Patent ID: 8893506

Claim:
A method for operating an IGCC power plant, comprising the following steps: supplying a solid fuel, steam, and oxygen to a gasifier; supplying the coal gas from the gasifier, comprising CO and steam, to at least one shift stage, where a conversion of the CO with steam primarily into CO 2 and hydrogen takes place; subjecting the coal gas to at least one gas cleaning step, with the gas cleaning step or steps being disposed upstream of, downstream of, or between individual shift stages; conducting hydrogen- and CO 2 -containing coal gas over a membrane, which selectively at least partially separates the hydrogen from the coal gas, with a flushing gas being used on the side of the permeate; supplying the coal gas depleted of hydrogen to a CO 2 conditioning step; and supplying the separated hydrogen, together with the flushing gas, to a gas turbine having a downstream steam turbine; and wherein the flushing gas for the membrane is part of the waste gas produced in the gas turbine; and wherein the flushing gas is conducted directly from a heat recovery boiler connected downstream of the gas turbine to a compressor and then to the permeate side of the membrane.