Analysis of Coal Mine Methane Development Technology in China

Abstract

This paper introduces occurrence characteristics of coal bed methane in China, and analyses the influence of coal seam permeability on coal mine methane extraction. In addition, it presents the mechanism of increasing permeability by pressure relief. Lastly, the methane extraction technologies are discussed, and the applicable conditions of these technologies are analyzed. It is seen that choosing appropriate methane drainage technology, often in combination with several technologies including ground drilling, underground drilling, and pressure relief and permeability improving measures, is crucial for geological complex coal seam, especially low permeability soft coal seam.

Application of Virtual Design and Manufacturing Techniques in Large Mine Elevator

“…According to the stress characteristic of the elevator, a few load brings to bear the model after the appropriate conversion, the exterior load in the friction gear comes from wire rope's static tension, every wire rope hangs on the friction pad on the friction wheel, Radial stress and friction transfers to the drum shell of the friction wheel through the pad. The pad changes line distribution load on it to surface distribution load on the drum shell [5].…”