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Posted by Vern on April 24, 2004 at 20:07:44:
In Reply to: Chemicals into FW line posted by Chuck on April 23, 2004 at 17:09:16:
: What problems could one expect, if they used a system that injects chemicals (caustic, phosphate, sludge) into the feed water line that is supplying 3 boilers that operate at 200PSI?
: Most of the time 2 boilers are running, and the third is rotated in and out with the other two, so that at all times, at least to boilers are running. Load varies from 80 - 125Kpph.
: There is much more to this, but I am curious as to what you all think.
Sulfite should be pumped into the D/A tank. If you use phosphate it depends on what kind of phosphate as to where it should be pumped. One kind should be pumped into the D/A tank, other kinds should go into the feedwater line. If you are using a phosphonate base chemical, I prefer pumping it to the D/A tank. As far as pumping chemical into a common feedwater line, that is a matter of preference for you. I have done this with cooling towers with a common makeup line but not with boilers. Theoretically the chemical will get fed proportionally to each boiler, but in practice(with cooling towers at any rate) I have found that some units get more chem while others get less. And on other systems they all got the same.
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