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K P Anoop Moosad
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Join Date: May 2010
Posts: 4

Pressure Compensation for Secondary (Combustion) Air Flow in Boiler

05/22/2010 4:58 AM

Is pressure compensation is required for mass flow measurement of secondary air in boiler?

The primary element is McOn Air (Promecon) sensor. McOn Air measures velocity of air in the duct. Thermocouples are available in the section for temperature compensation.
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Ace Boeringa
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United States - Member - New Member Engineering Fields - Control Engineering - New Member

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Location: Washington USA
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#1

Re: Pressure compensation for secondary(combustion) air flow in boiler.

05/22/2010 9:24 AM

Yes, pressure compensation is required for accurate mass flow measurement with your primary element according to the manufacturer.

http://promecon.us/Brochures/Air.pdf

Read the paragraph in the lower left corner of the brochure.

Some technologies (ie, thermal dispersion) can be used to measure mass flow without pressure compensation.
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ducon
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Location: Hop around Toronto, New York & Karachi
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#2
In reply to #1

Re: Pressure compensation for secondary(combustion) air flow in boiler.

05/23/2010 1:17 AM

Ace you an ace

__________________
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rajant_2001
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Join Date: Jan 2007
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#3

Re: Pressure Compensation for Secondary (Combustion) Air Flow in Boiler

05/27/2010 7:45 AM

The pressure compensation for secondary air flow is not much critical as the correction factor density variation is very small. The normal secondary air pressure may be arround 400mm of wcl. The variation in pressure may be + or _ 50mm. Hence the correction factor is 10450/10400 or 10350/10400 respectively that is 1,0048 or 0.9952. This is very negligible. However correction is required for change of temperature for accurate flow measurement.

R.Thiyagarajan
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Re: Pressure Compensation for Secondary (Combustion) Air Flow in Boiler

11/10/2010 12:23 PM

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