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research-article

Rheological Properties and Ignition and Combustion Characteristics of Biochar-Algae-Water (BAW) Slurry Fuels

[+] Author and Article Information
Mingming Zhu

The University of Western Australia, Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
mingming.zhu@uwa.edu.au

Zhezi Zhang

The University of Western Australia, Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
zhezi.zhang@uwa.edu.au

Pengfei Liu

The University of Western Australia, Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
21584734@student.uwa.edu.au

Dongke Zhang

The University of Western Australia, Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
dongke.zhang@uwa.edu.au

1Corresponding author.

ASME doi:10.1115/1.4039320 History: Received August 04, 2017; Revised January 04, 2018

Abstract

This study examined the rheological properties, ignition and combustion characteristics of biochar-algae-water (BAW) slurry fuels. A pine sawdust biochar with a median particle size (D50) of approximately 12 µm and algae chlorella vulgaris in dry powder form with D50 of approximately 19 µm were used. The BAW slurries with a constant solid loading of 40wt% and algae/biochar ratio varying from 0 to 0.2 by weight were prepared. The apparent viscosity was measured using a Haake VT550 cone-and-plate viscometer. The stability of the slurries was characterised using a "drop rod" method. Ignition and combustion characteristics of the slurries were studied using a suspended single-droplet technique. A single droplet of a slurry fuel with a diameter ranging from 0.5mm to 1.5mm was suspended on a silicon carbide fibre and burned in air at 1023K in an electrically heated tube furnace. The ignition and combustion processes of the droplet were recorded using a CCD camera at 200fps. The ignition delay time, burnout time and burning rate were determined. The BAW slurries showed shear-thinning flow behaviour. The slurries had higher viscosity and greater stability at higher algae proportion in the solid. The ignition and combustion process of BAW slurries followed the sequence of water evaporation, devolatilisation, ignition and combustion of the solid residue. The combustion of the residual solid was diffusion controlled under the experimental conditions and the burning rates of the BAW slurry droplets ranged from 0.15 to 0.25 mm2s-1.

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