3 Face Ventilation.pptxVIP

Face VentilationOutlineIntroductionLine BratticeAuxiliary FanNew Words and ExpressionsObjectives通过学习，熟记face、entry、crosscut、brattice、auxiliary fan、heading 、blowing (or blower）system、exhaust system、methane buildup等专业词汇，达到英文与中文相互熟练翻译的程度；深入理解Line Brattice、Auxiliary Fan，达到熟练阅读和正确、通顺地翻译的程度。1 IntroductionUnless the air is properly distributed to the working face, the mine ventilation system is not performing its primary function. While it has always been recognized that this last part of ventilation is the most import, it is also the most difficult to achieve.除非给工作面分配了合适的风量，否则矿井通风系统就没有完成它的主要任务。虽然人们普遍认识到通风的这个最终任务是极其重要的，但是要完成这个任务也是极其困难的。1 IntroductionThere are basically two methods of ventilating the blind entries ahead of the last open crosscut: the use of line brattices or the installation of auxiliary fans. Each technique has its defenders as well as its outspoken critics.对最后一个连通石门前的独头平巷进行通风，有两种主要方法：使用纵向风障和安装局部通风机。每一种方法都有它的优点和缺点。注：defenders（防御者）引申为优点; outspoken critics（坦率地批评）引申为缺点。2 Line BratticesThe line brattice is essentially a space divider or temporary partition made of an impervious material that is installed and maintained very carefully and kept as close to the face as possible. Its purpose is to guide the airflow through the face area and last open crosscut and into the return. Brattices were formerly made of untreated jute, but nylon reinforced plastics and similar materials are more commonly used in them today. While the more effective material is invariably higher in initial cost, it results in lower overall expense in that it allows for greater reuse and less air leakage.纵向风障实际上是一种用不透风材料制成的间隔物即临时隔板，它要细心安置、精心维护，并使其尽可能接近工作面。纵向风障的用途是引导风流流经工作面区域和最后连通石门后，进入到回风流中。以前，纵向风障是由未经加工的黄麻制成的，但是，现在人们普遍使用尼龙加固塑料和类似的材料来制成风障。虽然这种效果较好的材料使初期成本总是较高，但是它导致总体费用下降，这是因为考虑到它能够多次重复使用，并且漏风较少。2 Line BratticesThe line brattice is installed so as to split the heading longitudinally and thus provides an inlet as well as a return from the face to the last open crosscut. Since the mining machine