Waste plastics recycling by an entrained-flow gasifier |
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Authors: | Takatoshi Shoji Kenjiro Shindoh Hironori Ozaki Atsushi Sodeyama |
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Affiliation: | (1) Akashi Technical Institute, Kawasaki Heavy Industries, Ltd., 1-1 Kawasaki-cho, Akashi 673-8666, Japan Tel. +81-78-921-1679; Fax +81-78-921-1696 e-mail: shoji_takatoshi@khi.co.jp, JP |
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Abstract: | We studied an entrained-flow gasification process which efficiently converts waste plastics to energy at a high energy recovery
rate. Waste plastics, after being shredded to <8 mm or <14 mm, were fed into an entrained-flow gasifier with air and oxygen.
In the gasifier, organic substances were pyrolyzed, partially combusted, and then converted into synthetic gas (CO, H2) at a high temperature (over 1600 K). The clarified gasification characteristics were that the lower heat value (LHV) of
the product gas was over 4.2 MJ/Nm3 and the cold gas efficiency was approximately 60%. Other inert substances in the wastes such as ashes and metals were melted
into slag and condensed on bag filters. The bag filters and a water scrubber removed impurities such as dusts, heavy metals,
and hydrogen halides from the product gases. Solid hydrocarbons, which include char and soot, were removed at a hot cyclone
and on the bag filters.
Received: July 19, 2000 / Accepted: October 3, 2000 |
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Keywords: | Waste plastics Entrained-flow gasification Synthetic gas Slag Heavy metals |
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