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为研究松散煤体内高温区域自吸氧过程的温度分布规律,分析氧气输运类型及影响因素,在此基础上研制高温松散煤体自吸氧试验装置,并利用该装置测试不同温度热源作用下的不同粒径松散煤体温度。发现松散煤体高温区自吸氧过程中氧气运输有宏观气流携带效应及氧组分浓度差引起的分子扩散效应2种类型;热源温度及孔隙率是影响松散煤体高温区自吸氧的主要因素。研究结果表明,该装置能用于研究不同温度热源作用下不同粒径松散煤体内温度分布;热源温度一定时,松散煤体内同一测点的温度值随煤体粒径的增大而升高;热源对其上方松散煤体内温度的影响明显大于对下方的煤体,热对流效应对松散煤体内热量传递过程有很大影响。
In order to study the temperature distribution law of spontaneous oxygen absorption in the high temperature region of loose coal and to analyze the types and influencing factors of oxygen transport, a self-priming oxygen testing device for high temperature loose coal was developed based on the analysis. The device was used to test the effect of different temperature heat sources The different particle size loose coal temperature. It is found that there are two types of molecular diffusion effects caused by the oxygen-bearing molecular entrapment effect and oxygen diffusion caused by oxygen transport in the high temperature zone of loose coal since oxygen absorption. The temperature and porosity of heat source are the main factors affecting the self-oxygen absorption in the high temperature zone of loose coal factor. The results show that the device can be used to study the temperature distribution of loose coal with different particle sizes under the action of different temperature heat sources. When the temperature of heat source is fixed, the temperature of the same measuring point in loose coal increases with the increase of coal particle size. The influence of heat source on the temperature of loose coal above it is obviously greater than that of coal underneath, and the effect of heat convection has a great influence on the heat transfer process in loose coal.