1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, China 2. Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou 310012, China 3. Zhejiang Environmental Technology Limited Company, Hangzhou 311100, China
The effects of flue gas temperature, inlet NOx mass concentration, ammonia-nitrogen ratio (NSR), catalyst loading and ash deposit time on the selective catalytic reduction (SCR) process were analyzed for the removal of nitrogen oxides (NOx) from cement furnace kiln. The characteristics of the SNCR-SCR combined denitrification process in cement furnaces were analyzed. The SNCR-SCR combined denitrification system of 10 000 m3/h was established based on a cement clinker production line in Zhejiang Province to strengthen the flue gas denitrification process by introducing an SCR device at the back end of a supporting SNCR denitrafication device. Results showed that the NOx emission mass concentration and ammonia mass concentration were 23.4 mg/m3 and 0.98 mg/m3 after continuous operation of SCR under 0.85~1.00 NSR, 8.1 m3 catalyst dosage when the flue gas volume was 10 000 m3/h with an inlet NOx mass concentration of 200~320 mg/m3 at 340 °C. The SCR segment denitrafication efficiency can reach 90.4%. These measured NOx emission mass concentration and ammonia escape mass concentration in the pilot test are far superior to those in the “Cement Industry Air Pollutant Emission Standard” (GB4915—2013), which proves that ultra-low emissions of the main pollutants in the flue gas of cement furnace can be realized.
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