除尘器的选择从国内外文献及国内工业实践经验来看，目前用于金属粉尘净化回收的设备主要有以下四种：①袋式除尘器；②静电除尘器；③高能湿式文氏管除尘器；④多管旋风除尘器。通过从技术、经济等方面对上述几种除尘设备进行比较，并针对本工程中烟气的特点，选用防爆型低压脉冲袋式除尘器作为粉尘处理回收的设备，并选用防静电尼龙针刺毡作为滤料。该类除尘器有如下特点：①运行稳定，易于清灰，维修方便；②喷吹装置阻力小，处理能力大，除尘效率高；③设备重量轻、投资省、造价低、占地少。
因此，袋式除尘系统处理烟气量为：Q=2712×1.1=2983m3/h.除尘器过滤面积及过滤风速除尘器过滤面积可根据下式计算：F=Q60V(1)式中：F为除尘器过滤面积，㎡；Q为系统处理烟气量，m3/h；V为过滤风速，m/min。过滤风速的大小与清灰方式、清灰制度、粉尘特性、入口含尘浓度等因素有密切的关系。根据经验，过滤风速取V=1.0m/min，则除尘器的过滤面积为F=49.7㎡。
根据以上计算，设计中选用LDM-50防爆型低压脉冲袋式除尘器，其处理烟气量为3000m3/h，过滤面积为50㎡。工艺流程说明及主要技术措施熔炼炉烟气通过不锈钢风管进入布袋除尘器，再通过引风机高空排放，除尘器料斗收集的粉尘进入料桶，放入料库贮存，可作为原料再次使用。在每台熔炼炉的吸风罩顶端安装一个电动阀，其信号与变频器的相连，使得变频器可根据电动阀的开启数量自动调节风机风量，且操作系统与熔炼炉操作系统合用一个控制柜，操作起来十分方便。在稀土贮氢合金粉烟气除尘系统中，关键是要解决稀土贮氢合金粉粉尘在空气中易燃易爆的问题，对此系统设计采取了以下技术措施加以防范：
①用不锈钢管作为通风管道，不会引起燃烧。
②采用防爆型低压脉冲袋式除尘器，在除尘器中箱体设有防爆门，发生爆炸时可迅速开启卸压，保障设备安全。
③选用防静电尼龙针刺毡作为滤料，从而避免静电放电产生的火花引起的粉尘爆炸。
④由于用压缩N2作为脉冲喷吹气体，从而避免了粉尘与空气摩擦引起的爆炸。
袋式除尘系统工艺特点在本系统中，由于贮氢合金粉为易燃易爆的金属粉尘，所以采用局部通风的方式进行除尘。本工程中采用压缩N2为保护性气体，并配置了一台产能为40m3/h的制氮机组，所以在本系统中采用压缩N2作为脉冲清灰气体。选用防静电尼龙针刺毡作为滤料，从而避免了因静电放电产生火花引起的粉尘爆炸，另外，在中箱体设有防爆门，提高了设备正常使用的安全性和可靠性。同时采用可编程控制器(PLC)进行自动控制及远程操作，使本系统操作起来非常方便。
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