deaerator
deaerator
(OP)
Hello
I was asked to prepared a report regarding comparison between two type of deaerators,the tray-type (also called the cascade-type) and spray-type deaerators.
Can anybody refer me to a guideline or book or any other reference which includes some topics regarding advantages, disadvantages and limitation of these two type dearators.
Also your previous experiences would be appreciated.
Thanks
I was asked to prepared a report regarding comparison between two type of deaerators,the tray-type (also called the cascade-type) and spray-type deaerators.
Can anybody refer me to a guideline or book or any other reference which includes some topics regarding advantages, disadvantages and limitation of these two type dearators.
Also your previous experiences would be appreciated.
Thanks





RE: deaerator
Deaerator
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: deaerator
The oxygen removal is an old system, which is still required for most of the steam generation plants. However, times have changed and this expensive method of corrosion control (and limited success) tends to be replaced by a precise /controlled oxygen injection system, in the condensate or BFW. This is particularly important for the supercritical high temp steam, where the corrosion mechanism is somehow different (read about magnetite and hematite formation and control in steam plants).
Note that one of the most important (and expensive) equipment on a steam plant is the deaerator. It is the heart of the plant. Now imagine that in the oxygen injection system developed by russians and japonese, the stainless steel dearerator is completely eliminated, with much better results in corrosion control.
Worth a read.
Cheers,
gr2vessels
RE: deaerator
Spray types work, and lots are used, but I still favor the tray type. You always have the ability to operate at minimum load without fear of getting below the threshold of what a spray type will handle.
And, yes, gr2vessels, it was a real kick in the shorts when after all those years fighting the problems associated with DA's they came out with oxygenated bfw. Go figure.
rmw
RE: deaerator
but can you direct me to a guideline or book or article?
RE: deaerator
RE: deaerator
It may happen by accident
"Tray-types" deaerators are fine....... and certainly worth the extra money over "spray-types". "Tray-types" also have better turndown (as I recall)
But, the tray-type is unsuitable in any naval application.
Stuff here: http://www.rothpump.com/Media/deaerator.pdf
http://www
-MJC
RE: deaerator
Back to the OP and serious issues, if you look at the guarantees between the two (assuming this isn't a marine application) you will see that the tray types typically carry a lower DO level. The sprays just can't get there.
I can remember a book titled; "Steam Plant Equipment". I think it goes into the two types in detail. My copy is at the office, so I can't check it for exact title and author.
rmw
RE: deaerator
your valuable ideas really help