The Study Of Dynamic Evolution Law Of Explosion Induced By Fire And Its Pervention And Control Technology

The study of explosion induced by fire and its prevention and control in coalminewere significant on the inhancements of disaster prevention, fight calamities andemergency rescue and decision-making. This dissertation studied the exlosion lawinduced by fire, pre-warning, reliability identify and disaster prevention and control incoalmine based on the related therories. The mathematic model of gas explosionduring fire sealing was set up and verified. Positive pressure ventilation of coalminewas unfavorable to detect fire zone and discover spontaneous combustion earlier. Iflarge reduction of air quantity occurred, the gas accumulated in the upwind of the firesource was explosive. During gas explosion, a negative pressure area would appearnear blast source at first and then shock wave came into being later. The selectivestandard of indicated gases was analyzed and the emendation technology of carbonmonoxide indicated gas was obtained. The pre-warning technologies of coamine fireand gas explosion accident were analyzed. The multilayer integrated pre-warningindex system of gas explosion was constructed and the synthetical index evaluationmodel of gas explosion hazard was set up. The index were quantified and the hazardand pre-warning state of gas exlosion were classified. Then, the synthetical indexevaluation model was verified. The effectiveness assessment method of fire zonesealing, the sixteen rules of information collection of fire zone gases and the judgment technology rules of combustion state in fire zone were proposed. Based on the gravitycurrents and jet fluid, the critical pumping inert gas in order to prevent explosion infire zone sealing was deduced and verified by experiments.