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Thermal recycling of recycled plastic resin is focused in this investigation. Fine grinding of plastic resin and preparation of high temperature oxidizing atmosphere are indispensable for effective and successful burn-up of plastic resin. Polyethylene terephthalate resin powder is employed and high temperature oxidizing atmosphere is generated downstream an annular burner. Through a circular nozzle set coaxially in the closed bottom end of the annular burner, PET-powder and propane-air mixture are issued vertically upward into the high temperature oxidizing atmosphere. Temperature and O 2 concentration fields downstream the annular burner are first examined by varying the circular jet equivalence ratio with the air flow rate kept constant and without PET-powder supply. PET-powder having a mass-median diameter of either 89.7 µm or 145 µm is then issued into the high temperature region along with propane-air mixture by varying the PET-powder mass flow rate. Appearances of the PETpowder flame are observed using a high-speed CCD video camera and unburnt PET particles are traced during their passages in the high temperature region. Variation of O 2 concentration fields due to PET-powder combustion is also measured in the PET flame. According to the results, overall limit conditions for effective burn-up of PET-powder are finally discussed.

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