18.石炭の熱分解およびガス化過程における塩素の挙動

抄録

About half amount of the Cl in a sub-bituminous coal is released as HCl in the fixed bed pyrolysis, the rest being retained mostly in the pyrolyzed char. In the CO_2 gasification at 1000℃ and 2.5MPa, HCl can not be detected significantly, and about 90% of the Cl in the char remains unreleased at char conversion of 50%. When the pulverized coal is injected into an O_2-blown, entrained bed gasifier at 1200-1400℃ and 2.6MPa, the partial oxidation of the resulting char proceeds, and conversion of the C in it reaches 95%, whereas the Cl is delayed to be gasified compared with the C and thus enriched in the remaining char even at the latter stage of reaction.