不同灾变条件下矿井胶带火灾烟气蔓延规律研究

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中图分类号：TD752 文献标志码：A

Abstract：At present，research on mine belt fires mainly focuses on the distribution characteristics of the temperature field，theevolutionofsmoke concentration，and thequantificationof critical wind speed instraight roadways.However，there isstillalackofsystematic investigationintothecoupling characteristicsoftemperature field，COconcentration，visibility，andcriical windspeedintheinterconectedlayoutofthemain transportation roadway and the auxiliary connecting roadway，which makes it diffcult to provide comprehensive support for safe evacuation and ventilationcontrol incomplex belt fires.To address this problem，a fire simulation model was established using Pyrosim software.Visibility，temperature，and CO sensors were installed atdiferent positions and heights to explore the dynamic evolution offire-related environmental parameters such as CO concentration， temperature，and visibility in themain transportation roadwayand the auxiliaryconnecting roadway.The study also revealed the dynamic coupling mechanism between harmful gas diffusion and environmental parameters withinroadways during belt fires.Theresults showed thattheroadway wind speed hadasignificant impacton the direction and speed of smoke spread. The critical wind speed for the simulated fire source was 2.5-3.5m/s When theroadway wind speed was low，a large amount of smoke was generated and accumulated due to incomplete combustion of combustibles.When the wind speed was lower than the critical wind speed，smoke backflow occurred. At a wind speed of 1.5m/s ， the maximum CO volume fraction and temperature appeared on the windward side， reaching 1 515.5×10-6 and 143.5∘C： ， respectively， and the proportion of low visibility was also highest at this wind speed. Smoke backflow could be completely suppressed when the wind speed exceeded 3.5m/s

Key words： belt fire; smoke spread pattern; visibility; temperature; CO concentration; roadway wind speed

0 引言

矿井火灾是矿井五大灾害之一，外因火灾占比约 65%[1] 。（剩余12806字）