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Performance indicators for air filters

air filterof performance indicators

 

 

 

Filtration Accuracy
Refers to the maximum diameter of the impurity particles allowed to pass. The key to affect the filtration accuracy is the filter cartridge, according to the needs of the rear components to choose different filter cartridges, so that it achieves the corresponding filtration accuracy.
Flow characteristics
It refers to the relationship curve between the air flow of the filter and the pressure drop at both ends of the filter under certain inlet pressure, and it is best to choose within a range of less than 0.03MPa of pressure loss when actually used. In air filters, it is mainly the ontology and the filter cartridge that affect the flow characteristics.
Water separation efficiency
Refers to the ratio of the separated moisture to the moisture contained in the air at the inlet. It is generally required that the water separation efficiency of the air filter is not less than 80%. The main impact of water separation efficiency is the diversion plate.
Air filters have different filtration efficiencies for different concentration metering.
(1) Weight efficiency dust concentration is expressed in mass concentration (g/m³)
(2) Counting efficiency The dust concentration is represented by the counting concentration (pc/l)
(3) Sodium flame efficiency to sodium chloride solid particles as a source of dust. The concentration of sodium chloride particles was measured by photoelectric flame photometer. Sodium flame efficiency is comparable to counting efficiency.
Filter resistance
The resistance of the new filter under the rated air volume is called initial resistance, and under the rated air volume, the amount of dust in the filter is large enough to need to clean or replace the filter material when the resistance is called the final resistance.
Dust capacity of the filter
At the rated air volume, when the resistance of the filter reaches the final resistance, the total mass of the dust particles it accommodates is called the dust capacity of the filter.
Selection principles
According to the specific situation reasonable selection of suitable air filter, its selection principle is as follows:
1. According to the clean purification standard of indoor requirements, determine the efficiency of the last stage air filter, reasonably choose the combination series of air filter and the efficiency at all levels. If the indoor requirements of general purification, you can use the first effect filter, such as indoor requirements of medium purification, should be the use of initial efficiency and intermediate two level filter, such as indoor requirements of ultra-clean purification, should be the first effect, medium efficiency and efficient three-stage purification filtration, and should reasonably and properly match the efficiency of the filter at all levels The front level filter does not protect against the latter level filter.
2. Correct determination of dust content and dust particle characteristics of outdoor air. Because the filter is to purify the outdoor air filter into the room, so the dust content of outdoor air is a very important data. Especially in the multi-stage purification filtration treatment, the selection of pre-filter when the use of the environment, spare parts costs, operating energy consumption, maintenance and supply factors, such as a comprehensive consideration of the decision.
3. Correctly determine the filter characteristics. Filters are mainly characterized by filtration efficiency, resistance, penetration rate, dust capacity, filtration wind speed and treatment of air volume. In the case of permissible conditions, should be as far as possible to choose high efficiency, low resistance, large amount of dust, moderate filtration wind speed, large processing volume, easy to manufacture and install, low price filter. This is a comprehensive consideration of the need for an economic analysis of one-off investments and two-time investment and energy efficiency ratios in the selection of air filters.
4. Analysis of the properties of dust-containing gases. The properties of dust-containing gases associated with the selection of air filters are mainly the amount of temperature, humidity, acid-alkali and organic solvents. Because some filters are allowed to be used at high temperatures, some filters can only work at room temperature and constant humidity, and the amount of acid-alkali and organic solvents containing dust gas has an impact on the performance efficiency of the air filter.