INTEGRATED GASIFICATION COMBINED CYCLE POWER GENERATION FACILITY AND METHOD FOR OPERATING INTEGRATED GASIFICATION COMBINED CYCLE POWER GENERATION FACILITY

摘要

Provided is an integrated coal gasification combined cycle power generation facility (1) equipped with: a gasification furnace (20) that generates combustible gas from pulverized coal; a gas cooler (30); gas turbine equipment (50); an auxiliary fuel supply unit (60) that supplies an auxiliary fuel to the gas turbine equipment (50); a waste heat recovery boiler (70); steam turbine equipment (80); generators (90); and a circulation line unit (100) that circulates cooling water. The waste heat recovery boiler (70) has a first medium-pressure coal economizer (70a) and a second medium-pressure coal economizer (70b). When the combustible gas generated from the pulverized coal is burned, a serial heat exchange line is formed wherein cooling water passes through the first medium-pressure coal economizer (70a), the second medium-pressure coal economizer (70b), and the gas cooler (30). When the auxiliary fuel is burned, separate heat exchange lines are formed, wherein the cooling water separately passes through the first medium-pressure coal economizer (70a) and the second medium-pressure coal economizer (70b).