2种不同荒煤气衍生气中酸性气体成分脱除的低温甲醇洗工艺开发

Development of Rectisol process for removing acidic gaseous components from wild coal gas

针对某厂的2种不同衍生气原料气,设计出3套低温甲醇洗工艺流程,流程1为8塔低温甲醇洗方案,最后得到净化产品气中酸性组分H_(2)S摩尔分数降到了0.1×10^(-6)以下,满足净化要求;流程2针对荒煤气衍生气中含有额外的C_(2)~C_(6)杂质尤其是苯杂质的特点而设计,为12塔低温甲醇洗方案,也可满足该厂的净化度要求;为进一步节能降耗,针对流程2又进行了换热网络分析,最终设计了流程3,将整个系统的冷公用工程降低了61.70%,热公用工程降低了61.14%,固定投资降低了37.89%,节省了投资。

Three sets of Rectisol process are designed for two different derived gases as feed gases in a certain plant.Among them,process 1 is an 8-tower Rectisol process designed for the first derivative gas,by which the content of H_(2)S in the purified product gas drops to less than 0.1 ppm,meeting the purification requirements.Process 2 is designed in view of the additional C_(2)-C_(6) impurities in the second wild coal gas derived gas,especially benzene impurities.Process 2 is a 12-tower Rectisol process,which can also meet the purification requirements of the plant.In order to further save energy and reduce consumption,heat exchange network analysis is carried out for process 2.Finally,process 3 is designed,which reduces the cold utilities of the entire system by 61.70%,the heat utilities by 61.14%,and the fixed investment by 37.89%,saving a lot of total investment.