Capture of CO2 from solid fuels using Chemical-Looping Combustion and Chemical-Looping Oxygen Uncoupling

摘要: In order to meet the global demand of CO2 neutral energy, chemical-looping combustion could play an important role. Oxygen can be transferred from air fuel by means oxygen carrying metal oxide particles circulating between two reactors, air- and a reactor. This enables without mixing products combustion, H2O with nitrogen air. In this thesis main strategies for using solid fuels oxygen-carrier material have been investigated. The first is introduction coal directly reactor where gasification subsequent reactions will occur simultaneously. second use carrier which releases O2 in gas-phase oxidized through normal combustion. last alternative referred as uncoupling (CLOU). results give proof concept both investigated options. A small lab designed tests has developed, experimental procedure testing established. involves cyclic oxidation containing gas reduction fuel. Also larger screening was made different ores industrial materials identifying number possible low-cost materials. The rate char limiting reaction, reaction CO H2 found quite rapid. presence enhances rates significantly, most likely because removal CO. conversion dependent on fraction steam SO2 fluidizing gas, well temperature volatiles A preliminary estimation inventory needed real CLC-system suggested that it would 200 2000 kg/MWth depending used. The are much higher CLOU compared CLC increased significantly increasing temperature. No measured experiment petroleum coke carriers take place at low concentrations close equilibrium partial pressure.