碳化玉米秸秆燃烧过程的动力学
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摘要
利用未反应核模型、随机孔模型和体积模型,对无烟煤、烟煤和碳化玉米秸秆的燃烧过程进行了动力学分析,研究玉米秸秆碳化后替代无烟煤和烟煤作为高炉喷吹燃料的可行性。结果表明,无烟煤煤粉的燃烧过程更符合未反应核模型的燃烧过程,而烟煤和碳化玉米秸秆更符合随机孔模型的反应规律。碳化玉米秸秆具有相对较低的起始反应温度和燃尽温度,在相同的温度条件下具有更高的燃烧反应速率,因此可作为至少部分替代无烟煤和烟煤燃料在高炉铁水冶炼过程中进行喷吹。
In order to analyze the feasibility of applying carbonized corn straw to replace anthracite and bituminite for injection into blast furnaces,the kinetics of combustion processes of anthracite,bituminite and carbonized corn straw was investigated through carrying out experiments and mathematical modeling using unreacted core,random pore and volume models. The results indicated that the combustion behavior of anthracite powder agreed better with the unreacted core model,while that of bituminite and carbonized corn straw powders fitted better with the random pore model. Due to its lower initial combustion and burnout temperatures,the carbonized corn straw powder had a higher combustion rate at the same temperature. Therefore,it could be feasible to apply the carbonized corn straw to replace,at least partially,the anthracite and bituminite fuels for injection into blast furnaces in ironmaking.
In order to analyze the feasibility of applying carbonized corn straw to replace anthracite and bituminite for injection into blast furnaces,the kinetics of combustion processes of anthracite,bituminite and carbonized corn straw was investigated through carrying out experiments and mathematical modeling using unreacted core,random pore and volume models. The results indicated that the combustion behavior of anthracite powder agreed better with the unreacted core model,while that of bituminite and carbonized corn straw powders fitted better with the random pore model. Due to its lower initial combustion and burnout temperatures,the carbonized corn straw powder had a higher combustion rate at the same temperature. Therefore,it could be feasible to apply the carbonized corn straw to replace,at least partially,the anthracite and bituminite fuels for injection into blast furnaces in ironmaking.
引文
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[4]王海洋,张建良,王广伟,等.褐煤用于高炉喷吹的可行性[J].钢铁研究学报,2017,29(1):39-43.
[5]OCHOA J,CASSANELLO M C,BONELLI P R,et al.CO2gasification of argentinean coal chars a kinetic characterization[J].Fuel Processing Technology,2001,74(3):96-108.
[6]BHATIA S K,PERLMUTTER D D.A random pore model for fluid-solid reactions:II Diffusion and transport effects[J].Aiche Journal,1981,27(2):247-254.
[7]KASAOKA S,SAKATA Y,KAYANO S.Kinetic evaluation of reactivity of various coal chars for gasification with carbon dioxide in comparison wiht stream[J].Internation Chemical Engineering,1984,25(1):160-217.
[8]JUPUDI R S,ZAMANSKY V,FLETCHER T H.Prediction of light gas composition in coal devolatilization[J].Energy&Fuels,2009,23(6):3063-3067.
[9]FRANCIOSO O,SANCHEZ-CORTES S,BONORA S,et al.Structural characterization of charcoal size-fractions from a burnt pinus pinea forest by FT-IR Raman and surface-enhanced Raman spectroscopies[J].Journal of Molecular Structure,2011,994(1):155-162.
[10]SONIBARE O O,HAEGER T,FOLEY S F.Structural characterization of Nigerian coals by X-ray diffraction,Raman and FTIR spectroscopy[J].Energy,2010,35(12):5347-5353.
[11]LI C Z.Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal[J].Fuel,2007,86(12):1664-1683.
[12]IBARRA J V,MOLINEAR R,BONET A J.FT-IR investigation on char formation during the early stages of coal pyrolysis.Fuel[J].1994,73(6):918-24.
[13]LI K J,KHANNA R,ZHANG J L,et al.Comprehensive investigation of various structual features of bituminous coals using advanced analytical techniques[J].Energy&Fuels,2015,29(11):7178-7179.
[14]BAYSAL M,YURUM A,YIDIZ B,et al.Structure of some western anatolia coals investigated by FTIR,Raman,13 C solid state NMR spectroscopy and X-ray diffraction.[J].International Journal of Coal Geology,2016,163:166-167.
[15]WANG Q,YE J B,YANG H Y,et al.Chemical composition and structural characteristics of oil shales and their kerogens using fourier transform infrared(FTIR)spectroscopy and solid-state13C nuclear magnetic resonance(NMR)[J].Energy&Fuels,2016,30(8):6271-6280.
[16]ZHANG J L,GUO J,WANG G W,et al.Kinetics of petroleum coke/biomass blends during co-gasification[J].Internation Journal of Minerals,Metallurgy and Materials,2016,23(9):1001-1010.
[17]WANG G W,ZHANG J L,SHAO J G,et al.Experimental and kinetic modeling for the oxidative decomposition of herbaceous and wooden residues[J].Bioresource,2016,11(2):4821-4838.
[18]WANG G W,ZHANG J L,SHAO J G,et al.Thermogravimetric analysis of coal char combusiton kinetics[J].Journal of Iron and Steel Research,International,2014,21(10):897-904.