In coke ovens, silica bricks are usually used as lining materials or thermal insulation materials. The specific applications are as follows:

1. Lining materials: The interior of the coke oven needs to withstand high temperatures and thermal shock, so refractory materials are required as linings. Silica bricks are often widely used in the construction of the inner walls of coke ovens due to their good high temperature resistance and thermal shock resistance. The silica brick lining can resist thermal expansion and thermal shock at high temperatures, protecting the structure of the coke oven from damage.

2. Heat insulation materials: Coke ovens need to maintain a high temperature environment, so heat insulation materials are also needed to reduce energy loss. Silica bricks are often used as the thermal insulation layer of coke ovens due to their low thermal conductivity and good thermal insulation properties. The silica brick thermal insulation layer can effectively reduce the heat loss of the coke oven, increase the temperature inside the furnace, and save energy.

3. Other applications: In addition to being used as linings and thermal insulation materials, silica bricks may also be used in other parts of coke ovens, such as bottom support structures, gas guide plates, etc. In these locations, silica bricks can provide good support and durability to ensure stable operation of the coke oven.

In general, the application of silica bricks in coke ovens is mainly to protect the furnace structure, improve fire resistance and save energy, and ensure that the coke oven can operate stably and efficiently.