Application of self-cleaning air filter in special weather conditions

Application of self-cleaning air filter in special weather conditions

In continuous rain, fog or frequent continuous sandstorm weather conditions, the self-cleaning air filter will often appear resistance greater than 1200Pa, or even seriously exceed the standard. The occurrence of this situation for a long time will endanger the safety of the equipment and make the operation of the air compressor deviate from the normal working condition, reduce the suction volume, increase the operation cost, and seriously cause the air compressor surge. The reasons for excessive resistance under special weather conditions are analyzed below.

Self-cleaning air filter filter material is generally most of the selection of wood pulp fiber paper filter paper, this filter paper is made of multi-layer tissue paper composite, the average micropores of each layer of paper is about 20-70 μm, micropores crisscrossed, with air permeability. The resistance value of air passing through filter paper is small at low filtration speed (initial resistance is generally below 100Pa), and the effect of this filter paper is better in dry environment. However, in the continuous rainy and foggy weather, the relative humidity of the air is high (> 96%), and the filter paper expands after the fiber is damp, which makes part of the micropores narrow or blocked. If the filter paper has been used for a period of time, there is dust on the outer surface of the filter paper and the core layer of the paper. After being damp, it will also expand and block the microholes, making the permeability of the filter paper greatly decreased or even paste the cylinder. The effect of self-cleaning is also greatly reduced at lower backblowing pressure.

In order to solve the problem of excessive resistance in this weather, the following countermeasures can be adopted: in the south of China along the river, coastal areas or foggy areas (such as Chongqing, etc.) the relative humidity is larger (> 80%), in the selection of the filter, the selection of the filter cylinder to adapt to the local climate conditions, the need to increase the actual amount of gas processing. Filter drum to choose composite fiber filter drum (20% polyester +80% wood pulp fiber), filter paper to choose high tensile strength, high stiffness waterproof filter paper. This can well solve the problem of excessive resistance of self-cleaning air filter in special weather conditions.