KR102277764B1 - Steam generator and method of securing tubes within a steam generator against vibration - Google Patents

Abstract

The steam generator 2 comprises a tube bundle 200 , 300 , 500 having a plurality of tubes arranged in rows and columns. A first row of tubes 210 , 310 , 510 includes first tubes 212 , 312 having a curved centerline 214 disposed within a first plane 216 , 316 , 516 . A second row of tubes 230 , 330 , 530 includes a second tube 232 , 332 having a curved centerline 234 disposed within a second plane 236 , 336 , 536 , the second plane comprising Parallel to the first plane and spaced apart from the first plane by a distance 206 , 306 . The steam generator further includes a first plurality of solid anti-vibration bars 220 , 320 , 520 disposed between the first row of tubes and the second row of tubes, wherein the tubes each have an outer tube diameter 204 , 304 . ), and each of the first plurality of anti-vibration bars has a thickness 222 , 322 , 522 generally transverse to the first and second planes, the thicknesses being between the first and second planes. It is greater than the distance minus the outer diameter of the tube.

Description

STEAM GENERATOR AND METHOD OF SECURING TUBES WITHIN A STEAM GENERATOR AGAINST VIBRATION

The disclosed concept relates generally to steam generators, and in particular to steam generators comprising an anti-vibration bar. The disclosed concept also relates to a method of securing a tube in a steam generator against vibration using a plurality of anti-vibration bars.

A heat exchanger having a tube bundle is commonly employed in pressurized water nuclear reactor systems. Steam generators generally consist of a vertically oriented shell, a tube bundle formed of a tube each containing two vertical components meeting at a bend portion, and a tube sheet for supporting the tube at the end opposite the bend portion. tube sheet, a split plate cooperating with the tube sheet, and a primary fluid inlet header at one end of the tube bundle and a primary fluid outlet header at the other end of the tube bundle. forming a hemispherical channel head. A primary fluid inlet nozzle is in fluid communication with the primary fluid inlet header, and a primary fluid outlet nozzle is in fluid communication with the primary fluid outlet header. The steam generator secondary side is a wrapper disposed between the tube bundle and the shell, the wrapper defining an annular chamber consisting of an outer shell and an inner wrapper, and a feedwater ring disposed over the bends of the tube bundle. ) is included.

A primary fluid heated by circulation through the reactor core enters the steam generator through a primary fluid inlet nozzle. From the primary fluid inlet nozzle, primary fluid is directed through the primary fluid inlet header, through the interior of the tube bundle, out of the primary fluid outlet header, through the primary fluid outlet nozzle, and to the reactor coolant pump for recirculation. Simultaneously, feed water is introduced to the steam generator secondary side through a feed water nozzle connected to a feed ring inside the steam generator. Upon entering the steam generator, the feedwater is mixed with water returning from a moisture separator located above the tube bundle, referred to as the recycle stream. This mixture, called downcomer flow, is directed down the annular chamber between the shell and wrapper, where the tube sheet near the bottom of the annular chamber causes the water to change direction, into heat exchange relationship with the outside of the tube and Until it passes up through the inside of the rapper. While the water is circulating in heat exchange relationship with the tube bundle, heat is transferred from the primary fluid in the tube to the water around the tube, causing some of the water outside the tube to be converted to steam. The steam-water mixture then rises and is guided through a number of moisture separators that separate any entrained water from the steam, and then steam gas exits the steam generator and is typically circulated through a turbine generator, as is well known in the art. Generate electricity in a known way.

The portion of the steam generator that contains most of the bends of the tube and is below the channel head is typically referred to as the evaporator section. The portion of the steam generator above the tube containing the moisture separator is typically referred to as the steam drum. The feed water enters the steam generator through an inlet nozzle disposed in the upper part of the cylindrical shell. The feedwater is distributed, mixed with the water removed by the moisture separator, and then flows down the annular channel surrounding the tube bundle.

The tube, at its open end, is supported by conventional means whereby the end of the tube is welded to a tube sheet disposed generally transverse to the longitudinal axis of the steam generator. A series of tube support plates or grids arranged in axially spaced relation to one another are provided along the straight portion of the tube to support the straight section of the tubing. With respect to tube bundles, various steam generators use different tube configurations, for example where the bends are curved or U-shaped, or where the vertical components of the tube are each bent at acute angles to form bends of a relatively horizontal shape.

