The air speed in the tertiary air duct increases from 20m/s to over 30m/s. Due to the increased thermal-efficiency of coolers, the temperature of the tertiary air has been increased to over 950℃. The clinker dust under high temperature and high air speed deepens the abrasion of lining, which requires good abrasion-resistance for the lining in corners and valves.

     According to operating condition, own technics and product advantages, our group s ests to apply the silicon mullite compound bricks in the tertiary air duct, which can increase the abrasion-resistance, decrease the thermal-dissipation, and remarkably conserve energy and protect environment with ceramic tertiary air flashboards.