Energy Recycling of Recycled Plastic-Resin Powder : Effects of a Replacement Rate of PET-Powder on Combustion Behavior

An Investigation on Thermal Recycling of Recycled Plastic Resin (Spherically Symmetric Analysis of Abrupt Heating Processes of a Micro Plastic-Resin Particle)

“…In this chapter, the effects of the limited relation concerning the heat transfer process around the particle are first discussed, since the relative flow around the particle is considered to be most influential in the total life time through the heat transfer coefficient. Usefulness of the simplified analysis to estimate the residence time necessary for complete gasification is then examined by comparing the particle life time numerically obtained in this paper with that experimentally obtained in the preceding experiments (2,3) .…”

“…4(a) gives a life time of 13.2 ms for a PET particle having a diameter of 150 µm. These numerical results suggest that the operation conditions in the preceding burner experiments (2,3) can not satisfy the critical residence time required for complete decomposition of PET particles having an assigned median diameter of 145 µm, and that a greater part of particles larger than the assigned diameter may be emitted without burnout. It is concluded that, so long as the reasonable considerations are made on the heat transfer process around a micro plastic resin particle, even the simplified analysis proposed in this paper can predict reasonably the overall combustion characteristics of where the ambient gas temperature is set to Tg = 1600 ℃ plastic resin powder in the practical burner systems.…”

“…It was found that, when the plastic resin powder with a mass-median diameter of 145 µm was supplied to the burner, a large part of it was exhausted without burnout in the open atmospheric operation, caused by intense cooling due to entrainment of ambient cold air, whereas powder was perfectly consumed in the in-furnace operation, promoted by the high temperature oxidizing atmosphere in the furnace. Also found was that, since the proposed burner can realize not only spatially uniform temperature fields within the furnace, but also clean exhaust gas emission in the in-furnace operation, it has sufficiently high potential not only to be applied to new ceramic burner systems but also to be retro-fitted to the established ceramic burners (3) . To realize wide application of the proposed burner using plastic resin powder as an additional fuel to the industrial and commercial burner systems including retro-fitting to the established burner systems, however, it is indispensable to develop a new practical burner providing with fine burn-up characteristics even under open cold atomspheric operation.…”

“…Variations of the temperature history and the life time with the ambient gas temperature and the initial particle diameter are numerically estimated, by dividing the entire heating process into four independent periods; the solid heating period, the melting period, the liquid heating period, and the thermal decomposition period. Effects of the Nusselt number on the particle life time are also discussed and the life time estimated is compared with that measured in the ceramic burner experiments (2,3) . …”

An investigation on thermal‐recycling of recycled plastic resin (spherically symmetric analysis of abrupt heating processes of a micro plastic‐resin particle)

“…It was found that, when the plastic resin powder with a mass-median diameter of 145 µm was supplied to the burner, a large part of it was exhausted without burnout in the open atmospheric operation, caused by intense cooling due to entrainment of the ambient cold air, whereas it was perfectly consumed in the in-furnace operation, promoted by the high temperature oxidizing atmosphere in the furnace. It was also found that, since the proposed burner can realize not only spatially uniform temperature fields within the furnace but also clean exhaust gas emission in the in-furnace operation, it has sufficiently high potential not only to be applied to new ceramic burner systems but also to be retro-fitted to established ceramic burners [3]. In order to realize wide application of the proposed burner using plastic resin powder as an additional fuel for industrial and commercial burner systems including retro-fitting of the established burner systems, it is indispensable to develop a new practical burner providing fine burn-up characteristics even under cold open atmospheric operating conditions.…”