CN218410751U - Roller kiln - Google Patents
Roller kiln Download PDFInfo
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- CN218410751U CN218410751U CN202222800701.6U CN202222800701U CN218410751U CN 218410751 U CN218410751 U CN 218410751U CN 202222800701 U CN202222800701 U CN 202222800701U CN 218410751 U CN218410751 U CN 218410751U
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- roller kiln
- blower
- roller
- flow path
- furnace
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Abstract
The utility model provides a roller kiln, it possesses inclosed furnace body that can control heating atmosphere and is used for carrying the roller by the thermal treatment thing in the stove, roller kiln's characterized in that constitutes for including: a heating zone disposed on the upstream side and including a heating device; and a cooling zone disposed downstream of the heating zone and having no heating device, wherein the roller kiln includes a blower for generating forced convection in the cooling zone. In the roller kiln according to the present invention, since the air blower for generating the forced convection in the cooling area is provided, the temperature of the powder in the sagger can be cooled in a short time in the cooling area.
Description
Technical Field
The utility model relates to a roller kiln.
Background
Conventionally, there is known a roller kiln including: a sealed furnace body capable of controlling a heating atmosphere; and a roller for conveying the object to be heat-treated in the furnace. Such a roller kiln is configured to include: a heating region disposed upstream in the conveying direction and including a heating device; and a cooling zone disposed downstream of the heating zone and having no heating device. As a cooling method in this cooling region, the following methods are known: (1) a method of injecting gas into the furnace from the bottom, upper and lower surfaces of the furnace and directly cooling the object to be heat-treated in the furnace with the gas; (2) a method of forming a cooling flow path on the outside of the top, bottom, or side surface of the furnace, or providing an indirect cooling pipe as a cooling flow path in the cross-sectional direction of the furnace, and indirectly cooling the inside of the furnace by flowing a cooling medium such as air or water through the cooling flow path.
However, (1) the method of injecting a gas into the furnace and directly cooling the furnace with the gas uses a large amount of gas, and thus is not economical. On the other hand, in the method of indirectly cooling the inside of the furnace, the time required for cooling is longer than that in the method (1). When the cooling rate in the cooling zone is low, the heat resistance of the conveyance mechanism is required, and the heat resistance of the apparatus for recovering the heat-treated material is also required. In addition, for example, when the heat-treated object is a ternary positive electrode material for a lithium battery, if cooling is insufficient, CO in the atmosphere will be present 2 React with the heat-treated material to produce Li 2 CO 3 In the subsequent powder washing step, li may not be removed 2 CO 3 Resulting in deterioration of battery characteristics. The heat-treated material is LFP (LiFePO) 4 ) In the case of (2), the heat-treated material is mixed with O in the atmosphere 2 The reaction occurs to generate iron oxide, which causes ignition of the battery.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
The utility model aims to provide a roller kiln capable of cooling a heat treatment object discharged from a furnace outlet in a short time.
Means for solving the problems
In order to solve the above problems, a first aspect of the present invention is a roller kiln including a sealed furnace body capable of controlling a heating atmosphere and a roller for transporting a heat-treated object in the furnace, the roller kiln being characterized in that,
the roller kiln comprises: a heating zone disposed on the upstream side and including a heating device; and a cooling zone disposed downstream of the heating zone and having no heating device,
the roller kiln is provided with a blower for generating forced convection in the cooling region.
The second mode of the utility model is characterized in that, in the roller kiln of the first mode,
the blower is positioned in the furnace and is arranged below the roller, and the air supply direction of the blower is from the lower part to the upper part.
A third mode of the present invention is characterized in that, in the roller kiln of the second mode,
the roller kiln is provided with a plurality of blowers in a conveying direction and/or a width direction of the roller kiln.
A fourth mode of the present invention is characterized in that, in the roller kiln of the first mode,
the air blower is arranged outside the furnace,
the roller kiln comprises: an exhaust flow path that exhausts gas from the inside of the roller kiln toward the blower; and an introduction flow path for introducing gas from the blower into the roller kiln.
