High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking CoalClick to copy article linkArticle link copied!
- Aditya WibawaAditya WibawaInterdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanMore by Aditya Wibawa
- U.P.M. AshikU.P.M. AshikInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanMore by U.P.M. Ashik
- Shinji KudoShinji KudoInterdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanMore by Shinji Kudo
- Shusaku AsanoShusaku AsanoInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanMore by Shusaku Asano
- Xiangpeng GaoXiangpeng GaoCentre for Water, Energy and Waste, Harry Butler Institute, Murdoch University, 90 South Street, Murdoch 6150, Western Australia, AustraliaMore by Xiangpeng Gao
- Jun-ichiro Hayashi*Jun-ichiro Hayashi*Email: [email protected]. Phone: +81 92 583 7796.Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanResearch and Education Center of Green Technologies, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, JapanMore by Jun-ichiro Hayashi
Abstract

In continuation of our previous study on production of high-strength metallurgical coke from torrefied softwood (cedar), we studied coke production from a mixture of torrefied cedar (TC) and noncaking coal by pulverization to sizes <100 μm, mixing, binderless hot briquetting, and carbonization. These sequential processes produced coke with a tensile strength of 5–17 MPa, which was equivalent to or greater than that of conventional coke (5–6 MPa), from TC-coal mixtures over the entire ranges of TC mass fraction in briquette of 0–100%, torrefaction temperature of 250–300 °C, and choice of coal (sub-bituminous or medium-volatile bituminous coal). The mixing of TC and coal hindered densification of coke due to hindrance of shrinkage of more-shrinkable TC-derived particles during the carbonization under many of the conditions. Nevertheless, positive synergy occurred in the coke strength at TC mass fractions of over 50%, where coal-derived particles were dispersed in the matrix of TC-derived particles, bonded to them during the carbonization, and behaved as a reinforcement of the matrix. The bonding between TC-derived and coal-derived primary particles was revealed by scanning electron microscopy. Copulverization of mixed TC and coal to sizes <40 μm before the briquetting gave cokes having strengths as high as 23–28 MPa. The fine pulverization increased the frequencies of mutual bonding of TC-derived particles and coal-derived particles and bonding between TC-derived and coal-derived particles per coke volume. The strength of coke from the TC-coal mixture generally followed volume-based additivity of strengths of cokes from TC and coal. This was realized by mixing primary particles of TC and coal within ≈10 μm scale or even smaller.
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This article is cited by 8 publications.
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