循环流化床锅炉SNCR脱硝模拟优化研究

Simulation and Optimization of SNCR Denitration in Circulating Fluidized Bed Boiler

为优化循环流化床(CFB)锅炉选择性非催化还原(SNCR)脱硝的性能,本文采用CFD流体计算软件,对某电厂300MWCFB锅炉SNCR脱硝过程中的烟气流动、液滴雾化蒸发、NH3-烟气的混合、烟气-颗粒多相耦合等进行了模拟优化研究。结果表明,SNCR脱硝系统的三台旋风分离器入口风量基本一致,分离器内温度与颗粒浓度分布正常,通过改动喷枪的位置及喷枪的相对间距,能够明显改善分离器内NH3与烟气混合的均匀性,省煤器后烟气速度分布与氨浓度分布均匀。研究结论为SNCR脱硝系统的优化改造提供了参考。

To optimize the performance of selective non-catalytic reduction(SNCR) denitration of circulating fluidized bed(CFB) boilers, in this paper, CFD fluid calculation software is used to simulate and optimize the flue gas flow, droplets atomization and evaporation, NH3-flue gas mixing, flue gas-particle multip hase couplingduringthe SNCR denitration process of a 300MW CFB Boiler in a power plant.The results show that the inlet flue gas flow of the three cyclone separators of the SNCR denitration system is basically the same, and the temperature and particle concentration distribution in the separator are normal. By changing the position and the relative spacing of the spray guns, the uniformity of NH3and flue gas mixing in the separator can be significantly improved, and the flue gas velocity distribution and NH3concentration distribution behind the economizer are uniform. The research conclusions provide the reference for the optimization of SNCR denitration system.