柠条塔矿2~(-2)煤自然发火特征温度及其影响因素研究
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摘要
柠条塔矿属易自燃矿井,矿区内曾发生地面煤仓、周边小窑采空区、煤层露头自燃现象。该矿区地表漏风情况严重,容易引起采空区浮煤自燃,加强对该矿区自燃规律及特征温度的深入研究对该矿的煤自燃预测预报及安全生产具有重要意义。
本论文采用理论和实验相结合的方法,对柠条塔矿2~(-2)煤进行了程序升温实验和自然发火实验,通过对实验过程中的各个自燃特性参数及指标气体进行分析,确定该煤层的自燃规律。并通过对实验结果进行分析,确定临界温度、裂解温度和裂变温度等特征温度点的温度范围及相应温度点煤自燃特性参数及指标气体的变化规律,进而确定其相应特征温度的表征参数,为柠条塔2~(-2)煤自燃预测预报提供参考依据。
通过对柠条塔2~(-2)煤煤样进行热重分析实验,对实验所得75组TG曲线和DTG曲线进行分析,在每组曲线上得出了煤样的高位吸附温度、临界温度、干裂温度、活性温度、着火点温度等各个特征温度,结合煤自燃程序升温实验及自然发火实验确定各个特征温度范围。最后着重分析实验条件中粒度、氧浓度以及升温速率对各特征温度点及热重曲线的影响规律,很好的反应了煤的氧化反应过程,对于判断柠条塔2~(-2)煤的自燃倾向性及进行煤自燃预测预报具有一定的指导意义。
Ningtiaota Coal Mine belongs to the coal mines that are easy to spontaneous combustion, in the coal mining area, spontaneous combustion once occurred in bunker, the surrounding small ground coal goaf and furnace outcrops The mine air leakage was severe, easy to result in spontaneous combustion of goaf float coal, strengthen in-depth study on the spontaneous combustion laws and characteristic temperature are significant for prediction of spontaneous combustion and safety production of the coal mine.
In this paper, combined with theories and experiments, program temperature experiments and spontaneous experiments were carried out on Ningtiaota 2~(-2) coal samples, through the analysis of each spontaneous combustion characteristic parameters and index in the experiments process, the spontaneous combustion rule was determined. And through the analysis of the test results, temperature range of the critical temperature, pyrolysis temperature and fission temperature and the spontaneous combustion characteristic parameters and change laws of index gases, was determined, parameters of the corresponding characteristic temperature were obtained, which could provide reference for prediction of coal spontaneous combustion of Ningtiaota 2~(-2) coal seam.
Through thermogravimetric analysis experiment of the coal samples, according to the experiment results, 75 group TG curves and DTG curves were analyzed, in each suite of curve, high adsorption temperature, the critical temperature, temperature, active temperature, dry ignition temperature were obtained, combined with program temperature experiments and spontaneous experiments, various characteristic temperature range were determined. Finally focuses on analyzing influence rules of the grain size, oxygen concentration of heating rate on each feature temperature point and thermogravimetric curve, which were good reflection of the coal oxidation reaction process, and were significant for judgment of the self-ignition orientation and prediction of coal spontaneous combustion of Ningtiaota 2~(-2) coal seam.
本论文采用理论和实验相结合的方法,对柠条塔矿2~(-2)煤进行了程序升温实验和自然发火实验,通过对实验过程中的各个自燃特性参数及指标气体进行分析,确定该煤层的自燃规律。并通过对实验结果进行分析,确定临界温度、裂解温度和裂变温度等特征温度点的温度范围及相应温度点煤自燃特性参数及指标气体的变化规律,进而确定其相应特征温度的表征参数,为柠条塔2~(-2)煤自燃预测预报提供参考依据。
通过对柠条塔2~(-2)煤煤样进行热重分析实验,对实验所得75组TG曲线和DTG曲线进行分析,在每组曲线上得出了煤样的高位吸附温度、临界温度、干裂温度、活性温度、着火点温度等各个特征温度,结合煤自燃程序升温实验及自然发火实验确定各个特征温度范围。最后着重分析实验条件中粒度、氧浓度以及升温速率对各特征温度点及热重曲线的影响规律,很好的反应了煤的氧化反应过程,对于判断柠条塔2~(-2)煤的自燃倾向性及进行煤自燃预测预报具有一定的指导意义。
Ningtiaota Coal Mine belongs to the coal mines that are easy to spontaneous combustion, in the coal mining area, spontaneous combustion once occurred in bunker, the surrounding small ground coal goaf and furnace outcrops The mine air leakage was severe, easy to result in spontaneous combustion of goaf float coal, strengthen in-depth study on the spontaneous combustion laws and characteristic temperature are significant for prediction of spontaneous combustion and safety production of the coal mine.
