JPH0226527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in moisture separation devices for wet steam, such as moisture separation devices for nuclear power plants and various other reheaters and separators.

Conventional moisture separators for nuclear power plants have a large volume and take up a lot of space on the turbine room floor, and the piping is also high above the floor, which obstructs crane operation. It had drawbacks such as being very powerful and inconvenient in terms of architecture.

The present invention was proposed for the purpose of eliminating the drawbacks of the conventional moisture separator for wet steam and providing a moisture separator with excellent performance. a drain separation screen held along and at a distance from the inner circumferential wall of the container body; a screen support/drain catcher that connects the screen to the inner circumferential wall of the container body; and an upper part of the circumferential wall of the container body. A nozzle for introducing wet steam installed in a proper place and opening in the plane of the screen and in the tangential direction thereof, a cylindrical drain collection net installed inside the screen, and a concentric circle inside the drain collection net. A moist steam bath characterized by comprising a plurality of rows of heating tubes arranged in a shape, a drain outlet provided at the bottom of the container body, and a reheat steam outlet provided at the top of the container body. This relates to a moisture separator.

Hereinafter, according to the embodiment shown in FIGS. 1 and 2,
The present invention will be specifically explained.

In these figures, 1 is a cylindrical vertical container body that forms the outer shell of the container, and 2 is a cylindrical vertical container body that opens at a suitable position on the upper part of the peripheral wall of the container body 1 in a tangential direction to the inner peripheral wall surface of the container body. The wet steam introduced into the container body 1 from the nozzle stub 2 is adapted to cause a swirling motion along the inner circumferential surface of the container body 1. Reference numeral 20 denotes a drain separation screen installed in the vicinity of the peripheral wall of the container body 1 as shown in the figure. It is supported concentrically within the container body 1 by screen supports/drain catchers 22 provided at intervals, and as described above, the nozzle 2
Moisture in the wet steam that is introduced into the container body 1 through the swirling motion is transferred from the slit portion of the screen 20 to the space between the screen 20 and the peripheral wall of the container body 1 due to centrifugal force based on the swirling motion. The water is pushed out to the bottom, is prevented from rotating by the screen support/drain catcher 22, flows downward, and is discharged from the drain outlet 15 at the bottom of the container body. Reference numeral 6 indicates an upper tube plate attached to the top of the container body 1, and 8 indicates a first stage heater supported by a heater support 23 projecting from the lower circumferential wall of the container body 1 as shown in FIG. A donut-shaped tube plate is attached to the upper surface of the drain reservoir 10, and between the tube plate 8 and the upper tube plate 6, a group of first stage heating tubes 17 are arranged radially in the circumferential direction as shown in FIG. Arranged. 9 is a second stage heater drain reservoir supported by the donut-shaped tube plate 8 via a sealing bellows type expansion joint 24;
As shown in the figure, a second-stage heater lower tube plate 7 is installed, and between the lower tube plate 7 and the upper tube plate 6, a group of second-stage heating tubes 16 is connected to the first-stage heating tube 1.
Like the 7th group, they are arranged radially. Reference numeral 4 denotes a second stage heating steam chamber installed on the upper surface of the upper tube plate 6 as shown in FIG. A steam inlet 11 is provided. 5 is the second stage heating steam chamber 4
The first stage heating steam chamber is mounted on the upper surface of the upper tube plate 6 so as to surround the first stage heating steam chamber, and is provided with a first stage heating steam inlet 12. Reference numeral 13 denotes a second-stage heated steam drain discharge pipe whose one end opens at the bottom of the second-stage heater drain reservoir 9 and whose other end extends outside the container body 1;
The middle part is formed into a loop shape to absorb differences in expansion and contraction. Reference numeral 14 denotes a first-stage heated steam drain discharge pipe whose one end opens at the bottom of the first-stage heater drain reservoir 10 and whose other end extends outside the container body 1, and the middle part thereof is formed in the shape of an arrowhead loop. There is. 15 is a drain outlet provided at the bottom of the container body 1; 18 is a tube support plate that supports the heating tubes 16 and 17 at appropriate spans as shown in FIG. 1; and 19 is a drain outlet provided as shown in FIG. The provided heating tube protection plate 19 has the role of protecting the heating tube near the entrance of the nozzle stand 2. 21 is a drain collection net attached to the outer periphery of the first stage heating tube;
The upper and lower ends are attached to the upper tube plate 6 and the donut-shaped tube plate 8, and the middle part is supported by the tube support plate 18. It has the role of evenly distributing the steam flow from 2 to the lower part. 25 is a rotating separator attached to the screen 20 as shown in FIG. Helpful.

