Improvements in integrated drying gasification

摘要

An integrated drying gasification system comprises a gasifier for gasifying carbonaceous fuel to produce hot product gas and an entrained flow dryer which receives the hot product gas to dry the carbonaceous fuel prior to gasification. At least one inlet to the gasifier communicates one or more additional gases from the system, such as recycled syngas, steam and/or recycled carbon dioxide, to the gasifier to generate an increased hot product gas mass flow rate from the gasifier. The system may comprise a plurality of lock hopper systems coupled to the entrained flow dryer. At least one intermediate storage vessel may be provided in one or more feed legs to the gasifier maintain a constant supply of carbonaceous fuel to the gasifier for a temporary period independently of carbonaceous fuel supplied to the entrained flow dryer.