Gasification reactivity of char from corncob hydrolysis residue
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摘要: 利用热重分析仪研究了玉米芯及其酸水解残渣热解焦的气化反应性,重点考察了热解温度、升温速率、气化温度和气化介质(CO2、H2O)对残渣热解焦气化反应性的影响,并借助SEM观测了热解焦的表观形貌。结果表明,残渣热解焦的气化反应性较玉米芯热解焦有所下降;在热解温度550~850 ℃,残渣热解焦的气化反应性随热解温度提高而降低,在热解升温速率0.1 K/s下制取的热解焦,其气化反应性低于15.0 K/s下的热解焦;在气化温度850~950 ℃,提高气化反应温度和使用水蒸气作为气化介质能显著提高残渣热解焦的气化反应性;采用混合反应模型计算了残渣热解焦的气化反应动力学参数。Abstract: The gasification reactivities of chars generated from the pyrolysis of corncob and its acid hydrolysis residue (AHR) were investigated by using a thermal gravimetric analyzer (TGA). The effects of pyrolysis temperature, heating rate, gasification temperature and gasification agent (CO2 and H2O) on the gasification reactivities were examined, and the char morphology was characterized by means of scanning electron microscopy (SEM). The results show that the AHR char performs lower gasification reactivity than the corncob char does in both steam and carbon dioxide. The gasification reactivity of AHR char decreases with increasing the pyrolysis temperature from 550 to 850 ℃, but increases when the pyrolysis heating rate increases from 0.1 to 15.0 K/s. The gasification reactivity of AHR increases with increasing temperature, and the steam gasification reactivity of AHR char is higher than the CO2 gasification reactivity at gasification temperatures between 850 and 950 ℃. The gasification kinetic parameters based on a mixed reaction model were calculated.
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Key words:
- corncob /
- hydrolysis residue /
- char /
- gasification reactivity
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TAHERZADEH M J, NIKLASSON C, LIDEN G. Conversion of dilute-acid hydrolyzates of spruce and birch to ethanol by fed-batch fermentation[J]. Bioresour Technol, 1999, 69(1): 59-66. LIN Y, TANAKA S. Ethanol fermentation from biomass resources: Current state and prospects[J]. Appl Microbiol Biotechnol, 2006, 69(6): 627-642. EZEJI T, QURESHI N, BLASCHEK H P. Butanol production from agricultural residues: Impact of degradation products on Clostridium beijerinckii growth and butanol fermentation[J]. Biotechnol Bioeng, 2007, 97(6): 1460-1469. QURESHI N, SAHA B C, COTTA M A. Butanol production from wheat straw hydrolysate using Clostridium beijerinckii[J]. Bioprocess Biosystems Eng, 2007, 30(6): 419-427. ALONSO M J G, BORREGO A G, ALVAREZ D, MENENDEZ R. A reactivity study of chars obtained at different temperatures in relation to their petrographic characteristics[J]. Fuel Process Technol, 2001, 69(3): 257-272. FENG B, BHATIA S K, BARRY J C. Structural ordering of coal char during heat treatment and its impact on reactivity[J]. Carbon, 2002, 40(4): 481-496. CETIN E, MOGHTADERI B, GUPTA R, WALL T F. Influence of pyrolysis conditions on the structure and gasification reactivity of biomass chars[J]. Fuel, 2004, 83(16): 2139-2150. ZANZI R, SJOSTROM K, BJORNBOM E. Rapid pyrolysis of agricultural residues at high temperature[J]. Biomass Bioenergy, 2002, 23(5): 357-366. ADANEZ J, DEDIEGO R F. Reactivity of lignite chars with CO2: Influence of the mineral matter[J]. Int Chem Eng, 1993, 33(4): 656-665. MARTIN S, JOSE L F M, JORGE L C. Kinetics of coal gasification[J]. Ind Eng Chem Process Des Dev, 1982, 21(2): 256-266. 黄艳琴, 阴秀丽, 吴创之, 汪丛伟, 谢建军, 周肇秋, 马隆龙, 李海滨. 稻秆半焦与CO2气化反应特性的研究[J]. 燃料化学学报, 2009, 37(3): 289-295. (HUANG Yan-qin, YIN Xiu-li, WU Chuang-zhi, WANG Cong-wei, XIE Jian-jun, ZHOU Zhao-qiu, MA Long-long, LI Hai-bin. Study on CO2 gasification reactivity of rice straw chars[J]. Journal of Fuel Chemistry and Technology, 2009, 37(3): 289-295.) HUANG Y, YIN X, WU C, WANG C, XIE J, ZHOU Z, MA L, LI H . Effects of metal catalysts on CO2 gasification reactivity of biomass char[J]. Biotechnol Adv, 2009, 27(5): 568-572. 张斌, 阴秀丽, 吴创之, 邱泽晶, 马隆龙, 武书彬. 木粉水解残渣热解半焦结构及反应性研究[J]. 农业机械学报, 2010, 41(2): 87-92. (ZHANG Bin, YIN Xiu-li, WU Chuang-zhi, QIU Ze-jing, MA Long-long, WU Shu-bin. Study on structure and CO2 gasification reactivity of acid hydrolysis residue char[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(2): 87-92.) FUSHIMI C, ARAKI K, YAMAGUCHI Y, TSUTSUMI A. Effect of heating rate on steam gasification of biomass: 1 Reactivity of char[J]. Ind Eng Chem Res, 2003, 42(17): 3922-3928. 范晓雷, 周志杰, 王辅臣, 于遵宏. 热解条件对煤焦气化活性影响的研究进展[J]. 煤炭转化, 2005, 28(3): 74-79. (FAN Xiao-lei, ZHOU Zhi-jie, WANG Fu-chen, YU Zun-hong. Study on influence of pyrolysis conditions on char gasification reactivity[J]. Coal Conversion, 2005, 28(3): 74-79.) ALONSO M J G, BORREGO A G, ALVAREZ D, MENENDEZ R. Pyrolysis behaviour of pulverised coals at different temperatures[J]. Fuel, 1999, 78(13): 1501-1513. ZOLIN A, JENSEN A D, JENSEN P A, JOHANSEN K D. Experimental study of char thermal deactivation[J]. Fuel, 2002, 81(8): 1065-1075. 楚希杰, 李文, 白宗庆, 李保庆, 陈皓侃. 神华煤直接液化残渣水蒸气和CO2气化反应性研究[J]. 燃料化学学报, 2010, 38(1): 1-5. (CHU Xi-jie, LI Wen, BAI Zong-qing, LI Bao-qing, CHEN Hao-kan. Gasification reactivity of Shenhua direct liquefaction residue with steam and CO2[J]. Journal of Fuel Chemistry and Technology, 2010, 38(1): 1-5.) 黄艳琴. 生物质两段式气化基础及试验研究. 北京: 中国科学院研究生院, 2009. (HUANG Yan-qin. The fundamental and experimental research on biomass two-stage gasification. Beijing: Graduate University of Chinese Academy of Sciences, 2009.) ZHANG L, HUANG J, FANG Y , WANG Y. Gasification reactivity and kinetics of typical Chinese anthracite chars with steam and CO2[J]. Energy Fuels, 2006, 20(3): 1201-1230. YE D P, AGNEW J B, ZHANG D K. Gasification of a South Australian low-rank coal with carbon dioxide and steam: Kinetics and reactivity studies[J]. Fuel, 1998, 77(11): 1209-1219.
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