Solvent Management in Post Combustion CO2 Capture

Topic: Towards better solvent management in Post Combustion CO2 Capture plant by understanding solvent degradation, corrosion and emissions from pilot plant tests.


Recently, it has become evident that the rise in global temperatures is associated with an increase in anthropogenic CO2 emissions. In the last decade, significant research efforts have been directed towards developing options to capture CO2 from large point emitters. Post Combustion CO2 Capture (PCCC) is one of the preferred routes to capture CO2 from flue gases of power plants. Solvent, typically amines, forms the heart of the process and the overall sustainability and performance for the removal of CO2 depends on it. Thus, solvent management forms a key aspect of a CO2 capture plant.

Solvent management concerns with solvent degradation, corrosion and emissions. Solvent degradation concerns with oxidative and thermal degradation as a result of components such as O2, NOx, SOx, fly ash, etc. These compounds can be aggressive to the material of construction such as stainless steel and lead to corrosion causing leaching of metal elements such as Fe, Cr, Ni, Mn, etc. This is an autocatalytic process and must be checked from time to time. Emissions of amines and ammonia, which is a major degradation product, needs to be addressed not only to meet environmental permits but also, to minimize operating costs. Recently, the issue of aerosol based emissions has become a major point of attention. Aerosol based emissions contribute significantly to total emissions. Moreover, no cost-effective countermeasure is available yet, for reducing aerosol based emissions. The objective of this work is to address these issues by learning from the various pilot plant tests conducted at several locations.