Waste heat recovery system for graphite production

Abstract

The utility model discloses a waste heat recovery system for graphite production, which comprises a roasting furnace and a green body preheating furnace, a heat preservation jacket is fixedly arranged in the roasting furnace, a first spiral pipe is coiled in the heat preservation jacket, the input end of the first spiral pipe is communicated with a cold flow guide pipe, and the input end of the cold flow guide pipe is communicated with a hot water pipe. The other end of the cold flow guide pipe is communicated with a first circulating pump, the output end of the first circulating pump is communicated with an inlet pipe, the output end of the first spiral pipe is communicated with a hot flow guide pipe, and a second spiral pipe is wound on the inner wall of the green body preheating furnace. Through the sleeve design of the circulating outer pipe and the circulating inner pipe, the positions of the interiors of the circulating outer pipe and the circulating inner pipe are kept stable through the reinforcing strips, heat radiation can be transmitted perfectly through the sleeve design, the heat conduction effect is improved, and heat loss is reduced, so that the heat conduction effect is stable, the temperature of discharged medium liquid is increased, and the service life of the heat exchanger is prolonged. The heat loss is reduced, the overall utilization effect is good, and the heat utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of waste heat recovery for graphite production, in particular to a waste heat recovery system for graphite production. BACKGROUND

[0002] Graphite production is divided into natural graphite production and artificial graphite production. Natural graphite production requires mining, and there are two ways of underground and open-pit mining. After mining, methods such as flotation, gravity separation, and magnetic separation can be used for ore dressing. Chemical purification is also required for high-purity requirements. Artificial graphite production first prepares raw materials, including selecting petroleum coke and other raw materials and pretreatment. Then, through molding, such as extrusion, mold pressing, and static pressure molding methods, the green body is successively carbonized and graphitized after baking to convert amorphous carbon into graphite crystal structure, thereby obtaining artificial graphite products.

[0003] In the process of graphite production, graphite needs to be baked and graphitized at high temperature to be shaped. A large amount of heat is needed for the operation, so a lot of heat is wasted and cannot be utilized. The existing waste heat recovery device has low recovery efficiency and cannot be used for multiple recovery and utilization, thereby reducing the efficiency of heat recovery. Therefore, a waste heat recovery system for graphite production is proposed. SUMMARY

[0004] The utility model aims at providing a waste heat recovery system for graphite production to solve the problems in the background technology.

[0005] In order to achieve the above object, the utility model provides the following technical scheme: A waste heat recovery system for graphite production, including calcination furnace and blank preheating furnace, the inside fixed mounting of calcination furnace has heat preservation jacket, the inside of heat preservation jacket has first spiral pipe, the input end of first spiral pipe is connected with cold flow guide pipe, the other end of cold flow guide pipe is connected with circulating pump machine no.

[0006] Preferably, the circulating pump machine one is fixedly installed on the top of the blank preheating furnace, the cold flow guide pipe is fixedly penetrated through the calcination furnace and extends to the outside of the calcination furnace, one end of the hot flow guide pipe is fixedly penetrated through the calcination furnace and extends to the inside of the blank preheating furnace, the other end of the hot flow guide pipe away from the calcination furnace is communicated with the input end of the second spiral pipe, the other end of the entering pipe away from the circulating pump machine one is communicated with the output end of the second spiral pipe, the inside of the first spiral pipe and the second spiral pipe is provided with water glycol mixture.

[0007] Preferably, the inside of the heat preservation jacket has first spiral pipe, the input end of first spiral pipe is connected with cold flow guide pipe, the other end of cold flow guide pipe is connected with circulating pump machine no.

[0008] Preferably, the waste gas exhaust pipe is fixedly installed on one end of the calcination furnace through the flange ring, the connecting pipe and the communication pipe are connected through the flange.

[0009] Preferably, the circulating outer tube and the circulating inner tube are fixedly distributed in the inside of the waste gas exhaust pipe in the form of thread spiral sleeve joint, the circulating outer tube and the circulating inner tube are fixedly penetrated through the waste gas exhaust pipe and extend to the outside of the waste gas exhaust pipe.

[0010] Preferably, the wrapped spherical shell is fixed on the outside of the circulating inner tube, the circulating inner tube is fixed through the wrapped spherical shell and extends to the outside of the wrapped spherical shell, and the outside of the heat exhaust pipe is provided with a flange ring.

