2013 Volume 55 Issue 172 Pages 116-122
The thermal radiation between fly ash and the solid wall of high temperature or low temperature, was applied to decomposition of dioxins contained in fly ash in an exhaust gas. We used a solid radiation type heating apparatus designed to carry out the temperature control of the solid wall with a tubular flame and an electrically heated wire, the maximum processing gas volume of 350Nm3/h, which has a radiation wall of the cylinder type which consists of 450 mm in inside diameter, and the effective length of 1000 mm. We investigated the decomposition characteristics of the dioxins contained in fly ash using imitation gas and actual exhaust gas of an industrial-wastes incinerator. We found that the surface unevenness becomes small notably by radiation heating of fly ash, and the maximum dioxins decomposition rate of about 66%, in the holding time 0.2s, without change of the homologue distribution of dioxins, was obtained. The value of the chloride concentration after radiation processing of fly ash decreased below in half in before processing.