A plurality of anti-vibration bars, typically disposed between each column of tubes, are positioned within the bends of the tubes. The anti-vibration bar provides support and does not substantially impede the flow of moisture-laden vapor. Anti-vibration bars are intended to prevent excessive vibration of the individual tubes of the entire tube bundle, which can potentially damage the tubes. It is well known that the bends of tube bundles are more severely affected by vibrations and, because of their bending configuration, are more difficult to properly support to counteract vibrations.

The typical motion of a tube experiencing normal vibration is transverse to the plane of the U-bend, and therefore such vibration is referred to as out-of-plane vibration. Under unusual conditions, the tube may also experience in-plane vibrations. In such a situation, adjacent tubes in a given row may come into contact with each other, causing serious damage to the tubes. The manufacture and assembly of tube bundles is a significant obstacle to a mechanical solution to this problem. For this reason, current anti-vibration bar assembly designs do not significantly limit the in-plane motion of the tube.

These needs and others are met by the disclosed concept in which a solid anti-vibration bar with increased thickness is structured to be positioned within a tube bundle.

According to one aspect of the disclosed concept, a steam generator is provided. The steam generator has a primary side for circulating a heated fluid, and a secondary side for circulating a fluid to be heated by the heated fluid circulating on the primary side. The steam generator includes a channel head for receiving the heated fluid; a tube sheet separating the channel head from the secondary side; a tube bundle having a plurality of tubes arranged in rows and columns, the tube bundle extending from a channel head, through a tube sheet, and through at least a portion of a secondary side; and a first plurality of solid anti-vibration bars. The plurality of tubes includes a first row of tubes, the first column of tubes including a first tube having a curved centerline disposed in a first plane. The plurality of tubes further comprises a second row of tubes, each of the first plurality of anti-vibration bars disposed between the first row of tubes and the second row of tubes. The second row of tubes includes second tubes having a curved centerline disposed in a second plane, the second plane being parallel to the first plane and spaced a distance from the first plane. Each tube has a tube outer diameter. Each of the first plurality of anti-vibration bars has a thickness generally transverse to the first and second planes. A thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first and second planes minus the outer tube diameter. Each of the first plurality of anti-vibration bars is disposed substantially on the longitudinal axis and has a curved centerline intersecting the longitudinal axis.

According to another aspect of the disclosed concept, there is provided a method for securing tubes in a steam generator against vibration, wherein the tubes are disposed within a tube bundle and arranged in rows and columns, with lanes between the rows. A method is provided for securing a tube therein. The method includes providing a first row of tubes comprising a first tube having a curved centerline disposed in a first plane; providing a first plurality of solid anti-vibration bars; and providing a second row of tubes, each of the first plurality of anti-vibration bars being disposed between the first row of tubes and a second row of tubes, the second row of tubes being curved disposed in a second plane. providing a second row of tubes comprising a second tube having a molded centerline, the second plane being parallel to the first plane and spaced a distance from the first plane. Each tube has a tube outer diameter. Each of the first plurality of anti-vibration bars has a thickness generally transverse to the first and second planes. A thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first and second planes minus the outer tube diameter. Each of the first plurality of anti-vibration bars is disposed substantially on the longitudinal axis and has a curved centerline intersecting the longitudinal axis.

A thorough understanding of the disclosed concepts may be obtained from the following description of preferred embodiments when read in conjunction with the accompanying drawings.

1 is a partially cut-away perspective view of a vertical tube and shell steam generator;
2 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator with anti-vibration bars;
3 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator having an anti-vibration bar according to an embodiment of the disclosed concept;
Fig. 4a is a schematic front view of a plurality of tubes of the tube bundle of Fig. 3;
Fig. 4b is a schematic side view of the tube of Fig. 4a;
Fig. 4c is a schematic isometric view of the tube of Fig. 4a;
5 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator with an anti-vibration bar according to an alternative embodiment of the disclosed concept;
6A is a schematic cross-sectional view of a portion of a tube bundle of a steam generator with an anti-vibration bar according to a further embodiment of the disclosed concept;
6B is a schematic cross-sectional view of the tube bundle of FIG. 6A with the anti-vibration bar displaced, and
7 is a schematic cross-sectional view of a portion of a tube bundle of a steam generator with an anti-vibration bar according to a further embodiment of the disclosed concept;

