Appeal No. 1997-1551
Application No. 08/235,597
the dry sorbent has a particle size range larger than approximately 1.0 microns2,
the amount of dry sorbent is sufficient to react with and remove substantially all of the
SO3 in the flue gas, and
the substantially SO3-free flue gas contains both reacted and unreacted sorbent;
conveying the substantially SO3-free flue gas, reacted sorbent, and unreacted sorbent to a wet
scrubber means;
wetting and removing the reacted sorbent and unreacted sorbent from the substantially
SO3-free flue gas with the wet scrubber means,
making a wet reagent4 with the unreacted dry sorbent;
reacting the wet reagent with the SO2 in the wet scrubber means to remove SO2 from
the substantially SO3-free flue gas.
Prior art cited by the examiner as evidence of obviousness
The examiner relies upon Kohl as the primary reference.
Kohl teaches providing flue gas containing SO3 and SO3 produced by burning fossil fuel (pp.
302 and 303). The SO3 can be highly corrosive, especially when the SO3 reacts with
water to form sulfuric acid (paragraph bridging pp. 302 and 303).
Kohl describes sending the flue gas to particulate collection means for collecting and removing
4 As noted below, claim 1 as presently drafted fails to provide antecedent basis for Athe wet reagent@.
4
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