Development of a process for CO2 capture from gas turbines using a sorption enhanced water gas shift reactor system

Abstract

This chapter evaluates the performance of the K2CO3/I-ITC adsorbent (HTC) in the process test unit. The temperature dependence of the CO2 capacities is characterized by a 10kcal/mole heat of adsorption. The CO2 adsorption and desorption processes were evaluated in a fixed bed system and the data were used as basis for sorption enhanced water gas shift (SEWGS) process designs. The SEWGS concept was demonstrated with a vessel packed with hydrotalcite (HTC) and temperature shift reactor (HTS) catalyst. With no adsorbent, CO and CO2 breakthrough once the void gases are displaced. When adsorbent is added, the CO2 breakthrough is delayed, and the removal of CO2 drives the CO to insignificant levels. Decarbonized product gas containing feed He and N2 and additional H2 formed via the reaction is produced at reaction pressure and temperature. A cyclic experiment was conducted which demonstrated that a stable product gas can be formed with 5 times less CO+CO2 than in the feed. Power generation process designs have been generated for the CCP Norcap scenario utilizing SEWGS fuel gas decarbonization. The SEWGS processes use hydrotalcite as a high temperature CO2 adsorbent. Economic evaluations indicate that this approach has potential for clean power production with CO2 recovery for sequestration.