热解压力对生物质焦结构及气化反应性能的影响

丁亮; 张永奇; 黄戒介; 王志青; 房倚天

热解压力对生物质焦结构及气化反应性能的影响

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

基金项目: 中国科学院战略性先导科技专项(XDA07050100); 中国科学院山西煤炭化学研究所前瞻项目(2011SQZBJ01); 国家自然科学基金青年科学基金(21106173); 山西省青年科技研究基金(2013021007-2).

详细信息

通讯作者:
张永奇, 副研究员, Tel/Fax: 0351-2021137, E-mail: zhangyq@sxicc.ac.cn

中图分类号: TK6
计量
- 文章访问数: 836
- HTML全文浏览量: 18
- PDF下载量: 850
- 被引次数: 0
出版历程
- 收稿日期: 2014-07-18
- 修回日期: 2014-09-18
- 刊出日期: 2014-11-30

Effects of pyrolysis pressure on the properties and gasification reactivities of biomass chars

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

摘要

摘要: 利用加压固定床反应器、吸附仪、X射线衍射仪、元素分析仪、电感耦合等离子原子发射光谱仪等考察了热解压力对生物质半焦(以下简称半焦)产率、物化结构、元素组成的影响规律.同时,利用热天平对不同热解压力下所制半焦的气化行为进行了考察.结果表明,随热解压力升高,半焦产率增大,当压力升至1.0 MPa后,半焦产率基本不变;半焦中C元素含量随热解压力的升高而增加,而H元素含量和BET比表面积则减小;此外,随热解压力升高,玉米秸秆焦和锯末焦的石墨化程度增强,而稻壳焦的石墨化程度则基本不受热解压力影响.气化反应的研究表明,玉米秸秆焦及锯末焦的平均气化反应速率随热解压力的提高而减小,而稻壳焦的平均气化反应速率基本不受热解压力的影响.热解压力对半焦BET比表面积及碳微晶结构的影响规律与气化反应速率变化规律的对比研究表明,热解压力引起半焦微晶结构的变化是造成热解压力对半焦气化反应速率影响的主要原因.
- 生物质半焦 /
- 加压热解 /
- 碳微晶结构 /
- 气化反应性
Abstract: Biomass chars were prepared under different pyrolysis pressures in a pressurized fixed bed reactor. The evolution of chemical composition and physical structure of the biomass chars with the change of pyrolysis pressure were observed by BET, XRD, CHNS elemental analyzer and ICP-AES. The reactivities of biomass chars were evaluated by a thermogravimetric analyzer. The results show that the yields of biomass chars increase with increasing pyrolysis pressure, but reach a plateau above 1.0 MPa. With increasing pyrolysis pressure C content in biomass chars increases, while H content and BET surface area decrease. The degree of graphitization of corn stalk char and sawdust char increases with increasing pyrolysis pressure, while that of rice husk char shows almost no dependence on pyrolysis pressure. The average gasification rates of corn stalk char and sawdust char all decrease with increasing pyrolysis pressure, while pyrolysis pressure has little influence on the gasification rate of rice husk char. Compared the evolution of BET surface area and carbon crystallite structure of biomass chars with biomass char gasification rate, it shows that the difference of carbon crystallite structure of biomass chars, which was brought out by the change of pyrolysis pressure, mainly contributes to the difference of gasification rate of biomass chars prepared under different pyrolysis pressures.
- biomass char /
- pressurized pyrolysis /
- carbon crystallite structure /
- gasification reactivity

HTML全文

参考文献(21)

DI BLASI C. Combustion and gasification rates of lignocellulosic chars[J]. Prog Energy Combust, 2009, 35(2): 121-140.

CETIN E, GUPTA R, MOGHTADERI B. Effect of pyrolysis pressure and heating rate on radiata pine char structure and apparent gasification reactivity[J]. Fuel, 2005, 84(10): 1328-1334.

岳金方, 应浩, 左春丽. 生物质加压气化技术的研究与应用现状[J]. 可再生能源, 2006, 6(130): 29-32.(YUE Jin-fang, YING Hao, ZUO Chun-li. Research and application status on biomass pressure gasification[J]. Renewable Energy Resources, 2006, 6(130): 29-32.)

