Many filtration units have been installed in various industrial plants for decades. Some of these units are obsolete and uneconomical. The operating costs of such equipment can be quite high, which can be reflected in a higher rate of wear of the filter materials, higher consumption of compressed air, etc. To maintain optimal operating costs of industrial textile filters, it is necessary to regenerate the clogged filter fabric. This regeneration can be started according to the pressure drop or after set time intervals. In most cases, however, regeneration triggering based on filter pressure drop is used. The control program is set so that the pressure drop is around the optimum value. The actual regeneration can be ensured in two basic ways: by backwashing or pulse regeneration. An important operating parameter of the filter is its operating pressure loss, which forms the most significant share of the total pressure loss of the entire flue gas tract, for which the smoke fans are dimensioned. This means that the pressure drop of the filter essentially directly affects the operating costs not only of the separation device, but also of the entire unit. The operating pressure drop of the filter is very closely related to the efficiency of regeneration, ie the ability to remove the filter cake trapped on the surface of the filter hoses during filtration. At present, industrial filters with pulse regeneration are used to a greater extent. However, the disadvantage of pulse regeneration, on the other hand, is the need for a relatively expensive compressed air medium.
Several factors have a significant effect on the resulting pulse regeneration efficiency. The basic requirement is to ensure even regeneration of all filter surfaces. Filters with pulse blow-through are usually designed as hose, whose regeneration takes place in rows. For each row, the compressed air is distributed by a common diaphragm valve and a switchboard
trumpet. The same regeneration efficiency must be ensured in all these hoses. Also, approximately even regeneration must be ensured along each filter hose. This is a question of the design of the regeneration device, which consists of an outlet nozzle in the distribution pipe and a mixing (Venturi) nozzle in the mouth of the hose. Since the consumption of compressed air is also a significant variable influencing the operating costs of the filter, it is necessary to make optimal use of the energy of compressed air for efficient pulse regeneration. This is again a question of the structural arrangement of the regeneration device, but also of the distribution pipe itself.