CN210802172U

CN210802172U - Petal type spiral winding heat exchange tube

Info

Publication number: CN210802172U
Application number: CN201920831003.8U
Authority: CN
Inventors: 曹洪海; 王学生; 刘建书; 陈琴珠
Original assignee: Wuxi Chemical Equipment Co ltd
Current assignee: Wuxi Chemical Equipment Co ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-06-19
Anticipated expiration: 2029-06-04

Abstract

The utility model provides a novel petal type spiral winding heat exchange tube, this heat exchange tube are pressed into petal type straight tube by the straight tube, and it is rotatory to warp along the pipe axis to and carry out spiral winding around the winding axis and warp the processing and form. The pipe body is provided with a hollow inner cavity, the outer wall of the pipe body is provided with a groove, and the outer wall of the pipe body and the groove are provided with thread structures with certain helical angles; the cross section of the pipe body of the winding heat exchange pipe is in a petal shape, and a plurality of arcs between the grooves are connected end to end and surround a circle to form a petal-shaped structure; the pipe body comprises an inlet section, an inlet transition section, a spiral winding section, an outlet transition section and an outlet section which are connected in sequence; the inlet section and the outlet section are arranged in a straight section; the spiral winding section part is formed by spirally winding the pipe body into a circular or approximately circular cross section. The utility model relates to a novel petal type spiral winding heat exchange tube, its working medium have the advantage that torrent degree is high, heat transfer coefficient is high, difficult scale deposit when the heat transfer of intraductal flow, have better development prospect and extensive practical application and worth.

Description

Petal type spiral winding heat exchange tube

Technical Field

The utility model relates to a reinforce heat transfer technical field, concretely relates to petal type spiral winding heat exchange tube.

Background

The heat exchanger has wide application in various industries of national economy, is one of the most common devices in energy, petroleum, chemical engineering, metallurgy, power, light industry, food and even aerospace industries, and is an important device for developing secondary energy and realizing heat recovery and energy conservation and dissipation; at present, a shell-and-tube heat exchanger is widely applied due to large flow, small pressure drop loss and high operation pressure; the heat exchange tubes of the shell-and-tube heat exchanger in engineering application all use light tubes, and the turbulent flow effect of working fluid in the light tubes is poor, so that the defects of unobvious heat exchange effect and low heat exchange efficiency are caused; the shell-and-tube heat exchanger generally has a long operation period, impurities and other dirt in fluid are deposited and are easy to block, the efficiency of equipment is influenced, and particularly, the heat exchange pipeline of a large shell-and-tube heat exchanger is blocked, so that the heat exchange effect is influenced, and the operation of the whole process flow is influenced; the spiral wound tube type heat exchanger has the characteristics of large heat transfer area per unit volume, small occupied area, high heat transfer coefficient, small heat transfer temperature difference, high heat transfer efficiency, high pressure resistance, self-compensation of thermal expansion, difficulty in scaling, easiness in realizing large-scale and the like, and also has the function of realizing simultaneous heat transfer of multiple media. The spiral wound tube type heat exchanger is mainly applied to the industries of air separation, liquefied natural gas and the like. In recent years, with the development of large-scale petrochemical, coal chemical and liquefied natural gas devices, spiral wound tube heat exchangers have been used in large quantities due to their advantages of high heat transfer efficiency, compact structure and the like. For example, a hydrogenation reactor of a large oil refining device, a high-pressure material heat exchanger at the rear part of a reforming reactor of a PX device, a methanol washing heat exchanger in a coal-to-methanol device, and a reactor rear heat exchanger in a coal-to-ethylene glycol device all adopt spiral-wound tubular heat exchangers to replace a traditional baffle plate type heat exchanger, a thread locking ring type heat exchanger and a plate shell type heat exchanger, so that the operation of high pressure resistance and zero leakage is realized. The spiral wound tube type heat exchanger has wide market prospect in the industries of petrochemical industry, coal chemical industry and the like. In the common spiral winding pipe, due to the action of centripetal force, secondary flow moving towards the inner side of the winding pipe is generated in the winding pipe, and along with the gradual stabilization of the flow form, the temperature distribution that the temperature of the fluid working medium at the inner side of the winding pipe is low and the temperature of the fluid working medium at the outer side of the winding pipe is high is formed.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a petal type spiral winding heat exchange tube, the torrent degree is high, heat transfer coefficient is high, difficult scale deposit when intraductal working medium flows the heat transfer in the pipe.

The technical scheme of the utility model is that the petal-shaped spiral winding heat exchange tube comprises a heat exchange tube body, wherein the tube body is provided with a hollow inner cavity, the outer wall of the tube body is provided with a groove, and the outer wall of the tube body and the groove are provided with thread structures with certain spiral angles; the cross section of the pipe body of the winding heat exchange pipe is in a petal shape, and a plurality of arc-shaped grooves are connected end to end and surround a circle to form a petal-shaped structure;

the pipe body comprises an inlet section, an inlet transition section, a spiral winding section, an outlet transition section and an outlet section which are connected in sequence; the inlet section and the outlet section are arranged in a straight section; the spiral winding section part is formed by spirally winding the pipe body into a circular or approximately circular cross section.

