Numerical Simulation And Optimization On SCR Flue Gas DeNOx System For 1000MW Power Plant Boiler

In recent years,the rapid development of China's power industry,promoting the rapid economic growth,but also caused more and more serious environmental pollution,in particular nitrogen oxide emissions are increasing.Selective catalytic reduction(SCR)flue gas denitrification technology has the advantages of high denitrification efficiency,mature and reliable technology.More and more power plants is using the technology.Based on the theory of heat and mass transfer,a numerical simulation software Fluent was used to simulate the SCR flue gas denitration system of a 1000 MW unit boiler.Firstly,the 3D model of the system was established by Gambit software,and the flue gas flow of the SCR system was calculated by Fluent software.The calculation results show that the proper deflector can improve the uniformity of flue gas flow,reduce the flue gas recirculation,and increase the rate of catalytic reduction.In order to improve the control precision of ammonia intake and improve the uniformity of the mixture of ammonia and flue gas,the control structure of the ammonia injection grid was modified to increase the number of valves,thus reducing the control area of single valve.The ammonia and flue gas can mix fully in a reasonable proportion through the rational control of each valve opening to improve the reaction efficiency and reduce the ammonia escape rate.The optimized result of stimulation was applied to a power plant.Through performance test the SCR system performance achieved good results and verifies the rationality of simulation calculation and reconstruction.