CO<sub>2</sub>对褐煤热解行为的影响

高松平; 赵建涛; 王志青; 王建飞; 房倚天; 黄戒介

CO₂对褐煤热解行为的影响

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

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)。

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
计量
- 文章访问数: 1650
- HTML全文浏览量: 14
- PDF下载量: 903
- 被引次数: 0
出版历程
- 收稿日期: 2012-10-15
- 修回日期: 2012-12-26
- 刊出日期: 2013-03-30

Effect of CO₂ on pyrolysis behaviors of lignite

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

摘要

摘要: 利用热天平和快速升温固定床进行了CO₂气氛下褐煤热解特性的研究,考察了CO₂对半焦的产率和气体产物分布的影响。通过对半焦的比表面积、孔结构、官能团和元素含量的分析,确定了CO₂对煤热解过程的影响机制。CO₂对新生半焦的气化反应破坏了含氢的半焦结构,一方面,促进了羟基、甲基、亚甲基等基团的断裂和苯环的开裂;另一方面,减弱H与其依附本体的结合,增加了氢的流动性,引发了更多的氢自由基生成。这些氢自由基与煤大分子断裂生成的碎片自由基结合生成更多的挥发分,使半焦有较大的比表面积、孔容和开孔率。CO₂的引入促进了煤的热解和挥发分的生成,增大了H₂、CO、CH₄和C₂H₆等小分子烃类物质逸出,降低了半焦的产率。
- CO₂气氛 /
- 热解行为 /
- 半焦性质
Abstract: The pyrolysis of Huolinhe lignite under CO₂ atmosphere was carried out in a thermobalance and a fast heating-up fixed bed reactor. The distribution of gases, char yield and its property such as element, surface structure, FT-IR spectra were analyzed. By this, the effect of CO₂ on the pyrolysis behaviors was studied. The results show that CO₂ gasification of the nascent char, which destroys the hydrogen-containing char structure, not only promotes cracking of benzene ring and fracture of hydroxyl, methyl and methylene groups etc., but also weakens the interaction between H and char matrix and increases the H fluidity, leading to the increase in the generation of H radicals. These H radicals can combine with other free radical fragments generated from fracture of the coal macromolecules to produce more volatiles. This will produce the char with a high specific surface and high pore volume and porosity. The introduction of CO₂ promotes the coal pyrolysis and generation of volatile, resulting in decrease in char yield and increase in the evolution amount of H₂, CO, CH₄ and other small molecules hydrocarbons.
- CO₂ atmosphere /
- pyrolysis behaviors /
- char property

HTML全文

参考文献(17)

王鹏, 文芳, 步学朋, 刘玉华, 边文, 邓一英. 煤热解特性研究[J]. 煤炭转化, 2005, 28(1): 8-13. (WANG Peng, WEN Fang, BU Xue-peng, LIU Yu-hua, BIAN Wen, DENG Yi-ying. Study on the pyrolysis characteristics of coal[J]. Coal Conversion, 2005, 28(1): 8-13.)

DUAN L, ZHAO C, ZHOU W, QU C, CHEN X. Investigation on coal pyrolysis in CO₂ atmosphere [J]. Energy Fuels, 2009, 23(7): 3826-3830.

MESSENBÖCK R C, DUGWELL D R, KANDIYOTI R. Coal gasification in CO₂ and steam: Development of a steam injection facility for high-pressure wire-mesh reactors[J]. Energy Fuels, 1999, 13(1): 122-129.

JAMIL K, HAYASHI J I, LI C Z. Pyrolysis of a Victorian brown coal and gasication of nascent char in CO₂ atmosphere in a wire-mesh reactor[J]. Fuel, 2004, 83(7/8): 833-843.

NAREDI P, PISUPATI S. Effect of CO₂ during coal pyrolysis and char burnout in oxy-coal combustion[J]. Energy Fuels, 2011, 25(6): 2454-2459.

MESSENBÖCK R, DUGWELL D R, KANDIYOTI R. CO₂ and steam gasication in a high-pressure wire-mesh reactor: The reactivity of Daw Mill coal and combustion reactivity of its chars[J]. Fuel, 1999, 78(7): 781-793.

