doi:10.16186/j.cnki.1673-9787.2020070012

Received:2020/07/06

Revised:2020/09/28

Published:2022/03/15

Study on optimization of NH₃/NO_x molar ratio in the whole area of SCＲ denitrification system

TAN Zengqiang1,2, YAO Hao1, ZHOU Mengwei1, ZHANG Anchao3, NIU Guoping1, YAO Wei2, PAN Dong2

1.Huaneng Yangtze Environmental Technology Co. ， Ltd. ， Beijing  100031 ， China；2.Xi'an Thermal Power Research Institute， Xi'an，  710054 ， Shaanxi， China；3.School of Mechanical and Power Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract: In order to instruct the optimization and adjustment of ammonia injection，the grid-method field test was carried out for SCＲ denitrification device of a pulverized coal boiler． The measured non-uniform NO_x mass concentration field and operation parameters were taken as the input conditions of CFD simulation，and the calculated outlet parameters were compared with the measured values． It was found that the poor uniformity of NO_x distribution at the outlet of denitrification reactor on side A and side B，and the local ammonia escape was obvious． The distribution of NO_x mass concentration at outlet under different ammonia injection strategies was compared，and the optimal ammonia injection strategy was finally obtained． The ammonia injection valve optimization was carried out without boiler shutdown． After optimization，the ammonia escape at the denitration outlet was reduced to a reasonable level，and the resistance of air preheater was reduced to the normal range，which improved the operation safety and economy of the unit．

Key words:SCR;denitrification;ammonia escape;flow field

 SCR脱硝全区域NH_3_NO_x等摩尔比优化研究_谭增强.pdf