煤快速热解焦的微观结构对其气化活性的影响

陈路; 周志杰; 刘鑫; 袁帅; 王辅臣

煤快速热解焦的微观结构对其气化活性的影响

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, 2010CB227000); 教育部"长江学者与创新团队发展计划"(IRT0620); 上海市优秀学科带头人资助计划(08XD1401306)。

详细信息

通讯作者:
周志杰, E-mail: zzj@ecust.edu.cn, Tel: 021-64252974。

中图分类号: TQ54
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出版历程
- 收稿日期: 2011-09-13
- 修回日期: 2011-11-26
- 刊出日期: 2012-06-30

Effect of microstructure of rapid pyrolysis char on its gasification reactivity

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

摘要

摘要: 在滴管炉内对中国三种不同煤阶的典型煤种在800~1 400 ℃进行快速热解实验,利用XRD和氮气气体吸附法对所得煤焦进行微晶结构和孔隙特征分析,在热重分析仪上进行CO₂气化反应活性的测定,研究不同热解温度煤焦结构特性与气化活性之间的关系。结果表明,随着热解温度的升高,内蒙古褐煤焦和神府烟煤焦的比表面积在1 200 ℃达到极大值,但气化活性却相对较低;遵义无烟煤焦在800~1 200 ℃气化活性逐渐提高,但比表面积在900 ℃达到极大值,表明煤焦比表面积与气化活性不存在严格关联。煤焦碳微晶结构变化所反映出煤焦石墨化进程与煤焦气化活性随热解温度的变化具有一致的变化趋势,表明快速热解煤焦的碳微晶结构变化对煤焦气化活性的影响更大。
- 滴管炉 /
- 碳微晶结构 /
- 比表面积 /
- 气化活性
Abstract: To investigate the relationship between microstructure of rapid pyrolysis chars under different temperatures and their gasification reactivities, three Chinese typical coals with different ranks were pyrolyzed in a drop-tube furnace at 800~1 400 ℃. The structure of chars obtained was characterized by using XRD (X-ray diffraction) and N₂ gas adsorption method, and the CO₂ gasification reactivity of chars was examined using TGA (thermogravimetric analyzer). The results show that the specific surface area increases with the increasing of pyrolysis temperature and reaches maximum value at 1 200 ℃, while the gasification reactivity of NM lignite and SF bitumite chars lowers relatively. The gasification reactivity of ZY anthracite char increases gradually at 800~1 200 ℃, while the maximum value of specific surface area appears at 900 ℃. It is proved that there is not a good correlation between the specific surface area and the gasification reactivity of chars. However, the change of gasification reactivity of three chars with increasing pyrolysis temperature is in accordance with the development of carbon crystallite structure of chars which reflects the graphitization progress of chars. It is concluded that the change of carbon crystallite structure of chars has a greater influence on the gasification reactivity of chars made by rapid pyrolysis.
- drop-tube furnace /
- carbon crystallite structure /
- specific surface area /
- gasification reactivity

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参考文献(21)

ADSCHIRI T, FURUSAWA T. Relation between CO₂-reactivity of coal char and BET surface area[J]. Fuel, 1986, 65(7): 927-931.

ALVAREZ T, FUERTES A B, PIS J J, EHRBURGER P. Influence of coal oxidation upon char gasification reactivity[J]. Fuel, 1995, 74(5): 729-735.

KAJITANI S, HARA S, MATSUDA H. Gasification rate analysis of coal char with a pressurized drop tube furnace[J]. Fuel, 2002, 81(5): 539-546.

BHATIA S K, PERLMUTTER D D. A random pore model for fluid-solid reactions:1 Isothermal, kinetic control[J]. AIChE J, 1980, 26(3): 379-385.

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

RADOVIC L R, JIANG H, LIZZIO A A. A transient kinetics of char gasification in carbon dioxide and oxygen[J]. Energy Fuels, 1991, 5(1): 68-74.

