The work investigates the amine scrubbing process for CO2 capture from flue gases of a coal-fired power plant using 30 wt. % MEA as solvent. This capture process provides a promising way to reduce CO2-emissions in the power plant sector.
The results of three MEA pilot plant campaigns at the post-combustion capture plant Heilbronn in the years 2011, 2013 and 2014 show that after relatively short operating times several issues occur: high amounts of degradation products and heavy metals can be found in the solvent. The oxidative solvent degradation dominates due to typical oxygen concentrations of 5 to 6 Vol. % (dry) in the flue gas. In order to maintain the solvent quality on a high level for a long-term, stable and economic capture plant operation solvent regeneration techniques are essential.
The objective of the thesis is to analyse the degradation of MEA under real operating conditions and to investigate suitable solvent regeneration techniques. For this purpose, conventional and bipolar electro-dialysis, reserve osmosis and nanofiltration will be investigated. Based on the findings recommendations for solvent regeneration and the reduction of primary oxidative degradation products are given.