阅读说明：本技术 一种适用于flng的正弦波纹管型绕管式换热器 (Sine wave corrugated pipe type wound pipe type heat exchanger suitable for FLNG ) 是由 李玉星 孙崇正 韩辉 朱建鲁 刘翠伟 刘亮 王国聪 周慧 于 2020-05-27 设计创作，主要内容包括：本发明涉及一种适用于FLNG的正弦波纹管型绕管式换热器,外筒的顶部为壳侧冷剂进口,底部为壳侧冷剂出口,壳侧冷剂进口的下方设置正弦波纹管式布液器,外筒的内部设置第一正弦波纹缠绕管束、第二正弦波纹管束,正弦波纹管束为正弦波形状的换热管,第一正弦波纹缠绕管束和第二正弦波纹管束自上而下波峰和波谷一一交错对应。正弦波纹管式布液器从上到下依次为一分二型管、二分四型管、两个正弦波纹管式布液管。提高了恶劣海况下FLNG绕管式换热器布液器布液能力、管侧天然气及冷剂的换热性能和壳侧冷剂降膜流动流型稳定性。(The invention relates to a sine-wave corrugated pipe type wound pipe heat exchanger suitable for FLNG (flash refrigerant gas recovery), wherein the top of an outer cylinder is a shell-side refrigerant inlet, the bottom of the outer cylinder is a shell-side refrigerant outlet, a sine-wave corrugated pipe liquid distributor is arranged below the shell-side refrigerant inlet, a first sine-wave corrugated winding pipe bundle and a second sine-wave corrugated pipe bundle are arranged in the outer cylinder, the sine-wave corrugated pipe bundles are sine-wave heat exchange pipes, and the wave crests and the wave troughs of the first sine-wave corrugated pipe bundle and the second sine-wave corrugated pipe bundle correspond to each other in a. The sine corrugated pipe type liquid distributor is sequentially provided with a one-to-two pipe, a two-to-four pipe and two sine corrugated pipe type liquid distribution pipes from top to bottom. The liquid distribution capacity of the FLNG liquid distributor of the tube type heat exchanger, the heat exchange performance of natural gas and refrigerant on the tube side and the stability of the flow pattern of falling film flow of the refrigerant on the shell side under severe sea conditions are improved.)

1. The utility model provides a pipe heat exchanger is wound to sine wave bellows type which is applicable to FLNG which characterized in that: the top of urceolus is the import of shell side cryogen, and the bottom is the export of shell side cryogen, and the below of shell side cryogen import sets up sinusoidal corrugated tube formula liquid distributor, and the inside of urceolus sets up fore-and-aft sinusoidal corrugated tube bank, is first sinusoidal ripple winding tube bank, second sinusoidal corrugated tube bank respectively, and sinusoidal corrugated tube bank is the heat exchange tube of sine wave shape, and first sinusoidal ripple winding tube bank and second sinusoidal corrugated tube bank top-down crest and trough one-to-one staggered correspondence.

2. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 1 wherein: the diameter range of the wave crest of the sine wave winding tube bundle is 8mm to 14mm, the diameter range of the wave trough is 6mm to 12mm, the diameter difference range of the wave crest and the wave trough is 1.5mm to 2.5mm, and the axial distance between the adjacent wave crest and the adjacent wave trough is 4-8 mm.

3. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 1 wherein: the upper end and the lower end of the first sine wave winding tube bundle are respectively connected with the side wall of the outer barrel, the top opening is a tube side refrigerant outlet, and the bottom opening is a tube side refrigerant inlet.

4. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 3 wherein: the upper end and the lower end of the second sine corrugated pipe bundle are respectively connected with the side wall of the outer barrel, the top opening is a natural gas outlet, and the bottom opening is a natural gas inlet.

5. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 1 wherein: the inside of urceolus sets up central barrel, and first sinusoidal ripple winding tube bank, the common winding of second sinusoidal ripple tube bank are at the surface of central barrel, and first sinusoidal ripple winding tube bank, the sinusoidal ripple tube bank of second are supported to central barrel.

6. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 1 wherein: sinusoidal bellows formula liquid distributor from the top down is one minute two type pipe in proper order, two minute four type pipes, two sinusoidal bellows formula liquid distribution pipe, one minute two type pipe is responsible for and a branch pipe vertical connection by one and is constituteed, it communicates with each other with shell side cryogen import to be responsible for, two minute four type pipes comprise two bleeder pipes and four distribution branch pipes, two bleeder pipes communicate with the both ends of branch pipe respectively, two distribution branch pipes communicate with the both ends of a bleeder pipe respectively, two sinusoidal bellows formula liquid distribution pipe are the ring type structure respectively, the both ends of four distribution branch pipes are connected with two sinusoidal bellows formula liquid distribution pipe respectively.

7. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 6 wherein: the side wall of the sine corrugated pipe type liquid distribution pipe is of a sine wave structure, and a spray opening is arranged at the wave crest at the bottom of the sine corrugated pipe type liquid distribution pipe.

8. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 6 wherein: two sinusoidal bellows formula liquid distribution pipes divide into first sinusoidal bellows formula liquid distribution pipe and the sinusoidal bellows formula liquid distribution pipe of second, and the diameter of first sinusoidal bellows formula liquid distribution pipe is less than the diameter of the sinusoidal bellows formula liquid distribution pipe of second, and first sinusoidal bellows formula liquid distribution pipe is located the inboard of the sinusoidal bellows formula liquid distribution pipe of second, and the distribution branch pipe is located between two sinusoidal bellows formula liquid distribution pipes, both ends respectively with two sinusoidal bellows formula liquid distribution pipe intercommunications.

9. A sine wave corrugated tube wound tube heat exchanger suitable for FLNG as claimed in claim 1 wherein: the positions of the wave crests and the wave troughs of the first sine corrugated winding tube bundle and the second sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom, the positions of the wave crests and the wave troughs of the first sine corrugated winding tube bundle are positioned outside the positions of the wave crests and the wave troughs of the second sine corrugated tube bundle, the positions of the wave crests and the wave troughs of the first sine corrugated tube bundle and the first sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom, and the positions of the wave crests and the wave troughs of the second sine corrugated tube bundle and the second sine corrugated tube bundle are in one-to-.

10. Use of a sine-corrugated coiled pipe heat exchanger suitable for FLNG according to any of claims 1-9 in a floating production unit.

Technical Field

The invention relates to the technical field of heat exchanger enhanced heat exchange, in particular to a structure optimization of a wound tube type heat exchanger applied to a liquefied natural gas floating production storage and unloading device (FLNG).

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

FLNG is a novel floating production device developed for offshore natural gas fields, and has the functions of natural gas exploitation, pretreatment, liquefaction and the like. Meanwhile, the FLNG breaks through the limit of economy and cost of a long-distance pipeline and a land production system, and is suitable for developing medium and small-sized deep-sea gas fields. Currently, there are up to 21 FLNG devices in the design, construction and commissioning phases of the world. When the coiled tube type heat exchanger is applied to the offshore FLNG, the coiled tube type heat exchanger is influenced by severe sea condition conditions, the phenomena of uneven liquid distribution of a liquid distributor, bias flow of shell side fluid and the like exist, the stability of a falling film flowing liquid film of an external refrigerant is damaged, the effective heat exchange area of a coil is reduced, the heat exchange performance of the coiled tube type heat exchanger is deteriorated, and the overall performance index of the FLNG liquefaction process is further influenced.

Disclosure of Invention

In view of the problems in the prior art, the invention aims to provide a sine-wave corrugated tube type wound tube heat exchanger suitable for FLNG, which is optimized from three aspects of the structure of a liquid distributor, the tube type of a wound tube bundle and the longitudinal arrangement mode, and improves the offshore adaptability of the wound tube heat exchanger. The device has the advantages of strong offshore adaptability, stable refrigerant flow, compact structure, small occupied area, high heat exchange efficiency and the like.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides a sine wave bellows type is around tubular heat exchanger suitable for FLNG, the top of urceolus is the import of shell side cryogen, the bottom is the export of shell side cryogen, the below of shell side cryogen import sets up sine bellows formula liquid distributor, the inside of urceolus sets up fore-and-aft sine bellows tube bank, be first sine bellows winding tube bank, second sine bellows tube bank respectively, sine bellows tube bank is the heat exchange tube of sine wave shape, first sine bellows winding tube bank and second sine bellows tube bank top-down crest and trough staggered correspondence one by one.

The invention solves the problem that the heat exchange performance of the coiled pipe type heat exchanger in the floating production device is reduced due to the severe offshore environment. The heat exchanger has good offshore adaptability, and the influence degree of the heat exchange performance by the severe offshore conditions is small. The staggered arrangement is that the wave crests and the wave troughs of the two sine corrugated pipe bundles are staggered up and down.

