EP3128278A1 - Feeding and removal of pipe streams with interim temperature in coiled heat exchangers - Google Patents

Abstract

The invention relates to a wound heat exchanger (1) for indirect heat transfer between a first and a second fluid, with a jacket (10) surrounding a jacket space (M) for receiving the first fluid and extending along a longitudinal axis (L) in the shell extending core tube (21) extending along the longitudinal axis (L), a shell arranged in the shell space (2) comprising a plurality of tubes (20) for receiving the second fluid, in a along the longitudinal axis (L) extending winding region ( W) helically around the core tube (21) from a lower coil end (E) to an upper coil end (E '). According to the invention, the heat exchanger (1) has at least one tube (200) which is wound around the core tube (21) only in a section (A) of the winding region (W), wherein the at least one tube (200) runs along the Longitudinal axis (L) below the portion (A) as a straight tube (200a) extends to the lower winding end (E) and / or wherein the at least one tube along the longitudinal axis (L) above the portion (A) as a straight tube (200b ) extends to the upper coil end (E ').

Description

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

Such a heat exchanger has a pressure-bearing jacket, which surrounds a jacket space for accommodating a first fluid and extends along a longitudinal axis, and a core tube extending in the jacket, which extends along the longitudinal axis, which, in particular, along along with a heat exchanger arranged as intended the vertical runs. The heat exchanger further comprises a tube bundle arranged in the jacket space, which has a plurality of tubes and serves for receiving the second fluid (or a plurality of fluids), wherein these tubes helically extend in a winding region running along the longitudinal axis, starting from a lower winding end to an upper winding end the core tube are wound.

In such prior art heat exchangers, all tubes are wound throughout the length of the bundle, i.e., over said winding area. This has the consequence that all tube streams at the respective bundle end (or at the beginning of the bundle) have almost the same temperature.

If one now requires one of several tube streams, which is to have a temperature at the inlet or outlet which lies between the bundle inlet temperature and the bundle outlet temperature, the bundle must be divided into at least two bundles. The bundles are separated on the levels at which the desired temperatures prevail. When a tube bundle is split in this way, two separate shorter bundles are calculated. The corresponding medium, which has not yet reached its predefined end temperature, is then passed from one bundle to the separate other bundle, eg via a connecting pipeline. The medium which has its defined final temperature at the separation point is removed from the apparatus at the separation point. The individual bundles can also be installed in different apparatuses.

On this basis, the present invention is based on the problem to provide a heat exchanger of the type mentioned, in which the temperature of a pipe flow can be influenced in a relatively simple manner.

This problem is solved by a heat exchanger with the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and are described below.

Thereafter, it is provided that the heat exchanger has at least one tube which is wound only in a portion of the winding area around the core tube or about the longitudinal axis, wherein the at least one tube along the longitudinal axis below the section as a straight tube to the lower end of the coil and / or wherein the at least one tube extends along the longitudinal axis above the portion as a straight tube to the upper coil end.

Preferably, the wound heat exchanger is further characterized in that the tubes of the tube bundle are wound on the core tube such that the core tube carries the load of the tubes of the tube bundle. The tubes may be wound in multiple layers on the core tube, wherein spacers may be provided between the individual layers.

The tube bundle can furthermore have a plurality of tube groups, the tubes having a tube group via a common inlet or outlet. have, so that the tubes of a tube group are fed with a flow of material, which is divisible or distributed to the individual tubes of the tube group.

That is to say, the at least one tube or the corresponding tube flow is helically wound around the core tube or around the longitudinal axis only in the named section and only appreciably participates in the heat transfer there, whereby it under- and / or above the section tube sections has, which run straight along the longitudinal axis or along the core tube and therefore hardly involved in the heat exchange compared to the wound part of the at least one tube. The said pipe sections may be formed integrally with the wound part or may otherwise be fluidly connected to the wound part.

This means that the tube bundles of the heat exchanger do not have to be split, but that the at least one tube stream is wound only in the said section in which the desired temperatures prevail and before and / or thereafter passed as a straight tube to the respective coil end and thus no longer significantly participates in the heat exchange in this area, since the heat transfer surface of the straight or the pipe sections relative to the wound part is negligible.

A straight course of a pipe / pipe section is understood in particular to mean a linear course of the pipe or pipe section. However, according to one embodiment, a straight course in the sense of the present invention is also present if the course in question has one or more bends, but the relevant tube section is involved in the heat exchange in a significantly lesser extent compared to the wound part in said section. Such a course of a pipe section is e.g. given when the relevant pipe section extends at least in sections along or parallel to the longitudinal axis and / or is wound over its entire length along the longitudinal axis less than 180 ° to the core tube or the longitudinal axis of the heat exchanger.

