How do we distinguish between high efficiency filter, how to filter, how to see its filter index? In general, an efficient filter is to look at its filter indicators, mainly from three aspects: the filter precision, is to allow the maximum diameter of the impurity particles. Filter is the key to affect the accuracy of the filter, according to the needs of the following components to select different filters, so that it can achieve the corresponding filtering accuracy. Flow characteristics are the relationship between the air flow rate and the pressure drop across the filter at a certain inlet pressure. In practical use, it is better to use the pressure loss in the range of less than 0.03MPa. In the high efficiency filter, the main effect of the flow characteristics is the main body and the filter element. Water efficiency, water is water and air inlet means separated in the. General requirements for high efficiency filter water efficiency is not less than 80%. Influence of water diversion efficiency is the main guide plate. High efficiency filter is divided into three kinds of self cleaning:
First, automatic self-cleaning: when the pressure transmitter detects negative net gas cavity and the suction cavity to set back blowing pressure, display control instrument first alarm alarm and switch quantity output signal to the PLC, the PLC receives the switch signal according to the preset program of each filter blowback a group of 5 filters. Under normal circumstances, the high efficiency filter under the action of anti blowing, the net gas chamber and the suction chamber negative pressure drop, when the negative pressure down to the set of negative pressure, the reverse blow. When the high efficiency filter in long time running, has little effect on the filter blowback pressure loss decreases the negative pressure, the clean gas chamber and the suction chamber will continue to rise, when the pressure rises to the set pressure alarm, display controller second alarm alarm and switch quantity output signal to the PLC. The PLC receives overpressure alarm lamp power supply switch signal after the door switch on the control board, overpressure alarm lights indicating equipment management personnel should timely replacement of filter.
Second, the timing of the clean way: when switching to this way, PLC according to the preset timing counter blowing program for each set of filter in turn, the interval time and the number of anti blow times can be set in advance.
Horizontal flow clean bench
Third, manual cleaning methods: to switch to this mode of operation, the PLC according to the preset timing counter blowing program for each set of filter in turn, only to turn off this mode, the counter blow to stop. Efficient filter use, and the use of axial flow fan of the original high efficiency filter for the bag filter,
There are the following shortcomings in practical application: (1) because of the limitation of the structure, the actual overall filtration area is small; (2) coarse filter material, the filtration efficiency can reach the effect of filtering effect; (3) due to low filtration efficiency, dust easily enters the compressor impeller and Blade Runner, and other internal parts, causing the compressor the internal parts wear and corrosion, scaling, damage to equipment and production; (4) filter replacement is not convenient; (5) the initial filter pressure loss, pressure loss increased rapidly during operation.
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