Sintering furnace

Abstract

The utility model provides a firing furnace, which comprises a gas supply path (2) for supplying atmosphere gas into the furnace as supply gas; a gas discharge path (3) for discharging gas in the furnace as exhaust gas; and an exhaust gas cooling device that is provided in the gas discharge path and cools the exhaust gas, the exhaust gas cooling device including a heat exchange device (4) that exchanges heat between the exhaust gas and the supply gas. According to the firing furnace provided by the utility model, the corrosion resistance of the gas discharge path can be ensured, and the energy efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a sintering furnace with an exhaust cooling device. Background Art

[0002] In the past, for example, in a firing furnace for ternary lithium-ion battery materials, an atmospheric gas such as O2 was supplied into the firing furnace. In such a firing furnace, since an atmospheric gas at room temperature is supplied into the firing furnace, a large amount of heat is required to increase the temperature in the furnace and maintain the high temperature. In addition, in such a firing furnace, the exhaust gas discharged sometimes contains corrosive substances, etc., so in order to prevent corrosion of the gas exhaust path, an exhaust cooling device for cooling the exhaust gas is provided in the gas exhaust path. In a firing furnace equipped with such an exhaust cooling device, it is required to ensure the corrosion resistance of the gas exhaust path, and to be able to reduce energy consumption and improve energy efficiency. Utility Model Content

[0003] Issues to be solved by utility models

[0004] Therefore, an object of the present invention is to provide a sintering furnace equipped with an exhaust gas cooling device which can ensure the corrosion resistance of a gas exhaust path and improve energy efficiency.

[0005] Technical solutions to solve problems

[0006] In order to solve the above-mentioned problems, the first mode of the present invention is a sintering furnace (1), characterized in that the sintering furnace (1) comprises: a gas supply path (2) which supplies atmosphere gas as supply gas into the furnace; a gas exhaust path (3) which exhausts the gas in the furnace as exhaust gas; and an exhaust gas cooling device which is arranged in the gas exhaust path and cools the exhaust gas.

[0007] The exhaust gas cooling device comprises a heat exchange device (4) for performing heat exchange between the exhaust gas and the supply gas.

[0008] Furthermore, according to the sintering furnace (1) according to the first aspect, in a second aspect of the present invention, it is characterized in that

[0009] The exhaust gas cooling device includes a first heat exchange device (5) arranged on the upstream side, and a second heat exchange device (4) arranged on the downstream side.

[0010] Furthermore, according to the sintering furnace (1) according to the second aspect, in a third aspect of the present invention, it is characterized in that

[0011] The first heat exchange device performs heat exchange between the exhaust gas and liquid.

[0012] Furthermore, according to the sintering furnace (1) according to the third aspect, in a fourth aspect of the present invention, it is characterized in that

[0013] The temperature of the exhaust gas on the upstream side of the first heat exchange device is 600° C. or less,

[0014] The temperature of the exhaust gas on the downstream side of the first heat exchange device is 300° C. or less.

[0015] Furthermore, according to the sintering furnace (1) according to the fourth aspect, in a fifth aspect of the present invention, it is characterized in that

[0016] The gas exhaust passage (31, 32) on the upstream side of the first heat exchange device is made of SUS316L or SUS310S, or an inner surface ceramic material.

[0017] Furthermore, according to the sintering furnace (1) according to the fourth aspect, in a sixth aspect of the present invention, it is characterized in that

[0018] The temperature of the supply gas on the downstream side of the second heat exchange device is 100° C. or higher.

[0019] Furthermore, according to the sintering furnace (1) according to any one of the first to sixth aspects, in a seventh aspect of the present invention, it is characterized in that

[0020] The sintering furnace is a continuous sintering furnace, comprising a heating area (11), a heat-averaging area (12) and a cooling area (13).

[0021] Furthermore, according to the sintering furnace according to the seventh aspect, in an eighth aspect of the present invention, it is characterized in that:

[0022] The gas supply path includes a heating gas supply path (2) for supplying heated atmosphere gas, and a non-heating gas supply path (8) for supplying unheated atmosphere gas.

[0023] The heating gas supply path is connected to the heating area and / or the uniform heating area of ​​the sintering furnace.

[0024] The non-heating gas supply path is connected to the cooling zone of the sintering furnace.

