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

Abstract

Provided in the present invention are a waste heat recovery device, and a graphitization furnace waste heat recovery apparatus, system and method. The waste heat recovery device comprises heat extraction tubes and a body having an accommodating cavity, wherein a partition plate is provided in the body, the partition plate dividing the accommodating cavity into a high-temperature cavity and a low-temperature cavity; the heat extraction tubes are mounted on the body, and the inside of each heat extraction tube is provided with a second flow channel and a first flow channel located outside the second flow channel, the first flow channel being in communication with the second flow channel; the body is provided with an outlet, a first inlet and a second inlet; each heat extraction tube is provided with a water inlet and a steam outlet, the water inlet communicating the second flow channel with the low-temperature cavity, and the steam outlet communicating the first flow channel with the high-temperature cavity; and the heat extraction tubes extend out of the body to form heat extraction ends. The present invention greatly improves heat dissipation efficiency, shortens the cooling cycle, and collects heat from the inside of a graphitization furnace in the form of high-temperature steam, thereby achieving heat recovery.

Description

Waste heat recovery device, system and method for graphitization furnace TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium negative electrode material production, and particularly relates to a waste heat recovery device, system and method for a graphitization furnace. BACKGROUND

[0002] A battery, as an electric vehicle and a battery energy storage system, generally mainly includes a positive electrode material, a negative electrode material, a separator, an electrolyte and the like. With the rapid development of electric vehicles and battery energy storage, the market demand for negative electrode materials is expected to be 1.5 million tons per year, and the market demand is increasing. In the production of graphitization, the cooling time and the work amount account for more than 90% of the entire graphitization production cycle, therefore, optimizing the cooling efficiency can greatly reduce the production cycle and reduce the work amount.

[0003] In addition, the energy consumption cost of graphitization accounts for more than 95% of the graphitization process, and the power consumption of a single ton of product material reaches 4000-8000kwh according to the size and mechanism difference of the furnace. At present, the cooling of the graphitization furnace for lithium battery negative electrode material production mainly adopts the method of accelerating thinning or removing the top heat preservation material to strengthen the top heat dissipation. This method is to first use a grab bucket to grab the heat preservation material on the top of the graphitization furnace, so that the heat preservation material on the top is separated from the product material, and then a material suction crane is used to suck the heat preservation material, and the product material is cooled by air cooling. First, the top heat dissipation method cannot directly cool the product material, nor can it cool the heat preservation material on the side and bottom, resulting in very low cooling efficiency. Generally, the cooling cycle needs about 30 days, especially the larger the size of the furnace, the longer the cooling cycle, and some cooling cycles even exceed 40 days. Second, because the temperature of the heat preservation material reaches 1000-2000℃ in the early stage, the material suction crane cannot suck it, and only the grab bucket can be used for grabbing. When grabbing, the heat preservation material forms a hot air flow at high temperature and is sprayed upward, resulting in a large amount of dust in the workshop, affecting the working environment, and causing personnel safety accidents. Third, the material suction crane needs to suck the heat preservation material on the top of the product material layer by layer, generally 50-100mm each time (cooling one layer and sucking one layer), and the entire heat preservation layer needs to be sucked for 10-20 times, and the continuous sucking lasts for 7-10 days, which has high labor intensity and high operation risk. Fourth, the heat of the heat preservation material and the product material is all dissipated in the air, causing great waste. SUMMARY

[0004] The present application aims to provide a waste heat recovery device, system and method for a graphitization furnace, to overcome the problems of long graphitization production cycle, low production efficiency, high production cost, large environmental pollution, high operation intensity and high operation risk.

[0005] The technical scheme of the present application is: a waste heat recovery device, comprising a heat extraction pipe and a body with a cavity, a partition plate is arranged in the body, the partition plate divides the cavity into a high-temperature cavity and a low-temperature cavity, the heat extraction pipe is installed on the body, a second flow channel is arranged in the heat extraction pipe, and a first flow channel is arranged outside the second flow channel, the first flow channel and the second flow channel are communicated, an outlet for discharging high-temperature steam is arranged on the body and communicated with the high-temperature cavity, a first inlet for injecting cold water into the low-temperature cavity and a second inlet for injecting low-temperature steam into the low-temperature cavity are respectively arranged on the body and communicated with the low-temperature cavity, a water inlet and a steam outlet are respectively arranged on the heat extraction pipe, the water inlet is communicated with the second flow channel and the low-temperature cavity, the steam outlet is communicated with the first flow channel and the high-temperature cavity, and the heat extraction pipe extends from the body to form a heat extraction end.

