烟煤与生物质快速共热解产物特性分析

王建飞; 赵建涛; 李风海; 王志青; 黄戒介; 房倚天

烟煤与生物质快速共热解产物特性分析

1.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001;
2.
中国科学院大学, 北京 100049;
3.
菏泽学院化学化工系, 山东菏泽 274015

基金项目: 中国科学院战略性先导科技专项(XDA07050100);创新2020项目(Y1SC5A1111);青年基金(2013021007-2)。

详细信息

通讯作者:
赵建涛,Tel:0351-2021137,E-mail:zhaojt@sxicc.ac.cn。

中图分类号: TQ522.1
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出版历程
- 收稿日期: 2014-11-27
- 修回日期: 2015-02-10
- 刊出日期: 2015-06-30

Product characteristics for fast co-pyrolysis of bituminous coal and biomass

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China;
3.
Department of Chemistry and Chemical Engineering, Heze University, Heze 274015, China

摘要

摘要: 研究了烟煤(YL)分别与富含半纤维素的玉米芯(CB)和富含木质素的松木屑(SD)快速共热解产物产率和气体组成的变化规律。结果表明,烟煤与生物质共热解组分互相作用,造成共热解气、液、固相产率和气体组成的明显变化,且与生物质种类有关。相对于独立热解过程,玉米芯丰富的半纤维素造成热解水蒸气和CO₂浓度较高,且玉米芯中富含的K元素挥发迁移至煤焦表面,对热解半焦与水蒸气、CO₂的气化反应起到催化作用,反应生成的H₂和富氢组分易与热解生成的自由基结合,抑制自由基之间的缩聚反应,使得共热解气体和液体产率增加,而半焦产率减小。烟煤/松木屑共热解过程中,松木屑中富含的Ca元素在煤焦表面迁移,促进了松木屑热解液体在半焦表面裂解反应,生成CO₂、CO和富氢自由基等轻质组分,造成共热解半焦和液体产率降低而气体产率增加。热解产物半焦、焦油、水蒸气、CO₂之间的气化和裂解反应均产生富氢的次生组分,从而提高了共热解气体中CO和烃类气体产率,降低了H₂产率。
- 煤 /
- 生物质 /
- 快速热解 /
- 产率
Abstract: The product yields and gas composition were examined for fast co-pyrolysis of bituminous coal with either hemicelluloses-rich corncob or lignin-rich pine sawdust. The results indicate that the interactions among pyrolysis products cause an obvious difference in the yields and gas composition during the co-pyrolysis processes. As compared with pyrolysis of individual fuels, the co-pyrolysis of corncob can generate more CO₂ and H₂O due to its high content of hemicelluloses. K in biomass is easy to evaporate and transfers to the surface of coal char. The catalytic effect of K can promote the gasification reactions of coal char with CO₂ and H₂O to produce activated H and hydrogen-rich components, which can couple with radicals to inhibit polycondensation reactions between macro radicals. As a result, the co-pyrolysis increases the gas and liquid yields and decreases the char yield. For co-pyrolysis of bituminous coal and pine sawdust, Ca in pine sawdust can transfer to the surface of coal char to promote the cracking reactions of tar liquids and generate more CO₂, CO and hydrogen-rich radicals. The co-pyrolysis reduces the char and liquid yields and raises gas yield. The gasification and cracking reactions of pyrolysis products (char, liquids and gases) produce more secondary hydrogen-rich components to raise hydrocarbons and CO content in the gaseous products.
- bituminous coal /
- biomass /
- fast pyrolysis /
- product yield

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