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Posted by Pete on January 23, 2004 at 11:52:45:
In Reply to: dew point posted by Ilan on January 22, 2004 at 13:13:51:
: You will approach the dewpoint around 120 C, but this is not your flue gas exit temperature from the economizer; it will need to be much higher. You want to make sure that the mean temperature difference between the feedwater entering the economizer and your flue gas exiting the economizer is > 120 C. This will be the approximate surface temperature on the cold end of the economizer tubes. For example if your feedwater temp. is 100 C, your flue gas leaving the economizer will need to be 200 C to give you 150 C metal temp on the cold end of your economizer. You can use this as a rough guide but you need to consult with your boiler and economizer manufacturers.