Abstract: A large number of nitrogen oxides (NOx) are produced in the process of hightemperature firing refractory materials in tunnel kiln. In order to meet the emission requirements of flue gas pollutants，flue gas treatment is necessary. Low temperature SCR denitrification (150 ～ 250 ℃ ) technology can better meet the requirements of flue gas pollution treatment of tunnel kiln used for firing refractory materials. Compared with traditional SCR denitrification，it reduces the investment of environmental protection equipment and experience cost.

Key words: Denitrification, Low temperature SCR catalyst, Tunnel kiln, Refractory materials