Abstract
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 m3/h was designed and constructed. To meet the emission standard, selective non-catalytic reduction (SNCR) technique was carried out and the concentration NOx in flue gas was ca. 270mg/m3. The De-NOx 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-NOx 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-NOx technology scheme could stably and effectively control the NOx emission in flue gas, and could meet the ultra-low emission standard.
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