JPH06185891A - Rod baffle of tubular type heat exchanger - Google Patents

Abstract

PURPOSE: To give additional support to the tubes of a tube bundle by providing a baffle cross-ring with holes piercing through the inner side surface thereof and fixing each of rods to the baffle cross-ring by press fitting an edge portion of each of the rods in respective holes. CONSTITUTION: Plurality of vertical rods 64 of a certain diameter, having a first edge portion 88 and a second edge portion 90, are fixed to a baffle ring 70 mutually in parallel and spaced at equal distances. The first end portion 88 of each of the vertical rods 64 is fixed to the baffle ring 70 through an appropriate means, e.g. tack welding. The second edge portion 90 of each of the vertical rods 64 is inserted into each of holes 86 from the side of a first surface 82 of the baffle cross-ring 76 which forms a tight fitting between the second end portion 90 of the vertical rod 64 and the hole 86. Therefore, the vertical rods 64 can be fixed to the baffle cross-ring 76.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a tubular heat exchanger.
In particular, the present invention relates to a two pass tubular heat exchanger with rod baffle support.

[0002]

BACKGROUND OF THE INVENTION Tubular heat exchangers have long been known as effective devices for heating fluids and utilizing thermal energy. Such tubular heat exchangers have been highly developed. These heat exchangers are usually constructed by surrounding a tube bundle attached to a tube sheet with a barrel. The fluid flowing in the body indirectly exchanges heat with another fluid flowing in the tube. Due to their low pressure drop characteristics on the shell side, these heat exchangers have become popular for gas supply services and are also used as water heaters. There is also a two-pass design with a longitudinal plate along the axis of the barrel to create perfect counterflow and to avoid temperature crossovers that would normally occur in a single barrel pass structure. Used. The most common type of tube bundle in a double-pass structure is U
Shaped tubes, split ring floating heads, and pull-through floating heads. In a two-pass design, an axial baffle is installed in the tubular heat exchanger barrel, which forms the longitudinal baffle. This longitudinal baffle creates two sectioned side wall passages, an inlet passage and an outlet passage. In such a configuration, the fluid enters the shell through a single nozzle at the tubesheet end of the heat exchanger and flows axially through the shell-side inlet passage, at the end of the longitudinal baffle.
A direction change of 80 ° is performed, and then the liquid flows axially through the outflow passage on the cylinder side and returns to the outlet nozzle.

[0003]

In order to reduce the vibration of the tube bundle caused by the flow of fluid without causing excessive flow obstruction and pressure loss, the tube bundle of the existing tubular heat exchanger has to be reduced. It may be necessary to provide bar baffle support. However, it is difficult to provide such rod baffle support because in the case of a two-barreled structure there is a longitudinal baffle which prevents the vertical rod from passing from one side of the bundle to the other.

[0004]

SUMMARY OF THE INVENTION Accordingly, a primary object of the present invention is to provide a rod baffle that can be easily inserted into a tube bundle of a two-pass tube heat exchanger to reduce flow-induced vibrations in the tube bundle. is there.

Another object of the present invention is to provide a two-pass tubular heat exchanger with a plurality of rod baffles inserted into the bundle to reduce flow-induced vibrations in the bundle.

Yet another object of the present invention is to reduce the flow-induced vibrations of the tube bundle of a two-pass tubular heat exchanger without causing excessive flow obstruction and pressure loss, and to provide a plurality of rod baffles into the tube bundle. Is to provide a method for inserting.

Other objects, goals, features, advantages, embodiments, etc. of the present invention will become apparent to those skilled in the art from this description, accompanying drawings, and claims.