First sinusoidal ripple winding tube bank and the setting of second sinusoidal ripple tube bank alternately, the crest of first sinusoidal ripple winding tube bank and the trough of second sinusoidal ripple tube bank correspond from top to bottom, and the trough of first sinusoidal ripple winding tube bank and the crest of second sinusoidal ripple tube bank correspond from top to bottom.

As a further technical scheme, the diameter range of the wave crest of the sine wave winding tube bundle is 8mm to 14mm, the diameter range of the wave trough is 6mm to 12mm, the diameter difference range of the wave crest and the wave trough is 1.5mm to 2.5mm, and the axial distance between the adjacent wave crest and the adjacent wave trough is 4-8 mm. The fluidity is better in the range of the diameter difference of the wave crest and the wave trough.

One wave crest and one wave trough of the sine wave winding tube bundle are adjacent, the axial distance between the wave crests and the wave troughs is 4-8mm, and the axial distance is in the direction of a vertical shaft of the outer barrel.

As a further technical scheme, the upper end and the lower end of the first sine wave winding tube bundle are respectively connected with the side wall of the outer barrel, the top opening is a tube side refrigerant outlet, and the bottom opening is a tube side refrigerant inlet.

As a further technical scheme, the upper end and the lower end of the second sine corrugated pipe bundle are respectively connected with the side wall of the outer barrel, the top opening is a natural gas outlet, and the bottom opening is a natural gas inlet.

As a further technical scheme, the inside of urceolus sets up central barrel, and first sinusoidal ripple winding tube bank, the surface of second sinusoidal ripple tube bank winding at central barrel jointly, and first sinusoidal ripple winding tube bank, the second sinusoidal ripple tube bank are supported to central barrel.

As a further technical scheme, the sine corrugated pipe type liquid distributor is sequentially provided with a one-to-two pipe, a two-to-four pipe and two sine corrugated pipe type liquid distribution pipes from top to bottom, the one-to-two pipe is formed by vertically connecting a main pipe and a branch pipe, the main pipe is communicated with a shell side refrigerant inlet, the two-to-four pipe is formed by two branch pipes and four distribution branch pipes, the two branch pipes are respectively communicated with two ends of the branch pipe, the two distribution branch pipes are respectively communicated with two ends of one branch pipe, the two sine corrugated pipe type liquid distribution pipes are respectively of a ring-shaped structure, and two ends of the four distribution branch pipes are respectively connected with the two sine corrugated pipe type liquid distribution.

As a further technical scheme, the side wall of the sine corrugated pipe type liquid distribution pipe is of a sine wave type structure, and a spray opening is formed in the wave crest at the bottom of the sine corrugated pipe type liquid distribution pipe.

As a further technical scheme, two sinusoidal bellows formula liquid distribution pipes divide into first sinusoidal bellows formula liquid distribution pipe and second sinusoidal bellows formula liquid distribution pipe, and the diameter of first sinusoidal bellows formula liquid distribution pipe is less than the diameter of second sinusoidal bellows formula liquid distribution pipe, and first sinusoidal bellows formula liquid distribution pipe is located the inboard of second sinusoidal bellows formula liquid distribution pipe, and the distribution branch pipe is located between two sinusoidal bellows formula liquid distribution pipes, both ends respectively with two sinusoidal bellows formula liquid distribution pipe intercommunication.

As a further technical scheme, the positions of the wave crests and the wave troughs of the first sine corrugated winding tube bundle and the second sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom, the positions of the wave crests and the wave troughs of the first sine corrugated tube bundle and the first sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom, and the positions of the wave crests and the wave troughs of the second sine corrugated tube bundle and the second sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom.

The application of the sine bellows type pipe-wound heat exchanger in a floating production device.

The invention has the beneficial effects that:

1. compared with the traditional wound tube type heat exchanger, the wound tube type heat exchanger is optimized from three aspects of the structure of the liquid distributor, the tube type of the wound tube bundle and the longitudinal arrangement mode. The liquid distribution capacity of the FLNG liquid distributor of the tube type heat exchanger, the heat exchange performance of natural gas and refrigerant on the tube side and the stability of the flow pattern of falling film flow of the refrigerant on the shell side under severe sea conditions are improved.

2. Compared with a wound tube type heat exchanger adopting a traditional round tube, the sine-wave-pattern wound tube bundle adopted by the invention can improve the heat exchange capacity of natural gas and refrigerant on the tube side of the wound tube type heat exchanger by 10-120%. Under the same natural gas treatment capacity, the adopted sine wave pattern winding tube bundle can reduce the heat exchange area of the winding tube type heat exchanger, so that the heat exchanger is more compact, and the whole occupied area of the FLNG liquefaction process is further saved.

