煤炭自然发火产生明火燃烧的分岔分析  

BIFURCATION ANALYSIS OF TRANSITION TO FLAMING OF COAL SPONTANEOUS COMBUSTION

作　　者：梁运涛[1,2] 贾宝山[3] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]煤炭科学研究总院抚顺分院煤矿安全技术国家重点实验室,辽宁抚顺113122 [3]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000

出　　处：《工程热物理学报》2009年第4期695-698,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50574049);中澳科技合作特别基金项目(No.50711120370)

摘　　要：基于煤氧复合作用学说,建立了炭粒填充床燃烧的数学模型,研究了炭粒自然发火发生明火燃烧的分岔特性,揭示了炭粒由自燃发生明火燃烧本质上属于气相反应。在气相反应区,忽略多相反应区的影响,应用数值分岔理论,以Frank-Kamenetskii参数为分岔参数对气相着火-熄火的发生进行了分岔分析,指出了炭粒自燃向明火转捩的分岔曲线包含稳定的着火分支、熄火分支及非稳定状态分支共三个分支,分析了其着火和熄火的非线性特性,得出了发生气相反应的条件,并探讨了方程中的其他控制参数对炭粒发生明火燃烧过程中着火-熄火分岔特性的影响。In this paper, based on the theory of reaction of coal and oxygen, the numerical model is presented for the coal combustion in the packed bed by theoretical analysis. The bifurcation characteristic of transition to flaming of coal spontaneous combustion is studied in the packed bed. For the transition to flaming of spontaneous combustion, in fact, it is gaseous-phase reaction. In the gas- phase reaction zone, the effect of heterogeneous reaction is neglected. Under the bifurcation theory, selecting the Frank-Kamenetskii parameter as the control parameter, the bifurcation characteristics of ignition and extinction of coal spontaneous combustion are detailed discussed and analyzed. The computed results show that the bifurcation curve is composed of steady ignition branch , steady extinction branch and unstable steady branch of coal. Then, the nonlinear properties are discussed for the ignition-extinction of solid phase and gaseous phase. At last, the condition that gas reaction taken place is concluded. Moreover, the effects of other parameters are studied on the bifurcation characteristics of the ignition and extinction of flaming combustion.

关 键 词：煤 自然发火 明火燃烧 分岔理论 着火-熄火 

分 类 号：TD752.2[矿业工程—矿井通风与安全]