After the flue gas passes through the SCR reactor, NOx reacts with ammonia on the surface of the catalyst to form N2 and H2O, which will not pollute the atmosphere and achieve the effect of denitrification. The reactor of the system has high removal efficiency (up to 90%), reliable operation and easy maintenance.

At present, limestone-gypsum wet flue gas desulfurization process is the most widely used in flue gas desulfurization. The process system is mainly composed of flue gas system, absorption and oxidation system, slurry preparation system, gypsum dehydration system and discharge system. This process is the most mature and stable desulphurization technology at present, and the desulfurization rate is more than 95%.