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research-article

Pelletization of Refuse-Derived Fuel Fluff to Produce High Quality Feedstock

[+] Author and Article Information
Charley/J Sprenger

University of Saskatchewan, Department of Chemical and Biological Engineering, 57 Campus Drive, Saskatoon, SK, Canada, S7N 5A9
charley.sprenger@usask.ca

Lope G. Tabil

University of Saskatchewan, Department of Chemical and Biological Engineering, 57 Campus Drive, Saskatoon, SK, Canada, S7N 5A9
lope.tabil@usask.ca

Majid Soleimani

University of Saskatchewan, Department of Chemical and Biological Engineering, 57 Campus Drive, Saskatoon, SK, Canada, S7N 5A9
mas233@mail.usask.ca

Joy Agnew

Prairie Agricultural Machinery Institute, 2215 8th Avenue, Humboldt, SK, Canada, S0K 2A0
jagnew@pami.ca

Amie Harrison

Prairie Agricultural Machinery Institute, 2215 8th Avenue, Humboldt, SK, Canada, S0K 2A0
aharrison@pami.ca

1Corresponding author.

ASME doi:10.1115/1.4039315 History: Received July 12, 2017; Revised January 10, 2018

Abstract

Municipal solid waste (MSW) may be a suitable feedstock for thermochemical conversion. Current technologies process the MSW into refuse-derived fuel (RDF) fluff before conversion. Bench- and pilot-scale densification trials were conducted to determine the parameters required to produce a high quality feedstock from the MSW-RDF material in pellet form. The RDF was densified, as well as the biodegradable (paper and wood) fraction of the RDF stream to compare quality of pellets for the two material compositions. A single pelleting trial was conducted to examine the compaction parameters that would produce high quality pellets: sample material, grind size, moisture content, temperature and pelleting pressure. It was determined that quality pellets, for both materials, were formed at a grind size of 6.35 mm at 16% moisture under pelleting conditions of 90°C and 4000 N applied load. Pilot-scale pelleting was then completed to emulate industrial pelleting process utilizing the parameters from the single pelleting trials that were deemed to produce quality pellets. All of the samples produced durable pellets (88-94%), with the ash content around 20%. A techno-economic feasibility study determined that 6.35 mm diameter pellets could be produced for an average cost of $38/Mg, although the aggressive process of the size reduction required indicates that it may not be a technically feasible option.

Copyright (c) 2018 by ASME
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