Appeal No. 97-2914
Application No. 08/448,060
Steag does not teach the actual injection of dry sorbent particles into the flue
gas stream after the particulate collection step.
Instead, the reference teaches a multiple stage filtration in which the dust
content is reduced from 10-15 g/m3 to 600 mg/ m3 in the first
filtration, to 100-200 mg/ m3 after the dry gas cleaning stage,
and to 10 mg/ m3 in the final filtration (p. 2, lines 55-83 and
105-115).4
The reference does not explicitly discuss the dry gas cleaning process
itself but only indicates that such processes are Aknown per se@
at p. 2, line 15.
Steag does not teach wet scrubbing in particular but only acknowledges the
existence of such processes in the prior art at p. 1, lines 60-65.
4 The A10 to 15 mg/ m3@ reported at p. 2, line 57, of Steag is an obvious typographical error.
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