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Posted by Boiler Guy on September 20, 2004 at 07:12:41:
In Reply to: Economizer posted by Prabakaran on September 16, 2004 at 09:34:16:
Without an knowledge of gas and water flow rates and fuels fired it is hard to start. Please also advise the firing rate of the boiler at the time you made this observation. Please also advise what you describe as a 29% recovery, 29% of what ?
: We have an economizer fitted on our boiler. Now, we notice that the flue gas directly into the economizer is at 230 degrees celcius. Flue gas temperature upon leaving the economizer is at 160 degrees celcius.
: The incoming water to the economizer is at 130 degrees celcius and exits economizer at 150 degrees celcius.
: My question is why is the water absorbing only a mere 29% of heat released from the flue gas?
: Why isn't the economizer heat exchanging more, taking into account of external fouling of economizer tubes and internal tube scale, I believe at least 70% of heat must be exchanged.
: Is this so, or is there something amiss.
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