Abstract:Take SCR reheat heating type in 200MW ultrahigh pressure steam turbine generator unit as an example, and combined with the problem of unsatisfied of denitration efficiency, unstable ammonia escapement ratio and blocking air preheater, this paper analyzed that the reason is because denitrification system was running away from the design value for a long time and several air preheater was blocking. In the end, this paper put forward countermeasures for above problems and set up the lowest temperature of safe operation to make sure flue gas is homogeneous distribution at the catalyst inlet of the reactor during actual operation. This proposal provides a security, high efficiency and stability guidance for SCR denitrification system.

Keywords:SCR;denitrification system;NOx, emission;ammonia escape