The hot lean amine existing the amine regenerator flows into the lean side of lean/rich amine exchangers by means of heat lean amine pumps where heat is exchange with the cold rich amine from the flash drum. The cooler lean amine is further cooled to 45 degC in the lean amine air cooler. This is an air cooler utilizing stadard finned tubes and electric motor driven fans. Air cooler is equipped with bug screens and eazh bank includes one variable frequency drive (VFD) fan motor to assist in achieving close temperature control of the lean amine.
The cooled lean amine from the lean amine cooler flows to the amine surge vessel. The vessel size is sufficient for 5 minutes holding time between HLL and LLL to ensure lean amine pumping capability to the contactor.
The lean amine pumps are electric motor driven multistage centrifugal pumps that deliver the high pressure needed for the solvent to enter the amine contactor. the pump outlet pressure must be sufficient to overcome the contactor operating pressure while delivering the required amine circulation rate.
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