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How To Derive Specific Heat Of Flue Gases

flue gases specific heat

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#1 MohitBansal

MohitBansal

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Posted 18 March 2014 - 11:51 PM

hi

I am having difficulties to get the mean specific heat of flue gas.please help me in this asap.

flue gas compositions-

O2 = 11.10 %

CO2 = 6.9 %

CO = 380 ppm

excess air = 109 %

Load = 15.65 TPH

Ambient temp. = 27 oC

Flue gas temp. at outlet = 190 oC

F.D. = 60 RPM

I.D. = 99 RPM



#2 Santoshp9

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Posted 25 March 2014 - 01:26 AM

Dear Mohit,

Take specific heat of each constituent at flue gas temp & multiply it with respective mole fraction of constituent and add all ,it gives you mean specific heat of flue gas.

Mean Sp Heat of flue gas at 190 degC  = h.O2*mf O2 +h.CO2*mf CO2 +h.CO*mf CO +h.H2O*mf H20 +h.N2*mf N2.

 

h= Sp. Heat(Kcal/kgdegC)

mf = Mole fraction

 

Regards,

Santosh



#3 chemdoc

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Posted 25 March 2014 - 03:22 AM

the procedure suggested by Santoshp9 is correct but

take care to use the correct units,

if specific heats are mass based (i.e. Kcal/KgC) use weight fractions,

if specific heats are mole based (i.e. Kcal/KgmolC) use molar fractions,



#4 aroon

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Posted 25 March 2014 - 03:42 AM

Any available process simulation tool can also be used to have better picture.






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