Thermal History of Wood Particles in Molten Salt Pyrolysis
Thermal History of Wood Particles in Molten Salt Pyrolysis
复制标题
DOI：
10.1021/ef301121j
复制
发表时间：
2012-09
期刊：
影响因子：
5.3
通讯作者：
H. Nygård;Filip Danielsen;E. Olsen
中科院分区：
文献类型：
--
作者：
H. Nygård;Filip Danielsen;E. Olsen
熔融盐热解是一种热化学转化过程，其中生物质被进料到熔融盐浴中并被熔融盐浴加热。熔盐具有非常高的热稳定性、良好的传热特性以及在生物质中发现的大分子的裂解和液化中的催化作用。本研究通过记录木材碎料在熔盐热解过程中的热历史来研究熔盐的传热特性。在500 °C的FLiNaK熔体中用具有恒定长度（L = 30 mm）和变化直径（d = 1-8 mm）的圆柱形山毛榉和松木颗粒进行了实验。在颗粒中心的热历史已被用来评估的反应温度，加热速率，和脱挥发分的时间。结果进行了比较，在流化砂床的类似研究。结果表明，对于直径≤ 4 mm的圆柱体，FLiNaK具有较高的加热速率，而对于较大的圆柱体，其加热过程主要由热传导控制。
Molten salt pyrolysis is a thermochemical conversion process in which biomass is fed into and heated up by a molten salt bath. Molten salts have very high thermal stability, good heat transfer characteristics, and a catalytic effect in cracking and liquefaction of large molecules found in biomass. In this study, the heat transfer characteristics of molten salts are studied by recording the thermal history of wood particles in molten salt pyrolysis. Experiments have been carried out with cylindrical beech and pine wood particles with constant length (L = 30 mm) and varying diameter (d = 1–8 mm) in a FLiNaK melt with a temperature of 500 °C. The thermal history at the particle center has been used to evaluate the reaction temperatures, the heating rates, and the devolatilization times. Results have been compared with a similar study in a fluidized sand bed. It is found that FLiNaK gives significantly higher heating rates for cylinders with d ≤ 4 mm. For larger cylinders, the process is dominated by heat tra...