CO2 capture from natural gas power plants by aqueous PZ/DETA in rotating packed bed

摘要

An rotating packed bed (RPB) was applied to capture CO2 from the flue gases of natural gas power plants containing 4 vol% of CO2 using an aqueous solution with mixed absorbents piperazine (PZ) and diethylenetriamine (DETA) in this study. The experimental results showed that PZ/DETA with 4.0 m/4.0 m, as the most promising formulation, not only exhibited higher CO2 capture efficiency and capacity but also showed lower regenerated energy in an RPB with 54.8% lower than the most common used absorbent of 7.0 m monoethanolamine (MEA). The effects of absorbent concentration, lean loading and regeneration in an RPB were all investigated. Based on the Aspen Plus simulation to 7.0 m MEA with various loadings, a packed bed (PB) required 4.6 times the volume of an RPB to achieve the same capture efficiency at the same operating conditions; the CO2 capture efficiency and amount using an RPB were 63% and 4.6 times higher, respectively, than those for the same volume PB, indicating the superiority of an RPB to treat low CO2 concentration flue gases. (C) 2017 Elsevier B.V. All rights reserved.