DE102016015013A1 - Support of pipes wound heat exchanger - Google Patents

Abstract

The invention relates to a wound heat exchanger (1), comprising: a tube bundle (3) having a plurality of tubes (30) for receiving a fluid medium (M), the tubes (30) each helically onto a core tube (300) of the heat exchanger (1 ), which extends along a longitudinal axis (z), so that the tube bundle (3) a plurality of tube layers (4a, 4), which are arranged in a radial direction (R) of the tube bundle (3) one above the other, wherein between a innermost tube layer (4a) and the core tube (300) and between each two adjacent tube layers (4) a plurality of webs (10) is provided, wherein the webs (10) respectively along the longitudinal axis (z) extend, and wherein the respective Webs (10) has a top (10a) with a plurality of concave recesses (10c), wherein in the respective recess (10c) a pipe section (30a) of the top (10a) adjacent tube (30) is arranged. According to the invention, two webs (10) which are adjacent in the radial direction (R) are connected to one another via tension elements (40) extending in the radial direction (R), which are respectively fixed on both adjacent webs (10) in such a way that they slide of the respective web (10) with respect to the respective tension element (40) in the direction of the longitudinal axis (z) of the tube bundle (3) is prevented.

Description

The invention relates to a wound heat exchanger according to claim 1.

Such wound heat exchangers are e.g. used in physical scrubbing for acid gas removal (e.g., rectisol process), in ethylene plants, or in liquefied natural gas (LNG) plants.

Coiled heat exchangers have a tube bundle, which is arranged in a jacket space of the wound heat exchanger, which is surrounded by a jacket of the heat exchanger. The tube bundle in this case has a plurality of tubes for receiving a fluid medium, so that this can exchange heat indirectly with a guided in the shell space fluid medium. The tubes are each helical, in the manner of a helix, wound on a core tube of the heat exchanger, which extends along a longitudinal axis, so that the tube bundle has a plurality of tube layers, which in a radial direction of the tube bundle, which is perpendicular to the longitudinal axis and points away from this, are arranged one above the other. In this case, between a (in the radial direction) innermost layer of tubes and the core tube and between each two adjacent tube layers a particular constant plurality of webs is provided, wherein the webs each extend along the longitudinal axis, and wherein the webs each have an upper side with a plurality have concave recesses, in each of which a pipe section of a pipe of a voltage applied to the top pipe layer is arranged.

Said webs serve to define the axial position of the tubes and to divert the weight force into the outer container via support arms, to which the webs are welded, when the WT is in vertical operation.

When winding the tubes on the core tube - in this case, the core tube extends along the horizontal and is rotated about its longitudinal axis - there is the problem in this regard that the webs usually not completely tolerances rest on the pipes, so that the tube bundle with increasing diameter loosens. In this case, the pipe sections extending above the core tube are compressed due to their weight, whereas the tube sections extending below the core tube sag towards the bottom due to their weight force. This means that the bundle of tubes, initially circular in cross-section, bulges downwards. This tummy travels as the core tube rotates relative to the tube bundle, with harmful shearing and frictional forces acting on the tubes of the tube bundle, which can result in damage to the tubes.

From the DE 26 13 745 webs are known for the arrangement between adjacent pipe layers, which are to be used in the region of the beginning and the end of a tube bundle. In this case, the webs have grooves, in each of which the complete cross section of the respective tube is received. The web portions arranged between the grooves in each case form a recess, the web which is adjacent in the radial direction upwards being received in a form-fitting manner in these recesses, so that it can slide along the extension direction of the adjacent web.

However, such a movement of the webs against each other requires that the respective guided in the recesses web has enough play in the recesses, so that a sliding movement over the entire length of the web can occur as unhindered as possible. However, such a game again favors a bulging of the tube bundle during winding.

On this basis, the present invention therefore has the object to provide a wound heat exchanger, which is improved in terms of the aforementioned problem.

This object is achieved by a heat exchanger with the features of claim 1. Advantageous embodiments of the invention are specified in the corresponding subclaims and are described below.

