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压滤机滤布上的附灰层在过滤过程中的作用

发布时间:2018-05-22 11:24作者:杭州益清过滤材料有限公司

由过滤除尘的机理可知附灰层在实际除尘过程中起了非常重要的作用,滤布表面的附灰层,由大小不同的灰尘颗粒组成,具有各种结构性质和孔隙性,在正常情况下,它影响布袋除尘器的除尘效率和阻力,决定运转性能。滤布是形成粉尘层和支撑粉尘层的骨架。
 
 1.过滤除尘过程中,附灰层的作用
 
(1)附灰层足够厚时,可以实现很高的除尘效率。
 
(2)附灰层薄或多孔隙时,透气性好,除尘阻力和除尘效率低。
 
(3)附灰比重大时,淸灰时表现的惯性大,受振后容易和滤袋表面分离,加强清灰效果。
 
(4)附灰层粘性大时,不易清灰,阻力也高,
 
2.附灰层的生成过程      
 
大致可分为三个阶段。
 
(1)新滤布开始陡用后的几分钟或几小时内,灰尘填塞滤布孔隙过程。
 
(2)滤布使用几个星期或更长一些时间后,多次淸灰,直至建立稳定的剩余附灰层为止。
 
(3)每次从滤袋清下的灰量,约等于后一次清灰前积附在滤袋上的灰量,而且在清灰条件不利的情况下,阻力也相同。
 
According to the mechanism of filter dust removal, the ash layer plays a very important role in the actual dust removal process. The dust layer on the surface of the filter fabric is composed of different size dust particles. It has various structural properties and pore properties. Under normal conditions, it affects the efficiency and resistance of the bag dust collector and determines the performance of the dust collector. Filter cloth is the framework for forming dust layer and supporting dust layer.
 
1. the effect of the ash layer in the process of filtering and dust removal
 
(1) high ash removal efficiency can be achieved when the ash layer is thick enough.
 
(2) when the ash layer is thin or porous, the air permeability is good, and the dust removal resistance and the dust removal efficiency are low.
 
(3) when the ash density is large, the inertia of the ash is large, and it is easy to separate from the surface of the filter after vibration, so as to enhance the ash removal effect.
 
(4) when the ash layer is sticky, it is not easy to dedusting and the resistance is high.
 
The formation process of the 2. ash layer
 
It can be roughly divided into three stages.
 
(1) in the next few minutes or hours after the new filter begins to be used, dust filters the pore process.
 
(2) after several weeks or longer, the filter cloth will be repeated until the stable remaining ash layer is established.
 
(3) the amount of ash from the filter bag each time is equal to the amount of ash on the filter bag before the last cleaning, and the resistance is the same in the case of unfavorable conditions.

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