[0006] Preferably, the heat extraction pipe comprises an outer sleeve and an inner sleeve, the inner sleeve is arranged in the outer sleeve, the inner sleeve forms the second flow channel in the inner sleeve, the first flow channel is formed between the inner sleeve and the outer sleeve, the upper end of the inner sleeve penetrates the outer side of the outer sleeve to form the water inlet, the lower end of the inner sleeve is open to communicate the second flow channel and the first flow channel, the upper end of the outer sleeve penetrates the partition plate to form the steam outlet, and the lower end of the outer sleeve forms the heat extraction end.

[0007] Preferably, the heat extraction end is a tapered head. It can quickly enter the graphitization furnace in an inserted manner to contact the heat preservation material and the product material

[0008] Preferably, a plurality of exchange ports for achieving consistent pressure difference between upper and lower parts through exchange are arranged on the partition plate, and the exchange ports communicate the high-temperature cavity and the low-temperature cavity. The exchange ports are used for slow exchange of high-temperature steam and low-temperature steam, maintaining consistent pressure difference between upper and lower parts, so as to ensure internal self-circulation of the cooling water.

[0009] Preferably, the body is olive-shaped, and a plurality of outer sleeves and inner sleeves are arranged in a rectangular array on the body. The olive-shaped body is beneficial to installation on the support frame, balanced stress, and division of the inner cavity and cold and hot reaction.

[0010] The present application also provides a waste heat recovery device of a graphitization furnace, comprising a graphitization furnace, a support frame and the above-mentioned waste heat recovery device installed on the support frame, the support frame is used for driving the waste heat recovery device to act, so that the heat extraction pipe of the waste heat recovery device contacts or separates from the graphitization furnace.

[0011] Preferably, the support frame comprises a portal frame, a mounting frame arranged in the portal frame, and a driving mechanism for driving the mounting frame to move up and down along the portal frame, the waste heat recovery device is mounted on the mounting frame, the heat extraction pipe extends outward from the mounting frame, and the portal frame is mounted on the graphitization furnace.

[0012] Preferably, the portal frame comprises two vertically arranged vertical frames and a horizontal frame connected between the top portions of the two vertical frames; the driving mechanism comprises a transmission shaft, a motor, an upper chain wheel, a chain, and a lower chain wheel, the upper chain wheel is mounted at the two ends of the horizontal frame, the lower chain wheel is rotatably connected to the bottom of the vertical frame, the chain is connected between the upper chain wheel and the lower chain wheel, the mounting frame is connected to the chain, the transmission shaft is connected to the two upper chain wheels, and the motor is connected to the transmission shaft; and the vertical frame is mounted on the graphitization furnace.

[0013] Both sides of the mounting frame are provided with a guide mechanism, the guide mechanism comprises a hinge shaft rotatably connected to the mounting frame, a rotating plate fixed to the hinge shaft, and guide wheels hingedly connected to the upper and lower ends of the rotating plate, and the guide wheels are in sliding contact with the outer side surface of the vertical frame.

[0014] Preferably, the graphitization furnace is provided with a groove, the groove is provided with product material and heat preservation material wrapped around the outer periphery of the product material, and the heat extraction pipe is inserted into the product material and simultaneously in contact with the heat preservation material and the product material.

[0015] The application also provides a graphitization furnace waste heat recovery system, which comprises a heat exchanger, a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, a steam generator, the above-mentioned graphitization furnace waste heat recovery device, a steam turbine, and / or a heat source, the outlet and the first inlet of the waste heat recovery device are in communication with the heat exchanger, the heat exchanger is in communication with 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 in communication with the steam generator, and the steam generator is in communication with the steam turbine or the heat source.

[0016] The application also provides a graphitization furnace waste heat recovery method, which is performed by using the above-mentioned graphitization furnace waste heat recovery system, and comprises the following steps: injecting cold water into the low-temperature cavity from the second inlet, and the cold water flows into the first flow channel from the second flow channel through the water inlet.

