Gasifying apparatus with variable gasifier and used as both power generator and combustion boiler, and method of driving the same

A method of driving a gasifying apparatus comprising:

• a variable gasifier including an introduction chamber, a gasification chamber, and an outer chamber, wherein the gasification chamber and the outer chamber communicate with a first gasification injection hole and a second gasification injection hole respectively, a filtration device filtering synthesis gas produced by the variable gasifier;
• a feeder controller controlling a feeding direction of the synthesis gas filtered by the filtration device;
• and a combustion boiler and a gas engine driven with the synthesis gas selectively provided by the feeder controller, the method comprising the steps of:
• introducing fuel through a fuel feeder to be accumulated in a gasification chamber of a gasifier while blocking oxygen from being introduced;
• determining whether the synthesis gas, which is produced by gasifying the fed fuel, is used for power generation or for a combustion boiler;
• communicating a synthesis gas discharging hole of a passage opening/closing unit with the introduction chamber or the outer chamber according to the determination;
• performing upflow gasification or downflow gasification by feeding the gasification agent through a first or a second gasification agent injection hole according to the determination;
• producing the synthesis gas by performing the upflow gasification or the downflow gasification according to the performance of the upflow gasification or the downflow gasification;
• filtering foreign matter contained in the product synthesis gas;
• and
• generating electric power by feeding the synthesis gas filtered in the filtration into the gas engine or recovering heat by feeding the filtered synthesis gas into the combustion boiler.