Please use this identifier to cite or link to this item: http://hdl.handle.net/1946/7055
n the following work, the different capture concepts of carbon dioxide from an IGFC power plant have been considered and analyzed. The main objective was to compare the net power output according to the different tail-gas processing concepts (oxy-combustion, H2- and O2-conducting membranes) and to compare the difference of output when CO2 is vented.
The first concept considered is an IGFC plant (integrated gasification gas combined cycle plant with a fuel cell) with oxy-combustion for oxidizing the remaining fuel in the anode tail-gas. The second and third concepts are H2-conducting membranes, one with N2 and the other with air as sweep gas. The fourth concept involves an O2-conducting membrane in which O2 permeates from the cathode side to the anode side without mixing the two streams with each other. Also a fifth concept was developed, where the anode and cathode flows are mixed and no CO2 capture takes place. In the presented dissertation, a model with zero- and one-dimensional (membrane model) computational parts was created to simulate and evaluate the capability of the IGFC plant using different means to capture carbon dioxide.
The efficiency and net power of the different tail-gas concepts were compared, assuming an IGFC plant with oxy-combustion for carbon dioxide capture as the baseline. The capture of carbon dioxide proved to have an efficiency and probably an investment cost penalty. A Carbon Tax (adopted in some countries like Sweden) proportional to the number of kilograms of carbon dioxide released in the environment is necessary to make the carbon dioxide capture economically feasible.