Fluidized bed gasification of coal-oil and coal-water-oil slurries by a gas containing CO ₂-oxygen mixture

A study on fluidized bed (FB) gasification of coal-oil slurry (COS) and coal-oil in water (COWS) slurries with gases containing higher concentrations of CO ₂ is put forward. COS with 50 mass % of coal and 50 mass % of rape seed oil proved to be efficient, dense fuel with LHV ≈ 30 MJ/kg. The heating values of dry, N ₂-free producer gas were affected by diluting effect of CO ₂ and by the relatively high content of ethylene, BTX, and tar compounds. FB gasification of the COWS with content of water ≈ 40 mass % and content of oil ≈ 12 mass % reduced tar yield ≈ to 50%, but simultaneously moderately reduced the heating value of the producer gas. The problem with excessive entrainment of unreacted small coal-char particles in FB gasification could be solved by recirculation of coal-char particles. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and 19th International Congress of Chemical and Process Engineering CHISA 2010 (Prague, Czech Republic 8/28/2010-9/1/2010).