Abstract: Power generation with a gas turbine using a gasified fuel of inferior quality is accomplished with high efficiency by a method which comprises bleeding part of highly compressed air emanating from an air compressor driven by a gas turbine and introducing the part of highly compressed air into an oxygen adsorbing tower containing an oxygen adsorbent thereby causing the oxygen from the highly compressed air to be adsorbed by the oxygen adsorbent and, at the same time, allowing the nitrogen gas from the highly compressed air to flow in a highly compressed state through the oxygen adsorbing tower, desorbing the adsorbed oxygen from the oxygen adsorbent under a vacuum, compressing the oxygen gas resulting from the desorption and gasifying a fuel of inferior quality with the compressed oxygen gas as an oxidizing agent, effecting combustion of the gasified fuel of inferior quality with the remainder of the compressed air produced by air compressor, mixing the gas arising from the combustion with the highly compresse

Abstract: A self-reactivating denitrating method and equipment in which the exhaust gas from the combustor flows and goes through an adsorbing catalyst tower filled with Cu(II) exchangeable high silica zeolite at a temperature of normal to 750.degree. C. to let NOx contained in the exhaust gas be adsorbed in the zeolite and decomposed into N.sub.2 and O.sub.2 resulting in achievement of cleaning the exhaust gas and then the zeolite saturated with NOx is put in touch countercurrently with air for combustion to let the adsorbed NOx be desorbed to reactivate Cu(II)exchangeable high silica zeolite and, at the same time, the air for combustion containing the adsorbed NOx is sent into the furnace of the combustor to decompose a part of NOx into N.sub.2 and O.sub.2 under an interfurnace combustion atmosphere.

Abstract: A method and equipment for desulfurizing exhaust gas from a combustor in which the exhaust gas containing SO.sub.2 from the combustor is brought into contact with SO.sub.2 absorbent to remove SO.sub.2 and is blown down out of the system; on the other hand, the SO.sub.2 absorbent absorbed SO.sub.2 is brought into contact with air to desorb SO.sub.2 and the air containing the desorbed SO.sub.2 is supplied to the combustor as air for combustion to burn to raise the SO.sub.2 concentration in the exhaust gas from the combustor; and the exhaust gas not undergone contact with the absorbent or a part of the air undergone contact with the SO.sub.2 absorbent are taken out of the system.