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Air dust filter

Time: 2022-08-29

Air dust filter

The term "clean air" is often said, which can be understood from two related aspects. One refers to air purification, which means the "behavior" of clean air; the other refers to the clean "state" of clean air.

The purpose of air purification is to clean the polluted air to the state required for production and life. Or achieve some kind of cleanliness.

The so-called cleanliness refers to the cleanliness of the clean object - the air. Cleanliness is usually expressed by the size, quantity or weight of pollutants contained in a certain volume or weight of air. For example, in each cubic meter of air, there are X pieces of suspended particles greater than or equal to 0.5um, that is, the particles with a cleanliness of 0.5um are X pieces/m². Another example: the mass of dust per cubic meter of air is Ymg, and its cleanliness is expressed in mg/m².

Since the purpose and object of air purification are different, the content, methods and measurement standards of air purification are also different. From the perspective of the objects of air purification, some are to solve the problem of air pollution, and some are aimed at clean rooms. The purification of air pollution mainly involves the treatment of various gaseous wastes, which is aimed at high-concentration polluted air. And all kinds of clean rooms are faced with the purification problem of indoor air supply, which is aimed at ultra-low pollution concentration air. The so-called ultra-low pollution concentration air is the air that is considered to be relatively clean in daily life. Then for electronics, aerospace, high-precision machinery manufacturing, some medical departments and pharmaceuticals and other processes or rooms that have strict production environment requirements, this relatively clean air still does not meet the requirements and needs further purification.

In terms of indoor air purification, it can be divided into two categories:

One is air purification centered on human health. This is the so-called indoor air quality problem (IAQ-lndoor air quality) that the air-conditioning industry has paid great attention to in recent years. Due to the wide use of chemically synthesized building materials, adhesives, and various electrical appliances for office or living, various organic volatiles emitted into the room are increasing, and the air caused by bacteria, dust and smoking carried by people and released into the room Pollution has been shown to cause a variety of uncomfortable symptoms for indoor personnel and the spread of infectious diseases in relatively closed air-conditioned buildings. The air purification of these air-conditioned rooms is based on the requirements of human physiological characteristics for air cleanliness.

The other type is air purification for the purpose of industrial production, including pharmaceutical production, and its cleanliness is mainly to meet the requirements of product and article quality management. As mentioned in this chapter, because the production environment does not meet the required cleanliness during the production of medicines, the medicines may be contaminated by microorganisms or impurities, resulting in unqualified products.

In order to ensure that the production environment meets the cleanliness required by the process, various relevant comprehensive measures, including air conditioning and air supply systems, building decoration and maintenance management, can be taken to ensure that air purification can play a role.

According to different products, articles and process steps, the requirements for cleanliness are also different. Some processes, such as the lithography process of integrated circuits, and the assembly process of precision instruments such as navigation gyroscopes, are very sensitive to dust particles. There is a certain amount of sub-micron dust in the air of the production environment, which may cause an increase in defective products. For some processes, such as outsourcing workshops in the pharmaceutical industry, the requirements for cleanliness are similar to those of ordinary living environments. In a human environment, if the cleanliness standard required by the product is lower than the human requirement, the human requirement shall prevail. For processes that require high cleanliness, air clean rooms (CR-Cleanroom) and biological clean rooms (BCR-Biological Cleanroom) are used according to their needs. Various clean rooms rely on corresponding air purification measures, an important part of which is to supply sufficient and purified clean air to make the room reach the specified air cleanliness.

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