Appeal No. 97-2914
Application No. 08/448,060
a duct supplying a flue gas containing SO3 and SO2;
particulate collection means for removing particulates from the flue gas to produce
partially cleaned flue gas;
flue means for conveying the partially cleaned flue gas from the particulate collection
means;
means for injecting an amount of dry sorbent having a particle size range larger than
approximately 1.0 B 2.0 microns into the flue gas conveyed within the flue means that is
sufficient to react with and remove substantially all of the SO3 from the partially cleaned
flue gas to produce a substantially SO3-free flue gas containing reacted dry sorbent and
unreacted dry sorbent; and
wet scrubber means for removing SO2 from the substantially SO3-free flue gas, the wet
scrubber means wetting both the reacted and unreacted dry sorbent in the substantially
SO3-free flue gas, thereby making the unreacted dry sorbent available as a wet reagent
for SO2 removal, the wet reagent reacting with the SO2 in the wet scrubber means to
remove SO2 from the substantially SO3-free flue gas.
The references relied upon the examiner are:
Cyran et al. (Cyran) 4,555,391 November 26, 1985
British Patent (Steag) 1,589,999 May 28, 1981
Kohl et al. (Kohl), Gas Purification, 4th ed., Gulf Publishing Company (1985), pp. 302, 303, and 306-
320.
Rejections
Claims 9-14 stand rejected under 35 U.S.C. ' 103. The examiner relies upon Kohl, Cyran, Steag, and
appellants= admission as evidence of obviousness. We reverse the rejection and institute new
grounds of rejection under 37 C.F.R. ' 1.196(b).
The claims at issue
Claim 9, representative of the claims on appeal, is directed to a system for removing SO3 and SO2 from
a flue gas produced by burning fossil fuel comprising, as summarized below:
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007