Application of a circulating fluidized-bed process for the chemical looping combustion of solid fuels

Purifying CO₂ in an efficient and energy-saving way is the first and most important stop for its sequestration. Chemical looping combustion (CLC) could achieve this goal when applied to solid fuel in a highly practical way. Thermodynamics analysis showed that using NiO, Cu₂O, CuO, and PbO as oxygen carriers could result in higher ratios of PCO₂/PCO in solid fuel CLC process. An innovative concept was proposed to apply a CFB combined with a moving bed on the CLC of solid fuels. A coal gasification process, which occurs in the moving bed in a loop seal would be combined with a reduction process of metal oxide to achieve direct utilization of solid fuel. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA, 8/22-26/2004).