But even if it is a ventilation pipe is also divided into several, there is a simple dust, smoke, exhaust pipe, but also have a special rule out harmful gas pipeline.

但就算是通风管道也分成好几种，有简单除尘、排烟、吸油的排风管，但也有专门排除有害气体的管道。

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The exhaust noise generated by a pressure switch is silenced by the exhaust silencer through the pipeline and then diffused in the big cavity, and the noise is significantly reduced.

压力开关产生的排气噪音通过管路到排气消声器消音再到一个大腔体中扩散，使噪音明显降低。

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Based on In-pipe clearing ash robot in exhaust gas pipeline of metal smeltery object, the scheme of in-pipe clearing ash robot with track to clean out ash in pipe is put forward.

分析了火电厂灰水管道结垢的原因 ，介绍了目前采用和研究的几种清洗技术 ，并对几种清洗技术进行了比较。

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