1. Refractory material structure of the melting part of flat glass melting furnace
① The bottom bricks are made of large clay bricks, arranged with vertical and horizontal straight seams, and the thickness is generally 300mm. An expansion joint is concentrated every 4m in the length direction of the kiln, or the seams can be evenly distributed. The seams are evenly distributed in the width direction of the kiln, and the expansion joint is considered to be 5%o.
② The supporting stack bricks under the bottom bricks are made of low-porosity clay bricks. The width of the stack bricks should not be less than 150mm. The insulation materials filled between the stack bricks can be aluminum silicate fiber felt and asbestos-free calcium silicate board.
③ The bottom paving bricks are generally made of electric fused 33# zirconium corundum bricks, and sintered zirconium mullite bricks can also be used before the hot spot of the melting zone or all. The paving bricks should generally be arranged with staggered seams, and the length direction is concentrated at the expansion joints of the large bricks at the bottom of the pool. The size of the expansion joint is considered to be 6%o~7‰, and the width direction is concentrated on both sides.
④ The ramming material layer at the bottom of the pool is made of zircon ramming material or zirconium corundum ramming material, with a compression ratio of 1:2.4. The surface after ramming should have a strength of 6.5kg/cm2.
⑤ The pool wall bricks in the melting part should be vertically laid with whole bricks to minimize the horizontal seams of the pool wall. According to the required kiln age and material, 33#, 36# or 41# oxidation method quasi-shrinkage-free casting or inclined casting fused zirconium corundum brickshttps://www.nhglz.com/azsblock/ can be selected. Corner bricks should be 41# oxidation method shrinkage-free casting fused zirconium corundum bricks. The outside of the pool wall bricks can be sealed with zirconium ramming material or not. Clay bricks or high-alumina bricks and asbestos-free calcium silicate boards can be used for insulation.
⑥Hook bricks.
The hook bricks of the nozzle of the small furnace should be 33# oxidation method non-shrinkage casting fused zirconium corundum bricks.
The hook bricks of the breast wall of the melting area should be 33# oxidation method ordinary casting fused zirconium corundum bricks.
The hook bricks under the breast wall of the clarification area can be made of high-quality silica bricks.
There should be expansion joints between the hook bricks to prevent cracking, 1.5mm expansion joints between fused zirconium corundum bricks, and concentrated expansion joints between silica bricks and hook bricks.
⑦ Breast wall.
The breast wall of the melting area adopts 33# oxidation method ordinary casting fused zirconium corundum bricks, and is insulated with lightweight clay bricks and asbestos-free calcium silicate boards.
High-quality silica bricks can be used for the breast wall of the clarification area.
The vertical brick joints of the breast wall of the melting area should be designed as a curved seal structure, and the breast wall of the clarification area adopts a concentrated joint form with staggered joints inside and outside.
⑧ The large arch of the melting section should be made of high-quality silica bricks. The height of the arch brick is related to the arch span, generally 400-500mm. The length direction should be able to properly adjust the length of each arch section to reduce the types of arch bricks. The insulation of the large arch top should first use sealing materials, and then add lightweight silica bricks and plastic insulation materials.
⑨ Except for the TV hole bricks, which are sintered zircon bricks, the rest of the rear gable of the melting section should be made of high-quality silica bricks, and 25mm thick asbestos-free calcium silicate boards can also be added for insulation.
⑩ For the front gable of the melting section, according to the width of the kiln, an L-shaped hanging wall or a traditional independent arch supported front gable can be selected.
2. Refractory structure of cooling section of flat glass melting furnace
① The bottom bricks are made of clay bricks, arranged with vertical and horizontal straight seams, and the thickness is generally 300ram. An expansion joint is concentrated every 4m in the length direction of the kiln, or the seams can be evenly distributed. The seams are evenly distributed in the width direction of the kiln, and the expansion joint is considered to be 5‰.
② The supporting stack bricks under the bottom bricks are low-porosity clay bricks. The width of the stack bricks should not be less than 150mm. The insulation material filled between the stack bricks can be aluminum silicate fiber felt and asbestos-free calcium silicate board.
③ The bottom paving bricks of the cooling section of the melting furnace for producing high-grade glass should be made of electric-melted Xing alumina bricks, and the bottom paving bricks of the cooling section of the melting furnace for producing ordinary glass can be made of 33# oxidation method non-shrinkage cavity casting electric-melted jade bricks. Paving bricks should generally be arranged with staggered seams, and the length direction should be concentrated at the expansion joints of the large bricks at the bottom of the pool. The size of the expansion joint is considered to be 6‰~7‰, and the width direction should be concentrated on both sides.
