The Jurassic coal of NW China has huge recoverable reserves but large spontaneous combustion tendency. Studying on spontaneous combustion mechanism of Jurassic coal is behind of the East and north of the Carboniferous Permian. Therefore, understanding the status of fire prevention of Jurassic seam of Northwest Region is of great significance to establish research orientation of spontaneous combustion of Northwest Jurassic mines and develop the theoretical system of spontaneous combustion. The paper summarizes Jurassic coal rock features of NW China, describes in detail its low temperature oxidation characteristics of spontaneous combustion and promotes the existing spontaneous combustion model to the Jurassic coal seams. In the end, further research on laboratory studies, numerical simulation and field practice of the Jurassic coal is recommended.
Abstract. According to the existing conditions of the fan installation, we used precision barometer equipment and static pressure method to make a performance test about anti-explosion extraction axial fan in East Two Shaft under the condition of no shut down. According to the parameters of the test, we drew the performance curve of output power, wind pressure, efficiency and air volume about main fans of East Two Shaft in Yaoqiao Coal Mine. By measuring the results and analyzing data, it indicates that the main ventilator is in a good performance to meet the needs of air volume of East Two Shaft. To ensure the safe and economic operation of the main fan, the corresponding improvement measures aiming at the existing shortcomings of the ventilation system of East Two Shaft are put forward. The test method and results of the ANN-2500/1250 fan performance test have certain reference significance for the test of the similar axial fan.
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