Self-ignition propensity prediction; · Factor comprehensive evaluation prediction method; · Empirical statistical prediction method and mathematical model prediction method. 1. Self-ignition tendency prediction method Coal spontaneous combustion propensity refers to the degree of natural ignition of coal seams before they are developed. All coal types have a tendency to spontaneous combustion, but the spontaneous combustion tendency of different coal types and different environmental conditions is also different. At present, the more mature coal spontaneous combustion tendency identification at home and abroad, mainly including the Aussie method, the ignition point method, the intersection temperature method, the differential calorimetry method, the static and dynamic oxygen absorption method. 2. Comprehensive evaluation and prediction method of factors The comprehensive evaluation method of factors refers to the method of comprehensively scoring various internal and external factors affecting the spontaneous combustion of coal. The guiding ideology is: firstly, the self-ignition tendency of coal is identified and its score is evaluated; On the basis of a large number of statistical analysis, the external factors affecting the degree of natural fire hazard of coal are subjectively judged, and the scores are given. The sum of the two is combined to obtain the total score of spontaneous combustion of coal under the corresponding conditions and classification. 3. Empirical statistical forecasting method The empirical statistical forecasting method predicts the index parameters such as the natural fire hazard degree of the mining coal seam under similar conditions by statistical analysis of the existing natural fire accidents. The method is based on a large amount of statistical data and is formed on the basis of analyzing the cause of fire. It is quite credible, but it is difficult to predict the spontaneous combustion of different types of ignition, and there is a large deviation in time statistics. It is only possible to roughly judge the range of dangerous areas of spontaneous combustion. 4. Mathematical model prediction method Mathematical model prediction method refers to the mathematical model of spontaneous combustion of coal, and the experimental simulation and numerical calculation of coal spontaneous combustion process, and the value of natural ignition hazard of coal body under different boundary conditions is obtained. Auto Parts Used For Joylong Hiace Engine Hood,Joylong Hiace Car Door,Joylong Hiace Tailgate Rear Door,Joylong Hiace Engine Hood Baoying Shuguang Auto parts Factory , https://www.shuguangautoparts.com