Appeal No. 1999-2643
Application 08/512,395
(specification, page 1). Claim 1 is illustrative and reads as
follows:
1. A shell and tube, gas-to-gas heat exchanger for use
in the manufacture of sulphuric acid by the contact process
involving heat transfer between dry gases, said exchanger
comprising a shell having a first shell portion defining a
first shell space, a second shell portion defining a second
shell space and a third shell portion defining a third shell
space, said second shell space being located between said
first and said third shell spaces; an annular tube bundle
comprising a plurality of tubes within said shell and
extending longitudinally through said first shell space, said
second shell space and said third shell space and defining a
core space free of said tubes within said bundle and an
annular space free of tubes between said shell and said
annular bundle; said shell having a first gas conduit means
and a second gas conduit means; each of said tubes having a
tube gas input means and a tube gas output means and baffle
means;
the improvement wherein said first shell portion further
defines a first shell aperture in communication with said
first shell space and through which a first gas stream
operably passes; said second shell portion further defines a
second shell aperture in communication with said second shell
space and through which a second gas stream operably passes;
said third shell portion further defines a third shell
aperture in communication with said third shell space and
through which a third gas stream operably passes; said baffle
means so located within said first, said second and said third
shell spaces as to operatively direct said first gas, said
second gas and said third gas streams, within said first shell
space, said second shell space and said third shell space,
respectively, in radial flow across said tube bundle; wherein
said second shell space constitutes a chamber within which
said second gas stream comprises a mixture of said first gas
stream and said third gas stream.
2
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