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# Stoichometric Air Calculations For Solid Fuels In Btu Method

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### #1 krishanan

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Posted 27 April 2013 - 05:08 AM

Hi to all,

Please let me know how the following equations are arrived

Stoichometric air lb/lb of fuel = 11.53*C + 34.34*(H2 - (O2/8)) + 4.29*S - Equation-1

Stoichometric air lb/10kbtu = 144*((8.01*C + 23.86*(H2 - (O2/8)) + 3*S)/(HHV) - Eq.-2

Please help me out

Your reply is most appreciable

Rgds
krishna

### #2 breizh

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Posted 27 April 2013 - 05:23 AM

Google the equations :

11.53*C + 34.34*(H2 - (O2/8)) + 4.29*S

and you will get your answer

Breizh

### #3 krishanan

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Posted 27 April 2013 - 06:11 AM

Dear Breizh,

i couldn't get the answer.

anyhow thanks for your reply

Edited by krishanan, 27 April 2013 - 06:12 AM.

### #4 breizh

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Posted 27 April 2013 - 06:49 AM

http://yosemite.epa....E/SI 428A_2.pdf

http://nepis.epa.gov...ges=1&ZyEntry=4

It should help

Breizh

Edited by breizh, 27 April 2013 - 11:12 PM.

### #5 krishanan

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Posted 28 April 2013 - 05:42 AM

sir,

i couldn't understand how the second equation arrived. i.e. 144*((8.01*C + 23.86*(H2 - (O2/8)) + 3*S)/(HHV)

Please help me

### #6 breizh

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Posted 28 April 2013 - 06:53 AM

This equation is know as Dulong Formula for qualification of fuel

http://www.indiastud...ific-value.aspx

note : You need to pay attention to the units  .

Hope this helps you out.

Breizh

### #7 krishanan

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Posted 29 April 2013 - 11:40 AM

Dear breizh,

I am unable to open file, it says rejected due to poor quality

### #8 breizh

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Posted 29 April 2013 - 06:34 PM

http://powerplantcon...alculation.html

Let you try ! Pay attention to units .

Google should support you

Breizh

### #9 krishanan

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Posted 04 May 2013 - 10:55 PM

THANKS FOR YOUR REPLY MR.BREIZH I STILL COULDN'T UNDERSTAND HOW THE FACTOR 144 ARRIVED, COULD YOU PLEASE ELABORATE

### #10 breizh

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Posted 05 May 2013 - 12:32 AM

I can not help you more , I've added the relation based on energy from Babcok book .

Breizh

### #11 krishanan

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Posted 06 May 2013 - 10:38 AM

Dear breizh,

There is no content in the file

Please attach once again

### #12 breizh

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Posted 06 May 2013 - 07:36 PM

Dulong formula.(accuracy 2-3%)

HHV (Btu/lb) = 14,544 *C+62,028 *(H2-(O2/8))+4050*S

HHV (higher heating value); C:mass fraction of Carbon,.....H2 mass fraction of Hydrogen, O2 mass fraction of Oxygen and S mass fraction of sulfur.

Hope this helps

Breizh

### #13 Shivshankar

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Posted 07 May 2013 - 09:38 AM

Krishnan,

Your 1st equation might be wrong.Is it divided by 100 ?

Give us reference where you got that equation from

Check attached copy.

Regards

Shivshankar

#### Attached Files

•  eq.bmp   1.78MB   9 downloads

Edited by Shivshankar, 07 May 2013 - 10:03 AM.

### #14 krishanan

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Posted 09 May 2013 - 12:25 PM

ya, you are right Mr.Shivasankar, It should be devided by 100, but i am not understanding how this 144 comes, is this a common product of all constituents.

Please provide me the full document of your attachment

### #15 krishanan

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Posted 09 May 2013 - 12:26 PM

Thank you very much Mr.Briezh