Referring now to the drawings, FIG. 1 shows a plurality of heat exchanger tubes 3 forming a tube bundle 4 to provide a heating surface necessary to transfer heat from the primary fluid to vaporize or boil the secondary fluid. A steam generator 2 using The steam generator 2 comprises a vertically oriented tubular shell portion 6 and an upper enclosure or dish-shaped head 8 surrounding the upper end, and a generally hemispherical-shaped channel head 10 surrounding the lower end. including a vessel having The lower shell portion 6 is smaller in diameter than the upper shell portion 12 , and a frustoconical-shaped transition 14 connects the upper and lower portions. A tube sheet 16 is attached to the channel head 10 and has a plurality of apertures 18 disposed therein for receiving the end of the tube 3 . A dividing plate 22 is centrally disposed within the channel head 10 to divide the channel head 10 into two compartments 24 , 26 which divide the tube bundle 4 . It serves as a header for Compartment 26 is a primary fluid inlet compartment and has a primary fluid inlet nozzle 27 in fluid communication with the inlet compartment. Compartment 24 is a primary fluid outlet compartment and has a primary fluid outlet nozzle 28 in fluid communication with the outlet compartment. Thus, the primary fluid entering the fluid compartment 26 , ie the reactor coolant, is allowed to flow through the tube bundle 4 and out through the outlet nozzle 28 .

The tube bundle 4 is surrounded by a wrapper 30 which forms an annular passage 32 between the wrapper 30 and the shell and transition portions 6 and 14, respectively. The top of the wrapper 30 is covered by a lower deck plate 34 including a plurality of openings 36 in fluid communication with a plurality of riser tubes 38 . A swirl vane 40 is disposed within the riser tube 38 to cause the vapor flowing through the riser tube 38 to swirl, as it flows through this primary centrifuge, of the moisture contained in the vapor. Some are removed by centrifugal force. The water separated from the vapor in this primary separator is returned to the upper surface of the lower deck plate 34 . After flowing through the primary centrifugal separator, the steam passes through a secondary separator 42 before reaching a steam outlet nozzle 44 centrally disposed within the dish head 8 . The water separated from the steam in the secondary separator 42 is returned and mixed with the water returned from the primary separator on the lower deck plate 34 .

The feed inlet structure of this steam generator 2 includes a feed inlet nozzle 46 having a generally horizontal portion called a feedring 48 , and a discharge nozzle 50 raised above the feedring 48 . do. The feed water supplied through the feed water inlet nozzle 46 passes through the feed water ring 48 , exits through the discharge nozzle 50 , is mixed with the water that has been separated from the steam and is recycled. The mixture then flows down over the lower deck plate (34) and into the annular downcomer passageway (32). Water then enters the tube bundle 4 in the lower part of the wrapper 30 and flows between the tubes 3 and over the tube bundle 4 where it is heated to generate steam.

As previously mentioned, the tube bundle 4 has a plurality of anti-vibration bars (not shown in FIG. 1 ) positioned between the tubes 3 . 2 shows a portion of a tube bundle 100 comprising a plurality of tube rows 110 , 130 , 150 . An anti-vibration bar 120 is positioned between the first row 110 of tubes and the second row 130 of tubes. An anti-vibration bar 140 is positioned between the second row 130 of tubes and the third row 150 of tubes. The anti-vibration bar 120 has a thickness 122 , and the anti-vibration bar 140 has a thickness 142 . As shown, since the anti-vibration bars 120 , 140 are straight, the thicknesses 122 , 142 are limited by the distance 101 between the rows of tubes 110 , 130 , 150 . As a result, in operation, the anti-vibration bars 120 , 140 do not significantly reduce the amount of possible in-plane motion within the rows 110 , 130 , 150 of tubes.

3-7 , in-plane vibration can be greatly reduced by including a number of improved anti-vibration bars 220 , 240 , 320 , 460 , 480 , 520 . Referring to FIG. 3 , a cross-section is shown of a portion within a U-shaped bend of a tube bundle 200 of a steam generator (not shown). Tube bundle 200 includes rows 210 , 230 , 250 of multiple tubes, wherein any two adjacent tubes have an equal distance 203 between their centers (eg, triangular pitch) (manufacturing tolerances). (accompanying tolerance). Although the disclosed concepts will be described with respect to triangular pitch, it is recognized that the disclosed concepts may be employed in alternative orientations (eg, without limitation, tube bundles having tubes having a 45 degree rotated square pitch (not shown)). will be

The first row 210 of tubes may be in the middle or at the ends of the tube bundle 200 . An anti-vibration bar 220 is positioned between the first row 210 of tubes and the second row 230 of tubes. The anti-vibration bar 220 is solid and has a thickness 222 . 3 to 4C , a first row 210 of tubes includes tubes 212 having a curved centerline 214 positioned in a plane 216 . Similarly, the second row 230 of tubes includes tubes 232 having a curved centerline 234 positioned in a plane 236 . As shown in FIG. 3 , plane 216 and plane 236 are parallel and spaced apart by a distance 206 . Distance 206 is substantially equal to 'twice the outer radius 202 (eg, tube outer diameter 204 ) + distance 201 '. Distance 201 corresponds to distance 101 shown in FIG. 2 .

