Coal fire is a dynamic process caused by spontaneous combustion of the coal layer in various directions, accompanied by the sensible thermal field variation both in time and in space. Using appropriate assemblies and sensors in different layers for effective identification, this paper has studied the technology for detection of underground coal fire. The test was carried out in Rujigou coal fire area of northern Ningxia on the basis of investigating coal fires and related physical features sensible to thermal detection. On such a basis, the effective and economical methods are proposed for the monitoring of underground coal fire.
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