Plastics Wastes Incineration by Rotary Kiln

Abstract

Concerning the incineration of plastics wastes, fundamental studis are being carried out by several researches and various kinds of equipment have been developed so far. However, many problems still remain unsolved, taking only combustion phenomena, for example, problems as change of the state of material with temperature rise, unusual rist of gas temperature due to high heating value and emission of black smokes or injurious gases, which is the most characteristic phenomenon in plasticswastes incineration.
In order to solve these problems, the author made a trial use of rotary kiln in the first combustion chamber of plastics wastes incinerating system. In this system, thermal decomposition is induced by control of the atomospheric temperature and the feeding exaust gas flow in the first chamber and unburnt gas generated in this chamber is led to the next re-combustion chamber for perfect combustion. Then a pilot plant of this system having an incinerating capacity of 200 kg/hr was built and incineration test was carried out. It was confirmed that plastics wastes could be completely burnt without emitting black smokes by control the temperature in the kiln below firing point.