More specifically, the present invention is a bar baffle for use in a two pass tubular heat exchanger having a tube bundle and a longitudinal baffle separating the tube bundle into a first pass and a second pass of the tube. Regarding This rod baffle according to the invention
It has a semi-circular baffle ring and a baffle cross ring fixed to it, which encloses a first tube path in the upper half of the shell of the heat exchanger or a second tube path in the lower half.
A plurality of rods extend vertically from the semi-circular baffle ring to the baffle cross ring to support the upper half tube or the lower half tube of the tube bundle. The baffle cross ring has a plurality of holes extending through the inner surface thereof, one of these holes
One end of each rod is inserted into the one, thereby securing each rod to the baffle cross ring. Therefore, it is not necessary to perform welding inside the tube bundle. The second end of each rod is then secured to the semi-circular baffle ring, which completes the insertion of the rod baffle into the tube bundle. Thus, the rod baffle can be inserted without disassembling the tube bundle.

The materials used in the heat exchanger of the present invention are standard materials such as carbon steel for the shell and alloy steel for the tube sheet.

[0010]

The drawings show a preferred embodiment of the invention. However, the illustrated embodiments do not limit the present invention in any way.

FIG. 1 is a side elevational view of one embodiment of a two-pass tubular heat exchanger according to the present invention, which heat exchanger is designated generally by the numeral 10. The heat exchanger 10 has a first end 14
And an elongated substantially cylindrical housing or barrel 12 having a second end 16. A pipe inlet 18 is provided in the upper barrel portion of the barrel 12 near the first end 14. A pipe outlet 20 is provided in the lower portion of the body 12 near the first end portion 14. A barrel inlet 22 is provided in the upper portion of the barrel between the second end 16 of the barrel 12 and the pipe inlet 18. A trunk outlet 24 is provided in the lower portion of the trunk between the second end 16 of the trunk 12 and the tube outlet 20. A tube bundle generally designated by the numeral 30 is installed inside the barrel 12.

FIG. 2 is an enlarged view of a tube bundle 30 having a first end 31 and a second end 32. The tube bundle 30 is comprised of a plurality of tubes having a first pulse of a substantially longitudinal tube or tube section 33 and a second pass of a substantially longitudinal tube or tube section 34. The first pass 33 and the second pass 34 are the tube bundle 3
It extends parallel to the longitudinal axis of zero. A plurality of U-shaped bend pipes or pipe portions 36 connect the pipes or pipe portions corresponding to the first pass 33 and the second pass 34, respectively. The tubes consisting of the first pass 33, the second pass 34 and the U-shaped bend pipe 36 can either be integrally formed or can be made from separate elements. In any case, methods for making U-shaped tubes are well known in the art.

The pipes or pipe portions of the first pass 33 and the second pass 34 can be connected not only by the U-shaped pipe system but also by a system using, for example, a split ring floating head or a pull-through floating head.

At the first end 31 of the tube bundle 30, a tube sheet or plate 38 is placed substantially perpendicular to the longitudinal axis of the tube bundle. The plurality of tubes of the first pass 33 extend through the tube sheet 38 and fluidly connect to the tube inlet 18 (see FIG. 1). The plurality of tubes in the second pass 34 extend through the tubesheet 38 and fluidly connect to the tube outlet 20 (see FIG. 1). Thus, the first pass 33, the second pass 34, and the U-shaped vent pipe 3
A fluid flow connection is established between the pipe inlet 18 and the pipe outlet 20 by a plurality of pipes constituted by 6.

A longitudinal baffle 40 is located between the first tube pass 33 and the second tube pass 34. The longitudinal baffle 40 has a first end 42 for sealing engagement with the tube bundle 30 and a second end 44 near the second end 32 of the tube bundle 30. When the tube bundle 30 is installed in the barrel 12 as shown in FIG. 1, both sides of the longitudinal baffle 40 are in sealing engagement with the inner surface of the barrel 12 to move the barrel 12 into the upper chamber 46 and the lower chamber 48. Partition into An opening is provided between the second end 44 of the longitudinal baffle 40 and the second end 16 of the barrel 12, which allows passage of the U-shaped bend tube 36, and also the upper chamber 46.
And a direct fluid flow connection between the lower chamber 48 and the lower chamber 48.

