In order to solve the problem that economic loss is caused by high energy consumption and low equipment utilization in medium and high pressure lean gas ethane recovery process,three high-efficiency ethane recovery processes,including recycle split vapor process(RSV),supplemental rectification with compression process(SRC)and cold residue reflux process(CRR),are compared in terms of energy consumption,exergy analysis and economic analysis.SRC is selected as the best process.HYSYS software is employed to simulate calculation while ensuring an ethane recovery rate of over 95%.It is shown by energy consumption analysis that SRC exhibits the lowest energy consumption,which is 10.17%and 2.25%lower than RSV and CRR,respectively.It is verified through exergy analysis that SRC in the main process shows the smallest total exergy loss,which is 63.51%and 11.73%lower than RSV and CRR,respectively.It is found from economic analysis that SRC presents the lowest annual economic cost and the best total annual economic benefit,which is 4.98%and 13.24%higher than RSV and CRR,respectively.
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