Dust concentration at the inlet of dust collector

The dust concentration at the inlet of the dust collector is often expressed by the standard volume dust mass. For the dust concentration at the inlet, the following points should be considered in advance when designing the dust collector

(1) The resistance of dust collectors and other equipment and the cleaning cycle. The dust concentration at the inlet increases, and the equipment resistance increases under the same filter area. In order to maintain a certain equipment resistance, the cleaning cycle is shortened accordingly;

(2) Abrasion of the filter material inside the dust collector and the box body. In the high concentration of dust with strong abrasion, the amount of abrasion is proportional to the concentration of dust. At the entrance of the dust collector, there should be diversion and wear-resistant treatment technologies, such as sintered dust, alumina powder, silica sand powder, etc.;

(3) Know the air pressure speed of dust collector and filter in advance. In the case of high dust concentration at the inlet, a lower filtration wind speed should be designed, but if a structure with a primary settlement function is designed, the pre-dust collector can also be eliminated;

(4) Dust collector cleaning device. The ash discharge capacity is based on the ability to discharge all the collected dust. The discharged dust volume is equal to the product of the difference between the inlet and outlet dust concentration and the processing air volume. The capacity of the multi-stage ash discharge device should be designed to be greater than the previous one. Ash capacity shall prevail.

Exhausted gas dust concentration

The dust concentration of the removed gas must be lower than the specified value of environmental protection laws and national health standards. The dust concentration at the outlet of the bag filter varies according to the structure of the filter, the type of filter material, and the nature of the dust, generally between 1-50mg/m3. In the case of harmful substances such as lead and cadmium, the outlet concentration is required to be particularly low, and different dust collector structures and filter materials should be selected according to different uses and process characteristics during design.

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