[0017] The waste heat recovery device is installed on the support frame and moves up and down with the support frame, when the waste heat recovery device moves downward, the outer sleeve pipe can be inserted into the high-temperature product material to take heat, and then high-temperature steam is generated and sent to a steam turbine or a heat source to realize waste heat recovery and recycling, on the one hand, the heat dissipation efficiency is greatly accelerated, the cooling period is shortened, and the entire production cycle is reduced by more than 50%; on the other hand, 45%-60% of the heat in the graphitization furnace is collected in the form of high-temperature steam and can be used for power generation and as other heat sources, the heat is recovered, and the production cost is reduced by about 30%;

[0018] The high-temperature molten salt flows back to the low-temperature molten salt storage tank from the high-temperature molten salt storage tank after entering the steam generator, and in this process, the steam in the steam generator is used for a steam turbine or a heat source respectively; the low-temperature steam formed through the steam turbine or the heat source returns to the steam generator.

[0019] Compared with the related art, the present application has the following beneficial effects:

[0020] I. The waste heat recovery device is installed on the support frame and moves up and down with the support frame, when the waste heat recovery device moves downward, the outer sleeve pipe can be inserted into the high-temperature product material to take heat, and then high-temperature steam is generated and sent to a steam turbine or a heat source to realize waste heat recovery and recycling, on the one hand, the heat dissipation efficiency is greatly accelerated, the cooling period is shortened, and the entire production cycle is reduced by more than 50%; on the other hand, 45%-60% of the heat in the graphitization furnace is collected in the form of high-temperature steam and can be used for power generation and as other heat sources, the heat is recovered, and the production cost is reduced by about 30%;

[0021] II. The outer sleeve pipe is inserted into the heat preservation material and the product material at the same time, which can cool the heat preservation material and the product material to room temperature at one time, and then the heat preservation material and the product material are sucked by the material suction trolley, since the temperature is low, continuous operation can be realized, which can be completed within 12 hours in general, so that the risk of high-temperature operation and the dust problem are avoided, and the labor intensity is reduced;

[0022] III. The waste heat recovery heat reaches 45%-60% of the power transmission amount, the production cost is reduced by about 30%, the environmental pollution is reduced, the dust pollution in the graphitization production can be basically eliminated, the operation intensity is greatly reduced, and the operation danger is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a structure schematic diagram of the waste heat recovery device provided by the present application;

[0024] Fig. 2 is a sectional view of the waste heat recovery device provided by the present application;

[0025] Fig. 3 is a structure schematic diagram of the waste heat recovery device of the graphitization furnace provided by the present application;

[0026] Fig. 4 is an installation schematic diagram of one support frame and the waste heat recovery device in Fig. 3.

[0027] Fig. 5 is a structural schematic diagram of a support frame;

[0028] Fig. 6 is a schematic diagram of a waste heat recovery device before heat extraction;

[0029] Fig. 7 is a schematic diagram of a waste heat recovery device during heat extraction;

[0030] Fig. 8 is a structural schematic diagram of a waste heat recovery system of a graphitization furnace provided by the present application.

[0031] In the drawings: 1, waste heat recovery device; 11, body; 111, cavity; 10, heat extraction pipe; 101, first flow channel; 102, second flow channel; 103, water inlet; 104, steam outlet; 12, outer sleeve; 121, tapered head; 13, inner sleeve; 14, partition; 141, exchange port; 15, high-temperature cavity; 16, low-temperature cavity; 17, outlet; 18, first inlet; 19, second inlet; 2, support frame; 21, gantry frame; 211, vertical frame; 212, horizontal frame; 22, mounting frame; 23, driving mechanism; 231, transmission shaft; 232, motor; 233, upper sprocket; 234, chain; 235, lower sprocket; 24, guide mechanism; 241, hinged shaft; 242, rotating plate; 243, guide wheel; 3, graphitization furnace; 31, groove; 32, product material; 33, heat preservation 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 DESCRIPTION

[0032] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. For the sake of description, if the terms “up”, “down”, “left”, “right” appear in the following, they only mean consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. EMBODIMENT

[0033] As shown in Figs. 1 and 2, a waste heat recovery device 1 provided by the present embodiment includes a body 11, a heat extraction pipe 10, a partition 14, a high-temperature cavity 15, a low-temperature cavity 16, an outlet 17, a first inlet 18 and a second inlet 19. In the present embodiment, the heat extraction pipe 10 includes an outer sleeve 12 and an inner sleeve 13.

