High-temperature electrolyte tail gas pipeline heat preservation system utilizing waste heat

Abstract

The utility model discloses a high-temperature electrolyte tail gas pipeline thermal insulation system utilizing waste heat, which is characterized in that in the process of cooling materials by an evaporative cooling device of a high-temperature pyrolyzing furnace, cooling water absorbs a large amount of heat and then is vaporized into water vapor, and the water vapor is collected into a steam pocket of the evaporative cooling device; then water vapor in the steam pocket is conveyed into water in a heat preservation cover cylinder of an electrolyte tail gas pipeline of the low-temperature volatilization furnace, heat preservation is conducted on the electrolyte tail gas pipeline, the electrolyte in the electrolyte tail gas pipeline is kept in a high-temperature gas state all the time, and treatment such as follow-up tail gas purification and recovery is facilitated; meanwhile, liquid electrolyte adhesion material particles are prevented from being attached to the pipe wall to cause blockage of an electrolyte tail gas pipeline, the working reliability of the low-temperature volatilization furnace is improved, meanwhile, waste heat of the high-temperature pyrolysis furnace is recycled, and the purposes of saving energy and saving production cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat. Background Art

[0002] In the recycling of waste lithium batteries, the waste lithium batteries will first be broken into pieces of several centimeters in a crusher. For production safety reasons, the broken materials will first be sent to a low-temperature volatilization furnace to volatilize the electrolyte in the material that may cause explosion during the high-temperature pyrolysis process. The electrolyte volatilization temperature must be maintained above 120°C. If the temperature is not reached, the electrolyte may liquefy in the exhaust pipe, which is not conducive to the subsequent extraction, purification and recycling operations. The liquid electrolyte will also adhere to the material particles and adhere to the wall of the exhaust pipe, causing the exhaust pipe to be blocked. The material after low-temperature volatilization is vibrated. The dynamic screen and air separator separate the diaphragm, positive and negative electrodes, shell and column head. The positive and negative electrodes enter the high-temperature pyrolysis furnace. The pyrolysis temperature is above 500℃. Pyrolysis will separate the metal powder and organic matter. The separated materials need to be cooled by the cooling water device at the tail of the high-temperature pyrolysis furnace before being taken out of the furnace for sorting and other treatments. The cooling water will vaporize into water vapor after being heated. The temperature of water vapor is as high as 300℃, which contains huge heat. If this heat is discharged directly, it will cause a lot of energy waste. In addition, there is a risk of overflow of excessive water vapor during the cooling process. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a high-temperature electrolyte tail gas pipeline insulation system that utilizes waste heat.

[0004] A high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat is characterized by comprising: a high-temperature pyrolysis furnace, wherein the tail portion of the high-temperature pyrolysis furnace is provided with a vaporization cooling device including a steam drum for receiving water vapor, and a saturated steam pipe is provided at the top of the steam drum; a low-temperature volatilization furnace, wherein the head portion of the low-temperature volatilization furnace is provided with an electrolyte tail gas pipeline; and a heat preservation device, wherein the heat preservation device comprises a heat preservation cover tube with a closed inner cavity provided on the outer wall of the electrolyte tail gas pipeline, a steam delivery pipe connected to the outlet of the saturated steam pipe, a steam inlet is provided on the outer wall of the heat preservation cover tube, the steam inlet is sealed and connected to the outlet of the steam delivery pipe, and a discharge outlet connected to the discharge valve is provided on the wall of the heat preservation cover tube.

[0005] Preferably, a cooling water delivery downcomer and a steam riser connected to the cooling pipe of the tail part of the high-temperature pyrolysis furnace are provided at the bottom of the drum, and a water supply pipe is connected to the lower part of one side of the drum.

[0006] Preferably, a heat-conducting layer is provided between the heat-insulating cover tube and the outer wall of the electrolyte tail gas pipeline.

[0007] Preferably, the outer wall of the steam delivery pipe is wrapped with a first thermal insulation layer.

[0008] Preferably, the outer wall of the heat-insulating cover is provided with a plurality of steam inlets evenly spaced along the axial direction of the heat-insulating cover, and the steam delivery pipe extends with a plurality of steam delivery branches adapted to be sealed and connected with the steam inlets.

[0009] Preferably, the outlet of the discharge pipe is communicated with the inner cavity of the water supply pipe.

[0010] Preferably, a liquid level sensor and a temperature sensor connected to the inner cavity of the heat-insulating cover are connected to the outer wall of the heat-insulating cover.

