Aircleanersforparticulatecontaminants..doc

Air cleaners for particulate contaminants (微粒污染物的空气清洁） T his lesson discusses the cleaning of particulate contaminants from both ventilation air and recirculated air for the conditioning of building interiors. Complete air cleaning may also require the removal of airborne particles,microorganisms,and gaseous contaminants,but this chapter only covers the removal of airborne particles and briefly discusses bioaerosols. 这节课讨论建筑内部来自通风设备空气和循环空气的微粒污染物的清洁问题。完整的空气清洁可能也要要求清理掉流动空气中的微粒，微生物，气体污染物，但是这章我们仅仅覆盖清理掉流动空气中的微粒，并且简要的讨论生物气溶胶。 The total suspended particulate concentration in the applications discussed in the chapter seldom exceeds 2mg/and is usually less than 0.2mg/ of air. This contrasts with flue gas or exhaust gas form processes, where dust concentration typically ranges form 200 to 40000mg/. 这总的悬浮微粒微生物在这个章节的应用讨论中很少超过2mg/并且通常少 于空气的 0.2mg/，这个对比与过程中的烟道气体或者排气，那里的尘埃污染物大体变化范围从200到40000/. With certain exception, the air cleaner addressed in this chapter are not used in exhaust gas streams, mainly because of the extreme dust concentration and temperature.However, the principles of air cleaning do apply to exhaust streams, and air cleaners discussed in the chapter are used extensively in supplying gases of low particulate concentration to industrial processes. 有一个特例，在这个章节的空气清洁的处理不能应用到排气流控制中，主要因为极端的尘埃污染物和温度。然而，这空气清洁的原则可以应用到废气流控制中，并且在这个章节中的空气清洁被广泛的应用在从低微粒污染物的供应气体到工业的进程。 Air cleaning applications (空气清洁的应用) Different fields of application require different degrees of air cleaning effectiveness. In industrial ventilation, removing only the larger dust particles form the airstream may be necessary for cleanliness of the structure, protection of mechanical equipment, and employee health.In other application, surface discoloration must be prevented.unfortunately, the smaller components of atmospheric dust are the worst offenders in smudging and discoloring building interiors. Electronic air cleaners or medium-to high-efficiency filters are required to remove smaller particles, es