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一、综述 大家都已熟知通风所需的动力费是和风量的立方成比例的,如果把风量提高1倍则需要8倍于原来费用的动力费。同样如果矿井风量能降低一半,通风动力费可降低到原需费用的1/8。随着超过实际需要的多余风量的输送,通风动力赞成比例地增加。此外,选用不能在低负荷情况下运转的大规格风机也会造成通风动力费的极大浪费。 英国矿井通常是应用地面主扇排除工作地区的污浊空气进行通风的。主扇一般选用的规格都是按矿井开采长期需用考虑的。当矿井某些地区感到风量不足时,即安装井下辅助扇风机。 许多地面主扇风量为200米~3/秒以上,然而,只有60～80米~3/秒的风量对工作地点有用,其余的风量都在进风道和回风道中漏掉了。虽然有些漏风不可避免,但让过多的漏风存在或向井下无人工作地区继续通风,则是很明显的浪费。漏风主要发生在井筒地面风道封闭点和井底漏风点。这两处可漏掉70～120米~3/秒的风量。井下主要巷道不仅输送工作地点需要的风量,也输送漏风造成的多余风量。所以,井下主要风道断面是按包括漏风在内的全部风量设计的。 选用一台过大规格的风机,不装配能适应负荷变化的配套设备也会产生一系列的浪费。井下辅助扇风机可用来补足规格太小的地面主扇的能力。由
First, the review We all know that the required ventilation costs are proportional to the volume of the air volume, and if the air volume is doubled, you need eight times the cost of the original fee. Similarly, if the mine air volume can be reduced by half, the ventilation fee can be reduced to 1/8 of the original cost. With the delivery of excess air flow exceeding the actual demand, the ventilation power pro-rataly increases. In addition, the use of large-scale fans that can not operate at low loads can also cause significant waste of ventilation costs. The British mines are usually ventilated by the use of main fans of the ground to remove the dirty air in the work area. The main fan of the general specifications are used according to long-term mining needs to be considered. When some areas in the mine feel less than the amount of wind, the installation of underground auxiliary fans. Many ground fans have a fan capacity of 200m3 / s or more. However, only 60-80m3 / s of air flow is useful to workplaces and the rest of the air flow is lost in the inlet and return air ducts. Although some air leaks are inevitable, excessive air leakage or continued ventilation to unmanned underground work areas is a significant waste. Leakage occurs mainly in the borehole air duct sealing point and bottom hole leakage point. The two can miss 70 ~ 120 m ~ 3 / s air volume. The underground main roadway not only delivers the required air volume at work place, but also transports excess air volume caused by air leakage. Therefore, the main downhole section of the mine is designed to include all the air leakage, including air leakage. Choose a fan of large size, not equipped to adapt to changes in load supporting equipment will also produce a series of waste. Auxiliary fan downhole can be used to make up for the size of the ground floor main fan ability. by