含油多孔介质热气流点火临界着火温度的理论研究

THEORETICAL STUDY ON CRITICAL INGITION TEMPERATURE OF HOT GAS FLOW IN POROUS MEDIA CONTAINING OIL

基于经典点火理论中的“零值梯度法” ,建立了含油多孔介质在采用热气流点火时临界着火温度的数学模型 ,并利用所得模型定性分析了一些主要因素对临界着火温度的影响。分析结果表明 ,增加热气流流量、比热及指数前因子、油层孔隙度、油密度、油饱和度、氧分压、反应级数和氧分子燃烧产生的反应热等参数值均会使临界着火温度降低 ,多孔介质中燃料活化能的增加则会使临界着火温度升高。

Based on the “zero gradient” method of classical ignition theory, a mathematical model for determining critical ignition temperature of hot gas flow in porous media containing oil is established. By means of this model, the main influencing factors on the critical ignition temperature are qualitatively analyzed. The results show that the critical ignition temperature will decrease with the increase of the flow rate, specific heat of hot gas as well as the values of frequency factor, reservoir porosity, oil density, oil saturation, oxygen pressure, reaction order and reaction heat produced by oxygen burning, and it will increase with the increase of activation energy of oil.