Multitubular heat exchanger
AssigneeHitachi, Ltd.
InventorSyuichi Imazu
Life of this patent
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Abstract
A multitubular heat exchanger used as a feedwater heater in a power generating plant and the like includes a shell, a high temperature tube bundle and a low temperature tube bundle composed of a multiplicity of U-shaped heat transfer tubes arranged in the shell and a vent tube interposed between the two tube bundles. A laterally-closed flow passage is defined in at least one of the high temperature tube bundle and the low temperature tube bundle to induce part of a heating medium flowing between the shell and the tube bundle to flow to a position deep in the tube bundle and near the vent tube, so that a noncondensable gas stagnating zone formed in the tube bundle can be moved near to the vent tube and noncondensable gas can be removed from the shell by extraction through the vent tube.
Claims10
In a multitubular heat exchanger comprising a shell, a heating medium inlet formed in said shell, a high temperature tube bundle and a low temperature tube bundle located within said shell and formed by a large number of U-shaped heat transfer tubes for permitting a medium to be heated to flow therethrough so that heat exchange may take place between the medium to be heated and a heating medium introduced into the interior of said shell through said heating medium inlet, and a vent tube interposed between said high temperature tube bundle and said low temperature tube bundle arranged in the longitudinal direction of said shell for removing noncondensable gas therethrough from the interior of the shell, wherein the improvement comprises:
- means for defining at least one laterally-closed flow passage in at least one of said tube bundles, said flow passage inducing therethrough part of the heating medium flowing between said shell and said tube bundles to an inner deep portion of said at least one tube bundle.
Dependencies are inferred from the claim text.