| 摘要 |
A highly efficient integrated coal gasification combined cycle plant is provided having a dust removing system which can reliably exhibit a desired dust removing performance and which can maintain high operational reliability such that the occurrence of dust leaks is prevented. The integrated coal gasification combined cycle plant has a coal gasification furnace configured to yield a coal gas by gasification of coal, a gas turbine generator driven with a gas turbine which is operated using the coal gas as fuel and which discharges a high-temperature combustion exhaust gas, an exhaust heat recovery boiler configured to recover heat from the high-temperature combustion exhaust gas and to produce steam, and a steam turbine generator driven with a steam turbine operated using the steam produced by the exhaust heat recovery boiler. In the above plant, a flue gas desulfurization device configured to desulfurize the coal gas is provided downstream of the gas turbine and the exhaust heat recovery boiler, and the dust removing system which is configured to recover char and to remove dust from the coal gas has at least one line containing a cyclone, a front-stage filter, and a rear-stage filter.
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