Abstract: In view of the requirements of local emission standards，from the reality of gas tunnel kiln flue gas emissions，low-temperature SCR method is adopted to treat flue gas. Through the comparison before and after the transformation，SCR facilities have good denitration effect and stable operation，reaching the requirement of ultra-low flue gas emissions，which has certain popularization significance in tunnel kiln flue gas environmental protection treatment

Key words: Tunnel kiln, Flue gas treatment, SCR method