A plurality of plate baffles 50 are installed in the tube bundle 30 to support the first tube path 33 and the second tube path 34. Although the goal of the present invention is to provide additional tube support to the tube bundle by means of rod baffles, the existing plate baffle 50 remains intact in tube bundle 30 after the addition of the inventive rod baffle. A plurality of connecting rods 52 extend parallel to the longitudinal axis of the tube bundle 30 and are arranged at equal intervals along the peripheral edge of the tube bundle. The connecting rod 52 has a first end 54 and a second end 56. The first end 54 of the connecting rod 52 is fixed to the tube plate 38, and the second end 56 is fixed to the plate baffle 50 closest to the second end of the tube bundle 30. The purpose of the connecting rods 52 is to properly maintain the spacing between each plate baffle 50 and to maintain the plate baffles in place.

According to the present invention, a plurality of vertical bar baffles 60 and a plurality of horizontal bar baffles 62 are installed between existing plate baffles 50 to provide additional support for the tubes of tube bundle 30.

FIG. 3 shows a vertical bar baffle 60 supporting the first tube path 33 and another vertical bar baffle 60 supporting the second tube path 34. The vertical bar baffle 60 supporting the first tube path 33 comprises a semi-circular structure surrounding the first tube path 33 and supporting a plurality of vertical bars 64. The vertical bar baffle 60 supporting the second pipe path 34 is
It comprises a semi-circular structure surrounding 4 and supporting a plurality of vertical bars 64. At least one vertical bar baffle 60
The two connecting rods 52 are fixed and supported.

FIG. 4 shows a horizontal bar baffle 62 supporting the first tube path 33 and another horizontal bar baffle 62 supporting the second tube path 34. The horizontal bar baffle 62 supporting the first tube path 33 comprises a semi-circular structure surrounding the first tube path 33 and supporting a plurality of horizontal bars 66. The horizontal bar baffle 62 supporting the second pipe path 34 is
A semi-circular structure surrounding 4 and supporting a plurality of horizontal bars 66. At least one horizontal bar baffle 62
The two connecting rods 52 are fixed and supported.

The vertical bar baffle 60 of FIG. 3 and the horizontal bar baffle 62 of FIG. 4 have their respective vertical bars 64 and horizontal bars 66.
Are shown adjacent to every other row of tubes,
With this support device according to the invention, the rods of each baffle assembly, which are inserted into the spaces between adjacent rows of tubes, must only be inserted into a number of spaces less than the total number of these spaces. Good. These bars are in each space, 1
Every other space, every two spaces, and what other spaces are inserted is not important. The minimum number of rods in a baffle assembly is sufficient for all baffle sets that provide radial support for each tube forming the tube bundle. Also, since the pressure drop on the shell side of the tubular heat exchanger is minimized when the number of rods in the baffle assembly is minimal, it is necessary to determine the maximum number of rods in the baffle assembly by It is preferable to consider the functional restrictions. In any event, however, it is important to provide each baffle assembly of the set with a sufficient number of rods to ensure radial support of each tube as a baffle set.

The vertical rod baffle 60 of the present invention is more clearly shown in FIGS. This vertical bar baffle 60
Comprises a baffle ring 70 comprised of a semi-circular member having a first end 72 and a second end 74. The first end 72 and the second end 74 of the baffle ring 70 are
8 and a second end 80 and a baffle cross ring 76 having an inner first surface 82 and an outer second surface 84. The first end 72 of the baffle ring 70 is fixed near the first end 78 of the baffle cross ring 76. The second end of the baffle ring 70 is secured to the baffle cross ring 76 near the second end 80. Preferably, the first end 72 of the baffle ring 70 is secured to its first surface 82 near the first end 78 of the baffle cross ring 76, and the second end 74 of the baffle ring 70 is also baffle cross ring 76. Fixed to its first face 82 near the second end 80 of the. As shown in FIG. 6, a plurality of holes 86 extend through the baffle cross ring 76 from its first surface 82 to its second surface 84. Preferably, the holes 86 are holes extending from the first surface 82 to the second surface 84 of the baffle cross ring 76, but also from the first surface 82 without penetrating the full thickness of the baffle cross ring. It may be a blind hole that passes to a certain point between the second surface 84 and the second surface 84. Preferably, the holes 86 are evenly spaced between the first end 78 and the second end 80 of the baffle cross ring 76, and the positions of the holes match those of the vertical rod 64. To be

