School of Energy and Environment, Southeast University, Nanjing 210096, China.
Bioresour Technol. 2011 Mar;102(5):4258-64. doi: 10.1016/j.biortech.2010.12.075. Epub 2010 Dec 23.
Biomass fast pyrolysis is one of the most promising technologies for biomass utilization. In order to increase its economic potential, pyrolysis gas is usually recycled to serve as carrier gas. In this study, biomass fast pyrolysis was carried out in a fluidized bed reactor using various main pyrolysis gas components, namely N(2), CO(2), CO, CH(4) and H(2), as carrier gases. The atmosphere effects on product yields and oil fraction compositions were investigated. Results show that CO atmosphere gave the lowest liquid yield (49.6%) compared to highest 58.7% obtained with CH(4). CO and H(2) atmospheres converted more oxygen into CO(2) and H(2)O, respectively. GC/MS analysis of the liquid products shows that CO and CO(2) atmospheres produced less methoxy-containing compounds and more monofunctional phenols. The higher heating value of the obtained bio-oil under N(2) atmosphere is only 17.8 MJ/kg, while that under CO and H(2) atmospheres increased to 23.7 and 24.4 MJ/kg, respectively.
生物质快速热解是生物质利用最有前途的技术之一。为了提高其经济潜力，通常将热解气回收用作载气。在这项研究中，使用各种主要热解气成分，即 N(2)、CO(2)、CO、CH(4)和 H(2)，在流化床反应器中进行生物质快速热解，作为载气。研究了气氛对产物收率和油馏分组成的影响。结果表明，与 CH(4) 获得的最高 58.7%相比，CO 气氛下液体收率最低（49.6%）。CO 和 H(2) 气氛分别将更多的氧转化为 CO(2) 和 H(2)O。液体产物的 GC/MS 分析表明，CO 和 CO(2) 气氛产生的含甲氧基化合物较少，单官能酚较多。在 N(2) 气氛下获得的生物油的高热值仅为 17.8 MJ/kg，而在 CO 和 H(2) 气氛下分别增加到 23.7 和 24.4 MJ/kg。
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