外文翻译---浅析煤自燃火灾的原因、预报技术及防治措施(编辑修改稿)

外文翻译---浅析煤自燃火灾的原因、预报技术及防治措施(编辑修改稿)内容摘要：

ology forecasting underground spontaneous bustion fire, such as infrared thermometer and infrared thermal imager to detect the coal wall, coal pillar and float coal heap of spontaneous bustion, which use infrared detectors Michele Levin 44 and Punuobeiai infrared thermal imager。 British use 649 infrared imager and improved type 8 MEL1045, type DC thermal imager。 former Soviet Union using the infrared radiation Kawa Si for the indicator. The tests showed that infrared technology for measuring the spontaneous bustion of the coal pile, outcrop, Lane wall of coal pillar is very effective, but it can only detect the temperature of the surface and vertical instrument objects, but also for the middle occluder, therefore, are not adapted to the roadway loose coal within or adjacent goaf internal temperature detection. The substance of the infrared detection method is the nature of any object at absolute zero (0 K) on top of their own external infrared emission. The emission energy to the following equation 4ET Where: εradiation coefficient, the value of 0 ε 1, the rock and coal mass is generally ～ , the radiation coefficient by objects chemical position, surface state, internal structure, water content, porosity。 αStephen Boltzmann constant, (1012cm2)K4。 Tobject is the absolute temperature, K. It can be seen from the above equation, the higher the temperature of an object, the greater the radiation energy, infrared thermometer to accept the amount of radiation and convert the radiation temperature higher, so you can use the infrared thermometer temperature highresolution detect underground tunnel spontaneous bustion position. Under normal circumstances, the nature of infrared radiation area is 61k (89 ℃ ) to 207 K (66 ℃ ), the wavelengths in the 8 ~ 14μm atmospheric window region. Infrared technology to detect the infrared radiation of the surface temperature, which differs from the physical temperature, the infrared radiation of the surface temperature depends on the material position of the surface physical 9 temperature and its objects, moisture content, surface roughness, grain size, porosity, thermal inertia (specific heat, thermal conductivity, specific gravity), and many other factors。 either a small change in these factors will cause temperature changes of infrared radiation. Therefore, the exclusion of confounding factors, the extraction of the same substance, temperature anomaly information is critical. 2) Temperature sensor: The temperature sensor thermal resistance, thermocouple, AD590 temperature sensors. Thermal resistance and the working principle of the thermocouple is a thermoelectric effect. Prediction roadway loose coal may get angry regional and hightemperature point in the production of spontaneous bustion higher risk of regional buried thermocouple probes, remote continuous detection of the temperature of the roadway of loose coal, and to study the temperature distribution and temperature change the law. This approach has to predict a reliable, intuitive, but the point contact, forecast a smaller range forecast, installation, maintenance workload, especially in the probe, leads easily damaged. Gas analysis, temperature detection, and gas temperature monitoring objectives and forecast indicators of the safety monitoring system and beam pipe monitoring system are realtime monitoring and prediction, the premise of its forecast of coal selfheating or spontaneous bustion. Magic probe method The substance of the magic detection method, the coal seam overlying rocks generally contain a large amount of siderite and pyrite nodules, coal seam spontaneous bustion when the overlying rocks are baked at high temperature, the iron position of the physical and chemical changes, the formation of a magic material, and retain a strong magic. After baking the magic 10 properties of the overlying rocks with enhanced spontaneous bustion temperature increases. Electrical prospecting coal fire area in the 1960s, China39。 s northwestern provinces, bined with magic method has achieved some results. India is also the method has been applied to determine the spontaneous bustion of Jharia coalfield fire area range, have been very satisfied with the results. Russia, Ukraine also use this method to determine the scope of coalfield spontaneous bustion area. To see the essence of this method and applications, the magic detection method is mainly used for coal fire area, less spontaneous bustion heat detection applications for the production of the mine, this is mainly because: ① When spontaneous bustion in the temperature is less than 400 176。 C and baking time is short, the overlying rock or coal seam can not form magic high。 for the production of the mine, to deal with the spontaneous bustion of coal hightemperature region, since the lower coalfired temperature and baking time is short, so the effect of magic surveying is not ideal。 ② For the production of the mine, the downhole temperature around the area of iron substances, magic detection rules can not effectively use. The uneven the ③ coal seams and coal in the distribution of iron tuberculosis, bring some difficulties to the magic measurement method to detect spontaneous bustion area. Resistivity probe method [2] Under normal circumstances, buried in the underground coal seams, along the strike (or other direction) because of its structural state and water content changed little, the resistivity remained basically unchanged. But when the coal spontaneous bustion, the structural state of the coal seam and the water content of large changes, causing changes in the resistivity of the coal seams and surrounding rock. In the early stages of spontaneous bustion, the resistivity will decrease。 late 11 spontaneous bustion of coal than the full burning, it。