METHOD FOR RECOVERING GAS IN TREATMENT OF BIOMASS IN CDQ

PROBLEM TO BE SOLVED: To provide a method for recovering a combustible gas which is useable for other application as a fuel replacing petroleum or LNG and a chemical raw material without utilization by combustion of a combustible gas which can carry out only low-efficiency heat recovery when thermally decomposing biomass such as wood or sewage sludge cake and effectively utilizing the combustible gas produced by the thermal decomposition in CDQ (a coke dry quencher). SOLUTION: The method for recovering the gas in treatment of biomass in CDQ comprises introducing air for partial combustion for burning a part of the combustible gas produced by thermal decomposition of biomass into a pre-chamber 4 in order to keep the temperature of the pre-chamber to a temperature suitable for thermal decomposition of biomass, when charging biomass such as wood or sewage sludge cake into the pre-chamber 4 in the upper part of a cooling chamber 5 in CDQ and carrying out thermal decomposition of the biomass by utilizing sensible heat of red heat coke 1 and using the combustible gas produced by thermal decomposition as a cooling gas and recovering excess combustible gas as a fuel gas. COPYRIGHT: (C)2004,JPO&NCIPI