METHOD FOR RECOVERING COAL RAPID THERMAL DECOMPOSITION TAR

摘要

PROBLEM TO BE SOLVED: To efficiently recover and effectively utilize tar in a gas formed in rapid thermal decomposition of coal by cooling the tar stepwise with a plurality of cooling apparatuses installed in series to condense the tar and separating and recovering the condensed tar at each cooling apparatus, SOLUTION: After pulverized coal is rapidly heated and thermally decomposed in a thermal decomposition oven, the decomposition product is cooled to 300 deg.C or lower in a heat recovery apparatus and is introduced into a dust- collecting and cooling apparatus 9. A tar-containing gas cooled and freed of dust in the dust-collecting and cooling apparatus is introduced into a tar recovery apparatus, which consists of cooling apparatuses 12-14 installed in series along the gas channel, decanters 16-18 which separate tar from cooling water and are connected to the cooling apparatuses 12-14, respectively, and recovery tanks 24-26 receiving tar recovered at the decanters 16-18, respectively. Therefore, the tar produced is separated at the recovery step into several fractions according to their b.p. levels, and purification processes suitable for their properties can be selected.