The cross section of the pipe body of the winding heat exchange pipe is in a petal shape, a plurality of arc-shaped end-to-end connection surrounds a circle to form a petal-shaped structure, so that arc-shaped groove indentations are pressed in the pipe wall, and the grooves are in relatively convex arc shapes and are connected to form the petal-shaped cross section.

Preferably, the arcs are the same in size and shape.

Wherein, preferably, the spiral angles of the threads on the outer wall of the inlet section pipe body are the same.

Wherein, preferably, the spiral angle of the thread on the outer wall of the outlet section pipe body is the same.

Wherein, preferably, the thread direction of the outer wall of the pipe body is opposite to the winding rotation direction of the pipe body in the spiral winding section part.

Namely, if the spiral winding direction of the thread on the outer wall of the pipe body is clockwise, the twisting rotation direction of the section of the pipe body in the spiral winding section part is anticlockwise; if the spiral winding direction of the thread on the outer wall of the pipe body is anticlockwise, the twisting and rotating direction of the section of the pipe body in the spiral winding section part is clockwise.

Wherein, preferably, the thread pitches of the outer walls of the pipe bodies are equal.

Wherein, it is preferred that, the winding direction of recess among the petal type structure suits with body outer wall screw thread winding direction. That is, the straight pipe is twisted in the same direction, the groove on the outer wall of the pipe body and the whole outer wall of the pipe body are twisted in the same direction, and the formed winding angle or helical angle is also the same.

Wherein, the preferred arc quantity of body cross-section is 2-10.

Has the advantages that:

this petal type spiral winding heat exchange tube, heat exchange tube outer wall have the arc recess, and the cross-section is petal type structure. After the spiral is twisted, the groove is of a certain spiral angle, which is beneficial to improving the heat exchange efficiency.

The utility model relates to a novel petal type spiral winding heat exchange tube, this petal type spiral winding heat exchange tube spiral winding warp's winding angle (the helical angle of outer wall promptly), winding diameter, distortion rotation angle, along the distortion rotation angle of winding direction etc. are calculated by operating condition heat load and are confirmed. The novel winding heat exchange tube has the advantages that the turbulence degree of working media in the tube is high, the heat exchange coefficient is high, and scaling is not easy to occur when the working media flow in the tube for heat exchange.

Drawings

FIG. 1 is a schematic structural view of a petal-shaped spirally wound heat exchange tube;

fig. 2 is a cross-sectional view of a spirally wound section in a petal-type spirally wound heat exchange tube.

FIG. 3 is a schematic structural view of a four-leaf petal section of the novel petal-shaped spiral winding heat exchange tube;

FIG. 4 is a schematic structural view of a five-leaf petal section of the novel petal-shaped spiral winding heat exchange tube;

FIG. 5 is a schematic structural view of a six-petal cross section of the novel petal-shaped spiral winding heat exchange tube;

in the figure: 1-inlet section, 2-inlet transition section, 3-spiral winding section, 4-outlet transition section, 5-outlet section, 21-outer surface base circle of four-leaf petal section, 22-petal of four-leaf petal section, 23-transition section of four-leaf petal section, 24-inner surface base circle of four-leaf petal section, 31-outer surface base circle of five-leaf petal section, 32-petal of five-leaf petal section, 33-transition section of five-leaf petal section, 34-inner surface base circle of five-leaf petal section, 41-outer surface base circle of six-leaf petal section, 42-petal of six-leaf petal section, 43-transition section of six-leaf petal section and 44-inner surface base circle of six-leaf petal section.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1, a petal-shaped spirally-wound heat exchange tube comprises a heat exchange tube body, wherein the tube body is provided with a hollow inner cavity, the outer wall of the tube body is provided with a groove, and the outer wall of the tube body and the groove are provided with thread structures with a certain spiral angle; the cross section of the pipe body of the winding heat exchange pipe is in a petal shape, and a plurality of arc-shaped grooves are connected end to end and surround a circle to form a petal-shaped structure;

the pipe body comprises an inlet section 1, an inlet transition section 2, a spiral winding section 3, an outlet transition section 4 and an outlet section 5 which are connected in sequence; the inlet section 1 and the outlet section 5 are arranged in a straight section; the spiral winding section part is formed by spirally winding the pipe body into a circular or approximately circular cross section. (see FIG. 2).

The petal-shaped spiral winding heat exchange tube has petal-shaped section. In a preferred embodiment, the petals can be of a four-leaf type, a five-leaf type or a six-leaf type, as shown in fig. 3-5. The four-leaf petal section comprises an outer surface base circle 21 of the four-leaf petal section, a flower 22 of the four-leaf petal section, a transition section 23 of the four-leaf petal section and an inner surface base circle 24 of the four-leaf petal section. The cross section of the five-leaf petal comprises an outer surface base circle 31 of the cross section of the five-leaf petal, petals 32 of the cross section of the five-leaf petal, a transition section 33 of the cross section of the five-leaf petal and an inner surface base circle 34 of the cross section of the five-leaf petal. In fig. 5, the cross section of the hexalobular petals includes an outer surface base circle 41 of the hexalobular petal cross section, petals 42 of the hexalobular petal cross section, a transition section 43 of the hexalobular petal cross section, and an inner surface base circle 44 of the hexalobular petal cross section.

