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循环流化床锅炉布袋除尘器的除尘器滤袋介绍及其特性

发布时间:2017-05-14
循环流化床锅炉除尘器滤袋与其他燃用固体燃料的锅炉   主要的区别是其燃料(包括惰性炉料..

循环流化床锅炉除尘器滤袋与其他燃用固体燃料的锅炉   主要的区别是其燃料(包括惰性炉料)颗粒处于流态化的燃料反应与热交换的过程。以煤为例,其颗粒度大小介于层燃炉块煤和粒煤与煤粉炉的煤粉之间(一般为1-1O)。在气流的作用下,气流的吹托力和颗粒在气流中的浮力之和大于或等于颗粒的重力时,颗粒就可漂浮起来。颗粒间的距离扩大,并能在   的高度范围内作   程度的移动。随着气流速度的提高,颗粒层高度增加,颗粒运动加剧,上下翻滚,好像液体在沸点时的沸腾现象,燃料在这种状态下燃烧称为流化燃烧。燃料颗粒在炉膛中,质量密度较大的颗粒被气流带到   高度,因为力的平衡关系而悬浮在   的空间区域内。由于流动结构因素,颗粒问碰撞等而引起向四面八方运动,形成横向或纵向翻滚返混。质量密度大的颗粒在炉膛下部(密相区)燃烧、分解与破碎,形成小颗粒;质量较小的颗粒被气流托向炉膛上部(稀相区)继续燃烧。对于循环流化床来讲,一般的流化速度较高,小颗粒被吹起很多,在稀相区产生很高的颗粒浓度,以至于炉膛出口烟气物料浓度依然很高,大量的细物料被带到炉膛出口,而经分离器捕集后,由回料装置送到炉膛。简要的说,有大量的物料在炉膛一分离器一回料器一炉膛之间循环,这就是循环流化床锅炉除尘器燃烧区域二相流的重要特征。

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