为解决顺北油气田某天然气乙烷回收装置的液化石油气产品含硫量超标问题,利用HYSYS软件建模分析了该装置当前工况下的硫分布及产品质量情况,并探讨了低温分离器温度、脱甲烷塔底温度、脱乙烷塔底温度和液化气塔底温度等关键参数对硫分布的影响规律。结果表明,原料气中的绝大部分有机硫向液化气塔中富集导致了液化气含硫量超标,通过调整参数也始终不能满足规范要求。通过对比常见的液化气脱硫工艺,推荐该油田在乙烷回收装置末端加设纤维液膜脱硫工艺脱除液化气中的超标硫化物,以达到产品规范要求。

In order to solve the problem that the content of sulfur in liquefied petroleum gas (LPG) product from a unit for recovering ethane from natural gas at Shunbei Oil & Gas Field exceeds the standard,the sulfur distribution and product quality of the unit under current working conditions are analyzed by using HYSYS software.The influences of the temperature of low-temperature separator,the temperature at the bottom of demethanizer,the temperature at the bottom of deethanizer and the temperature at the bottom of LPG tower on the sulfur distribution are analyzed.The results show that most of organic sulfur in the feed gas is enriched in the LPG tower,resulting in that the content of sulfur in LPG exceeds the standard,which cannot be solved even if adjusting the parameters.By comparing the common LPG desulfurization processes,it is recommended to add a fiber liquid membrane desulfurization process at the end of the ethane recovery unit to remove the sulfides in LPG to meet the specification requirements.

徐梦瑶(1991-),男,硕士,助理研究员,研究方向为油气田地面工程,xumengy123.xbsj@sinopec.com