低温甲醇洗富硫气深冷回收硫化氢工艺  

Cryogenic recovery of H_2S from sulfur-rich gas in rectisol process

作　　者：郝传松 张述伟[1] 李燕[1] 管凤宝 HAO Chuan-song;ZHANG Shu-wei;LI Yah;GUAN Feng-bao(Faculty of Chemical,Environmental and Biological Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工与环境生命学部,辽宁大连116024

出　　处：《现代化工》2018年第7期199-203,共5页Modern Chemical Industry

基　　金：国家自然科学基金项目(81530100)

摘　　要：开发了一种与低温甲醇洗联产、采用热耦合精馏塔深冷精馏回收浓度99.9%以上的H_2S产品气的工艺,其回收率达到77%以上。该流程采用Aspen Plus模拟软件进行设计,使用增压透平膨胀机制冷并回收部分能量。以原料气处理量200 kmol/h为例,详细分析了膨胀端分配率对产品流量和浓度的影响、塔内组分分布状况和产品单耗。最终确定膨胀端的分配率为0.35时,浓度满足要求,回收率较高,硫化氢单耗为211.61 k Wh/t。A new process co-produced with rectisol process is developed to obtain 99. 9% H2S gas through cryogenic distillation in a thermocoupling distillation column.The recovery rate can exceed 77%.This process is designed by using Aspen Plus software and it uses booster expansion turbine to refrigerate and recover part of energy.In case of a200 kmol·h^-1 raw gas handling capacity,the influence of distribution ratio at expansion-end on flow and concentration of product,the components distribution in column and unit consumption per product are analyzed in detail. Eventually,it is determined that the recovery concentration of H2S can meet requirement with a high recovery rate and the unit energy consumption is 211. 61 k Wh per ton of H2S when the distribution rate at expansion-end is 0. 35.

关 键 词：硫化氢回收 热耦合精馏塔 低温甲醇洗 

分 类 号：TQ546.5[化学工程—煤化学工程] TQ125.12