The airflow state of the air outlet can not realize real-time dynamical change which leads to the problem of gas and dust disasters and pollution hazards under the total ventilation control mode in fully mechanized excavation face.The multi-source data fusion evaluation and analysis of the complex ventilation environment safety state under the coupling of airflow gas and dust can provide a theoretical basis for the fine intelligent control of airflow and prevent the occurrence of disasters and accidents.The finite element calculation model of gas-solid coupling of airflow gas and dust was established by fluid mechanics and discrete element coupling method.The experimental platform of airflow monitoring and intelligent control test was designed and built to verify the model,and the key hidden danger location was simulated and determined.The evaluation index system of three-layer structure was constructed by AHP,and the weight of each index was determined.A hybrid two-level fusion structure was used to analyze the optimal weighted data-level fusion and grey relational decision-level fusion,and an evaluation model with five-level was established.The fusion evaluation analysis of the fully mechanized excavation face of a coal mine in northern Shaanxi shows that under the extreme working condition of the shortest distance of 5 m from the air outlet to the end face,the evaluation grade is safe when the diameter of the air flow intelligent control device is 1 m,the horizontal deflection angle is 20°,and the vertical deflection angle is 6°.Compared with that before control,the gas volume fraction and dust mass concentration at different measuring points decrease to varying degrees,verifying the effectiveness of the model.
关键词
综掘面/风流智能调控系统/评价指标体系/多源数据融合/灰色关联分析/瓦斯体积分数
Key words
Fully mechanized excavation face/Intelligent airflow control system/Evaluation index system/Multi-source data fusion/Grey relational analysis/Gas volume fraction
维普
万方数据