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Special Section on 2018 Clean Energy

Rheological Properties and Stability Characteristics of Biochar-Algae-Water Slurry Fuels Prepared by Wet Milling

[+] Author and Article Information
Pengfei Liu

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: Pengfei.Liu@research.uwa.edu.au

Mingming Zhu

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: Mingming.Zhu@uwa.edu.au

Zhezi Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: Zhezi.Zhang@uwa.edu.au

Dongke Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: Dongke.Zhang@uwa.edu.au

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 22, 2018; final manuscript received April 3, 2019; published online May 8, 2019. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 141(7), 070709 (May 08, 2019) (5 pages) Paper No: JERT-18-1563; doi: 10.1115/1.4043551 History: Received July 22, 2018; Revised April 03, 2019

This study was aimed to understand the rheological properties and stability characteristics of biochar-algae-water (BAW) slurry fuels prepared by wet milling. A pine sawdust biochar and a chlorella vulgaris algae were used in preparing the slurry fuels. The BAW slurries were formulated by mixing the biochar, algae, de-ionized water, lignosulfonic acid sodium salt, and then the mixture was ball-milled for various times. The BAW slurries with a constant solid loading of 45 wt % were prepared with varied algae proportion in algae/biochar mixture. The apparent viscosity and stability of BAW slurries were measured. It was found that D50 of the particles of the solid in the slurries decreased with increasing milling time. The viscosity of the slurries decreased first and then increased as milling time increased, reaching a minimal value when D50 of the solid was between 3 and 7 μm. The lowest viscosity of BAW slurries achieved at a given solid loading increased with increasing the algae proportion in the solid. The BAW slurries showed better stability at higher algae proportions due to enhanced flocculation.

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Figures

Grahic Jump Location
Fig. 1

Effect of milling time on the viscosity of BAW slurry fuels

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Fig. 2

Effect of milling time on particle size distribution of slurries: (a) B95A5, (b) B90A10, (c) B85A15, and (d) B80A20

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Fig. 3

Effect of milling time on median particle size (D50)

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Fig. 4

The water uptake capacity of biochar particles

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Fig. 5

The scanning electron microscopy images of biochar particles with (a) D50 of 53 μm and (b) D50 of 10 μm

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Fig. 6

The lowest viscosity of achieved for BAW slurry fuels with different solid loading

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Fig. 7

The stability characteristics of BAW slurry fuels

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