3. The liquid distributing capacity of the liquid distributor in the FLNG coiled tube heat exchanger under severe sea conditions is greatly improved due to the fact that liquid is easy to gather at the wave crest at the bottom of the sine bellows type liquid distributor, and further the flowing stability of a shell side refrigerant of the FLNG coiled tube heat exchanger is improved.

4. The sine wave pattern winding pipe bundle adopted by the invention can greatly reduce the phenomenon of shell side refrigerant deviation caused by the oscillation of the wound pipe type heat exchanger due to the upper and lower fluctuation forms (wave crest and wave trough) of the sine wave pattern, thereby effectively inhibiting the influence of severe sea conditions on the stability of the shell side flowing pattern of the wound pipe type heat exchanger.

5. Three flow patterns can appear in the falling film flow around the shell side of the tube heat exchanger outside the refrigerant tube: fan-like flow patterns, columnar flow patterns, and droplet-like flow patterns. The cold energy of the refrigerant under the fan-shaped flow type is excessive, the cold energy of the refrigerant under the drop-shaped flow type is insufficient, and the cold energy of the refrigerant can be fully utilized by the columnar flow type. Under severe sea conditions, the refrigerant on the shell side of the wound tube type heat exchanger adopting the traditional round tube deviates, a fan-shaped flow pattern area and a drop-shaped flow pattern area are easily formed, and the refrigerant on the shell side and the heat exchange area can not be effectively utilized. The spraying positions of the sine corrugated pipe type liquid distributor adopted by the invention correspond to the wave crests and the wave troughs of the winding pipe bundle in a one-to-one staggered manner from top to bottom. Because the falling film flowing liquid can be converged and dropped in the middle of the two liquid columns at the inlet, and the liquid is easy to converge at the wave crest at the bottom, the arrangement form of the alternative correspondence of the wave crests and the wave troughs of the coil pipe is favorable for improving the flowing stability of the medium at the shell side of the coiled pipe heat exchanger under severe sea conditions, the columnar flow pattern is easier to form, the cold quantity and the heat exchange area at the shell side of the FLNG coiled pipe heat exchanger can be fully utilized, and the marine adaptability of the FLNG coiled pipe heat exchanger is further improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is an overall block diagram of a sinusoidal bellows-type coiled tube heat exchanger suitable for FLNG;

FIG. 2 is a top view of a sinusoidal bellows-type liquid distributor;

FIG. 3 is a side view of a sinusoidal bellows-type liquid distributor;

the device comprises a shell side refrigerant inlet, a shell side refrigerant outlet, a tube side refrigerant outlet, a natural gas outlet, a first sine corrugated tube type liquid distribution pipe, a central cylinder 6, a tube side refrigerant inlet, a natural gas inlet, a shell side refrigerant outlet, a sine corrugated winding tube bundle 10, a second sine corrugated tube type liquid distribution pipe 11, a one-to-two type tube 12, a four-to-two type tube 13 and a liquid distribution communicating tube 14.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As introduced in the background art, when the coiled tube heat exchanger is applied to the FLNG at sea, the coiled tube heat exchanger is affected by severe sea conditions, the phenomena of uneven liquid distribution of a liquid distributor, bias flow of liquid on the shell side and the like can occur in the coiled tube heat exchanger, the uniform distribution of liquid films outside the tubes is damaged, the effective heat exchange area is reduced, the heat exchange performance of the coiled tube heat exchanger is deteriorated, and the overall performance index of the FLNG liquefaction process is further affected. In order to solve the technical problem, the application provides a sine-wave corrugated pipe type wound pipe type heat exchanger suitable for FLNG.

As shown in fig. 1, a first sine corrugated winding tube bundle and a second sine corrugated tube bundle are arranged inside an outer barrel of the sine-wave corrugated tube type wound tube heat exchanger, a shell-side refrigerant inlet 1 is arranged at the top of the outer barrel 2, a shell-side refrigerant outlet 9 is arranged at the bottom of the outer barrel, the sine corrugated tube bundle 10 is a sine-wave shaped heat exchange tube, and the first sine corrugated winding tube bundle and the second sine corrugated tube bundle are in one-to-one staggered correspondence from top to bottom to facilitate the shell-side refrigerant to completely fall from wave crests at the bottom of. Liquid is easy to gather at the wave crests at the bottom, the arrangement mode that the wave crests and the wave troughs correspond in a one-to-one staggered manner improves the stability of the shell-side flow pattern of the tube-wound heat exchanger under severe sea conditions, and the cold quantity and the heat exchange area of the shell side of the FLNG tube-wound heat exchanger can be fully utilized.

