Gasification system for solid fuel

摘要

An object is to suppress energy efficiency reduction due to fuel drying and to effectively utilize steam generated through fuel drying in a gasification system using lignite or 5 another high-moisture solid fuel. A high-moisture solid fuel having a high moisture content is dried upstream from a gasifier. The high-moisture solid fuel after drying is fed to the gasifier to thereby prevent temperature fall in the gasifier. A steam-containing gas evolved through fuel drying is fed to 10 downstream from the gasifier, cools the syngas, and accelerates the shift reaction. Examples of the fuel-drying heat source include steam generated through heat recovery downstream from the shift reactor; plant exhaust heat derived typically from steam used for regenerative heating of a CO 2 15 absorbing liquid in a CO 2 regeneration tower; and CO 2 adiabatically compressed after being recovered from the syngas. CO CD co Co Uj co U') -j C) 0 Q0 C, co --------- ui Ul) to co co co C) C) co C) m ui -Jo 0 C-) 0 CMI) C) Cw) C14 C', C 'C ' U') co cq U-1 cq co to U') cn: cli co cli co U') 0-0