The advantages and disadvantages of positive pressure dust removal and negative pressure dust removal of bag dust collectors: (1) positive pressure dust removal system. The positive pressure (also known as pressure in type) dust collector has an internal gas pressure higher than atmospheric pressure, and the positive pressure bag dust collector's induced draft fan is installed at the inlet end of the dust containing flue gas in the dust collector, which generates positive pressure inside the dust collector wall, making it easy to introduce dust or corrosive flue gas into the dust collector and difficult to install indoors, It is also difficult to handle highly toxic dust containing smoke.

但含塵或腐蝕物煙氣通過風機內部，容易對風機造成損傷及磨損；正壓式袋式除塵器的特點是外殼結構簡單輕便，密封性要求不高，造價低，且布置緊湊。

However, smoke containing dust or corrosive substances passing through the interior of the fan can easily cause damage and wear to the fan; The characteristics of positive pressure bag filter are simple and lightweight shell structure, low sealing requirements, low cost, and compact layout.

正壓除塵系統中的除塵器應設置在通風機之后。其特點如下。

The dust collector in the positive pressure dust removal system should be installed after the ventilation fan. Its characteristics are as follows.

①由于除塵器設置在通風機后，含塵氣體未經除塵器凈化先流過通風機，通風機的葉輪和機殼極易遭粉塵磨損。因此正壓除塵系統只適用于氣體含塵濃度小于3g/m3，粉塵磨損性弱、力度小的情況。

① Due to the dust collector being installed behind the ventilator, the dusty gas flows through the ventilator before being purified by the dust collector, making the impeller and casing of the ventilator highly susceptible to dust wear and tear. Therefore, the positive pressure dust removal system is only suitable for situations where the dust concentration in the gas is less than 3g/m3, the dust wear resistance is weak, and the force is small.

②由于除塵器處于通風機的正壓段，不必考慮除塵器的漏風率，通風機電耗較低。

② Due to the fact that the dust collector is located in the positive pressure section of the ventilator, there is no need to consider the air leakage rate of the dust collector, and the mechanical and electrical consumption of the ventilator is relatively low.

③除塵器的維護結構簡單，如正壓袋式除塵器的維護結構不需要密封，只需采取防雨措施即可；設備制造與安裝簡便，造價低。

③ The maintenance structure of the dust collector is simple, for example, the maintenance structure of the positive pressure bag filter does not need to be sealed, only rainproof measures need to be taken; The equipment manufacturing and installation are simple and low in cost.

④除塵器有一定的消聲作用，通風機出口側可不設消聲器；有利節約除塵系統占地，減少初始投資。

④ The dust collector has a certain noise reduction effect, and there may not be a silencer installed on the outlet side of the fan; Beneficial for saving dust removal system land and reducing initial investment.

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