Furnace end wall structure of graphitization furnace

Abstract

The utility model discloses a furnace end wall structure of a graphitization furnace, which comprises heat-resistant pouring blocks symmetrically arranged at the front end and the rear end in the plane direction, the heat-resistant pouring blocks are used as a frame, and a clay brick masonry layer, a packing layer and a conductive wall are respectively arranged in the frame from the outer side to the inner side of a furnace end wall. The two sides of the conductive wall are each provided with a carbon block enclosure masonry and a high-alumina brick enclosure masonry, and the back of each high-alumina brick enclosure masonry is attached to the clay brick masonry layer. According to the utility model, the furnace end wall structure is improved, so that in the high-temperature production process of the furnace, the heat transfer speed of the refractory bricks around the conductive wall can be accelerated by utilizing the characteristic of large heat conductivity coefficient of the high-alumina bricks, the heat is transferred out as soon as possible, the refractory bricks are prevented from being burnt and melted, and the heat-insulating filler is prevented from being mixed; and the service life of the furnace is prolonged. And meanwhile, it can be guaranteed that adjacent components are tightly attached together, gaps are avoided, and the stability of the structure is guaranteed.

Description

Technical Field

[0001] The utility model relates to a furnace head wall structure of a graphitization furnace, belonging to the technical field of graphitization furnaces. Background Art

[0002] At present, the graphitization process of lithium battery negative electrode materials is generally achieved through Acheson graphitization furnace. The furnace head wall and furnace tail wall of Acheson graphitization furnace are composed of graphite carbon "conductive wall" and refractory wall. The negative electrode material is placed in the core of the graphitization furnace through a crucible or box plate, and the crucible or box plate is filled with filler. The current passes through the "conductive wall" at the furnace head and furnace tail, the filler in the furnace core and the crucible or box plate, as well as the positive and negative busbars on the periphery to form a circuit. The negative electrode powder in the crucible or box plate reaches a high temperature and is graphitized during the power-on process of the graphitization furnace.

[0003] When the furnace is in production, due to the extremely high temperature of the graphitized coke filler at the end of the furnace and the "conductive wall", the interface temperature of the carbon block layer around the "conductive wall" and the surrounding refractory brick masonry layer is relatively high, resulting in the refractory bricks being melted and the filler in the thermal insulation layer leaking out, which shortens the life of the furnace. Summary of the invention

[0004] The purpose of the utility model is to provide a furnace head wall structure of a graphitization furnace. The utility model utilizes the high thermal conductivity of high-alumina bricks to accelerate the heat transfer speed of refractory bricks around the "conductive wall", so that the heat is transferred out as soon as possible, prevents the refractory bricks from being burned and the phenomenon of heat preservation filler being mixed, and prolongs the service life of the furnace.

[0005] The technical solution of the utility model: a furnace head wall structure of a graphitizing furnace, which includes heat-resistant casting blocks symmetrically arranged at the front and rear ends in the plane direction, and the heat-resistant casting blocks are used as a frame. From the outer side to the inner side of the furnace head wall, a clay brick masonry layer, a filler layer, and a conductive wall are respectively arranged in the frame, and carbon block enclosure masonry and high-aluminum brick enclosure masonry are arranged on both sides of the conductive wall, and the back of the high-aluminum brick enclosure masonry is bonded to the clay brick masonry layer; the high-aluminum brick enclosure masonry is an L-shaped structure, the outer side of which abuts against the heat-resistant casting block, the back is bonded to the clay brick masonry layer, and the inner side abuts against the carbon block enclosure masonry and the filler layer; the back of the heat-resistant casting block forms a widened structure protruding backwards.

