PURPOSE: To easily flow melted slag out of a discharge port without solidifying it, by composing the lower half of a combustion chamber of refractory, as well as to protect the inside wall of a combustion chamber by composing the upper half of a combustion chamber which is to be heated extremely high of a water-cooled metallic wall.
CONSTITUTION: The upper shell of a main combustion chamber is composed of an inner cylinder 13 fitted into an outer cylinder 12, forming a cooling water passage. 3 or 4 injection ports for swirling heated-air are provided in the upper part of a main combustion chamber to the direction of a cut line against the inside wall of an inner cylinder 12, being connected to a heated- air feed pipe 10, which passes through the inner and the outer cylinders of a main combustion chamber. On the other hand, the lower shell of a main combustion chamber is composed of a threefold wall made by fitting an inner cylinder, made of a high-temperature resistant refractory 15, into the inside wall of an outer cylinder 14 in the lower part of a main combustion chamber of double wall structure which forms a water-cooled wall. In the lower part of the lower shell, a water jet nozzle 20 which crushes and cools melted slag is provided to a port to which slag flows down, being connected to a slag discharger. Besides, a high-temperature gas outlet 17 is provided in the middle part of the lower shell in order to discharge high-temperature combustion gas, being connected to a power generating channel by the intermediary of an accelerating nozzle which is not shown.
IWATOU YOUSABUROU
IRINO MITSUHIRO
