US 4,219,077 AGranted

Multitubular heat exchanger used in a power plant

AssigneeHitachi, Ltd.

InventorsMasahiro Furukawa, Yoshikuni Ohshima

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Abstract

A multitubular heat exchanger used in a power plant is provided with a bundle of U-shaped heat transfer tubes and a vent tube. The vent tube is located between an upper portion and a lower portion of the bundle of U-shaped heat transfer tubes. A steam flow guide plate is located above a hole of the vent tube and below the upper portion of the bundle of U-shaped heat transfer tubes. The steam flow guide plate obstruct a downward steam flow from the upper portion of the bundle toward the vent tube.

Claims5

Dependent claims

A multitubular heat exchanger used in a power plant comprising:

a shell forming therein a steam condensing compartment and a steam inlet at an upper portion of the steam condensing compartment,
a bundle of U-shaped heat transfer tubes located within the steam condensing compartment for heat-exchanging between feedwater flowing therethrough and steam introduced into the steam condensing compartment through the steam inlet,
a vent tube located between an upper portion and a lower portion of said bundle of U-shaped heat transfer tubes and arranged in the longitudinal direction of said shell for collecting noncondensable gas through a hole of said vent tube from the steam condensing compartment,
a plurality of tube support plates arranged within the steam condensing compartment with predetermined intervals in longitudinal direction of said shell for supporting said bundle of U-shaped heat transfer tubes and said vent tube, and
a steam flow guide plate located above the hole of said vent tube and below the upper portion of said bundle of U-shaped heat transfer tubes, said steam flow guide plate obstructing a downward steam flow from the upper portion of said bundle of U-shaped heat transfer tubes toward said vent tube and forming upward steam flow from the lower portion of said bundle of U-shaped heat transfer tubes toward said vent tube, wherein said steam flow guide plate comprises:
a vertical section for preventing steam flow between the upper portion and the lower portion of said bundle of U-shaped heat transfer tubes toward said vent tube, said vertical section being arranged between the upper portion and the lower portion of said bundle of U-shaped heat transfer tubes at both sides of said vent tube and supported by said tube support plates, and
a horizontal section for obstructing a downward steam flow from the upper portion of said bundle of U-shaped heat transfer tubes toward said vent tube, said horizontal section being located between said vertical sections and supported by said vertical section.

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Dependencies are inferred from the claim text.

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Abstract

A multitubular heat exchanger used in a power plant comprising:

a shell forming therein a steam condensing compartment and a steam inlet at an upper portion of the steam condensing compartment,
a bundle of U-shaped heat transfer tubes located within the steam condensing compartment for heat-exchanging between feedwater flowing therethrough and steam introduced into the steam condensing compartment through the steam inlet,
a vent tube located between an upper portion and a lower portion of said bundle of U-shaped heat transfer tubes and arranged in the longitudinal direction of said shell for collecting noncondensable gas through a hole of said vent tube from the steam condensing compartment,
a plurality of tube support plates arranged within the steam condensing compartment with predetermined intervals in longitudinal direction of said shell for supporting said bundle of U-shaped heat transfer tubes and said vent tube, and
a steam flow guide plate located above the hole of said vent tube and below the upper portion of said bundle of U-shaped heat transfer tubes, said steam flow guide plate obstructing a downward steam flow from the upper portion of said bundle of U-shaped heat transfer tubes toward said vent tube and forming upward steam flow from the lower portion of said bundle of U-shaped heat transfer tubes toward said vent tube, wherein said steam flow guide plate comprises:
a vertical section for preventing steam flow between the upper portion and the lower portion of said bundle of U-shaped heat transfer tubes toward said vent tube, said vertical section being arranged between the upper portion and the lower portion of said bundle of U-shaped heat transfer tubes at both sides of said vent tube and supported by said tube support plates, and
a horizontal section for obstructing a downward steam flow from the upper portion of said bundle of U-shaped heat transfer tubes toward said vent tube, said horizontal section being located between said vertical sections and supported by said vertical section.

4 more elements