The petal-shaped spiral winding heat exchange tube is formed by pressing a straight tube into a petal-shaped straight tube, twisting and rotating the straight tube along the axis of the tube, and spirally winding the straight tube around a winding axis to deform the straight tube. The winding direction of the groove is adapted to the winding direction of the thread of the outer wall, the groove of the outer wall of the pipe body and the outer wall of the whole pipe body are twisted in the same direction, and the formed winding angle or helical angle is also the same.

The utility model discloses an embodiment specifically as follows: fluid working medium enters the novel petal-shaped spiral winding heat exchange tube from the inlet section 1, passes through the inlet transition section 2 and then flows into the spiral winding section 3; there are two flow enhancements to the fluid working medium in the spiral wound section 3: the superposition of the centripetal secondary flow and the flow along the petal flow guide direction promotes the turbulence degree of the spiral winding section 3; finally, the fluid working medium flows out of the novel petal-shaped spiral winding heat exchange tube from the outlet transition section 4 and the outlet section 5.

A novel petal-shaped spiral winding heat exchange tube has a reinforced heat transfer technology which is reinforced in the tube and outside the tube; wherein, two enhanced heat exchange technologies exist in the tube; the first intensified heat exchange technology is as follows: the special centrifugal force of the spiral winding pipe generates secondary flow, and because of the special structure of the spiral winding section 3, the centripetal force vertical to the inner side of the pipe wall of the winding pipe is generated in the flowing process, so that the secondary flow vertical to the inner side of the pipe wall is generated, the flowing state of the fluid on the inner side of the winding pipe is strengthened, and the flowing turbulence effect is increased; the second intensified heat exchange technology is as follows: along the flow of petal water conservancy diversion direction, petal 22 has carried out the distortion rotation along the spiral winding route, its direction is opposite with the direction of spiral winding deformation, fluid working medium carries out the rotational flow along petal 22 water conservancy diversion direction, with the winding outside of tubes fluid working medium with the continuous alternate transformation position of inboard fluid working medium, the rotation secondary flow of tangent in the pipe wall has objectively formed, effectively promote the destruction of boundary layer, it is low to have broken the temperature of the inboard fluid working medium of winding pipe, the temperature distribution phenomenon that the temperature of the outside fluid working medium of winding pipe is high, the change of the flow form of the fluid working medium in the winding pipe has been strengthened.

The utility model provides a cross sectional shape of novel petal type spiral winding heat exchange tube is the petal form, has carried out the distortion rotation along spiral winding route, and objective top tube surface becomes unsmooth alternate periodic variation, and fluid medium, when flowing through the outside surface of this novel petal type spiral winding heat exchange tube, the unsmooth alternate periodic variation's in the outside of tubes shape plays the effect that destroys the flow boundary layer, makes the turbulent effect further reinforcing outside the tubes.

In the novel petal-shaped spiral winding heat exchange tube, a plurality of intensified heat exchange technologies are superposed, so that a fluid wall surface boundary layer and a dirt layer are strongly damaged, the heat exchange coefficient is improved, and scaling is not easy to occur; the novel petal-shaped spiral winding heat exchange tube has the advantages of high heat transfer efficiency, compact structure, strong bearing capacity and the like, and has better development prospect and wide practical application value.

Claims

1. The utility model provides a petal type spiral winding heat exchange tube, includes the heat exchange tube body, its characterized in that: the tube body is provided with a hollow inner cavity, the outer wall of the tube body is provided with a groove, and the outer wall of the tube body and the groove are provided with thread structures with a certain helical angle; the cross section of the pipe body of the winding heat exchange pipe is in a petal shape, and a plurality of arc-shaped grooves are connected end to end and surround a circle to form a petal-shaped structure; the cross section comprises an outer surface base circle of the petal cross section, a flower of the petal cross section, a transition section of the petal cross section and an inner surface base circle of the petal cross section;

2. The petal-type spirally wound heat exchange tube of claim 1, wherein: the arc shape is the same in size and shape.

3. The petal-type spirally wound heat exchange tube of claim 1, wherein: the spiral angles of the threads on the outer wall of the inlet section pipe body are the same.

4. The petal-type spirally wound heat exchange tube of claim 1, wherein: the spiral angles of the threads on the outer wall of the outlet section pipe body are the same.

5. The petal-type spirally wound heat exchange tube of claim 1, wherein: the thread direction of the outer wall of the pipe body is opposite to the winding rotation direction of the pipe body in the spiral winding section part.

6. The petal-type spirally wound heat exchange tube of claim 1, wherein: the screw pitches of the outer walls of the pipe bodies are equal.

7. The petal-type spirally wound heat exchange tube of claim 1, wherein: the winding direction of the groove in the petal-shaped structure is matched with the winding direction of the threads on the outer wall of the pipe body.

8. The petal-type spirally wound heat exchange tube of claim 1, wherein: the number of arcs of the cross section of the pipe body is 2-10.