摘要
采用Euler-Lagrange方法建立了双循环湿法烟气脱硫塔内气液两相流体动力学模型,并基于双膜理论建立了SO2传质模型。通过相应的用户自定义函数模块将SO2吸收程序嵌入FLUENT软件,对中试双循环湿法烟气脱硫塔进行了模拟计算,模拟结果由对应的中试试验进行了验证。分析了主要运行参数对脱硫效率的影响,讨论了上、下循环回路中的气液膜传质阻力。结果表明:液气比和截面气速增大有利于提高脱硫效率;塔内气液传质过程整体为液膜控制,下循环气液膜阻力比约为0.35,上循环约为0.65。模拟结果同试验数据相比误差在5%以内,说明该数值模拟方法可以用来指导大型双循环塔的优化设计和预测塔内SO2分布及脱硫效率。
A gas-liquid hydrodynamic model was established by the Euler-Lagrange method to simulate a pilot-scale double-loop wet flue-gas desulfurization（ WFGD） reactor. The SO2 absorption mass-transfer model was primarily built on the dual-film theory,and the SO2 absorption procedure was implemented in the commercial softw are FLUENT through a user-defined function（ UDF）. The relationship between main operation parameters and the SO2 removal efficiency was analyzed,and the gas and liquid side mass transfer resistance was also discussed. Results showed that the desulfurization efficiency rised by increasing liquid-to-gas ratios and reduced with the improving of superficial gas velocity. Gas film resistance to liquid film resistance ratio was about 0. 35 in the low er-loop,while 0. 65 in the upper-loop.Studies on the pilot-scale double-loop WFGD tow er showed that the simulated SO2 removal efficiency agreed well with the experimental data,with an error of less than 5%. Therefore,the mathematical model can be used to optimize fullsize double-loop WFGD structures,as well as to predict the SO2 distribution and desulfurization efficiency.
出处
《山东大学学报（工学版）》
CAS
北大核心
2015年第5期88-94,共7页
Journal of Shandong University（Engineering Science）
基金
国家自然科学基金资助项目(51176103)
山东省科技发展计划资助项目(2014GSF117034)
关键词
双循环
湿法烟气脱硫
数值模拟
传质
多相流
double-loop
wet flue gas desulfurization
numerical simulation
mass transfer
multi-phase flow
