Liquid cooling spiral feeder and pyrolysis feeding system
By using a liquid-cooled spiral feeder in the lithium battery recycling process and using liquid-cooled medium for heat exchange, the problem of high powder temperature of lithium battery after pyrolysis is solved, efficient and safe material transportation is achieved, and working efficiency is improved.
Patent Information
- Application Number
- CN202422300328.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-20
AI Technical Summary
In the existing lithium battery recycling process, the powder temperature of the lithium battery after pyrolysis is high and needs to be cooled in batches before transporting, resulting in low working efficiency and the risk of ignition or damage to the equipment.
A liquid-cooled spiral feeder is designed, and the cooling and continuous transport of high-temperature materials are achieved by setting a liquid-cooled shell on the outside of the screw feeder and heat exchange using liquid-cooled medium (such as water, silicone oil or mineral oil).
It effectively reduces the temperature of the material, avoids the risk of fire or damage to the equipment, shortens the delivery time of high-temperature materials, and improves work efficiency.
Smart Images
Figure CN222974438U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waste lithium battery recycling, and particularly relates to a liquid-cooled screw feeder and a pyrolysis feeding system. Background Art
[0002] Waste lithium batteries contain a variety of valuable metals, various organic substances and other recyclable components. How to recycle lithium batteries safely and with high resource utilization is an important topic in the field of sustainable resource utilization. The existing waste lithium battery recycling process mainly includes steps such as crushing waste lithium batteries, followed by high-temperature pyrolysis, screening, and sorting to recover products such as black powder, copper, iron, and aluminum respectively.
[0003] Among them, generally, the crushed lithium battery particles are subjected to high-temperature pyrolysis in a pyrolysis furnace to obtain pyrolysis particles. After pyrolysis, a feeding device is needed to transport the pyrolysis particles in the pyrolysis furnace to other equipment for subsequent processes such as screening. Commonly used feeding devices include screw feeders. However, after pyrolysis, the surface temperature of the pyrolysis particles can reach above 450°C. If a conventional screw feeder is used to directly transport these high-temperature pyrolysis particles, there is a risk of damaging the equipment and causing fires, which is not conducive to safe production.
[0004] In order to reduce the safety hazards during the transportation of pyrolysis particles, in the existing waste lithium battery recycling process, the lithium battery particles are generally pyrolyzed in batches. After pyrolysis, the pyrolysis particles of this batch are centrally air-cooled or transferred to a specific container for cooling. After the temperature of the pyrolysis particles drops, a feeding device is used for transportation, which has the defects of long time consumption and low working efficiency. Summary of the Utility Model
[0005] Aiming at the technical problem that the temperature of the lithium battery powder after pyrolysis in the existing lithium battery recycling process is high, and it needs to be cooled in batches after pyrolysis and then transported by a feeding device, resulting in low working efficiency, the utility model provides a liquid-cooled screw feeder and a pyrolysis feeding system, which can cool the material during the transportation of high-temperature materials, avoid the material catching fire or damaging the equipment due to excessive temperature; can shorten the transportation time of high-temperature materials and improve the working efficiency.
[0006] In a first aspect, the utility model provides a liquid-cooled screw feeder, which includes a screw feeder body. A liquid-cooled outer shell is arranged outside the screw feeder body. A liquid-cooled inlet and a liquid-cooled outlet are arranged on the liquid-cooled outer shell. The liquid-cooled inlet is close to the discharge end of the screw feeder body, and the liquid-cooled outlet is close to the feed end of the screw feeder body; the liquid-cooled inlet is connected to a liquid-cooled inlet pipeline, and the liquid-cooled outlet is connected to a liquid-cooled outlet pipeline; a liquid inlet pump is arranged on the liquid-cooled inlet pipeline, and a liquid-cooled medium is stored in the liquid-cooled inlet pipeline.
[0007] The liquid cooling inlet of the liquid cooling housing is close to the discharge end of the screw feeder body, and the liquid cooling outlet is close to the inlet end of the screw feeder body. When in use, the flow direction of the liquid cooling medium is opposite to the conveying direction of the screw feeder body, which can ensure that the temperature of the condensing medium near the discharge end is relatively low and the temperature of the condensing medium near the feeding end is relatively high, achieving a good cooling effect on the high-temperature materials in the screw feeder.
