Non-isothermal study of gasification process of coal char and biomass char in CO2 condition
Tao Xu1,Guang-wei Wang1,*,Jian-liang Zhang1,Teng-fei Song1,Run-sheng Xu2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Non-isothermal study of gasification process of coal char and biomass char in CO2 condition
Tao Xu1,Guang-wei Wang1,*,Jian-liang Zhang1,Teng-fei Song1,Run-sheng Xu2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
ժҪ Non-isothermal method was used to study gasification characteristics of three coal chars and one biomass char. Four chars were made from anthracite coal (A), bituminous coal (B), lignite coal (L), and wood refuse (W), respectively. The gasification process was studied by random pore model (RPM), unreacted core model (URCM) and volumetric model (VM). With an increase in metamorphic grade, the gasification reactivity of coal char decreased, and the gasification reactivity of biomass char was close to that of low metamorphic coal char. With an increase in heating rate, the gasification of all samples moved towards high temperature zone, and the whole gasification time decreased. It was concluded from kinetics analysis that the above-mentioned three models could be used to describe the gasification process of coal char, and the RPM fitted the best among the three models. In the RPM, the activation energies of gasification were 193��9, 225��3 and 202��8 kJ/mol for anthracite coal char, bituminous coal char and lignite coal char, respectively. The gasification process of biomass char could be described by the URCM and VM, while the URCM performed better. The activation energy of gasification of wood refuse char calculated by the URCM was 282��0 kJ/mol.
Abstract��Non-isothermal method was used to study gasification characteristics of three coal chars and one biomass char. Four chars were made from anthracite coal (A), bituminous coal (B), lignite coal (L), and wood refuse (W), respectively. The gasification process was studied by random pore model (RPM), unreacted core model (URCM) and volumetric model (VM). With an increase in metamorphic grade, the gasification reactivity of coal char decreased, and the gasification reactivity of biomass char was close to that of low metamorphic coal char. With an increase in heating rate, the gasification of all samples moved towards high temperature zone, and the whole gasification time decreased. It was concluded from kinetics analysis that the above-mentioned three models could be used to describe the gasification process of coal char, and the RPM fitted the best among the three models. In the RPM, the activation energies of gasification were 193��9, 225��3 and 202��8 kJ/mol for anthracite coal char, bituminous coal char and lignite coal char, respectively. The gasification process of biomass char could be described by the URCM and VM, while the URCM performed better. The activation energy of gasification of wood refuse char calculated by the URCM was 282��0 kJ/mol.
Tao Xu,Guang-wei Wang,*,Jian-liang Zhang,Teng-fei Song,Run-sheng Xu. Non-isothermal study of gasification process of coal char and biomass char in CO2 condition[J]. �й������ڿ���, 2017, 24(10): 985-990.
Tao Xu,Guang-wei Wang,*,Jian-liang Zhang,Teng-fei Song,Run-sheng Xu. Non-isothermal study of gasification process of coal char and biomass char in CO2 condition. Chinese Journal of Iron and Steel, 2017, 24(10): 985-990.
Fan Dong-mei, Zhu Zhi-ping, Na Yong-jie, et al.A contrastive study on reactivity of brown coal char gasification with steam and CO2[J].Journal of China Coal Society, 2013, 38(4):681-686
[2]
Fermoso J, Gil M V, Pevida C, et al.Kinetic models comparison for non-isothermal steam gasification of gasification of coal-biomass blend chars[J].Chemical Engineering Journal, 2012, 161(1-2):276-284
[3]
Ye D P, Agnew J B, Zhang D K.Gasification of a south Australian low-rank coal with carbon dioxide and steam: kinetics and reacticity studies[J].fuel, 2010, 77(11):1209-1219
[4]
Everson R C, Neomagus H W, Kasaini H, et al.Reaction kinetics of pulverized coal-chars derived form inertinite-rich coal discards: gasification with carbon dioxide and steam[J].Fuel, 2006, 85(7-8):1076-1083
[5]
XU Shen-qi, ZHOU Zhi-jie, YANG Fan, et al.Analysis on gasification reaction kinetics of Shenfu char gasified by CO2[J].Proceeding of the CSEE, 2009, 29(2):41-46
[6]
Fei Hua��Hu Song, Xiang Jun, et al.Kinetics of coal char combustion with random pore model under O2CO2 atmosphere[J].CIESC Journal, 2011, 62(1):199-205
[7]
Zhou Zhi-jie, Fan Xiao-lei, Zhang Wei, et al.Char gasification kinetics using non-isothermal TGA[J]. Journal of China Coal Society[J].Journal of China Coal Society, 2006, 31(2):219-222
[8].
[9]
Bhatia S K, Perlmutter D D.A random pore model for fluid-solid reactions: ? isothermal kinetic control[J].AIChE Journal, 1980, 26(3):379-385
[10]
Bhatia S K, Perlmutter D D.A random pore model for fluid-solid reactions: ?? Diffusion and transport effects[J].AIChE Journal, 1981, 27(2):247-254
[11]
Ochoa J, Cassanello M C, Bonelli P R, et al.CO2 gasification of argentinean coal chars a kinetic characterization[J].Fuel Processing Technology, 2001, 74(12):161-176
[12]
Kasaoka S, Sakata Y, Kayano S, et al.Kinetic evaluation of reactivity of various coal chars for gasification with carbon dioxide in comparison with stream[J].International Chemical Engineering, 1984, 25(1):160-175
[13]
Shang J Y, Eduardo E W.Kinetic and FTIR studies of the sodiumcatalyzed steam gasification of coal char[J].Fuel, 1984, 63(11):1640-1609
[14]
Yuang Xu, Cheng Zhang, Ji Xia, et al.Experimental study on the comprehensive behavior of combustion for blended coals[J]. Asia-Pacific Journal of Chemical Engineering��2010��3��435-440[J].Asia-Pacific Journal of Chemical Engineering, 2010, 5(3):435-440
[15]
Van Heek, Karl Heinrich, Muhlen, et al.Process in the kinetics of coal and char gasification[J].Chen. Eng Technol, 1987, 10(6):411-419
[16]
Radovic L R, Walker P L, Jenkins R G.Importance of carbon active sites in the gasifica-tion of coal chars[J].Fuel, 1983, 62(7):849-856
[17]
Hu Zheng-wen, Zhang Jian-liang, Zuo Hai-bin, et al.Preparation and properties of biomass char for ironmaking[J].Journal of University of Science and Technology Beijing, 2012, 34(9):998-1005
2017, Vol. 24 
