METHOD AND DEVICE FOR DIOXIN REDUCTION

PROBLEM TO BE SOLVED: To efficiently burn and decompose a dioxin reduction obstructing substance, and reduce the discharge of dioxin by promoting the decomposition of dioxin, by thermally keeping the whole body in a combustion cylinder within a specified temperature range extending to a specified zone, by the heat energy owned by an incineration gas. SOLUTION: This dioxin reducing device 4 is constituted of a combustion cylinder 5 comprising an internal cylinder 6 and an external cylinder 7, a combustion device 11 which is provided on the upper end section of the internal cylinder 6, and a heat- keeping body 21 which is provided at the lower end of the internal cylinder 6. A flame 15 is formed by a produced gas 3 comprising a fuel and combustion air, and the combustion is continued. The temperature of the flame coming out from a nozzle 12 becomes one thousand and several hundreds degree, but an introduction hole for the produced gas 3 is provided on the internal cylinder 6, and the produced gas 3 flows in as secondary air, and the temperature of a combustion gas 19 at the lower section of the internal cylinder 6 becomes 850-950 deg.C. A gas residing time in the internal cylinder 6 until the produced gas is introduced to the heat-keeping body 21 is short, but the gas temperature high, and the reduction of dioxin occurs in this period as well.