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                                              袋式除尘器?#26800;?#38500;尘布袋及滤料

                                              作者: 发布时间:2017-05-26 浏览次数:96

                                                袋式除尘器是依靠除尘布袋对烟气中固体微粒的截留使烟气得以?#25442;?#30340;。除尘布袋是袋式除尘器的心脏。近年来对这工业设备的大型化,布袋除尘器的大型化随之而来。

                                                八十年代?#20445;?#38500;尘器单机处理风量多在3000m3/h~30000m3/h,处理风量达到50万m3/h的已算大型除尘器了,鲜有处理风量在100万m3/h以上的。但近年来处理风量在100万m3/h以上的袋式除尘器应用已很普遍。例如600MW火电机组、日产5000t的水泥旋转窑、2000m3炼铁高炉等大型设?#25913;?#21069;均为常见设备。用于这些大型设备的除尘器多是处理高温烟气,所用滤袋多为耐高温滤料,不仅除尘器的费用大大提高,而且使得滤料在除尘器总费用?#26800;?#27604;重从1/8上升到1/3以上,从而对滤袋质量与性能的要求有了很大的提升。

                                                滤料分为二维滤料、三维滤料和覆膜滤料三种结构:

                                                二维滤料:是平面交叉的经纬纱线机织布,织物孔隙度大,粉尘穿透率高,在滤料迎风面?#32428;?#30340;一次粉尘层,在粉尘过滤过程中被保留,起主要过滤作用,如"729"、"208"?#31570;?#32420;布等。玻纤布经过硅油、石墨或特氟龙处理,可提高耐磨性和抗酸碱等化学腐蚀性能。

                                                三维滤料:是在机织布中刺入排列松散?#21335;?#32500;,?#32428;?#31354;间交叉的、密集?#21335;?#32500;层。滤料在带负荷的工作中,粉尘在滤料内部滞留,?#32428;?#19968;个容尘梯度,处于平衡状态,粉尘和滤料交叉给合为一个整体。共同起过滤作用。滤料表面被阻留的粉尘层,在清灰时必须全?#22771;?#38500;。滤料表面经过烧毛、?#26500;狻?#28034;层、浸渍等处理后,具备防水、防油性能,并可改善和提高过滤效率和清灰效果。

                                                覆膜滤料:采用聚四氟乙烯原料膨化为一种立体网状结构,表面光滑稳定的微孔薄膜覆?#26174;?#20108;维滤料三维滤料的基材上,?#32428;?#19968;种微孔薄膜覆合滤料。滤料在带负荷的工作中,粉尘全部被阻留在膜的外表面,清灰时全部被清除掉,覆膜起主要过滤作用。滤料经覆膜后具有孔径小,透气率高、阻力小、过?#21496;?#24230;高、有综合的化学稳定性等特点,被广?#27827;?#29992;。


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