Considering the influence of internal and external diffusion and the adsorption of ammonia

the Fluent software was applied to establish the three dimensional model for single channel catalyst during selective catalytic reduction denitration process.On the basis of the E-R reaction kinetics

the effects of operation parameters and catalyst layer thickness on the denitration efficiency and SO_2 conversion rate were investigated.The simulation results show that

the denitration reaction has a wide operating temperature window which ranges from 553 Kto 653K.At temperature above 653 K

with the aggravation of the side effects

the denitration efficiency decreased significantly.Along the flow gas flowing direction in the catalyst

the reaction temperature rises slightly

but the exothermic phenomenon is not obvious.With an increase in mole ratio of NH_3 to NO

the denitration efficiency and ammonia escape rate increased while the conversion rate of SO_2 decreased.High space velocity can reduce both the denitration efficiency and the SO_2 conversion rate.In addition

the SO_2 conversion rate increases linearly with wall thickness of the catalyst.Due to the limitation of inner diffusion

the denitration efficiency drops significantly with the increasing catalyst wall thickness.