A plurality of constant diameter vertical bars 64 having a first end 88 and a second end 90 are fixed between the baffle ring 70 and the baffle cross ring 76 in parallel and at equal intervals. To be done. First end 88 of each vertical bar 64
Is secured to the baffle ring 70 by any suitable means, such as tack welding. The second end 90 of each vertical bar 64 is inserted into the respective hole 86 from the side of the first surface 82 of the baffle cross ring 76, and the interference fit between the second end 90 of the vertical bar 64 and the hole 86. It will be done. This secures the vertical bar 64 to the baffle cross ring 76.

As shown in FIGS. 8 and 9, the hole 86 is preferably tapered so that its diameter decreases from the first surface 82 to the second surface 84 of the baffle cross ring 76. The diameter of the hole 86 in the first surface 82 of the baffle cross ring 76 is larger than the diameter of the vertical rod 64, and the diameter of the hole 86 in the second surface 84 of the baffle cross ring is smaller than the diameter of the vertical rod 64. . By such tapering the hole 86, a downward pressure is applied when inserting the second end 90 of the vertical rod 64 into the hole 86 so that the second end 90 of the vertical rod 64 becomes wedge-shaped. It is pushed into the hole 86, so that the second end 90 of the vertical rod 60 is firmly fixed to the baffle cross ring 76.
Thus, each vertical bar 64 can be secured to the baffle cross ring without requiring access to the anchoring points of it and the baffle cross ring 76. Since such a fixed point is far inside the tube bundle 30, access to it is very difficult in practice.

The incorporation of the rod baffle of the present invention into the tube bundle 30 shown in FIG. 2 is preferably done as follows. First, the tube bundle 30 is removed from the barrel. First pipe pass 3
To support the three tubes, a baffle ring 70 is placed around the first tube path and the connecting rod 52 at right angles to the first tube path 33 at the point where this support is intended. The baffle ring 70 is installed so as to contact at least one connecting rod 52.

The baffle cross ring 76 is the first pipe pass 3
3 at right angles to the first pipe pass and longitudinal baffle 40
The first end 72 of the baffle ring 70 contacts a point near the first end 78 of the baffle cross ring 76, and the second end 74 of the baffle ring is positioned between the baffle ring 70 and the baffle ring 70. A point near the second end 80 is contacted. The first end 72 of the baffle ring 70 is then secured near the first end 78 of the baffle cross ring 76 and the second end 74 of the baffle ring is secured to the baffle cross ring by suitable means, such as welding. It is fixed near the second end 80. Welding here means to bring about local welding of the metal. This welding is performed by heating to a suitable temperature with or without pressure and with or without filler metal.

The combination of baffle ring 70 and baffle cross ring 76 forms a one-piece structure that completely surrounds the first tube path 33 at the point where it should be supported. The structure is held securely in place by fixing the baffle ring 70 to the connecting rod 52 around the first tube path 33 by suitable means such as welding.

The vertical bar 64 is then inserted into the required space between adjacent rows of tubes of the first tube path 33. The vertical bars 64 are generally vertical and are horizontally spaced from each other and spaced parallel to each other. A downward pressure is then applied to the vertical bar 64, which causes the second end 90 of the vertical bar.
Is driven into the hole 86 firmly like a wedge. The first end 88 of the vertical rod is then secured to the baffle ring 70 by any suitable means such as welding. Thus, each vertical bar 64 extends generally vertically between the baffle ring 70 and the baffle cross ring 76 and is fixedly secured.

