Biochar production through slow pyrolysis of different biomass materials: Seeking the best operating conditions
Biochar production through slow pyrolysis of different biomass materials: Seeking the best operating conditions
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DOI：
10.1016/j.biombioe.2018.07.019
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发表时间：
2018-10-01
影响因子：
6
通讯作者：
Manso, Jose A.
中科院分区：
文献类型：
--
作者：
Manya, Joan J.;Azuara, Manuel;Manso, Jose A.
三个操作参数（峰值温度，压力，和热解气氛）在缓慢热解的三个生物质来源（玉米秸秆，葡萄芽，和两相橄榄磨废物）的影响进行了广泛的分析。采用二水平全因子试验设计，考察了上述因素对生物炭潜在稳定性及主要热解产物产率的影响。为了评估生物质原料的效果，将设计分为三个模块（每个生物质原料一个模块）。从统计分析的结果表明，与其潜在的稳定性相关的生物质炭的性质主要受峰值温度的影响，并在较小程度上，生物质原料。当压力升高时，观察到采出气体的产率显著增加。总气体产率的这种增加部分是由于CO、CH 4和H-2的较高释放。使用的热解气氛的CO2（而不是N-2）没有导致任何显着的变化，无论是在热解产物的分布，也没有潜在的生物炭的稳定性。然而，当使用CO2作为载气时，观察到CO2产率以产生的CO2为代价显著增加。本文报道的研究结果表明，在CO2气氛下通过加压缓慢热解处理生物质是有趣的，以同时获得两个有价值的产品：具有适当的碳封存潜力的生物炭，和具有适当组成的用于能量回收目的的所产生的气体。
The effect of three operating parameters (peak temperature, pressure, and pyrolysis atmosphere) during the slow pyrolysis of three biomass sources (corn stover, vine shoots, and two-phase olive mill waste) was extensively analyzed. A 2-level full factorial design of experiments was adopted to assess the effect of the above-mentioned factors on the potential stability of biochar as well as the yields of the main pyrolysis products. To evaluate the effect of the biomass feedstock, the design was divided into three blocks (one per biomass feedstock). Results from the statistical analyses indicated that the properties of biochar related to its potential stability were mainly affected by the peak temperature and, to a lesser extent, the biomass feedstock. A significant increase in the yield of produced gas was observed when pressure was raised. This increase in the total gas yield was in part due to a higher release of CO, CH4, and H-2. Using a pyrolysis atmosphere of CO2 (instead of N-2) did not result in any remarkable change in neither the distribution of the pyrolysis products nor the potential stability of biochar. However, when CO2 was used as carrier gas, a significant increase in the yield of CO2 at the expense of produced CO2, was observed. The findings reported herein suggest that processing biomass through pressurized slow pyrolysis under CO2 atmosphere is interesting to simultaneously obtain two valuable products: a biochar with an appropriate carbon sequestration potential, and a produced gas with an appropriate composition for energy recovery purposes.