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布袋除尘器的工作原理是什么

浏览次数: 发布日期:2020-11-05

关键词:布袋除尘器 除尘器

导读:布袋除尘器的工作原理是什么?当含尘气体通过滤料时,粉尘被阻留在其表面上,干净空气则透过滤料的缝隙排出,空气过滤技术是布袋除尘器的基本原理。

当含尘气体通过滤料时,粉尘被阻留在其表面上,干净空气则透过滤料的缝隙排出,空气过滤技术是布袋除尘器的基本原理。目前用于空气过滤的主要有纤维过滤、膜过滤(覆膜或薄膜)和粉尘层过滤,这三种方式都能达到将气溶胶中固体颗粒分离出来的目的,但它们的分离机理是不一样的。布袋除尘器的结构主要是由:上、中、下部、清灰系统和排灰机构等部分组成。布袋除尘器性能的好坏是除了正确的选择布袋的材料外,清灰系统对布袋除尘器起着重要的决定性作用。

布袋除尘器的工作原理是什么

袋式除尘器技术特点

除尘效率高达99%,除尘器出口的气体含尘浓度的数目在10mg/m2之内,对于亚微米粒径的细尘有这较高的分辨率,处理的范围很广泛,用于工业炉窑的烟气除尘,减少了大气污染的排放量,对于粉尘的特性不敏感,不受到粉尘和电阻的影响,采用玻璃纤维、P84等耐高温滤料和聚四氟乙烯时,可以在200℃以上进行,结构简单、维护方便、在同样的除尘效率下,也比电除尘器的造价低。

布袋过滤器所用滤料的网目较大,一般为20~50um,表面天鹅绒滤料约为5-10um。除尘设备它与口军的除尘机理一样,是通过滤材料对烟气中飞灰颗粒的机械栏截来实现的。但除此之外,先收到的飞灰颗粒在料表面还形成了一层稳定的稠密的灰层(一般称为 饼或床),它又起到了很好的过滤作用,特别是用编制布做滤线的除尘设备,这层滤床起到了主要的过滤作用。布袋除尘器一种干式i尘装置。它适用于捕集细小、干燥、非纤维性粉尘。浦袋采用纺织的滤布或非纺织的毡制成,利用纤维织物的过滤作用对含尘气体进行过滤,当含尘气体进入袋式除尘器后,颗粒大、比重大的粉尘,由于重力的作用沉降下来,落入灰斗,含有较细小粉尘的气体在通过滤料时,粉尘被阻留,使气体得到净化。因此,新型i袋的除尘效率仅为40%左右(1um粉尘),当含尘空气通过i料时,由于纤维的屏蔽、截留、碰撞、扩散和静电作用,粉尘留在演料上形成初始层。与过滤材料相比,多孔初始层具有更高的除尘效率。因此,布袋除尘器的过滤效果主要是根据这一初始层和其后逐渐积累的尘层来实现的。集公层厚度越大,,袋两侧的压差越大,除尘器的阻力损失越大,气体处理量越小。随着除尘行业的快速发展,我国除尘器生产领域还有很大的发展空间,需要通过对各种除尘附件和除尘设备的了解来确定我国下一步的发展方向。由于空气通过浦料孔隙的加速作用,降低了除尘效率。因此,除尘 运行一段时间后,进行清灰,除去公层,但不破坏初始层,不降低效率。

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不同滤料除尘机理的差异

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