含硫烟气生产二甲基硫醚流程模拟及优化

Simulation and optimization of production of dimethyl sulfide from SO_2 flue gas

工业废气中的SO_2是导致雾霾问题的一个重要因素。文章通过大量工艺论证提出了含硫烟气生产高附加值二甲基硫醚的工艺流程及工艺条件,工艺流程包含硫磺工段、硫化氢工段、二甲基硫醚工段。各工段反应转化率均能达到90%以上,反应副产物少,分离过程较简单。最后运用Aspen Plus软件对整个流程进行模拟,分别应用了Rstoic模块、Radfrac模块、flash 2模块等。在二甲基硫醚工段,通过对各塔进料位置、回流比、理论板数等操作参数的优化,确定最佳工艺条件。模拟结果表明:二甲基硫醚年产量为1.2万t,纯度为99.02%,具有良好的经济效益与环境效益,可为含硫烟气资源化处理生产提供理论指导。

SO2 in flue gas is an important factor causing fog and haze problem.So it is urgent to treat waste gas resource fulization.This paper put forward the process of dimethyl sulfide which had high added value from SO2 in flue gas.The process included three sections:sulfur section,hydrogen sulfide section,dimethyl sulfide section.The conversion rate of each reaction can reach more than 90%.The separation process is simple with few reaction by-products,simulated by Rstoic,Radfrac and flash 2 blocks,etc of Aspen Plus.In the dimethyl sulfide section,the operation parameters such as the feed temperature,the reflux ratio and the theoretical plate number have been optimized by using sensibility block to determine the best process conditions.The simulation results show that the annual production of dimethyl sulfide is 12000 t with the purity of 99.02%,it has good economic benefit and nice environmental benefit,and it can provide some advice for the disposal of SO2 in flue gas resource fulization.