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                    Factors affecting air filters
                    News category: News information    Addtime: 2017/9/12 11:03:05

                    1. efficiency air filter, filter efficiency is the main factors affecting the temperature of the particulate filter air filter fiber diameter, thickness and structure of the filter, air velocity, air and dust content, summed up the nature of the filter efficiency depends on the filter performance, by filtering air flow and the air velocity. The filtration efficiency of different types of air filters under rated air volume and 2O% rated air volume, the rated air volume of the test system is 3400 M. H, the detection method is sodium flame method. Frame structure of these models using the same filter, different filter made from the test results can be seen; in the range of allowable error, influence on filtration efficiency of air filter structure is very small, mainly related to the performance of the filter; filtration efficiency airflow velocity changes will affect the filter, in the same air flow filter the efficiency of different types of filters are slightly different, this is because the filter area caused by different filter speed. At the rated air volume of 2O, the airflow filtration rate is reduced, and the filtration efficiency is not reduced, which proves that the filter has no leakage. For the same type of filter, when the air flow rate, filter area and filter material performance are the same, the filter efficiency is not changed greatly. From the 2O YM1 model filter detected in Fig. L, we can see that when the rated air volume is equal to 2O 9 and 6 rated air volume, the efficiency fluctuation of the air filter is similar. YM2, YM3 and YM4 model filters also have the same conclusion.

                    2. air filter resistance, resistance analysis there are 2 main theories: one is channel theory, the system can be simulated by assuming that the porous capillary structure, and the air flow through the circular capillary with Bo leaf (Poiseuille), Carman, Kozeny law, Clarefiburg on the use of this theory; the other is resistance the theory assumes that certain geometric models of porous bodies as realistic as possible at the same time is very simple, can be used to calculate the velocity field, and know the whole filter resistance, Kuwabara and other scholars adopted the theory of L5. The research shows that the resistance of air filter is mainly related to air velocity, filter area, filter structure, gas viscosity, average free range of gas, average radius of fiber and filling density. These effects can be summarized in the round, filter resistance resistance and filter structure as resistance to 2 parts, calculationformula obtained corresponding resistance. A large number of experimental data measured and calculated from the theory that the experimental values and the theoretical values there are some errors, this is mainly due to the model and filter theory established by the actual flow field is not exactly at the same time due to do in order to simplify the calculation of the assumption is a kind of ideal condition. On the same type of filter, the same rated air flow, structure resistance is equal, the total resistance s not the same size, mainly due to the different material resistance total resistance is different; different structure of air filter in the same air flow resistance is not equal, the structure and the filter resistance except the inherent structure but also by the media performance influence and filter performance will flow through the channel of the filter effect and affect the structure of resistance.


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