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[nishantril]

hello everyone..!

I work in an petrochemical industry..! we have a natural draught furnace..!

I have proposed use of air preheater which would heat the incoming air with the help of stack gases..! We are releasing stack gases at 300 C but we can bring it down till 150 C..! But they rejected saying it is not feasible because it would be difficult to maintain FD & ID fan and also the cost of air preheater..!! I objected by saying that if we preheat the air with stack gases we would require less fuel which would lessen the cost of operation.. But again they rejected my proposal saying that the fuel we use is very less for furnace to give that much payback period..

I want to know what are the factors which decide which type of furnace to be used..?

and I also I would be thankful if anyone gives me sufficient data, links and books for the same..!!

[Zauberberg]

Nishantril,

 

Air preheaters cannot be used in natural-draft furnaces, the simple reason being that there is no available force to drive the air across the preheater tubes. If you install a preheater in such a furnace, the burners would be starving of combustion air.