电厂尾气选择性催化还原脱硝反应器数值模拟及优化设计
Numerical simulation and optimization of selective catalytic reduction denitration reactor for tail gas in power plants
摘要：
采用Fluent 14.0对某电厂300 MW燃煤机组选择性催化还原（SCR）烟气脱硝反应器内的流场进行了数值模拟，对导流板和整流格栅进行了优化设计，对比分析了不同导流板设计方案下第1层催化剂上方烟气速度相对标准偏差、入射催化剂角度及氨氮物质的量之比。结果表明，采用最优设计方案时，反应器内第1层催化剂上方烟气速度分布均匀，相对标准偏差为12.4%，入射催化剂角度最大为10°，氨氮物质的量之比的相对标准偏差为1.8%，温度分布最大绝对偏差为1.44 ℃，从脱硝装置入口到出口之间系统总压力损失为327.85 Pa（不考虑催化剂阻力）。
Abstract：
Numerically simulates flue gas flow in the selective catalytic reduction (SCR) denitration reactor of a 300 MW coal-fired power plant. Obtains the optimum scheme of guide plates and ammonia injection grid (AIG). Compares and analyses the relative standard deviation of flue gas velocity, incidence angle and molar ratio of ammonia to nitrogen above the first catalyst layer in different design schemes of guide plates. The results show that with the optimum design scheme, the velocity distribution is uniform with a relative standard deviation of 12.4%, the maximum incidence angle is 10°, the relative standard deviation of molar ratio of ammonia to nitrogen is 1.8%, and the absolute deviation of temperature distribution is 1.44 ℃ above the first catalyst layer. The total pressure loss between the inlet and outlet of the reactor is 327.85 Pa.
Keywords:selective catalytic reduction, power plant, flue gas, nitrogen oxide, denitrification reactor, guide plate, ammonia injection grid, numerical simulation