“Air purification” can be understood from two related aspects: one is air purification, which represents the “behavior” of air purification; The second is the clean “state” of clean air.

The purpose of air cleaning is to purify the polluted air to the state required by production and life, or to achieve a certain degree of cleanliness.

Air cleanliness refers to the cleanliness of the clean object – air. Cleanliness is usually expressed by the particle size, quantity or quality of pollutants contained in a certain volume or quality of air. For example, each square meter of air contains X suspended particulates greater than or equal to 0.5, that is, the cleanliness is ㄒ 0.5, and the particles are Xpc/. For example, the mass of dust particles in each cubic meter of air is Ymg, where the cleanliness is expressed in Ymg/.

Air purification is to use some means, methods and equipment to turn the polluted air into clean air. Due to the different purposes and objects of air purification, the contents, methods and measurement standards of air purification are also different. From the perspective of the objects of air purification, some need to solve the problem of air pollution, while others focus on clean rooms. The purification of air pollution mainly refers to the treatment of various gases and gas wastes, which is aimed at high concentration pollution. However, various clean rooms are faced with the purification problem of indoor air supply, which takes ultra-low pollution concentration as the air object. The so-called air with ultra-low pollution concentration is the air that is considered cleaner in daily life

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