[0008] Furthermore, a heat exchanger is connected to the liquid cooling outlet pipe. The heat exchanger is connected to the cold source pipe, and a coolant is stored in the cold source pipe. The liquid cooling medium heated in the liquid cooling housing can exchange heat with the coolant in the cold source pipe in the heat exchanger, improving the utilization rate of heat.
[0009] Furthermore, the liquid cooling medium is water, silicone oil or mineral oil.
[0010] In a second aspect, the present utility model provides a pyrolysis feeding system using the above liquid cooling screw feeder, including a pyrolysis furnace. A pyrolysis furnace tail gas outlet and a discharge port are provided on the pyrolysis furnace. The pyrolysis furnace tail gas outlet is connected to a first tail gas pipe, and the discharge port is connected to the liquid cooling screw feeder.
[0011] Furthermore, it further includes a tail gas cooling barrel. A liquid cooling medium is stored in the tail gas cooling barrel, and the first tail gas pipe extends into the tail gas cooling barrel; a cooling barrel gas outlet is provided on the top surface of the tail gas cooling barrel, and the cooling barrel gas outlet is connected to a second tail gas pipe, and the second tail gas pipe is connected to a tail gas treatment device. The first tail gas pipe can introduce the tail gas generated in the pyrolysis furnace into the tail gas cooling barrel for cooling and dust removal, and then enter the tail gas treatment device through the second tail gas pipe for harmless treatment, reducing potential safety hazards.
[0012] Furthermore, a cooling barrel inlet and a cooling barrel outlet are provided on the tail gas cooling barrel. The cooling barrel inlet is connected to the liquid cooling outlet pipe, and the cooling barrel outlet is connected to the liquid cooling inlet pipe. The liquid cooling medium in the tail gas cooling barrel can be conveyed to the liquid cooling inlet pipe under the action of a liquid inlet pump, pass through the liquid cooling housing and the liquid cooling outlet pipe in sequence, and return to the tail gas cooling barrel, realizing the circulation of the liquid cooling medium between the tail gas cooling barrel and the liquid cooling screw feeder, and improving the utilization rate of the liquid cooling medium.
[0013] Furthermore, a liquid level gauge is provided inside the tail gas cooling barrel.
[0014] Furthermore, the end of the first tail gas pipe extending into the tail gas cooling barrel is lower than the liquid level of the liquid cooling medium in the tail gas cooling barrel.
[0015] The beneficial effects of the present utility model are as follows:
[0016] The utility model provides a liquid-cooled housing arranged outside the spiral feeder body. The liquid-cooled housing is respectively connected to a liquid-cooled inlet pipeline and a liquid-cooled outlet pipeline. When conveying materials, a liquid-cooled medium in the liquid-cooled inlet pipeline can be conveyed into the liquid-cooled housing through a liquid inlet pump and discharged through the liquid-cooled outlet pipeline. Furthermore, during the process of conveying high-temperature materials, the temperature of the materials can be reduced through the heat exchange between the materials and the liquid-cooled medium, avoiding the risk of fire or equipment damage caused by excessive temperature of the materials; it can achieve the cooling and continuous conveying of materials, without waiting for a batch of materials to complete cooling before conveying, shortening the conveying time of high-temperature materials and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0018] Figure 1 It is a sectional view of the spiral feeder body and the liquid-cooled housing in Embodiment 1.
[0019] Figure 2 It is a structural schematic diagram of the pyrolysis feeding system in Embodiment 2.
[0020] In the figure, 1 - pyrolysis furnace, 11 - first tail gas pipeline, 2 - liquid-cooled spiral feeder, 21 - liquid-cooled inlet pipeline, 22 - liquid-cooled outlet pipeline, 23 - liquid inlet pump, 24 - liquid-cooled inlet port, 25 - liquid-cooled outlet port, 3 - tail gas cooling barrel, 31 - second tail gas pipeline, 32 - tail gas treatment device, 4 - heat exchanger, 41 - cold source pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0022] Embodiment 1
[0023] A liquid-cooled screw feeder, comprising a screw feeder body, a liquid-cooled housing is arranged outside the screw feeder body, a liquid-cooled liquid inlet 24 and a liquid-cooled liquid outlet 25 are arranged on the liquid-cooled housing, the liquid-cooled liquid inlet 24 is close to the discharge end of the screw feeder body, and the liquid-cooled liquid outlet 25 is close to the feed end of the screw feeder body; the liquid-cooled liquid inlet 24 is connected to a liquid-cooled liquid inlet pipe 21, the liquid-cooled liquid outlet 25 is connected to a liquid-cooled liquid outlet pipe 22, a liquid inlet pump is arranged on the liquid-cooled liquid inlet pipe 21, a liquid-cooled medium is stored in the liquid-cooled liquid inlet pipe 21, and the liquid-cooled medium is water;
[0024] A heat exchanger 4 is connected to the liquid-cooled liquid outlet pipe 22, the heat exchanger 4 is connected to a cold source pipe 41, and a coolant is stored in the cold source pipe 41, and the coolant is water.