[0011] Preferably, the outer wall of the heat-insulating cover is wrapped with a second heat-insulating layer.

[0012] Preferably, the steam delivery pipe is connected to a high-temperature resistant vacuum pump.

[0013] Preferably, a first one-way valve is installed near the steam inlet of the steam delivery pipe, and the flow direction of the first one-way valve is from the steam delivery pipe to the inner cavity of the heat preservation cover cylinder.

[0014] Preferably, a second one-way valve is installed near the steam inlet of the steam delivery branch pipe, and the flow direction of the second one-way valve is from the steam delivery branch pipe to the inner cavity of the heat preservation cover cylinder.

[0015] The beneficial effects of the utility model are:

[0016] The water vapor containing a large amount of heat energy in the vaporization cooling device of the high-temperature pyrolysis furnace is recovered and utilized through the insulation device, and the volatilized electrolyte in the electrolyte tail gas pipeline of the low-temperature volatilization furnace is insulated to prevent the electrolyte in the electrolyte tail gas pipeline from liquefying due to temperature drop, so that it is always kept in a gaseous state, which is beneficial for the subsequent tail gas purification device and the recovery device to treat the tail gas. It can also prevent the liquefied electrolyte from adhering to the pipe wall of the electrolyte tail gas pipeline to block the pipeline, thereby improving the working reliability of the low-temperature volatilization furnace. At the same time, the waste heat of the high-temperature pyrolysis furnace is recovered and reused, avoiding energy waste and achieving good results in energy saving and production cost saving. In addition, it can also prevent the water vapor in the vaporization cooling device from overflowing, and also improve the safety performance of the vaporization cooling device of the high-temperature pyrolysis furnace.

[0017] The outlet of the discharge pipe is connected to the inner cavity of the water supply pipe, and the liquid water that is continuously accumulated in the inner cavity of the insulation cover and cooled after insulation can be discharged into the steam drum of the vaporization cooling device of the high-temperature pyrolysis furnace, which is convenient for forming a cooling and insulation cycle between the vaporization cooling device of the high-temperature pyrolysis furnace 1 and the insulation device of the electrolyte tail gas pipeline of the low-temperature volatilization furnace. On the one hand, it can save water resources, and on the other hand, there is no need to set up an additional drainage device for the discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a structural schematic diagram of a high-temperature electrolyte tail gas pipeline insulation system that utilizes waste heat proposed by the utility model.

[0019] Figure 2 This is a cross-sectional view of the insulation device of the high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat proposed by the utility model at the electrolyte tail gas pipeline. DETAILED DESCRIPTION

[0020] The specific implementation of the high-temperature electrolyte tail gas pipeline insulation system using waste heat proposed by the present invention will be described below with reference to the accompanying drawings.

[0021] like Figure 1 As shown, a high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat comprises: a high-temperature pyrolysis furnace 1, a vaporization cooling device 2 provided at the tail portion of the high-temperature pyrolysis furnace 1, the vaporization cooling device 2 comprising a steam drum 21, a cooling water delivery downcomer 22 and a steam riser 23 connected to the cooling pipeline of the tail portion of the high-temperature pyrolysis furnace 1 provided at the bottom end of the steam drum 21, a water supply pipeline 24 connected to a lower position on one side of the steam drum 21, and a saturated steam pipe 25 connected to the inner cavity of the steam drum 21 provided at the top end of the steam drum 21.

[0022] The furnace head portion of the low-temperature volatilization furnace 3 is provided with an electrolyte exhaust gas pipeline 4. The heat preservation device 5 includes a heat preservation cover 51 with a closed inner cavity provided on the outer wall of the electrolyte exhaust gas pipeline 4, a steam delivery pipe 52 connected to the outlet of the saturated steam pipe 25, and a steam inlet 511 connected to the inner cavity of the heat preservation cover 51 is formed on the outer wall of the heat preservation cover 51. The steam inlet 511 is sealed and connected to the outlet of the steam delivery pipe 52. A discharge outlet 512 connected to the inner cavity of the heat preservation cover 51 is formed on the wall of the heat preservation cover 51. The discharge outlet 512 is sealed and connected to the discharge pipe 53. The discharge pipe 53 is connected to a discharge valve 531.

[0023] During the cooling process of the materials at the tail of the high-temperature pyrolysis furnace 1, the water supply pipe 24 will introduce cooling water into the steam drum 21, and the cooling water in the steam drum will then flow to the cooling water pipe in the furnace body at the tail of the furnace through the cooling water delivery downcomer 22. After absorbing the heat of the materials in the furnace body, the cooling water will vaporize into water vapor and rise to the inner cavity of the steam drum 21 through the steam riser 23, and be above the cooling water in the inner cavity of the steam drum 21. Excess water vapor in the steam drum 21 will overflow through the saturated steam pipe 25.