At least one vertical bar baffle 60 is also installed in the second tube path 34 in the same manner as in the case of the first tube path 33 described above to support the second tube path 34.

Horizontal bar baffles 62 are also installed in the first and second tube paths 33 and 34 to support the tubes. Baffle ring 70 of each horizontal bar baffle 62
And the baffle cross ring 76 is the vertical bar baffle 6 described above.
It is installed as in the case of 0. Horizontal bars 66 are then inserted into the required space between adjacent rows of tubes to support the tubes. The horizontal bars 66 are generally horizontal and vertically spaced parallel to each other. Horizontal bar 66
Can be secured at its ends to the baffle ring 70 by any suitable means such as welding.

The embodiments of the invention described herein are still capable of various modifications in its entirety or in the structure and arrangement of parts or elements without departing from the spirit of the claims. .

[Brief description of drawings]

FIG. 1 is a side elevational view of a tubular heat exchanger according to the present invention, with a portion cut away to reveal the interior.

2 is an enlarged side elevational view of a tube bundle according to the present invention removed from the barrel of the heat exchanger of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is an enlarged elevational view of the upper vertical bar baffle shown in FIG.

6 is a top view of the vertical bar baffle of FIG.

7 is a left side view of the vertical bar baffle of FIG.

8 is a sectional view taken along line 8-8 of FIG.

9 is an enlarged view of the baffle cross ring shown in FIG.

[Explanation of symbols]

 10 heat exchanger 12 barrel 30 tube bundle 33 first tube path 34 second tube path 40 longitudinal baffle 50 plate baffle 52 connecting rod 60 vertical rod baffle 62 horizontal rod baffle 64 vertical rod 66 horizontal rod 70 baffle ring 76 baffle cross ring 86 Hole

Claims (7)

