Numerical Optimization of the Collision Humidification Processin the Multifluid Alkaline Spray Generator for a 75t/h Incinerator Flue Gas Cleaning System
Three-dimensional computational fluid dynamics mathematical model is used to simulate gas-droplet-particle multiphase flow and the collision humidification between droplets and sorbent particles in a multifluid alkaline spray generator for a 75t/h incinerator flue gas cleaning system. In this model, the motions of discrete phases are tracked simultaneously by stochastic trajectory approach, and a probability model of droplets catching particles is presented to judge whether the particles are caught or not. The main structure and operation parameters are optimized to give valuable reference to the design and operation of the FGD process. The results show that to decrease flue gas flow rate can improve the collision humidification efficiency between droplets and sorbent particles but it maybe result in the recirculation flow. The humidification efficiency can reach 78.5％ and there is no recirculation zone in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. There is an optimal droplet diameter ranged from 125μm to 150μm corresponding to maximum humidification efficiency in this paper. The optimal particle injection location is the internal annular of the entrance cross-section near to the spray jet.
Numerical optimization Semidry flue gas desulfurization Multiphase flow Droplet-particle collision Humidification activation Direct simulation Monte Carlo
Yuegui Zhou Mingchuan Zhang Weicheng Cao Lei Wang
Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiaotong Univers Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiaotong Univers
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）