[0034] The body 11 is a closed olive type, and a cavity 111 is arranged inside. The partition 14 is arranged horizontally in the body 11, and the partition 14 divides the cavity 111 into the high-temperature cavity 15 and the low-temperature cavity 16. A plurality of exchange ports 141 are arranged on the partition 14, and the exchange ports 141 communicate the high-temperature cavity 15 and the low-temperature cavity 16.

[0035] The body 11 is provided with an outlet 17 communicating with the high-temperature cavity 15. The body 11 is provided with a first inlet 18 and a second inlet 19 respectively communicating with the low-temperature cavity 16. The outlet 17 and the first inlet 18 are located at the top of the body 11, and the first inlet 18 communicates with the low-temperature cavity 16 through the partition plate 14. The second inlet 19 is located at one end of the body 11.

[0036] The outer sleeve 12 and the inner sleeve 13 are arranged in a rectangular array on the body 11. The upper end of the outer sleeve 12 is provided with a steam outlet 104. The upper end of the outer sleeve 12 penetrates through the body 11 and the partition plate 14, so that the steam outlet 104 communicates with the high-temperature cavity 15. The lower end of the outer sleeve 12 extends out of the body 11 to form a heat extraction end, which is a tapered head 121 capable of quickly entering the graphitization furnace in an inserted manner to contact the heat preservation material and the product material. The inner sleeve 13 is sleeved in the outer sleeve 12, and the inner sleeve 13 is provided with a second flow channel 102. The first flow channel 101 is formed between the inner sleeve 13 and the outer sleeve 12. The upper end of the inner sleeve 13 horizontally penetrates out of the outer side of the outer sleeve 12 on the side close to the second inlet 19 to communicate with the low-temperature cavity 16. The lower end of the inner sleeve 13 is open to connect the first flow channel 101 and the second flow channel 102.

[0037] The partition plate 14 divides the cavity 111 of the body 11 into two cavities, i.e. the high-temperature cavity 15 (upper) and the low-temperature cavity 16 (lower). After the high-temperature steam comes out of the steam outlet 104 of the outer sleeve 12, it enters the high-temperature cavity 15 and then flows out through the outlet 17. After the high-temperature steam loses heat in the heat exchanger, it flows into the low-temperature cavity 16 through the low-temperature steam inlet. At the same time, the low-temperature cavity 16 also stores a certain amount of cooling water. The partition plate 14 is used to isolate the high-temperature steam and the low-temperature steam to prevent the low-temperature steam from flowing out directly from the outlet 17 after entering the cavity. The partition plate 14 is provided with a high-low temperature steam exchange port 141 for slow exchange of the high-temperature steam and the low-temperature steam, so as to maintain the consistent pressure difference between the upper and lower parts, thereby ensuring the internal self-circulation of the cooling water (the water in the first flow channel 101 is heated to form steam, which floats upward to drive the water in the second flow channel 102 to flow automatically inward).

[0038] As shown in FIG. 3, the present application further provides a graphitization furnace waste heat recovery device, which comprises a support frame 2, a graphitization furnace 3 and the above-mentioned waste heat recovery device 1. The support frame 2 is installed on the graphitization furnace 3, and each support frame 2 is installed with at least one waste heat recovery device 1.

[0039] As shown in FIG. 4 and FIG. 5, the support frame 2 comprises a portal frame 21, an installation frame 22, a driving mechanism 23 and a guide mechanism 24.

[0040] The gantry 21 comprises two spaced-apart vertical frames 211 and a horizontal frame 212 connected between the top portions of the two vertical frames 211. The vertical frames 211 are mounted on the graphitization furnace 3.