• - einem Rohrbündel aufweisend mehrere Rohre zur Aufnahme eines fluiden Mediums, wobei die Rohre jeweils helikal auf ein Kernrohr des Wärmeübertragers gewickelt sind, das sich entlang einer Längsachse erstreckt, so dass das Rohrbündel mehrere Rohrlagen aufweist, die in einer radialen Richtung des Rohrbündels übereinander angeordnet sind,
• - wobei zwischen einer innersten Rohrlage und dem Kernrohr sowie zwischen je zwei benachbarten Rohrlagen eine (insbesondere konstante) Mehrzahl an Stegen vorgesehen ist, wobei sich die Stege jeweils entlang der Längsachse erstrecken, und wobei
• - der jeweilige Steg eine Oberseite mit einer Vielzahl an konkaven Ausnehmungen aufweist, wobei in der jeweiligen Ausnehmung ein Rohrabschnitt eines Rohres einer an der Oberseite anliegenden Rohrlage des Rohrbündels angeordnet ist.

According to claim 1, a coiled heat exchanger is provided thereafter, with:

• - A tube bundle comprising a plurality of tubes for receiving a fluid medium, wherein the tubes are each helically wound on a core tube of the heat exchanger, which extends along a longitudinal axis, so that the tube bundle comprises a plurality of tube layers which are arranged one above the other in a radial direction of the tube bundle .
• - Wherein between an innermost layer of pipe and the core tube and between each two adjacent pipe layers a (in particular constant) plurality of webs is provided, wherein the webs each extend along the longitudinal axis, and wherein
• - The respective web has an upper side with a plurality of concave recesses, wherein in the respective recess a pipe section of a tube of a voltage applied to the top layer of the tube bundle pipe is arranged.

According to the invention it is now provided that two each adjacent in the radial direction webs extending in the radial direction tensile elements are connected to each other, which are respectively fixed to two adjacent webs so that a movement or sliding of the respective web with respect to the respective tension element in the direction of the longitudinal axis of the tube bundle is prevented or blocked.

In other words, the determination of the tension elements on the webs takes place in such a way that the degree of freedom of movement of the webs with respect to the respective tension element fixed thereto is blocked in the direction of the longitudinal axis, so that the webs are e.g. can not slide with respect to the traction elements fixed thereto in the direction of the longitudinal axis.

However, however, the tension members may have some elasticity, so that adjacent webs connected together by the tension members may have some mobility relative to each other since the tension members are e.g. do not have to be completely rigid. In this respect, according to one embodiment of the invention, it is sufficient in particular if the restriction of the degree of freedom of movement described above applies at least to a section (for example end section) of the respective tension element via which the respective tension element is connected to the respective web.

The determination of the tension elements on the webs is preferably further carried out so that also the translational movement degree of freedom of the respective web with respect to the respective thereto fixed tension element or with respect to the respective fixed end portion of the respective tension element in the radial direction (ie in the direction of extension of the respective tension element) blocked is, in order not to affect the actual effect of the tension elements, namely the radial fixing of the pipe layers.

The respective tension element can each be non-positively and / or materially and / or positively connected to two adjacent webs.

The determination of the tension elements on the respective web can furthermore also take place such that apart from the two above-mentioned degrees of freedom of movement (radial direction or direction of the longitudinal axis) at least one, several or all further degrees of freedom of movement of the respective web are blocked relative to the respective tension element fixed thereto is or are.

According to a further embodiment, it is provided that the tension elements are clamped in each case via their two opposite end portions fixed to the respective web, wherein a fixed clamping is also referred to herein as a rigid connection. In other words, all degrees of freedom of movement of the respective web (three translational and three rotational degrees of freedom of movement) are blocked with respect to the respective tension element fixed to the web or to the respective end section of the tension element fixed to the web.

According to one embodiment of the invention it is provided that the tension elements are cylindrical.

Furthermore, according to a preferred embodiment of the invention, it is provided that the tension elements, in particular for compensation of temperature-induced stresses and / or deformations of the tube bundle, are elastically bendable in the direction of the longitudinal axis, so that the tube bundle is flexible in the direction of the longitudinal axis.

Furthermore, according to a preferred embodiment of the invention, it is provided that the webs extend in the direction of the longitudinal axis over the entire length of the tube bundle. Likewise, the tension members are preferably in e.g. Periodically, over the entire length of the tube bundle along the corresponding webs arranged.

