| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed water heater which lowers the concentration of dissolved oxygen gas in a drain generated by a heat exchanger tube and makes the drain to enter the cooling part of drain. SOLUTION: This feed water heater is provided with a heat exchanger tube 26, a dilution/condensation chamber 30 and a noncondensible gas chamber 31. The dilution/condensation chamber 30 is formed along the vertical direction of a steam inlet 27 and on the lower side of a flow guide 28 surrounding the outside of the heat exchanger tube 26 as tube group, and is also formed as a box between a supporting plate 25a supporting the heat exchanger tube 26 and a supporting plate 25b provided with a steam inlet 38 adjacent thereto, and the chamber 30 makes the velocity to be comparatively high and makes a comparatively large quantity of steam (turbine extraction) to enter from both ends of the flow guide 28. On the other hand, the chamber 31 is connected with the chamber 30 and it is formed as a box of the supporting plate 25b of the chamber 30 and a supporting plate 25c provided with a steam inlet adjacent thereto and is provided with a noncondensible gas collecting port 47 surrounded by buffle plates 46a and 46b therein.
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