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

Abstract

The utility model provides a waste heat recovery device, a graphitization furnace waste heat recovery device and a graphitization furnace waste heat recovery system. The waste heat recoverer comprises an outer sleeve, an inner sleeve and a body with a containing cavity, a partition plate is arranged in the body and divides the containing cavity into an upper cavity and a lower cavity, an outlet communicated with the upper cavity is formed in the body, and a first inlet and a second inlet which are communicated with the lower cavity are formed in the body. One end of the outer sleeve penetrates through the body and the partition plate to be communicated with the upper cavity, the other end of the outer sleeve extends out of the outer side of the body, the inner sleeve is arranged in the outer sleeve in a sleeved mode, a flow channel is formed between the inner sleeve and the outer sleeve, one end of the inner sleeve penetrates out of the outer side of the outer sleeve to be communicated with the lower cavity, and the other end of the inner sleeve is communicated with the lower cavity. And the other end of the inner sleeve is communicated with the runner in the outer sleeve. According to the graphitization furnace, the heat dissipation efficiency is greatly improved, the cooling period is shortened, heat in the graphitization furnace is collected in the form of high-temperature steam, and the heat is recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery negative electrode material production, in particular to a waste heat recovery device, a graphitization furnace waste heat recovery device and a system. Background Art

[0002] As an electric vehicle and battery energy storage system, batteries generally include positive electrode materials, negative electrode materials, diaphragms, electrolytes, etc. With the rapid development of electric vehicles and battery energy storage, the current market demand for negative electrode materials is estimated to be 1.5 million tons per year, and the market demand is increasing. In the production of graphitization, the cooling time and workload account for more than 90% of the entire graphitization production cycle. Therefore, optimizing the cooling efficiency can significantly shorten the production cycle and reduce the workload.

[0003] In addition, the energy consumption cost of graphitization accounts for more than 95% of the graphitization process. Depending on the size and structure of the furnace, the power consumption of a single ton of product material reaches 4000-8000kwh. At present, the cooling of the graphitization furnace for the production of negative electrode materials for lithium batteries mainly adopts accelerated thinning or removal of the top insulation material to enhance the top heat dissipation. This method is to first use a grab to grab the insulation material on the top of the graphitization furnace, so that the top insulation material is separated from the product material, and then use the suction crane to absorb the insulation material, and use air cooling to dissipate the heat of the product material. On the one hand, the top heat dissipation method cannot directly cool the product material, nor can it cool the insulation materials on the sides and bottom, resulting in extremely low cooling efficiency. Generally, the cooling cycle takes about 30 days. In particular, the larger the furnace size, the longer the cooling cycle, and some cooling cycles even exceed 40 days. On the other hand, due to the early The temperature of the insulation material reaches 1000-2000℃, which makes it impossible for the suction crane to suck it. It can only be grabbed with a grab bucket. When grabbing, the insulation material forms a hot air flow under high temperature and will spray upward, causing a large amount of dust in the workshop, affecting the working environment and causing personnel safety accidents; thirdly, the suction crane needs to suck the insulation material on the top of the product material layer by layer, generally sucking 50-100mm each time (one layer is sucked when it is cold), and the entire insulation layer needs to be sucked 10-20 times, and the suction lasts for 7-10 days, which is labor-intensive and has high operating risks; fourthly, the heat of the insulation material and the product material is all dissipated in the air, causing great waste. Utility Model Content

[0004] The purpose of the utility model is to provide a waste heat recovery device, a graphitization furnace waste heat recovery device and a system to overcome the problems of long graphitization production cycle, low production efficiency, high production cost, great environmental pollution, high operation intensity and high operation risk.

[0005] The technical solution of the utility model is: a waste heat recovery device, comprising an outer sleeve, an inner sleeve and a body with a cavity, a partition is provided in the body, the partition divides the cavity into an upper cavity and a lower cavity, the body is provided with an outlet connected to the upper cavity, the body is provided with a first inlet and a second inlet respectively connected to the lower cavity, one end of the outer sleeve passes through the body and the partition to communicate with the upper cavity, the other end of the outer sleeve extends out of the outside of the body, the inner sleeve is sleeved in the outer sleeve, a flow channel is formed between the inner sleeve and the outer sleeve, and one end of the inner sleeve passes through the outside of the outer sleeve to communicate with the lower cavity, and the other end of the inner sleeve is connected with the flow channel in the outer sleeve.

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

[0007] Preferably, a plurality of exchange ports are arranged on the partition, and the exchange ports connect the upper cavity and the lower cavity.

