A novel mechanical kiln for bamboo molded charcoals manufacturing
2022
Ni, Liangmeng | Feng, Zixing | Gao, Qi | Hou, Yanmei | He, Yuyu | Ren, Hao | Su, Mengfu | Liu, Zhijia | Hu, Wanhe
To upgrade the industrial techniques of bamboo molded charcoals (BMCs), a novel mechanical kiln was designed with the new heating method, high pyrolysis efficiency, and reuse of self-release gaseous. In this research, BMC-1 and BMC-3 were produced by novel mechanical kiln with pyrolysis temperature 650 °C (5090 min) and 389 °C (5430 min). BMC-2 was produced by brick kiln with pyrolysis temperature 680 °C (22505 min). Proximate and kinetic analyses, Cone Calorimetry, and X-ray fluorescence were used to investigate the energy properties and ash fusion characteristics of BMCs. It was concluded that the efficiency of novel mechanical kiln was increased by 320.44%, compared with brick kiln. The physical and mechanical performs of BMCs were improved by novel mechanical kiln. The ash, fixed carbon and moisture content of BMC-1 and BMC-3 met the requirements of EN 1860-2:2005. All BMCs had a stable combustion process, but BMC-1 and BMC-3 owned a higher reactivity and a lower mean yield of CO (1.78 kg/kg) and CO₂ (15.12 kg/kg). In addition, the novel mechanical kiln increased the content of SiO₂ and reduced the content of alkali metal in ash samples, resulting in variation of fusion characteristics and reducing the risk of fouling. These findings will be helpful to provide a scientific guidance to optimize the manufacturing process of BMCs.
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