Air filter USES and characteristics of various kinds of classification
Air filter is mainly used for inlet air purification and remove the dust particles. In addition, some of the production process of exhaust contains small pollutants (such as radioactive material, oil mist, etc.) although this kind of purification belongs to exhaust purification, due to its high purification requirements, also need to adopt the air filter.
Inlet air purification processing is the feature of low dust concentration and fine dust particles in the air, the requirements of the purification efficiency is high. Depending on the purification efficiency, the classification and performance of the air filter are shown in table.
Note: (1) general filter USES atmospheric dust counting method, high efficiency filter using the method of DOP. Can also according to the specific use of air filter, characteristics and different structures, such as:
(1) at the beginning of air filter
Purpose: general ventilation and air treatment equipment in primary filter filter segments or fresh air system.
Features: can change the filter material, at the beginning of the paper box for one-time.
(2) the folding of the air filter
Use: filter ventilation system. Electronic, pharmaceutical, mechanical instrumentation, metallurgy, petroleum, chemical industry, light industry, food, etc in the field of air purification.
Features: high efficiency, large amount of dust, small footprint.
(3) the bag in the air filter
Purpose: central air-conditioning ventilation systems, or as a prerequisite for the efficient filter filter, it can reduce the burden of high efficiency air filters, prolong the service life and can also be used for general air purification industry.
Features: large amount of small resistance, dust capacity.
(4) active carbon filter
Get rid of the stink effectively, volatilize agent, bacteria, virus and various kinds of pollutants in the air, such as paint spray, smoke, electronic factory and common pollutant of museum, and the stench of food processing factory and hospital.
Features: highly developed porous structure, high adsorption capacity, fast absorption, stripping, cleaning effect is good. Use activated carbon filter must grade filter before having, otherwise, due to other pollutants and reduce the efficiency of active carbon in the air.
(5) nylon net air filter
Application: air quality is not high ventilation and air conditioning system, or the surrounding environment is bad, as a junior prefiltering dust in high places.
Features: small resistance, easy to clean, easy to maintain.
(6) and the high efficiency air filter
Application: all kinds of clean engineering and technology have special requirements of the central air conditioner and air supply system of end filter or clean room.
Features: high filtering efficiency, low resistance, large amount of dust.
(7) high efficiency air filter
Usage: clean air conditioning system, environment with high degree of cleanliness.
Features: high efficiency, low resistance.
Hepa filter (8) large air volume
Purpose: air conditioning box end high performance filter.
Features: high filtration efficiency, big air volume, large amount of dust.
(9) aluminum plate type air filter net
Purpose: air quality is not high ventilation and air conditioning system, or the surrounding environment is relatively poor, dust, grease the big place as the primary filter.
Characteristics: durable, easy to clean.
(1) high efficiency air filter air supply outlet
Usage: suitable for the laminar flow in the form of various level of cleanliness and a variety of condole carries on the structure of the clean room.
Features: reliable performance, simple installation, convenient disassembly and maintenance.
(11) with high efficiency air fan filter unit
Application: suitable for hospital sterile operating room and electronics, biology, medicine, food and other manufacturing areas.
Features: hang on the floor, clean effect can reach ten thousand or hundreds or thousands, save floor space, suitable for local purification, especially the environment as the food industry often have to wash the floor.
Air shower (12)
USES and features: air shower, operators enter the clean room use personal purification plant. Using high-speed clean air blown it get rid of the dirt into the interior personnel. The nozzle can be adjusted, in order to effectively remove the dust in the people, and prevent the pollution into the clean area. It also can be applied to large cargo blowing rain.
(13) transfer window
USES and features: clean area to reduce the number of open the door and set a device for passing objects, it makes the cleanroom contamination to a minimum. Mainly used in different levels clean areas, and between the clean areas and clean areas between the transmission of small items.
(14) leaching transfer window
Application: suitable for objects before entering the clean area, object surface contamination can be removed using the clean air blow pipe, or clean areas and clean areas between the transmission of high cleanliness requirements.
Features: the nozzle can be adjusted to aim directly at objects for blowing rain, pollution, effectively remove the object and prevent the pollution into the clean area.
Super clean workbench (15)
USES and features: super clean bench is a partial purification equipment. It can effectively eliminate the working area of suspended particles in the air and the harmful effects of dust on the products, widely used in medical, pharmaceutical, chemical experiment, electron, precision instruments, food and cosmetic fields.
According to the air filter material of different can be divided into the following several kinds:
(1) the foam filter
Foam filter using polyethylene or polyester foam layer. Foam to advance for chemical treatment, the internal porosity membrane penetration, make it has a series of interconnected pores. Due to inertia, dusty air flow through the diffusion effect such as dust adhesion on hole wall, make the air purification. The internal structure of foam is similar to vegetable sponge, aperture is about 200 microns to 300 microns.
Foam with acetone, butanone, ethyl acetate and carbon tetrachloride, ether and other organic solvents exposure, otherwise easy to damage of expansion. Can be resistant to weak acid weak base. Gasoline, watch oil, lubricating oil and so on has no effect on it.
(2) fiber filled filter
Fiber filled filter consists of a framework and the filter material. According to the requirements of the purification efficiency and resistance, to adopt different thickness of various kinds of fiber as a filler, such as glass fiber (about 10 microns in diameter), synthetic fiber (polystyrene), etc. Packing density has a great influence on the efficiency and resistance. The thickness of the filter and packing density should be determined according to the specific requirements.
(3) the fiber felt filter
This filter is to use a variety of fiber such as polyester cang, whalen, etc.) of non-woven filter material (felt). Usually make bag or roll bending type two kinds.
Bag type fiber felt filter with the non-woven filter material folding or v-type filter bag, to expand the filter area, reduce the filtration velocity. Its purification efficiency is higher, the commonly used in the filter, this filter type a lot more, each monomer filter air volume is about 200 m3 / h, the filtering wind speed of about 20 cm/s, the weight of artificial dust efficiency is 80%.
Automatic volume flexible filter can use foam or non-woven fabric as filter material, about 20 m each roll of filter material. Filter by upper and lower box, box, keep-off bar, drive mechanism and filter material composition. Filter material after dust, can automatically scroll updates, until the whole roll of filter material, after all the dust off replacement. Each roll of filter material usually can use 8 months to 1 year.
(4) the paper filter
Paper filter is a kind of high efficiency and high efficiency filter, used as a filter for filter paper are: (1) the plant cellulose filter paper (used for the high efficiency filter); (2) blue asbestos fiber by d filter paper (used for high efficiency filter); (3) the superfine glass fiber filter paper (can be used for the high and high efficiency filter).
Due to the resistance of the filter paper is higher, its filtering wind speed is low, to increase the filter area, can clean the filter paper into folding, with the state of the corrugated points between the diaphragm. A partition available qualified kraft paper after hot rolling is made, also can use plastic or aluminum plate. Outside the box available board, plastic board, aluminum, steel and other materials.
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