Spray pipe in dust removal accessories; Distance from bag opening:

The distance between the dust removal accessory spray pipe and the bag mouth is an important dimension for designing a pulse bag filter, which is related to many factors such as the structure of the spray pipe, the size of the filter bag, and the nature of the dust. Therefore, it should be taken seriously in the design.

(1) Determine the length of the spray pipe based on the number of dust removal filter bags.

(2) The wall thickness of the spray pipe should be determined based on its length and material (hardness), and it should not bend or deform due to its own weight.

(3) Install supersonic drainage nozzles on the ash cleaning system spray pipe to prevent the occurrence of off center airflow.

(4) If a drainage nozzle is not installed and only a short pipe is welded under the blowing hole, it cannot overcome the off center phenomenon of the blowing airflow, and resistance will be generated due to the friction between the supersonic blowing airflow and the pipeline.

(5) In order to ensure that the difference between the pulse airflow entering one filter bag and the subsequent dust removal bag is within 10%, the aperture of the same spray pipe may be different Generally, the diameter of the nozzle located far away from the airbag is smaller than that of the nozzle located near the intake airbag The diameter of the injection hole will be the main parameter for determining the cleaning pressure and gas flow rate of the pulse injection system.

(6) The expansion angle of supersonic pulse airflow is generally around 20 degrees depending on factors such as airbag pressure, pulse valve resistance, nozzle size, and number of nozzle holes Based on the diameter of the filter bag and the designer's experience and experimental values, determine the optimal distance between the spray pipe and the flower board. The spray airflow can cover the entire length of the dust removal filter bag.