[0006] In the furnace head wall structure of the aforementioned graphitization furnace, in the vertical direction, the bottom of the clay brick masonry layer is supported on the heat-resistant cast blocks and extends backward and upward to form the outer wall of the furnace, the bottom of the charcoal block enclosure masonry is supported on the clay brick masonry layer, a conductive wall is arranged in the middle of the charcoal block enclosure masonry, and a high-alumina brick enclosure masonry is also arranged on the top of the charcoal block enclosure masonry. The charcoal block enclosure masonry and the high-alumina brick enclosure masonry above it and the conductive wall form the inner wall of the furnace, and a filler layer is arranged between the outer wall and the inner wall of the furnace.

[0007] In the furnace head wall structure of the aforementioned graphitization furnace, the heat-resistant casting blocks are L-shaped structures in the horizontal and vertical directions, and the clay brick masonry layer constituting the outer wall of the furnace is a multi-step structure; in the horizontal direction, the heat-resistant casting blocks and the high-alumina brick surrounding masonry clamp the steps at the ends of the clay brick masonry layer; in the vertical direction, the bottom of the clay brick masonry layer is completely supported on the heat-resistant casting blocks.

[0008] Beneficial effects of the utility model: Compared with the prior art, the utility model improves the furnace head wall structure, so that during the high-temperature production process of the furnace, the furnace head wall structure can accelerate the heat transfer speed of the refractory bricks around the "conductive wall" by utilizing the characteristics of high thermal conductivity of high-aluminum bricks, so that the heat can be transferred out as soon as possible, preventing the refractory bricks from being burned and the phenomenon of heat preservation filler stringing, thereby extending the service life of the furnace. At the same time, it can ensure that adjacent components are closely fitted together to avoid gaps and ensure the stability of the structure.

[0009] The utility model has the advantages of simple structure, convenient construction and low implementation cost. After use, the furnace head wall structure is stable, the refractory bricks are not easy to be burned, the heat-insulating filler is not easy to be mixed, and there is no maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0011] Figure 2 for Figure 1 Schematic diagram of the top view structure.

[0012] Figure numerals: 1-conductive wall, 2-carbon block enclosure masonry, 3-high alumina brick enclosure masonry, 4-heat-resistant casting block, 5-clay brick block, 6-filling layer. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0014] Embodiment of the utility model: a furnace head wall structure of a graphitization furnace, such as Figure 1-2As shown, in the plane direction, it includes heat-resistant casting blocks 4 symmetrically arranged at the front and rear ends, with the heat-resistant casting blocks 4 as a frame, and from the outside to the inside of the furnace head wall, clay brick masonry layers 5, filler layers 6, and conductive walls 1 are respectively arranged in the frame, and carbon block enclosure masonry 2 and high-alumina brick enclosure masonry 3 are arranged on both sides of the conductive wall 1, and the back of the high-alumina brick enclosure masonry 3 is in contact with the clay brick masonry layer 5. The high-alumina brick enclosure masonry 3 is an L-shaped structure, with its outer side against the heat-resistant casting block 4, the back in contact with the clay brick masonry layer 5, and the inner side against the carbon block enclosure masonry 2 and the filler layer 6. This structure can well avoid the occurrence of cross-material in the filler layer 6, and can make full use of the high thermal conductivity of the high-alumina brick enclosure masonry 3 to accelerate the heat transfer speed and make the heat transfer out as soon as possible. The high-alumina brick enclosure masonry 3 is an L-shaped structure, with its outer side against the heat-resistant casting block 4, the back is in contact with the clay brick masonry layer 5, and the inner side against the carbon block enclosure masonry 2 and the filler layer 6. This structure can well avoid the filler of the filler layer 6 from being mixed, and can make full use of the high thermal conductivity of the high-alumina brick enclosure masonry 3 to speed up the heat transfer speed and make the heat transfer out as soon as possible. The back of the heat-resistant casting block 4 forms a widened structure that bulges backwards. This structure can improve the stability of the overall structure.