[0024] The water vapor overflowing from the saturated steam pipe 25 will flow into the inner cavity of the thermal insulation cover tube 51 through the steam delivery pipe 52 and the steam inlet 511, thereby insulating the gaseous electrolyte in the pipe through the outer wall of the electrolyte tail gas pipe 4 to prevent it from being cooled and liquefied. In actual application, the inner cavity of the thermal insulation cover tube 51 can be first filled with liquid water as an insulation medium. Liquid water not only has a larger specific heat capacity, but also does not introduce other impurities compared with other media. A discharge port 512 connected to the discharge pipe 53 is opened on the outer wall of the thermal insulation cover tube 51 to discharge the liquid water that is continuously accumulated in the inner cavity of the thermal insulation cover tube 51 and is cooled.

[0025] The heat preservation device 5 is used to recycle the water vapor containing a large amount of heat energy in the vaporization cooling device 2 of the high-temperature pyrolysis furnace 1, and to insulate the volatilized electrolyte in the electrolyte tail gas pipeline 4 of the low-temperature volatilization furnace 3, thereby preventing the electrolyte in the electrolyte tail gas pipeline 4 from liquefying due to a temperature drop, so that the electrolyte is always kept in a gaseous state, which is beneficial for the subsequent tail gas purification device and the recovery device to treat the tail gas. It can also prevent the liquefied electrolyte from adhering to the pipe wall of the electrolyte tail gas pipeline 4 and clogging the pipeline, thereby improving the working reliability of the low-temperature volatilization furnace 3, and at the same time realizing the recovery and reuse of the waste heat of the high-temperature pyrolysis furnace 1, avoiding energy waste, and achieving the good effect of energy saving and production cost saving. In addition, it can also prevent the water vapor in the vaporization cooling device 2 from overflowing, and also improve the safety performance of the vaporization cooling device 2 of the high-temperature pyrolysis furnace 1.

[0026] like Figure 2 As shown, in order to improve the heat conduction effect, a heat conducting layer 54 is provided between the heat preservation cover tube 51 and the outer wall of the electrolyte tail gas pipeline 4 to better conduct the heat of the water vapor in the inner cavity of the heat preservation cover tube 51 to the electrolyte in the electrolyte tail gas pipeline 4, thereby achieving a better heat preservation effect.

[0027] like Figure 2 As shown, in order to reduce the heat consumption of water vapor during transportation in the steam delivery pipe 52, the outer wall of the steam delivery pipe 52 is wrapped with a first insulation layer 522. In actual application, the first insulation layer 522 can be made of materials such as polyurethane and asbestos.

[0028] like Figure 2 As shown, a plurality of steam inlets 511 are provided on the outer wall of the heat-insulating cover tube 51 and are evenly spaced along the axial direction of the heat-insulating cover tube 51. A plurality of steam delivery branches 523 extend from the steam delivery pipe 52 and are adapted to be sealed and connected to the steam inlets 511, so that high-temperature water vapor can be diffused throughout the heat-insulating cover tube 51, thereby providing a more comprehensive and thorough heat-insulating environment for the electrolyte in the electrolyte exhaust pipe 4 surrounded by it.

[0029] like Figure 1 、 Figure 2As shown, the outlet of the discharge pipe 53 is connected to the inner cavity of the water supply pipe 24, and the liquid water that is continuously accumulated in the inner cavity of the heat-insulating cover tube 51 and cooled after insulation can be discharged into the steam drum 21 of the vaporization cooling device 2 of the high-temperature pyrolysis furnace 1, so as to facilitate the formation of a cooling and heat-insulating cycle between the vaporization cooling device 2 of the high-temperature pyrolysis furnace 1 and the electrolyte tail gas pipeline insulation device 4 of the low-temperature volatilization furnace 3. On the one hand, it can save water resources, and on the other hand, there is no need to set up an additional drainage device for the discharge pipe 53.

[0030] like Figure 2 As shown, in order to better monitor the temperature and capacity of water vapor and liquid water in the inner cavity of the thermal insulation cover tube 51, a liquid level sensor 55 and a temperature sensor 56 connected to the inner cavity of the thermal insulation cover tube 51 are connected to the outer wall of the thermal insulation cover tube 51. If it is detected that the temperature in the thermal insulation cover tube 51 is too low or the water level is too high, the drain valve 531 is opened to drain the water in the thermal insulation cover tube 51 so that more high-temperature water vapor can be filled into it to maintain a high-temperature environment and provide better insulation effect for the electrolyte.

[0031] like Figure 2 As shown, in order to reduce the volatilization loss of heat in the heat-insulating cover tube 51 to the outside, the outer wall of the heat-insulating cover tube 51 is wrapped with a second heat-insulating layer 57 made of polyurethane, asbestos or other materials.

[0032] like Figure 2 As shown, in order to more reliably and quickly transport the water vapor in the steam delivery pipe 52 to the heat preservation cover tube 51, the steam delivery pipe 52 is connected to a high-temperature resistant air pump 58.

[0033] like Figure 2 As shown, a first one-way valve 521 is installed near the steam inlet 51 of the steam delivery pipe 52. The flow direction of the first one-way valve 521 is from the steam delivery pipe 52 to the inner cavity of the thermal insulation cover tube 51 to prevent the water vapor in the inner cavity of the thermal insulation cover tube 51 from flowing back into the steam delivery pipe 52, thereby ensuring the working reliability of the thermal insulation device 5.

[0034] like Figure 2 As shown, a second one-way valve 524 is installed near the steam inlet 51 of the steam delivery branch pipe 523. The flow direction of the second one-way valve 524 is from the steam delivery branch pipe 523 to the inner cavity of the thermal insulation cover tube 51 to prevent the water vapor in the inner cavity of the thermal insulation cover tube 51 from flowing back into the steam delivery branch pipe 523 and the steam delivery pipe 52, thereby ensuring the working reliability of the thermal insulation device 5.

[0035] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat, characterized in that: The invention comprises: a high-temperature pyrolysis furnace (1), wherein the furnace tail portion of the high-temperature pyrolysis furnace (1) is provided with a vaporization cooling device (2) including a steam drum (21) for receiving water vapor, and a saturated steam pipe (25) is provided at the top of the steam drum (21); a low-temperature volatilization furnace (3), wherein the furnace head portion of the low-temperature volatilization furnace (3) is provided with an electrolyte tail gas pipeline (4); and a heat preservation device (5), wherein the heat preservation device (5) comprises a heat preservation cover tube (51) with a closed inner cavity provided on the outer wall of the electrolyte tail gas pipeline (4), a steam delivery pipe (52) connected to the outlet of the saturated steam pipe (25), a steam inlet (511) provided on the outer wall of the heat preservation cover tube (51), the steam inlet (511) being sealed and connected to the outlet of the steam delivery pipe (52), and a discharge outlet (512) connected to a discharge valve (531) provided on the wall of the heat preservation cover tube (51).

2. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: The bottom end of the steam drum (21) is provided with a cooling water delivery downpipe (22) and a steam riser (23) which are connected to the cooling pipe of the tail portion of the high-temperature pyrolysis furnace (1). A water supply pipe (24) is connected to a lower position on one side of the steam drum (21).

3. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: A heat-conducting layer (54) is provided between the heat-insulating cover tube (51) and the outer wall of the electrolyte tail gas pipeline (4).

4. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: The outer wall of the steam delivery pipe (52) is wrapped with a first heat-insulating layer (522).

5. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: The outer wall of the heat-insulating cover tube (51) is provided with a plurality of steam inlets (511) evenly spaced along the axial direction of the heat-insulating cover tube (51), and a plurality of steam delivery branches (523) adapted to be sealed and communicated with the steam inlets (511) are extended from the steam delivery pipe (52).

6. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 2, characterized in that: The outlet of the discharge pipe (53) is communicated with the inner cavity of the water supply pipe (24).

7. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1 or 2, characterized in that: The outer wall of the heat-insulating cover tube (51) is connected with a liquid level sensor (55) and a temperature sensor (56) which are in communication with the inner cavity of the heat-insulating cover tube (51).

8. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: The outer wall of the heat-insulating cover tube (51) is wrapped with a second heat-insulating layer (57).

9. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: The steam delivery pipe (52) is connected to a high-temperature resistant air extraction pump (58).

10. The high-temperature electrolyte tail gas pipeline insulation system utilizing waste heat according to claim 1, characterized in that: A first one-way valve (521) is installed near the steam inlet (511) of the steam delivery pipe (52). The flow direction of the first one-way valve (521) is from the steam delivery pipe (52) to the inner cavity of the heat preservation cover tube (51).

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