As shown in FIG. 3 , the thickness 222 of the anti-vibration bar 220 is generally transverse to the planes 216 , 236 and is greater than the distance 201 between the rows 210 , 230 of tubes. With continued reference to FIG. 3 , a second anti-vibration bar 240 is positioned between the second row 230 of tubes and the third row 250 of tubes. Similar to the anti-vibration bar 220 , the anti-vibration bar 240 is solid and has a thickness 242 . 3 to 4C , a third row 250 of tubes includes tubes 252 having a curved centerline 254 positioned in a plane 256 . The plane 256 is parallel to the plane 236 and spaced therefrom by a distance 208 . Distance 208 is substantially equal to 'twice the radius 202 (eg tube outer diameter 204 ) + distance 201 '.

Similar to the thickness 222 of the anti-vibration bar 220 , the thickness 242 of the anti-vibration bar 240 is generally transverse to the planes 236 , 256 , and the rows of tubes 230 , 250 . greater than the distance 201 between them. In operation, this increased thickness prevents significant in-plane (see, eg, planes 216, 236, 256) motion in rows 210, 230, 250 of tubes, which advantageously 200) corresponds to a significant reduction in in-plane vibration within the . As shown in FIG. 3 , the anti-vibration bar 220 is curved and includes a plurality of bends 224 configured to meander between a first row of tubes 210 and a second row 230 of tubes. do.

Similarly, the anti-vibration bar 240 is curved and includes a plurality of bends 244 configured to meander between the second row 230 of tubes and the third row 250 of tubes. The bends 224 , 244 allow the thicknesses 222 , 242 of the anti-vibration bars 220 , 240 to be greater than the thicknesses 122 , 142 of the anti-vibration bars 120 , 140 .

Moreover, the thicknesses 122 , 142 of the anti-vibration bars 120 , 140 are not greater than the distance 101 , whereas the thicknesses 222 , 242 of the anti-vibration bars 220 , 240 are the distance between adjacent centers. It is limited only by subtracting twice the radius 202 (eg, tube outer diameter 204 ) from 203 .

5 shows a portion within a U-shaped bend of a tube bundle 300 of a steam generator (not shown) according to an alternative embodiment of the disclosed concept. As shown, the tube bundle 300 includes an anti-vibration bar 320 positioned between a first row 310 of tubes and a second row 330 of tubes. The first row 310 of tubes may be in the middle or at the ends of the tube bundle 300 . In addition, the first row 310 of tubes includes tubes 312 having a curved centerline (not shown) positioned in a plane 316 . A second row 330 of tubes includes tubes 332 having a curved centerline (not shown) positioned in a plane 336 . The plane 336 is parallel to the plane 316 and spaced therefrom by a distance 306 . Similar to the anti-vibration bars 220 , 240 , the anti-vibration bar 320 has a thickness 322 . Thickness 322 is generally transverse to planes 316 , 336 and is greater than distance 301 between rows 310 , 330 of tubes.

As shown, distance 301 corresponds to distance 306 minus twice the radius 302 (eg, outer diameter 304 of the tube). In a manner similar to the anti-vibration bars 220 , 240 , the anti-vibration bars 320 are structured to meander between the first row 310 of tubes and the second row 330 of tubes. However, the anti-vibration bar 220 , 240 includes a plurality of curved portions 224 , 244 , while the anti-vibration bar 320 includes a plurality of substantially serrated bends 324 . The flexure 324 of the anti-vibration bar 320 is similar to the bends 224 , 244 of the anti-vibration bar 220 , 240 so that the anti-vibration bar 320 has an increased thickness 322 . allow Moreover, similar to the anti-vibration bars 220 and 240 , in operation, the increased thickness 322 of the anti-vibration bars 320 may be substantially in-plane (eg, in rows 310 , 330 ) of tubes. eg in planes 316 , 336 ), which advantageously corresponds to a significant reduction in in-plane vibration within the tube bundle 300 .

