1, dust bag Specifications Specifications and gas into the bag filter bag inlet velocity. When the dusty gas to enter each bag, when the population V1 speed is too fast, on the one hand will speed up the cleaning of the secondary dust flying, on the other hand because of the dust bag makes friction wear sharp increase, it is generally not V1 too. 2, the efficiency of dust removal equipment Efficiency dust removal equipment bag with nature, the filtration rate, gas and dust concentration continuous running time and other factors, and these factors are interrelated and interacting, therefore, should select the design parameters of a comprehensive dust removal equipment analysis and comprehensive consideration. Of course, dust removal equipment supporting the fan pressure and air flow dust accessories and other parameters will directly affect the effect of dust, it should be considered together in the design and use. With the further deepening of theoretical research and technical studies of dust removal equipment, such as design parameters, filtering mechanism, filter performance, device structure and working methods of cleaning, dust removal equipment in the paper industry to play a more production and environmental protection in big role. 3, the filter area is determined Dust filtration area can be determined based on the gas flow to be filtered and the filtration rate. Calculated as follows: A = (Q + QL) / V …… (3) Where: A– filtration area, m; Q– gas flow to be filtered, m · min; QL– ventilation and dust removal system air leakage, m, – like filter demand 15% -30% gas flow selected; V– filtration rate, m · min. 4, the number of bag N is the total number of bag filter area A divided by the surface area of a single book bags Ai (m). For round bags: Ai = пD · L, N = A · Ai.