Novel amine emissions control methods for CO2 capture based on reducing amine concentration in the scrubbing liquid.

Piperazine (PZ) activated 2-amino-2-methyl-1-propanol (AMP) is a high-performance solvent for CO 2 capture that has undergone long-term pilot test. This study explores its vapor amine emissions characteristics on Aspen Plus. It was found that the steady-state amine concentration in the water wash (WW) is a crucial factor affecting emissions, determined by the amine-to-water ratio obtained from flue gas and feed water. Under optimized conditions, vapor amine emissions were reduced from 1768 mg/Nm3 after the absorber to 1.46 mg/Nm3 after two WW sections. Two novel amine control methods were proposed based on the approach of lowering the amine concentration in the scrubbing liquid. Staged condensation of the stripper gas provides super low amine (0.06 wt%) feed water to the WW, further reducing vapor amine emissions by an order of magnitude. The Cooling Dry Bed (CDB) can achieve amine emission control effects comparable to two WW sections with only 20 % of the theoretically calculated interfacial area. This process has a lower total packing height and does not require liquid collection trays, significantly reducing the construction height and load of the column. [ABSTRACT FROM AUTHOR]