J.-U. Repke

Exergoeconomic Analysis of Post-Combustion CO2 Capture Processes

Abstract One of the instruments against the global warming is capture and sequestration of carbon dioxide from the flue gas of coal-fired power plants. Different concepts of capture are being pursued. The advantage of post-combustion processes, like processes based on absorption and stripping, is the possibility of retrofitting a state-of-the-art power plant with a capture facility under reasonable effort. Capturing CO2 by using an absorption/stripping process requires energy in form of electricity and steam both supplied by the power plant. The capture process thereby reduces the overall efficiency of the power plant by up to 13%-pts. A way to lower these energy requirements is the development of new process configurations. In this study three different configurations were investigated by performing an exergoeconomic analysis. Revealing the major cost sources the processes could be improved by assessing and adjusting the cost effectiveness of each component. Furthermore a new configuration could be derived from the results of the analysis.

Study of a novel heat integrated hybrid pervaporation distillation process: Simulation and experiments

Abstract In the present work a new developed heat integrated hybrid pervaporation distillation process is modeled and experimental studies are carried out to analyze the effect of the heat integration in the process. With the results of the experiments, the model is validated and a comparison between industrial scale non heat integrated and heat integrated processes is done. As a result, three main advantages are presented in the approach: a) reduction of the necessary external energy supply into the process, b) improvement in the pervaporation separation performance and c) reduction in the necessary membrane surface.