GASIFYING PROCESS USING SUPERHEATED STEAM

摘要

Waste material is incinerated to heat water to produce low-temperature steam (12). The steam is mixed with oxygen (14) to produce synthetic air. Methane (22) (first fuel) is burnt in the synthetic air to produce ultra-superheated steam at about 1600 DEG C. Coal particles (24) are gasified in the ultra-superheated steam producing a second fuel, which is combusted in hot air. The products of combustion are expanded isothermally in a turbine (T1) to produce electricity (50). The hot waste gas from the turbine is used to heat air (52) isothermally compressed in a compressor (C1) in the presence of a water spray (56). The heated air supports the combustion of the gasified coal and the cooled waste product is employed for district heating purposes.