[0025] Embodiment 2
[0026] A pyrolysis feeding system uses the liquid-cooled screw feeder in Embodiment 1, and includes a pyrolysis furnace 1. A pyrolysis furnace tail gas outlet and a discharge port are arranged on the pyrolysis furnace 1. The pyrolysis furnace tail gas outlet is connected to a first tail gas pipe 11, and the discharge port is connected to the liquid-cooled screw feeder 2;
[0027] It further includes a tail gas cooling barrel 3. A liquid level gauge is arranged in the tail gas cooling barrel 3, water is stored in the tail gas cooling barrel 3, the first tail gas pipe 11 extends into the tail gas cooling barrel 3, and one end of the first tail gas pipe 11 extending into the tail gas cooling barrel 3 is lower than the water surface in the tail gas cooling barrel 3; a cooling barrel gas outlet is arranged on the top surface of the tail gas cooling barrel 3, the cooling barrel gas outlet is connected to a second tail gas pipe 31, and the second tail gas pipe 31 is connected to a tail gas treatment device 32; a cooling barrel liquid inlet and a cooling barrel liquid outlet are arranged on the tail gas cooling barrel 3, the cooling barrel liquid inlet is connected to the liquid-cooled liquid outlet pipe 22, and the cooling barrel liquid outlet is connected to the liquid-cooled liquid inlet pipe 21.
[0028] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention / Any person familiar with the technical field of the present invention can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered within the protection scope of the present invention.
Claims
1. A liquid-cooled screw feeder, comprising a screw feeder body, characterized in that: A liquid cooling shell is arranged on the outside of the screw feeder body, and a liquid cooling inlet and a liquid cooling outlet are arranged on the liquid cooling shell. The liquid cooling inlet is close to the discharge end of the screw feeder body, and the liquid cooling outlet is close to the feed end of the screw feeder body; the liquid cooling inlet is connected to the liquid cooling inlet pipe, and the liquid cooling outlet is connected to the liquid cooling outlet pipe; a liquid inlet pump is arranged on the liquid cooling inlet pipe, and liquid cooling medium is stored in the liquid cooling inlet pipe.
2. The liquid-cooled screw feeder according to claim 1, characterized in that: A heat exchanger is connected to the liquid cooling outlet pipe, and the heat exchanger is connected to a cold source pipe, in which coolant is stored.
3. The liquid-cooled screw feeder according to claim 1, characterized in that: The liquid cooling medium is water, silicone oil or mineral oil.
4. A pyrolysis feeding system using the liquid-cooled screw feeder as claimed in claim 1, comprising a pyrolysis furnace, characterized in that: The pyrolysis furnace is provided with a pyrolysis furnace tail gas outlet and a material discharge port. The pyrolysis furnace tail gas outlet is connected to the first tail gas pipeline, and the material discharge port is connected to the liquid-cooled spiral feeder.
5. The pyrolysis feeding system according to claim 4, characterized in that: It also includes an exhaust gas cooling barrel, which contains liquid cooling medium, and a first exhaust gas pipeline extends into the exhaust gas cooling barrel; a cooling barrel air outlet is provided on the top surface of the exhaust gas cooling barrel, the cooling barrel air outlet is connected to the second exhaust gas pipeline, and the second exhaust gas pipeline is connected to the exhaust gas treatment device.
6. The pyrolysis feeding system according to claim 5, characterized in that: The tail gas cooling barrel is provided with a cooling barrel liquid inlet and a cooling barrel liquid outlet. The cooling barrel liquid inlet is connected to the liquid cooling outlet pipeline, and the cooling barrel liquid outlet is connected to the liquid cooling inlet pipeline.
7. The pyrolysis feeding system according to claim 5, characterized in that: A liquid level gauge is provided in the exhaust gas cooling barrel.
8. The pyrolysis feeding system according to claim 5, characterized in that: One end of the first exhaust pipe extending into the exhaust gas cooling barrel is lower than the liquid level of the liquid cooling medium in the exhaust gas cooling barrel.