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

[0009] The utility model also provides a waste heat recovery device for a graphitization furnace, comprising a graphitization furnace, a support frame and the above-mentioned waste heat recovery device installed on the support frame, wherein the support frame is installed above the graphitization furnace, and the waste heat recovery device is moved up and down toward the graphitization furnace through the support frame so that the outer sleeve can be inserted into the graphitization furnace or detached from the graphitization furnace.

[0010] Preferably, the support frame includes a gantry, a mounting frame arranged in the gantry, and a driving mechanism for driving the mounting frame to move up and down along the gantry, the waste heat recovery device is installed on the mounting frame, the outer sleeve extends downward from the outside of the mounting frame, and the gantry is installed on the graphitization furnace.

[0011] Preferably, the gantry comprises two vertical frames arranged at intervals and a horizontal frame connected between the tops of the two vertical frames; the driving mechanism comprises a transmission shaft, a motor, an upper sprocket, a chain and a lower sprocket, the upper sprocket is installed at both ends of the horizontal frame, the bottom of the vertical frame is rotatably connected to the lower sprocket, the upper sprocket and the lower sprocket are connected by a chain, the mounting frame is connected to the chain, the transmission shaft is connected to the two upper sprockets, and the motor is connected to the transmission shaft; the vertical frame is installed on the graphitization furnace;

[0012] A guide mechanism is provided on both sides of the installation frame, and the guide mechanism includes a hinge shaft rotatably connected to the installation frame, a rotating plate fixed on the hinge shaft, and guide wheels hinged 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.

[0013] Preferably, a groove is provided in the graphitization furnace, and a product material and a heat-insulating material covering the periphery of the product material are provided in the groove, and the outer sleeve is inserted into the product material and contacts with the heat-insulating material and the product material at the same time.

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

[0015] Compared with the related art, the beneficial effects of the utility model are:

[0016] 1. 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 can be inserted into the high-temperature product material to take heat, and then generate high-temperature steam to send to the steam turbine or heat source to realize waste heat recovery and reuse. On the one hand, it greatly speeds up the heat dissipation efficiency, shortens the cooling cycle, and reduces the entire production cycle 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, which can be used for power generation and as other heat sources, recovering heat and reducing production costs by about 30%;

[0017] Second, the outer sleeve 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, and then the suction crane is used to absorb the insulation material and the product material. Due to the low temperature, continuous operation can be carried out, which can generally be completed within 12 hours, thus avoiding the risk of high-temperature operation and dust problems, and reducing labor intensity;

[0018] 3. The waste heat recovery reaches 45%-60% of the power delivery, and the production cost is reduced by about 30%; it reduces environmental pollution and basically eliminates dust pollution in graphitization production; it greatly reduces the intensity of work and reduces the risk of work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional and partially cutaway structural schematic diagram of a waste heat recovery device provided by the utility model;

[0020] Figure 2 A cross-sectional schematic diagram of a waste heat recovery device provided by the utility model;

[0021] Figure 3 A schematic diagram of the structure of a waste heat recovery device for a graphitization furnace provided by the utility model;

[0022] Figure 4 for Figure 3 A schematic diagram of the installation of a support frame and a waste heat recovery device;

[0023] Figure 5 is a structural schematic diagram of the support frame;

[0024] Figure 6 This is a schematic diagram of the waste heat recovery device before heat extraction;

[0025] Figure 7 Schematic diagram of heat extraction from waste heat recovery device;

[0026] Figure 8 This is a structural schematic diagram of the graphitization furnace waste heat recovery system provided by the utility model.

[0027] In the attached drawings: 1. waste heat recovery device; 11. body; 111. chamber; 12. outer sleeve; 121. cone head; 13. inner sleeve; 14. partition; 141. exchange port; 15. upper chamber; 16. lower chamber; 17. outlet; 18. first inlet; 19. second inlet; 101. flow channel; 2. support frame; 21. gantry; 211. vertical frame; 212. horizontal frame; 22. installation frame; 23. drive Mechanism; 231, transmission shaft; 232, motor; 233, upper sprocket; 234, chain; 235, lower sprocket; 24, guide mechanism; 241, hinge shaft; 242, turn 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 DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0029] like Figure 1 , Figure 2 As shown, a 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 chamber 15, a lower chamber 16, an outlet 17, a first inlet 18, a second inlet 19 and a flow channel 101.

[0030] The body 11 is a closed olive-shaped body, and a cavity 111 is provided inside the body 11. The partition 14 is horizontally arranged inside the body 11, and the partition 14 divides 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, and the exchange ports 141 connect the upper cavity 15 and the lower cavity 16.

[0031] The body 11 is provided with an outlet 17 communicating with the upper chamber 15. The body 11 is provided with a first inlet 18 and a second inlet 19 communicating with the lower chamber 16 respectively. The outlet 17 and the first inlet 18 are located at the top of the body 11, and the first inlet 18 passes through the partition 14 and communicates with the lower chamber 16. The second inlet 19 is placed at one end of the body 11.