A fifth mode of the present invention is characterized in that, in the roller kiln of the fourth mode,
the discharge flow path is provided on the upstream side in the conveying direction of the roller kiln, and the introduction flow path is provided on the downstream side in the conveying direction of the roller kiln.
The sixth mode of the present invention is characterized in that, in the roller kiln of the fourth mode,
the inlet of the inlet flow path is provided above or below the outlet of the outlet flow path.
A seventh mode of the present invention is characterized in that, in the roller kiln of the fourth mode,
the blower and the discharge flow path are provided with a heat exchanger.
An eighth aspect of the present invention is characterized in that, in the roller kiln of the seventh aspect,
the refrigerant of the heat exchanger is water.
A ninth mode of the present invention is characterized in that, in the roller kiln of the fourth mode,
the blower is arranged in the closed container.
A tenth mode of the present invention is characterized in that, in the roller kiln according to any one of the first to ninth modes,
the roller kiln is used for heat treatment of the anode material or the cathode material of the lithium ion battery, and the atmosphere temperature of the cooling area is below 100 ℃.
Effect of the utility model
In the roller kiln according to the present invention, since the air blower for generating the forced convection in the cooling area is provided, the temperature of the powder in the sagger can be cooled in a short time in the cooling area.
Drawings
Fig. 1 is a plan view of a roller kiln according to an embodiment of the present invention.
Fig. 2 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 1.
Description of the symbols
1 roller kiln
2 furnace body
3 roller
5 external circulation blower
6 stirring blower in furnace
20 cooling zone
51 discharge flow path
52 introduction flow path
53 heat exchanger
54 closed container
And S, sagger.
Detailed Description
Hereinafter, an embodiment of the roller kiln according to the present invention will be described with reference to the drawings. The present invention is not limited to the illustrated embodiments, and design changes can be made arbitrarily without departing from the scope of the technical scope described in the claims.
First, referring to fig. 1 and 2, a roller kiln 1 according to the present invention will be described by taking a roller kiln for heat treatment of a lithium ion battery positive electrode material as an example. The roller kiln 1 includes: a sealed furnace body 2 capable of controlling a heating atmosphere; and a roller 3 (a roller portion located outside the furnace is omitted in fig. 1) for conveying the object to be heat-treated contained in the sagger S in the furnace. The roller kiln 1 is configured to include: heating zones 18 and 19 disposed on the upstream side and provided with a heating device; and a cooling zone 20 disposed downstream of the heating zone, having no heating device, and having blowers 5 and 6 for generating forced convection in the cooling zone 20.
The heating zones 18 and 19 have: a region (temperature rise region) 18 controlled from near room temperature to a firing temperature according to a predetermined temperature rise curve; and a region (firing region) 19 in which the firing temperature is maintained for a certain time. Further, in the roller kiln 1 of the present embodiment, a gas replacement chamber 21 is provided upstream of the heating zone 18 and downstream of the cooling zone 20. The gas replacement chamber 21 includes: a plurality of airtight shutters 22 dividing the gas replacement chamber 21 into a plurality of indoor spaces; a decompression unit configured to decompress the indoor space; and a gas introduction unit for introducing a replacement gas into the depressurized indoor space.
In the present embodiment, an example is shown in which the external circulation blower 5 provided outside the furnace and the in-furnace stirring blower 6 provided inside the furnace are provided, but either blower may be provided. As the external circulation blower 5 and the internal stirring blower 6, known blowers can be used. Since the external circulation blower 5 is installed outside the furnace, a blower having low heat resistance can be used. In a roller kiln for heat treatment of a lithium ion battery positive electrode material, the atmospheric temperature of a cooling zone is usually 100 ℃ or lower.
The in-furnace stirring blower 6 is positioned in the furnace and provided below the roller 3, and the blowing direction of the blower is set to be a direction from below to above. The in-furnace stirring blower 6 is rotated by a motor 61. By providing such a stirring blower 6 in the furnace, the cooling rate of the heat-treated material is increased.
Further, a plurality of in-furnace stirring blowers 6 may be provided in the conveying direction and/or the width direction of the roller kiln 1. By providing a plurality of in-furnace stirring blowers 6, the cooling rate of the heat-treated material is further increased.
