Waste gasification melting furnace

A waste gasification melting furnace comprising:

• a shaft portion configured to dry and pyrolyze wastes charged into the shaft portion, the shaft portion having a waste charging port and a furnace gas exhaust port provided on an upper side of the shaft portion and an opening on a bottom side of the shaft portion for discharging wastes;
• a melting furnace portion arranged in such a manner that a core of the melting furnace is shifted from a core of the shaft portion, the melting furnace portion having, on an upper side of the melting furnace, an opening through which pyrolyzed wastes and a carbon-based solid fuel are supplied, and having, on a furnace bottom side of the melting furnace, a tuyere through which oxygen-enriched air for combustion is blown into the melting furnace portion;
• and
• a communicated portion configured to connect between the bottom-side opening of the shaft portion and the upper-side opening of the melting furnace portion, wherein
• the communicated portion includes:
• a carbonizing grate portion disposed at a position where a load of the wastes charged in the shaft portion is received;
• a blower configured to blow air used for drying and pyrolysis into the shaft portion from the carbonizing grate portion;
• and a supply device configured to supply pyrolyzed wastes being on the carbonizing grate portion to the upper-side opening of the melting furnace portion,
• the carbonizing grate portion includes:
• a supply carbonizing grate disposed on an upper-stage side of the carbonizing grate portion;
• and a dry distillation carbonizing grate disposed on a lower-stage side of the carbonizing grate portion,
• the supply device includes:
• a first supply device for supplying wastes on the supply carbonizing grate toward the dry distillation carbonizing grate;
• and a second supply device for supplying carbonized wastes on the dry distillation carbonizing grate toward the melting furnace portion, and
• in order to facilitate drying and pyrolysis utilizing combustion heat from wastes themselves in the carbonizing grate portion, the air for drying and pyrolysis is blown into the shaft portion from the carbonizing grate portion in such a manner that the air contains 60% or more of a total amount of oxygen to be blown into the furnace;
• oxygen delivery to be supplied from the tuyere in the melting furnace portion is set to be less than 40% of the total amount of oxygen to be blown into the furnace;
• and a supply rate (V2) of the second supply device is set to be greater than a supply rate (V1) of the first supply device (V2>V1).