Coke Oven Body Structure: Coke oven is a thermal equipment for dry distillation of coal to obtain coke and chemical products. It is mainly composed of carbonization chamber, combustion chamber, furnace top, chute, regenerator and small flue. As shown in the figure.
(1) Refractory for carbonization chamber. The carbonization chamber works periodically. During coal loading, the furnace wall surface temperature drops to about 600 ℃, and at the end of coking, the furnace wall surface temperature rises to 1000 ~ 1100 ℃. Therefore, the wall and bottom of the carbonization chamber are built with silica bricks. Due to the sudden change of temperature at both ends of the carbonization chamber when the furnace door is opened, the temperature drops from 1000 ℃ to below 500 ℃, exceeding the temperature limit of silicon brick volume stability (573 ℃), therefore, the furnace head should be made of products with good thermal shock resistance. In the past, clay bricks were mostly used, but now it tends to be built with high-quality high alumina bricks, sillimanite bricks and hongzhushi bricks.
(2) Refractory for combustion chamber. The combustion chamber and the carbonization chamber share the furnace wall, and the bricks are the same as those of the carbonization chamber.
(3) Refractory for furnace top. Due to large temperature fluctuation around the coal loading hole on the furnace top, clay bricks are used for masonry, and silica bricks are used for other parts.
(4) Refractory for chute. The chute connects the combustion chamber with the regenerator, and the brick structure is required to be stable and resistant to thermal stress. Clay bricks are used for small coke ovens, and silica bricks are used for large and medium coke ovens.
(5) Refractory for regenerator. The single vertical wall, partition wall, bottom and lattice brick masonry of small coke oven regenerator are built with clay bricks, and the middle and upper masonry of large and medium coke oven regenerator are all built with silica bricks to make the coke oven expand evenly as a whole.
(6) Refractory for small flue. The small flue is located at the bottom of the regenerator and is connected with the flue. All small flues are lined with clay bricks.
In general, silica brick is the main refractory used in coke ovens all over the world. Coke oven silica brick requires accurate overall dimensions, high enough bulk density, thermal conductivity, good high temperature creep and high temperature strength; The phase composition in the brick is mainly scaly quartz, and the less residual quartz, the better.