CARBON RECYCLING SYSTEM THROUGH METHANATION OF CO2 IN FLUE-GAS IN LNGPOWER-PLANT

A bench scale test at ambient pressure has been performed for carbon r ecycling system using a ferrite process in LNG power plant. The chemic al reaction consists of two steps; (i) adsorptive separation and decom position of CO2 to carbon on oxygen-deficient Ni ferrite and (ii) meth anation of deposited carbon. CO2 decomposition and methanation reactiv ities were much improved when the honeycomb support was used instead o f a packed-bed-type reactor. The overall methanation rate of CO2 in fl ue gas from LNG power plant could achieve 1,000 Nm(3) h(-1) when 12,00 0 kg Ni ferrite loaded on a honeycomb support was used. The present me thanation and carbon recycling system could be extended to other CO2 s ources such as IGCC power plant and depleted natural gas plant. (C) 19 97 Elsevier Science Ltd.