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Fired Heater Efficiency Aspen Edr
#1
Posted 19 May 2018 - 09:34 PM
I have maintained excess air to the tune of 15 percent in fired Heater Aspen EDR. But still I m not getting desired flue gas temp at the radiation section outlet. Also I have made Stack temp loss in EDR as zero as my understanding is that Datasheet gives convection section outlet temp and not stack outlet temp. Is it correct understanding ? Also in my case 4 heaters radiation section flue gas goes to common convection box.For radiation section of heaters, i got thermal efficiency as 55 percent only..Also I want to know how Fuel gas Heavy Aromatic Naphtha composition in my case plays a role in outlet flue gas composition.
Please help me. In Aspen EDR, my tube areas are matching with that of Datasheet values.
Regards,
Chetan Chavan
#2
Posted 19 May 2018 - 09:38 PM
#3
Posted 20 May 2018 - 08:25 AM
Chetan, you are explaining the problema as if we knew what your situation is and what issue you are trying to troubleshoot by doing this simulation. Also, what variables are fixed,what are you calculating, what mode are you running EDR (design, simulation, rating) etc? etc?
55% exchange in radiation section may be a good value. So the "only" may depend on your specific application.
Then "Fuel gas Heavy Aromatic Naphtha" is something difficult to understand. ¿Are you burning heavy aromatic naphta?
What do you mean by "desired". It is a very vague term: It is what your manager desire, what you measure in actual operation or what is stated in the original datasheet?
Your second post makes it worse. You increased the process flow (where the heat duty depends on Cp) but then compare with the LHV of the fuel (without specifying the units. It is that kcal/kg? per liter? per Nm3?)
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