초록

Carbon dioxide; from a boiler flue gas stream is separated, recycled and utilized for gasification of coal or biomass to increase fuel utilization and to decrease the carbon dioxide emissions into the atmosphere.

대표청구항 ▼

[ What is claimed:] [1.] A process for gasification of coal using carbon dioxide extracted from fossil fueled boiler flue gas; the process which comprises the following steps;a. receiving and conducting a feed of coal fines into a fluidized bed gasifier with sufficient carbon dioxide gas and steam a

[ What is claimed:] [1.] A process for gasification of coal using carbon dioxide extracted from fossil fueled boiler flue gas; the process which comprises the following steps;a. receiving and conducting a feed of coal fines into a fluidized bed gasifier with sufficient carbon dioxide gas and steam at elevated temperature and pressure to effectively dry and gasify the coal;b. conducting the synthesis gas and char flowing from the gasifier into a solids separator/classifier to effectively separate the synthesis gas and classify a relatively lighter char solids from relatively heavier char solids;c. conducting the relatively lighter char solids back to the gasifier;d. conducting the relatively heavier char solids into a steam boiler combustion chamber;e. conducting the synthesis gas stream flowing from the solids separator into a steam generator heat exchanger to effect cooling the synthesis gas and evaporating the water stream to a superheated steam;f. injecting the cooled synthesis gas products flowing from the steam generator heat exchanger into the steam boiler combustion chamber;g. conducting the flue gases flowing from said steam boiler into a condensing heat exchanger to exchange heat energy contained therein and preheat a boiler combustion air stream and a boiler feed water stream;h. conducting the cooled flue gases flowing from the flue gas condensing heat exchanger to a carbon dioxide gas separating plant;i. conducting the carbon dioxide flowing from the gas separating plant into the coal gasifier;j. conducting and injecting the superheated steam flowing from the steam generator heat exchanger into the coal gasifier.