In view of the problem of abnormal continuous exceeding limits of CO in the upper comer of the goaf without any signs of spontaneous combustion during the normal stoping period in Dananhu No.l Mine,a ordinary temperature oxidation experimental device independently developed by Taiyuan University of Technology is used to conduct a study of ordinary temperature oxidation characteristics of the extracted coal sample of lignite.The results show that the lignite in Dananhu No.1 Mine can oxidize and release CO at ordinary temperature,and the related process can be divided into three stages:"rapid oxidation","slow reaction",and"reaction termination";when the environmental O2 concentration is ≥ 7.7％,the CO production rate of coal sample oxidation at ordinary temperature in Dananhu No.1 Mine shows a quadratic function fitting relationship with the environmental O2 concentration;the environmental CO concentration in the coal sample of Dananhu No.l Mine is closely related to the variation of O2concentration,showing a good linear function relationship;the early stage early warning index of coal spontaneous combustion in the process of lignite mining in Dananhu No.1 Mine must consider the normal temperature oxidation characteristics,otherwise the degree of severity of coal spontaneous combustion in goaf may be misjudged.
关键词
大南湖一矿/褐煤/常温氧化/CO
Key words
Dananhu No.1 Mine/lignite/ordinary temperature oxidation/CO
维普
万方数据