Furthermore, it is provided according to an embodiment that the respective pipe section protrudes out of its recess in the radial direction, wherein preferably the respective pipe section protrudes in the radial direction of the tube bundle with more than half of its pipe cross-section from the associated recess.

Furthermore, according to one embodiment of the invention, it is provided that the tension elements each protrude between two recesses from the upper side of the respective web in the radial direction.

In this case, according to one embodiment, the tension elements are preferably rigidly connected to the web or the upper side, from which they respectively protrude in the radial direction of the tube bundle with an upper end section, for. B. via a cohesive connection (in particular welded connection) or via a frictional connection (eg., Screw connection).

Preferably, it is further provided that the tension elements are each connected to the said upper end portion rigidly connected to the adjacent web in the radial direction.

In this case, according to an embodiment, the respective upper end section can be inserted into a passage opening of the web adjacent in the radial direction.

Furthermore, according to an embodiment, it may be provided in this regard that the respective upper end section is connected in a material-locking manner to an upper side of the web adjacent to the core tube, in particular by means of a welded connection. This can easily be carried out from above.

Furthermore, according to one embodiment of the invention, it is provided that at least one pipe section, in particular at least two pipe sections, in particular at least three pipe sections of one or more pipes of a pipe layer of the pipe bundle are arranged between two tension elements adjacent in the direction of the longitudinal axis.

Further details and advantages of the invention will be explained by the following description of an embodiment with reference to the figures.

• 1 eine ausschnitthafte Schnittansicht eines erfindungsgemäßen Wärmeübertragers mit über Zugelementen miteinander verbundenen Stegen;
• 2 eine teilweise geschnittene Ansicht eines erfindungsgemäßen Wärmeübertragers zur Verdeutlichung der Anordnung der Stege bezüglich der Rohrlagen des Rohrbündels des Wärmeübertragers;

Show it:

• 1 a sectional sectional view of a heat exchanger according to the invention with interconnected via tension elements webs;
• 2 a partially sectioned view of a heat exchanger according to the invention to illustrate the arrangement of the webs with respect to the tube layers of the tube bundle of the heat exchanger;

The 1 shows in connection with the 2 a wound heat exchanger according to the invention 1 ,

The heat exchanger 1 has a tube bundle 3 on, the example in the 1 in 1 in a radially symmetric or in the 2 is shown in a perspective and partially sectioned view.

The tube bundle 3 has several tubes 30 for receiving at least a first fluid medium M on, with the pipes 30 according to 2 each helically on a core tube 300 of the heat exchanger 1 are wound, which extends along a longitudinal axis z, so that the tube bundle 3 several pipe layers 4a . 4 which is in a radial direction R of the tube bundle 3 are arranged one above the other. The respective radial direction R stands perpendicular to the longitudinal axis z and points away from it or to the outside.

According to 2 is the tube bundle 3 from a particular cylindrical shaped jacket 5 surrounded by a mantle room 6 limited, in which the tube bundle 3 together with the core tube 300 is arranged. In the mantle room 6 is for example via a connection 52 a second medium M ' can be introduced as well as via another nozzle 53 from the mantle room 6 removable, so that at least a first medium M as well as the second medium M ' can exchange heat indirectly with each other. There is a possibility of the pipes 30 into several tube groups to divide (in the 2 For example, three tube groups are shown), for example, with different first media M can be charged. For introducing the at least one first medium M in the pipes 30 of the tube bundle 30 has the heat exchanger 1 at least one nozzle 50 on. About at least one other nozzle 51 This can be at least a first medium M back out of the tube bundle 3 subtracted from. Furthermore, the tube bundle 3 of a cylindrical shirt 7 be surrounded, which serves a bypass flow in the mantle space 6 at the tube bundle 3 to suppress over.

Like in the 1 is further shown, is between an innermost layer of pipes 4a of the tube bundle 3 and the core tube 300 as well as between two adjacent pipe layers 4 of the tube bundle 3 a particular constant plurality of webs 10 provided, with the webs 10 each extend along the longitudinal axis z (see. 2 ) and in the radial direction R are arranged one above the other.

