Numerical simulation and optimization of selective catalytic reduction denitration reactor for tail gas in power plants

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.