[0011] Compared with the prior art, the beneficial effects of the utility model are that: when the circulating system is used, the operating personnel puts the graphite blank that needs to be sintered into the inside of the roasting furnace and the blank preheating furnace, heat is generated when sintering is carried out in the inside of the roasting furnace, the heat is conducted to the inside of the heat preservation jacket, the heat conduction liquid in the inside of the second spiral pipe and the inlet pipe is pumped into the inside of the first spiral pipe through the cold flow guide pipe along with the operation of the circulating pump machine one, the heat in the inside of the heat preservation jacket is absorbed and taken away through the first spiral pipe, the heat is circulated to the inside of the second spiral pipe through the heat flow guide pipe, and the second spiral pipe and the hollow inner cylinder release heat to the inside of the blank preheating furnace, so that the graphite blank in the inside of the blank preheating furnace is preheated, thereby reducing the subsequent sintering time, and a lot of hot gas and waste gas is generated during the sintering process of the roasting furnace, the waste gas is guided into the inside of the installation shell through the waste gas exhaust pipe, at this time, the heat is absorbed and transferred to the inside of the hot end of the semiconductor thermocouple through the inner heat dissipation fins, and the outside of the cold end of the semiconductor thermocouple is cooled through the outer heat dissipation fins, so that the thermocouple effect is generated between the hot end of the semiconductor thermocouple and the cold end of the semiconductor thermocouple, thereby generating electric current, thereby utilizing the waste heat to generate electricity, and the utilization effect is increased, and the circulating pump machine two and the heat exhaust pipe are connected with the heat conduction liquid circulation utilization equipment, the heat conduction liquid is pumped into the inside of the circulating inner tube under the pumping of the circulating pump machine two, is guided to the inside of the plugging ball through the circulating inner tube, is guided into the inside of the circulating outer tube through the plugging ball due to the plugging of the inside of the plugging ball, flows through the opposite sides of the circulating outer tube and the circulating inner tube, and is heated due to the contact with the heat, so that the heat conduction liquid in the inside of the circulating outer tube and the circulating inner tube is heated, is pushed to the wrapped spherical shell through the water flow, is guided out through the heat exhaust pipe due to the plugging state of the wrapped spherical shell, and is circulated to the heat utilization device, thereby increasing the diversified heat circulation utilization operation and the waste heat utilization effect, and the overall utilization efficiency is high.

[0012] The utility model discloses a sleeve design of circulating outer tube and circulating inner tube, and the inside of circulating outer tube and circulating inner tube keeps stable position through reinforcing strip, and the design of sleeve can perfect the transmission of heat radiation, increases the heat conduction effect, and reduces heat loss, thereby stabilizing the heat conduction effect, increasing the temperature of the discharged medium liquid, reducing heat loss, and improving the heat utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front perspective view of the appearance structure of the utility model.

[0014] Figure 2The front view partial sectional view three-dimensional structure schematic diagram of the utility model.

[0015] Figure 3 The utility model is a top view sectional view internal structure schematic diagram.

[0016] Figure 4 The utility model Figure 2 The enlarged structure schematic diagram of A in the middle.

