某600 MW对冲燃烧锅炉SCR脱硝系统喷氨优化调整

Optimization and Adjustment for Ammonia Injection in SCR Denitrification System of a 600 MW Opposed Firing Boiler

为解决某600 MW对冲燃烧锅炉选择性催化还原(SCR)脱硝系统喷氨支管阀门调整对负荷适应性不强的问题,提出了一种负荷兼顾调整的策略。结果表明:喷氨支管阀门经过负荷兼顾调整后,脱硝系统两侧出口氮氧化物(NOx)质量浓度相对标准偏差平均值分别下降18.52百分点、25.87百分点,喷氨体积流量平均值分别下降20.7 m^(3)/h、27.0 m^(3)/h,脱硝系统的运行得到明显改善。

To solve the problem that the valve adjustment of the ammonia injection branch pipe can not meet the requirement of fully load operation of the selective catalytic reduction(SCR) denitrification system of a 600 MW opposed firing boiler, an adjustment strategy with load consideration was proposed. Results show that, through adopting the adjustment strategy with load consideration for the ammonia injection branch pipe, for the two sides of the denitrification system, the average values of the relative standard deviation of oxynitride(NOx) mass concentration are decreased by 18.52 percentage points and 25.87 percentage points, while the average values of ammonia injection volumetric flow rate are decreased by 20.7 m^(3)/h and 27.0 m^(3)/h. The operation of denitrification system has been significantly improved.