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    煤岩瓦斯动力灾害时期风流灾变研究进展

    Research progress on airflow catastrophe during coal-rock gas dynamic disasters

    • 摘要: 通过对井巷风流灾变运移规律、传感器优化布置、通风系统故障诊断、风网控风方法等研究的综述分析,提出建立灾源瓦斯涌出作用及瓦斯风压作用不同阶段的源项非稳态通风网络解算模型,为井巷风流灾变状态判识和控风方法决策提供数据支撑。采用元启发优化算法结合机器学习,生成适用于灾变风流监测的最优传感器布置方案,构建风流灾变状态动态判识模型,实现井巷风量-瓦斯浓度联合判识以及多点阻变诊断判识。将非稳态通风网络解算模型与通风网络调节方法动态结合,建立包括通风机、分支风阻、通风机-风阻联合调控的非稳态通风网络动态调控模型,实现对灾害时期风网协同控风的仿真分析。以减少受灾范围、防止分支风流逆转以及快速排出高浓度瓦斯为控风准则,提出基于条件分布采样的分段混合多目标优化方法对动态调控模型进行求解,为灾害时期最优控风方案决策提供手段和依据。最后搭建井巷风流灾变状态监测判识与协同控风实验系统进行验证,为解决灾害时期风流灾变状态判识与控制的科学难题提供理论指导。

       

      Abstract: Through a comprehensive review and analysis of research on the migration law of airflow catastrophe in mine roadways, optimal sensor placement, ventilation system fault diagnosis, and ventilation control strategies for ventilation networks, this study proposes a source-term non-stationary ventilation network calculation model for different stages of gas emission effect and gas pressure effect. The model provides data support for the catastrophe state identification of mine roadway airflow and the decision-making of ventilation control strategies. By combining meta-heuristic optimization algorithms with machine learning, an optimal sensor placement scheme suitable for catastrophic airflow monitoring is generated, and a dynamic identification model for airflow catastrophe state is constructed. This model realizes the combined identification of air volume and gas concentration as well as multi-point resistance change diagnosis and identification. Through the dynamic integration of the non-stationary ventilation network calculation model and ventilation network adjustment methods, a dynamic regulation model for non-stationary ventilation networks is established, including ventilator regulation, branch air resistance regulation, and combined regulation of ventilator and air resistance. This model enables simulation analysis of collaborative ventilation control for ventilation networks during disasters. Taking reducing the disaster-affected area, preventing branch airflow reversal, and rapidly exhausting high-concentration gas as the ventilation control criteria, a segmented hybrid multi-objective optimization method based on conditional distribution sampling is proposed to solve the dynamic regulation model, providing means and basis for the decision-making of the optimal ventilation control scheme during disasters. Finally, an experimental system for monitoring, identification and collaborative ventilation control of airflow catastrophe state in mine roadways is built for verification, which provides theoretical guidance for solving the scientific challenge of identifying and controlling airflow catastrophe states during disasters.

       

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