CO-COMBUSTION IN AN OXYFUEL POWER PLANT WITH SYNTHESIS GAS PRODUCTION

Övrigt konferensbidrag, 2007

This paper investigates new possibilities and synergy effects for co-firing of biomass and coal in an energy system with carbon capture. A new way to make the oxyfuel process more effective through a sub stoichiometric combustion is enabled due to the co-combustion of biomass in the process, which keeps the process CO2 neutral. The sub stoichiometric combustion leads to a production of synthesis gas in the process, which is converted to DME in an integrated process. An available study on an oxyfuel power plant is combined with a process for DME production in a computer model to simulate the suggested process. The degree of sub stoichiometric combustion, or amount of synthesis gas produced, is optimized with respect to the overall efficiency. The maximal efficiency were found at a stoichiometric ratio of 0.6 were the efficiency for the electricity producing oxyfuel process is 0.35 and the efficiency for the DME process is 0.65. The results show how biomass can improve carbon capture processes and on a possibility for an expansion and an efficient use of biomass.