Under the ultra-low emission of NOxin thermal power plants,controlling the initial emission of boiler outlet pollutants and improving the denitrification efficiency of tail flue selective catalytic reduction(SCR)denitrification technology,while achieving ultra-low emission of NOx,controlling SCR operating costs and safe and stable operation of the system are the key to the current deep denitrification of boilers.Through numerical simulation and field flue transformation test,the existing SCR flue structure is optimized and the distribution uniformity of flue velocity field and NOxconcentration field is corrected.The results show that after the flue reconstruction,the flue velocity field and NOx concentration field are more evenly distributed,and the relative standard deviation of NOxconcentration at the denitrification outlet is only 3.19%,which is conducive to reducing the amount of ammonia used.The average unit consumption of liquid ammonia is reduced by 15.94%.Denitration optimization equipment resistance increases by 95 Pa.The result of the transformation is good,and it provides a reference research and application case for the depth optimization of boiler denitration under the background of ultra-low emission.
关键词
超低排放/数值模拟/脱硝深度优化/选择性催化还原
Key words
Ultra-low emission/Numerical simulation/Optimization of denitration depth/Selective catalytic reduction
维普
万方数据