Appeal No. 1997-1551
Application No. 08/235,597
particles from the flue gas to produce a partially cleaned flue gas (p. 309, Fig. 7-2, Ash
Collector)
Kohl discloses conveying the partially cleaned flue gas to a wet scrubber means;
making a wet reagent with materials such as lime (CaO), limestone (CaCO3), and
magnesium oxide (MgO) (p. 308, Table 7-7). Compare, present claim 3, and
p. 7, lines 20-24, of the present specification.
reacting the wet reagent with the SO2 in the wet scrubber means to remove SO2 from
the flue gas (p. 306, Figure 7-1; and pp. 307-320).
There are differences between the teachings of Kohl and the claimed invention.
Kohl does not disclose removing substantially all the SO3 from the flue gas.
Kohl discusses SO3 formation at pp. 302 and 303, but its formation is attributed to
process condition variables such as air/fuel ratios, fuel composition,
temperature, etc.
Kohl addresses SO2 removal elsewhere and the examiner points to no teaching in Kohl
on the actual removal of SO3 in particular from a flue gas.
Kohl does not describe injecting dry sorbent particles into the flue gas after particulate collection
and before wet scrubbing, so that some of the dry sorbent particles react with and
remove substantially all the SO3 in the flue gas, and so that the unreacted dry sorbent
particles form a wet reagent to remove SO2 from the substantially SO3-free flue gas
during wet scrubbing.
Kohl describes a Adry plus wet@ process at p. 307, para. 4, but that process involves
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