1. Determine the dust bag filter area : dust bag and bag filter efficiency of nature , the filtration rate , gas and dust concentration continuous running time and other factors , and these factors are interrelated and interacting , and therefore a comprehensive analysis of the design parameters should be chosen in a bag filter equipment and comprehensive consideration . 2 , To determine the specifications of the dust bag : bag size ( length L and diameter D) of the gas into the bag inlet velocity when a dusty gas to enter each bag , when the population V1 speed is too fast, on the one hand will accelerate . secondary cleaning dust flying , on the other hand because of the dust bag makes friction wear sharp increase , it is generally V1 can not be too much. of course , the bag filter equipment and air volume fan pressure and other parameters are dust accessories will directly affect the effect of dust , it should be considered in conjunction with the design / use. with the deepening / design parameters such as / filtering mechanism / filter material / device structures and methods of cleaning bag filter theory and technology studies further research work , bag filter equipment to play a greater role in the production and environmental protection in the paper industry .