Selection of Refractories for Coal Injection Pipe of Cement Rotary Kiln

      The coal injection pipe is an independent fuel delivery system, and the pulverized coal and high-pressure air are mixed and transported by the coal injection pipe into the rotary kiln for combustion. The coal injection pipe is composed of internal precision air duct steel pipes, exposed to flames close to 1700°C, and working under the strong scouring environment of the secondary wind in the kiln for a long time, so a layer of castables needs to be poured on the outside of the coal injection pipe to cover the coal injection pipe. for protection. The castables for coal injection pipes are in direct contact with flames. Ordinary castables will shrink and crack at high temperatures, and will fall off quickly under the scour of high-pressure wind. The high temperature performance cannot meet the working conditions of coal injection pipes, so high temperature performance must be used. Excellent castable for coal injection pipe.

      The special castables for coal injection pipes produced by ZHENJIN REFRACTORIES are high-performance refractory castables made of high-strength materials such as corundum and mullite as aggregates and ultrafine powder as binders. It has the characteristics of good high temperature performance, high temperature strength, good integrity, no cracking, corrosion resistance and wear resistance, and the service life can generally be more than 6 months.