According to a preferred embodiment of the invention, it is provided that the section is selected and positioned along the longitudinal axis, that at a proper operation of the heat exchanger desired intermediate temperatures in the section are present, which are smaller than a prevailing at the lower end of the coil temperature and / or greater are considered to be at the upper coil end temperature.

According to a further embodiment of the invention it is provided that the heat exchanger has a plurality of tubes which are wound only in a portion of the winding area around the core tube or the longitudinal axis, said tubes along the longitudinal axis below the portion as straight tubes to the lower coil end run and / or wherein these tubes extend along the longitudinal axis above the portion as straight tubes to the upper coil end. In particular, these multiple tubes can be wound in several layers around the core tube or the longitudinal axis.

According to a further embodiment, the plurality of tubes of said tube bundle can be wound in several layers around the core tube or the longitudinal axis.

The heat exchanger according to the invention is preferably used for carrying out an indirect heat exchange between a refrigerant flow as a first fluid and a hydrocarbon-containing stream as a second fluid, wherein in particular the hydrocarbon-containing stream is formed by natural gas. However, the heat exchanger according to the invention can be used with all imaginable streams.

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

Fig. 1

eine ausschnitthafte Schnittansicht eines erfindungsgemäßen Wärmeübertragers; und

Fig. 2

eine schematische Darstellung eines erfindungsgemäßen Wärmeübertragers.

Show it:

Fig. 1

a sectional sectional view of a heat exchanger according to the invention; and

Fig. 2

a schematic representation of a heat exchanger according to the invention.

FIG. 1 shows in connection with FIG. 2 a heat exchanger 1 according to the invention, which is characterized in that it comprises a tube bundle 2 with at least one tube 200 (see, in particular Fig. 2 ), which is not wound over the entire bundle length along a longitudinal axis L or along a core tube 21 of the heat exchanger 1 around the core tube 21, but only in a portion A of the entire winding area W. Outside this section A, the tube 200 pipe sections 200a, 200b, which extend substantially straight, in particular linear, along the longitudinal axis L or along the core tube 21. Thus, the wound part of the tube 200 in section A is exposed only to pre-definable, desired temperatures and does not significantly participate in the heat exchange due to its straight course outside the section A.

The pipe sections 200a, 200b may be integrally formed on the wound section A or otherwise fluidly connected to the wound section.

The heat exchanger according to FIGS. 1 and 2 each have a core tube 21, on which the tubes 20, 200 of the tube bundle 20 are wound, so that in particular the core tube 21 carries the load of the tubes 20, 200. However, the invention is also applicable to wound heat exchanger without core tube.

In detail, the heat exchanger 1 is designed for the indirect heat transfer between a first and a second fluid and has a jacket 10 which surrounds a jacket space M for receiving the first fluid, which can be introduced into the jacket space M via an inlet connection 101 on the jacket 10 a corresponding outlet port 102 on the jacket 10 again from the shell space M is removable.

The jacket 10 extends along the said longitudinal axis L, which preferably extends along the vertical with respect to a heat exchanger 1 arranged as intended. In the shell space M, the tube bundle 2 is further arranged with a plurality of tubes 20 for receiving the second fluid. These tubes 20 are helically wound around a core tube 21 in a winding region W extending along the longitudinal axis L from a lower coil end E to an upper coil end E 'in multiple layers 22, the core tube 21 also extending along the longitudinal axis L. and concentric in the shell space M is arranged. Several tubes 20 of the tube bundle 2 can each form a tube group (in the FIG. 1 three such tube groups are shown), wherein the tubes of a tube group can be summarized in an associated tube plate 104, wherein the second fluid introduced via inlet ports 103 on the shell 10 in the tubes 20 of the respective tube group and via discharge nozzle 105 from the tubes 20 of the corresponding tube group can be deducted. Thus, heat can be transferred indirectly between the two fluids, which are preferably conducted in countercurrent through the heat exchanger 1.

According to the invention, the heat exchanger 1 or its tube bundle 2, as from Fig. 2 can be seen, at least one tube 200, which only in a section A of Winding portion W is wound around the core tube 21 (or the longitudinal axis L), wherein in this section A prevail those temperatures that are desired for the heat exchange of the guided in the pipe 200 stream. These temperatures may be selected by location of the portion A along the longitudinal axis L relative to the winding area W and by selecting the extent of the portion A along the longitudinal axis L.

In the present case, the tube bundle 2 or a material flow guided therein has an inlet side according to FIG FIG. 2 at the bottom winding end E an inlet temperature T _e and the upper winding end E ', an output temperature T _E' on.

