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Jiangnan Environmental Technology Inc.

JET makes coal as clean as natural gas

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Selective catalytic reduction (SCR)

Process mechanism

In the SCR denitrification process, NOx in the flue gas reacts selectively with the reductant and produces N2 and H2O with the presence of V2O5/TiO2 based catalysts under the temperature of 300 to 420 ℃. The reductant is typically anhydrous ammonia, aqueous ammonia or urea. The reaction using ammonia (anhydrous/aqueous) as the reductant for a selective catalytic reduction process can be described as the following:

4NH3+4NO+O2 →4N2+6H2O        (1)

4NH3+2NO2+O2 →3N2+6H2O       (2)

NO+NO2+2NH3 →2N2+3H2O        (3)

Process flow

For a typical SCR process, the SCR reactor is installed between the economizer and the air reheater. The following figure shows the process flow:

SCR process flow

Performance

Denitrification efficiency: 70-95%

Ammonia slip ≤ 3ppm

SO2/SO3 conversion <1%

System pressure drop <800 pa

System utilization >98%

Jiangnan Environmental Technology, Inc.

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