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负压气力输送设备有哪些组成部份?

发布时间:2020-01-15 16:43

负压气力输送系统指利用压风机(真空泵)产生系统负压,将在受料器处与空气均匀混合的粉粒状物料通过管道抽送至贮料装置的输送系统,主要用于燃煤电厂的灰处理系统,又称负压气力除灰系统,为国外引进技术,其系统设计技术已为国内除灰系统设计人员完全掌握。

负压气力输送系统投资较省,可以多点受料,要求灰斗下部的净空较小,适用于300MW及以下火电机组的除灰系统,且由于设备和管路在真空状态下只能发生内泄漏,因而环境比较清洁。缺点是由于负压值有限,因而输送距离较短,一般输送的几何距离为200m,实际工程宜按≤150m设计;单个系统的出力一般40t/h的(粉煤灰)。

负压气力输送设备通常由物料输送阀、进气止回阀、输送管道及阀门、灰气别离设备、贮灰库及辅佐设备、负压风机和操控设备等构成。物料输送阀又称E形阀,作为受料器的输送阀是负压设备的关键设备之一,其作用是经过物料输送阀上的补气阀和灰量调理设备的作业,使灰斗内的灰与空气均匀混合,灰气混合物具有杰出的流动性,可使其顺畅进入输送管道,以确保输送设备高效、晓畅地运转。物料输送选用气支操控,其阀体和阀具有杰出的耐磨性。

负压气力输送系统运行图

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