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中高压富气乙烷回收工艺改进及优化

Chemical Engineering of Oil and Gas(2021)

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Abstract
针对RSV(recycle split-vapor process)工艺在进行中高压富气乙烷回收时,存在能耗高、流程热集成度低等问题,基于精馏原理,采用改变气源与多级分离的方法提出RSVF(recycle split vapor with liquid flashing process)工艺.再以乙烷回收率和总压缩功耗为响应值,通过灵敏度分析法选出脱甲烷塔压力、低温分离器温度、外输干气回流比、闪蒸温度作为设计变量,采用基于三水平Box-Behnken的响应面法优化工艺参数,对两个模型进行ANOVA法验证.优化后得到的最佳工艺参数为:脱甲烷塔压力2820 kPa、低温分离器温度-48℃、外输干气回流比14.2%、闪蒸温度-40.6℃.在天然气处理量为500×104 m3/d的情况下,工艺经济效益增加了1551万元/年.
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