[0017] In the drawing: 1, the roasting furnace; 2, the body preheating furnace; 3, the hot guide pipe; 4, the cold guide pipe; 5, circulating pump machine one; 6, the inlet pipe; 7, the exhaust pipe; 8, the connecting pipe; 9, the communication pipe; 10, the installation shell; 11, the outer heat dissipation fin; 12, the circulating outer pipe; 13, the circulating inner pipe; 14, the hot exhaust pipe; 15, the wrapping spherical shell; 16, circulating pump machine two; 17, the heat preservation jacket; 18, the first spiral pipe; 19, the hollow inner cylinder; 20, the second spiral pipe; 21, the inner heat dissipation fin; 22, the semiconductor thermocouple hot end; 23, the semiconductor thermocouple cold end; 24, the plugging ball; 25, the reinforcing strip. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0019] Please refer to Figures 1-4The utility model provides a technical scheme: a waste heat recovery system for graphite production, including calcination furnace 1 and blank preheating furnace 2, the inside fixed mounting of calcination furnace 1 has heat -preserving jacket 17, and the inside spiral of heat -preserving jacket 17 has first spiral pipe 18, and the input end of first spiral pipe 18 is connected with cold flow guide pipe 4, and the other end of cold flow guide pipe 4 is connected with circulating pump machine no. 5, and the output end of circulating pump machine no. 5 is connected with into pipe 6, and the output end of first spiral pipe 18 is connected with hot flow guide pipe 3, and the inner wall spiral of blank preheating furnace 2 has second spiral pipe 20, and the inboard fixed mounting of second spiral pipe 20 has hollow inner tube 19, and one end of calcination furnace 1 is connected with waste gas exhaust pipe 7, and the top of waste gas exhaust pipe 7 is connected with installation shell 10, and the inboard fixed mounting of installation shell 10 has semiconductor thermocouple hot end 22, and the inboard fixed mounting of semiconductor thermocouple hot end 22 has a plurality of inner heat dissipation fins 21, and the outboard fixed mounting of semiconductor thermocouple hot end 22 has semiconductor thermocouple cold end 23, and the outboard fixed mounting of semiconductor thermocouple cold end 23 has a plurality of outer heat dissipation fins 11, and the top of installation shell 10 is connected with communicating pipe 9, and the top of communicating pipe 9 is connected with connecting pipe 8, and the inside spiral of waste gas exhaust pipe 7 has circulating outer tube 12, and the inside fixed sleeve of circulating outer tube 12 has two reinforcing strips 25, and the inboard fixed mounting of two reinforcing strips 25 has circulating inner tube 13, and the top end fixed mounting of circulating outer tube 12 has block ball 24, and the outboard fixed mounting of circulating outer tube 12 far from block ball 24 one end has package sphere shell 15, and the bottom of package sphere shell 15 is connected with hot exhaust pipe 14, and the one end far from package sphere shell 15 of circulating inner tube 13 is connected with circulating pump machine no. 16.

[0020] The working principle of the above technical scheme is as follows: in use, the graphite blank to be sintered is placed in the interior of the roasting furnace 1 and the blank preheating furnace 2, heat is generated in the interior of the roasting furnace 1 during sintering, the heat is conducted to the interior of the heat preservation jacket 17, the heat is conducted through the first spiral pipe 18 and the heat preservation jacket 17, and the heat conducting liquid in the interior of the second spiral pipe 20 and the inlet pipe 6 is pumped into the interior of the first spiral pipe 18 through the cold flow guide pipe 4 along with the operation of the circulating pump machine 1, the heat in the interior of the heat preservation jacket 17 is absorbed and taken away by the first spiral pipe 18, the heat is circulated to the interior of the second spiral pipe 20 through the hot flow guide pipe 3, and the heat is released to the interior of the blank preheating furnace 2 through the second spiral pipe 20 and the hollow inner cylinder 19, so that the graphite blank in the interior of the blank preheating furnace 2 is preheated, thereby reducing the subsequent sintering time, and a lot of hot gas and waste gas is generated during the sintering process of the roasting furnace 1, the waste gas is guided into the interior of the installation shell 10 through the waste gas discharge pipe 7, at this time, the heat is absorbed and transferred to the interior of the semiconductor thermocouple hot end 22 through the inner heat dissipation fins 21, and the outer side of the semiconductor thermocouple cold end 23 is cooled through the outer heat dissipation fins 11, so that the thermoelectric effect is generated between the semiconductor thermocouple hot end 22 and the semiconductor thermocouple cold end 23, thereby generating an electric current, thereby generating electricity through the thermoelectric effect using waste heat, increasing the utilization effect, increasing the waste heat utilization effect, and the overall utilization efficiency is high.

[0021] In another embodiment, as shown in Figures 1-4 The circulating pump machine 1 is fixedly installed on the top of the blank preheating furnace 2, the cold flow guide pipe 4 is fixedly penetrated through the roasting furnace 1 and extends to the outside of the roasting furnace 1, one end of the hot flow guide pipe 3 is fixedly penetrated through the roasting furnace 1 and extends to the interior of the blank preheating furnace 2, the end of the hot flow guide pipe 3 away from the roasting furnace 1 is connected in communication with the input end of the second spiral pipe 20, the end of the inlet pipe 6 away from the circulating pump machine 1 is connected in communication with the output end of the second spiral pipe 20, and the interiors of the first spiral pipe 18 and the second spiral pipe 20 are provided with water glycol mixed liquid.

