초록 ▼

A method and apparatus for treating wastes by two-stage gasification recovers metals or ash content in the wastes in such a state that they can be recycled, and gases containing carbon monoxide (CO) and hydrogen gas (H.sub.2) for use as synthesis gas for ammonia (NH.sub.3) or production of hydrogen

A method and apparatus for treating wastes by two-stage gasification recovers metals or ash content in the wastes in such a state that they can be recycled, and gases containing carbon monoxide (CO) and hydrogen gas (H.sub.2) for use as synthesis gas for ammonia (NH.sub.3) or production of hydrogen gas. The wastes are gasified in a fluidized-bed reactor at a low temperature. Then, gaseous material and char produced in the fluidized-bed reactor are introduced into a high-temperature combustor, and gasified at a high temperature and ash content is converted into molten slag. After water scrubbing and a CO conversion reaction, the gas is separated into H.sub.2 and residual gas. The residual gas is then supplied to the fluidized-bed reactor as a fluidizing gas.

대표청구항 ▼

[ What is claimed is:] [1.] A method of treating wastes, said method comprising:gasifying by partially combusting said wastes in a fluidized bed reactor at a temperature of from 450.degree. C. to 950.degree. C., and thereby forming gaseous material and carbonous material, while crushing said carbono

[ What is claimed is:] [1.] A method of treating wastes, said method comprising:gasifying by partially combusting said wastes in a fluidized bed reactor at a temperature of from 450.degree. C. to 950.degree. C., and thereby forming gaseous material and carbonous material, while crushing said carbonous material by a fluidized bed in said fluidized bed reactor to thereby form char;discharging said gaseous material and said char from said fluidized bed reactor and introducing the thus discharged gaseous material and char into a combustor that is separate from said fluidized bed reactor and that is operated at a temperature sufficient to melt an ash content of said char, and therein gasifying said gaseous material and said char to form synthesis gas, while melting said ash content to thereby form molten slag;removing said molten slag from said combustor;cooling said synthesis gas to form cooled synthesis gas and to generate steam;introducing said cooled synthesis gas and steam into a CO converter and therein performing a CO conversion reaction to produce H.sub.2 and residual gas;separating said H.sub.2 from said residual gas; andsupplying said residual gas to said fluidized bed reactor as fluidizing gas for use in fluidizing said fluidized bed.