高温下渣熔融对煤焦-CO<sub>2</sub>气化反应特性的影响

吴加奇; 许慎启; 周志杰; 于广锁; 王辅臣

高温下渣熔融对煤焦-CO₂气化反应特性的影响

华东理工大学煤气化教育部重点实验室, 上海 200237

基金项目: 国家重点基础研究发展规划(973计划, 2004CB217700);国家自然科学基金(20876048);国家高技术研究发展计划 (863计划, 2009AA04Z159)。

详细信息

作者简介:
吴加奇(1987- ), 男, 山东兖州人, 硕士研究生, 主要从事煤气化动力学方面的研究, E-mail:wujiaqi12@163.com。

通讯作者:
周志杰, E-mail:zzj@ecust.edu.cn。

中图分类号: TQ54
计量
- 文章访问数: 1592
- HTML全文浏览量: 14
- PDF下载量: 1044
- 被引次数: 0
出版历程
- 收稿日期: 2011-01-17
- 修回日期: 2011-04-19
- 刊出日期: 2012-01-31

Effects of molten slag on coal gasification reaction with CO₂ at elevated temperature

Key Laboratory of Coal Gasification of Ministry of Education, East China University of Science &|Technology, Shanghai 200237, China

摘要

摘要: 在STA449F3型热天平上采用等温热重法研究了加入不同比例粗渣的煤焦在反应温度900～1380 ℃的气化反应性。利用热重-差示扫描量热法(TG-DSC)对煤焦的热行为进行分析,主要考察了加入不同比例粗渣、反应温度对煤焦反应性的影响。结果表明,煤焦-CO₂反应过程中,气化反应性和碳转化率可根据煤灰熔融流动温度分为相对低温段和高温段。在低温段,加入粗渣增加了煤焦的气化反应性和碳转化率;在高温段,加入粗渣会减小煤焦的碳转化率,并当粗渣加入量超过一定比例时,会降低煤焦的气化反应性。气化初期反应速率可根据粗渣熔融流动温度分为低温区域的化学反应控制和高温区域的扩散控制。
- 等温热重 /
- 煤气化 /
- 气化反应性 /
- 碳转化率 /
- TG-DSC /
- 粗渣
Abstract: The CO₂ gasification reactivity of coal chars blended with different proportions of coarse slag were investigated by using an STA449F3 thermo-balance in the isothermal mode at the temperature range from 900 ℃ to 1 380 ℃. The thermal behavior of the sample was studied using thermo-gravimetric analysis and differential scanning calorimetry (TG-DSC), and the two regions (i.e. the low temperature region and the high temperature region) for the gasification reactivity and carbon conversion of coal chars were defined according to the flow temperature of coal ash fusion. The gasification reactivity and carbon conversion of coal chars with coarse slag added are improved in the low temperature region. But the addition of coarse slag decreases the carbon conversion, and the gasification reactivity of coal chars blended with coarse slag to certain ratio also decreases in the high temperature region. It is indicated that the initial gasification reaction of coal chars is chemically controlled in the low temperature region, and diffusively controlled in the high temperature region.
- isothermal thermo-gravimetric analysis /
- coal gasification /
- gasification reactivity /
- carbon conversion /
- TG-DSC /
- coarse slag

HTML全文

参考文献(22)

范晓雷, 杨帆, 张薇, 周志杰, 于遵宏. 热解过程中煤焦微晶结构变化及其对煤焦气化反应活性的影响[J]. 燃料化学学报, 2006, 34(4):395-399. (FAN Xiao-lei, YAN Fan, ZHANG Wei, ZHOU Zhi-jie, YU Zun-hong. Variation of the crystalline structure of coal char during pyrolysis and its effect on gasification reactivity[J]. Journal of Fuel Chemistry and Technology, 2006, 34(4):395-399.)

张佳丽, 谌伦建, 张如意, 陈江峰. 热解温度与煤焦微结构及分形特征关系研究[J]. 煤炭转化, 2004, 27(2):26-29. (ZHANG Jia-li, CHEN Lun-jian, ZHANG Ru-yi, CHEN Jiang-feng. Study on the relationship between the pyrolysis temperature and the microstructure and fractal dimension of coal or char[J]. Coal Conversion, 2004, 27(2):26-29.)

LIU T-F, FANG Y-T, WANG Y. An experiment investigation into the gasification reactivity of chars prepared at high temperatures[J]. Fuel, 2008, 87(4/5):460-466.

KASAOKA S, SAKARA K, TONG C L J. Kinetic evaluation of reactivity in carbon dioxide gasification of various coal chars and comparison with steam gasification[J]. Fuel, 1983, 62:335-345.

