Method and installation for gasifying solid fuel

摘要

The invention relates to a method for gasifying solid fuel such as carbon and heavy petroleum residue, comprising of: i) adding dry solid fuel to a gasifying unit; ii) gasifying the solid fuel at high temperature and pressure in the gasifying unit; iii) cooling a gas flow leaving the gasifying unit and containing gasified fuel with a watery slurry of the solid fuel; iv) separating dry solid fuel from the gas flow; and v) feeding back the separated dry solid fuel to the gasifying unit, and to a gasification installation for gasifying solid fuel such as carbon and heavy petroleum residue, comprising: a gasifying unit provided with an inlet for dry solid fuel and a gas flow outlet; a cooling unit connecting onto the gasifying unit for cooling the gas flow with a watery slurry of the solid fuel; a separating unit for separating dry solid fuel from the cooled gas flow; and a feedback unit for feeding back to the gasifying unit the dry solid fuel separated out of the gas flow.