6A shows a portion within a U-shaped bend of a tube bundle 400 that includes a plurality of anti-vibration bars 460 , 480 . An anti-vibration bar 460 is positioned between the first row 410 of tubes and the second row 430 of tubes. The first row 410 of tubes may be in the middle or at the ends of the tube bundle 400 . An anti-vibration bar 480 is positioned between the second row 430 of tubes and the third row 450 of tubes. Similar to anti-vibration bars 220 , 240 , anti-vibration bars 460 , 480 include a plurality of bends 464 , 484 structured to meander between rows 410 , 430 , 450 of tubes. do. However, the anti-vibration bars 460 , 480 are less thick than the anti-vibration bars 220 , 240 .

As shown in FIG. 6A , the first row 410 of tubes includes tubes 412 and the second row 430 of tubes includes tubes 432 , and the anti-vibration bar 460 includes tubes ( 412, 432). Because the anti-vibration bar 460 is less thick, there is a gap (see eg, gap 467 ) between the anti-vibration bar 460 and the tubes 412 , 432 . Similarly, an anti-vibration bar 480 is positioned adjacent each of the tubes 432 and the tubes in the third row 450 of tubes. Because the anti-vibration bar 480 is less thick, there is a gap (e.g., a gap (e.g., a gap) between the anti-vibration bar 480 and the tubes in the second row 430 of tubes and the third row 450 of tubes. 487)) exist.

As shown, the anti-vibration bar 460 is positioned substantially along the longitudinal axis 465 , and the anti-vibration bar 480 is positioned substantially along the longitudinal axis 485 . 6B shows a portion of the tube bundle 400 ′ with the anti-vibration bars 460 , 480 displaced along the longitudinal axes 465 , 485 . 6A and 6B , the anti-vibration bar 460 is displaced in a first direction 461 along a longitudinal axis 465 . The anti-vibration bar 480 is displaced in the second direction 481 along the longitudinal axis 485 . The first direction 461 and the second direction 481 are substantially parallel to and opposite to each other. The anti-vibration bars 460 , 480 may be displaced by being pulled and/or pushed out by an operator after fabrication of the tube bundle or by use of suitable mechanisms known in the art.

As shown in FIG. 6B , as the anti-vibration bar 460 moves in a first direction 461 along the longitudinal axis 465 , the anti-vibration bar 460 engages the tube 412 such that a gap exists. (or the gap 467 shown in FIG. 6A is substantially reduced in size). Similarly, as the anti-vibration bar 480 moves in the second direction 481 along the longitudinal axis 485 , the anti-vibration bar 480 engages the tube 432 such that there is no gap ( or the gap 487 shown in FIG. 6A is substantially reduced in size). In this way, the gap between the anti-vibration bars 460, 480 and the tubes in the rows 410, 430, 450 of tubes (see, e.g., gaps 467, 487 in FIG. 6A) is reduced in size. , further reducing the amount of possible in-plane motion.

7 shows a portion within a U-shaped bend of a tube bundle 500 of a steam generator (not shown) according to an alternative embodiment of the disclosed concept. As shown, tube bundle 500 includes a plurality of columns of tubes 510 , 530 , 550 . The first row 510 of tubes may be in the middle or at the ends of the tube bundle 500 . An anti-vibration bar 520 is positioned between the first row 510 of tubes and the second row 530 of tubes. Anti-vibration bar 520 is substantially similar to anti-vibration bar 220 , 240 , generally transverse to plane 516 , 536 and greater than distance 501 between rows 510 , 530 of tubes. It has a large thickness 522 .

An anti-vibration bar 540 substantially similar to the anti-vibration bars 120 , 140 shown in FIG. 2 is positioned between the second row 530 of tubing and the third row 550 of tubing. The anti-vibration bar 540 has a thickness 542 that is generally transverse to the plane 536 parallel to the plane 556 and spaced a distance 508 from the bar 540 . The thickness 542 of the anti-vibration bar 540 is less than the thickness 522 of the anti-vibration bar 520 . Similar to thickness 122 , 142 of anti-vibration bar 120 , 140 , thickness 542 is limited by distance 501 , which may be substantially equal to, but not greater than, distance 501 . As can be seen, the anti-vibration bar 540 is substantially straight, with no bends or curvatures along its longitudinal axis.

In this way, the in-plane vibration in the tube bundle 500 can be greatly reduced by including the anti-vibration bar 520 , while at the same time the in-plane vibration of the anti-vibration bar 540 according to the existing design can be included. Costs can be advantageously saved by this. 7 depicts one of many alternative embodiments that are within the scope of the disclosed concepts. For example and without limitation, having any number of anti-vibration bars 220 , 240 , 320 , 460 , 480 , 520 arranged in any configuration with existing anti-vibration bars 120 , 140 , 540 . are within the scope of the disclosed concept. Additionally, a structure or structures (not shown) in which the anti-vibration bar 220, 240, 320, 460, 480, 520, 540 extends around the tube bundle bend in one of several ways known in the art. It is also understood to be fixed to (not).