朱子彬, 马智华, 张成芳. 活性点数对煤焦气化反应的影响:Ⅰ气化活性的评价[J]. 燃料化学学报, 1994, 22(3): 321-328. (ZHU Zi-bin, MA Zhi-hua, ZHANG Cheng-fang. Effect of number of active site on gasification reactivity:ⅠEvaluation of gasification reactivity[J]. Journal of Fuel Chemistry and Technology, 1994, 22(3): 321-328. )

FENG B, BHATIA S K. Variation of the pore structure of coal chars during gasification[J]. Carbon, 2003, 41(3): 507-523.

黄瀛华, 范丽萍, 曹建勤, 任德庆. 煤及煤焦微观结构特征与气化反应性[J]. 燃料化学学报, 1992, 20(8): 293-299. (HUANG Ying-hua, FAN Li-ping, CAO Jian-qin, REN De-qing. The relationship between gaisification reactivity and microstructure characteristics of coal/coal char[J]. Journal of Fuel Chemistry and Technology, 1992, 20(8): 293-299. )

YOUQING W, SHIYONG W, JING G, JINSHENG G. Differences in physical properties and CO₂ gasification reactivity between coal char and petroleum coke[J]. Process Saf Environ Prot, 2009, 87(5): 323-330.

SHARMA A, KADOOKA H, KYOTANI T, TOMITA A. Effect of microstructural changes on gasification reactivity of coal chars during low temperature gasification[J]. Energy Fuels, 2002, 16(1): 54-61.

LU L, KONG C, SAHAJWALLA V, HARRIS D. Char structural ordering during pyrolysis and combustion and its influence on char reactivity[J]. Fuel, 2002, 81(9): 1215-1225.

FENG B, BHATIA S K, BARRY J C. Variation of the crystalline structure of coal char during gasification[J]. Energy Fuels, 2003, 17(3): 744-754.

范晓雷, 杨帆, 张薇, 周志杰, 王辅臣, 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): 395-398. (FAN Xiao-lei, YANG Fan, ZHANG Wei, ZHOU Zhi-jie, WANG Fu-chen, 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): 395-398. )

BADZIOCH S, HAWKSLEY P G W. Kinetics of thermal decomposition of pulverized coal particles[J]. Ind Eng Chem Process Des Dev, 1970, 9(4): 521-530.

张军, 汉春利, 王夕华, 徐益谦. 煤显微组分富集物燃烧特性滴管炉试验研究[J]. 燃料科学与技术, 2002, 8(5): 403-406. (ZHANG Jun, HAN Chun-li, WANG Xi-hua, XU Yi-qian. Experimental study of drop-tube furnace on combustion characteristics of maceral concentrates[J]. Journal of Combustion Science and Technology, 2002, 8(5): 403-406. )

SPROUSE K M, SCHUMAN M D. Predicting lignite devolatilization with the multiple parallel and two competing reaction models[J]. Combust Flame, 1981, 43:265-272.

TAKAYUKI K, SILVESTON P L. Reactivities of 34 coals under steam gasification [J]. Fuel, 1985, 64(10): 1438-1442.

朱子彬, 唐黎华, 吴勇强, 朱学栋. 高温下制焦温度对煤焦气化活性的影响[J]. 燃料化学学报, 2002, 30(1): 16-20. (ZHU Zi-bin, TANG Li-hua, WU Yong-qiang, ZHU Xue-dong. Effect of char making temperature on char gasification activity in higher temperature[J]. Journal of Fuel Chemistry and Technology, 2002, 30(1): 16-20. )

LU L, SAHAJWALLA V, HARRIS D. Characteristics of chars prepared from various pulverized coals at different temperatures using drop-tube furnace[J]. Energy Fuels, 2000, 14(4): 869-876.

常海州, 蔡雪梅, 李改仙, 白官, 吕秀清. 不同还原程度煤显微组分堆垛结构表征[J]. 山西大学学报(自然科学版), 2008, 31(2): 223-227. (CHANG Hai-zhoug, CAI Xue-mei, LI Gai-xian, BAI Guan, LV Xiu-qing. Characterization for the stacking structure of coal macerals with different type reductivity[J]. Journal of Shanxi University(Nat. Sci. Ed), 2008, 31(2): 223-227.)

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