Preparation and characterization of hydrochar from waste eucalyptus bark by hydrothermal carbonization
Preparation and characterization of hydrochar from waste eucalyptus bark by hydrothermal carbonization
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DOI：
10.1016/j.energy.2015.12.123
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发表时间：
2016-02-15
期刊：
影响因子：
9
通讯作者：
Xue, Gang
中科院分区：
文献类型：
--
作者：
Gao, Pin;Zhou, Yiyuan;Xue, Gang
HTC（水热碳化）是一种技术上有吸引力的生物质热转化工艺，可在温和条件下生产固体碳质产品。 HTC 使用 EB（桉树皮）作为生产水炭的原料。通过在 220-300 摄氏度范围内改变碳化温度和在 2-10 小时范围内改变停留时间来检查工艺条件对水炭产率和物理化学性质的影响。随着温度的升高，氢炭收率略有下降，从220℃时的46.4%下降到300℃时的40.0%。O/C和H/C原子比分别从1.69和0.80下降到0.83和0.23，这主要与脱水、脱羧和脱甲烷反应有关。含氧官能团随着温度升高而减少。氢炭的HHV（高热值）范围为20.2-29.2 MJ/kg。热重分析表明，在超过220℃的温度下获得的水炭产品表现出几乎相同的热行为。相比之下，停留时间对水炭的产率、理化性质和热行为的影响微乎其微。 (C) 2016 Elsevier Ltd. 保留所有权利。
HTC (hydrothermal carbonization) is a technically-attractive thermal conversion process for biomass to produce solid carbonaceous products at mild conditions. EB (eucalyptus bark) was used as a feedstock for producing hydrochar by HTC. Effect of process conditions on the yield and physicochemical properties of hydrochar was examined by varying carbonization temperature over the range of 220-300 degrees C and varying residence time over the range of 2-10 h. With increase in temperature, the hydrochar yield decreased slightly from 46.4% at 220 degrees C to 40.0% at 300 degrees C. The O/C and H/C atomic ratios reduced from 1.69 and 0.80 to 0.83 and 0.23, respectively, which was mostly related to dehydration, decarboxylation and demethanation reactions. The oxygen containing functional groups decreased with increasing temperature. HHV (higher heating value) of hydrochar was in the range of 20.2-29.2 MJ/kg. Thermogravimetric analysis showed that hydrochar products obtained at temperature over 220 degrees C exhibited almost the same thermal behaviors. In comparison, the influence of residence time on the yield, physicochemical properties and thermal behavior of hydrochar was marginal. (C) 2016 Elsevier Ltd. All rights reserved.