Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Preparation of formed coke from biomass by sequence of torrefaction, binderless hot briquetting and carbonization

Wibawa, A., Ashik, U.P.M., Kudo, S., Asano, S., Dohi, Y., Yamamoto, T., Kimura, Y., Gao, X.ORCID: 0000-0003-2491-8169 and Hayashi, J-I (2022) Preparation of formed coke from biomass by sequence of torrefaction, binderless hot briquetting and carbonization. ISIJ International, 62 (8). pp. 1629-1638.

[img]
Preview
PDF - Published Version
Download (1MB) | Preview
Free to read: https://doi.org/10.2355/isijinternational.ISIJINT-...
*No subscription required

Abstract

This paper proposes a method of preparing high-strength formed coke from woody biomass without binder. Chipped and pre-dried Japanese cedar was heat-treated in an inert atmosphere (i.e., torrefied) at 225–325°C (Tt), pulverized to sizes in three different ranges, molded into briquettes (in the form of thick disk with diameter/thickness ≈ 2.5) at temperature up to 200°C by applying mechanical pressure of 128 MPa. The torrefied/briquetted cedar (TBC) was then converted into coke by heating to 1000°C in an inert atmosphere at normal pressure. This process sequence enabled to prepare coke having indirect tensile strength (St) of 8–32 MPa, which was much higher than that without torrefaction, below 5 MPa. The torrefaction greatly improved pulverizability of the cedar, which was further promoted by increasing Tt. St of TBC and that of coke both increased as the particle sizes of TBC decreased, but this explained only a minor part of significant effect of Tt on St of the coke. St was maximized at Tt = 275°C regardless of the degree of pulverization. The Tt effects on physicochemical properties of TBC and coke were investigated in detail. The difference in St of coke by Tt was mainly due to that in the increment of St along the carbonization at 500–1000°C. Fracture surfaces of the coke had particular morphologies that had been inherited from the original honeycomb structure of the cedar.

Item Type: Journal Article
Murdoch Affiliation(s): School of Engineering and Information Technology
Publisher: ISIJ International
Copyright: © 2022 The Iron and Steel Institute of Japan.
URI: http://researchrepository.murdoch.edu.au/id/eprint/66417
Item Control Page Item Control Page

Downloads

Downloads per month over past year