Optimize operating parameters of absorbers/strippers in gas plants
Better recovery definition of C3s and C4s from gas absorber/stripper can lower costs
Several factors affect the recovery of C3s and
C4s in gas recovery refinery type plants, typically
found in delayed cokers, fluid catalytic cracking (FCC) and
other downstream gas processing units. These factors include:
flowrates, stream compositions, pressures, recovery
specifications, solvent temperatures and volume of solvents
required.1,2 Operating efficiency of the
absorber/stripper gas plant section also involves the amount of
lean oil entering the secondary absorber and the volume of
stabilized naphtha recycled back to the primary
absorber.3,4 A sensitivity study was done to
optimize the design of an absorber/stripper gas plant section
to improve recovery of C3s and C4s.
Recovery targets of the evaluation are to be based on balancing
an assumed refinery sour gas streams with
liquefied petroleum gas (LPG) production while controlling both
capital investment and operating costs.
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