专业英语L3.ppt

With as little as 306.8 L/s of air from 15 cm-diam tubing directed toward the face, it is possible to provide an air flow of 1005 m/min in the far corner of the face and effectively force contaminated air into the larger air volume circulated by the exhausted fan. 该系统在直径15厘米的管道中产生的306.8L／s风流直接流向工作面，这就可能使工作面远而偏的隅角处风流速度达到1005 米／分，有效地迫使污浊空气流入到由抽出式风扇循环的体积较大的气流中。 By circulating 1888 L/s through a 30 m length of 90 cm tubing, methane liberation of up to 18.9 L/s have been safely handled. With this system, recirculation can occur during normal operation if the exhaust tubing is allowed to lag behind, and thus the end of the tubing should always be kept well ahead of the inlet to the diffuser fan. LESSON 3 Face Ventilation By circulating the exhaust tubing is allowed to 1888 L/s through a 30 m length of 90 cm tubing, methane liberation of up to 18.9 L/s have been safely handled. 使1888 升／秒的风流循环流经长度为30米，直径为90厘米的管道，涌出量达到18.9 升／秒的瓦斯得到了安全处理。 With this system, recirculation can occur during normal operation if the exhaust tubing is allowed to lag behind, and thus the end of the tubing should always be kept well ahead of the inlet to the diffuser fan. 如果抽出式风扇风筒滞后，使用该系统，在正常生产期间可能会形成循环风流（回流），因此应经常保持抽出式风筒入口超过稀释风机进风口。 Also, if the exhaust fan stops for any reason, and the machine continues to operate, recirculation will occur around the diffuser fan with possibly a dangerous accumulation of gas. LESSON 3 Face Ventilation 同时，如果抽出式风扇由于某种故障停止运行，并且采煤机继续在运行，那么就会在扩散式风机附近产生循环风，并可能产生瓦斯聚集，这是很危险的。 Questions 1. When using line brattice for face ventilation, what are the advantages and disadvantages of blowing system and exhaust system? Which system is rare used toady? LESSON 3 Face Ventilation Questions 2. When using auxiliary fan for face ventilation, what are the advantages and disadvantages of blowing system and exhaust system? Which system is rarely used toady? Assignment 课文翻译作业1：全文翻译LESSON 3 Face Ventilation  LESSON 3 Face Ventilation LESSON 1 Introduction to Mine Ventil