神华烟煤氧化自燃过程及失水机理研究
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摘要
为了研究煤氧化自燃的反应过程及反应机理,利用热重分析方式模拟煤自燃发生的整个过程得到煤氧化自燃过程的TG-DTG曲线。研究分析了煤氧化自燃过程的TG-DTG曲线,并应用Malek方法分析了煤氧化自燃过程中失水失重阶段的反应机理。研究结果表明:煤氧化自燃的过程可分为四个阶段,失水失重阶段、吸氧增重阶段、受热裂解阶段和快速燃烧阶段。利用Malek法得到了失水失重阶段的最概然机理函数,并用作图法验证了所求最概然机理函数的正确性。
In order to study the reaction process of coal oxidation and spontaneous combustion and the reaction mechanism,thermogravimetric analysis was used to simulate the whole process of coal spontaneous combustion to obtain the whole curves of TG-DTG. The TG-DTG curves of coal spontaneous combustion process were analyzed. Using the Malek method,the reaction mechanism of the dehydration and weightlessness stage in coal spontaneous combustion process were analyzed. The experiment results showed that the process of coal oxidation and spontaneous combustion could be divided into four stages,the stage of water loss and weight decrease,the stage of oxidation and weight increase,the stage of thermal cracking and rapid combustion. By using the Malek method,the most probable mechanism function of the stage of water loss was obtained,and the correctness of the mechanism function was verified by the mapping method.
In order to study the reaction process of coal oxidation and spontaneous combustion and the reaction mechanism,thermogravimetric analysis was used to simulate the whole process of coal spontaneous combustion to obtain the whole curves of TG-DTG. The TG-DTG curves of coal spontaneous combustion process were analyzed. Using the Malek method,the reaction mechanism of the dehydration and weightlessness stage in coal spontaneous combustion process were analyzed. The experiment results showed that the process of coal oxidation and spontaneous combustion could be divided into four stages,the stage of water loss and weight decrease,the stage of oxidation and weight increase,the stage of thermal cracking and rapid combustion. By using the Malek method,the most probable mechanism function of the stage of water loss was obtained,and the correctness of the mechanism function was verified by the mapping method.
引文
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[2]FIERRO V,MIRANDA J L,ROMERO C.Prevention of spontaneous combustion in coal stockpiles:Experimental results in coal storage yard[J].Fuel Processing Technology,1999,59(1):23-34.
[3]TANG Y,XUE S.Laboratory study on the spontaneous combustion propensity of lignite undergone heating treatment at low temperature in inert and low-oxygen environments[J].Energy&Fuels,2015,29(8):150330080647009.
[4]TANG Y.The influences of manganese and phosphorus on the low-temperature oxidation of coal[J].International Journal of Coal Preparation&Utilization,2015,35(2):63-75.
[5]WANG Y,SHI G,GUO Z.Heat transfer and thermodynamic processes in coal-bearing strata under the spontaneous combustion condition[J].Numerical Heat Transfer,1969,71(1):1-16.
[6]WANG Y M,WANG W Z,SHAO Z L,et al.Terahertz measurement of indicator gas emission from coal spontaneous combustion at low temperature[J].Ecological Chemistry and Engineering,2014,20(4):709-718.
[7]ZHANG Y,WANG J,XUE S.Evaluation of the susceptibility of coal to spontaneous combustion by a TG profile subtraction method[J].Korean Journal of Chemical Engineering,2016,33(3):1-11.
[8]LI Z,ZHANG Y,JING X.Insight into the intrinsic reaction of brown coal oxidation at low temperature:Differential scanning calorimetrystudy[J].Fuel Processing Technology,2016,147(2):64-70.
[9]张斌,刘建忠,赵卫东,等.褐煤自燃特性热重实验及动力学分析[J].热力发电,2014,43(6):71-76.
[10]BENFELL K E,BEAMISH B B,RODGERS K A.Thermogravimetric analytical procedures for characterizing new zealand and eastern australian coals[J].Thermochimica Acta,1996,286:67-74.
[11]何启林,王德明.煤的氧化和热解反应的动力学研究[J].工程科学学报,2006,28(1):1-5.
[12]王雪峰,孙艳秋,李丽,等.双外推法对煤氧化燃烧的动力学特性研究[J].中国安全生产科学技术,2014,10(9):72-76.
[13]王继仁,邓存宝,单亚飞,等.煤的自燃倾向性新分类方法[J].煤炭学报,2008,33(1):47-50.
[14]王龙,李寒旭.基于热解活化能判定煤自燃倾向性的新方法[J].煤炭技术,2016,35(4):174-176.
[15]KUS J,MISZ-KENNAN M.Coal weathering and laboratory(artificial)coal oxidation[J].International Journal of Coal Geology,2016,171:12-36.
[16]梁晓瑜,王德明.水分对煤炭自燃的影响[J].辽宁工程技术大学学报,2003,22(4):472-474.
[17]XU Tao,WANG De-ming,HE Qi-lin.The study of the critical moisture content at which coal has the most high tendency to spontaneous combustion[J].International Journal of Coal Preparation&Utilization,2013,33(3):117-127.
[18]BHAT S,AGARWAL P K.The effect of moisture condensation on the spontaneous combustibility of coal[J].Fuel,1996,75(13):1523-1532.
[19]李永昕,薛冰,李再峰,等.凝结热对低阶煤低温氧化过程的影响[J].燃料化学学报,2006,34(4):408-411.
[20]王秀军,张守玉,彭定茂,等.多孔介质干燥机理在褐煤热力脱水中的应用[J].煤炭转化,2011,34(1):82-86.
[21]战婧,王寅,王海晖.煤氧化增重现象中的控制反应及其动力学解析[J].化学学报,2012,70(8):980-988.
[22]WANG H,DLUGOGORSKI B Z,KENNEDY E M.Coal oxidation at low temperatures:oxygen consumption,xxidation products,reaction mechanism and kinetic modeling[J].Cheminform,2003,29(6):487-513.
[23]胡荣祖,高胜利,赵凤起.热分析动力学(第二版)[M].北京:科学出版社,2008.
[24]赵卫东,刘建忠,周俊虎,等.褐煤等温脱水热重分析[J].中国电机工程学报,2009,29(14):74-79.