What refractory materials are used in each part of the flat glass furnace?

1. The refractory structure of the melting part of the flat glass melting furnace

①The pool bottom bricks are made of large clay bricks, arranged with vertical and horizontal joints, and the thickness is generally 300mm. One expansion joint is set at intervals of about 4m in the kiln length direction, and the joints can also be distributed evenly. 5‰ is considered.

②The supporting stacking bricks under the pool bottom bricks are made of low-porosity clay bricks, and the width of the stacking bricks should not be less than 150mm. The insulating material filled between the stacking bricks can be made of aluminum silicate fiber felt and asbestos-free calcium silicate board.

③The paving bricks at the bottom of the pool are generally made of fused 33# zirconium corundum bricks, or sintered zirconium mullite bricks can be used before or all the hot spots in the melting zone. The paving bricks should generally be arranged in staggered seams, and the length direction corresponds to the expansion joints of the large bricks at the bottom of the pool. Focus on leaving joints, the size of expansion joints should be considered as 6% o ~ 7‰, and leave joints on both sides in the width direction.

④The ramming material layer at the bottom of the pool is made of zircon ramming material or zirconium corundum ramming material, the compression ratio is 1:2.4, and the surface after ramming should have a strength of 6.5kg/cm2.

⑤ The wall bricks of the melting part should be erected with a whole block of bricks to minimize the horizontal joints of the pool wall. According to the required kiln age and material, 33#, 36# or 41# oxidation method can be used for quasi-no shrinkage casting or inclined casting fused zirconium corundum bricks. Corner bricks should be fused zirconium corundum bricks cast by 41# oxidation method without shrinkage. The outside of the pool wall bricks can be sealed with zirconium ramming material or not. It can be insulated with clay bricks or high alumina bricks and non-asbestos calcium silicate boards.

⑥ Hook bricks.

Small furnace nozzle hook bricks should be cast fused zirconium corundum bricks without shrinkage 33# oxidation method.

The chest wall hook bricks in the melting area should be fused zirconium corundum bricks by 33# oxidation method.

High-quality silica bricks can be used for the hook bricks under the parapet in the clarification area.

There should be expansion joints between the hook bricks to prevent cracking, 1.5mm expansion joints should be left between the fused zirconium corundum bricks, and expansion joints should be left concentrated between the silica bricks and the hook bricks.

⑦ parapet.

The breast wall of the melting area is made of 33# oxidation method ordinary cast fused zirconium corundum bricks, and the exterior is pasted with light clay bricks and asbestos-free calcium silicate boards for heat preservation.

The parapet of the clarification area can be made of high-quality silica bricks.

The vertical brick joints of the breast wall in the melting area shall be designed as a curved seal structure, and the breast wall in the clarification area shall adopt the form of concentrated seam, with internal and external staggered joints.

⑧The large slats in the melting part should be made of high-quality silica bricks. The height of the slats is related to the slat span, generally 400-500mm. The length of the stiles should be properly adjusted in the length direction to reduce the types of bricks. The insulation of the large dome top should be sealed first, followed by lightweight silica bricks and plastic insulation materials.

⑨In addition to the sintered zircon bricks used for the TV hole bricks, the other gable walls of the melting part are made of high-quality silica bricks, and 25mm thick asbestos-free calcium silicate boards can also be added for heat preservation.

⑩ The front gable wall of the melting part, according to the width of the kiln, choose the L-shaped hanging wall or the front wall supported by the traditional independent kiln.

Second, the refractory structure of the cooling part of the flat glass melting furnace

①The pool bottom bricks are made of large clay bricks, arranged with vertical and horizontal joints, and the thickness is generally 300 ram. One expansion joint is set at intervals of about 4m in the kiln length direction, and the joints can also be evenly distributed. 5‰ is considered.

②The supporting stacking bricks under the pool bottom bricks are made of low-porosity clay bricks, and the width of the stacking bricks should not be less than 150mm. The insulating material filled between the stacking bricks can be made of aluminum silicate fiber felt and asbestos-free calcium silicate board.

③The bottom paving bricks of the cooling part of the melting furnace for producing high-grade glass should be fused Xing alumina bricks, and the bottom paving bricks of the cooling part of the melting furnace producing ordinary glass can be cast by 33# oxidation method without shrinkage. . Paving bricks should generally be arranged with staggered joints. The large brick expansion joints at the bottom of the pool correspond to concentrated joints in the length direction. The size of the expansion joints is considered as 6‰ to 7‰, and the width direction is concentrated on both sides.

