空氣淨化器是如何淨化空氣的?

什么是空氣淨化器

空氣淨化器也叫空氣清新機。迷你空氣清新機定義為能去除空氣中一種或多種汙染物，如顆粒物、氣態汙染物、微生物等的家用及類似電器。空氣淨化器可以吸附、分解或轉化空氣中的汙染物。

日常生活中的汙染物包括: PM10、 PM2.5及其他微粒或溶膠; 甲醛、甲苯、二甲苯、二氧化硫、氨、臭氧和揮發性氣體汙染物的典型氣態有機、無機化學汙染物; 以及細菌和其他過敏原等微生物。

針對以上不同的汙染物，空氣淨化機的主要功能可以分為去除顆粒物、甲醛、細菌和一些特定的氣態汙染物。顆粒物淨化技術有兩種:各種級別的顆粒物過濾器和靜電吸附，其中高級別的過濾器通常稱為HEPA。氣態汙染物的淨化主要通過活性炭吸附、複合反應、靜電高壓分解或化學催化來實現。微生物一般通過篩網攔截或靜電殺滅來去除。

空氣淨化器的能力指標

對淨化器淨化技術能力的評價，表現為“提供一個潔淨空氣的能力”，即單位工作時間提供“潔淨空氣”的多少。這個重要指標體系實際上我們就是“潔淨空氣量”，簡稱 CADR。CADR值越大，說明空氣淨化器的淨化處理能力越來越強，即可在相對短的時間內使作用的空間進行迅速得到淨化，換句話說，就是可在相對短的時間內通過甲醛清除提供需要大量的“潔淨空氣”。

淨化空氣的方式

實現汙染物淨化的專用空氣淨化器如下:

機械過濾:一般有四種方式捕獲顆粒:直接攔截、慣性碰撞、布朗擴散機制和屏蔽效應。這些方式對細顆粒物的收集效果都很好，但是風阻較大。為了獲得較高的淨化效率，濾網的阻力較大，濾網需要緊湊，導致壽命降低，需要定期更換。

高壓靜電除塵: 是一種既能保證風力又能吸附細微顆粒的方法。利用高壓靜電場電離氣體，使粉塵顆粒帶電並吸附在電極上的收塵方法，雖然風阻小，但收集較大顆粒和纖維的效果差，容易產生放電，清洗費時，容易產生臭氧，造成二次汙染。

靜電駐極體過濾網:機械過濾只能有效去除10μm以上的顆粒物，而當粒徑下降到5μm、2μm甚至亞微米的范圍時，高效的機械過濾系統會變得更加昂貴，風阻會顯著增加。采用靜電駐極體空氣過濾材料過濾，可以低能耗實現高捕集效率，同時具有靜電除塵、風阻小的優點，但不需要外加數萬伏的電壓，因此不會產生臭氧。

靜電除塵：能過濾比細胞還小的灰塵、煙霧和細菌，防止肺病、肺癌、肝癌等疾病。空氣裏對人體最有害的是粒徑一般小於2.5μm的灰塵，因其能穿透組織細胞，進入中國血液。普通淨化器可以采用濾紙來過濾以及空氣中的灰塵，極易發生堵塞濾孔，不僅自己沒有達到滅菌處理效果，而且學生容易發展造成影響二次環境汙染。

靜電殺菌: 利用約6000V 高壓靜電場，可瞬間完全殺滅附著在粉塵上的細菌、病毒，預防感冒、傳染病等疾病。殺菌機理是破壞細菌衣殼蛋白的四條多肽鏈，破壞 RNA (RNA)。

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