1、翻 译部分英文原文On the long wall of coal dust control Robert and George IntroductionSince the 1969 Federal Coal Mine Health and Safety act passed, the PBM has been actively exploring the coal dust inhalation. Until a few years ago, the main research project is to develop and improve the dust of the new tec
2、hnology, reduce respirable dust miners and the continuous mining method, and so on. Since the PBM, the Mine Safety and Health Administration (-MSHA), in the coal industry to reduce dust has made significant progress, have from 500 to 1969 mg / m decline now less than 2 mg / m 3. These things reflect
3、 the recent help-MSHA published volume. According to data showed that at least 95 mining and traditional departments had been in compliance with the Federal Coal Mine Health and Safety act. While this is a remarkable achievement, but several types of mining is the main longwall mining method, very d
4、ifficult to comply with the existing 2 mg / cubic meters of federal standards. Under normal circumstances, more than 50% over the long wall of standards, of which about two-thirds of the double-drum cutting coal. Thus, in the past few years, respirable coal dust of the key issues that has been long
5、wall coal dust problem to a greater use of this method of mining. This trend is due to the need to increase productivity to meet the ever-increasing demand for coal. Unless the development and implementation of effective control of dust, otherwise, people will not aware of this potential and efficie
6、nt method of mining coal dust problem. PBM successful research shows that the cost-effectiveness of the project is the development level of longwall operations to reduce coal dust. Moreover, a more accurate monitoring equipment to alleviate this problem is very effective. Set up monitoring equipment
7、 usually four to six feet face angle to maximize the drum to avoid interference. Concentration monitoring and no-screen display in the show from 1950 to 1960 at this stage can reduce operator exposure to coal dust China. Conveyor screenOverall, the long wall of the drum coal dust exposure is the mai
8、n reason for the machines themselves. Dust the surface of coal dust to a large extent depend on how quickly spread. The conveyor belt will screen on the machine itself can raise the air clean and facilitate the operation of the drum position.An effective monitoring screen conveyor four longwall mini
9、ng operations control. Under normal circumstances, when the shearer cutting coal, a decrease of coal dust inhalation depends on the operators location. instantaneous measurements show that the coal dust and coal dust need to be used in isolated areas. However, most of the roller operator for the ins
10、tallation of a screen, which will further reduce the access to the machine next to coal dust. Reasonable placed water guns will discuss in the next section. Improve waterMain method is the use of water to control coal dust. The right quantity and quality of water to a sound water-saving sprinkler sy
11、stem, can effectively control the longwall mining of coal dust. Many operators, in the absence of reasonable water supply system, leading to the drum coal dust can not be effectively controlled. Optimum waterImprovement of the main water supply system can be reduced greatly longwall face of coal dus
12、t. Through the following : (a) the ability to increase pump flow rate, pressure, (2) Improved pipeline models of the reduction in the amount of pressure loss, the failure to reduce maintenance, (3) installation of a filtration system to improve water quality. Best water system should include three o
13、r four-inch-diameter transmission line booster pump to provide 1,000 Palau pressure. Hard water underground pipe should be at least 1 - 1 / 2 inches in diameter. These lines of the proposed models to meet the water flow, pressure to improve. Good use of the filtration systems and water quality impro
14、vement is a prerequisite for effective dust sprinkler system. The bureau has developed such a filtration system. The system important component part of a business may make 1 / 8 feet reduced to 60 mg / m 3. The system should be installed in a flow meter and pressure gauge with the end of the water s
15、upply pipe. Drum sprinkler systemMining Bureau study shows, roller operator coal dust inhalation of coal dust to a large extent depends on how quickly spread. On the water in the drum may reduce coal dust in a significant role because the water gun to put drum near the coal dust removal. Simple, the
16、 sprinkler system, in particular nozzle think there will be more coal dust stirred up even more than they removed more. This research result has been called a roller cleaners, a new type of sprinkler system of the development of new sprinkler system CHOW Wai air pollution clean out. Dust is near the coal face, and the roller operator to stay in cleaning machine beside. The hardware is cheap, simple to install mobile. It inc
