METHOD FOR DISCHARGE GAS DENITRATION

摘要

In order to provide a method for flue gas denitrification, which can suppress the deterioration of a denitrification catalyst which is used in treatment for a combustion flue gas of biomass, and decreases the frequency of the replacement of the catalyst, the method includes: blowing ammonia or urea as a reducing agent into the flue gas that is formed by a mono-fuel combustion of biomass or a multi-fuel combustion of a biomass fuel and coal; bringing the flue gas into contact with the denitrification catalyst that contains titanium oxide as a main component; and reducing and removing nitrogen oxide contained in the flue gas, wherein sulfuric acid or SO 3 gas is injected into the flue gas which flows upstream of the denitrification catalyst.