660 MW燃煤电厂SNCR脱硝数值模拟
程智海，时光辉，赵玉伟，刘海龙
（上海电力大学能源与机械工程学院，上海 200090）
摘要： 研究选择性非催化还原脱硝法（SNCR） 在大型燃煤电厂运行的影响因素，使用计算流体力学软件CFD 模拟炉
内喷入以尿素为还原剂的脱硝过程。模拟结果发现，当锅炉处于满负荷运行时，炉膛顶部满足SCNR 脱硝温度窗口的高
度为57 m以上，因此使用三区、五区、六区的尿素溶液喷枪。随着氨氮比的增加，在脱硝率从25.9%增大到32.2%的同
时，烟道出口NH₃泄漏量从5 μmol/mol增加到46 μmol/mol。氨氮比1.0∶1.5 为最理想的脱硝效果，脱硝率为29.3%，烟
道出口NH₃泄漏量为11.2 μmol/mol。
关键词： 选择性非催化还原；数值模拟；尿素溶液；烟气脱硝
中图分类号： X511     文献标识码： A     文章编号： 2095-0802-(2020)05-0066-04
Numerical Simulation of SNCR Denitration in 660 MW Coal-fired Power Plant
CHENG Zhihai, SHI Guanghui, ZHAO Yuwei, LIU Hailong
(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
Abstract: This paper studied the influencing factors of selective non-catalytic reduction denitration(SNCR) operation in large coalfired
power plant, and used CFD software to simulate the denitrification process in which urea was injected into the furnace as
reducing agent. The calculation results showed that when the unit was running at full load, the height of the top of the furnace to
meet the SCNR denitration temperature window was more than 57 m, therefore, three, five, and six zone urea solution spray guns
were used. With the increase of ammonia-nitrogen ratio, the denitration rate increased from 25.9% to 32.2%, the amount of ammonia
leakage at the flue outlet increased from 5 μmol/mol to 46 μmol/mol. The ammonia-nitrogen ratio was 1.0-1.5, which was the
best denitrification effect. The denitrification rate was 29.3%, and the leakage of ammonia at the flue outlet was 11.2 μmol/mol.

Key words: selective non-catalytic reduction; numerical simulation; urea solution; flue gas denitrification