④Fused  alumina bricks are used for the pool wall bricks in the cooling section, and fused zirconium corundum bricks can also be cast obliquely by 33# oxidation method.

⑤ BG-96 silica bricks can be used for the parapet wall and hook bricks of the cooling section, and expansion joints are concentrated, and sintered zircon bricks can be used for fine-tuning air hole bricks.

⑥The cooling part adopts high-quality silica bricks or BG-96 silica bricks.

⑦The front gable of the cooling part adopts high-quality silica brick or BG-96 silica brick, the rear gable adopts BG-96 silica brick, and the flat sill at the entrance of the middle flow channel adopts fused p-alumina brick or BG-96 silica brick.

3. Small furnace, regenerator, flue refractory structure of flat glass furnace

(1) Small furnace

This part includes the flat hoist, small furnace stack, nozzle brick, nozzle brick stack, small furnace slope hoist, straight hoist, small furnace side wall, small furnace bottom and small furnace mouth hoist and wall connecting the regenerator , and the bottom, except that the nozzle brick and the bottom of the small furnace use 33# oxidation method to cast fused zirconium corundum brick without shrinkage, other places can use 33# oxidation method to cast fused zirconium corundum brick. The thermal insulation of the straight and inclined slats of the small furnace can be made of zirconium sealing material, high-alumina thermal insulation brick and high-alumina plastic thermal insulation material, and the thermal insulation of the side wall of the small furnace can be made of zirconium sealing material and high-alumina thermal insulation bricks or without. Asbestos calcium silicate board. Zircon bricks, clay insulation bricks, and ceramic fiberboards can be used for insulation under the small furnace bottom bricks. P-alumina bricks can also be used for the last pair of small furnace mouth structure and its accessory chest wall.

(2) Regenerator

①The roof of the regenerator. The top of the regenerator should be made of high-quality silica bricks, and the heat preservation of the top of the heat can be of the same form and material as the large top of the melting part.

② regenerator wall. The structure and material of the regenerator walls including the partition walls are required to be the same 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 silicon alloy, plus light-weight silica brick and smeared with sealing and heat-insulating paint or pasted asbestos-free calcium silicate board. The upper target strength and lining walls can also be directly bonded with magnesia-chrome bricks, plus high-alumina insulation bricks and coatings or asbestos-free calcium silicate boards.

The inner lining of the regenerator wall is within the height range from the top of the grate to the top surface of the lattice body. For low-grade alkaline bricks, direct-bonded magnesia-chrome bricks are used in the middle section, and clay bricks with low porosity are used in the lower section.

Another method of selection is to use direct-bonded magnesia-chrome bricks for the upper and middle walls, and low-porosity clay bricks for the lower walls.

The wall of the regenerator should be strengthened for thermal insulation and sealing. The outer layer of the wall should be lined with clay thermal insulation bricks or high alumina thermal insulation bricks.

Common clay bricks can be used for the regenerator wall below the grate leveling bricks, and clay insulation bricks are used for the outer layer.

③ Regenerator lattice. The lattice body of the vertical regenerator is divided into several sections from top to bottom due to different temperatures and atmospheres, and each section of the lattice body is built with lattice bricks of different materials.

For lattices without special requirements, in the section with a temperature of 1300-1100 °C, high-purity magnesia bricks containing 97% and 95% of MgO should be used for building; in the section with a temperature of 1100-800 °C, directly bonded magnesia-chrome bricks should be used. , Spinel bricks; for sections where the temperature is below 800 °C, low porosity clay bricks can be used.

The brick type of the checkered brick can be selected from rectangular, tubular brick and cross-shaped fused zirconium corundum brick.

④ Regenerator grate. The grids of the regenerator are all made of sintered materials, and the leveling bricks of the grate can be made of high-strength and low-porosity clay bricks.

The lattice body of the regenerator is entirely built with cross-shaped fused zirconium corundum bricks, and the furnace bars and leveling bricks need to be built with fused zirconium corundum bricks, and a layer of clay guard bars is added under the furnace bars. .

(3) Flue

The lining of the flue should be made of ordinary clay bricks, clay-based heat-insulating bricks, or smeared with clay-based sealing and heat-insulating paint. The outermost layer can be built with red bricks and smeared with clay-based heat-insulating paint. The underground flue should be covered with cement. Mortar waterproofing layer.

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