Research On Lead-zinc Mine Ventilation System Meng Waxy Comprehensive Evaluation Model Based On Gray-level Analysis

Mine Ventilation System consists of several subsystems of ventilation network (including each roadway and its airflows, ventilation structures and all kinds of places with the wind), ventilation power and its attachments, airflow monitoring and control facilities etc. and its unit is consisted with large complex correlative system. Mine ventilation system plays an important role in safe operation in the design, construction, operation and management in all phases of the mine. In order to meet the request of reliable in safety, feasible in technology and reasonable in economics, it’s needed to comprehensively evaluate and analysis the safety of mine ventilation system.This study was based and expanded on the "Mine Ventilation System Optimization Design of Mengnuo lead-zinc, Yunnan Yongchang Lead and Zinc Co., Ltd.". The purpose of this paper was to carry out some theoretical studies of safety assessment in integral parts of the underground ventilation system, reach for the adjustment of the system to make the right decisions. The complexity of the mine ventilation system specific performed in multi-link, nonlinearity, time-varying and serviceability. The strong coupling between the factors and their associated attributes were fuzziness, gray and hierarchy. Did the following in-depth study based on the properties of the mine ventilation system, and in the fully draw on the basis of existing research results.1. Comprehensively reviewed the research status in safety evaluation of mine ventilation system in and aboard, and elaborated methodology and different building-indicators in safety evaluation of mine ventilation.2. Detailed described the evaluation theoretical system through the integrated use of AHP, gray system theory and fuzzy mathematics. Proposed grey hierarchy evaluation model combined with grey evaluation and analytical hierarchy process in mine ventilation.3. According to modern theory of system security and human, environment, management analysis method, built4units including system environment B1, ventilation facilities B2, technical staff B3and security management B4of ventilation system, as well as25indicators of multivariate and multilevel index evaluation system.4. Applied AHP to determine the weighting of each index in security evaluation system of mine ventilation system. Used grey relational analysis model to make gray relationships qualified, ordered and manifested. Constructed gray relation matrix and comprehensive evaluation matrix, and used fuzzy comprehensive evaluation conducting three-grade comprehensive evaluation. The qualitative and quantitative system evaluation method could solve a lot of the existing connotation and extension problems of fuzzy concepts which were not clear in mine ventilation. This was a simple and effective method of evaluation and decision-making.5. Conducted a comprehensive scientific evaluation in mine ventilation of Mengnuo lead-zinc, Yunnan Yongchang Lead and Zinc Co., Ltd. It came to a conclusion that the mine safety level was consistent with the actual situation.Examples showed that this kind of evaluation method was a more objective evaluation of the merits of the mine ventilation system. Qualitative and quantitative is pointed out that the priorities of the rectification work. Applied to the engineering practice, has the feasibility and engineering practical value.