一种计算煤自燃耗氧速率的新方法（英文）
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摘要
根据煤自燃的热量传导和传质特性、阿伦尼乌兹公式和Ranz-Marshall方程,提出了一种估算煤在高温自燃耗氧速率的新方法。与传统方法相比,该方法不仅考虑了煤的自燃动力学特性和温度,还包含了煤粉的环境气流特性和粒径,并通过煤自燃程序升温实验与理论结果的对比,表明该方法计算的氧耗速率与实验结果一致,验证了该方法的有效性。
Based on heat and mass transfer characteristics of spontaneous combustion of coal, Arrhenius equation and the Ranz-Marshall correlation, a novel approach was proposed in this paper to estimate oxygen consumption rate of self-ignition of coal at high temperature. Compared with the conventional methods, this approach involves not only kinetic properties of self-ignition of coal and temperature, but also the ambient air flow characteristics and diameter of coal particle. To testify the proposed approach, oxygen consumption rates at high temperature were measured by the programmable isothermal oven experiments. Comparisons between experimental and theoretical results indicate that the rates of oxygen depletion calculated by the proposed approach agree well with those measured from laboratory-scale experiments, which further validates the proposed approach.
Based on heat and mass transfer characteristics of spontaneous combustion of coal, Arrhenius equation and the Ranz-Marshall correlation, a novel approach was proposed in this paper to estimate oxygen consumption rate of self-ignition of coal at high temperature. Compared with the conventional methods, this approach involves not only kinetic properties of self-ignition of coal and temperature, but also the ambient air flow characteristics and diameter of coal particle. To testify the proposed approach, oxygen consumption rates at high temperature were measured by the programmable isothermal oven experiments. Comparisons between experimental and theoretical results indicate that the rates of oxygen depletion calculated by the proposed approach agree well with those measured from laboratory-scale experiments, which further validates the proposed approach.
引文
[1] YANG Fu-qiang, WU Chao, LI Zi-jun. Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores[J]. Journal of Central South University, 2014, 21(2):715-719.
[2] YANG Fu-qiang, WU Chao. Mechanism of mechanical activation for spontaneous combustion of sulfide minerals[J].Transactions of Nonferrous Metals Society of China, 2013,23(1):276-282.
[3] ZHANG Jiang-zhong, KUENZER C. Thermal surface characteristics of coal fires 1:Results of in-situ measurements[J]. Journal of Applied Geophysics, 2007,63(3):117-134.
[4] ZHU Hong-qing, SONG Ze-yang, TAN Bo, HAO Yu-ze.Numerical investigation and theoretical prediction of self-ignition characteristics of coarse coal stockpiles[J].Journal of Loss Prevention in the Process Industries, 2013,26(1):236-244.
[5] TARABA B, MICHALEC Z. Effect of longwall face advance rate on spontaneous heating process in the gob area-CFD modelling[J]. Fuel, 2011, 90(8):2790-2797.
[6] YUAN Li-ming, SMITH A C. The effect of ventilation on spontaneous heating of coal[J]. Journal of Loss Prevention in the Process Industries, 2012, 25(1):131-137.
[7] QIN Yue-ping, LIU Wei, YANG Chun, FAN Zheng-zhong,WANG Liang-liang, JIA Guo-wei. Experimental study on oxygen consumption rate of residual coal in goaf[J]. Safety Science, 2012, 50(4):787-791.
[8] YUAN Li-ming, SMITH A C. Numerical study on effects of coal properties on spontaneous heating in longwall gob areas[J]. Fuel, 2008, 87(15):3409-3419.
[9] AKGUN F, ESSENHIGH R H. Self-ignition characteristics of coal stockpiles:Theoretical prediction from a two-dimensional unsteady-state model[J]. Fuel, 2001, 80(3):409-415.
[10] EJLALI A, AMINOSSADATI S M,HOOMAN K,BEAMISH B B. A new criterion to design reactive coal stockpiles[J]. International Communications in Heat and Mass Transfer, 2009, 36(7):669-673.
[11] EJLALI A, MEE D J, HOOMAN K, BEAMISH B B.Numerical modelling of the self-heating process of a wet porous medium[J]. International Journal of Heat and Mass Transfer, 2011, 54(25):5201-5206.
