Blower selection for vacuum

[nbog]

I would appreciate any input to this problem:

50 acfm of gas stream (containing solids, NOx and steam) is filtered in a baghouse with a fan downstream. Gas T is 280 C, water partial pressure is 0.3 and I am having problems with "cold spots" in the baghouse and condesate forming inside and in the fan's ducts. The baghouse is insulated, but doesn't help much.
Currently, the fan can provide 7" WC static pressure (4" WC is lost on the filters).

My plan is to replace the filters with ones which have higher pressure drop and go with 15" Hg vacuum. That means I have to replace the fan with blower. Now comes the question - which type of blower - rotary lobe or centrifugal. Assuming the particles are 99.9 collected and water is condensed downstream the baghouse, is it good idea to go with rotary blower, since I want to be able to keep the vacuum at varying gas flow rate by adjusting the blower speed? And I guess rotary blower is a better choice for my range of gas flow (30-70 acfm).

Thanks,
Nick

 

[StoneCold]

nbog
This is kind of out of my area of expertise but I would suggest contacting Roots at

http://www.rootsblower.com

and if you want a second oppinion I would contact Tuthill at

http://www.tuthill.com.

They both have a lot of blowers out there and they can probably educate you on what to buy.

Regards
StoneCold

 

[MikeHalloran]

Either way, plan on installing a noise barrier around the blower.



Mike Halloran
Pembroke Pines, FL, USA