[0032] 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 passes through the body 11 and the partition 14 to communicate with the upper cavity 15. The lower end of the outer sleeve 12 extends out of the outside of the body 11, and a cone head 121 is provided at the lower end of the outer sleeve 12. The inner sleeve 13 is sleeved in 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 horizontally passes through the outer side of the outer sleeve 12 on the side close to the second inlet 19 and communicates with the lower cavity 16, and the lower end of the inner sleeve 13 communicates with the flow channel 101 in the outer sleeve 12.

[0033] The high and low temperature steam partition divides the waste heat recovery chamber into two chambers, the upper and lower chambers. After the high temperature steam comes out of the outer sleeve 12, it enters the upper chamber and then flows out through the outlet. After the high temperature steam passes through the heat exchanger and takes away the heat, it flows into the lower chamber through the low temperature steam inlet. At the same time, the lower chamber also stores a certain amount of cooling water. The high and low temperature steam partition is used to isolate the high temperature steam and the low temperature steam to prevent the low temperature steam from flowing directly out of the high temperature steam outlet after entering the chamber. The high and low temperature steam partition is provided with a high and low temperature steam exchange port, which is used for the slow exchange of high temperature steam and low temperature steam to maintain the same pressure difference between the upper and lower parts, thereby ensuring the internal self-circulation of the cooling water (the water between the inner and outer sleeves is heated to form steam floating, thereby driving the water in the inner sleeve to automatically flow inward).

[0034] like Figure 3 As shown, the utility model also provides a graphitization furnace waste heat recovery device, including a support frame 2, a graphitization furnace 3 and the above-mentioned waste heat recovery device 1. A plurality of the support frames 2 are installed on the graphitization furnace 3, and at least one waste heat recovery device 1 is installed on each of the support frames 2.

[0035] like Figure 4 , Figure 5 As shown, the support frame 2 includes a gantry 21 , a mounting frame 22 , a driving mechanism 23 and a guiding mechanism 24 .

[0036] The gantry 21 includes two vertical frames 211 spaced apart and a horizontal frame 212 connected between the tops of the two vertical frames 211. The vertical frames 211 are installed on the graphitization furnace 3.

[0037] The driving mechanism 23 includes a transmission shaft 231, a motor 232, an upper sprocket 233, a chain 234 and a lower sprocket 235. The upper sprocket 233 is installed at both ends of the horizontal frame 212, and the bottom of the vertical frame 211 is rotatably connected to the lower sprocket 235. The upper sprocket 233 and the lower sprocket 235 are connected by a chain 234. The mounting frame 22 is connected to the chain 234 and moves up and down with the chain 234. The transmission shaft 231 is connected to the two upper sprockets 233, and the motor 232 (including the reducer) is connected to the transmission shaft 231.

[0038] The waste heat recovery device 1 is installed on the installation frame 22 , and the outer sleeve 12 extends downwardly out of the outside of the installation frame 22 .

[0039] A guide mechanism 24 is provided on both sides of the installation frame 22. The guide mechanism 24 includes a hinge shaft 241 rotatably connected to the installation frame 22, a rotating plate 242 fixed on the hinge shaft 241, and guide wheels 243 hinged to the upper and lower ends of the rotating plate 242. The guide wheels 243 are in sliding contact with the outer side surface of the vertical 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 always keep in contact with the outer side surface of the vertical frame 211 through the hinge shaft 241, so that the adaptability is better and the sliding is more stable.

[0040] like Figure 3 , Figure 6 As shown, the graphitization furnace 3 is provided with a groove 31, and the groove 31 is provided with a product material 32 and a heat-insulating material 33 covering the periphery of the product material 32. Figure 7 As shown, when the outer sleeve 12 is inserted into the product material 32, it contacts the heat-insulating material 33 and the product material 32 at the same time, and can obtain heat from the two materials at the same time to achieve simultaneous heat dissipation.

[0041] like Figure 8As shown, the utility model 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 device 1 are respectively connected to the heat exchanger 4. The heat exchanger 4 is also connected to the high-temperature molten salt storage tank 5 and the low-temperature molten salt storage tank 6 respectively. 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 the steam turbine 8 or the heat source 9. The heat source 9 is a device that requires heat, such as for drying, granulation, pre-carbonization, etc.

