hygroscopic properties of sodium phosphates
hygroscopic properties of sodium phosphates
(OP)
I am concerned with the operation of a bag filter designed to remove dry sodium phosphates from dryer exhaust gases.
Exit temperature is from 120 to 140oC and water dew point is 65oC. As far as I know the presence of sodium phosphates (specially NaH2PO4 and Na2HPO4) which are very hygroscopic can lead to a high water absoption on the bags cake under certain conditions.
Do you think that under the temperature and humidity above there will be intense absorption of water by the salts
How can I be sure that this will not bring problems?
Should I select a hygrophobic fabric for the bags?
Keep the filter heated during standstill operation?
Insulate the filter?
Is that all enough to avoid filter plugging?
Thanks a lot
Exit temperature is from 120 to 140oC and water dew point is 65oC. As far as I know the presence of sodium phosphates (specially NaH2PO4 and Na2HPO4) which are very hygroscopic can lead to a high water absoption on the bags cake under certain conditions.
Do you think that under the temperature and humidity above there will be intense absorption of water by the salts
How can I be sure that this will not bring problems?
Should I select a hygrophobic fabric for the bags?
Keep the filter heated during standstill operation?
Insulate the filter?
Is that all enough to avoid filter plugging?
Thanks a lot
fvincent





RE: hygroscopic properties of sodium phosphates
m777182
RE: hygroscopic properties of sodium phosphates
Can you tell me the gas temperature and the fabric material you have selected?
Is the filter a pulse jet? So you mean the compressed air is heated? How and how much?
Is there any heating device in the hopper?
Thnaks again
fvincent
RE: hygroscopic properties of sodium phosphates
m777182