In this paper, combined with theories and experiments, program temperature experiments and spontaneous experiments were carried out on Ningtiaota 2~(-2) coal samples, through the analysis of each spontaneous combustion characteristic parameters and index in the experiments process, the spontaneous combustion rule was determined. And through the analysis of the test results, temperature range of the critical temperature, pyrolysis temperature and fission temperature and the spontaneous combustion characteristic parameters and change laws of index gases, was determined, parameters of the corresponding characteristic temperature were obtained, which could provide reference for prediction of coal spontaneous combustion of Ningtiaota 2~(-2) coal seam.
Through thermogravimetric analysis experiment of the coal samples, according to the experiment results, 75 group TG curves and DTG curves were analyzed, in each suite of curve, high adsorption temperature, the critical temperature, temperature, active temperature, dry ignition temperature were obtained, combined with program temperature experiments and spontaneous experiments, various characteristic temperature range were determined. Finally focuses on analyzing influence rules of the grain size, oxygen concentration of heating rate on each feature temperature point and thermogravimetric curve, which were good reflection of the coal oxidation reaction process, and were significant for judgment of the self-ignition orientation and prediction of coal spontaneous combustion of Ningtiaota 2~(-2) coal seam.
引文
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[2]徐剑.2006年世界各地区煤炭产销量统计一览[J].环球能源网.2007.6.20
[3]我国煤炭能源战略地位.中国煤炭工业网.2003.11.29
[4]《煤矿瓦斯治理与应用总体方案》编制工作组.煤矿瓦斯治理与利用总体方案[M].中华人民共和国国家发展与改革委员会.2005.6.22
[5]刘灿.易自燃煤层无煤柱开采自燃规律及防治技术研究(硕士学位论文)[D].西安科技大学.2006.4
[6]周西华.双高矿井采场自燃与爆炸特性及防治技术研究(博士学位论文)[D]辽宁工程技术大学.2006.6
[7]李增华.煤炭自燃的自由基反应机理[J].中国矿业大学学报,1996,25(3):112~113
[8]李文.煤的低温氧化与自燃[J].煤炭转化,1995,18(1):10~16
[9] Lopez.D.etc.,effect of low-temperature oxidation of coal on thdrogen-transfer capability, Fuel,1998,77(14):1623~1628
[10] Wang.H.etc,Theoretical analysis of reaction regimes in low-temperature oxidation of coal,Fuel,1999,78(9):1073~1081
[11]彭本信.应用热分析技术研究煤的氧化自燃过程[J].煤炭工程师,1992,(2):1~12
[12]舒新前.煤炭自燃的热分析研究[J].中国煤田地质,1994,6(2):27~29
[13] Grossman,etc,Molecular hydrogen evolution as a consequence of atmospheric oxidation of coal:v 73,n 5,May,1994,p762~767
[14]路继根.用热重法研究我国四种煤显微组分的燃烧特性[J].燃料化学学报,1996,24(4):329~334
[15] Jose J.Pis,G.de la Puente,E.Fuenye,A.Moran,F.Rubiera.A study of the self-heating of fresh and oxidized coals by differential thermal analysis,Thermochimica Atcta,1996,(279):93~101
