Reasons and treatment of “mushy” filter bags in industrial dust collectors

“Mushy” bag, “Paste bag”, it is a phenomenon and a problem in the use of dust removal bags, and it is one of the reasons why the dust removal bags lose their effectiveness. There is no uniform definition in the industry. It is generally believed that “paste bag” refers to the fact that during the long-term operation or shutdown of the dust removal bag, in the working conditions with high humidity or oily substances in contact with the filter material, the dust condenses on the filter surface of the dust removal bag or inside the filter material, Adhesion or crusting and cannot be effectively removed by the online ash cleaning system, resulting in the phenomenon that the running resistance is greatly increased.

The dust covers the surface of the filter bag and cannot be cleaned, the air permeability of the filter material drops sharply, and the running resistance becomes very high, which increases the load of the induced draft fan and causes the energy consumption to rise. The dust collector cannot handle the pressure of the fan and deforms. At the same time, the high pressure drop of the dust filter bag makes the online dust cleaning system frequently clean, which not only needs to consume a lot of compressed air, but also causes a serious loss of the mechanical strength of the filter material and greatly shortens the service life. Therefore, if the dust bag is always operated in the state of pasting bag, the user will have to pay a higher operating cost for the operation of the system. If the problem of pasting bags is not solved in a timely and effective manner, the bags will have to be replaced in batches.

If they are directly connected, once they meet the electrolyte formed by water, carbon dioxide and other impurities, a chemical battery will be formed. This is because aluminum is easy to lose electrons to become a negative electrode, and copper is difficult to lose electrons to become a positive electrode. An electromotive force of 1.69V is formed between, and a small current passes through, which corrodes the aluminum wire, which is the so-called galvanic corrosion. This will cause poor contact between copper and aluminum and increase the contact resistance. When a current passes through, the temperature of the joint will increase, which will further accelerate the corrosion of the joint, increase the contact resistance, and cause a vicious circle until it burns out.