一、前言局部抽气通风系统的成功应用,取决于抽气罩是否紧靠近放散源和消除周围干扰气流的程度。如果不能靠得很近,则局部抽气的效率会迅速下降。干扰气流通常是由于全面通风、补风、降温风机,以及设备运转和人的行走所产生的。在这种情况下,为了减少污染物放散到工作区,可以采用更为有效 I. INTRODUCTION The successful application of the local exhaust ventilation system depends on whether the suction hood is close to the source of emission and how much the surrounding disturbance air flow is eliminated. If you can’t get close enough, the efficiency of local pumping will drop rapidly. Interference airflows are usually caused by full ventilation, supplemental wind, cooling fans, and equipment operation and people walking. In this case, in order to reduce the emission of pollutants to the work area, more effective