Design And Study Of SCR Flue Gas Denitrification And Flow Field System Based On Simulation Of The Thermal Power Plant

The environmental problems caused by the pollution of coal burning are becoming more and more serious.. Among them, nitrogen oxide(NOx) is one of the major air pollutants that has been widely concerned in recent years.. The NOx of about 65% of our country is due to the coal combustion of power plant. It is an urgent task to control the formation and emission of NOx effectively.. Therefore, it is of great significance to actively develop the high-efficiency and low cost denitrification technology to meet the growing environmental protection requirements.The environmental problems caused by the pollution of coal burning are becoming more and more serious.. Among them, nitrogen oxide(NOx) is one of the major air pollutants that has been widely concerned in recent years.. The NOx of about 65% of our country is due to the coal combustion of power plant. It is an urgent task to control the formation and emission of NOx effectively.. Therefore, it is of great significance to actively develop the high-efficiency and low cost denitrification technology to meet the growing environmental protection requirements.The SCR denitrification device has a strict requirement for the inlet gas flow field of the reactor, especially the denitrification efficiency is more than 80%, the distribution of the gas flow field is more stringent.. Engineering design often due to limitations of space on the site and other factors, the SCR reactor and difficult layout of outlet flue, the reactor inlet gas flow distribution deviation is large, resulting in catalyst outlet of NOx and NH3 concentration field is not uniform, part of the NOx content is very low and NH3 escape in large quantity, or parts of the area of the NH3 escape less but higher NOx content, which will affect the system’s overall denitrification effect and to the economic and stable operation of the system bring great harm. For the design of SCR flue gas denitrification, the flow field simulation experiment is necessary to improve the uniformity of the flue gas, improve the denitrification efficiency and reduce the ammonia escape..Build 1:12 physical model test and Taiwan, respectively, completed the SCR denitrification system of fireworks tracer test, pressure loss test, glass bead simulation of fly ash and gas solid two-phase flow test and fly ash deposition characteristics test etc.Finally, through respectively, to complete the 10%BMCR, 75% BMCR and 50% BMCR condition of physical model experiment data and ANSYS numerical simulation results analysis, to finalize the SCR denitrification system of diversion plate arrangement removal is reasonable, and to determine the direction, velocity, pressure loss and temperature refers to the influence factors.The main innovations of the research are as follows:(1) The CFD calculation and cold model experimental results agree very well, for the final determination of the optimized system provides theoretical basis and possible solutions, to ensure that as much as possible to reduce the pressure loss and prevent blockage of ash and SCR device maximum operating efficiency;(2) The structural optimization of selective catalytic reduction(SCR) denitrification device is summarized.. And for SCR reactor simulation test and CFD calculation main existing problems, and puts forward the a of reactant non-uniformity of on de NOx performance, combined with examples presented in this paper provide the part points;(3) By numerical simulation and cold physical model tests confirm each other, to verify the correctness of the mathematical model, through comparison of mathematical model and physical model results, this paper made the optimization arrangement of denitrification reactor flow structure of the thermal power plant SCR denitration.