Coal gasification device, coal gasification method and coal gasification combined power generation system

摘要

The gasification furnace and the heat recovery unit for recovering heat obtained by gasification of coal in the gasification furnace without burdening the subsequent equipment are provided in one Bessel and integrated into a coal gasification apparatus. The heat recovery section is formed immediately above the gasification furnace and is made up of a heat transfer tube which is orthogonal to the generated gas stream, the gasification furnace is constituted by the upper part of the furnace and the lower part of the furnace, and the upper stage nozzle is disposed at the upper part of the furnace, and the lower stage nozzle is disposed at the lower part of the furnace. The lower part of the furnace is supplied with coal and a large amount of oxidizer than the lower nozzle, and the temperature of the furnace is high enough to melt the ash, and the upper part of the furnace is supplied with coal and a small amount of oxidizing agent from the upper stage nozzle, and the temperature of the ash is not melted. . Further, by providing two stages of heat transfer tubes constituting the heat recovery portion at two stages, it is possible to reduce the temperature of the generated gas efficiently and to reduce the influence on the constituent material of the subsequent apparatus.