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In a coal gasification power generator, a coal gas 500 obtained by gasifying coal 100 by a gasifying furnace 1 is introduced into a desulfurization furnace 2 in which the coal gas 500 is desulfurized by limestone 400. A coal gas 501 after desulfurization is burned by a combuster 5 after it has passe

In a coal gasification power generator, a coal gas 500 obtained by gasifying coal 100 by a gasifying furnace 1 is introduced into a desulfurization furnace 2 in which the coal gas 500 is desulfurized by limestone 400. A coal gas 501 after desulfurization is burned by a combuster 5 after it has passed through a dust removing unit 3 so that a high temperature combustion gas 800 is supplied to a gas turbine 7. The gas turbine 7 drives a power generating unit. An exhaust gas 801 from the gas turbine 7 is supplied to an exhaust gas boiler 8. A char 60a produced in the gasifying furnace 1 and limestone 60b containing CaS emitted from the desulfurization furnace 2 are burned in an oxidation furnace 4, and by using the resultant combustion gas, water vapor 30a introduced from the exhaust gas boiler 8 is heated by a heat exchanger 10, and thereafter it is supplied to the gasifying furnace 1 as a gas 700. With the above construction, chemical energy possessed by the coal 100 is effectively converted into electric energy, and also the rate of desulfurization of coal gasifying gas is improved thereby reducing emitted sulfur oxide.

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A coal gasification power generator including a gas turbine which receives high temperature combustion gas from a combuster which burns coal gas to drive a power generating unit, said power generator comprising: a gasifying furnace (1) which receives coal (100) and oxidation gas (202, 202′) and form

A coal gasification power generator including a gas turbine which receives high temperature combustion gas from a combuster which burns coal gas to drive a power generating unit, said power generator comprising: a gasifying furnace (1) which receives coal (100) and oxidation gas (202, 202′) and forms a fluidized bed with fluidized particles of said coal and char produced by said furnace (1) to convert said coal into coal gas (500) and char (60a); desulfurization furnace (2) which introduces said coal gas (500) from said gasifying furnace (1) to fix and desulfurize sulfur compounds/contained in said coal gas (500) as CaS in limestone (400) in a fluidized bed which is formed as particles for fluidazation of said limestone (400) supplied; a dust removing unit (3) which introduces desulfurized coal gas (501) from said desulfurization furnace (2) to remove particles (60c) in said coal gas (501); an air compressor (6) for sending out pressurized air; a combuster (5) which introduces coal gas (502) after dust removal from said dust removing unit (3) and pressurized air (203) from said air compressor (6) to burn said coal gas (502) to produce high temperature combustion gas (800); a gas turbine unit including a gas turbine (7) which introduces said high temperature combustion gas (800) from said combuster (5), converts energy of said high temperature combustion gas (800) into mechanical energy for driving a coaxially coupled power generating unit and said air compressor (6); a char transfer unit (15) which receives char (60a) from said gasifying furnace (1) to boost and send out said char (60a); a desulfurization agent transfer unit (16) which receives limestone (60b) containing said CaS from said desulfurization furnace (2) to boost and send out limestone (60b) containing said CaS; oxidizing furnace (4) which receives char (60a) from said char transfer unit (15), limestone (60b) containing CaS from said desulfurization agent transfer unit (16) and oxidation gas (204, 204′) to oxidize the unburned part of said char (60a) and to convert said CaS to CASO4, and includes a heat exchanger (10) for heating water or water vapor with reaction heat caused by these oxidation reactions to send out combustion gas (700) after heat exchange by said heat exchange to said gasifying furnace (1); an exhaust gas boiler (8) for heating water and water vapor with combustion gas (801) sent out from said gas turbine (7); and a steam turbine power generating unit including a steam turbine (11) which receives overheated water vapor (30b) resulting from heating water or water vapor (30a) sent out of said exhaust gas boiler (8) by a heat exchanger (10) installed in said oxidizing furnace (4), and a power generating unit coupled to said steam turbine (11).