H<sub>2</sub>气氛下褐煤快速热解过程中CH<sub>4</sub>逸出规律的分析

高松平; 王建飞; 赵建涛; 王志青; 房倚天; 黄戒介

H₂气氛下褐煤快速热解过程中CH₄逸出规律的分析

1.
太原工业学院, 山西太原 030008;
2.
中国科学院山西煤炭化学研究所, 山西太原 030001;
3.
中国科学院大学, 北京 100049

基金项目: 国家自然科学基金(21106173);中国科学院战略性先导科技专项(XDA0705100); 中国科学院山西煤炭化学研究所青年人才基金(2011SQNRC01); 山西省高校科技开发项目(20101135)。

详细信息

通讯作者:
房倚天, 研究员, Tel/Fax: 0351-2021137, E-mail: fyt@sxicc.ac.cn。

中图分类号: TQ530.2
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出版历程
- 收稿日期: 2014-07-06
- 刊出日期: 2015-05-30

Analysis of CH₄ evolution in fast pyrolysis of lignite under H₂ atmosphere

1.
Taiyuan Institute of Technology, Taiyuan 030008, China;
2.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 在带有输送煤样的管式反应器上进行了霍林河褐煤加压快速氢解实验,分析了H₂对煤/半焦的化学键断裂和对CH₄生成规律的影响。在加压快速氢解条件下,CH₄产率随着热解温度升高、压力的增大而增大;在50% H₂气氛下,操作压力为1.0 MPa、温度为900 ℃时,CH₄产率为8.08%,达到最大,较N₂气氛下的提高了72.5%。H₂或H·自由基诱发了芳环的开裂、侧链、脂肪链和醚键的断裂,促进了煤热解。CH₄产率的增加主要是由于外部供H的结果;热解温度低于700 ℃时,H₂对煤结构中活性基团的作用促进了煤热解,导致了CH₄产率的增加;而热解温度高于700 ℃后,煤/半焦加氢气化促进了CH₄产率的增加。
- H₂气氛 /
- 加压快速热解 /
- CH₄逸出规律 /
- 化学键断裂
Abstract: The fast hydropyrolysis of Huolinhe lignite were carried out under pressure in a tubular reactor with a transporter for coal samples. The effect of H₂ on CH₄ evolution and crack of chemical bonds were analyzed. Under pressure fast hydropyrolysis conditions, CH₄ yield was higher under H₂ atmosphere than that under N₂ atmosphere, and increased with increasing temperature and pressure. Compared with N₂ atmosphere, the yield of CH₄ increased by 72.5% under 50% H₂ atmosphere at 900 ℃ and 1.0 MPa. H₂ or H· free radical induced the cracks of aromatic rings, side chains, ether linkages and aliphatic chains in the char, which could promote the coal pyrolysis. The increased yield of CH₄ was mainly due to the external donor H. Below 700 ℃, the action of H₂ with active groups in coal structure affected the pyrolysis of coal; above 700 ℃, hydrogenation of char promoted coal pyrolysis, leading to an increase in CH₄ yield.
- H₂ atmosphere /
- in fast pyrolysis under pressure /
- the CH₄ evolution /
- the crack of the chemical bonds

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