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The low temperature selective catalytic reduction (SCR) was used for deep De-NOx in a cement kiln. The SCR pilot plant with a flue gas of 10000 m 3 /h was designed and constructed. To meet the emission standard, selective non-catalytic reduction (SNCR) technique was carried out and the concentration NO x  in flue gas was ca. 270mg/m 3 . The De-NO x  efficiency of SCR decreased with the increase of space velocity and exceeded 77.7% without the ammonia injection. When space velocity was 2500h-1, the de-NO x  efficiency of SCR has been further improved by the addition of ammonia injection. After a long time of test, it suggested that the proposed De-NO x  technology scheme could stably and effectively control the NO x  emission in flue gas, and could meet the ultra-low emission standard.

Pilot test of the low temperature SCR technology in cement plant