A Techno Assessment of Different Solvent- based Capture Technologies Within an IGCC-CCS Power-station

Context The CO2CRC is involved in research, development and demonstration of a number of different methods for the large scale capture of carbon dioxide. The Engineering Development Group within the CO2CRC is involved with assessing and optimization the process designs associated with the capture of CO2. The Engineering Development Group recently assessed a number of capture methods for air blown gasification of brown coal. Objectives The aim of the project is to assess three different solvent absorption methods for the capture of CO2 from a shifted synthesis gas stream prior to combustion in a gas turbine. The project will build on the framework already developed by Urech for an IGCC powerstation based on black coal. The mass and energy balances will be developed in greater detail with emphasis on the water gas shift reactor and the solvent capture processes. The three solvent capture processes will be: Selexol (glycol-based physical absorbent) generally employed for IGCC 1. MEA (solvent used by Urech in his preliminary study – may be change to MDEA) 2. UNO Mk1 Potassium carbonate solvent 3. The UNO solvent is an ionic liquid and can operate at much higher temperatures without degradation and thus does not necessarily require the condensation of the H 2 O fraction from the synthesis gas. It therefore can be positioned between shift reactors, if a high conversion of H 2 is required. The CO2CRC economic parameters will be used for the economic assessment. The economic parameters used for optimization will be the Levelised Cost of Electricity and the Cost of CO2 avoided compared to a no capture reference case. The main project steps are:-Development and preliminary optimization of Selexol CO2 removal-Development and preliminary optimization of amine CO2 removal-Development and preliminary optimization of UNO (post shift) CO2 removal-Investigation of UNO (between the WGS reactors) for CO2 removal Leni Projects-Print