改良的DHX工艺在丙烷回收装置中的应用

为回收油气田中的丙烷,以现有专利DHX工艺为基准,提出两种丙烷回收改进工艺,并运用HYSYS对3种工艺进行了模拟和分析。结果表明:3种工艺均能满足丙烷回收率大于98%和脱乙烷塔塔底乙烷/丙烷比值小于等于1.6%的指标要求。专利DHX工艺复杂,采用丙烷冷冻系统,设备投资成本高。改良的DHX工艺Ⅰ和Ⅱ取消了丙烷制冷系统,简化了流程并且降低了设备投资。相对于改良方案Ⅰ,改良的DHX工艺Ⅱ干气出口压缩机的能耗增大47%;即从能耗及操作性角度而言,改良的DHX工艺Ⅰ既优于专利DHX工艺也优于改良的DHX工艺Ⅱ,建议丙烷回收装置采用改良的DHX工艺Ⅰ,可使丙烷高产出又经济低能耗。

APPLICATION OF IMPROVED DHX PROCESSES IN PROPANE RECOVERY UNIT

In order to recover propane from oil and gas fields,two improved propane recovery processes are proposed based on the existing patented DHX process,and the three processes are simulated and analyzed by HYSYS.The results show that all the three processes can meet the requirements of propane recovery rate higher than 98%and ethane to propane ratio at the bottom of deethanizer no higher than 1.6%.The patented DHX process is complex.It uses propane refrigeration system and has high equipment investment cost.The improved DHX processⅠandⅡeliminate the propane refrigeration system,simplify the process flow and reduce the equipment investment.The energy consumption of dry gas outlet compressor in the improved DHX processⅡis 47%higher than that of the improved DHX process I.That is to say,the improved DHX process I is superior to both the patented DHX process and the improved DHX processⅡin terms of energy consumption and operability.Therefore,the improved DHX process I is recommended for propane recovery unit for higher propane yield and lower energy consumption.