The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiments were chosen and in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. explained. It is intended that the appended claims be construed to cover other alternative embodiments of the invention, except to the extent limited by the prior art.

As used herein, the term “solid” shall mean having no interior cavity or opening. As used herein, the term “number” shall mean one or an integer greater than one (ie, plural).

Claims (18)

A steam generator (2) having a primary side for circulating a heated fluid and a secondary side for circulating a fluid to be heated by the heated fluid circulating on the primary side,
a channel head (10) for receiving the heated fluid;
a tube sheet (16) separating the channel head from the secondary side;
A tube bundle (200, 300, 400, 500) having a plurality of tubes arranged in rows and columns, from the channel head, through the tube sheet, and from the secondary side. the tube bundle extending through at least a portion; and
a first plurality of solid anti-vibration bars (220, 320, 460, 520);
The plurality of tubes,
a first row (210, 310, 410, 510) of tubes comprising a first tube (212, 312, 412) having a curved centerline (214) disposed in a first plane (216, 316, 516); and
a second row (230, 330, 530) of tubes, each of said first plurality of anti-vibration bars being disposed between said first row of tubes and a second row of tubes, said second row of tubes comprising a second row of tubes a second tube (232, 332, 432) having a curved centerline (234) disposed in two planes (236, 336, 536), said second plane being parallel to said first plane and said first plane a second row (230, 330, 430, 530) of said tubes spaced a distance (206, 306) from
each of said tubes has a tube outer diameter (204, 304),
each of said first plurality of anti-vibration bars has a thickness (222, 322, 522) generally transverse to said first and second planes;
a thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first and second planes minus the outer diameter of the tube;
each of said first plurality of anti-vibration bars is disposed substantially on a longitudinal axis;
each of said first plurality of anti-vibration bars has a curved centerline intersecting said longitudinal axis;
The first plurality of anti-vibration bars 460 includes a first anti-vibration bar disposed substantially along a first longitudinal axis 465 , the first anti-vibration bar being the first tube 412 . and the second tube 432, a first gap 467 defined between the first anti-vibration bar and the first tube, and a second gap between the first anti-vibration bar and the first tube. defined between the second tube,
The first anti-vibration bar can be displaced in a first direction 461 along the first longitudinal axis, each of the first gap and the second gap so that the first anti-vibration bar is displaced along the first longitudinal axis in the first direction. having a size that changes as you move to
steam generator. The method of claim 1,
Each of the first plurality of anti-vibration bars 220 , 460 , 520 includes a plurality of bends 224 , 464 , 524 , each bend of the first plurality of anti-vibration bars comprises a bend in the tube. winding between the first row (210, 410, 510) of the tube and the second row (230, 430, 530) of the tube, wherein the bend of each of the first plurality of anti-vibration bars is curved;
steam generator. delete The method of claim 1,
The steam generator (2) further comprises a second plurality of solid anti-vibration bars (240, 480),
said plurality of tubes further comprising a third row (250, 450) of tubes;
each of said second plurality of anti-vibration bars is disposed between a second row (230, 430) of said tubes and a third row of said tubes;
the third row of tubes comprises a third tube (252) having a curved centerline (254) disposed in a third plane (256);
the third plane is parallel to the second plane (236) and spaced apart from the second plane (236) by a distance (208);
each of said second plurality of anti-vibration bars has a thickness (242) generally transverse to said second and third planes;
The thickness of each of the second plurality of anti-vibration bars is greater than the distance between the second and third planes minus the tube outer diameter 204 .
steam generator. 5. The method of claim 4,
The plurality of tubes has a triangular pitch, the tube bundle 200 includes a U-shaped bend, the first plurality of anti-vibration bars 220 and the second plurality of vibration- Each of the anti-bars 240 is disposed within the U-shaped bend.
steam generator. 5. The method of claim 4,
The plurality of tubes has a rotated square pitch, the tube bundle 200 includes a U-shaped bend, the first plurality of anti-vibration bars 220 and the second plurality of Each of the anti-vibration bars 240 of
steam generator. The method of claim 1,
The steam generator (2) further comprises a second plurality of anti-vibration bars (540),
said plurality of tubes further comprising a third row (550) of tubes;
each of said second plurality of anti-vibration bars is disposed between a second row (530) of said tubes and a third row of said tubes;
the third row of tubes comprises a third tube having a curved centerline disposed in a third plane (556);
the third plane is parallel to the second plane (536) and spaced apart from the second plane (536) by a distance (508);
