An Investigation on Thermal Recycling of Recycled Plastic Resin : (Some Experimental Approaches for Reducing Unburnt Particle Emission in the Recycled PET-Resin Powder Combustion)

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The possibility and applicability of thermal recycling of waste PET-resin have been investigated in the open atmospheric operation by supplying PET-resin powder as an auxiliary or additional fuel to the proposed twin-fuelled burner. In the preceding experiments, flow characteristics and burning processes of PET-particles in the proposed burner were investigated using PIV/PTV measurements. Appearances of flying PET-particles were optically observed and analyzed by using the double-pulsed laser, and the particle diameter was evaluated as an equivalent diameter. According to the results, some of the key factors for reducing the unburnt rate of PET-particles were clarified. In this paper, by taking these factors into consideration, an experimental attempt to reduce unburnt particle emission in the PET-resin powder combustion is carried out by varying the diameter of PET-powder supply pipe. The results specify that the increase in the dispersion degree of PET-particles reduces certainly the unburnt rate of PET-powder.