过程参数对纤维素水热碳化的影响

doi:10.11949/j.issn.0438-1157.20150793

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 4980-4987.DOI: 10.11949/j.issn.0438-1157.20150793

过程参数对纤维素水热碳化的影响

刘娟, 池涌, 舒迪

浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江杭州 310027

收稿日期:2015-06-02 修回日期:2015-07-16 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 池涌
基金资助:
2015-06-02收到初稿,2015-07-16收到修改稿。联系人:池涌。第一作者:刘娟(1990-),女,硕士研究生。基金项目:国家重点基础研究发展计划项目(2011CB201506);高等学校学科创新引智计划(B08026);国家自然科学基金项目(51276168)。

Effects of process parameters on hydrothermal carbonization of cellulose

LIU Juan, CHI Yong, SHU Di

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2015-06-02 Revised:2015-07-16 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Basic Research Program of China (2011CB201506), the Program of Introducing Talents of Discipline to University (B08026) and the National Natural Science Foundation of China (51276168).

摘要/Abstract

摘要：

生物质废弃物是当今世界上的第四大能源,传统的焚烧处理方式不仅会污染环境,还会浪费能源。水热碳化是一种高效的废弃生物质资源化技术。考察了反应温度和停留时间对纤维素水热碳化碳分布的影响,并对碳化物的物理化学特性、微观结构进行了研究,以及从反应机理角度进行解释。结果表明,原料中的碳大部分都保留在了碳化物中,占71%～75%,其余部分被转移至液相和气相。随着温度和时间的增大,碳化物的产率降低,热值升高,O/C原子比降低。SEM显示当温度达到220℃时,碳化物表面开始形成微球结构,且随着温度和时间的增大,微球结构均一性、分散度越来越好。FTIR表明碳化物表面生成羟基和羰基等官能团,水热碳化过程中会发生脱水和芳香化反应。

关键词: 纤维素, 水热碳化, 碳分布, 碳化物, 表征

Abstract:

Biomass is the fourth largest source of energy and conventional incineration will not only pollute the environment, but also is a waste of energy. Hydrothermal carbonization (HTC) is a novel biomass conversion technology, yielding carbonaceous products (HTC char) favorable for wider range of applications. The impact of temperature and reaction time on hydrothermal carbonization of microcrystalline cellulose and carbon distribution was studied, and physical, chemical, thermal and structural characteristics of HTC char also investigated. The results show that during hydrothermal carbonization of microcrystalline cellulose a significant fraction of initially present carbon, about 71%-75%, is stayed in HTC char, while only a small fraction of the carbon is transferred the liquid and gas-phases. As the temperature and reaction time increase, the HTC char yield and O/C atom ratio decrease, and its heat value increases. SEM images show that HTC char consists of aggregates of microspheres. FTIR spectra indicate that dehydration and aromatization processes take place during hydrothermal carbonization and HTC char possesses hydroxyl groups and carbonyl groups.

Key words: cellulose, hydrothermal carbonization, carbon distribution, HTC char, characterization

中图分类号:

X705

刘娟, 池涌, 舒迪. 过程参数对纤维素水热碳化的影响[J]. 化工学报, 2015, 66(12): 4980-4987.

LIU Juan, CHI Yong, SHU Di. Effects of process parameters on hydrothermal carbonization of cellulose[J]. CIESC Journal, 2015, 66(12): 4980-4987.

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过程参数对纤维素水热碳化的影响

Effects of process parameters on hydrothermal carbonization of cellulose

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