Below the section A and / or above the section A, the at least one pipe 200 pipe sections 200a and 200b, which extend substantially straight or linearly to the lower or upper winding end E, E 'and from there to an associated inlet port 103 and outlet pipe 105 are guided.

Accordingly, at the lower transition to the section A or at the upper transition from the section A to the pipe section 200b, the desired temperatures T _A and T _{A '} prevail. Since the pipe sections 200a and 200b do not substantially participate in the heat transfer, prevails at the respective end of the pipe section 200a or 200b, ie, at the winding end E and E ', respectively, with a temperature T _A and T _A' comparable temperature.

The jacket 10 and the core tube 21 can furthermore be of cylindrical design, at least in sections, so that the longitudinal axis L forms a cylinder axis of the jacket 10 and of the concentric core tube 21 extending therein. Furthermore, a shirt 3 can be arranged in the jacket space M, which encloses the tube bundle 2 or the at least one tube 200, so that a space 4 surrounding the tube bundle 2 or tube 200 is formed between the tube bundle 2 and that shirt 3. The shirt 3 serves to suppress as far as possible a bypass flow of the first fluid guided in the jacket space M, with which the tube bundle 2 / tube 200 is acted upon, on the tube bundle 2 / tube 200. The first fluid is thus preferably guided in the jacket space M in the region of the jacket space M surrounded by the shirt 3.

Furthermore, the individual pipe layers 22 (in particular in the case of horizontal support of the tube bundle 2) can be supported on spacer elements 6 extending along the longitudinal axis L and on the core tube 21 in each case, wherein a plurality of spacer elements 6 can be arranged one above the other in the radial direction R of the tube bundle 2. <B> LIST OF REFERENCES </ b> 1 Heat exchanger 2 tube bundle 3 shirt 4 gap 6 spacers 10 coat 20 Tube 21 core tube 22 pipe layers 101 inlet port 102 outlet 103 inlet port 104 tube sheet 105 outlet 200 pipe 200a pipe section 200b pipe section A section e Lower coil end e ' Upper coil end R radial direction L longitudinal axis M shell space W winding region T _A , T _{A '} , T _E , T _E' temperatures

Claims (6)

Coiled heat exchanger for indirect heat transfer between a first and a second fluid, with a jacket (10) surrounding a jacket space (M) for receiving the first fluid and extending along a longitudinal axis (L), - A tube bundle arranged in the shell (2) comprising a plurality of tubes (20) for receiving the second fluid, in a along the longitudinal axis (L) extending winding region (W) from a lower winding end (E) to an upper winding end (E ') helically wound around the longitudinal axis (L), characterized,
in that the heat exchanger (1) has at least one tube (200) which is wound around the longitudinal axis (L) only in a section (A) of the winding region (W), the at least one tube (200) being arranged along the longitudinal axis (L). extending below the section (A) as a straight tube (200a) to the lower coil end (E) and / or wherein the at least one tube along the longitudinal axis (L) above the section (A) as a straight tube (200b) up to the upper coil end (E ') runs. Heat exchanger according to claim 1, characterized in that the heat exchanger has a core tube (21) extending in the jacket, which extends along the longitudinal axis (L), the tubes (20) in the winding region (W) extending along the longitudinal axis (L). from the lower coil end (E) to the upper coil end (E ') are helically wound around the core tube (21). Heat exchanger according to claim 1 or 2, characterized in that the portion (A) is selected and positioned along the longitudinal axis (L), that in a normal operation of the heat exchanger (1) intermediate temperatures (T _{A '} -T _A ) in the section (A), which are smaller than a prevailing at the lower end of the coil (E) temperature (T _E ) and / or which are greater than one at the upper end of the coil (E ') prevailing temperature (T _E' ). Heat exchanger according to one of the preceding claims, characterized in that the heat exchanger (1) a plurality of tubes (200) which only in the portion (A) of the winding region (W) about the longitudinal axis (L) and / or around the core tube (21 ), wherein these tubes (200) extend along the longitudinal axis (L) below the section (A) as straight tubes (200a) to the lower coil end (E) and / or these tubes (200) along the longitudinal axis ( L) extend above section (A) as straight tubes (200b) to the upper coil end (E '). Heat exchanger according to claim 4, characterized in that these tubes (200) in several layers around the longitudinal axis (L) and / or around the core tube (21) are wound. Heat exchanger according to one of the preceding claims, characterized in that the tubes (20) of the tube bundle (2) in several layers around the longitudinal axis (L) and / or around the core tube (21) are wound.

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