Numerical Simulation Study On Dust Pollution Mechanism And Control Technology Of Coal-falling Tower In Open Coal Storage

The aim of this paper is mainly to study the main coal-dust pollution sources-a coal-falling tower in the four coal preparation plants of Ping Shuo Branch of China National Coal Group. Through the combination of many measurement data with numerical simulation of gas-solid two-phase flow, using a numerical simulation software to analyze dust precipitation mechanisms and dissipation laws of coal-falling tower in a open coal storage. Dust pollution of the coal-falling tower is caused by the induced feeding wind-flow with itself, when falling coal, which is called the first induced feeding wind-flow. When the coal falling , it was accelerating with the action of acceleration, on the surface of high-speed coal falling formed negative pressures, so have the second induced feeding wind-flow from the leak of the mouth and the wall of the coal-falling tower. The first and the second induced feeding wind-flow are stack up to form the high-pressure air in the coal-falling tower. With the falling coal on the mouth of coal-falling tower, the dust with the high-pressure air is poured forth. In the view of this situation, the coal dust removal technology that decorated joint fan and spray tower is proposed. Through establishing the multiphase flows mathematical model based on induced flows mechanism, by using the method that is called Lagrange numerical simulation, and find out the influencing factors of the dust removal efficiency and quantitative analysis it. The simulation result and the actual result verify the above dust control plans. The study methods and results provide a guide for the dust control in a open coal storage, such as each big mining areas, coal-fired power stations, chenical plants.