Virtual Simulation System For Dense Medium Coal Preparation Process Control

Coal is an important part of energy resources in China.If a large amount of impurities cannot be removed from raw coal in time,it will not only seriously affect the efficiency of coal utilization,but also discharge massive pollutants.Coal preparation is one of the key technologies in clean coal production,among which dense medium coal preparation has been widely applied because of its advantages in low density sorting,convenient operation,high sorting efficiency and easy control.With the increasing demand for coal quality,more and more advanced control algorithms of DMCPP(dense medium coal preparation process)are essential to ensure the optimal operation.The simulation experiments for DMCPP control algorithm are mainly carried out in two ways.One is to conduct physical experiment through actual plant or self-built small scale physical plant.However,the above method covers a large area and brings high cost.More importantly,there is a certain risk of misoperation in the operation process,which is prone to result in resources waste.The other is the numerical simulation experiment,but its visualization degree is poor.Besides,it is difficult to reproduce the actual industrial production scenes.To make algorithm researchers and field engineers to better study the advanced control algorithm for DMCPP,this paper developed a virtual simulation system for DMCPP control by using virtual simulation technology.Moreover,a advanced control algorithm for DMCPP is developed to verified the usability of virtual simulation system.The main contents of this paper are as follows:(1)To provide a safe and economical environment for visual analysis of simulation results of DMCPP,this paper firstly designs the overall function,and then proposes the overall framework for virtual simulation system of DMCPP.(2)The DMCPP,which composed of the mixture barrel,dense medium cyclone,medium draining screen,magnetic separator and qualified medium barrel,is modeled according to the materials balance principle.Besides,a model solver is designed using fourth-order runge-kutta method.Meanwhile,to provide a virtual interactive environment of DMCPP,the 3D visualization model of DMCPP is built by 3ds MAX and the visual dynamic virtual interactive scene of DMCPP is built by Unity3 D,which provide a virtual interactive environment with researchers.(3)The control algorithm simulation and compilation environment of the system is built based on Matlab whilst the 2D and 3D display effects of simulation data are realized by the visual analysis interface of simulation results for system designed by the NGUI and UGUI development tools of Unity3 D,which facilitating the interaction and analysis of visual simulation results by researchers.(4)A stable multi-objective economic model predictive control of DMCPP is designed by the study of control objectives and difficulties on DMCPP.The proposed method is finally tested by the developed system to verify the effectiveness and usability of this system.