[16]陈勤妹,黄瀛华,任德庆,蔡根才.应用TG-DTA-T-DTG和EGD-GC评价粉煤的燃烧特性[J].华东理工大学学报,23(3):1997.06
[17] Bowes,P.C. Self-heating: Evaluating and controlling the Hazard, Elservier, Amsterdam, 1984
[18]刘剑.煤的活化能理论研究[J].煤炭学报,1999,24(3):316~320
[19]陶著.煤化学[M].北京:化学工业出版社,1984.141
[20]钟蕴英.煤化学[M].中国矿业大学出版社,1989.6
[21]刘艳华.X射线光电子能谱确定铜川煤及其焦中氮的形态[J].西安交通大学学报,2001,35(7):661~665
[22] Shinn J H,Study of coal molecular structure[J].Fuel,1984,63:83
[23]王娜.煤中低分子化合物研究进展[J].煤炭转化,1997,20(3):19~22
[24] Nishoka M,The associated nature of bituminous coal[J].Fuel,1992,71:941~948
[25] X.J.Hou,et al,Theoretical study on the reactivity of coal structure,in Prospects for coal science in the 21st century,1999,295~298
[26] Takanohashi T,Iino M.Ivestigation of bituminous structure of Upper Freeport Coal by solvent swelling.Energy Fuels,1995,9:788~793
[27] Given P H,Marzec A,Barton W A etal.The concept of a mobile or molecular phase within the marcromolecular network of coals:adebate[J].Fuel,1986,65:155~163
[28]傅家谟等.干酪根地球化学[J].广州:广东科技出版社,1995,425~441
[29] Carlson G.A.et al,Modeling of coal structure by using computer-aided molecular design ACS symposium series,1991,461
[30]刘旭光.煤大分子结构的计算机模拟[J].煤炭转化,1999,22(3):1~5
[31]鹰嘴利工,饭野雅,化学工学论文集,1994,20(6),959~963
[32] P.Strka,et al,Chemical structure of maceral groups of coal,in Prospects for coal science in the 21st century[R].1999,113~116
[33] Peter Nordon,Brian C.Young and Norman W.Bainbridge,The rate of oxisation of Char and coal in relation to their tendency to self-heat[J],Fuel,1979(58):443~449
[34]徐精彩.煤炭自燃过程研究[J].煤炭工程师,1989,(5):17~21
[35]何萍.煤氧化过程中氧化的形成特征与煤自燃指标的选择[J].煤炭学报,1994,19(6):637~642
[36]舒新前.神府煤煤岩组分的结构特征及其差异[J].燃料化学学报,1996,24(5):427~432
[37]舒新前.神府煤煤岩组分的表面电位研究[J].中国科学,1996,25(1):333~338
[38]葛岭梅.煤分子中活性基团氧化与煤的自燃机制探讨[J].西安矿业学院学报,1998,8(1):90~94
[39]王晓华.神府煤流化床低温氧化煤分子中活性基团的变化[J].西安科技学院学报,2001,21(1):40~43
[40]周静.热失重仪研究煤快速热解[J].煤炭转化,2004,27(2):31~36
[41]张玉贵.镜煤和丝炭自燃倾向性研究[J].煤矿安全,1991,(2):20~25
[42] Markuszewski R.and Wheelock T D.Elsevier,Process.And Util.Of High-Sulfur coal III,1990,745~748
[43]邓军,徐精彩,阮国强.国内外煤炭自然发火预测预报技术综述[J].西安矿业学院学报,1999,19(4):293~297,337
[44]邓军,文虎,徐精彩.煤自然发火预测理论及预测技术[M].西安:陕西科学技术出版社,2001
[45]查哈罗夫·EH.煤炭自燃的化学活性鉴定[J].工业劳动安全,1989,(7):38~39
[46]戚英敏.煤吸附流态氧的燃烧特性及在矿井火灾预测中的应用[J],煤矿安全,1994(9~11)
[47]罗海珠.煤吸附流态氧的动力学特性及其在煤自燃倾向性色谱吸氧鉴定法中的应用[J],煤矿安全.1990(6)
[48] Smith AC,Lazzara C P.In hibition of Spontaneous Combustion of Coal,Report of Investigation.United States[R].Bureau of Mines,Pittsburgh,PA,USA1988,41:1~4
[49]FengKK.Spontaneous Combustion of Canadian Coals[J].CIM Bulletin 1985,78(5):71~75
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