安全工程专业英语翻译

安全工程专业英语翻译内容摘要：

od of auxiliary ventilation during development is the necessity of frequent extension. The auxiliary airstream must be delivered as dose to the face as possible so that it can sweep away any impurities that have been generated. The two main methods of ventilating the faces of deadend workplaces are erecting linebrattice (air entering on one side of the brattice and returning In the other side) and the installation of a fan, coupled with ventilation tubing. The practice of redirecting the main ventilation system with smaller, local fans is used where a line brattice is not adequate. Tubing, often suspended from timbers or roof bolts (if approved), carries the air to, or away from, the working face (tubing is rigid for exhaust systems and collapsible for forcing systems). This auxiliary ventilation system allows continuous miners to operate without being obstructed by brattice constructions. In addition, booster fans can be located in long airways to boost the airflow volume. These fans can be freestanding and used without using bulkheads. CIRCULATION CONTROLS Mineventilation systems present a unique challenge in that the workfaces are normally moving away from the source of fresh requires continuous changes to the ventilation system. These controls are needed to distribute the air underground, so that each working section Is ventilated with an adequate supply of fresh air. The various devices work collectively to direct the movement of the air through the main Intakes to the working section and move out through the returns without shortcircuiting, which occurs when air from the intake goes directly into the return. ELIMINATING DIESEL EMISSIONS As Mr Bear mented above, reducing harmful diesel emissions is another vital aspect of improving underground working conditions. But, while dieselengine manufacturers a。