CN218627907U

CN218627907U - Heat exchange tube structure for winding tube type heat exchanger

Info

Publication number: CN218627907U
Application number: CN202222987883.2U
Authority: CN
Inventors: 王宇; 崔娇月; 马慧丽; 徐伟栋; 朱常宝; 陶江
Original assignee: Zhenhai Petrochemical Construction And Installation Engineering Co ltd
Current assignee: Zhenhai Petrochemical Construction And Installation Engineering Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-03-14
Anticipated expiration: 2032-11-09

Abstract

A heat exchange tube structure for a winding tube type heat exchanger comprises a heat exchange tube body which is hollow inside and is provided with an outer peripheral wall, the length direction of the heat exchange tube body is a first axial direction, and the direction surrounding the first axial direction is a first circumferential direction; the outer peripheral wall of the heat exchange tube body is provided with a longitudinal groove extending along the first axial direction, the cross section of the longitudinal groove is in a V shape or an inverted trapezoid shape with a wide outer part and a narrow inner part, and the longitudinal grooves are arranged at intervals along the first circumferential direction; the periphery wall of heat exchange tube body still sets up along the above-mentioned annular groove that first circumference extends, the section of annular groove is outer wide interior narrow V-arrangement or falls trapezoidal, just the annular groove has a plurality ofly, along above-mentioned first axial interval arrangement to crisscross and form a plurality of alternately distributed's arch and pit mutually with above-mentioned vertical groove. Compared with the prior art, the utility model discloses can further promote the fluid disturbance effect.

Description

Heat exchange tube structure for winding tube type heat exchanger

Technical Field

The utility model belongs to the technical field of the heat exchanger, concretely relates to a heat exchange tube structure for twining tubular heat exchanger.

Background

The wound tube type heat exchanger is used as an efficient and energy-saving heat exchanger, has the advantages of high heat transfer coefficient, large heat exchange area per unit volume, good temperature difference resistance effect and the like, and is widely applied to the field of petrochemical industry.

The heat exchange tube in the winding tube type heat exchanger is a spiral winding structure, and specifically, the structure disclosed in the utility model patent with the patent number ZL201920621066.0 (a winding tube type heat exchanger for gas absorption) (the publication number is CN 210057825U), and the structure disclosed in the utility model patent with the patent number ZL202220538311.3 (a shell structure of a vertical heat exchanger and a heat exchanger with the shell structure) (the publication number is CN 217358213U).

The spiral winding heat exchange tube can obtain higher heat transfer coefficient in the tube, and has stronger anti-scaling capability and can avoid heat exchange dead zones due to the smooth peripheral wall of the heat exchange tube outside the tube. But also because the peripheral wall of the heat exchange tube is smooth, the disturbance to the shell-side medium (especially high-viscosity fluid) is lacked, so that the heat exchange efficiency is to be further improved.

Therefore, the utility model patent ZL 201822177008.1's utility model A composite high-efficiency heat exchange tube (No. CN 209416126U) discloses a composite high-efficiency heat exchange tube, including the tubulose base member, the surface of this base member is equipped with the helicla flute along the base member axial is concave, this helicla flute is protruding to be established and form the spiral arch at the base member internal surface in the base member is internal, still including a plurality of first bump, each first bump interval is protruding to be established on the internal surface of base member, and the pipeline section that the internal surface epirelief of base member was equipped with this first bump and the protruding pipeline section that is equipped with the spiral arch are the segmentation pipeline section. The patent can improve the disturbance of the fluid.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, a heat exchange tube structure for twining tubular heat exchanger is provided to can further promote the fluid disturbance effect.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a heat exchange tube structure for a wound tube heat exchanger, comprising:

the heat exchange tube body is hollow inside, is provided with an outer peripheral wall, and records the length direction of the heat exchange tube body as a first axial direction and the direction surrounding the first axial direction as a first circumferential direction;

the method is characterized in that:

the outer peripheral wall of the heat exchange tube body is provided with a longitudinal groove extending along the first axial direction, the cross section of the longitudinal groove is in a V shape or an inverted trapezoid shape with a wide outer part and a narrow inner part, and the longitudinal grooves are arranged at intervals along the first circumferential direction;

the periphery wall of heat exchange tube body still sets up along the above-mentioned annular groove that first circumference extends, the section of annular groove is outer wide interior narrow V-arrangement or falls trapezoidal, just the annular groove has a plurality ofly, along above-mentioned first axial interval arrangement to crisscross and form a plurality of alternately distributed's arch and pit mutually with above-mentioned vertical groove.