[12] KRISHNASWAMY S, AGARWAL P K, GUNN R D.Low-temperature oxidation of coal 3. Modelling spontaneous combustion in coal stockpiles[J]. Fuel, 1996, 75(3):353-362.
[13] KUENZER C, STRACHER G B. Geomorphology of coal seam fires[J]. Geomorphology, 2012,138(1):209-222.
[14] STRACHER G B. Coal fires burning around the world:A global catastrophe[J]. International Journal of Coal Geology,2004,59(1,2):1-6.
[15] WU Jian-jun, LIU Xiao-chen. Risk assessment of underground coal fire development at regional scale[J].International Journal of Coal Geology, 2011, 86(1):87-94.
[16] VAN D P, ZHANG Jian-zhong, JUN Wang, KUENZER C,WOLF Karl-Heinz. Assessment of the contribution of in-situ combustion of coal to greenhouse gas emission; based on a comparison of Chinese mining information to previous remote sensing estimates[J]. International Journal of Coal Geology, 2011, 86(1):108-119.
[17] ROSEMA A, GUAN H, VELD H. Simulation of spontaneous combustion, to study the causes of coal fires in the Rujigou basin[J]. Fuel, 2001, 80(1):7-16.
[18] ZHU Jian-fang, HE Ning, LI Deng-ji. The relationship between oxygen consumption rate and temperature during coal spontaneous combustion[J]. Safety Science, 2012,50(4):842-845.
[19] BEAMISH B B, BARAKAT M A, GEORGE J D S.Adiabatic testing procedures for determining the self-heating propensity of coal and sample ageing effects[J].Thermochimica Acta, 2000,362(1,2):79-87.
[20] BEAMISH B B, BLAZAK D G Relationship between ash content and R70 self-heating rate of callide coal[J].International Journal of Coal Geology, 2005, 64(1, 2):126-132.
[21] HE Qi-lin, WANG De-ming. Comprehensive study on the rule of spontaneous combustion coal in oxidation process by TG-DTA-FTIR technology[J]. Journal of China Coal Society, 2005, 30(1):53-57.(in Chinese)
[22] KRAJCIOV M,JELEMENSK L,KISA M,MARKOS J.Model predictions on self-heating and prevention of stockpiled coals[J]. Journal of Loss Prevention in the Process Industries, 2004, 17(3):205-216.
[23] WESSLING S, KESSELS W, SCHMIDT M, KRAUSE U.Investigating dynamic underground coal fires by means of numerical simulation[J]. Geophysical Journal International,2008, 172(1):439-454.
[24] FU Wei-biao. The macro-general rules of coal combustion theories[M]. Beijing:Tsinghua University Press, 2003.(in Chinese)
[25] CHERTOCK A, KURGANOV A, PETROVA G Fast explicit operator splitting method for convection-diffusion equations[J]. International Journal for Numerical Methods in Fluids,2009, 59(3):309-332.
[26] DUARTE M, DESCOMBES S P, TENAUD C, CANDEL S B, MASSOT M. Time-space adaptive numerical methods for the simulation of combustion fronts[J]. Combustion and Flame, 2013, 160(6):1083-1101.
[2] YANG Fu-qiang, WU Chao. Mechanism of mechanical activation for spontaneous combustion of sulfide minerals[J].Transactions of Nonferrous Metals Society of China, 2013,23(1):276-282.
[3] ZHANG Jiang-zhong, KUENZER C. Thermal surface characteristics of coal fires 1:Results of in-situ measurements[J]. Journal of Applied Geophysics, 2007,63(3):117-134.
[4] ZHU Hong-qing, SONG Ze-yang, TAN Bo, HAO Yu-ze.Numerical investigation and theoretical prediction of self-ignition characteristics of coarse coal stockpiles[J].Journal of Loss Prevention in the Process Industries, 2013,26(1):236-244.
[5] TARABA B, MICHALEC Z. Effect of longwall face advance rate on spontaneous heating process in the gob area-CFD modelling[J]. Fuel, 2011, 90(8):2790-2797.
[6] YUAN Li-ming, SMITH A C. The effect of ventilation on spontaneous heating of coal[J]. Journal of Loss Prevention in the Process Industries, 2012, 25(1):131-137.