[0022] The graphite blank to be sintered is placed in the interior of the roasting furnace 1 and the blank preheating furnace 2, heat is generated in the interior of the roasting furnace 1 during sintering, the heat is conducted to the interior of the heat preservation jacket 17, the heat is conducted through the first spiral pipe 18 and the heat preservation jacket 17, and the heat conducting liquid in the interior of the second spiral pipe 20 and the inlet pipe 6 is pumped into the interior of the first spiral pipe 18 through the cold flow guide pipe 4 along with the operation of the circulating pump machine 1, the heat in the interior of the heat preservation jacket 17 is absorbed and taken away by the first spiral pipe 18, the heat is circulated to the interior of the second spiral pipe 20 through the hot flow guide pipe 3, and the heat is released to the interior of the blank preheating furnace 2 through the second spiral pipe 20 and the hollow inner cylinder 19, so that the graphite blank in the interior of the blank preheating furnace 2 is preheated, thereby reducing the subsequent sintering time.

[0023] In another embodiment, as shown in Figures 1-4As shown, the inner heat dissipation fins 21 are uniformly distributed on the inner side of the semiconductor thermocouple hot end 22 and the mounting shell 10, and the outer heat dissipation fins 11 are uniformly distributed on the outer side of the semiconductor thermocouple cold end 23.

[0024] The inner heat dissipation fins 21 conduct heat for the semiconductor thermocouple hot end 22, and the outer heat dissipation fins 11 conduct heat for the semiconductor thermocouple cold end 23, both of which play a role in heat dissipation, facilitating the widening of the temperature difference and improving the power generation efficiency of the thermocouple.

[0025] In another embodiment, as shown in Figures 1-4 The exhaust gas discharge pipe 7 is fixedly installed at one end of the roasting furnace 1 through a flange ring, and the connecting pipe 8 and the communication pipe 9 are connected through flanges.

[0026] The exhaust gas discharge pipe 7 is connected through a flange ring, which is convenient for installation in different roasting furnaces 1 and also facilitates maintenance. The connecting pipe 8 guides hot gas out for subsequent purification treatment and heat utilization, and is convenient for disassembly and assembly according to actual needs, facilitating use.

[0027] In another embodiment, as shown in Figures 1-4 The circulating outer pipe 12 and the circulating inner pipe 13 are fixedly distributed inside the exhaust gas discharge pipe 7 in a threaded spiral sleeve joint, and the circulating outer pipe 12 and the circulating inner pipe 13 are fixedly penetrated through the exhaust gas discharge pipe 7 and extend to the outside of the exhaust gas discharge pipe 7.

[0028] The sleeve joint design of the circulating outer pipe 12 and the circulating inner pipe 13 keeps the inside of the circulating outer pipe 12 and the circulating inner pipe 13 stable through the reinforcing strip 25, and the sleeve joint design can perfectly transfer heat radiation, increase heat conduction effect, and reduce heat loss, thereby stabilizing the heat conduction effect, increasing the temperature of the discharged medium liquid, reducing heat loss, achieving good overall utilization effect, and improving heat utilization efficiency.

[0029] In another embodiment, as shown in Figures 1-4 The wrapped spherical shell 15 is fixedly sleeved on the outside of the circulating inner pipe 13, the circulating inner pipe 13 is fixedly penetrated through the wrapped spherical shell 15 and extends to the outside of the wrapped spherical shell 15, and the outer side of the heat discharge pipe 14 is provided with a flange ring.

[0030] The circulating pump machine 16 and the heat exhaust pipe 14 are connected with the heat conducting liquid circulation utilization device. The heat conducting liquid enters the inside of the circulating inner pipe 13 under the pumping of the circulating pump machine 16, is guided to the inside of the blocking ball 24 through the circulating inner pipe 13, and is guided to the inside of the circulating outer pipe 12 through the blocking ball 24 due to the blocking of the inside of the blocking ball 24. The heat conducting liquid flows through the circulating outer pipe 12 and the circulating inner pipe 13 on the opposite sides, is heated by the heat of the exhaust pipe 7, and is heated to the inside of the circulating outer pipe 12 and the circulating inner pipe 13. The heat conducting liquid is pushed to the wrapped ball shell 15, is finally guided out through the heat exhaust pipe 14, circulates to the heat utilization device, and increases the diversified heat circulation utilization operation.