[0025] Furthermore, according to the sintering furnace according to the seventh aspect, in a ninth aspect of the present invention, it is characterized in that

[0026] The sintering furnace is a continuous sintering furnace for ternary lithium-ion battery materials.

[0027] Utility Model Effect

[0028] According to the present invention, the exhaust gas cooling device includes the heat exchange device that performs heat exchange between the exhaust gas and the supply gas, so that the corrosion resistance of the gas exhaust path can be ensured and the energy efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a sintering furnace according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Hereinafter, a sintering furnace 1 according to an embodiment of the present invention will be described by taking a roller kiln for ternary lithium-ion battery materials as an example. The sintering furnace 1 is a continuous sintering furnace including a heating area 11, a heat-saturating area 12, and a cooling area 13. The sintering furnace 1 includes: a gas supply path 2, which supplies an atmospheric gas as a supply gas into the furnace; a gas exhaust path 3, which exhausts the gas in the furnace as an exhaust gas; and an exhaust gas cooling device, which is provided in the gas exhaust path 3 and cools the exhaust gas.

[0031] The exhaust gas cooling device includes a first heat exchange device 5 disposed on the upstream side, and a second heat exchange device 4 disposed on the downstream side. As the first heat exchange device 5 and the second heat exchange device 4, known heat exchange devices can be used. It is preferred to use a heat exchange device that performs heat exchange between the exhaust gas and the liquid as the first heat exchange device 5, and to use a heat exchange device that performs heat exchange between the exhaust gas and the supply gas as the second heat exchange device 4. By using a gas-liquid heat exchange type heat exchange device as the first heat exchange device 5, the exhaust gas can be quickly cooled and the corrosion of the gas exhaust path can be effectively suppressed.

[0032] The gas supply path includes a heating gas supply path 2 for supplying heated atmosphere gas, and a non-heating gas supply path 8 for supplying unheated atmosphere gas. The heating gas supply path 2 includes: a heating gas supply path 21 on the upstream side of the second heat exchange device 4, a heating gas supply path 22 on the downstream side of the second heat exchange device 4, and a plurality of heating gas supply paths 23 branching from the heating gas supply path 22 as the main pipe and connected to the sintering furnace 1 respectively. The non-heating gas supply path 8 branches from the heating gas supply path 21 on the upstream side of the second heat exchange device 4. In the present embodiment, an example is shown in which the heating gas supply path 2 is connected to substantially the entire area of ​​the heating region 11 and the uniform heating region 12, and the non-heating gas supply path 8 is connected to the cooling region 13. It should be noted that the heating gas supply path 2 may also be provided only in the heating region 11.

[0033] The gas exhaust path 3 includes gas exhaust paths 31 and 32 on the upstream side of the first heat exchange device 5, a gas exhaust path 33 on the downstream side of the first heat exchange device 5 and the upstream side of the second heat exchange device 4, and a gas exhaust path 34 on the downstream side of the second heat exchange device 4. The gas exhaust path on the upstream side of the first heat exchange device 5 includes a gas exhaust path 32 that serves as a main pipe and a plurality of gas exhaust paths 31 that serve as branch pipes. Blowers 91 and 92 are connected to the gas exhaust path 3. By driving the blowers 91 and 92, the exhaust gas is blown toward the gas exhaust path 3. Firing The gas is discharged to the outside of the furnace 1. In the present embodiment, the gas discharge path 3 is connected to substantially the entire heating region 11 and the uniform heating region 12. However, the gas discharge path 3 may be provided only in the heating region 11.

[0034] In order to effectively suppress corrosion of the gas exhaust path, it is preferred that the temperature of the exhaust gas on the upstream side of the first heat exchange device 5 is 600° C. or less, and the temperature of the exhaust gas on the downstream side of the first heat exchange device 5 is 300° C. or less. Here, “the temperature of the exhaust gas on the upstream side of the first heat exchange device 5” refers to the temperature of the exhaust gas at the inlet of the first heat exchange device 5, and “the temperature of the exhaust gas on the downstream side of the first heat exchange device 5” refers to the temperature of the exhaust gas at the outlet of the first heat exchange device 5.

[0035] In order to effectively suppress corrosion of the gas exhaust path, the gas exhaust paths 31 and 32 on the upstream side of the first heat exchange device 5 are preferably made of SUS316L or SUS310S.

