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Principle of air purification

1 air filter structure

Air purification process can be divided into pre filter, filter, high efficiency filter and filtration efficiency of four stages, each stage of the equipment required are the primary filter, medium efficiency filter, high efficiency filter, high efficiency filter.

(1) primary effect filter

Primary effect filter is the first stage of filtration of air purification treatment, mainly filtering large particles of dust and a variety of foreign bodies, the interception diameter is 10. The structure of the main form of two types of plate and bag, due to the large gap between the primary filter, small resistance, can be used with a high wind speed (0.4 ~ 1.2) filter.
For easy cleaning, early filter filters commonly used in coarse, pore foam plastic or non-woven fabrics, according to the dust concentration of imported air filter, replace the cleaning regularly to keep the air flow into the filter with low resistance and high.

(2) medium efficiency filter

The middle efficiency filter is mainly used for filtering particles in the range of 10 to 1, and the filtering medium is generally used as a cleaning medium, a fine pore size of the foam plastic, glass fiber, synthetic fiber or non-woven fabric. Air filtration rate is 0.2 ~ 0.4.
The structure of the filter is mainly in the form of a wedge plate type and bag type two. The middle efficiency filter is designed to extend the positive pressure section of the high efficiency filter to prolong the service life of the high efficiency filter.

(3) sub high efficiency filter

Sub high efficiency filter is mainly used for removing the dust particle diameter of less than 5, widely used in clean level is equal to or less than 100 thousand, and the environmental dust removal and sterilization requirements of high places, is the terminal filter class 300 thousand clean workshop. The filter media are efficient glass fiber filter, a vinyl chloride fiber filter cloth, polypropylene fiber filter cloth. The structure of the form is divided, tube type, bag type.

(4) high efficiency filter

Efficient filter is used to filter out the diameter of less than 1 of the particles, can filter out the dust particles of 99.97%0.3, is a clean plant and local purification equipment terminal filter.
HEPA filter mainly adopts ultra-fine glass fiber filter paper or asbestos material, is belongs to the non renewable, so it must be installed in effect or sub high efficiency filter protection in front of HEPA filter.

HEPA filter generally adopts a folding assembly, in order to ensure the filtration efficiency and provide enough air, efficient filter with low wind speed, wind speed at 0.01 ~ 0.03, and the larger filter area.

2 air purification process

The air cleaning system is composed of air cleaning system, air disinfection system, air distribution system and so on. The main equipment of air purification engineering is composed of the draught fan, the pre filter, the main filter (electrostatic precipitator), the ozone sterilization layer, the active carbon filter, the negative ion generator and so on. In addition, in order to ensure the air humidity and temperature, can also be added for heating or cooling and humidity device etc..

(1) in general, the draught fan adopts a multistage centrifugal fan, which can ensure the air quantity and the pressure, and the noise is small. The use of electrostatic dust can be selected through the use of cross flow fan can also meet the requirements.

(2) the pre filter is the primary effect filter and the filter, the purpose is to remove the fresh air in more than 5 of the particles, the protection of the high performance of the filter equipment.

(3) the main filter removed less than 1 of the particles. Choose one of the high efficiency filters and electrostatic precipitator. The proportion of electrostatic precipitator is 90%.

(4) the ozone sterilization layer uses the ozone generator to produce ozone to carry out disinfection and sterilization to the air.

(5) activated carbon filter through the main filter through the active carbon filter, can remove the ozone and acid gas, can purify the dust in the gas, aerosol and steam.

(6) anion generator can make particles floating in the air of the negatively charged particles to make these trapped or precipitation, thus making workshop air cleaner. Therefore, the vast majority of air cleaning systems are equipped with a negative ion generator, in order to improve the quality of air.