requirments in boiler water treatment
requirments in boiler water treatment
(OP)
Can someone give me some general guidleins as to requirments for boiler water pre-treatment. specifically I am looking for what is the norm for oxygen scavenging in boiler water treatment. How low do you need to go? do all boilers have to worry about this? Ever considered a membrane device or other technology over chemical treatment for this?
any input is appreciated...
thanks,
Brian Miller
any input is appreciated...
thanks,
Brian Miller





RE: requirments in boiler water treatment
Also your feedewater temp. will affect this. O2 is less soluable in water at higher temps.
Typically a mechanical dearator is used along with sulphite to scavenge the excess O2. Typically 50 - 100 ppm sulphite residual is targetted.
As far as membrane usage... it depends on makeup water feedrate. RO units can be costly and require membrane replacement. You could also consider Di's or softeners in the overall comparison...
RE: requirments in boiler water treatment
Sulfite dosing depends on the boiler operator pressure. It is not used in high pressure boilers.
Oxygenated water chemistry has been imported from Europe and is finding applications in supercritical steam generators. Oxygen is actually fed into the boiler feed water. There have been a number of papers wrtitten on this topic, you might try looking at past papers from the Internation Water Conference for details.
You might try looking at www.liqui-cel.com for more info on the gas transfer membranes that can be used to degas boiler feedwater.
I think the Liqui-Cel might be an interesting replacement for forced draft degassifiers in makeup IX systems. If you could maintain low DO2 levels in the IX product you could consider the use of less exotic materials for storage tanks, etc.
RE: requirments in boiler water treatment