Preferably, the cross section of the protrusion is in a trapezoidal structure or a triangular structure with a small outer end and a large inner end.

Preferably, the height of the protrusion in the inward and outward direction is 0.15 to 0.25mm.

In each of the above aspects, preferably, the heat exchange tube body has a main body portion extending in the first axial direction and end portions at both ends of the main body portion, the plurality of protrusions and the plurality of recesses are uniformly distributed on the outer peripheral wall of the main body portion to form pitted sections of the heat exchange tube, and the outer peripheral wall of the end portion is smooth to form a plain tube section of the heat exchange tube. When the heat exchange tube is disposed within the heat exchanger, the two light tube sections of the heat exchange tube may be supported on a tube sheet of the heat exchanger.

Furthermore, the outer diameter of the pitted surface section is smaller than that of the light pipe section, the end part of the pitted surface section is connected with the corresponding light pipe section through a transition section, and the outer diameter of the transition section is gradually increased along the direction from the pitted surface section to the corresponding light pipe section.

Preferably, the pitted section has an outer diameter of 9.45-9.55 mm and an inner diameter of 6.68-6.72 mm. The outer diameter of the pitted surface section is the diameter of a circle formed by the outer ends of all the protrusions in a circle in the circumferential direction, and the inner diameter of the pitted surface section is the diameter of the inner peripheral wall of the heat exchange tube body.

Preferably, the number of the protrusions on one circumferential circle is 36 to 40.

The pitted surface section with the length of 25.4mm is taken as a unit, the number of the bulges between two adjacent longitudinal grooves in the unit is 29-33, and the number of the units is multiple and is designed according to actual requirements.

Compared with the prior art, the utility model has the advantages of: the longitudinal grooves and the annular grooves which are mutually staggered are arranged on the peripheral wall of the heat exchange tube body, a pitted surface structure with a plurality of alternately distributed bulges and pits can be formed between the longitudinal grooves and the annular grooves, and when fluid impacts the pits in the pitted surface structure, vortices and secondary flows can be generated in the pits and nearby, so that the fluid disturbance effect is improved, the momentum and energy exchange between a main fluid far away from the heat exchange tube and a boundary layer fluid close to the heat exchange tube is promoted, and the heat exchange is facilitated. In addition, the cross section of the longitudinal groove is in a V shape or an inverted trapezoid with the wide outside and the narrow inside, and the cross section of the annular groove is in a V shape or an inverted trapezoid with the wide outside and the narrow inside, so that the flow resistance borne by the heat exchange tube is reduced; and the applied heat exchange tube structure is suitable for heat exchange of high-viscosity fluid.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a sectional view of a partial structure of a second embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The first embodiment is as follows:

as shown in fig. 1 and 2, for the first preferred embodiment of the heat exchange tube structure for winding tube heat exchanger of the present invention, the heat exchange tube structure includes an inner hollow heat exchange tube body 1, and the length direction of the heat exchange tube body 1 is a first axial direction, and the direction around the first axial direction is a first circumferential direction, and the heat exchange tube body 1 has a main body portion extending along the first axial direction and end portions located at two ends of the main body portion.

Wherein, the outer peripheral wall 10 of the main body part of the heat exchange tube body 1 is provided with a longitudinal groove 11 extending along the first axial direction, the cross section of the longitudinal groove 11 is V-shaped with wide outside and narrow inside, and a plurality of longitudinal grooves 11 are arranged at equal intervals along the first circumferential direction; the outer peripheral wall 10 of the heat exchange tube body 1 is further provided with a plurality of annular grooves 12 extending along the first circumferential direction, the sections of the annular grooves 12 are in a V shape with wide outside and narrow inside, the plurality of annular grooves 12 are arranged at equal intervals along the first axial direction and are staggered with the longitudinal grooves 11 to form a plurality of alternately distributed bulges 110 and pits 120, and the main body part formed with the bulges 110 and the pits 120 forms a pitted surface section 1a of the heat exchange tube.

In this embodiment, the outer diameter of the pitted surface section 1a is 9.5mm, the inner diameter is 6.7mm, the cross section of each protrusion 110 is of a triangular structure with a small outer end and a large inner end, the upward height of the inner side and the outer side of each protrusion 110 is 0.2mm, the number of the protrusions 110 in one circle in the circumferential direction is 38, the number of the protrusions 110 between every two adjacent longitudinal grooves 11 in the axial direction with the length of 25.4mm is 31, and the overall length of the heat exchange tube is designed according to actual working conditions.

The outer peripheral wall 10 of the end of the heat exchange tube body 1 is smooth to form a light pipe section 1b of the heat exchange tube.

