Heat exchanger

An apparatus comprising:

• (a) a tube sheet having apertures therethrough;
• (b) a tube bundle comprising a plurality of parallel tubes affixed to the apertures through the tube sheet, each tube affixed by at least one end to an aperture of the tube sheet, the tubes being arranged in at least a first plurality of parallel tube rows with lanes between the rows and a second plurality of parallel tube rows with lanes between the rows;
• and
• (c) a baffle cage supporting the tubes, the cage comprising a series of rod baffles, each baffle having a plurality of parallel rods passing through at least a portion of the lanes between the parallel tube rows and supporting a portion of the plurality of parallel tubes, wherein the cage also comprises at least one longitudinal support member affixed to each baffle of the series of rod baffles and extending between the baffles in a direction generally parallel to the plurality of tubes;
• and
• (d) at least one apertured baffle affixed to the at least one longitudinal support member of the baffle cage and positioned intermediate the tube sheet and the series of rod baffles so as to form a partition substantially across the tube bundle with substantially each of the tubes of the plurality of tubes passing through an aperture in the at last one apertured baffle.