Investigation on in/ex-situ coal char gasification kinetics in a micro fluidized bed reactor

WANG Fang; ZENG Xi; WANG Yong-gang; YU Jian; XU Guang-wen

Volume 43 Issue 04

Apr. 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(04): 393-401

WANG Fang, ZENG Xi, WANG Yong-gang, YU Jian, XU Guang-wen. Investigation on in/ex-situ coal char gasification kinetics in a micro fluidized bed reactor[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 393-401.

Citation:

WANG Fang, ZENG Xi, WANG Yong-gang, YU Jian, XU Guang-wen. Investigation on in/ex-situ coal char gasification kinetics in a micro fluidized bed reactor[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 393-401.

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Investigation on in/ex-situ coal char gasification kinetics in a micro fluidized bed reactor

1.
School of Chemical and Environmental Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China;
2.
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 2014-11-20
Publish Date: 2015-04-30

Abstract

Abstract

In-situ char and ex-situ char gasification characteristic was studied by using a newly developed micro fluidized bed reaction analyzer (MFBRA) and the reaction kinetics parameters were obtained. The in-situ char gasification proceeds using the same atmosphere, temperature and reactor in the gasification following the pyrolysis; the ex-situ char 1 gasification is defined as coal pyrolysis in Ar atmosphere and then gasification at hot state in the same reactor; and ex-situ char 2 gasification reaction is defined as coal pyrolysis in Ar atmosphere and then gasification after thermal annealing. By analyzing the three kinds of char, it can be seen that in-situ char has the largest specific surface area, lowest graphitization degree, and strongest sorption ability for CO₂. Under the minimized limitations of heat and mass transfer, in-situ char gasification has the highest reaction rate, and lowest reaction energy. The study also proves the reliability of MFBRA for in-situ char gasification reaction.
- MFBRA,
- in-situ gasification,
- ex-situ gasification,
- reaction kinetics,
- isothermal reaction

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References(31)

References

XIAO R, ZHANG M Y, JIN B S. High-temperature air/steam-blown gasification of coal in a pressurized spout-fluid bed[J]. Energy Fuels, 2006, 20(2):715-720.

任海君, 张永奇, 房倚天, 黄戒介, 汪洋. 褐煤焦中的矿物质对气化动力学的影响[J]. 化学工程, 2010, 38(10):132-135. (REN Hai-jun, ZHANG Yong-qi, FANG Yi-tian, HUANG Jie-jie, WANG Yang. Effect of minerals in lignite char on kinetics of steam gasification[J]. Chem Eng, 2010, 38(10):132-135.)

周静, 周志杰, 龚欣, 于遵宏. 煤焦二氧化碳气化动力学研究(I)等温热重法[J]. 煤炭转化, 2002, 25(4):66-69. (ZHOU Jing, ZHOU Zhi-Jie, GONG Xin, YU Zun-hong. Study of char-CO₂ gasification:(I) By isothermal thermogravimetry[J]. Coal Convers, 2002, 25(4):66-69.)

POOYA L, ZAINAL A Z, ABSUA R M, MAEDEH M. CO₂ gasification reactivity of biomass char:Catalytic influence of alkali, alkaline earth and transition metal salts[J]. Bioresour Technol, 2013, 144:288-295.

SUPAPORN S, KUNCHANA B, BOONYARACH K. CO₂ gasification of Thai coal chars:Kinetics and reactivity studies[J]. Korean J Chem Eng, 2010, 39(5):46-53.

HYO J J, SANG S P, JUNGHO H. Co-gasification of coal-biomass blended char with CO₂ at temperatures of 900-1 100 ℃[J]. Fuel, 2014, 116:465-470.

刘殊远, 汪印, 武荣成, 曾玺, 许光文. 热态半焦和冷态半焦催化裂解煤焦油研究[J]. 燃料化学学报, 2013, 41(9):1041-1049. (LIU Shu-yuan, WANG Yin, WU Rong-cheng, ZENG Xi, XU Guang-wen. Research on coal tar catalytic cracking over hot in-situ chars[J]. J Fuel Chem Technol, 2013, 41(9):1041-1049.)

ZENG X, WANG Y, YU J. Coal pyrolysis in a fluidized bed for adapting to a two-stage gasification process[J]. Energy Fuels, 2011, 25(3):1092-1098.

向银花, 王洋, 张建民, 张守玉, 房倚天, 董众兵. 部分气化焦的水蒸气气化动力学[J]. 化工学报, 2003, 54(3):368-373. (XIANG Yin-hua, WANG Yang, ZHANG Jian-min, ZHANG Shou-yu, FANG Yi-tian, DONG Zhong-bing. Kinetic on steam gasification of partially gasified char[J]. CIESC J, 2003, 54(3):368-373.)

杨小风, 周静, 龚欣, 于遵宏. 煤焦水蒸气气化特性及动力学研究[J]. 煤炭转化, 2003, 26(4):46-50. (YANGXiao-feng, ZHOU Jing, GONG Xin, YU Zun-hong. Kinetic and characteristic study of char-H₂O gasification by isothermal thermogravimetry[J]. Coal Convers, 2003, 26(4):46-50.)

张林仙, 黄戒介, 房倚天, 王洋. 中国无烟煤焦气化活性的研究-水蒸气与二氧化碳气化活性的比较[J]. 燃料化学学报, 2006, 34(3):265-269. (ZAHNG Lin-xian, HUANG Jie-jie, FANG Yi-tian, WANG Yang. Study on reactivity of Chinese anthracite chars gasification:Comparison of reactivity between steam and CO₂ gasification[J]. J Fuel Chem Technol, 2006, 34(3):265-269.)