each of said second plurality of anti-vibration bars has a thickness (542) generally transverse to said second and third planes;
A thickness of each of the second plurality of anti-vibration bars is less than a thickness 522 of each of the first plurality of anti-vibration bars 520 .
steam generator. 8. The method of claim 7,
The thickness 542 of each of the second plurality of anti-vibration bars 540 is substantially equal to the distance 508 between the second plane 536 and the third plane 556 minus the tube outer diameter.
steam generator. A method of securing tubes in a steam generator (2) against vibration, the tubes being disposed within a tube bundle (200, 300, 400, 400', 500) and arranged in rows and columns, with lanes between the columns. ) is present, in the method of fixing a tube in the steam generator (2),
providing a first row (210, 310, 410, 510) of tubes comprising a first tube (212, 312, 412) having a curved centerline (214) disposed in a first plane (216, 316, 516) to do;
providing a first plurality of solid anti-vibration bars (220, 320, 460, 520); and
providing a second row (230, 330, 430, 530) of tubes, each of the first plurality of anti-vibration bars being disposed between the first row of tubes and the second row of tubes, A second row of columns includes a second tube (232, 332, 432) having a curved centerline (234) disposed within a second plane (236, 336, 536), said second plane being in said first plane. providing a second row (230, 330, 430, 530) of said tubes parallel and spaced a distance (206, 306) from said first plane;
each of said tubes has a tube outer diameter (204, 304),
each of said first plurality of anti-vibration bars has a thickness (222, 322, 522) generally transverse to said first and second planes;
a thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first and second planes minus the outer diameter of the tube;
each of said first plurality of anti-vibration bars is disposed substantially on a longitudinal axis;
each of said first plurality of anti-vibration bars has a curved centerline intersecting said longitudinal axis;
The first plurality of anti-vibration bars 460 includes a first anti-vibration bar disposed substantially along a first longitudinal axis 465 , the first anti-vibration bar being the first tube 412 . and the second tube 432, a first gap 467 defined between the first anti-vibration bar and the first tube, and a second gap between the first anti-vibration bar and the first tube. defined between the second tube,
displacing the first anti-vibration bar in a first direction 461 along the first longitudinal axis, each of the first gap and the second gap so that the first anti-vibration bar moves in the first direction having a size that changes as it moves - containing
How to fix the tube within the steam generator. 10. The method of claim 9,
Each of the first plurality of anti-vibration bars 220 , 460 , 520 includes a plurality of flexures 224 , 464 , 524 , wherein the flexure of each of the first plurality of anti-vibration bars comprises a second portion of the tube. winding between a first row (210, 410, 510) and a second row (230, 430, 530) of the tube, wherein the bend of each of the first plurality of anti-vibration bars is curved;
How to fix the tube within the steam generator. delete 10. The method of claim 9,
providing a second plurality of solid anti-vibration bars (240, 480); and
providing a third row (250, 450) of tubes, each of the second plurality of anti-vibration bars disposed between the second row (230, 430) of tubes and the third row of tubes; The third row of tubes comprises a third tube (252) having a curved centerline (254) disposed in a third plane (256), the third plane being parallel to the second plane (236) and the further comprising providing a third row (250, 450) of said tubes spaced a distance (208) from a second plane (236);
each of said second plurality of anti-vibration bars has a thickness (242) generally transverse to said second and third planes;
The thickness of each of the second plurality of anti-vibration bars is greater than the distance between the second and third planes minus the tube outer diameter 204 .
How to fix the tube within the steam generator. A method of securing tubes in a steam generator (2) against vibration, the tubes being disposed within a tube bundle (200, 300, 400, 400', 500) and arranged in rows and columns, with lanes between the columns. ) is present, in the method of fixing a tube in the steam generator (2),
providing a first row (210, 310, 410, 510) of tubes comprising a first tube (212, 312, 412) having a curved centerline (214) disposed in a first plane (216, 316, 516) to do;
providing a first plurality of solid anti-vibration bars (220, 320, 460, 520); and
providing a second row (230, 330, 430, 530) of tubes, each of the first plurality of anti-vibration bars being disposed between the first row of tubes and the second row of tubes, A second row of columns includes a second tube (232, 332, 432) having a curved centerline (234) disposed within a second plane (236, 336, 536), said second plane being in said first plane. providing a second row (230, 330, 430, 530) of said tubes parallel and spaced a distance (206, 306) from said first plane;
each of said tubes has a tube outer diameter (204, 304),
each of said first plurality of anti-vibration bars has a thickness (222, 322, 522) generally transverse to said first and second planes;
