Lee Byoung-Hwa, Trinh Viet Thieu, Jeon Chung-Hwan
Pusan Clean Energy Research Institute, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
ACS Omega. 2021 Apr 2;6(14):9920-9927. doi: 10.1021/acsomega.1c00737. eCollection 2021 Apr 13.
Torrefaction is an appealing pretreatment method for improving the fuel properties of kenaf biomass before its utilization in thermochemical processes. This study evaluated and compared the impact of torrefaction on thermal behavior and kinetics during pyrolysis and gasification. Thermogravimetric analysis experiments were conducted at temperatures of 300-1173 K at several heating rates under N and CO atmospheres. The raw and torrefied kenaf (RK and TK) during CO gasification in the low-temperature region (<900 K) was found to exhibit a tendency that was similar to that of N. However, TK during CO gasification resulted in a lower maximum mass loss rate, delayed initiating temperature, and lower devolatilization index due to lower reactivity. In addition, the gasification reaction of CO and char was observed to occur in the high-temperature region (> 900 K), thus improving conversion efficiencies. The activation energy for TK in a CO atmosphere depending on the conversion was calculated using the distributed activation energy method. The activation of RK during CO gasification was higher than that of N. However, TK during CO gasification exhibited a lower activation energy compared to that of N, indicating its potential as a better feedstock during the CO gasification process and the ability to save energy.
烘焙是一种颇具吸引力的预处理方法，可用于在红麻生物质热化学过程利用之前改善其燃料特性。本研究评估并比较了烘焙对热解和气化过程中热行为及动力学的影响。在氮气和一氧化碳气氛下，于多个升温速率、300 - 1173 K的温度范围内进行了热重分析实验。结果发现，在低温区域（<900 K）进行一氧化碳气化时，未烘焙和烘焙后的红麻（RK和TK）表现出与在氮气中相似的趋势。然而，由于反应活性较低，一氧化碳气化过程中的TK导致最大质量损失率更低、起始温度延迟且挥发分指数更低。此外，观察到一氧化碳与焦炭的气化反应发生在高温区域（>900 K），从而提高了转化效率。使用分布活化能方法计算了一氧化碳气氛下TK随转化率变化的活化能。一氧化碳气化过程中RK的活化能高于氮气气氛下的。然而，一氧化碳气化过程中TK的活化能低于氮气气氛下的，这表明它在一氧化碳气化过程中作为更好的原料的潜力以及节能能力。