YU J, YUE J R, XU G W, SUN L X. Kinetics and mechanism of solid reactions in a micro fluidized bed reactor[J]. AIChE J, 2010, 56(11):2905-2912.

YU J, ZENG X, ZHANG J W, ZHONG M, ZHANG G Y, WANG Y, XU G W. Isothermal differential characteristics of gas-solid reaction in micro-fluidized bed reactor[J]. Fuel, 2013, 103:29-36.

YU J, ZENG X, ZHANG J W, ZHONG M, ZHANG G Y, WANG Y, XU G W. Kinetics and mechanism of direct reaction between CO₂ and Ca(OH)₂ in micro fluidized bed[J]. Sci Techonl, 2013, 47(13):7514-7520.

ZENG X, WANG W, WANG Y G, YU J, XU G W. Characterization of char gasification in a micro fluidized bed reaction analyzer[J]. Energy Fuels, 2014, 28(3):1838-1845.

ZHAO Z G, ZHANG J W, ZHANG G Y, ZENG X, ZHAO F X, XU G W. Pilot study on jetting pre-oxidation fluidized bed gasification adapting to caking coal[J]. Appl Energy, 2013, 110:276-284.

季颖, 曾玺, 余剑, 岳君容, 李奡明, 许光文. 微型流化床反应分析仪中煤半焦水蒸气气化反应特性[J]. 化工学报, 2014, 65(9):3447-3456. (JI Ying, ZENG Xi, YU Jian, YUE Jun-rong, LI Ao-ming, XU Guang-wen. Steam gasification characteristics of coal char in micro-fluidized bed reaction analyzer[J]. CIESC J, 2014, 65(9):3447-3456.)

MOLINA A, MONTAYO A, MONDRAGN F. CO₂ strong chemisorption as an estimate of coal char gasification reactivity[J]. Fuel, 1999, 78(8):971-977.

XU K, HU S, SU S, XU C F, SUN L S, CHAO S, JIANG L, XIANG J. Study on char surface active sites and their relationship to gasification reactivity[J]. Energy Fuels, 2012, 27(1):118-125.

刘忠锁, 汪琦, 邹宗树, 谭广雷. 非等温热重分析研究碳气化动力学[J]. 材料与冶金学报, 2010, 9(1):68-71. (LIU Zhong-suo, WANG qi, ZOU Zong-shu, TAN Guang-lei. Study on carbon gasification kinetics using non-isothermal thermogravimetric analysis[J]. J Mater Metall, 2010, 9(1):68-71.)

GUIZANI C, ESCUDEROSANZ F J, SALVADOR S. Effects of CO₂ on biomass fast pyrolysis:Reaction rate, gas yields and char reactive properties[J]. Fuel, 2014, 116:310-320.

QIAN L, ZHAO Y J, SUN S Z, CHEN H W, CHEN H, WANG D. Chemical/physical properties of char during devolatilization in inert and reducing conditions[J]. Fuel Process Technol, 2014, 118:327-334.

SENNECA O, SALATINO P, MASI S. Heat treatment-induced loss of combustion reactivity of a coalchar:The effect of exposure to oxygen[J]. Exp Therm Fluid Sci, 2004, 28(7):735-741.

李庆钊, 林柏泉, 赵长遂, 武卫芳. 基于傅里叶红外光谱的高温煤焦表面化学结构特性分析[J]. 中国电机工程学报, 2011, 31(32):46-52. (LI Qing-zhao, LIN Bai-quan, ZHAO Chang-sui, WU Wei-fang. Chemical structure analysis of coal char surface based on Fourier-transform infrared spectrometer[J]. Proc CSEE, 2011, 31(32):46-52.)

WATANABE H, SHIMOMURA K, OKAZAKI K. Effect of high CO₂ concentration on char formation through mineral reaction during biomass pyrolysis[J]. Proc Combust Ins, 2013, 34(2):2339-2345.

罗陨飞, 李文华. 中低变质程度煤显微组分大分子结构的XRD研究[J]. 煤炭学报, 2004, 29(31):338-341. (LUO Yun-fei, LI Wen-hua. X-ray diffraction analysis on the different macerals of several low-to-medium metamorpic grade coals[J]. J China Coal Soc, 2004, 29(31):338-341.)

王丽, 张蓬洲. 煤的RXD的结构分析[J]. 煤炭转化, 1997, 20(1):68-71. (WANG Li, ZHANG Peng-zhou. XRD study of coal structure[J]. Coal Convers, 1997, 20(1):68-71.)

MIURA K, HANSHIMOTO K, SILVESTON P L. Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity[J]. Fuel, 1989, 68(11):1461-1475.

PENG F F, LEE I C, YANG R Y K. Reactivities of in situ and ex situ coal chars during gasification in steam at 1 000-1 400 ℃[J]. Fuel Process Technol, 1995, 41(3):233-251.

SADHUKHAN A K, GUPTA P, SAHA R K. Analysis of the dynamics of coal char combustion with Ignition and extinction phenomena:Shrinking core model[J]. Int J Chem Kinet, 2008, 40(9):569-582.

ZHANG L X, HUANG J J, FANG Y T, WANG Y. Gasification reactivity and kinetics of typical chinese anthracite chars with steam and CO₂[J]. Energy Fuels, 2006, 20(3):1201-1210.

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