[0041] The driving mechanism 23 comprises a transmission shaft 231, a motor 232, upper chain wheels 233, a chain 234 and lower chain wheels 235. The upper chain wheels 233 are mounted on the two ends of the horizontal frame 212, and the lower chain wheels 235 are rotatably connected to the bottom portions of the vertical frames 211. The chain 234 connects the upper chain wheels 233 and the lower chain wheels 235. The mounting frame 22 is connected to the chain 234 and moves up and down with the chain 234. The transmission shaft 231 connects the two upper chain wheels 233, and the motor 232 (including a speed reducer) is connected to the transmission shaft 231.

[0042] The waste heat recovery device 1 is mounted on the mounting frame 22, and the outer sleeve 12 extends downward outside the mounting frame 22.

[0043] The mounting frame 22 is provided with a guide mechanism 24 on both sides. The guide mechanism 24 comprises 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 hingedly connected to the upper and lower ends of the rotating plate 242. The guide wheels 243 are in sliding contact with the outer side surfaces of the vertical frames 211. The center line of the hinge shaft 241 is located in the middle of the connecting line of the two guide wheels 243, and the two guide wheels 243 always maintain contact with the outer side surfaces of the vertical frames 211 through the hinge shaft 241, which is suitable for better adaptation and smoother sliding.

[0044] As shown in FIGS. 3 and 6, the graphitization furnace 3 is provided with a groove 31, and the groove 31 is provided with product material 32 and heat preservation material 33 wrapped around the outer periphery of the product material 32. As shown in FIG. 7, when the outer sleeve 12 is inserted into the product material 32, it simultaneously contacts the heat preservation material 33 and the product material 32, and can simultaneously obtain heat from the two materials to achieve simultaneous heat dissipation.

[0045] As shown in FIG. 8, the present application further provides a graphitization furnace waste heat recovery system, which comprises 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 device 1 are respectively communicated with the heat exchanger 4. The heat exchanger 4 is also respectively communicated with 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 communicated with the steam generator 7, and the steam generator 7 is communicated with the steam turbine 8 or the heat source 9. The heat source 9 is a device that needs heat, such as a drying device, a granulating device, a pre-carbonization device, etc.

[0046] The application further provides a method for recovering waste heat of a graphitization furnace, which is performed by using the above-mentioned waste heat recovery system of the graphitization furnace and comprises the following steps.

[0047] The cold water is injected into the low-temperature cavity 16 from the second inlet 19, enters the second flow channel 102 of the inner sleeve 13 from the water inlet 103, and then flows into the first flow channel 101 from the opening at the lower end of the inner sleeve 13. The driving mechanism 23 is started to drive the mounting frame 22 and the waste heat recovery device 1 on the mounting frame 22 to move downward, so that the outer sleeve 12 is inserted into the graphitization furnace 3 to contact the product material 32 of the heat preservation material 33 (as shown in FIG. 7) to obtain high temperature. The high temperature heats the cold water in the first flow channel 101 to generate high-temperature steam, which is discharged from the steam outlet 104 into the high-temperature cavity 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, and the low-temperature steam after the heat exchange enters the low-temperature cavity 16 from the first inlet 18. At the same time of the heat exchange, the molten salt in the low-temperature molten salt storage tank 6 enters the heat exchanger and is heated by the heat exchanger 4, and then enters the high-temperature molten salt storage tank 5. The low-temperature steam after the heat exchange enters the low-temperature cavity 16 from the first inlet 18 to generate high-temperature molten salt. The high-temperature molten salt flows back to the low-temperature molten salt storage tank 6 after entering the steam generator 7 from the high-temperature molten salt storage tank 5. In this process, the steam in the steam generator 7 is used in the steam turbine 8 or the heat source 9, respectively. The low-temperature steam formed by the steam turbine 8 or the heat source 9 returns to the steam generator 7. Thus, a full-flow heat extraction cycle is formed.

[0048] After the product material 32 and the heat preservation material 33 are completely cooled, the driving mechanism 23 is started again to move the mounting frame 22 and the waste heat recovery device 1 on the mounting frame 22 upward until the outer sleeve 12 is withdrawn to the upper side of the graphitization furnace 3 (as shown in FIG. 6), and the waste heat recovery of the graphitization furnace is completed.