FERMOSO J, GIL M V, GARCIA S, PEVIDA C, PIS J J, RUBIERA F. Kinetic parameters and reactivity for the steam gasification of coal chars obtained under different pyrolysis temperatures and pressures[J]. Energy Fuels, 2011, 25(8): 3574-3580.

ROBERTS D G, HARRIS D J, WALL T F. On the effects of high pressure and heating rate during coal pyrolysis on char gasification reactivity[J]. Energy Fuels, 2003, 17(4): 887-895.

LEE C W, JENKINS R G, SCHOBERT H H. Structure and reactivity of char from elevated pressure pyrolysis of Illinois No. 6 bituminous coal[J]. Energy Fuels, 1992, 6(1): 40-47.

SUN C L, XIONG Y Q, LIU Q X, ZHANG M Y. Thermogravimetric study of the pyrolysis of two Chinese coals under pressure[J]. Fuel, 1997, 76(7): 639-644.

ZENG D, FLETCHER T H. Effects of pressure on coal pyrolysis and char morphology[J]. Energy Fuels, 2005, 19(5): 1828-1838.

YANG H P, CHEN H P, JU F D, YAN R, ZHANG S H. Influence of pressure on coal pyrolysis and char gasification[J]. Energy Fuels, 2007, 21(6): 3165-3170.

FERMOSO J, GIL M V, BORREGO A G, PEVIDA C, PIS J J, RUBIERA F. Effect of the pressure and temperature of devolatilization on the morphology and steam gasification reactivity of coal chars[J]. Energy Fuels, 2010, 24(10): 5586-5595.

OKUMURA Y, HANAOKA T, SAKANISHI K. Effect of pyrolysis conditions on gasification reactivity of woody biomass-derived char[J]. Proc Combust Ins, 2009, 32: 2013-2020.

CETIN E, MOGHTADERI B, GUPTA R, WALL T F. Biomass gasification kinetics: Influences of pressure and char structure[J]. Combust Sci Technol, 2005, 177(4): 765-791.

CHEN G, YU Q, SJ STR M K. Reactivity of char from pyrolysis of birch wood[J]. J Anal Appl Pyrolysis, 1997, 40-41: 491-499.

DEGROOT W F,SHAFIZADEH F. Kinetics of gasification of Douglas Fir and Cottonwood chars by carbon dioxide[J]. Fuel, 1984, 63(2): 210-216.

DUPONT C, NOCQUET T, DA COSTA JR J A, VERNE-TOURNON C. Kinetic modelling of steam gasification of various woody biomass chars: Influence of inorganic elements[J]. Bioresour Technol, 2011, 102(20): 9743-9748.

ZHANG Y, ASHIZAWA M, KAJITANI S, MIURA K. Proposal of a semi-empirical kinetic model to reconcile with gasification reactivity profiles of biomass chars[J]. Fuel, 2008, 87(4/5): 475-481.

ARENDT P, VAN HEEK K H. Comparative investigations of coal pyrolysis under inert gas and H₂ at low and high heating rates and pressures up to 10 MPa[J]. Fuel, 1981, 60(9): 779-787.

鞠付栋, 陈汉平, 杨海平, 沈应强, 张世红. 煤加压热解过程中C和H的转变规律[J]. 煤炭转化, 2009, 32(1): 5-9.(JU Fu-dong, CHEN Han-ping, YANG Hai-ping, SHEN Ying-qiang, ZHANG Shi-hong. Conversion of C and H during coal pressurized pyrolysis[J]. Coal Conversion, 2009, 32(1): 5-9.)

CHEN H, LUO Z, YANG H, JU F, ZHANG S. Pressurized pyrolysis gasification of chinese typical coal samples[J]. Energy Fuels, 2008, 22(2): 1136-1141.

范晓雷, 张薇, 周志杰, 王辅臣, 于遵宏. 热解压力及气氛对神府煤焦气化反应活性的影响[J]. 燃料化学学报, 2005, 33(5): 530-533.(FAN Xiao-lei, ZHANG Wei, ZHOU Zhi-jie, WANG Fu-chen, YU Zun-hong. Effects of pyrolysis pressure and atmosphere on gasification reactivity of Shenfu char[J]. Journal of Fuel Chemistry and Technology, 2005, 33(5): 530-533.)

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.

施引文献

资源附件(0)

访问统计