[0015] In the vertical direction, the bottom of the clay brick masonry layer 5 is supported on the heat-resistant cast block 4 and extends backward and upward to form the outer wall of the furnace. The bottom of the charcoal block enclosure masonry 2 is supported on the clay brick masonry layer 5. A conductive wall 1 is arranged in the middle of the charcoal block enclosure masonry 2. A high-alumina brick enclosure masonry 3 is also arranged on the top of the charcoal block enclosure masonry 2. The charcoal block enclosure masonry 2 and the high-alumina brick enclosure masonry 3 above it and the conductive wall 1 form the inner wall of the furnace. A filler layer 6 is arranged between the outer wall of the furnace and the inner wall of the furnace.

[0016] In the horizontal and vertical directions, the heat-resistant casting blocks 4 are both L-shaped structures, and the clay brick masonry layer 5 constituting the outer wall of the furnace is a multi-step structure; in the horizontal direction, the heat-resistant casting blocks 4 and the high-alumina brick surrounding masonry 3 clamp the steps at the ends of the clay brick masonry layer 5; in the vertical direction, the bottom of the clay brick masonry layer 5 constituting the outer wall of the furnace is completely supported on the heat-resistant casting blocks 4.

[0017] When the furnace head wall is built, the heat-resistant casting blocks 4 are cast as required on the basis of the previous construction. After the curing period, the clay brick masonry 5 on the inner and outer sides, the high-alumina brick enclosure masonry 3, the charcoal block enclosure masonry 2, the conductive wall 1, etc. are built from bottom to top. After the masonry reaches a certain height, the filler layer 6 is filled and tamped. The clay brick masonry 5 on the inner and outer sides, the high-alumina brick enclosure masonry 3, the charcoal block enclosure masonry 2, the conductive wall 1 are continued to be built from bottom to top. After the masonry reaches a certain height, the filler layer 6 is filled and tamped. The operation is repeated until the masonry is completed.

Claims

1. A furnace head wall structure of a graphitization furnace, characterized in that: In the plane direction, it includes a heat-resistant casting block (4) symmetrically arranged at the front and rear ends, with the heat-resistant casting block (4) as a frame, and from the outer side to the inner side of the furnace head wall, a clay brick masonry layer (5), a filler layer (6), and a conductive wall (1) are respectively arranged in the frame, and a carbon block enclosure masonry (2) and a high-alumina brick enclosure masonry (3) are arranged on both sides of the conductive wall (1), and the back of the high-alumina brick enclosure masonry (3) is bonded to the clay brick masonry layer (5); the high-alumina brick enclosure masonry (3) is an L-shaped structure, the outer side of which abuts against the heat-resistant casting block (4), the back is bonded to the clay brick masonry layer (5), and the inner side abuts against the carbon block enclosure masonry (2) and the filler layer (6); the back of the heat-resistant casting block (4) forms a widened structure protruding backwards.

2. The furnace head wall structure of a graphitization furnace according to claim 1, characterized in that: In the vertical direction, the bottom of the clay brick masonry layer (5) is supported on the heat-resistant cast block (4) and extends backward and upward to form the furnace outer wall. The bottom of the charcoal block enclosure masonry (2) is supported on the clay brick masonry layer (5). A conductive wall (1) is arranged in the middle of the charcoal block enclosure masonry (2). A high-aluminum brick enclosure masonry (3) is also arranged on the top of the charcoal block enclosure masonry (2). The charcoal block enclosure masonry (2) and the high-aluminum brick enclosure masonry (3) above it and the conductive wall (1) form the furnace inner wall. A filler layer (6) is arranged between the furnace outer wall and the furnace inner wall.

3. The furnace head wall structure of a graphitization furnace according to claim 2, characterized in that: In the horizontal and vertical directions, the heat-resistant casting blocks (4) are both L-shaped structures, and the clay brick masonry layer (5) constituting the outer wall of the furnace is a multi-step structure; in the horizontal direction, the heat-resistant casting blocks (4) and the high-alumina brick enclosure masonry (3) clamp the steps at the ends of the clay brick masonry layer (5); in the vertical direction, the bottom of the clay brick masonry layer (5) is completely supported on the heat-resistant casting blocks (4).

Images