Numerical Simulation and Inflow Optimal Design of 7 500 t/d Cement Kiln Tail SCR Denitrification Reactor
In order to address the issues of significant catalyst deterioration,inadequate denitrification effectiveness and ammonia leakage exceeding 3 mg/kg in the SCR denitrification reactor of the kiln end flue gas of a 7 500 t/d cement clinker production line in a cement plant in Shanxi,this paper employed the Gambit software to construct a 1∶1 scale model of the denitrification reactor.The Fluent software was used to simulate the characteristics of the flow field distribution in the flue of the full-size SCR reactor,and an optimal scheme was proposed,which involved adding and adjusting two plates-a homogeneous plate to guide uniform flow and a deflector plate to guide diffusion flow-to the original design.This optimized scheme was then verified through engineering tests and was found to meet the industrial performance indexes.The relative standard deviation of the velocity distribution upstream of the first layer catalyst was optimized from 51.43%to 14.92%,while the average flue gas incidence angle upstream optimized from 20.17° to 9.85°,which had a lesser effect on the pressure loss of the system,thereby reducing the cost of denitrification of the flue gas from the tail end of the cement kiln and enhancing the efficiency of the flue gas denitrification.
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