DHX工艺在膨胀制冷轻烃回收装置上的应用

Application of DHX process in expansion refrigeration light hydrocarbon recovery unit

江油轻烃厂45×104 m3/d轻烃回收装置是以回收中坝气田须二气藏不含硫天然气中的C_3H_8、C_4H_10、C_5H_12及C_6^+以上轻烃组分为目的的生产装置。2017年以前,江油轻烃厂生产工艺为单级膨胀制冷(ISS)工艺,2017年对装置进行了工艺技术改造,在其原有基础上将工艺流程改为DHX工艺。经技术改造后,江油轻烃厂C_3收率由原来的61.87%提高到83.46%,每天增加液化石油气约3t,年创效益约400万元。

The 450×10 3 m 3/d light hydrocarbon recovery unit of Jiangyou Light Hydrocarbon Plant is designed to recover C 3H 8,C 4H 10,C5H 12 and C+6 light hydrocarbon components in the sulfur-free natural gas of the Zhongba gas field.The production technology was a single-stage expansion refrigeration(ISS)process before the year of 2017.Light hydrocarbon recovery unit was retrofitted and changed to be direct heat exchange(DHX)process based on the original installation in 2017.After technological innovation,the C 3 yield of the light hydrocarbon recovery unit has increased from 61.87%to 83.46%,which is about 3 tons of liquefied petroleum gas per day,and the annual benefit is about 4 Million yuan.