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# Burner Capacity Curves

fired heater process burner burner capacity curve heat release

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### #1 Sherif Morsi

Sherif Morsi

Gold Member

• Members
• 172 posts

Posted 01 November 2019 - 09:53 AM

Hi,

I calculated the total heat resulting from firing FG in a process heater by multiplying the total gas flow by the LHV of the gas

LHV = 949 Btu/SCF

Flow = 115,000 SCFH

Q1 = 109.14 MMBtu/hr

I also pulled out the capacity curve of the burners and at 11 psig gas pressure, the heat release per burner is 9 MMBtu/hr.

Q2 = 23 burners x 9MMBtu/hr = 207 MMBtu/hr

If I am not mistaken, capacity curves are for a specific gas composition and properties.

Why is there such a big difference between the two calculated values given that I am using the same gas properties? P.S: The FG Mol wt is 18 in the datasheet vs. actual Mol wt of 17.6 for the current FG used.

Thanks

Sherif

### #2 breizh

breizh

Gold Member

• Forum Moderator
• 4,970 posts

Posted 01 November 2019 - 09:58 PM

Hi Sherif,

Consider the link above , better If you have a chance let you find this book (reference below)

The John Zink Hamworthy Combustion Handbook: Volume 1 - Fundamentals

Note : I found a value of HR # 4 MMBtu/h for methane at the # 11psig. Should not be very different from your gas specification ?  LHV # 910 BTU/scf .

Probably good to review your data .

My 2 cents

Breizh

Edited by breizh, 03 November 2019 - 12:31 AM.