The coke oven is divided into the furnace top, combustion chamber and carbonization chamber, ramp area and heat storage chamber.
When the coke oven is built, the bottom part is made of refractory concrete as the foundation. Other parts use silica bricks, semi-silica bricks, clay bricks, lightweight insulation bricks, sillimanite bricks and some refractory castables. Other parts use red bricks for construction, which are not included in the list of refractory materials. Most of them are selected by Party A nearby.
The amount of silica bricks used in the lining of the coke oven is the largest, and silica bricks belong to the acidic series products. The expansion coefficient is large, while the relative expansion of semi-silica bricks is relatively small after heating. Semi-silica bricks can reduce the erosion of slag on the lining. The expansion coefficient of semi-silica bricks is between clay bricks and silica bricks, and the ability to resist acidic slag is strong.
The coke oven heat storage chamber uses clay checker bricks, and there are also low-porosity clay checker bricks. Low-aluminum checker bricks are used in the upper part of the heat storage chamber, semi-silica bricks are used in the middle part, and clay bricks are used in the upper part. The single wall, main wall and partition wall of the coke oven regenerator are built with silica bricks, and the small flue, flue and chimney are lined with clay bricks. The small flue is located at the bottom of the regenerator and connected to the branch flue with cement expanded perlite bricks as insulation.
The temperature of the carbonization chamber furnace wall is 500-1100℃. The large temperature difference will produce thermal stress, causing cracks in the lining refractory bricks. Since this part is subject to fuel pressure, mechanical wear and impact, as well as erosion and deposition consumption, this part is built with dense special-shaped silica bricks. The furnace heads at both ends of the carbonization chamber, because the furnace door is often opened and closed, the temperature will drop sharply, so clay bricks, high-alumina bricks, andalusite bricks with good earthquake resistance should be used for masonry. The temperature of the furnace door on one side of the carbonization chamber fluctuates greatly. It can be built with clay bricks or cordierite bricks or refractory castables, and the outer shell should be filled with thermal insulation materials.
The combustion chamber consists of furnace wall, furnace bottom and furnace top. The furnace wall is shared with the carbonization chamber and needs to prevent gas leakage. The working layer of the combustion chamber is built with silica bricks, the top cover is built with clay bricks or silica bricks, the small coke oven cover is built with clay bricks, and the large cover is built with silica bricks.
The chimney and dry quenching device are built with clay bricks. Add a filling layer on the top of the furnace, and lay clay bricks, floating bead bricks, and diatomaceous earth insulation bricks in turn, and take sealing and waterproofing measures.
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