Test study of recyclic coal gas pyrolysis semi-tar combustion has been carried out on a 1 MW circulating fluidized bed(CFB) test facility for realizing co-generation of heat

electricity

and gas.Test results show that:the coal gas with middle calorific value(12~14)MJ/m3(standard state) can be produced by the co-generation scheme with recyclic coal gas pyrolysis combustion

but the fuel conversion rate in gasifier is only 30%~40%

and most of fuel having been burnt in the combuster;the temperature in gasifier greatly affects the coal pyrolysis reaction and the operation of combuster;the concentration of H2S and tar content are substantially reduced along with increase of Ca/S molar ratio.