One embodiment of the apparatus for separating moisture in wet steam according to the present invention is constructed as described above, and when the apparatus starts operating, the wet steam from the nozzle holder 2 is separated from the container main body 1.
The moisture in the wet steam flows through the slit portion of the drain separation screen 20 due to the centrifugal force caused by the swirling flow, and the moisture in the wet steam flows into the space between the screen 20 and the container body 1. Screen support and drain catcher 22
The swirling flow is regulated by the water, and the water flows down to the bottom and is discharged to the outside from the drain outlet 15. After the moisture has been separated from the steam as described above, the moisture is further collected by the drain collection net 21.
Heating steam passes through the outer periphery of the group of first-stage heating steam inlets 17 to which heating steam is supplied from the first-stage heating steam inlet 12 and is heated. On the other hand, the moisture collected by the drain collection net 21 descends and is discharged from the drain outlet 15 to the outside. In addition, the steam in the first stage heating tube 17 group exchanges heat with the steam passing through the outer periphery, becomes a drain at the bottom of the tube, and the first stage heater drain reservoir 10
It is then discharged to the outside from the drain outlet 14.
The steam that has passed through the outer periphery of the 17 group of first-stage heating tubes is heated in the same way as it passes through the outer periphery of the 16 group of second-stage heating tubes located further inside, and after the moisture is separated, it passes through the central space and is re-circulated. The hot steam is taken out from the outlet 3. Further, the heated steam in the group of second-stage heating tubes 16 becomes drain at the bottom of the tubes, passes through the second-stage heater drain reservoir 9, and is discharged to the outside from the drain discharge pipe 13.

Since the moisture separator in wet steam of the present invention has the above-described configuration and operation, according to the present invention, the wet steam is separated from the nozzle holder 2 to the container body 1.
The centrifugal force generated by the swirling motion is used to separate the moisture in the wet steam.Heating tubes 16 and 17 are arranged radially, and the wet steam is introduced into the interior while rotating. Since the steam is made to flow toward the center and extracted from the center, heat exchange between the heated steam and wet steam in the heating tube groups 16 and 17 is performed rationally, improving moisture separation performance. In addition, the structure is simple, the entire device can be made smaller, and a large amount of installation space is not required, which is a practical effect.

[Brief explanation of drawings]

The attached drawings are schematic illustrations of one embodiment of the present invention.
FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 1: Container body, 2: Nozzle stand for introducing wet steam, 3:
Reheating steam outlet, 4: Second stage heating steam chamber, 5: First
Stage heating steam chamber, 6: Upper tube sheet, 7: Second stage heater lower tube sheet, 8: First stage heater lower donut-shaped tube sheet, 9: Second stage heater drain reservoir, 10: First stage Heater drain reservoir, 11: Second stage heating steam inlet, 1
2: 1st stage heated steam inlet, 13: 2nd stage heated steam drain discharge pipe, 14: 1st stage heated steam drain discharge pipe, 15: Drain discharge port, 16: 2nd stage heated tube, 17: 1st stage Heating tube, 18: Heating tube support plate, 19: Heating tube protection plate, 2
0: Screen, 21: Drain collection net, 2
2: Screen support and drain catcher, 2
3: Heater support, 24: Bellows type expansion joint, 25: Swivel separator.

Claims (1)

[Claims] 1. A cylindrical vertical container body, a drain separation screen held along the inner circumferential wall of the container body at a distance from the inner circumferential wall, and a screen support that connects the inner circumferential wall of the container body and the screen. a drain catcher, a nozzle for introducing wet steam that is attached to a suitable upper part of the peripheral wall of the container body and opens in the plane of the screen and in the tangential direction thereof, and an inner cylindrical drain collection net that is installed inside the screen; The drain collection net includes a plurality of rows of heating tubes arranged concentrically inside the drain collection net, a drain outlet provided at the bottom of the container body, and a reheat steam outlet provided at the top of the container body. A moisture separator for wet steam, characterized by: