The New Arrangement Form And Effect Of The SCR Reactor Of Heat Recovery Steam Generator

The practical application of domestic power plants SCR (Selective Catalytic Reduction) technology flue gas denitrification process, often in low load SCR reactor inlet flue gas temperature is lower than the SCR catalyst optimum reaction temperature window, even when serious reaction temperature is lower than normal and other issues, leading to the SCR reactor operating efficiency is significantly lower, seriously affecting the efficiency of waste heat boiler denitration, NOx emission concentration and ammonia slip rate. Therefore, without affecting the overall operation of the waste heat boiler, the SCR effectively improve the reaction efficiency, to maintain a high activity of the SCR catalyst, it is necessary to ensure that the original SCR reactor system highly efficient and stable operation.This article provides an overview of the system of selective catalytic reduction SCR reaction mechanism and the various systems of the SCR article. Using CFD simulation software to simulate the actual flow field, numerical simulation method introduced SCR system used by the foundation as well as its control equation, and k-ε turbulence model used in this paper as well as the calculation of the porous medium model Introduction.Through comparative analysis of thermodynamic calculation and analysis of the changes under high pressure and high pressure evaporator, superheater two different thermodynamic parameters of the main program and in accordance with the actual situation of the project to establish a SCR DeNOx reactor model diagram, analyze the summer operating conditions,50% load conditions under each smoke parameters, SCR denitration about setting reactor flow simulation time are described. Describes the evaluation of the effect of SCR denitration reactor two indicators, namely, the uniformity of flow field and temperature field uniformity index.In numerical simulation based on the different angles at high temperature flue gas bypass, the different simulation analysis of flue gas injection velocity, through the temperature field contour plot of a plan view of the SCR reactor drawn from the analysis, at different angles high temperature flue gas bypass, select two representative cross-sectional temperature distribution deviation and velocity deviation distribution analysis, the jet velocity bypass within 1.0～3.0m/s range, when the incident angle is 20°, AIG segment and temperature and velocity distribution in the catalyst layer are in a good range, to provide a reference for high temperature bypass design.