Gasifier, thermal power plant using gasifier, operating procedure of gasifier, and operating procedure of thermal power plant using gasifier

Abstract of the Disclosure An object of the present invention is to provide a gasifier which can maintain an efficiency of the gasifier high by carrying out a heating of a slag-tapping hole preventing an obstruction of the slag-tapping hole due to a solidification of a fused slag in accordance with an energy saving manner. In a gasifier provided with a gasification part gasifying a combustible content in a coal fed from a burner so as to form an ash content in the coal as a fused slag, a slag tapping part provided in a bottom portion of the gasification part and having a hole for falling down the fused slag in a center portion thereof, and a slag falling part just below the slag-tapping part, a syngas nozzle supplying a part of a syngas generated in the gasification part into the slag falling part is installed at a position of the slag falling part in the vicinity of the slag-tapping part, and an oxygen-containing gas nozzle supplying an oxygen-containing gas into the slag falling part is installed at a position which is below the syngas nozzle.