Dust Production Mechanism And Control Technology Of The Feeder And The Blanking Tube In A Coal Preparation Plant

The aim of this paper is mainly to study the main coal-dust pollution sources 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, dust precipitation mechanisms have been gained for the feeder and the blanking tube in Ping Shuo Cola Preparation Plant. Dust pollution of the feeder is caused by the positive pressure of the induced feeding wind-flow and the bad seal itself. Firstly, the durable flexible seal material is used to seal up the feeder. Secondly, the seal guide-chute with the dust collector is installed on the belt. Finally, the air volume and the pressure of the dust collector are determined by means of numerical simulation, and the reasonability of the plan is explained from the angle of the dust control mechanism. The dust pollution of the blanking tube is mainly from the jetting dust caused by the induced high-pressure wind-flow in the blanking tube and the splashing dust of the naked belt tail. The plan of the combination of the relative seal with the bag dust separator is used to control the high-pressure in the blanking tube. The plan of the combination of the seal cover with the ultrasonic sprayer is used to control the splashing dust of the naked belt tail. The main technical parameters of the dust control plan, such as the seal guide-chute length, and the air volume and the pressure of the dust collector, are determined through the numerical simulation. 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 certain similar business.