ABSTRACT
The feasibility of using solid fuel (petroleum coke) in chemical-looping combustion (CLC) has been investigated. A laboratory fluidized-bed reactor system for solid fuel, simulating a CLC-system by exposing oxygen-carrying particles to alternating reducing and oxidizing conditions, has been developed. In each reducing phase 0.2 g of petroleum coke was added to the reactor containing 20 g of 60% active material of Fe₂O₃ and 40% MgAl₂O₄. Effect of steam and SO₂ content in the fluidizing gas of the reactor was investigated as well as effect of temperature. A high dependency on steam and SO₂ content in the fluidizing gas as well as temperature was shown. Also shown was that the presence of a metal oxide enhances the gasification of petroleum coke. The amount of oxygen carrying particles needed in the fuel reactor is uncertain, but a preliminary estimation suggest that it would be below 2000 kg/MWth which would appear both technically and economically feasible.