Boiler stack temp

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  #1  
Old 12-03-02, 04:49 PM
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Boiler stack temp

Have a 270 BHP Kewanee boiler converted from steam to hot water generator. After apx. 45 minutes of operation, water temp had reached set point of 180 and boiler was modulating as it should.
Stack temp was around 400 at base of flue. Does this seem a normal operating temp? I would have thought it would have been higher.
 
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Old 12-03-02, 06:02 PM
TheZman
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Hello Notuboo,

The 180 F degree temperature for your water is dead on.

I just looked at one of my reference books and for an oil fired furnace, 400 degrees F sounds fine.

According to the book, anything below 380 F is too low and anything above 600 F (packaged units) or 700 F (converted units) is too high.

Regards TheZman
 
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Old 12-03-02, 06:18 PM
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notuboo:

Not really my area of expertise.
All I know is that stack temperature is an important measure of efficiency.

Here is a little bit of info:

http://www.cleaver-brooks.com/Service15.html
 
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Old 12-04-02, 10:44 AM
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Thanx for the info.
 
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Old 12-04-02, 12:21 PM
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boiler

Just takeing the flue temperature dont give you anything really. You have to use the temperature with a CO'2 indicator. This way you can analyze the combustion and see what you have on a stack loss slide rule, or how the burner is doing At the same time you want to see what the draft gauge will say also ED
 
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