[0042] The method for recovering waste heat from a graphitization furnace using the above-mentioned waste heat recovery system for a graphitization furnace comprises the following steps:

[0043] Cold water is injected into the lower chamber 16 from the second inlet 19, and the cold water enters the inner sleeve 13 and flows into the flow channel 101. The drive mechanism 23 is started to drive the mounting frame 22 and the waste heat recovery device 1 thereon to move downward, so that the outer sleeve 12 is inserted into the graphitization furnace 3 and contacts the insulation material 33 and the product material 32 (such as Figure 7 As shown), to obtain high temperature. The high temperature heats the cold water in the flow channel 101 to generate high-temperature steam, which enters the upper chamber 15 and then flows out from the outlet 17 into the heat exchanger 4. The heat exchanger 4 performs heat exchange on the high-temperature steam. During the exchange, 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. In this process, the steam in the steam generator 7 is used for 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. This forms a full-process cycle for heat extraction.

[0044] 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 thereon upward until the outer sleeve 12 is withdrawn to the top of the graphitization furnace 3 (such as Figure 6 As shown), the waste heat recovery of the graphitization furnace is completed.

[0045] The working environment of the above-mentioned recycling process is a low-temperature environment and can be completed continuously, which greatly improves the cooling efficiency, makes the production operation continuous, and avoids the occurrence of dust. The waste heat is transferred to the energy storage station through high-temperature steam as a heat source for other equipment, which greatly reduces the production cost.

[0046] The waste heat recovery device 1 of the utility model is installed on the mounting frame 22, and can move up and down with the mounting frame 22. When the waste heat recovery device 1 moves downward, the outer sleeve 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 channel 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 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 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 steam turbines and generators, and the other part is used for other heat sources (such as equipment that requires heat, such as material drying, granulation, and pre-carbonization). 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, thus recovering the heat and reducing production costs by about 30%.

[0047] Since the waste heat recovery device 1 can cool the product material 32 and the insulation material 33 to room temperature at one time, the cooling time only takes 12 hours, thereby avoiding the risk of high-temperature operation of the suction crane and grab bucket and solving the dust problem.

[0048] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A waste heat recovery device, characterized in that: It includes an outer sleeve, an inner sleeve and a body with a cavity, wherein a partition is provided in the body, and the partition divides the cavity into an upper cavity and a lower cavity, the body is provided with an outlet connected to the upper cavity, and the body is provided with a first inlet and a second inlet respectively connected to the lower cavity, one end of the outer sleeve passes through the body and the partition to communicate with the upper cavity, and the other end of the outer sleeve extends out of the outside of the body, the inner sleeve is sleeved in the outer sleeve, a flow channel is formed between the inner sleeve and the outer sleeve, and one end of the inner sleeve passes through the outside of the outer sleeve to communicate with the lower cavity, and the other end of the inner sleeve is connected with the flow channel in the outer sleeve.

2. The waste heat recovery device according to claim 1, characterized in that: The end of the outer sleeve extending out of the body is a cone head.

3. The waste heat recovery device according to claim 1, characterized in that: A plurality of exchange ports are arranged on the partition, and the exchange ports connect the upper chamber and the lower chamber.

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

5. A graphitization furnace waste heat recovery device, comprising a graphitization furnace, characterized in that: It also includes a support frame and a waste heat recovery device as described in any one of claims 1 to 4 installed on the support frame, the support frame is installed above the graphitization furnace, and the waste heat recovery device is moved up and down toward the graphitization furnace through the support frame so that the outer sleeve can be inserted into the graphitization furnace or detached from the graphitization furnace.

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

7. The graphitization furnace waste heat recovery device according to claim 6, characterized in that: The gantry comprises two vertical frames arranged at intervals and a horizontal frame connected between the tops of the two vertical frames; the driving mechanism comprises a transmission shaft, a motor, an upper sprocket, a chain and a lower sprocket, the upper sprocket is installed at both ends of the horizontal frame, the bottom of the vertical frame is rotatably connected to the lower sprocket, the upper sprocket and the lower sprocket are connected by a chain, the mounting frame is connected to the chain, the transmission shaft is connected to the two upper sprockets, and the motor is connected to the transmission shaft; the vertical frame is installed on the graphitization furnace; A guide mechanism is provided on both sides of the installation frame, and the guide mechanism includes a hinge shaft rotatably connected to the installation frame, a rotating plate fixed on the hinge shaft, and guide wheels hinged 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.

8. The graphitization furnace waste heat recovery device according to claim 5, characterized in that: A groove is provided in the graphitization furnace, and a product material and a heat-insulating material covering the periphery of the product material are provided in the groove. The outer sleeve is inserted into the product material and contacts with the heat-insulating material and the product material at the same time.

9. A graphitization furnace waste heat recovery system, characterized in that: It 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 to 8, a steam turbine and / or a heat source, wherein the outlet and the first inlet of the waste heat recovery device in the graphitization furnace waste heat recovery device are respectively connected to the heat exchanger, and 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, and the steam generator is connected to the steam turbine or the heat source.

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