| Mine ventilation intelligence is an inevitable trend for the future development of mine ventilation,while real-time diagnosis of ventilation system abnormalities is the key to realize mine ventilation system intelligence.For the purpose of studying the abnormal diagnosis of ventilation system in Zhangshuanglou coal mine using the temporal and spatial characteristics of dampers pressure difference,the research work of this thesis was carried out by using theoretical analysis,simulation,experimental testing and field verification.(1)In order to further realize the optimal arrangement of sensors and the study of abnormal diagnosis reasoning of mine ventilation system,a fault tree of mine ventilation system is constructed,in which the fault tree is established based on the analysis of mine ventilation system composition,characteristics,common abnormal sources and causes,and combined with the current situation of ventilation system of Zhang Shuangluo coal mine,which can realize the accurate identification of weak links of the system from the fault tree of mine ventilation system and provide It provides a theoretical basis for the optimal arrangement of sensors and the inference diagnosis and identification of abnormal sources and causes of the ventilation system.(2)In order to obtain more accurate monitoring data of the differential pressure of the dampers,an optimal arrangement method of the sensors based on the sensitivity of the dampers in the sub-region is proposed,taking into account the distribution characteristics and sensitivity of the dampers in the underground of Zhangshuanglou coal mine.At the same time,the VSE simulation software was used to simulate and verify the feasibility,and the method was used to achieve the optimized arrangement of the differential pressure sensor of the underground dampers in Zhangshuanglou coal mine.(3)In order to obtain more accurate diagnosis results of mine ventilation abnormalities and avoid the interference of "pseudo-abnormal" data,the interference characteristics of the downhole equipment operation and cage operation on the differential pressure of the dampers were conducted,revealing that the downhole "piston effect" has certain interference characteristics on the differential pressure of the dampers.Therefore,it is necessary to introduce certain time range restrictions to reduce the "pseudo-anomaly" data and obtain more "trueanomaly" data to improve the accuracy of the anomaly diagnosis results.(4)In order to further obtain the temporal and spatial characteristics of the dampers’ differential pressure under different types of ventilation system anomalies and use them for system anomaly diagnosis,a set of mine ventilation anomaly diagnosis experimental system was built.Among them,the experimental system is used to obtain the laws of temporal and spatial characteristics changes of dampers pressure difference under the abnormal state of ventilation network,ventilation facilities,ventilation power and various ventilation systems,and to summarize the setting of ventilation system abnormality diagnosis criteria,and to realize the inferential diagnosis analysis of ventilation system abnormal sources and causes by combining with the inferential analysis method.(5)In order to verify the feasibility of the proposed theoretical method and experimental results,further on-site industrial test cases were conducted to verify the ventilation system of Zhangshuanglou coal mine,and the feasibility of the theoretical method and the reliability of the experimental results law proposed in the thesis were analyzed from the industrial test results.The research results of this thesis are of great significance to the intelligent construction and daily management of ventilation in Zhangshuanglou coal mine,and also provide theoretical basis and technical support for the study of abnormal diagnosis of mine ventilation system.The thesis contains 71 figures,7 tables and 83 references... |
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