[0049] The working environment of the above-mentioned recovery process is a low-temperature environment, and the recovery process can be continuously completed, which greatly improves the cooling efficiency, makes the production operation continuous, avoids dust generation, and transfers the waste heat to the energy storage station as a heat source of other equipment, thereby greatly reducing the production cost.

[0050] The waste heat recovery device 1 is installed on the installation frame 22 and can move up and down with the installation frame 22. When the waste heat recovery device 1 moves downward, the outer sleeve 12 can insert into the product material 32 and the heat preservation material 33 to take heat, greatly accelerating the heat dissipation efficiency of the high-temperature product material 32 and the heat preservation material 33, and shortening the cooling period. The cooling water in the first flow channel 101 is heated to form high-temperature steam which is sent to the heat exchanger 4 through the outlet 17. After heat exchange, the low-temperature steam returns to the low-temperature cavity 16 from the first inlet 18. The molten salt in the low-temperature molten salt storage tank 6 is heated when passing through the heat exchanger 4 and then enters the high-temperature molten salt storage tank 5. The high-temperature molten salt returns 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 the generator, and the other part is used for other heat sources (such as material drying, granulation, pre-carbonization, and other equipment requiring heat). The cold steam 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, thereby recovering heat and reducing production cost by about 30%.

[0051] Since the waste heat recovery device 1 can cool the product material 32 and the heat preservation material 33 to room temperature at one time, the cooling time only needs 12 hours, thereby avoiding the risk of high-temperature operation of the material lifting crane and the grab bucket and solving the dust problem. Embodiment

[0052] The embodiment one is repeated, except that the heat taking pipe 10 in the waste heat recovery device 1 is not divided into an inner sleeve and an outer sleeve. For example, a partition plate can be used to divide the heat taking pipe 10 into a second flow channel 102 and a first flow channel 101 located outside the second flow channel 102. The first flow channel 101 and the second flow channel 102 are in communication. The body 11 is provided with an outlet 17 for discharging high-temperature steam which communicates with the high-temperature cavity 15. The body 11 is respectively provided with a first inlet 18 for injecting cold water into the low-temperature cavity 16 and a second inlet 19 for injecting low-temperature steam into the low-temperature cavity 16 which communicate with the low-temperature cavity 16. The heat taking pipe 10 is respectively provided with a water inlet 103 and a steam outlet 104. The water inlet 103 communicates the second flow channel 102 with the low-temperature cavity 16. The steam outlet 104 communicates the first flow channel 101 with the high-temperature cavity 15. The heat taking pipe 10 extends from the body 11 to form a heat taking end.

[0053] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation obtained by using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A waste heat recovery device, characterized by, The application relates to a waste heat recovery device, which comprises a heat extraction pipe and a body with a cavity, a partition plate is arranged in the body, the partition plate divides the cavity into a high-temperature cavity and a low-temperature cavity, the heat extraction pipe is arranged on the body, a second flow channel is arranged in the heat extraction pipe, and a first flow channel is arranged outside the second flow channel and connected with the second flow channel. An outlet for discharging high-temperature steam is arranged on the body and communicated with the high-temperature cavity, and a first inlet for injecting cold water into the low-temperature cavity and a second inlet for injecting low-temperature steam into the low-temperature cavity are respectively arranged on the body and communicated with the low-temperature cavity. A water inlet and a steam outlet are respectively arranged on the heat extraction pipe, the water inlet is communicated with the second flow channel and the low-temperature cavity, the steam outlet is communicated with the first flow channel and the high-temperature cavity, and the heat extraction pipe is extended from the body to form a heat extraction end.

2. The heat recovery unit according to claim 1, characterized in that The heat extraction pipe comprises an outer sleeve and an inner sleeve, the inner sleeve is arranged in the outer sleeve, the inner sleeve forms the second flow channel, and the first flow channel is formed between the inner sleeve and the outer sleeve. The upper end of the inner sleeve is arranged outside the outer sleeve to form the water inlet, and the lower end of the inner sleeve is open to connect the second flow channel with the first flow channel. The upper end of the outer sleeve penetrates through the partition plate to form the steam outlet, and the lower end of the outer sleeve forms the heat extraction end.

