Effect of pyrolysis heating rates on fuel properties of molded charcoal: Imitating industrial pyrolysis process

Liangmeng Ni, Zixing Feng, Tao Zhang, Qi Gao, Yanmei Hou, Yuyu He, Mengfu Su, Hao Ren, Wanhe Hu and Zhijia Liu

Renewable Energy, 2022, vol. 197, issue C, 257-267

Abstract: To investigate the relationship between fuel properties and pyrolysis heating rates (PHRs) of molded charcoals (MCs), biomass briquettes (manufactured by 70% bamboo and 30% wood blends) were pyrolyzed using various PHRs based on industrial production stages (preheating, primary pyrolysis, and carbonization stage). Proximate and ultimate analyses, as well as thermogravimetric and kinetics analyses, were performed for MCs. Results showed that PHRs had a significant effect on the quality and yield of MCs at the primary pyrolysis stage. Based on the production efficiency and energy performances, the PHRs were suggested to 5 °C/min, 1 °C/min, and 5 °C/min for preheating, primary pyrolysis, and carbonization stages. The higher heating value, energy enrichment factor, calorific value improvement, energy yield, and fuel ratio of optimal MCs were 34.02 MJ/kg, 1.777, 1.716, 71.65%, 55.27, and 11.51, respectively. The MCs had a minimum activation energy of 98.57 kJ/mol. The findings of this study will be useful in understanding and standardizing the manufacturing process of MCs.

Keywords: Bamboo; Chinese fir; Molded charcoal; Heating rate; Energy properties (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:197:y:2022:i:c:p:257-267

DOI: 10.1016/j.renene.2022.07.132

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