Why is the back-pulse design used for bag dust collectors?
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Why is the back-blowing of the filters in bag dust collectors designed to be controlled by pulse solenoid valves? A pulse controller is also needed. Why not design it as a single tube through which air is supplied, with a manual valve that can be opened to keep blowing?
The principle of pulse bag filter dust removal is that air enters the bag, while the filtered gas is on the outside of the bag. After use for a period of time, a filter cake forms on the inner wall of the filter bag. When this layer of filter cake reaches a certain thickness, an opposite high-pressure airflow (higher than the pressure before filtering) is required for backwashing. As the material is blown off the filter bag, it falls due to its own gravity into the collection hopper below, where it can be removed at regular intervals. Designed as pulsed, it features artificially set timed back-purging based on the time at which the thickness limit of the filter cake is reached. Note: Although the types of filter bags vary and the filtration direction may differ, the principle remains the same.
If the air is kept blowing over the bag, there will be no dust left, and the bag filter will then lose its function
This pulse purge is different from a dedicated pulse valve, right?