Boiler denitration can be divided into in furnace denitration and out of furnace denitration. Outside the boiler is SCR denitration technology, which are three relatively mature denitration technologies at present. Boiler denitration is mainly divided into hncr (polymer denitration), SNCR (urea denitration) and SCR (selective catalytic reduction technology).
SCR denitration system can treat nitrogen oxides (NOx) in waste gas and make it meet national or local environmental emission standards. The main application fields are generator unit denitration, distributed energy NOx treatment, gas turbine SCR denitration, biomass combustion medium temperature denitration and industrial waste gas high temperature denitration treatment. It can control the organic waste gas of the farm and denitrify the generator. The application condition is applied in the 180 ° -600 ° range, and the appropriate environmental protection compliance scheme can be selected according to the actual condition and the owner's requirements.
Selective catalytic reduction, with selective catalytic reduction (SCR) and reducing agent urea solution (or ammonia, NH3 · H2O) as the core purification components. This filter unit can selectively reduce nitrogen oxides (NOx) in the tail gas to nitrogen.
SCR reaction is a complex and multi-element catalytic reduction reaction. The main reactions are as follows:
NH3 · H2O → NH3 ↑ +h2o (urea hydrolysis reaction)
No+no2+2nh3 → 2n2 ↑ +3h2o (NOx reduction reaction)
4no+o2+4nh3 → 4n2 ↑ +6h2o (nitric oxide reduction reaction)
2no2+o2+4nh3 → 3N2 ↑ +6h2o (nitrogen dioxide reduction reaction)