In this embodiment, the outer diameter of the pitted surface section 1a is smaller than the outer diameter of the light pipe section 1b, the end of the pitted surface section 1a is connected with the corresponding light pipe section 1b through the transition section 1c, and the outer diameter of the transition section 1c gradually increases along the direction from the pitted surface section 1a to the corresponding light pipe section 1b.

The heat exchange tube of the embodiment can be spirally wound on the periphery of a central cylinder of the heat exchanger according to the prior art, light tube sections 1b at two ends of the heat exchange tube are supported on a tube plate of the heat exchanger, heat exchange is mainly carried out by a pitted surface section 1a of the heat exchange tube, and the existence of the protrusions 110 and the pits 120 in the pitted surface section 1a can improve heat exchange efficiency, improve fluid disturbance and reduce fluid resistance.

Before the heat exchange tube of the embodiment is processed, a core rod can be inserted into the heat exchange tube to prevent the heat exchange tube from being extruded and deformed during slotting. And after the heat exchange tube is machined, the heat exchange tube needs to be subjected to solid solution treatment (the mechanical property of the material is improved), and 100% eddy current detection and underwater air tightness detection (leakage detection) are carried out.

Example two:

as shown in fig. 3, for the second preferred embodiment of the heat exchange tube structure for winding tube heat exchanger of the present invention, this embodiment is substantially the same as the first embodiment, and the difference lies in that the cross section of the longitudinal groove 11 in this embodiment is an inverted trapezoid structure with a wide outer part and a narrow inner part, the cross section of the annular groove 12 is an inverted trapezoid structure with a wide outer part and a narrow inner part, and the cross section of the protrusion 110 is a trapezoid structure with a small outer end and a large inner end.

Claims

1. A heat exchange tube structure for a wound tube heat exchanger, comprising:

the heat exchange tube comprises a heat exchange tube body (1) which is hollow inside and is provided with an outer peripheral wall (10), the length direction of the heat exchange tube body (1) is a first axial direction, and the direction surrounding the first axial direction is a first circumferential direction;

the method is characterized in that:

the outer peripheral wall (10) of the heat exchange tube body (1) is provided with a longitudinal groove (11) extending along the first axial direction, the cross section of the longitudinal groove (11) is in a V shape or an inverted trapezoid shape with a wide outer part and a narrow inner part, and a plurality of longitudinal grooves (11) are arranged at intervals along the first circumferential direction;

the outer peripheral wall (10) of the heat exchange tube body (1) is further provided with an annular groove (12) extending along the first peripheral direction, the section of the annular groove (12) is in a V shape or an inverted trapezoid shape with the wide outer part and the narrow inner part, the annular grooves (12) are arranged at intervals along the first axial direction and are staggered with the longitudinal grooves (11) to form a plurality of protrusions (110) and pits (120) which are alternately distributed.

2. The heat exchange tube structure of claim 1, wherein: the cross section of the bulge (110) is in a trapezoidal structure or a triangular structure with a small outer end and a large inner end.

3. The heat exchange tube structure according to claim 2, wherein: the height of the inner and outer directions of the bulge (110) is 0.15-0.25 mm.

4. The heat exchange tube structure of claim 1, 2 or 3, wherein: the heat exchange tube body (1) is provided with a main body part extending along the first axial direction and end parts positioned at two ends of the main body part, a plurality of bulges (110) and pits (120) are uniformly distributed on the peripheral wall (10) of the main body part to form a pitted surface section (1 a) of the heat exchange tube, and the peripheral wall (10) of the end part is smooth to form a light pipe section (1 b) of the heat exchange tube.

5. The heat exchange tube structure of claim 4, wherein: the outer diameter of the pitted surface section (1 a) is smaller than that of the light pipe section (1 b), the end part of the pitted surface section (1 a) is connected with the corresponding light pipe section (1 b) through a transition section (1 c), and the outer diameter of the transition section (1 c) is gradually increased along the direction from the pitted surface section (1 a) to the corresponding light pipe section (1 b).

6. The heat exchange tube structure of claim 5, wherein: the outer diameter of the pitted surface section (1 a) is 9.45-9.55 mm, and the inner diameter is 6.68-6.72 mm.

7. The heat exchange tube structure according to claim 6, wherein: the number of the protrusions (110) in one circle in the circumferential direction is 36-40.

8. The heat exchange tube structure of claim 6, wherein: the pitted surface section (1 a) with the length of 25.4mm is taken as a unit, the number of the bulges (110) between two adjacent longitudinal grooves (11) in the unit is 29-33, and the unit is provided with a plurality of bulges.