Excessive dust emission
The basic cause of excessive dust emissions
(1) The initial layer of the filter bag surface is not enough;
(2) damage to the filter bag;
(3) poor filter bag assembly;
The description is as follows:
Insufficient initial layer of filter bag surface
In the operation of the precipitator, if the discharge exceeds the standard and the operating pressure of the precipitator is lower than designed, it is most likely that the initial powder layer on the surface of the filter bag is insufficient, which may be due to the high filter speed of the filter bag and the The cleaning cycle is too short, the pressure of the compressed air is too high, and the load of the dust is reduced.
Studies have shown that: excessive filtration speed, dust discharge rate will increase, excessive filtration speed, will make the initial dust layer broken, and dust impact filter bag and cause excessive wear, if the number of times to filter bags is too high It is very easy to loosen the fabric of the filter bag, which will cause the filter to discharge excessively.
When setting the period of pulse cleaning of the dust remover, it is possible to ensure that the dust remover works under a stable pressure, the longest time of the set pulse cleaning cycle is good, and the pulse cleaning time can guarantee that the initial dust does not fall off, and the set time The shortest cleaning time is good. If the initial dust layer is insufficient, the extended cleaning cycle can be used to compensate. If the pressure difference control is used, the stability of the dust collector inlet and outlet pressure settings can be improved.
If the dust collector exceeds the standard discharge only after cleaning the filter bag, it is only necessary to check if the pressure of the pulsed compressed air is too great.
The reduction of dust load may come from a decrease in productivity, or due to the overhaul and adjustment of the dust collector control system. The solution is to use a light load to slowly start the lift or use a pre-dust method.