gantry frame, an installation frame disposed within the gantry frame, and a drive mechanism for driving the installation frame to move up and down along the gantry frame. The waste heat recovery unit is installed on the installation frame, and the outer sleeve extends downward outward from the outside of the installation frame. The gantry frame is installed on the graphitization furnace.

7. The waste heat recovery device for graphitization furnace according to claim 6, characterized in that, The gantry frame includes two spaced-apart vertical frames and a horizontal frame connected between the tops of the two vertical frames; the drive mechanism includes a drive shaft, a motor, an upper sprocket, a chain, and a lower sprocket. The upper sprocket is mounted at both ends of the horizontal frame, and the lower sprocket is rotatably connected to the bottom of the vertical frame. The upper and lower sprockets are connected by a chain. The mounting frame is connected to the chain, the drive shaft connects the two upper sprockets, and the motor is connected to the drive shaft; the vertical frame is mounted on a graphitization furnace. The mounting frame is provided with guide mechanisms on both sides. The guide mechanism includes a hinge shaft rotatably connected to the mounting frame, a rotating plate fixed to the hinge shaft, and guide wheels hinged to the upper and lower ends of the rotating plate. The guide wheels slide in contact with the outer side of the upright frame.

8. The waste heat recovery device for graphitization furnace according to claim 5, characterized in that, The graphitization furnace has a groove inside, in which product material and insulation material covering the outer periphery of the product material are placed. The outer tube is inserted into the product material and simultaneously contacts the insulation material and the product material.

9. A waste heat recovery system for a graphitization furnace, characterized in that, The device includes a heat exchanger, a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, a steam generator, a graphitization furnace waste heat recovery device as described in any one of claims 5-8, a steam turbine, and / or a heat source. The outlet and first inlet of the waste heat recovery device are respectively connected to the heat exchanger. The heat exchanger is also respectively connected to the high-temperature molten salt storage tank and the low-temperature molten salt storage tank. The high-temperature molten salt storage tank and the low-temperature molten salt storage tank are respectively connected to the steam generator. The steam generator is connected to the steam turbine or the heat source.

10. A method for recovering waste heat from a graphitization furnace, comprising using the waste heat recovery system for a graphitization furnace as described in claim 9, characterized in that... include: Cold water is injected into the lower cavity from the second inlet, and the cold water enters the inner sleeve and flows into the flow channel; The waste heat recovery unit mounted on the support frame is driven to move downward, so that the outer tube is inserted into the graphitization furnace to contact the insulation material and the product material to obtain high temperature; the high temperature heats the cold water in the flow channel to generate high temperature steam, which enters the upper chamber and then flows out from the outlet into the heat exchanger; the heat exchanger exchanges heat with the high temperature steam, and at the same time, the molten salt in the low temperature molten salt storage tank is heated by the heat exchanger and enters the high temperature molten salt storage tank. The low temperature steam after the exchange enters the lower chamber from the first inlet; After entering the steam generator from the high-temperature molten salt storage tank, the high-temperature molten salt flows back to the low-temperature molten salt storage tank. During this process, the steam in the steam generator is used for the steam turbine or the heat source respectively; the low-temperature steam generated by the steam turbine or the heat source returns to the steam generator.

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