SUPERCRITICAL WATER GASIFICATION SYSTEM AND GASIFICATION METHOD

摘要

The present invention comprises: a gasification reactor 141 which subjects a slurry body generated from a feedstock comprising biomass to a gasification process using supercritical water; and a heat exchanger 130 which preheats the slurry body before the slurry body is subjected to the gasification process using supercritical water by the gasification reactor 141. The present invention is provided with a supercritical pressure boiler 140 (180) which discharges steam at a pressure which is equal to or greater than the pressure in a supercritical water gasification system. The heat exchanger 130 uses the steam discharged from the supercritical pressure boiler 140 (180) to preheat the slurry body. Consequently, preheating the slurry body that includes water-containing biomass with the heat exchanger 130 using high pressure steam equal to or greater than the pressure in the supercritical water gasification system allows the heat exchanger 130 to be small, reduces generation of tar and char so that clogging of tubes of the heat exchanger 130 is avoided, and allows efficient generation of fuel gas such as methane or hydrogen from the water-containing biomass.