冷凝室喷淋布置对脱硫湿烟气冷凝过程影响的数值模拟

Numerical simulation of effect of spray layout in condensation chamber on condensation process of desulfurized wet flue gas

为获取冷凝室的优化设计参数,基于Fluent软件,采用欧拉-拉格朗日方法,构建三维稳态模型,将优化设计后的冷凝室作为计算对象,充分考虑气液两相之间的动量、质量、能量交换,系统分析冷凝室中喷嘴密度、喷淋层间布置、冷凝室高度对传热传质的影响规律。研究结果表明:在直径为1 m的冷凝室内喷嘴的布置存在最佳密度,每层喷嘴最佳密度为19个/m^2;在其他运行参数及结构参数不变的条件下,两喷淋层错层布置,更有利于热质交换,可使出口烟温再降低0.32 K;综合考虑出口烟温与容积冷凝负荷,冷凝室最佳高度为3.2 m。

In order to obtain the optimal design parameters of the condensing chamber,a three-dimensional steady-state model was built based on Fluent software and Euler-Lagrange method.Taking the optimized condensing chamber as the calculation object,the momentum,mass and energy exchange between gas and liquid were fully considered,and the influence laws of nozzle density,spray layer arrangement and condensing chamber height on heat and mass transfer in the condensing chamber were systematically analyzed.The results show that there is an optimal density of nozzles in a condensing chamber with a diameter of 1 m,and the optimal density of nozzles in each layer is 19 per square meter.Under the condition that other operating parameters and structural parameters are unchanged,the two spray layers are arranged in staggered layers,which is more conducive to heat and mass exchange and can reduce the outlet flue gas temperature by 0.32 K.Considering the outlet flue gas temperature and volumetric condensation load,the optimal height of condensation chamber is 3.2 m.