[0031] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery system for graphite production, comprising a calcining furnace (1) and a preheating furnace for green bodies (2), characterized in that: The roasting furnace (1) is fixedly installed with a heat-insulating jacket (17). A first spiral tube (18) is coiled inside the heat-insulating jacket (17). The input end of the first spiral tube (18) is connected to a cold guide tube (4). The other end of the cold guide tube (4) is connected to a circulating pump (5). The output end of the circulating pump (5) is connected to an inlet pipe (6). The output end of the first spiral tube (18) is connected to a heat guide tube (3). The billet is preheated. A second spiral tube (20) is coiled on the inner wall of the furnace (2). A hollow inner cylinder (19) is fixedly installed on the inner side of the second spiral tube (20). One end of the roasting furnace (1) is connected to a waste gas discharge pipe (7). The top of the waste gas discharge pipe (7) is connected to a mounting shell (10). A semiconductor thermocouple hot end (22) is fixedly installed on the inner side of the mounting shell (10). Several internal heat dissipation fins (21) are fixedly installed on the inner side of the semiconductor thermocouple hot end (22). A semiconductor thermocouple cold junction (23) is fixedly installed on the outside of the hot junction (22) of the semiconductor thermocouple. Several external heat dissipation fins (11) are fixedly installed on the outside of the cold junction (23). A connecting pipe (9) is connected to the top of the mounting shell (10). A connecting pipe (8) is connected to the top of the connecting pipe (9). A circulating outer pipe (12) is coiled inside the exhaust pipe (7). Two reinforcing sleeves are fixedly fitted inside the circulating outer pipe (12). The inner side of the two reinforcing strips (25) is fixedly installed with a circulation inner tube (13), the top end of the circulation outer tube (12) is fixedly installed with a sealing ball (24), the outer side of the circulation outer tube (12) away from the sealing ball (24) is fixedly installed with a wrapping ball shell (15), the bottom of the wrapping ball shell (15) is connected to a heat discharge pipe (14), and the end of the circulation inner tube (13) away from the wrapping ball shell (15) is connected to a circulation pump (16).

2. The waste heat recovery system for graphite production according to claim 1, characterized in that: The circulating pump (5) is fixedly installed on the top of the billet preheating furnace (2). The cold guide pipe (4) is fixedly inserted through the roasting furnace (1) and extends to the outside of the roasting furnace (1). One end of the hot guide pipe (3) is fixedly inserted through the roasting furnace (1) and extends to the inside of the billet preheating furnace (2). The end of the hot guide pipe (3) away from the roasting furnace (1) is connected to the input end of the second spiral pipe (20). The end of the inlet pipe (6) away from the circulating pump (5) is connected to the output end of the second spiral pipe (20). The first spiral pipe (18) and the second spiral pipe (20) are filled with a water-ethylene glycol mixture.

3. The waste heat recovery system for graphite production according to claim 1, characterized in that: The inner heat dissipation fins (21) are evenly distributed in a circle on the inner side of the hot end (22) of the semiconductor thermocouple and the mounting shell (10), and the outer heat dissipation fins (11) are evenly distributed in a circle on the outer side of the cold end (23) of the semiconductor thermocouple.

4. The waste heat recovery system for graphite production according to claim 1, characterized in that: The exhaust pipe (7) is fixedly installed at one end of the roasting furnace (1) by a flange ring, and the connecting pipe (8) and the connecting pipe (9) are connected by a flange.

5. The waste heat recovery system for graphite production according to claim 1, characterized in that: The outer circulation pipe (12) and the inner circulation pipe (13) are fixedly distributed inside the exhaust gas discharge pipe (7) in a spiral coiled manner. The outer circulation pipe (12) and the inner circulation pipe (13) are fixedly inserted through the exhaust gas discharge pipe (7) and extend to the outside of the exhaust gas discharge pipe (7).

6. The waste heat recovery system for graphite production according to claim 1, characterized in that: The enclosing shell (15) is fixedly sleeved on the outside of the circulating inner tube (13), the circulating inner tube (13) is fixedly inserted through the enclosing shell (15) and extends to the outside of the enclosing shell (15), and a flange ring is provided on the outside of the heat discharge pipe (14).

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