a thickness of each of the first plurality of anti-vibration bars is greater than the distance between the first and second planes minus the outer diameter of the tube;
The method of securing a tube within the steam generator (2) comprises the steps of providing a second plurality of solid anti-vibration bars (240,480); and providing a third row (250, 450) of tubes, each of the second plurality of anti-vibration bars being disposed between the second row (230, 430) of tubes and the third row of tubes; , the third row of tubes comprises a third tube (252) having a curved centerline (254) disposed in a third plane (256), the third plane being parallel to the second plane (236) and further comprising providing a third row (250, 450) of said tube spaced a distance (208) from said second plane (236);
each of said second plurality of anti-vibration bars has a thickness (242) generally transverse to said second and third planes;
a thickness of each of the second plurality of anti-vibration bars is greater than the distance between the second and third planes minus the tube outer diameter (204);
The first plurality of anti-vibration bars 460 include a first anti-vibration bar disposed substantially along a first longitudinal axis 465 , and the second plurality of anti-vibration bars 480 include substantially a second anti-vibration bar disposed along a second longitudinal axis (485) parallel to the first longitudinal axis, the first anti-vibration bar comprising the first tube (412) and the second tube (432) and the second anti-vibration bar is disposed adjacent to the second tube and the third tube, and a first gap is formed between the first anti-vibration bar and the first tube ( 467), a second gap between the first anti-vibration bar and the second tube, and a third gap 487 between the second anti-vibration bar and the second tube; , there is a fourth gap between the second anti-vibration bar and the third tube,
displacing the first anti-vibration bar in a first direction (461) along the first longitudinal axis; and
displacing the second anti-vibration bar in a second direction (481) along the second longitudinal axis, the second direction being opposite the first direction, the first gap, the second gap, the wherein each of the third gap and the fourth gap has a size that decreases as the first anti-vibration bar is displaced in the first direction and the second anti-vibration bar is displaced in the second direction. displacing the second anti-vibration bar;
How to fix the tube within the steam generator. 14. The method of claim 13,
The tube has a triangular pitch, the tube bundle 400 includes a U-shaped bend, the first plurality of anti-vibration bars 460 and the second plurality of anti-vibration bars 480 each is disposed within the U-shaped bend
How to fix the tube within the steam generator. 10. The method of claim 9,
providing a second plurality of anti-vibration bars (540); and
providing a third row (550) of tubes, each of the second plurality of anti-vibration bars being disposed between the second row (530) of tubes and a third row of tubes, and Row 3 includes a third tube having a curved centerline disposed within a third plane 556 , the third plane being parallel to the second plane 536 and a distance 508 from the second plane 536 . ), further comprising providing a third row (550) of said tubes,
each of said second plurality of anti-vibration bars has a thickness (542) generally transverse to said second and third planes;
A thickness of each of the second plurality of anti-vibration bars is less than a thickness 522 of each of the first plurality of anti-vibration bars 520 .
How to fix the tube within the steam generator. 14. The method of claim 13,
Each of the first plurality of anti-vibration bars 220 , 460 , 520 includes a plurality of flexures 224 , 464 , 524 , wherein the flexure of each of the first plurality of anti-vibration bars comprises a second portion of the tube. winding between a first row (210, 410, 510) and a second row (230, 430, 530) of the tube, wherein the bend of each of the first plurality of anti-vibration bars is curved;
How to fix the tube within the steam generator. 14. The method of claim 13,
Each of the first plurality of anti-vibration bars 320 includes a plurality of flexures 324, and each flexure of the first plurality of anti-vibration bars 320 includes a first row 310 of the tube and a portion of the tube. tortuous between the second rows (330), wherein the bends of each of the first plurality of anti-vibration bars are substantially serrated;
How to fix the tube within the steam generator. 14. The method of claim 13,
providing a second plurality of anti-vibration bars (540); and
providing a third row (550) of tubes, each of the second plurality of anti-vibration bars being disposed between the second row (530) of tubes and a third row of tubes, and Row 3 includes a third tube having a curved centerline disposed within a third plane 556 , the third plane being parallel to the second plane 536 and a distance 508 from the second plane 536 . ), further comprising providing a third row (550) of said tubes,
each of said second plurality of anti-vibration bars has a thickness (542) generally transverse to said second and third planes;
a thickness of each of the second plurality of anti-vibration bars is less than a thickness 522 of each of the first plurality of anti-vibration bars 520
How to fix the tube within the steam generator.

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