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Towards circular economy solutions for the management of rice processing residues to bioenergy via gasification

Vaskalis, Ioannis; Skoulou, Vicky; Stavropoulos, George ; Zabaniotou, Anastasia

Authors

Ioannis Vaskalis

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Dr Vicky Skoulou V.Skoulou@hull.ac.uk
Director of Research in Chemical Engineering ;Lecturer in Chemical Engineering-Bioenergy ; PI of the B3: Biomass waste- Bioenergy- Biochars Challenge Group

George Stavropoulos

Anastasia Zabaniotou



Contributors

Abstract

An economic assessment of two circular economy scenarios of fluidized bed gasification-based systems for combined heat and power (CHP) generation, fueled with rice processing wastes, was conducted. In the first scenario, the gasification plant with a capacity of 42,700 t/y of rice husks provides a waste management solution for 5 small rice processing companies, located at the same are, while in the second scenario the gasification unit of 18,300 t/y capacity provides a waste management solution to only one rice processing plant, being a custom-made solution. The first scenario is the most economically viable, with an annual revenue of 168 €/(t*y), very good payout time (POT=1.05) and return in investment (ROI=0.72). The economic assessment was based on experiments performed at a laboratory-scale gasification rig, while the economic analysis was based on the SMARt-CHP technology, developed at Aristotle University, Greece. The experimental proof of concept of rice husks waste gasification was studied at a temperature range 700-900oC, under an under-stoichiometric ratio of O2/N¬¬2 (10/90 v/v), as gasification agent. Producer gas’s LHV maximized at 800oC (10.9 MJ/Nm3), while the char’s BET surface reached a max of 146 m2/g at 900oC. Recommendations were also provided for a potential pretreatment of rice husks in order to minimize de-fluidization problems of the gasification system.

Journal Article Type Article
Publication Date 2019-11
Journal Sustainability
Print ISSN 2071-1050
Electronic ISSN 2071-1050
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 22
Article Number 6433
APA6 Citation Vaskalis, I., Skoulou, V., Stavropoulos, G., & Zabaniotou, A. (2019). Towards circular economy solutions for the management of rice processing residues to bioenergy via gasification. Sustainability, 11(22), https://doi.org/10.3390/su1122643
DOI https://doi.org/10.3390/su1122643
Keywords Circular economy; Rice husks; Waste management; CHP; Gasification; Economic assessment; Ash pretreatment
Publisher URL https://www.mdpi.com/2071-1050/11/22/6433

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© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).







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