PURPOSE: To carry out heat recovery in high efficiency, in preparing particulate slag, by adjusting the variation of the high temp. gas amount in a primary cooling gas recirculation system by the high temp. gas amount of a secondary cooling gas recirculation system.
CONSTITUTION: In continuously preparing highly vitrified particulate slag having no fluffy slag mixed therein from molten slag intermittently flowed down from a supply trough 11, a high temp. gas obtained by heat exchange between a primary cooling gas and finely divided slag is supplied to a slag heat recovery boiler 4 but the variation of a high temp. gas amount in a primary cooling gas recirculation system is compensated by adjusting the high temp. gas amount in a secondary cooling gas recirculation system and the regular operation of the boiler is enabled to carry out heat recovery in high efficiency.
KATOU HIDEO
FUJIURA MASAMI
SAKAKIBARA MICHIAKI