石金明, 向军, 张军营, 赵清森, 胡松, 孙路石, 苏胜. 兖州煤热演化过程中表面官能团结构研究[J]. 燃烧科学与技术, 2010, 16(3): 247-251. (SHI Jin-ming, XIANG Jun, ZHANG Jun-ying, ZHAO Qing-sen, HU Song, SUN Lu-shi, SHU Sheng. Surface functional groups structure during Yanzhou coal thermal maturity[J]. Journal of Combustion Science and Technology, 2010, 16(3): 247-251.)

冯杰, 李文英, 谢克昌. 傅立叶红外光谱法对煤结构的研究[J]. 中国矿业大学学报, 2002, 31(5): 362-363. (FENG Jie, LI Wen-ying, XIE Ke-chang. Research on coal structure using FT-IR[J]. Journal of China University of Mining & Technology, 2002, 31(5): 362-363.)

张妮. 不同变质程度煤热解生成甲烷特征及反应机制. 太原: 太原理工大学, 2004. (ZHANG Ni. Reaction mechanisms and characteristics of methane generation during pyrolysis of different rank coals. Taiyuan: Taiyuan University of Technology, 2004.)

MISIRLIO ?LU Z, CANEL M, SINA ? A. Hydrogasication of chars under high pressures[J]. Energy Convers Manage, 2007, 48(1): 52-58.

LEE C W, JENKINS R G, SCHOBET H H. Mechanisms and kinetics of rapid, elevated pressure pyrolysis of Illinois No. 6 bituminous coal[J]. Energy Fuels, 1991, 5(4): 547-555.

CHANG L, XIE Z, XIE K-C, PRATT K C, HAYASHI J-I, CHIBA T, LI C-Z. Formation of NOx precursors during the pyrolysis of coal and biomass: Part VI effects of gas atmosphere on the formation of NH₃ and HCN[J]. Fuel, 2003, 82(10): 1159-1166.

丘纪华. 煤粉在热分解过程中表面积和孔隙结构的变化 [J]. 燃料化学学报, 1994, 22(3): 316-320. (QIU Ji-hua. Variation of surface area and pore structure of pulverized coal during pyrolysis[J]. Journal of Fuel Chemistry and Technology, 1994, 22(3): 316-320.)

崔丽杰, 姚建中, 林伟刚, 张峥. 喷动-载流床中温度对霍林河褐煤快速热解产物的影响[J]. 现代化工, 2003, 23(10): 28-32. (CUI Li-jie, YAO Jian-zhong, LIN Wei-gang, ZNAG Zheng. Effect of temperature on products of flash pyrolysis of lignite in a spouted-entrained bed[J]. Modern Chemical Industry, 2003, 23(10): 28-32.)

PETER J J, TROMP F K, JACOB A M. Characterization of coal pyrolysis by means of differential scanning calorimeters: 2 Quantitative heat effects in a H₂ and in a CO₂ atmosphere[J]. Fuel Process Technol, 1989, 23(1): 63-74.

白宗庆, 陈皓侃, 李文, 李保庆. 热重-质谱联用研究焦炭在甲烷气氛下的热行为[J]. 燃料化学学报, 2005, 33(4): 426-430. (BAI Zong-qing, CHEN Hao-kan, LI Wen, LI Bao-qing. Study on the thermal performance of metallurgical coke under methane by TG-MS[J]. Journal of Fuel Chemistry and Technology, 2005, 33(4): 426-430.)

朱学栋, 朱子杉, 唐黎华, 张成芳. 煤的热解研究:Ⅰ气氛和温度对热解的影响[J]. 华东理工大学学报, 1998, 24(1): 37-41. (ZHU Xue-dong, ZHU Zi-shan, TANG Li-hua, ZHANG Cheng-fang. Fundamental study on the pyrolysis of coals: I Effect of atmosphere and temperature on pyrolysis[J]. Journal of East China University of Science and Technology, 1998, 24(1): 37-41.)

施引文献

资源附件(0)

访问统计