CN210773616U

CN210773616U - Oval distortion winding heat exchange tube of inner rib outer groove

Info

Publication number: CN210773616U
Application number: CN201920831004.2U
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: 2020-06-16
Anticipated expiration: 2029-06-04

Abstract

The utility model provides a novel heat exchange tube with an oval twisted winding inner rib outer groove, wherein a tube body is provided with a hollow inner cavity, and a convex inner rib component is arranged on the inner wall of the tube body; the outer wall of the pipe body is provided with a groove structure, and the outer wall of the pipe 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 oval; 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 oval distortion winding heat exchange tube in inner rib outer groove can improve its working medium and at intraductal heat transfer performance that flows, has advantages such as torrent degree height, heat transfer coefficient height, difficult scale deposit, has better development prospect and extensive practical application and worth.

Description

Oval distortion winding heat exchange tube of inner rib outer groove

Technical Field

The utility model relates to a reinforce heat transfer technical field, concretely relates to oval distortion winding heat exchange tube of inner rib outer trough.

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, the utility model provides a novel oval winding heat exchange tube in inner rib outer groove, this intraductal working medium torrent degree is high, heat transfer coefficient is high, difficult scale deposit.

The technical scheme of the utility model is that the heat exchange tube with the oval twisted winding inner rib outer groove comprises a heat exchange tube body, wherein the tube body is provided with a hollow inner cavity, and the inner wall of the tube body is provided with a convex inner rib component; the outer wall of the pipe body is provided with a groove structure, and the outer wall of the pipe 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 oval;

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.

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, preferably, the winding direction of the inner rib component is adapted to the thread winding direction of the outer wall of the pipe body.

Wherein, preferably, the grooves on the outer wall of the pipe body are 4-20.

Has the advantages that:

the heat exchange tube is wound in an oval mode by the inner rib outer groove, the outer wall of the heat exchange tube is provided with the groove, the inner rib is arranged on the inner side of the tube wall, and the cross section of the tube body is oval.

The utility model relates to a novel oval winding heat exchange tube in inner rib outer groove, this novel oval winding heat exchange tube spiral winding of inner rib outer groove warp winding angle (being the helical angle of outer wall), winding diameter, distortion rotation angle, outer groove degree of depth, inner rib height etc. are calculated by operating condition heat load and are confirmed. This novel inner rib outer trough 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.

Drawings

FIG. 1 is a schematic structural view of an inner rib outer groove elliptical winding heat exchange tube;

fig. 2 is a cross-sectional view of a spirally wound section in an internally ribbed, externally grooved, elliptically wound heat exchange tube.

FIG. 3 is a schematic cross-sectional structure view of an inner rib outer groove oval 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, 22-groove, 23-pipe wall, 24-inner rib component and 25-inner surface base circle.

Detailed Description

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

As shown in fig. 1, the oval winding heat exchange tube with the inner ribs and the outer grooves comprises a heat exchange tube body, wherein the tube body is provided with a hollow inner cavity, and the inner wall of the tube body is provided with a convex inner rib assembly 24; the outer wall of the pipe body is provided with a groove 22, and the outer wall of the pipe body and the groove are provided with thread structures with a certain helical angle; 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 cross section of the tube body of the winding heat exchange tube is oval (see figure 3). The inlet section 1 and the outlet section 5 are arranged in a straight section; the spirally wound section 3 is formed by spirally winding a pipe body into a circular or nearly circular cross section (see fig. 2).

Before the heat exchange tube is wound by the inner rib and the outer groove in an elliptic mode and is not twisted, the section of the tube body is elliptic, and the tube body is shown in figure 3 and comprises an outer surface base circle 21, a groove 22, a tube wall 23, an inner rib assembly 24 and an inner surface base circle 25.

This oval distortion winding pipe of inner rib outer trough is at outside processing outer trough of pipe along the axis direction of oval straight tube, and along the axis direction of oval straight tube at the inside processing inner rib of pipe, twist the straight tube and carry out spiral winding processing along the winding axis and form and process the outside of tubes recess at the outside of tubes, and the outside of tubes recess twists the rotation along the pipe axis. And processing an inner rib on the inner side of the pipe, wherein the inner rib rotates along the axis of the pipe in a twisting way, and the winding direction of the inner rib assembly is matched with the winding direction of the outer wall thread. Namely, the inner rib is processed on the inner side of the tube, and the inner rib rotates along the same direction of the cross section twist of the elliptical tube.

