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US 4,461,346 AGranted
Feedwater heater
AssigneeHitachi, Ltd.
InventorsYoshiyuki Hoshino, Shyuichi Imazu, Masahiko Miyai, Yoshikuni Oshima, Masakiyo Izumiya
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AssigneeHitachi, Ltd.
InventorsYoshiyuki Hoshino, Shyuichi Imazu, Masahiko Miyai, Yoshikuni Oshima, Masakiyo Izumiya
Estimating the term…
A horizontal feedwater heater for use in heat power stations, of the type having a shell, a plurality of U-bent heat transfer tubes extended in the longitudinal direction of the shell and a vent tube extended in the longitudinal direction of the shell substantially at the center of the latter and adapted for extracting and discharging non-condensed gas. The feedwater heater has a baffle disposed at each side of the vent tube and having a horizontal plate portion extended horizontally from the vent tube and an inclined plate portion inclined downwardly from the end of the horizontal plate portion at an obtuse angle to the latter. The length of projection of the baffle from the vent tube is varied along the length of the shell in accordance with the ratio of amount of heat exchanged between the steam and feedwater in each axial section of the tube nest connected to the water inlet to the amount of heat exchanged between these fluids in the corresponding tube nest section of the feedwater outlet side, thereby to permit an efficient extraction of the non-condensed gas. The structural members connectable with the heating steam is made from a low alloy steel containing more than 1% of Cr to exhibit a high corrosion resistance.
In a feedwater heater having a shell defining a feedwater heating chamber and provided with a piping for introducing at least one heating fluid into said feedwater heating chamber, a plurality of U-bent heat transfer tubes extended in the longitudinal direction of said shell in such a manner as to form an upper tube nest and a lower tube nest, a water chamber section formed at one end of said shell and having a water inlet chamber to which one of said tube nest is connected and a water outlet chamber to which the other of said tube nests is connected, a vent tube disposed between said tube nests and adapted for extracting and discharging non-condensed gas, and a plurality of tube supporting plates arranged to support said heat transfer tubes and said vent tube at a plurality of points spaced in the longitudinal direction of said shell at a predetermined pitch,
In a feedwater heater having a shell defining a feedwater heating chamber and provided with a piping for introducing at least one heating fluid into said feedwater heating chamber, a plurality of U-bent heat transfer tubes extended in the longitudinal direction of said shell in such a manner as to form an upper tube nest and a lower tube nest, a water chamber section formed at one end of said shell and having a water inlet chamber to which one of said tube nests is connected and a water outlet chamber to which the other of said tube nests is connected, a vent tube disposed between said tube nests and adapted for extracting and discharging non-condensed gas, and a plurality of tube supporting plates arranged to support said heat transfer tubes and said vent tube at a plurality of points spaced in the longitudinal direction of said shell at a predetermined pitch, in such a manner as to divide said tube nests into a plurality of tube nest sections, each including an upper tube nest section and a lower tube nest section,
Dependencies are inferred from the claim text.