JPH0732301U - Steam generator - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent pulsation of the fluid flowing in the heat transfer tube. [Structure] In a water supply hole 10 of an inlet tube plate 7, a resistance blade 12 formed in a truncated cone shape and divided into a plurality of pieces in the circumferential direction.
Is arranged so that the small diameter portion faces the upstream side with respect to the flow direction of the water W, and the large diameter portion of the resistance blade 12 is fixed to the inner circumference of the water supply hole 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steam generator in which a resistance blade, which is formed in a truncated cone shape and is divided into a plurality in the circumferential direction, is arranged in a flow path so that a small diameter portion faces the upstream side in the fluid flow direction. .

[0002]

[Prior art]

 In a steam generator of a fast breeder reactor, water is heated by molten sodium to generate steam. As such a steam generator, for example, there is one shown in FIG.

In FIG. 3, 1 is a body portion, 2 is a sodium inlet pipe for supplying molten sodium 3 into the body portion 1 from above the body portion 1, and 4 is molten sodium 3 descending in the body portion 1. A sodium outlet pipe for discharging from the bottom of the body to the outside, 5 is connected to the lower side of the body 1 and a water supply inlet nozzle protruding outward in the horizontal direction, and 6 is connected to the upper side of the body 1. And a steam outlet nozzle projecting outward in the horizontal direction, 7 is an inlet tube plate attached to a side of the water supply inlet nozzle 5 close to the body 1, and 8 is close to the body 1 of the steam outlet nozzle 6. An outlet tube plate 9 attached to the side is a plurality of heat transfer tubes which are housed in the body 1 and through which water W and steam V flow.

A midway portion of the heat transfer tube 9 in the longitudinal direction is spirally wound, a lower portion extends vertically downward and is horizontally bent at the lower end toward the inner periphery of the body 1, and an upper portion is vertical. It extends upward and is bent horizontally at the upper end toward the inner peripheral side of the body 1.

As shown in FIG. 4, the inlet tube sheet 7 is provided with a plurality of water supply holes 10 penetrating the inlet tube sheet 7 in the horizontal direction, and the outlet tube sheet 8 is provided with a plurality of water holes 10 as shown in FIG. A plurality of steam holes 11 are provided to horizontally extend through the outlet tube sheet 8.

As shown in FIG. 4, the lower end of the heat transfer tube 9 is connected to the water supply hole 10 of the inlet tube plate 7, and the water W supplied to the water supply inlet nozzle 5 shown in FIG. The heat transfer tube 10 is introduced into the heat transfer tube 9.

As shown in FIG. 5, the upper end of the heat transfer tube 9 is connected to the steam hole 11 of the outlet tube plate 8, and the steam V generated in the heat transfer tube 9 is drawn from the steam hole 11 of the outlet tube sheet 8 to It can be fed to the steam outlet nozzle 6 of No. 3.

During operation, the hot molten sodium 3 is introduced from the sodium inlet pipe 2 into the body 1 of the steam generator, and while descending, heats the water W and the steam V flowing in the heat transfer pipe 9 to remove sodium. It is delivered from the outlet pipe 4 to the outside.

The water W sent to the water supply inlet nozzle 5 is introduced into the heat transfer tube 9 from the water supply hole 10 of the inlet tube plate 7, and is heated by the molten sodium 3 while passing through the heat transfer tube 9 to become steam V. And passes through the steam hole 11 of the outlet tube sheet 8 and is delivered to the steam outlet nozzle 6.

[0010]

[Problems to be solved by the device]

 In the above steam generator, the operating conditions such as the pressure and temperature of the molten sodium 3 and the pressure and temperature of the water W and the steam V are not always constant and may change, and the molten sodium 3 that descends inside the body 1 The flow rate is not necessarily uniform at every position in the body 1, and the flow rate becomes uneven depending on the location. Further, water W and steam V flowing in each heat transfer tube 9 are also located in the heat transfer tube 9. May result in non-uniform flow rates. Therefore, the flow rates of the water W and the steam V flowing in the heat transfer tube 9 change with time, and the water W and the steam V may pulsate.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent pulsation of water or steam flowing in the heat transfer tube.