The utility model discloses an embodiment specifically as follows: fluid working medium enters the novel inner rib outer groove 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; the turbulence degree of the fluid in the pipeline is strengthened under the action of the twisted pipe wall, the ribs and the spiral section; finally, the fluid working medium flows out of the novel inner rib outer groove oval twisted winding heat exchange tube through the outlet transition section 4 and the outlet section 5.

A novel heat exchange tube with an inner rib and an outer groove which are twisted in an elliptic way has a technology of strengthening heat transfer inside and outside the tube simultaneously; wherein, three enhanced heat exchange technologies exist in the tube; the first strengthening technique is: due to the special structure of the spiral winding section 3, the centripetal force of fluid on the fluid action on the inner side of the pipe wall of the spiral winding pipe, which is formed by the fluid flowing in the spiral winding pipe, generates secondary flow perpendicular to the inner side of the pipe wall, so that the flowing state of the fluid on the inner side of the winding pipe is strengthened, and the turbulence effect is increased; the second intensified heat exchange technology is as follows: along the flow of inner rib water conservancy diversion direction, inner rib subassembly 24 twists the rotation along spiral winding route, and its direction of rotation is opposite with spiral pipe winding direction, and fluid working medium rotates the flow under inner rib subassembly 24 water conservancy diversion effect for the continuous alternate position of the intraductal fluid working medium forms the secondary flow tangent to the pipe wall objectively, effectively promotes the destruction of boundary layer, has strengthened the change of the flow form of the intraductal fluid working medium of winding pipe. The third intensified heat exchange technology is as follows: due to the periodic rotation transformation of the twisted elliptic pipe wall 23, the fluid working medium flows along the pipe wall and is subjected to the acting force which is vertical to the inner side of the pipe wall and the direction of the acting force is changed all the time, and the generated secondary flow can effectively break the boundary layer, enhance the turbulent flow effect of the flow in the pipe and strengthen the flow heat transfer effect.

The utility model provides a novel oval distortion of inner rib outer tank twines the outside of tubes recess of heat exchange tube and has carried out the distortion rotation along the pipe axis, and the outside of tubes recess has formed periodic variation, and when fluid working medium passed through the outside surface of this novel oval distortion of inner rib outer tank twines the heat exchange tube, the shape of the recess in the outside of tubes plays the effect that destroys the flow boundary layer, makes the torrent effect outside of tubes further strengthen.

In the novel heat exchange tube with the inner ribs and the outer grooves twisted in an oval shape, a plurality of enhanced heat exchange technologies are overlapped, so that a boundary layer and dirt on a fluid wall surface can be effectively damaged, and a heat exchange coefficient is improved; the novel inner rib oval-twisted 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 an oval distortion of inner rib outer grove twines heat exchange tube, includes the heat exchange tube body, its characterized in that: the tube body is provided with a hollow inner cavity, and the inner wall of the tube body is provided with a convex inner rib component; the outer wall of the pipe body is provided with a groove structure, and the outer wall of the pipe 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 oval; the oval comprises an outer surface base circle, a groove, a pipe wall, an inner rib assembly and an inner surface base circle;

2. The internally ribbed externally grooved elliptically twisted 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.

3. The internally ribbed externally grooved elliptically twisted 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.

4. The internally ribbed externally grooved elliptically twisted 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.

5. The internally ribbed externally grooved elliptically twisted heat exchange tube of claim 1, wherein: the screw pitches of the outer walls of the pipe bodies are equal.

6. The internally ribbed externally grooved elliptically twisted heat exchange tube of claim 1, wherein: the winding direction of the inner rib component is matched with the winding direction of the threads on the outer wall of the pipe body.

7. The internally ribbed externally grooved elliptically twisted heat exchange tube of claim 1, wherein: the grooves on the outer wall of the pipe body are 4-20.