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Posted by Rick on November 20, 2003 at 17:08:16:
In Reply to: DA Heater Temperature posted by James on November 20, 2003 at 06:05:13:
: Currently I am operating my DA heater, 9-10 psi @ 240 oF. In the past, I have operated my DA’s @ 220 – 222 psi and what pressure it took to maintain that temperature and a satisfactory D.O. I was wondering, is there any economical advantage to reducing our operating parameters to maintain the DA @ 220 – 222 oF vice the 240oF. Currently our DA will maintain a 1ppb D.O. at both temperatures. Turbine exhaust is our primary heating source but is also used a plant low pressure heating source. I have my own thoughts about this but would like some others.
Complete deaeration is not achieved until the water temperature reaches 220F. The main advantage of carrying 240F as an example is that you will achieve nearly a 2% savings in fuel as a result of the higher water temperature. The rule of thumb is that for ever 11F the water is raised it correlates to a 1% savings in fuel. You need also to be aware that you have sufficient suction head coming out of the heater so that your feedwater pumps do not become steambound with the hotter water.
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