In this case, the respective bridge 10 according to 1 a top 10a on, from the core tube 300 points away, as well as a top side facing away from the top 10b that the core tube 300 respectively facing. At the top 10a the respective web 10 is a plurality of concave recesses 10c provided, in particular along the respective web 10 Are arranged equidistant from each other, wherein in the respective recess 10c one pipe section each 30a a wound tube 30 one at the top 10a adjacent or resting pipe layer 4 is arranged. Here is the respective pipe section 30a in the radial direction R of the tube bundle 3 preferably from its recess 10c out. Furthermore, two are each in the radial direction R adjacent or stacked webs 10 over in the radial direction R running tension elements 40 connected to each other on both adjacent bridges 10 are set so that the respective bridge 10 not with respect to the respective tension element 40 or the respective at the footbridge 10 fixed end portion 40a . 40b of the relevant tension element 40 can slide in the direction of the longitudinal axis z. Preferably, the tension elements 40 with their end sections 40a . 40 each firmly on the associated webs 10 clamped or respectively rigid with the two adjacent webs 10 connected.

As a result, it is advantageously prevented that the tube bundle 3 when winding up the pipes 30 on the core tube 300 , where the core tube 300 is arranged horizontally and is rotated about its longitudinal axis z, bulging downwards, which is detrimental to the pipes 30 can affect. At the same time the tube bundle gets 3 through the tension elements 40 in the axial direction, ie, along the longitudinal axis z a certain flexibility, so that the tube bundle 3 can compensate for thermally induced stresses or deformations during operation.

The individual tension elements are preferred 40 cylindrically shaped. Here, one can speak of a cylindrical shape, if at least one between two mutually facing surfaces of the webs 10 extending portion of the tension element 40 is cylindrical.

Around the tube bundle 3 To protect as well as possible during winding, the webs extend 10 (along with the recesses 10c for receiving the tubes 39) over the entire length of the tube bundle in the direction of the longitudinal axis z. There are two in the radial direction R adjacent footbridges 10 preferably also over its entire length along the longitudinal axis z in particular regular intervals over tension elements 40 connected with each other.

As in particular from the 1 can be seen, it is provided that the respective pipe section 30a a pipe 30 a pipe layer 4a . 4 in the radial direction R of the tube bundle 3 with more than half of its tube cross section from the associated recess 10c protrudes, ie, more than half the diameter D of the respective tube 30 or pipe cut 30a is (in the radial direction R ) outside the respective recess 10c arranged.

The respective tension elements 40 preferably protrudes from an associated section 10d the surface 10a of the respective bridge 10 in the radial direction R from, with each section 10d between two adjacent recesses 10c of the bridge in question 10 extends.

Here is the respective tension element 40 rigid over a lower end section 40b with the respective bridge 10 or the respective section 10d from which it is in the radial direction R protrudes, connected. Such a fixed clamping can be effected by a cohesive connection, in particular welded connection, or by a frictional connection (in particular screw connection).

In particular, the tension elements 40 already with the sections 10d be cohesively connected or integrally formed therewith.

Furthermore, the respective tension element 40 with an upper end portion 40a preferred rigid with the in the radial direction R adjacent jetty 10 connected. Here, too, is therefore preferably a fixed clamping of the respective tension element 40 in front. In this case, for example, the respective upper end portion 40a in a through hole 10e of the radial direction R neighboring jetty 10 be introduced, wherein the respective upper end portion 40a then preferably cohesively with the core tube 300 facing away from the top 10a in the radial direction R neighboring jetty 10 is connected, in particular by means of a welded joint V ,

Such a connection V can when winding the pipes 30 easy to run. For this purpose, the respective bridge 10 while winding the pipes 30 above the bridge below 10 positioned, with the projecting tension elements 40 of the lower bridge 10 in the through holes 10e of the upper bridge 10 be introduced. Then can from above the respective weld V be executed.

The number of tension elements 40 per pipe layer 4a . 4 Can attach to the weight of the pipes 30 or of the tube bundle 3 be adjusted.

