Study on CO2 gasification of biochar in molten salts: Reactivity and structure evolution

被引:56
作者
Xie, Yingpu [1 ]
Yang, Haiping [1 ]
Zeng, Kuo [1 ,2 ]
Zhu, Youjian [1 ,3 ]
Hu, Junhao [1 ]
Mao, Qiaoting [1 ]
Liu, Qingchuan [1 ]
Chen, Hanping [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Univ Sci & Technol, Dept New Energy Sci & Engn, Wuhan 430074, Hubei, Peoples R China
[3] Zhengzhou Univ Light Ind, Sch Energy & Power Engn, Zhengzhou 450002, Henan, Peoples R China
基金
中国国家自然科学基金;
关键词
Biochar; CO2; gasification; Molten salts; Reactivity; Char structure; CHAR STRUCTURE; STEAM GASIFICATION; SOLAR GASIFICATION; COAL-GASIFICATION; PETROLEUM COKE; BIOMASS; PYROLYSIS; COMBUSTION; CONVERSION; CATALYSTS;
D O I
10.1016/j.fuel.2019.06.022
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
To study the influence of molten salts on structure evolution and reactivity of biochar, CO2 gasification of biochar in molten salts (Na2CO3-K2CO3) was conducted in a fixed bed reactor. The results indicated that the reactivity of biochar was significantly enhanced with the introduction of molten salts, and the apparent activation energy reduced greatly from 145 kJ/mol for C750 (char gasification without molten salts) to 46 kJ/mol for C1MS1 (mass ratio of molten salts to char was 1:1). However, the presence of molten salts would weaken the endothermic feature of Boudouard reaction with rising gasification temperature and the enhancement of reactivity decreased gradually with mass ratio of molten salts to char increasing. Respected to the structure of char, the presence of molten salts improved biochar pore structure with the increase of external pore volume. The Raman spectra showed that molten salts could promote the decomposition of large aromatic ring systems (no less than 6 rings) into small aromatic ring systems (with 3 to 5 rings). Moreover, the microcrystalline structure of biochar in molten salts contained lower aromaticity, larger microcrystalline interlayer spacing, and smaller crystallite size. The addition of molten salts improved the biochar structure and further enhanced its gasification reactivity.
引用
收藏
页数:9
相关论文
共 47 条
  • [1] Solar gasification of biomass: A molten salt pyrolysis study
    Adinberg, R
    Epstein, M
    Karni, J
    [J]. JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME, 2004, 126 (03): : 850 - 857
  • [2] Biomass-based pyrolytic polygeneration system on cotton stalk pyrolysis: Influence of temperature
    Chen, Yingquan
    Yang, Haiping
    Wang, Xianhua
    Zhang, Shihong
    Chen, Hanping
    [J]. BIORESOURCE TECHNOLOGY, 2012, 107 : 411 - 418
  • [3] Combustion and gasification rates of lignocellulosic chars
    Di Blasi, Colomba
    [J]. PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2009, 35 (02) : 121 - 140
  • [4] Bio-syngas production with low concentrations of CO2 and CH4 from microwave-induced pyrolysis of wet and dried sewage sludge
    Dominguez, A.
    Fernandez, Y.
    Fidalgo, B.
    Pis, J. J.
    Menendez, J. A.
    [J]. CHEMOSPHERE, 2008, 70 (03) : 397 - 403
  • [5] Evolution of Structure Properties during Zhundong Coal Pyrolysis
    Dong, Qian
    Zhang, Haixia
    Zhu, Zhiping
    [J]. NEW PARADIGM OF PARTICLE SCIENCE AND TECHNOLOGY, PROCEEDINGS OF THE 7TH WORLD CONGRESS ON PARTICLE TECHNOLOGY, 2015, 102 : 4 - 13
  • [6] X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals
    Everson, Raymond C.
    Okolo, Gregory N.
    Neomagus, Hein W. J. P.
    dos Santos, Jaen-Mari
    [J]. FUEL, 2013, 109 : 148 - 156
  • [7] Variation of the crystalline structure of coal char during gasification
    Feng, B
    Bhatia, SK
    Barry, JC
    [J]. ENERGY & FUELS, 2003, 17 (03) : 744 - 754
  • [8] Experimental investigations on microstructure and adsorption property of heat-treated coal chars
    Feng, Yanyan
    Jiang, Chengfa
    Liu, Daijun
    Chu, Wei
    [J]. JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, 2013, 104 : 559 - 566
  • [9] Molten carbonates for advanced and sustainable energy applications: Part I. Revisiting molten carbonate properties from a sustainable viewpoint
    Frangini, S.
    Masi, A.
    [J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2016, 41 (41) : 18739 - 18746
  • [10] Hathaway BJ, 2011, J SOL ENERGY ENG T A, V133, P9