SCR denitration catalyst under low temperature conditions is short service life and easy poisoning

in order to achieve stable and up to standard SCR denitration effect under low temperature conditions and prolong the service life of low temperature denitration catalyst. A series of vanadium and titanium catalysts used in low-temperature SCR denitrification at a coking plant in Tangshan were tested by X-ray fluorescence spectrum.The results showed that the main toxic substance on the surface of SCR catalyst was ammonium bisulfate with a content of 2.8%（thermogravimetric method）. In addition

there was a small amount of toxic substance CaO on the surface with a content of about 0.769%. Based on the practical engineering experience

the on-line regeneration of catalyst is suggested to install a burner heating device on the flue gas pipe at the inlet of denitration reactor to decompose ammonium bisulfate on the catalyst surface at high temperature regularly

so as to regenerate the catalyst on line and prolong the service life of the catalyst.