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Excess Air In Fired Heaters
#1
Posted 13 July 2021 - 01:07 AM
I need help how I can calculate the excess air required for fired heater natural draft?
Thanks for your support
#2
Posted 13 July 2021 - 06:10 AM
Total amount of air - Stoichiometric amount of air to burn the fuel = Excess air
#3
Posted 13 July 2021 - 06:25 AM
#4
Posted 13 July 2021 - 08:02 AM
Hi,
To support your calculation , a doc attached .
Note : For existing unit let you try an ORSAT testing equipment to optimize the combustion .
Good luck
Breizh
#5
Posted 13 July 2021 - 12:15 PM
Our site owner made available a downloadable spreadsheet which might be helpful:
https://www.cheresou...ir-calculation/
#6
Posted 14 July 2021 - 04:10 AM
Yes I am looking for calculation
Heat duty 61G cal/hr
10% excess of air which corresponds to 2.09/1.7% vol. dry/wet basis O2 in flue gases
Dear Pilesar
The document which you sent is very useful but we have Fuel gas instead of Fuel oil
#7
Posted 13 August 2021 - 01:59 AM
Since it is natural draft furnace, difficult to verify amount of excess air. Observe the burner flame color. There might be O2 analyzer in flue gas. It should be within 3% O2 in flue gas. Analyzer should work fine, otherwise depend on the flame color, and CO/O2in flue gas.
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