4993223 Annular recuperator

New Patents transfer tubes and the inner circumferences of the holes in the baffle plates. Preferably the inner diameters of the plurality of holes in the respective baffle plates are different in different regions of the plate, and thereby the cross-sectional areas of the flow passageways of the fluid on the side of the shell between the outer circumferences of the heat transfer tubes and the inner circumferences of the holes in the baffle plates are different in different areas of the apparatus to provide a desired flow distribution of the shell side fluid.

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surface is scalloped with a succession of axially raised portions. In another embodiment, the rotary die carries a plurality of circumferential rollers. 4995454

HEAT EXCHANGER WITH CORRUGATED TUBES Donovan Thompson

4993223

ANNULAR

RECUPERATOR

Karl F Kretzinger assigned to Allied-Signal Inc An annular recuperator for use with a combustion power plant and in particular with a turbine engine. The annular recuperator is constructed from a plurality of stacked formed plates alternately sandwiching radially aligned exhaust passageways with partially radially, partially circumferentially aligned air passageways, in heat exchange relationship. The air passageways containing generally Z shaped finned passageways interconnecting axially aligned inlet and outlet manifolds within the annular core.

A heat exchanger with two concentrically disposed corrugated tubes nested one within the other for the flow of two separated fluids through the exchanger. Each tube has convolutions, and fluid openings or passageways exist for directing flow completely through each convolution of each tube for optimum heat exchange. Endplates are provided on the exchanger for assembly, and also for ease of repair and cleaning of the exchanger. The arrangement of the convolutions and openings is such that a cardioid flow pattern is obtained for the maximum efficiency of heat exchange.

4996038

HEAT RECOVERY FROM CONCENTRATED SULFURIC ACID

4995252

METHOD AND APPARATUS FOR INTERNALLY ENHANCING HEAT EXCHANGER TUBING Gerald F Robertson, Ross A Moyer, John McManus assigned to Carrier Corporation A method and machine for forming internal enhancement ribs in heat exchanger pipe or tubing comprises a mandrel which is supported within the tubing and a plurality of opposed rotary dies which have their axes perpendicular to the tube axis so that they rotate in the direction parallel to the tube axis. The rotary dies have a circumferential contact portion that has a concave arcuate profile. In one embodiment, the circumferential

Donald McAlister, Steven A Ziebold assigned to Monsanto Company A method and apparatus for the recovery of heat from a sulfuric acid process are provided. Sulfur trioxide is absorbed into hot concentrated sulfuric acid, acid having a concentration greater than 98% and less than 101% and a temperature greater than 120 degrees C., in a heat recovery tower and the heat created by the exothermic reaction is recovered in a useful form in a heat exchanger. Gas leaving the primary heat recovery absorption zone is cooled by contact with sulfuric acid in a secondary absorption and cooling zone located above the primary absorption zone in the tower.

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