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Shakuna
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Join Date: May 2008
Posts: 1

How flow and discharge head of a blower affects inlet conditions?

05/24/2008 3:33 AM

We have a stream 6000 m3/hr of hot flue gases at 5 kPa. We want to extract 5500 m3/hr of flue gas from it and discharge at 90 kPa without disturbing inlet pressure of 5kPa (i.e. without creating any vacuum at the inlet). Is it possible to do it? Is it possible with a blower? I think ID fan will creat vacuum at the inlet.
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Gasman
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Join Date: Jan 2006
Location: Western flank of the Pennines in Lancashire England
Posts: 93
Good Answers: 8
#1

Re: How flow and discharge head of a blower affects inlet conditions?

05/25/2008 6:51 AM

As usual with general questions there is not enough detail to give a definitive answer. The position of the new branch relative to the source of the hot gas stream, the source of the 5kPa pressure, the resistance to flow of the duct downstream of the new branch will all influence the result.

If the branch to the new "fan" is close to the source of the hot gas and most of the resitance is downstream of the branch then taking 5500m3/h off that will reduce the pressure at the branch to virtually zero. Regardless of this a centrif fan with a duty of 500m3/h will not pull the pressure down below atmospheric as long as the source is greater then the sink.

I would use a fan sized for the duty and fit a VSD with a pressure transducer to maintain the pressure in the supply duct at 5kPa.
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