It is preferably provided that between two in the direction of the longitudinal axis z adjacent tension elements 40 at least one pipe section 30a , in particular at least two pipe sections 30a , in particular at least three pipe sections 30a one or more pipes 30 a pipe layer 4 . 4a of the tube bundle 3 are arranged.

LIST OF REFERENCE NUMBERS

1

Heat exchanger

3

tube bundle

4a

Innermost pipe layer

4

pipe layer

5

coat

6

shell space

7

shirt

10

web

10a

top

10b

bottom

10c

recess

10d

section

10e

Through opening

30

Tube

30a

pipe section

40

tension element

40a

Upper end section

40b

Lower end section

50, 51, 52, 53

Support

300

core tube

D

diameter

M

first medium

M '

second medium

R

Radial direction

V

welded joint

Z

longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2613745 [0006]

Claims (12)

Heat exchanger (1), comprising - a tube bundle (3) comprising a plurality of tubes (30) for receiving a fluid medium (M), the tubes (30) each helically wound on a core tube (300) of the heat exchanger (1), the extends along a longitudinal axis (z), so that the tube bundle (3) has a plurality of tube layers (4a, 4) which are arranged one above the other in a radial direction (R) of the tube bundle (3), wherein between an innermost tube layer (4a ) and the core tube (300) and between each two adjacent tube layers (4) a plurality of webs (10) is provided, wherein the webs (10) respectively along the longitudinal axis (z) extend, and wherein - the respective web (10 ) has a top side (10a) with a multiplicity of concave recesses (10c), wherein in the respective recess (10c) a tube section (30a) of a tube (30) of a tube layer (4a, 4) of the tube adjoining the top side (10a) Tube bundle (3) is arranged, characterized in that each two in radial direction (R) adjacent webs (10) via in the radial direction (R) extending tension elements (40) are interconnected, which are respectively fixed to both adjacent webs (10) so that a sliding of the respective web (10) with respect respective tension element (40) in the direction of the longitudinal axis (z) of the tube bundle (3) is prevented. Heat exchanger according to one of the preceding claims, characterized in that the respective tension element (40) is in each case non-positively and / or materially and / or positively connected to the two adjacent webs (10). Heat exchanger according to one of the preceding claims, characterized in that the tension elements (40) are cylindrical. Heat exchanger according to one of the preceding claims, characterized in that the tension elements (40) in the direction of the longitudinal axis (z) are elastically bendable, so that the tube bundle (3) in the direction of the longitudinal axis (z) is flexible. Heat exchanger according to one of the preceding claims, characterized in that the webs (10) extend in the direction of the longitudinal axis (z) over the entire length of the tube bundle (3). Heat exchanger according to one of the preceding claims, characterized in that the respective pipe section (30a) in the radial direction (R) from the associated recess (10c) protrudes, wherein preferably the respective pipe section (30a) in the radial direction (R) of the tube bundle (3) projects out of the associated recess (10c) with more than half of its tube cross-section. Heat exchanger according to one of the preceding claims, characterized in that the tension elements (40) in each case between two recesses (10c) from the top (10a) of the respective web (10) in the radial direction (R) protrude. Heat exchanger after Claim 6 , characterized in that the tension elements (40) are rigidly connected to the upper side (10) from which they respectively protrude in the radial direction (R) of the tube bundle (3). Heat exchanger according to one of the preceding claims, characterized in that the tension elements (40) each with an upper end portion (40a) are rigidly connected to the in the radial direction (R) adjacent web (10). Heat exchanger after Claim 9 , characterized in that the respective upper end portion (40a) in a through hole (10e) of the radial direction (R) adjacent the web (10) is inserted. Heat exchanger after Claim 9 or 10 , characterized in that the respective upper end portion (40a) is materially connected to a core tube (300) facing away from top (10a) of the radial direction (R) adjacent web (10), in particular by means of a welded connection. Heat exchanger according to one of the preceding claims, characterized in that between two in the direction of the longitudinal axis (z) adjacent tension elements (40) at least one pipe section (30a), in particular at least two pipe sections (30a), in particular at least three pipe sections (30a) of a tube (30a) 30) of a tube layer (4, 4a) of the tube bundle (3) are arranged.

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