[Claims] 1. A rod baffle for a two-pass tubular heat exchanger, the baffle ring comprising a semi-circular member having a first end and a second end, a first end, a second end and an inner surface. And a member having an outer surface, wherein a first end of the baffle ring is fixed to a first end of the baffle cross ring and a second end of the baffle ring is the baffle. A baffle cross ring secured to a second end of the cross ring and having a plurality of holes through which an inner surface of the baffle cross ring passes; a plurality of baffle cross rings each having a first end and a second end. A first end of each of the rods is secured to the baffle ring such that the rods are spaced parallel to each other and secured between the baffle ring and the baffle cross ring, and Each of the sticks A rod baffle comprising a plurality of rods, the second end of which is inserted into one of the holes. 2. The rod baffle of claim 1, wherein the hole extending through the inner surface of the baffle cross ring has a substantially circular cross section. 3. The hole passing through the inner surface of the baffle cross ring is tapered such that the diameter decreases from the inner surface toward the outer surface, and the diameter of the hole on the inner surface is The rod baffle of claim 2, wherein the rod baffle is larger than the rod diameter and the diameter of the hole at some point between the inner and outer surfaces is smaller than the rod diameter. 4. An apparatus comprising: a plurality of parallel tubes arranged to form a plurality of parallel rows of tubes; a semi-circular member having a first end and a second end. A first baffle cross ring comprising at least one first baffle having a first baffle ring, a member having a first end and a second end and an inner surface and an outer surface, the first baffle cross ring comprising:
A first end of the baffle ring is secured to an inner surface thereof at a first end of the first baffle cross ring and a second end of the first baffle ring is provided at a second end of the baffle cross ring. A first baffle cross ring fixed to the inner side surface of the first baffle cross ring and having a plurality of holes through which the inner side surface of the first baffle cross ring, each of which has a first end and a second end. The first rods of the first rods are parallel to each other and are equally spaced apart and fixed between the first baffle ring and the first baffle cross ring. A plurality of first rods, a first end and a first end secured to the first baffle ring, and a second end of each of the first rods inserted into one of the holes. A second baffle ring composed of a semi-circular member having two ends And at least one second baffle, the second baffle cross ring composed of members having a first end and a second end and an inner surface and an outer surface, said second
A first end of the baffle ring is secured to an inner surface thereof at a first end of the second baffle cross ring and a second end of the second baffle ring is a second end of the second baffle cross ring. A second baffle cross ring fixed to an inner surface thereof, a plurality of second rods each having a first end and a second end, the second rods being parallel and equidistant from each other. A plurality of second rods each having a first end and a second end of the second rod fixed to the second baffle ring so as to be fixed to the second baffle ring. A first baffle ring of the first baffle and a first baffle cross ring combine to enclose at least a portion of the tubes in a plane generally perpendicular to the plurality of tubes; The plurality of first rods of each of the adjacent rows of tubes. The second baffle ring of the second baffle and the second baffle cross ring in combination with each other so as to be substantially perpendicular to the plurality of tubes. Enclosing at least a portion of the tubes in a plane, and the plurality of second bars of the second baffle extending between each adjacent row of tubes to contact each tube of the row of tubes. A device equipped with a structure that supports it. 5. The hole through the inner surface of the first baffle cross ring has a substantially circular cross section.
Stick baffle. 6. The diameter of the hole passing through the inner surface of the first baffle cross ring is tapered such that the diameter decreases from the inner surface toward the outer surface, and the diameter of the hole on the inner surface. Is greater than the diameter of the first rod, and the diameter of the hole at some point between the inner surface and the outer surface is less than the diameter of the first rod. 7. A plurality of parallel tubes arranged to form a plurality of parallel rows of tubes, the longitudinal direction separating the plurality of tubes into a first pass and a second pass of the tubes. A two-pass tubular heat exchanger having a baffle and a plurality of connecting rods provided parallel to the longitudinal axis of the tube bundle of the plurality of tubes and spaced from each other along the periphery of the tube bundle. A method of incorporating rod baffles in a bundle of tubes, wherein at least one first baffle ring is placed at a right angle to the plurality of tubes at the periphery of the first pass of the tubes,
Wherein the first baffle ring is composed of a semi-circular member having a first end and a second end, and the first baffle ring contacts at least one of the connecting rods, at least one A first baffle cross ring at a right angle to the plurality of tubes between the first pass of the tubes and the longitudinal baffle, where the first baffle cross ring is at the first end. The baffle ring has a second end and a member having an inner surface and an outer surface, the inner surface having a plurality of holes therethrough, and the first end of the first baffle ring has the first end.
Contacting a first end of the baffle cross ring and a second end of the first baffle ring contacting a second end of the first baffle cross ring, the first end of the first baffle ring A portion to the first end of the first baffle cross ring and a second end of the first baffle ring to the second end of the first baffle cross ring, whereby the first baffle ring And a first baffle cross ring in combination to form a continuous loop around the first pass of the tube, the first baffle ring fixed to the at least one continuous rod, and First rods of the plurality of rods in parallel with each other in the horizontal direction and spaced apart from each other in a generally vertically extending position between adjacent rows of tubes of the first pass of the tubes, wherein 1 bar each has a first end and a second end, Each of its first
An end is inserted into one of the holes extending through the inner surface of the first baffle cross ring and pressure is applied to each of the first rods to move the first end of the rods to the first end.
Each first rod is fixed to the first baffle cross ring by being pushed into the hole on the inner surface of the baffle cross ring,
The second end of each of the first rods is fixed to the first baffle ring so that the plurality of first rods are separated from each other in a horizontal direction in parallel with one common alignment axis. The method comprises the steps of: fixing the first baffle ring and the first baffle cross ring generally vertically.