| 摘要 |
PROBLEM TO BE SOLVED: To completely eliminate toxic substances in exhaust gas by gasifying combustible wastes at a specific high temperature, removing dust and salt from generated gas at a specific temperature, and burning the gas removed of dust and salt in a boiler with a regenerative burner even in the case of a change in formed gas of a waste gasifying furnace. SOLUTION: A high temperature gasification direct melting furnace 11 is used as a gasification furnace of combustible wastes, and gas formed by gasifying the wastes is heated to 800 deg.C or more, preferably to the order of 1000 deg.C. A calorific value of the formed gas is recovered by a boiler 12. Further, after the gas is cooled to 350 deg.C or less by a water cooling type gas cooler 13, preferably to the order of 200 deg.C, the gas is removed of dust and HCl. In this case, a bag filter 14 is used to remove dust, and slaked lime is sprayed into the gas at the upstream side of the bag filter to remove HCl. In this manner, the gas removed of dust and salt is caused to be burned in a secondary combustion furnace (boiler) 15. In the secondary combustion furnace 15 is provided a regenerative burner for alternate burning of the processed gas. |