3. The heat recovery unit according to claim 1, characterized in that The heat extraction end is a tapered head.

4. The heat recovery device according to claim 1, wherein A plurality of exchange ports for realizing consistent pressure difference between upper and lower parts through exchange are arranged on the partition plate, and the exchange ports are communicated with the high-temperature cavity and the low-temperature cavity.

5. A waste heat recovery device for a graphitization furnace, comprising a graphitization furnace, characterized by The application further relates to a support frame and a waste heat recovery device as claimed in any one of claims 1 to 4 arranged on the support frame. The support frame is used for driving the waste heat recovery device to act, so that the heat extraction pipe of the waste heat recovery device is contacted with or separated from a graphitization furnace.

6. The waste heat recovery device for graphitization furnace according to claim 5, wherein The support frame comprises a portal frame, a mounting frame arranged in the portal frame, and a driving mechanism used for driving the mounting frame to move up and down along the portal frame. The waste heat recovery device is arranged on the mounting frame, the heat extraction pipe is extended outside the mounting frame, and the portal frame is arranged on the graphitization furnace.

7. The waste heat recovery device for graphitization furnace according to claim 6, characterized by The portal frame comprises two vertical frames arranged at intervals and a horizontal frame connected between the top parts of the two vertical frames. The driving mechanism comprises a transmission shaft, a motor, an upper chain wheel, a chain and a lower chain wheel, the upper chain wheel is arranged at the two ends of the horizontal frame, the lower chain wheel is rotatably connected to the bottom part of the vertical frame, the upper chain wheel and the lower chain wheel are connected through the chain, the mounting frame is connected to the chain, the transmission shaft is connected to the two upper chain wheels, and the motor is connected to the transmission shaft. The vertical frame is arranged on the graphitization furnace, guide mechanisms are arranged on the two sides of the mounting frame, the guide mechanisms comprise a hinge shaft rotatably connected to the mounting frame, a rotating plate fixed to the hinge shaft, and guide wheels hingedly connected to the upper and lower ends of the rotating plate, and the guide wheels slide with the outer side of the vertical frame.

8. The waste heat recovery device for graphitization furnace according to claim 5, wherein A groove is arranged in the graphitization furnace, product materials and heat preservation materials wrapped around the periphery of the product materials are arranged in the groove, and the heat extraction pipe is inserted into the product materials and contacted with the heat preservation materials and the product materials.

9. A graphitization furnace waste heat recovery system characterized by, The heat exchanger, the high-temperature molten salt storage tank, the low-temperature molten salt storage tank, the steam generator, the graphite furnace waste heat recovery device according to any one of claims 5-8, the steam turbine and / or the heat source; The outlet and the first inlet of the waste heat recovery device are respectively communicated with the heat exchanger, the heat exchanger is also respectively communicated with 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 communicated with the steam generator, and the steam generator is communicated with the steam turbine or the heat source.

10. A method of recovering waste heat from a graphitization furnace, which is performed using the waste heat recovery system for a graphitization furnace according to claim 9, characterized by, The heat exchanger, the high-temperature molten salt storage tank, the low-temperature molten salt storage tank, the steam generator, the graphite furnace waste heat recovery device according to any one of claims 5-8, the steam turbine and / or the heat source; The cold water is injected into the low-temperature cavity from the second inlet, and the cold water flows into the first flow channel from the second flow channel and the water inlet; The waste heat recovery device installed on the support frame is driven to move, so that the heat extraction pipe contacts the heat preservation material and the product material in the graphite furnace to obtain high temperature; The high temperature heats the cold water in the second flow channel to generate high-temperature steam, and the high-temperature steam enters the high-temperature cavity and then flows out from the outlet into the heat exchanger; The heat exchanger exchanges heat with the high-temperature steam, and the low-temperature steam after the heat exchange enters the low-temperature cavity from the first inlet; At the same time of the heat exchange, the molten salt in the low-temperature molten salt storage tank enters the heat exchanger and is heated by the heat exchanger, and then enters the high-temperature molten salt storage tank to generate high-temperature molten salt; The high-temperature molten salt enters the steam generator from the high-temperature molten salt storage tank and then flows back to the low-temperature molten salt storage tank, and in this process, the steam in the steam generator is used for the steam turbine or the heat source; The low-temperature steam formed by the steam turbine or the heat source returns to the steam generator.

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