Filter selection principle and rated air volume

The resistance of the new filter under the rated air volume is called the initial resistance; under the rated air volume, the resistance of the filter when the dust holding capacity is large enough to clean or replace the filter material is called the final resistance. Under the rated air volume, when the resistance of the filter reaches the final resistance, the total mass of dust particles contained in it is called the dust holding capacity of the filter. The selection principle of air filter Reasonably select the appropriate air filter according to the specific situation. The selection principle is as follows: 1. According to the clean purification standard required by the room, determine the efficiency of the final air filter, and choose the air filter reasonably. Combining the number of stages and the efficiency of each stage. If the indoor requires general purification, the primary filter can be used. If the indoor requires medium purification, the primary and medium-efficiency filters should be used. If the indoor requires ultra-clean purification, the primary, medium and high-efficiency three-stage purification should be used. Filtering, and should reasonably and properly match the efficiency of the filters at all levels, if the efficiency of the adjacent two-stage filter is too different, the former filter can not protect the latter filter. 2. Correctly measure the dust content and particle characteristics of the outdoor air. Because the filter is to filter and purify the outdoor air and send it indoors, the dust content of the outdoor air is a very important data. Especially in multi-stage purification and filtration treatment, the selection of pre-filters should be determined after comprehensive consideration of factors such as the use environment, spare parts costs, operating energy consumption, maintenance and supply. 3. Correctly determine the filter characteristics. The characteristics of the filter are mainly filtration efficiency, resistance, penetration rate, dust holding capacity, filtration wind speed and processing air volume. When conditions permit, filters with high efficiency, low resistance, large dust holding capacity, moderate filtering wind speed, large processing air volume, convenient manufacture and installation, and low price should be selected as far as possible. This is the economic analysis need to comprehensively consider one-time investment, secondary investment and energy efficiency ratio when choosing an air filter. 4. Analyze the properties of dusty gas. The properties of the dust-containing gas related to the selection of the air filter are mainly temperature, humidity, the amount of acid and alkali and organic solvents. Because some filters are allowed to be used at high temperature, while some filters can only work at normal temperature and humidity, and the amount of acid, alkali and organic solvents in the dust-laden gas has an impact on the performance and efficiency of the air filter.