The Selection of Dust Removal Filter Bag
The selection of dust removal filter bag must be careful, usually from the following aspects:气体的温度：
Gas temperature:
气体温度低于130℃选择常温除尘布袋，温度在130℃－260℃之间选择高温除尘布袋。
When the gas temperature is lower than 130 ℃, the normal temperature dust removal bag is selected, and the high temperature dust removal bag is selected when the temperature is between 130 ℃ and 260 ℃.
潮湿度：
Humidity:
含尘气体按相对湿度分为三种状态：干燥气体（相对湿度在30%以下），一般状态（相对湿度在30%-80%之间）和高湿气体（相对湿度80%以上）。当气体湿度高就应该选择覆膜防水布袋。
According to the relative humidity, the dusty gas can be divided into three states: dry gas (relative humidity below 30%), general state (relative humidity between 30% - 80%) and high humidity gas (relative humidity above 80%). When the gas humidity is high, you should choose the waterproof cloth bag.
化学性：
Chemical properties:
在各种炉窑烟气和化工废气中，常含有酸、碱、氧化剂、有机溶剂等化学成分。所在以选择除尘布袋滤袋时应根据烟气中所含有化学成分进行合理选择耐酸，耐碱、抗氧化的除尘布袋。
In all kinds of furnace flue gas and chemical waste gas, it often contains acid, alkali, oxidant, organic solvent and other chemical components. Therefore, the selection of dust bag filter bag should be based on the chemical composition contained in the flue gas, and the dust bag with acid resistance, alkali resistance and oxidation resistance should be selected reasonably.
过滤风速：
Filtration wind speed:
袋式除尘器的过滤风速过高，是除尘布袋损坏的主要原因。近年来，有些单位盲目的降低设备成本，增加利润，在设计袋式除尘器时，把过滤风速提高，短时 间内用户没有明显的反应，但是大大缩短了布袋的使用寿命，这样以来给客户非但没有省钱，反而带来非常大的经济负担，且浪费了时间。
The main reason of bag filter bag damage is that the filtering wind speed of bag filter is too high. In recent years, some units blindly reduce equipment costs and increase profits. In the design of bag filter, the filtering wind speed is increased. In a short period of time, users have no obvious response, but greatly shorten the service life of the bag. Thus, it not only does not save money to customers, but also brings great economic burden and wastes time.
粉尘性质：
Dust properties:
粉尘的湿润性和黏着性。粉尘的湿润性、浸润性是通过尘粒间形成的毛细管作用完成的，与粉尘的原子链、状态以及液体的表面张力等因素相关，可用湿润角来表征。通常称小于60度者称为亲水性，大于90度者称为憎水性。吸湿性粉尘在其湿度增加后，粒子的凝聚力、黏性力随之增加，流动性，荷电性随之减小，粘附于滤袋表面，久而久之，清灰失效，尘饼板结。
The wettability and adhesiveness of dust. The wettability and wettability of dust are achieved by capillary action formed between dust particles, which are related to the atomic chain, state of dust and surface tension of liquid, and can be characterized by wetting angle. Generally speaking, it is called hydrophilic when it is less than 60 degrees, and hydrophobic when it is greater than 90 degrees. When the humidity of the hygroscopic dust increases, the cohesiveness and viscosity of the particles increase, the fluidity and the charge of the particles decrease, and adhere to the surface of the filter bag. Over time, the dust removal fails and the dust cake hardens.
颗粒大小：
Particle size:
一般取过滤速度为0．5—2m/min，对于大于0．1?m的微粒效率可达99%以上，设备阻力损失约为980—I470Pa
Generally, the filtration rate is 0.5-2 M / min. for particles larger than 0.1? M, the efficiency can reach more than 99%, and the resistance loss of the equipment is about 980-i470pa
清尘方式：
Dust removal method:
布袋除尘器的清灰方法对除尘布袋的选择影响很大，决定着除尘布袋类型选择的前提条件。布袋除尘器采用什么类型的清灰方式可以首先决定除尘布袋(滤料)是织布、针刺毡、压缩毡还是除尘布袋(玻纤滤袋)。至于除尘布袋的详细规格和覆膜要求，可根据布袋除尘器工作的工况条件和过滤要求作进一步考虑。
The dust cleaning method of bag filter has a great influence on the selection of dust bag, which determines the precondition of bag type selection. What kind of dust removal method is used in the bag filter can first determine whether the dust removal bag (filter material) is woven fabric, needle felt, compression felt or dust removal bag (glass fiber filter bag). As for the detailed specifications and film covering requirements of the bag filter, further consideration can be given to the working conditions and filtering requirements of the bag filter.