油田集输站轻烃脱硫工艺优化及应用

Optimization and application of light hydrocarbons desulfurization process for oilfield gathering station

油田集输站采用碱洗脱硫方式脱除轻烃中的有机硫及无机硫,产生的碱渣增加了集输站安全环保风险。在对碱洗前后轻烃中单体硫进行详细分析的基础上,提出一种新型油田轻烃脱硫工艺,在满足产品轻烃质量指标要求的同时取消现有碱洗脱硫过程,优化了工艺流程。现场应用情况表明,轻烃中硫化氢和硫醇全部以塔顶不凝气的形式被汽提出去,轻烃中总硫含量由0.035%降低至0.023%,产品蒸气压保持在69.5 k Pa,满足产品轻烃质量指标要求。

An oilfield gathering station adopts the alkali washing desulfurization process to remove organic sulfur and inorganic sulfur from light hydrocarbons to ensure that total sulfur content in light hydrocarbons is less than 0.1%,but the output of alkali slag reaches 8 tons per day,which increases the safety and environmental risks for the station.Based on the data of individual sulfur in light hydrocarbons before and after alkali washing,a new desulfurization process is proposed for oilfield light hydrocarbons,which can meet the quality requirements of light hydrocarbon products and cancel the existing alkali washing desulfurization process.The field application shows that hydrogen sulfide and mercaptan in light hydrocarbons are all taken out by steam in the form of non-condensable gas at the top of the tower,total sulfur content in light hydrocarbons decreases from 0.035%to 0.023%,and the vapor pressure of the product remains at 69.5 k Pa,which meets the requirements for the quality index of light hydrocarbons.