Study On Operational Reliability Of The Coal Mine Drainage System And Development Of Control System

In recent years, in order to control the mine's disaster happened frequently,there are some effective approaches should be taken to improve the capacity of coal mining enterprises's safety to adapt the development of coal industry requirement. As one of the four component parts in coal mine system,the coal mine drainage system play an important role in normal production and has responsible for excluding the water which arise in the course of coal production. Therefore,studying the operational reliability is one of the great significant things about the coal mine safety production.Above all,according to some coal mine's raw data, a new approach that reference the mathematical model of reliability can be adopted. Base on the principle of economy and reliability when selecting and designing the drainage device can improve its operational reliability.Regulating valves are essential components in the centrifugal pump drainage system. It responsible for the pump station reliable operation, on the other hand could control the pump flow, and affect the system's operating characteristics. This study focus on the performance of regulating valve, and summarized the merits and drawbacks,and then this study propose that using the multi-function control valve for pumping system to replace the traditional regulating valves in coal mine drainage system. First of all, the structure and working principle of multi-function control valve for pumping system will be studied. and then,research the water hammer protection on the aspect of engineering fluid mechanics,theoretical proved that this valve have better water hammer protection capability than the ordinary check valve. At last, with the actual situation in coal mine drainage systems and Fluid Dynamics Analysis(CFD),this study simulate the valve's steady-state performance and dynamic performance simulation through using fluid dynamics simulation software--FLUENT6.2.The technology of dynamic mesh will be used in study dynamic performance.With the continuous development of automation technology in our country, appling the industrial control technology and communication technology to the coal industry have become an inevitable trend. Based on the choice of drainage facilities,we have developed the corresponding automatic control system in which the Siemens S7-300 series PLC as an on-site central control unit and the PC host computer with configuration software (Force Control 6.0) as an remote monitoring center,we also have designed the bus monitoring network which base on PROFIBUS-DP and TCP / IP protocol, achieved the drainage system real-time,accurate on-site control and remote monitoring.To increase the operation reliability of coal mines drainage system, the various interfering factors in the automatic control system been studied...