We have a DCU with gas recovery system. The outlet streams are Fuel Gas, LPG and light naphta non treated. Of course, there is a litle loss of LPG in the Fuel Gas. Our loss is less than 3 % of C3+. What is the typical number in other DCU’s ?
Hello. without considering the number of theoretical stages in your gas plant and the pressure/temperature you are running, I can say, best in class is <2% loss of LPG into fuel gas but 3% is more "normal."
Evan. Our target is < 2%, but our “spec” is < 3 %. We are running between 2 a 3 %. What do you meaning 3 % is more “normal”. Less than 2 % require more naphta circulation to the absorber. So, to reach < 2 % is it profitable in terms of energy ?
Yes, to increase recovery you can increase flow, decrease naphtha temperature, increase pressure of the column, or alter the tray efficiency. All may be possible but I can’t say which will be your limit without checking.