From:	tlicata@babcockpower.com
Sent:	Wednesday, June 10, 2009 11:54 AM
To:	Schaffner, Karen S.
Cc:	cerickson@babcockpower.com; rlisauskas@babcockpower.com; 
jlangone@babcockpower.com

 
Karen  
 
Dr. Erickson has asked me to review the paragraph on the Delta Wing mixers.  I have added my 
comments.  Please call me if you have any questions.  
 
Thank you for your help.  
 
 
 
 
 
The Delta Wing mixers have several functions in an SCR. One application is as static 
mixers installed in the duct just prior to the SCR reactor and sometimes after the 
reactors, there mixers are used to straighten and  homogenize the flue gas 
(temperature, NOx, and dust)   The mixer plates are made of carbon steel and the cost 
for installation of the Delta Wing includes the capital cost of the equipment and the 
modeling to determine its location to maximize its mixing effect. A second application is 
for mixing and injecting ammonia.   Because each application of the Delta Wing mixer is 
different, it is difficult to cite a cost and Babcock Power typically does not have a 
breakout cost for the Delta Wing mixer.  A cost for installing the mixer and conducting 
the modeling would typically be less than $500,000, although for an SCR that was 
originally installed without a static mixer, the cost to retrofit the SCR with a mixer could 
be up to $1,000,000 to account for the capital, the modeling, and any other retrofit 
issues.
 

Tony 
Licat
a  
Vice 
Presid
ent  
Babco
ck 
Power 
Envir
onme
ntal 
Inc.  
5 
Nepo
nset 
Street  
Worc
ester, 
MA 
01606  
   
T: 
508-
854-
3853 
F: 
508-
853-
2572  
M: 
508-
615-
0317  
   
tlicata
@bab
cockp
ower.
com  
http://
www.
babco
ckpo
wer.c
om
 
 
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