(1) to meet the requirements of dust removal efficiency. Generally speaking, the structure of filter cloth should be selected according to the strength of filter bag. If the dust removal intensity is high, if compressed air pulse back blowing is used, the residual ash layer on the filter bag is blown off, and the dust removal effect string is maintained completely by the compactness of the filter cloth, it is generally required that the filter cloth is relatively rough and the dust-facing surface has fluff. The fluff on the surface of the filter bag can increase the surface area of the trapped particles; Provide support between holes to prevent accumulated ash clusters from penetrating into pores, thus forming loose layers; As a bonding structure, it is helpful to maintain the sticking ash layer and increase the initial effect string when cleaning the filter bag.

(2) To meet the requirements of dust removal, the resistance of filter cloth to keep economic operation is 800-1500pa. Besides reasonable selection of dust removal methods, it is also required that the filter cloth is easy to remove dust.

(3) To meet the air permeability requirements, the air permeability of fabric filter cloth is an important filtration performance, and the water absorption of filter cloth has a decisive influence on the air permeability. Natural fibers and organic synthetic fibers have the characteristic of absorbing moisture in dusty gas at normal temperature, so they adhere to and dissolve the dust in dusty gas, accumulate on the filter bag or undergo further chemical changes and gradually lose air permeability, thus reducing or even losing the filtering effect, so that the filter bag must be removed for cleaning or replacement.

The filter press is operated intermittently, including plate and frame filter press, chamber filter press and vertical filter press. The filter plate has the advantages of stable performance, convenient operation, safety and labor saving, precision casting of metal and plastic steel filter plates, high temperature resistance, high pressure resistance and durability. Because the filter press itself is of the same specification, the different filtration precision and speed required by different filtering objects are realized by using different filter cloths, also called filter bags. Each filter plate of the filter press is wrapped with filter cloths. According to the requirements of acid and alkali resistance, tensile strength, filtration precision and filtration speed of different filtering objects, the material and model of the filter cloths used should be determined first, and then according to the size and shape of the filter plates, the matching filter bags should be processed and sleeved on the filter bags