朱子彬, 马智华, 林石英, 平户瑞穗, 二宫善彦. 高温下煤焦气化反应特性:(I)灰分熔融对煤焦气化反应的影响[J]. 化工学报, 1994, 45(2):147-153. (ZHU Zhi-bin, MA Zhi-hua, LIN Shi-ying, PINGHU Rui-shui, ERGONG Shan-yan. The gasification reaction characteristics of coal char at elevated temperature:(I)The effects of molten coal ash on coal char gasification reactivity[J]. Journal of Chemical Industry and Engineering(China), 1994, 45(2):147-153.)

唐黎华, 王建中, 吴勇强, 朱学栋, 蒋德军, 朱子彬. 低灰熔点煤的高温气化反应性能[J]. 华东理工大学学报, 2003, 29(4):341-345. (TANG Li-hua, WANG Jian-zhong, WU Yong-qiang, JIANG De-jun, ZHU Zi-bin. Gasification reactivity of coal with lower ash melting point at high temperature[J]. Journal of East China University of Science and Technology, 2003, 29(4):341-345.)

XU S, ZHOU Z, GAO X, YU G, GONG X. The gasification reactivity of unburned carbon present in gasification slag from entrained-flow gasifier[J]. Fuel Process Technol, 2009, 90(9):1062-1070.

TAKARADA T, TAMAI Y, TOMITA A. Reactivities of 34 coals under steam gasification[J]. Fuel, 1985, 64(10):1438-1442.

杨淑珍. 硬石膏的高温相变和结构研究[J]. 矿物学报, 1998, 18(1):73-79. (YANG Shu-zhen. A study on phase transition at high temperature and structure of anhydride[J]. Acta Mineralogica Sinica, 1998, 18(1):73-79.)

辽宁省地质局中心实验室. 矿物差热分析[M]. 北京:地质出版社, 1975. (The central lab of geologic bureau of Liaoning province. Mineral differential thermal analysis[M]. Beijing:Geology Press, 1975.)

高峰, 赵增立. 煤系高岭土的DTA特征[J]. 燃料化学学报, 1998, 26(1):24-29. (GAO Feng, ZHAO Zeng-li. DTA characteristics of coal series kaolinite[J]. Journal of Fuel Chemistry and Technology, 1998, 26(1):24-29.)

谢克昌. 煤的结构和反应性[M]. 北京:科学出版社, 2002. (XIE Ke-chang. Coal structure and reactivity[M]. Beijing:Science Press, 2002.)

LIU H, LUO C, KATO S, UEMIYA S, KANEKO M, KOJIMA T. Kinetics of CO₂/char gasification at elevated temperatures:Part Ⅰ Experimental results[J]. Fuel Process Technol, 2006, 87(9):775-781.

LIU H, LUO C, TOYATA M, UEMIYA S, KOJIMA T. Kinetics of CO₂/char gasification at elevated temperatures:Part Ⅱ Clarification of mechanism through modeling and char characterization[J]. Fuel Process Technol, 2006, 87(9):769-774.

MAHAJAN O P, WALKER P L Jr. Effect of inorganic matter removal from coals and chars on their surface areas[J]. Fuel, 1979, 58(5):333-337.

PATRICK J W. Porosity in carbons[M]. New York:Halsted Press, John Wiley and Sons, 1995.

RODAVIC L R, WALKER P L Jr, JENKINS R G. Importance of carbon active sites in the gasification of coal chars[J]. Fuel, 1983, 62(7):849-856.

GARCIA X, RODAVIC L R. Gasification reactivity of Chilean coals[J]. Fuel, 1986, 65(2):292-294.

OCHOA J, CASSANELLO M C, BONELLI P R, CUKIERMAN A L. CO₂ gasification of Argentinean coal chars:A kinetic characterization[J]. Fuel, 2001, 74(3):161-176.

BHATIA S K, PELMUTTER D D. A random pore model for fluid-solid reactions:I Isothermal, kinetic control[J]. AIChE J, 1980, 26(3):379-385.

SALATINO P, SENNECA O, MASI S. Gasification of coal char by oxygen and carbon dioxide[J]. Carbon, 1998, 36(4):443-452.

BEAMISH B B, SHAW K J, RODGERS K A, NEWMAN J. Thermogravimetric determination of carbon dioxide reactivity of char from some New Zealand coals and its association with inorganic geochemistry of the parent coal[J]. Fuel Process Technol, 1998, 53(3):243-253.

施引文献

资源附件(0)

访问统计