[0012]

Means for Solving the Problems The present invention is directed to an inlet tube plate provided at a heated fluid inlet portion of a body portion and having a heated fluid introduction hole formed therein, and a heated fluid outlet portion of the body portion. An outlet tube plate provided with a heated fluid delivery hole is housed in the body along with the outlet tube sheet, and one end is connected to the heated fluid introduction hole and the other end is connected to the heated fluid delivery hole. In a steam generator provided with a heat transfer tube, a frusto-conical shape is formed in a circumferential direction at a predetermined position in the flow path from the heated fluid introduction hole to the heated fluid delivery hole via the heat transfer tube. The divided resistance vanes are arranged so that the small diameter portion faces upstream with respect to the flow direction of the fluid to be heated and the large diameter portion is fixed to the inner circumference of the flow passage.

[0013]

[Action]

 When the flow rate of the fluid increases, the resistance vanes are narrowed and the cross section of the flow path is reduced, so that the flow resistance increases. Therefore, the increasing flow rate of the fluid is suppressed, and the pulsation of the fluid flowing in the heat transfer tube is prevented.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention. In this embodiment, a resistance blade 12 made of low alloy steel or stainless steel is provided in a water supply hole 10 of an inlet tube sheet 7.

The resistance blade 12 is formed into a truncated cone shape having a taper angle of about 10 to 15 ° and is divided into a plurality of portions in the circumferential direction, and the large diameter portion is welded to the inner circumference of the water supply hole 10. The small diameter portion is attached and faces the upstream side with respect to the direction in which the water W flows.

When an attempt is made to increase the flow rate of the water W flowing from the water supply inlet nozzle 5 shown in FIG. 3 into the water supply hole 10 of the inlet tube sheet 7, the resistance vane 12 is deformed toward the center of the water supply hole 10 due to the increase in water pressure. However, since the small diameter portion of the resistance blade 12 is narrowed, the flow passage cross section of the water supply hole 10 becomes small and the flow resistance increases. Therefore, the increase in the flow rate of the water W flowing through the water supply hole 10 is suppressed, and the pulsation of the water W or the steam V flowing inside the heat transfer tube 9 is prevented.

When the flow rate of the water W is reduced while the resistance blade 12 is squeezed, the resistance blade 12 is deformed toward the outer periphery of the water supply hole 10 due to the decrease in water pressure and returns to the original state. The flow path cross section of 10 is enlarged and the flow resistance is reduced. Therefore, the decrease in the flow rate of the water W flowing through the water supply hole 10 is suppressed, and the pulsation of the water W or the steam V flowing inside the heat transfer tube 9 is prevented.

In the embodiment of the present invention, the case where the resistance blade is provided in the water supply hole of the inlet tube sheet has been described, but it may be provided in the steam hole of the outlet tube sheet or in the heat transfer tube. It goes without saying that various changes can be made without departing from the scope of the present invention.

[0020]

[Effect of device]

 According to the steam generator of the present invention, the excellent effect that the pulsation of the fluid flowing in the heat transfer tube can be prevented can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a portion of an inlet tube plate in an embodiment of the steam generator of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a general vertical sectional view of a steam generator.

FIG. 4 is a vertical sectional view of a portion of an inlet tube sheet of the steam generator of FIG.

5 is a vertical sectional view of a portion of an outlet tube sheet of the steam generator of FIG.

[Explanation of symbols]

 1 Body 7 Inlet Tube Plate 8 Outlet Tube Plate 9 Heat Transfer Tube 10 Water Supply Hole (Heating Fluid Introduction Hole) 11 Steam Hole (Heating Fluid Delivery Hole) 12 Resistance Blade W Water (Heating Fluid) V Steam (Heating Fluid) )

Claims (1)

[Scope of utility model registration request] 1. An inlet tube plate provided at a heated fluid inlet of a body and having a heated fluid introduction hole formed therein, and a heated fluid delivery hole provided at a heated fluid outlet of the body. In a steam generator having a heat transfer tube, which is housed in the body part in the same manner as the punched outlet tube plate and has one end connected to the heated fluid introduction hole and the other end connected to the heated fluid delivery hole A small-diameter portion of a resistance blade formed in a frustoconical shape and divided into a plurality of portions in the circumferential direction at a required position of a flow path from the heated-fluid introducing hole to the heated-fluid delivery hole via a heat transfer tube. Is arranged so that the large diameter portion is fixed to the inner circumference of the flow path and is directed upstream with respect to the flow direction of the fluid to be heated.