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Flue Gas pressure drop

Flue Gas pressure drop

Flue Gas pressure drop

(OP)
Hi all,

I'm struggling to find literature that addresses the calculation of pressure drop trough superheaters and economisers.  I only manage to find literature that is related to small geometrical setups, such as Kays&London. Any help would be appreciated for I need the total draught group resistance to characterise the FD en ID fans.  

Regards,

Philip Oosthuizen
Company info:
SteinMuller Engineering Services
http://www.steinmuller.co.za/

RE: Flue Gas pressure drop

I guess the best book you can find to introduce you to these kind of calculations is:

COMBUSTION
FOSSIL POWER SYSTEMS
Joseph G. Singer

This book was published by Combustion Engineering CE (Now part of Alstom Power) and is not for sale, but you can get second hand copies in Amazon.com or you can find it in many libraries.

Javier Guevara E.
Projects, Mechanical Engineer
TERMOGUAJIRA - GECELCA S.A. E.S.P.

RE: Flue Gas pressure drop

Why don't you contact the manufacturer of your boilers/economizers?  They will be your best and quickest route.

RE: Flue Gas pressure drop

There are other factors to be considered. Structural reinforcement - stiffeners- used inside the flue and casing can lead to high local velocities and high DP. Dampers and bypasses to allow low load use of the SCR also add DP.

For accurate prediction, some people use scale models ( Nels lab) or 3D CFD, but accurte representation of the stiffeners is mandatory.

large Margins are added to ID fans- to account for firing  off design fuel, high XS air operation, fouling, higher than design gas temp, etc.

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