First sinusoidal ripple winding tube bank and the setting of second sinusoidal ripple tube bank alternately, the crest of first sinusoidal ripple winding tube bank and the trough of second sinusoidal ripple tube bank correspond from top to bottom, and the trough of first sinusoidal ripple winding tube bank and the crest of second sinusoidal ripple tube bank correspond from top to bottom.

The diameter range of the crest of the coil pipe is 8mm to 14mm, the diameter range of the trough of the coil pipe is 6mm to 12mm, the recommended diameter difference range of the crest and the trough of the coil pipe is 1.5mm to 2.5mm, and the axial distance between adjacent crests and troughs is 4-8 mm.

The upper end and the lower end of the first sine wave winding tube bundle are respectively connected with the side wall of the outer barrel, the top opening is a tube side refrigerant outlet 3, and the bottom opening is a tube side refrigerant inlet 7. The upper end and the lower end of the second sine corrugated pipe bundle are respectively connected with the side wall of the outer barrel, the top opening is a natural gas outlet 4, and the bottom opening is a natural gas inlet 8.

The sine wave-shaped winding pipe bundle 10 is wound on the central cylinder 6, and the central cylinder 6 plays a supporting role.

Sinusoidal bellows formula liquid distributor from the top down is one minute two type pipe 12 in proper order, two minute four type pipes 13, two sinusoidal bellows formula liquid distribution pipe, one minute two type pipe 12 is responsible for and a branch pipe vertical connection constitutes by one, be responsible for and shell side cryogen import 1 communicates with each other, two minute four type pipes 13 comprises two bleeder pipes and four distribution branch pipes, two bleeder pipes communicate with the both ends of branch pipe respectively, two distribution branch pipes communicate with the both ends of a bleeder pipe respectively, two sinusoidal bellows formula liquid distribution pipe are the ring type structure respectively, the both ends of four distribution branch pipes are connected with two sinusoidal bellows formula liquid distribution pipe respectively.

After being distributed by the one-division two-tube 12 and the two-division four-tube 13, the shell-side refrigerant respectively enters the first sinusoidal corrugated tube type liquid distribution pipe 5 and the second sinusoidal corrugated tube type liquid distribution pipe 11 through the liquid distribution communicating pipe 14. The shell side refrigerant is sprayed to the sine wave pattern winding tube bundle from the bottom peak orifices of the first sine corrugated tube type liquid distribution tube 5 and the second sine corrugated tube type liquid distribution tube 11.

The first sine corrugated pipe type liquid distribution pipe 5 is opposite to the wave crest and the wave trough of the first sine corrugated winding pipe bundle, and the second sine corrugated pipe type liquid distribution pipe 11 is opposite to the wave crest and the wave trough of the second sine corrugated pipe bundle. The wave crest and the wave trough of the second sine wave-shaped tube bundle are positioned at the inner sides of the wave crest and the wave trough of the first sine wave-shaped tube bundle, namely the wave crest and the wave trough of the first sine wave-shaped tube bundle are closer to the side wall of the outer cylinder. The spraying positions of the sine corrugated pipe type liquid distributor correspond to the wave crests and the wave troughs of the sine corrugated pipe type winding pipe bundle in a one-to-one staggered manner from top to bottom, so that the stability of the external falling film flowing pattern of the pipe type heat exchanger under sea conditions is improved.

When the device is operated, natural gas and pipe side refrigerant flow around the pipe bundle pipe side in a sine wave-shaped winding manner, spirally flow from bottom to top and absorb cold. The natural gas is liquefied in the sine-wave-pattern winding tube bundle, and the tube-side refrigerant flows out of the tube-wound heat exchanger and is throttled by the low-temperature throttle valve, and becomes shell-side refrigerant after being cooled and depressurized.

The sine bellows type liquid distributor uniformly distributes the refrigerant on the shell side, and the refrigerant flows out from the wave crest position at the bottom of the liquid distribution. The wave crest at the bottom of the sine corrugated pipe type liquid distributor is easy to collect the refrigerant, so that the liquid distribution capacity under severe sea conditions is greatly enhanced compared with the traditional circular pipe type liquid distributor. The shell side refrigerant flows in a falling film from top to bottom outside the sine wave pattern winding tube bundle to release cold energy.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.