Further, the external circulation blower 5 is provided outside the furnace, and includes: an exhaust passage 51 for exhausting gas from the inside of the roller kiln 1 to the outside of the furnace circulation blower 5; and an introduction flow path 52 for introducing gas from the external circulation blower 5 into the roller kiln 1. By circulating the gas by the external circulation blower 5, the cooling rate of the heat-treated material can be increased and the amount of the gas used can be significantly reduced.
Here, the discharge flow path 51 is preferably provided on the upstream side in the transport direction of the roller kiln 1, and the introduction flow path 52 is preferably provided on the downstream side in the transport direction of the roller kiln 1. When the heat-treated object is a ternary lithium ion battery positive electrode material, the inlet of the inlet flow path 52 is preferably provided above the outlet of the outlet flow path 51. On the other hand, when the object to be heat-treated is LPF (lithium iron phosphate), the inlet of the inlet flow path 52 is preferably provided below the outlet of the outlet flow path 51.
Further, it is preferable that at least one of the external circulation blower 5, the discharge flow path 51, and the introduction flow path 52 is provided with a heat exchanger 53. By providing the heat exchanger 53, the cooling efficiency is further improved. As the heat exchanger 53, a known heat exchanger can be used, and the refrigerant may be gas such as air or liquid such as water.
Further, the external circulation blower 5 is preferably provided in the closed casing 54. For example, the external circulation blower 5 including the motor is provided in the sealed container 54, and the lead-out is only an electric wire to secure the sealing property. By providing the external circulation blower 5 in the closed casing 54, gas leakage and gas contamination can be prevented.
In the roller kiln 1 according to the present embodiment, since the blowers 5 and 6 for generating the forced convection in the cooling zone 20 are provided, the temperature of the powder in the sagger S can be cooled in the cooling zone 20 in a short time.
Claims (10)
1. A roller kiln comprising a sealed furnace body capable of controlling a heating atmosphere and a roller for conveying a material to be heat-treated in the furnace,
the roller kiln comprises: a heating zone disposed on the upstream side and including a heating device; and a cooling zone disposed downstream of the heating zone and having no heating device,
the roller kiln is provided with a blower for generating forced convection in the cooling region.
2. The roller kiln according to claim 1,
the blower is positioned in the furnace and is arranged below the roller, and the air supply direction of the blower is from the lower part to the upper part.
3. The roller kiln according to claim 2,
the roller kiln is provided with a plurality of blowers in a conveying direction and/or a width direction of the roller kiln.
4. The roller kiln according to claim 1,
the blower is arranged outside the furnace,
the roller kiln comprises: an exhaust flow path that exhausts gas from the inside of the roller kiln toward the blower; and an introduction flow path for introducing gas from the blower into the roller kiln.
5. The roller kiln according to claim 4,
the discharge flow path is provided on the upstream side in the conveying direction of the roller kiln, and the introduction flow path is provided on the downstream side in the conveying direction of the roller kiln.
6. The roller kiln according to claim 4,
the inlet of the inlet flow path is provided above or below the outlet of the outlet flow path.
7. The roller kiln according to claim 4,
the blower and the discharge flow path are provided with a heat exchanger.
8. The roller kiln according to claim 7,
the refrigerant of the heat exchanger is water.
9. The roller kiln according to claim 4,
the blower is arranged in the closed container.
10. The roller kiln according to any one of claims 1 to 9,
the roller kiln is used for heat treatment of the anode material or the cathode material of the lithium ion battery, and the atmosphere temperature of the cooling area is below 100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222800701.6U CN218410751U (en) | 2022-10-24 | 2022-10-24 | Roller kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222800701.6U CN218410751U (en) | 2022-10-24 | 2022-10-24 | Roller kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218410751U true CN218410751U (en) | 2023-01-31 |
Family
ID=85005947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222800701.6U Active CN218410751U (en) | 2022-10-24 | 2022-10-24 | Roller kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218410751U (en) |
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2022
- 2022-10-24 CN CN202222800701.6U patent/CN218410751U/en active Active
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