布袋除尘器除尘系统按照除尘器和通风机在流程中的相对位置，可以分为负压除尘系统和正压除尘系统。那布袋除尘器的这两种系统有什么区别呢？

The bag filter dust removal system can be divided into negative pressure dust removal system and positive pressure dust removal system according to the relative position of the dust collector and the ventilation fan in the process. What is the difference between these two systems of bag filter?

（1） 布袋除尘器负压除尘系统

(1) Bag filter negative pressure dust removal system

负压除尘系统中，除尘器设置在通风机之前（负压段或吸人段）。其特点如下所述：

In the negative pressure dust removal system, the dust collector is set before the ventilation fan (negative pressure section or suction section). Its characteristics are as follows:

① 由于除尘器设置在通风机之前，流过通风机的气体已经过除尘，含尘浓度低，通风机受磨损大大减低，运行寿命长，处理初浓度高的含尘气体时，一般采用负压除尘系统。

① Due to the fact that the dust collector is installed before the ventilation fan, the gas flowing through the ventilation fan has already undergone dust removal, resulting in a low dust concentration and greatly reduced wear and tear on the ventilation fan. With a long operating life, a negative pressure dust removal system is generally used when dealing with high initial concentration dust containing gases.

② 除尘器和管道处于通风机的负压段，容易吸入空气，产生漏风。负压除尘系统的漏风率为5%～10%，加大了通风机的风量，增加了电耗。

② The dust collector and pipeline are located in the negative pressure section of the ventilation fan, which is prone to inhaling air and causing air leakage. The air leakage rate of the negative pressure dust removal system is 5% to 10%, which increases the air volume of the ventilation fan and increases power consumption.

③ 在负压除尘系统设计中应采用措施尽可能减少除尘器和管道的漏风，以保除尘器的良好运行。

③ In the design of negative pressure dust removal systems, measures should be taken to minimize air leakage from the dust collector and pipelines as much as possible to ensure the good operation of the dust collector.

（2） 布袋除尘器正压除尘系统

(2) Positive pressure dust removal system of bag filter

正压除尘系统中，除尘器设置在通风机之后（正压段或压出段）。其特点如下所述：

In a positive pressure dust removal system, the dust collector is installed after the ventilation fan (positive pressure section or extrusion section). Its characteristics are as follows:

① 由于流过通风机的含尘气体未经除尘器净化，通风机的叶轮和机壳易遭粉尘磨损。因此，正压除尘系统只适于在气体含尘浓度3g/m3以下、粉尘磨琢性弱、粉尘粒度小的条件下使用。

① Due to the untreated dust containing gas flowing through the ventilation fan, the impeller and casing of the fan are susceptible to dust abrasion. Therefore, the positive pressure dust removal system is only suitable for use under conditions where the gas dust concentration is below 3g/m3, the dust abrasion is weak, and the dust particle size is small.

② 除尘器处于通风机的正压段．不必考虑除尘器的漏风附加率，通风机电耗较低。

② The dust collector is located in the positive pressure section of the ventilation fan. There is no need to consider the additional air leakage rate of the dust collector, and the power consumption of the ventilation fan is relatively low.

③ 除尘器的围护结构简单，如正压袋式除尘器的围护结构不需要密封，只要防雨即可；设备制造，安装简便，造价低。

③ The enclosure structure of a dust collector is simple, such as the enclosure structure of a positive pressure bag filter, which does not need to be sealed and only needs to be rainproof; Equipment manufacturing, easy installation, and low cost.

④ 布袋除尘器正压除尘系统中，净化后的气体直接由除尘器排入大气，可不设烟囱；除尘器有一定的消声作用，通风机出口侧可不设消声器；有利节约除尘系统占地和初期投资。

④ In the positive pressure dust removal system of the bag filter, the purified gas is directly discharged into the atmosphere through the filter, and there is no need to install a chimney; The dust collector has a certain noise reduction effect, and there is no need to install a muffler on the outlet side of the ventilation fan; Beneficial for saving dust removal system land and initial investment.

单机除尘器设备使用正压或者负压的区别

The difference between using positive pressure or negative pressure in a single dust collector equipment

购买单机除尘器设备或者其他类型的袋式除尘器设备的时候，很多的朋友都会问：你们采用的是正压方式还是负压的方式？其实除尘器设备无论使用正压和负压都是没有问题的。不过是在条件允许的情况下进行合理设计就好。

When purchasing standalone dust collector equipment or other types of bag filter equipment, many friends will ask: Do you use positive pressure or negative pressure? In fact, the dust collector equipment has no problem using both positive and negative pressure. Just design it reasonably if conditions permit.

下面详细的给您介绍下关于单机除尘器设备使用正压或者负压的区别？工作条件下都有哪些的好处和坏处？

Below is a detailed introduction to the difference between using positive pressure or negative pressure in a single dust collector equipment? What are the benefits and drawbacks of working conditions?

1、单机除尘器在净化粉尘的时候含尘气流进入滤袋的方向有向外式和向内式。前者含尘气流进入滤袋内部，由内向外过滤，粉尘积于滤袋内表面。

1. When purifying dust, the direction of the dusty airflow entering the filter bag in a single dust collector can be outward or inward. The former dusty airflow first enters the interior of the filter bag and is filtered from the inside out, causing dust to accumulate on the inner surface of the filter bag.

向外式的滤袋外部为干净气体侧，便于检查和换袋。

The outward facing filter bag has a clean gas side for easy inspection and bag replacement.

向内式的含尘气流由滤袋外部通过滤料进入滤袋内，净化后的气体由袋内排出。向内式适用于脉冲喷吹和高压气流反吹的布袋式除尘器。

The inward type dusty airflow enters the filter bag through the filter material from the outside, and the purified gas is discharged from the inside of the bag. Inward type is suitable for bag type dust collectors with pulse blowing and high-pressure airflow back blowing.

2、负压的除尘系统中风机置于除尘器的后面，使除尘器处于负压，含尘气流被吸入除尘器中进行净化。这种方式的特点是进入风机的气流是已经净化的气流可以防止风机被磨损。

2. The fan in the negative pressure dust removal system is placed behind the dust collector to maintain negative pressure, and the dusty airflow is sucked into the dust collector for purification. The characteristic of this method is that the airflow entering the fan is already purified, which can prevent the fan from being worn out.

正压式的除尘系统中风机置于除尘器的前面，除尘器在正压下工作。正压式的特点是管道布置紧凑，对外壳结构的强度要求不高，但风机易磨损，不适用于浓度高，颗粒粗，硬度大，磨损性强的粉尘。

The fan in the positive pressure dust removal system is placed in front of the dust collector, and the dust collector works under positive pressure. The characteristic of positive pressure is that the pipeline layout is compact, and the strength requirements for the shell structure are not high. However, the fan is prone to wear and is not suitable for dust with high concentration, coarse particles, high hardness, and strong wear.

单机除尘器正压和负压使用的区别滤袋形状有圆袋和扁袋。前者结构简单，便于清灰。后者占空间小，单位体积内所布置的过滤面积大;但结构和清灰较复杂，换袋困难，滤袋与骨架的磨损较大。因此工业中大多采用圆袋。

The difference between positive pressure and negative pressure in a single dust collector is that the filter bag shapes include round bags and flat bags. The former has a simple structure and is easy to clean. The latter occupies less space and has a larger filtering area arranged per unit volume; But the structure and dust removal are complex, making it difficult to replace the bag, and the wear of the filter bag and the skeleton is significant. Therefore, circular bags are mostly used in industry.

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