[7] QIN Yue-ping, LIU Wei, YANG Chun, FAN Zheng-zhong,WANG Liang-liang, JIA Guo-wei. Experimental study on oxygen consumption rate of residual coal in goaf[J]. Safety Science, 2012, 50(4):787-791.
[8] YUAN Li-ming, SMITH A C. Numerical study on effects of coal properties on spontaneous heating in longwall gob areas[J]. Fuel, 2008, 87(15):3409-3419.
[9] AKGUN F, ESSENHIGH R H. Self-ignition characteristics of coal stockpiles:Theoretical prediction from a two-dimensional unsteady-state model[J]. Fuel, 2001, 80(3):409-415.
[10] EJLALI A, AMINOSSADATI S M,HOOMAN K,BEAMISH B B. A new criterion to design reactive coal stockpiles[J]. International Communications in Heat and Mass Transfer, 2009, 36(7):669-673.
[11] EJLALI A, MEE D J, HOOMAN K, BEAMISH B B.Numerical modelling of the self-heating process of a wet porous medium[J]. International Journal of Heat and Mass Transfer, 2011, 54(25):5201-5206.
[12] KRISHNASWAMY S, AGARWAL P K, GUNN R D.Low-temperature oxidation of coal 3. Modelling spontaneous combustion in coal stockpiles[J]. Fuel, 1996, 75(3):353-362.
[13] KUENZER C, STRACHER G B. Geomorphology of coal seam fires[J]. Geomorphology, 2012,138(1):209-222.
[14] STRACHER G B. Coal fires burning around the world:A global catastrophe[J]. International Journal of Coal Geology,2004,59(1,2):1-6.
[15] WU Jian-jun, LIU Xiao-chen. Risk assessment of underground coal fire development at regional scale[J].International Journal of Coal Geology, 2011, 86(1):87-94.
[16] VAN D P, ZHANG Jian-zhong, JUN Wang, KUENZER C,WOLF Karl-Heinz. Assessment of the contribution of in-situ combustion of coal to greenhouse gas emission; based on a comparison of Chinese mining information to previous remote sensing estimates[J]. International Journal of Coal Geology, 2011, 86(1):108-119.
[17] ROSEMA A, GUAN H, VELD H. Simulation of spontaneous combustion, to study the causes of coal fires in the Rujigou basin[J]. Fuel, 2001, 80(1):7-16.
[18] ZHU Jian-fang, HE Ning, LI Deng-ji. The relationship between oxygen consumption rate and temperature during coal spontaneous combustion[J]. Safety Science, 2012,50(4):842-845.
[19] BEAMISH B B, BARAKAT M A, GEORGE J D S.Adiabatic testing procedures for determining the self-heating propensity of coal and sample ageing effects[J].Thermochimica Acta, 2000,362(1,2):79-87.
[20] BEAMISH B B, BLAZAK D G Relationship between ash content and R70 self-heating rate of callide coal[J].International Journal of Coal Geology, 2005, 64(1, 2):126-132.
[21] HE Qi-lin, WANG De-ming. Comprehensive study on the rule of spontaneous combustion coal in oxidation process by TG-DTA-FTIR technology[J]. Journal of China Coal Society, 2005, 30(1):53-57.(in Chinese)
[22] KRAJCIOV M,JELEMENSK L,KISA M,MARKOS J.Model predictions on self-heating and prevention of stockpiled coals[J]. Journal of Loss Prevention in the Process Industries, 2004, 17(3):205-216.
[23] WESSLING S, KESSELS W, SCHMIDT M, KRAUSE U.Investigating dynamic underground coal fires by means of numerical simulation[J]. Geophysical Journal International,2008, 172(1):439-454.
[24] FU Wei-biao. The macro-general rules of coal combustion theories[M]. Beijing:Tsinghua University Press, 2003.(in Chinese)
[25] CHERTOCK A, KURGANOV A, PETROVA G Fast explicit operator splitting method for convection-diffusion equations[J]. International Journal for Numerical Methods in Fluids,2009, 59(3):309-332.
[26] DUARTE M, DESCOMBES S P, TENAUD C, CANDEL S B, MASSOT M. Time-space adaptive numerical methods for the simulation of combustion fronts[J]. Combustion and Flame, 2013, 160(6):1083-1101.
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