[0036] In addition, from the viewpoint of improving the energy efficiency of the sintering furnace 1, the temperature of the supply gas on the downstream side of the second heat exchange device 4 is preferably 100° C. or higher. Here, “the temperature of the supply gas on the downstream side of the second heat exchange device 4” refers to the temperature of the supply gas at the outlet of the second heat exchange device 4.

[0037] The nitrogen gas supplied to the sintering furnace 1 is branched to the heating gas supply path 2 and the non-heating gas supply path 8 on the upstream side of the second heat exchange device 4. The supply gas of the heating gas supply path 2 is heated by the second heat exchange device 4 and supplied to the heating area 11 and the uniform heating area 12 of the sintering furnace 1. The supply gas of the non-heating gas supply path 8 is supplied to the cooling area 13 of the sintering furnace 1 at room temperature. The exhaust gas discharged from the heating area 11 and the uniform heating area 12 is cooled to below 300°C in the first heat exchange device 5, and then introduced into the second heat exchange device 4, and heat exchange is performed between the exhaust gas and the supply gas. Thereafter, the exhaust gas is discharged to the outside of the system of the sintering furnace 1.

[0038] According to the sintering furnace 1 of this embodiment, as the exhaust gas cooling device, the second heat exchange device 4 for performing heat exchange between the exhaust gas and the supply gas is provided, so that the corrosion resistance of the gas exhaust path 3 can be ensured and the energy efficiency can be improved. In addition, since the first heat exchange device 5 of the gas-liquid heat exchange type is provided on the upstream side of the second heat exchange device 4, the exhaust gas can be rapidly cooled and the corrosion of the gas exhaust path 3 can be effectively suppressed. It should be noted that the present invention is not limited to the above-mentioned embodiment, and can be appropriately changed within the scope of the gist thereof.

[0039] Description of Reference Numerals

[0040] 1: Firing furnace

[0041] 2: Heating gas supply path (gas supply path)

[0042] 3: Gas exhaust path

[0043] 8: Non-heating gas supply path (gas supply path)

[0044] 4: Second heat exchange device (exhaust cooling device)

[0045] 5: The first heat exchange device (exhaust cooling device)

[0046] 11: Heating area

[0047] 12: Heat distribution area

[0048] 13: Cooling area.

Claims

1. A sintering furnace, characterized in that: The sintering furnace comprises: a gas supply path (2) for supplying an atmosphere gas as a supply gas into the furnace; a gas exhaust path for exhausting the gas in the furnace as an exhaust gas; and an exhaust gas cooling device provided in the gas exhaust path for cooling the exhaust gas. The exhaust gas cooling device comprises a heat exchange device (4) for performing heat exchange between the exhaust gas and the supply gas.

2. The sintering furnace according to claim 1, characterized in that: The exhaust gas cooling device includes a first heat exchange device (5) arranged on the upstream side, and a second heat exchange device (4) arranged on the downstream side.

3. The sintering furnace according to claim 2, characterized in that: The first heat exchange device performs heat exchange between the exhaust gas and liquid.

4. The sintering furnace according to claim 3, characterized in that: The temperature of the exhaust gas on the upstream side of the first heat exchange device is 600° C. or less, The temperature of the exhaust gas on the downstream side of the first heat exchange device is 300° C. or less.

5. The sintering furnace according to claim 4, characterized in that: The gas exhaust path on the upstream side of the first heat exchange device is made of SUS316L or SUS310S or an inner surface ceramic material.

6. The sintering furnace according to claim 4, characterized in that: The temperature of the supply gas on the downstream side of the second heat exchange device is 100° C. or higher.

7. The sintering furnace according to any one of claims 1 to 6, characterized in that: The sintering furnace is a continuous sintering furnace, comprising a heating area (11), a heat-averaging area (12) and a cooling area (13).

8. The sintering furnace according to claim 7, characterized in that: The gas supply path includes a heating gas supply path (2) for supplying heated atmosphere gas, and a non-heating gas supply path (8) for supplying unheated atmosphere gas. The heating gas supply path is connected to the heating area and / or the uniform heating area of ​​the sintering furnace. The non-heating gas supply path is connected to the cooling zone of the sintering furnace.

9. The sintering furnace according to claim 7, characterized in that: The sintering furnace is a continuous sintering furnace for ternary lithium-ion battery materials.

Images