Numerical Simulation of Multiphase Flow and Collision Humidification in the Multifluid Alkaline Spray Generator for a Novel Semidry Flue Gas Desulfurization System
Numerical Simulation of Multiphase Flow and Collision Humidification in the Multifluid Alkaline Spray Generator for a Novel Semidry Flue Gas Desulfurization System
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DOI：
10.1021/ie071494c
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发表时间：
2008-06
影响因子：
4.2
通讯作者：
Yuegui Zhou;Weiguo Cao;Lei Wang;Mingchuan Zhang
中科院分区：
文献类型：
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作者：
Yuegui Zhou;Weiguo Cao;Lei Wang;Mingchuan Zhang
采用欧拉-拉格朗日混合模型模拟了新型半干法烟气脱硫系统中受限多流体碱性喷雾发生器内的气-液-固多相流及吸收剂颗粒与喷雾液滴的碰撞增湿过程。在该模型中，采用随机轨道法同时跟踪各离散相的运动，并建立了液滴捕获颗粒的概率模型，采用直接模拟Monte Carlo方法判断吸附剂颗粒是否被捕获。由脱硫效率的实测值推导出的脱硫效率实验值验证了数值计算的脱硫效率。优化了烟气流量、喷雾液滴直径、吸附剂颗粒直径和颗粒喷射位置对增湿效率的影响。数值结果表明，在轴向距离为1.67 t时，吸收剂颗粒的碰撞增湿效率显著提高。
A hybrid Eulerian−Lagrangian model was developed to simulate gas−droplet−particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. And the effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 t...