地下煤火高温阶段贫氧不完全燃烧耗氧速率的计算  

An approach to calculate oxygen consumption rate of underground coal fires with lean oxygen concentration and incomplete combustion at high temperature

作　　者：宋泽阳[1,2] 朱红青[1] 徐纪元[1] 秦晓峰[1] 张振[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]德国宇航中心遥感数据中心,慕尼黑82230

出　　处：《煤炭学报》2014年第12期2439-2445,共7页Journal of China Coal Society

基　　金：国家留学基金委对笔者在德国宇航中心开展的"中国北方煤火多光谱遥感探测及危害评价"留学项目的经济资助

摘　　要：运用过量空气系数、动力学反应和供氧的时间尺度,分析了地下煤火不同温度阶段的燃烧状态。在高温阶段,地下煤火燃烧反应速率很快,巷道和裂隙漏风所供给的氧含量不能满足煤体燃烧所需的氧含量,煤体燃烧耗氧速率受控于氧气供给速率,地下煤火处于贫氧不完全燃烧阶段。根据S.Krishnaswamy提出的单颗煤粒动力学反应-扩散模型,推导了地下煤火高温阶段贫氧不完全燃烧状态下耗氧速率计算式,并运用案例数值模拟分析和验证了该计算式。结果表明,该式能有效地估算地下煤火高温阶段受控于供氧速率的耗氧速率。air-fuel equivalence ratio and timescales of kinetic reaction and oxygen transport were used to analyze the combustion of underground coal fires at different temperature stages. At high temperature stage,due to the fast rate of kinetic reaction,oxygen concentration transported from galleries or cracks was lower than that required by theoretical kinetic reaction. Thus the oxygen consumption rate of coal combustion was controlled by oxygen transport rate and the coal fires were incomplete combustion because of lean oxygen concentration. According to the Single-Particle ReactionDiffusion model proposed by Krishnaswamy,a formula to estimate oxygen consumption rate of underground coal fires with lean oxygen concentration and incomplete combustion at high temperature was developed. A numerical case study was conducted to analyze and examine the proposed formula. The investigated results show that the proposed formula can effectively estimate oxygen consumption rate controlled by oxygen transport at high temperature.

关 键 词：过量空气系数 时间尺度 燃烧状态 动力学反应 

分 类 号：TD752[矿业工程—矿井通风与安全]