Appeal No. 95-3119 Page 15
Application No. 08/089,810
latter chamber. A gas, which could be a high temperature gas, a
combustible gas, or carbon dioxide-rich flue gas, or the like, is
introduced into the chamber 20 as needed via the inlet pipe 40.
As a result, a partial pressure of carbon dioxide is maintained
in the chamber 20 that is optimum for the calcining operation,
and any excess gas, including carbon dioxide, discharges through
the openings 18c formed in the partition 18. The air assist pipe
44 is activated to distribute the calcined limestone through the
passage 28 into the lower portion of the chamber 22, it being
understood that air can be introduced into the chamber 20 via the
inlet 34 as needed to fluidize the limestone in the latter
chamber and thus assist the movement of the limestone into the
chamber 22. The limestone from the chamber 20 integrates with
the bed material in the chamber 22 and accepts the sulfur
produced as a result of the combustion of the fossil fuel.
Alternatively, Stewart teaches that the pipes 40 or 34 could be
connected to an exhaust fan and high temperature flue gases of
increased carbon dioxide content can be gradually drawn from the
chamber 22 through the openings 18c in the partition 18 and
evacuated through the pipe 40, or through the grid 30 and pipe
34.
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Last modified: November 3, 2007