Experimental Study On The Relationship Of Radon Emanation And Mark Gases In The Process Of Coal Oxidation

Coal spontaneous combustion (sponcom) exists widely not only in China but also in other countries, such as America, Russia and Australia. A great mount of coal resource has been lost due to the coal sponcom, with the lost of 4.2 billion tons. Besides, the loss quantity has been increased by 10～13.6Mt every year. It is estimated that the economic loss, including potential loss, resulted from coal sponcom is more than 20 billion yuan every year. Not only does the coal sponcom wastes coal resources, but also leads to serious environmental and ecological problems. Moreover, coal sponcom has brought many disasters, such as gas and coal dust explosion. It is the harm to mine safety production.The early-predicted technology of coal sponcom and the detection of fire location are the key technologies in mine fire preventing and fighting. Presently, the mark gas analyzing method has been widely used in coal mines. The precise detection technique for the coal fire location of sponcom, which has been used for fire detecting, is a method developed recently and has been widely used in domestic and overseas. Its principle is that the radon emanation increased with the coal temperature rising. But there is no perfect theory for the transfer of radon and its daughters in the worldwide range. Therefore, Shanxi research center of safety engineering has built an experiment rig for coal spontaneous combustion & radon measurement to study the relationship of radon and temperature, radon and mark gases, in the process of coal oxidation.In order to research the radon transfer and testify the detection result of radon detection by using mark gases, this paper has designed experiments of coal oxidation in the use of the experiment rig. After many experiments, it has selected the representational data to analyze and study. Trough data fitting, the concentration distribution of radon and mark gases with the coal temperature rising has been received. It has found that the concentration of Rn, CO,CO₂ and CH4 has increased regularly, and the change tendency has correlation. Compared with several correlativity test methods, the thesis has selected fuzzy correlativity test method to analyze the experimental data of Rn, CO,CO₂ and CH₄, and has received the correlativity of Rn, CO,CO₂ and CH₄.