Re: Inverted W Duct Layouts/Design
James,
Why are ducts on cement plants steeply inclined?
Horizontal ducts are common for dust extraction in other industries, as long as the velocities are high enough I can't immediately think of a reason why there should be a problem using horizontal ducts on a cement plant. You can certainly pneumatically convey cement in horizontal pipes.
They reason for the steep duct isn't that they use the heat from the kilns to generate a chimney effect which gives the ventilation flow for "free", without the need for or reducing the size of the exhaust fans or something like that, is it?
Or is it something to do with the nature of the product at that stage of the manufacturing process? ■
Ducting Design Experts
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Inverted W Ducts
James,
There is no reason for ducts to be configured this way, in cement plants or anywhere else, providing the design is done properly. That is, ducts should be sized to maintain conveying velocity under all conditions.
I have seen an inverted 'V' arrangement used to connect two adjacent silos where the silos are pneumatically loaded with the same product but only one is equipped with a dust collector. The steep inverted V duct prevents dust settlement.
Michael Reid. ■
Inverted W Duct Layouts/Design
Hi All,
In cement plants, de-dusting ducts are steeply inclined from the take off points to the dust collector. In some applications, this can result in very tall ducting layouts.
I am wondering if anyone has experince in an inverted W duct design ie the duct rises up/down to an intermediate low point and then back up/down again to the dust collector.
At the intermediate low point, there would be a air tight dust valve to release dust fallout.
Any comments appreciated.
Thanks
James M ■