④ The cooling part pool wall bricks are made of fused alumina bricks, and 33# oxidation method tilted cast fused zirconium corundum bricks can also be used.
⑤ The breast wall and hook bricks of the cooling part can both use BG-96 silica bricks, and the expansion joints are concentrated. The fine-tuning air hole bricks can use sintered zircon bricks.
⑥ The large arch of the cooling part uses high-quality silica bricks or BG-96 silica bricks. The arch brick height is related to the arch span, generally about 350mm, and no insulation.
⑦ The front gable of the cooling part uses high-quality silica bricks or BG-96 silica bricks, the rear gable uses BG-96 silica bricks, and the flat arch at the entrance of the middle flow channel uses fused alumina bricks or BG-96 silica bricks.
3. Refractory structure of small furnace, heat storage chamber and flue of flat glass melting furnace
(1) Small furnace
This part includes the flat arch of the small furnace fire mouth, small furnace stack, nozzle brick, nozzle brick stack, small furnace slope arch, straight arch, small furnace side wall, small furnace bottom and the small furnace mouth arch, wall and bottom connected to the heat storage chamber. Except for the nozzle brick and small furnace bottom, which use 33# oxidation method non-shrinkage cavity cast fused zirconium corundum brick, other places can use 33# oxidation method ordinary cast fused zirconium corundum brick. Zircon sealing material, high alumina insulation brick and high alumina plastic insulation material can be used for the insulation of the small furnace straight arch and inclined arch. Zircon sealing material and high alumina insulation brick or asbestos-free calcium silicate board can be used for the insulation of the small furnace side wall. Zircon brick, clay insulation brick and ceramic fiber board can be used for insulation under the small furnace bottom brick. P alumina brick can also be used for the small furnace mouth structure and its accessory breast wall.
(2) Regenerator
① Regenerator top arch. The regenerator arch top should be made of high-quality silica bricks, and the arch top insulation can be made of the same form and material as the melting section arch.
② Regenerator wall. The regenerator wall, including the partition wall, should have the same structure and material in the same horizontal section. The inner lining of the regenerator wall in the upper space of the lattice body should be made of high-quality silica bricks, plus lightweight silica bricks and sealed thermal insulation coatings or asbestos-free calcium silicate boards. The upper target strength and lining wall can also be made of directly bonded magnesia-chrome bricks, plus high-alumina thermal insulation bricks and coatings or asbestos-free calcium silicate boards.
The inner lining of the regenerator wall from the furnace bar to the top surface of the lattice body should be made of the same material as the lattice body at the same height section, or in the upper section or the middle upper section, use alkaline bricks one level lower than the lattice body material in the same section, use directly bonded magnesia-chrome bricks in the middle section, and use low-porosity clay bricks in the lower section.
Another method is to use direct bonded magnesia-chrome bricks for the upper and middle walls and low porosity clay bricks for the lower wall.
The wall of the heat storage chamber should be insulated and sealed. Clay insulation bricks or high-alumina insulation bricks should be used on the outer layer of the wall lining, and sealing insulation mud should be applied or asbestos-free calcium silicate board should be pasted.
The heat storage chamber wall below the grate leveling brick can be made of ordinary clay bricks, and clay insulation bricks can be used on the outer layer.
③ The heat storage chamber grid body. The grid body of the vertical heat storage chamber is divided into several sections from top to bottom due to different temperatures and atmospheres. Each section of the grid body is built with grid bricks of different materials.
For the lattice body without special requirements, the section with temperature between 1300 and 1100℃ should be built with high-purity magnesia bricks containing 97% and 95% MgO; the section with temperature between 1100 and 800℃ should be built with direct-bonded magnesia-chrome bricks and spinel bricks; the section with temperature below 800℃ can be built with low-porosity clay bricks.
The brick type of lattice bricks can be rectangular, cylindrical, and cross-shaped fused zirconium corundum bricks.
④ Regenerator grate arch. The lattice body of the regenerator is built entirely with sintered materials, and the grate arch leveling bricks can be made of high-strength and low-porosity clay bricks.
The lattice body of the regenerator is built entirely with cross-shaped fused zirconium corundum bricks, and its grate arch and leveling bricks need to be built with fused zirconium corundum bricks, and a layer of clay protective arch is added under the grate bar.
(3) Flue
The inner lining of the flue should be made of ordinary clay bricks, the outer lining should be made of clay insulation bricks, or clay sealing insulation paint should be applied. The outermost layer can be made of building red bricks and clay sealing insulation paint. The underground flue should be coated with a cement mortar waterproof layer.
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