Design And Research Of Backwashing And Filtering System For Fully Mechanized Mining Face

In recent years,with the requirement of high efficiency,high yield.safety and the progress of science and technology in coal mine,the digitized fully mechanized mining face system has been gradually realized in domestic coal mine.The cleanliness of working medium is an important factor affecting the operation status of the system,so emulsion filtration is particularly important in the operation process of the working face system.Nowadays,the hydraulic system of digitized fully mechanized mining face puts forward higher requirements for hydraulic medium.During the long-term operation of hydraulic system,it is found that the cleanliness of working medium often becomes the key factor to detennine the stable operation of the system.Because of the bad working environment,the working medium of the hydraulic system will inevitably be polluted,which will affect the whole hydraulic system,so the filtering of the working medium is particularly important.According to the experience of using electro-hydraulic control system in fully mechanized mining face at home and abroad,it is an effective measure to ensure the quality of emulsified liquid to install backflow filter system on the pipeline of emulsified liquid backflow tank.Therefore,it is of great significance to design and study the backwash backwash filter system in fully mechanized mining face.Backwash backwash filter system is an important equipment to reduce emulsion pollution in fully mechanized mining face,which can significantly improve the cleanliness of the system in hydraulic system.Firstly,the pollution control technology is analyzed.Based on Darcy's law,the basic theory of filtration system is analyzed,the main performance parameters of filter are analyzed,and the formula for calculating filter cake pressure drop is deduced.Then the hydraulic system of the filter station is designed and calculated,and the main components are designed and checked.The three-dimensional structure model of the filter system is established.The three-dimensional flow field dynamics characteristics of the backwash filter cartridge are simulated and analyzed by using the fluid dynamics software FLUENT.Secondly,tlhough the analysis of the working principle and Application Research of cartridge main valve,the mathematical model of cartridge main valve controlled by pilot valve is established,and the simulation model of cartridge main valve is established by AMESim software,and its dynamic characteristics are simulated.The results show that the cartridge main valve designed has stable flow,fast response to opening and closing,and good flow-pressure characteristics in large flow situations.The whole hydraulic system is modeled and simulated by AMESim.The results show that the filter system can filter normally and flush backwards,and has good flow-pressure characteristics.At the same time,it can flush online synchronously without affecting the normal filtration process.Finally,through the field application and performance test of the prototype,the operation status of the backwash and backwash filter system designed for fully mechanized mining face is analyzed,which mainly includes three aspects:sealing and pressure endurance test,flow pressure drop test,forward filtration and backwash control test.The test results show that the system can operate normally and perform well,and can also be used.Realize synchronous online backwashing.