Pyrolysis characteristics and char reactivity of Oedogonium sp. and Loy Yang coal

Zhu, Youjian, Kwong, Chi Wai, Van Eyk, Philip J., de Nys, Rocky, Wang, Dingbiao, and Ashman, Peter J. (2015) Pyrolysis characteristics and char reactivity of Oedogonium sp. and Loy Yang coal. Energy & Fuels, 29 (8). pp. 5047-5055.

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Abstract

The proposition of combining the application of algae in wastewater treatment, CO2 fixation, and energy production maximizes the opportunity of algal bioremediation. In this paper, the freshwater macroalga Oedogonium, a key target species for the bioremediation of waste waters, was investigated for its utilization in energy production via gasification or co-gasification with coal. The pyrolysis characteristics of Oedogonium and the effects of pyrolysis conditions on char reactivity were investigated in this paper, and an Australian lignite was also studied for comparison purposes. The pyrolysis process of Oedogonium and coal can be divided into three stages: moisture evaporation, volatile release, and decomposition of the remaining carbonaceous compounds. However, the devolatilization of Loy Yang coal was slower and occurred over a wider temperature range compared to Oedogonium. As the heating rate increased, the pyrolysis curves for both Oedogonium and Loy Yang coal shifted to higher temperatures. To investigate the effects of pyrolysis conditions on char reactivity, a tube reactor was employed to generate char samples under a range of pyrolysis conditions. The produced char samples were characterized using a CHN analyzer and scanning electron microscopy technique. It was found that char samples almost maintain their original shape following pyrolysis at a low heating rate. However, evidence of char swelling was observed in the structure of chars prepared at a high heating rate. Pyrolysis conditions also had a significant influence on the reactivity of the derived chars. Char reactivity for both fuels was enhanced at a higher heating rate and lower pyrolysis temperature. Oedogonium char reactivity was around 2–5 times that of Loy Yang char prepared under the same pyrolysis conditions. However, the differences in reactivity became less significant as the pyrolysis temperature increased. Oedogonium has a higher devolatilization rate and higher char reactivity than Loy Yang lignite. It implies that it is easier to be gasified, and the co-gasification with lignite is advantageous.

Item ID: 41863
Item Type: Article (Refereed Research - C1)
ISSN: 1520-5029
Funders: China Scholarship Council (CSC), Australian Research Council (ARC), SQC Pty Ltd, Australian Renewable Energy Agency (ARENA), Muradel Pty Ltd, MBD Energy, Melbourne, Australia
Projects and Grants: Project of Excellent Scientist Fund in Henan (Project 12410051002), ARC LP100200616
Date Deposited: 08 Dec 2015 14:22
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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