CN209926939U - Horizontal oblique cone thread condenser pipe heat exchanger - Google Patents

Abstract

The utility model relates to a horizontal oblique cone line condenser pipe heat exchanger belongs to heat exchanger technical field. The condenser comprises a condenser pipe, wherein the condenser pipe comprises an inlet light pipe section, a middle pipe body and an outlet light pipe section which are sequentially communicated; the outer surface of the middle pipe body is distributed with inclined outer conical grains, and the inner surface of the middle pipe body is distributed with inclined inner conical grains. The utility model adopts the condenser pipe with the inclined inner conical lines and the inclined outer conical lines, which not only can increase the heat transfer area, but also is beneficial to the diversion and the dripping of the condensate; the conical protrusions on the inner surface of the condenser pipe enable fluid in the pipe to form vortex or turbulence, and the heat exchange efficiency of the condenser pipe is further improved.

Description

Horizontal oblique cone thread condenser pipe heat exchanger

Technical Field

The utility model relates to a horizontal oblique cone line condenser pipe heat exchanger belongs to heat exchanger technical field.

Background

The shell-and-tube condenser is an important type of shell-and-tube heat exchanger, is used for realizing the whole or partial condensation of gaseous media in petroleum and chemical production, and has wide application. Therefore, the improvement of the condensation effect of the condenser has a very positive effect on improving the operation quality of the device and reducing the cost of unit products. Most of heat exchange tubes used in the horizontal shell-and-tube condenser in the industrial field are light tubes, the outer surfaces of the heat exchange tubes are smooth integral surfaces, liquid condensed by shell pass gas phase is accumulated on the outer surfaces of the heat exchange tubes to easily form a liquid film, and meanwhile, the flow velocity of fluid at a laminar flow bottom layer close to a wall surface in the tubes is very low to form thermal resistance, so that the contact between the gas phase and the outer surfaces of the heat exchange tubes is isolated, the heat transfer between the gas phase and the heat exchange tubes is blocked, the heat transfer efficiency is reduced.

In recent years, various heat transfer enhancing elements, such as grooved tubes, finned tubes, threaded tubes, cross-grooved tubes, etc., have been developed on the basis of light pipes in various engineering institutions and manufacturers for enhancing heat transfer effects. Theoretically, any rough surface or strengthening technology can achieve the purpose of strengthening heat exchange, but due to the influence of capillary action and surface tension, flowing media can be retained in geometric grooves of the pipe wall to different degrees, so that the heat transfer efficiency is influenced, and sometimes the effect is not even as good as the condensation effect of a light pipe.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a horizontal inclined conical-line condenser pipe heat exchanger, which adopts a condenser pipe with inclined inner conical lines and inclined outer conical lines, not only can increase the heat transfer area, but also is beneficial to the diversion and dripping of condensate; the conical protrusions on the inner surface of the condenser pipe enable fluid in the pipe to form vortex or turbulence, and the heat exchange efficiency of the condenser pipe is further improved.

The horizontal oblique taper condenser tube heat exchanger comprises a condenser tube, wherein the condenser tube comprises an inlet light pipe section, a middle pipe body and an outlet light pipe section which are sequentially communicated; the outer surface of the middle pipe body is distributed with inclined outer conical grains, and the inner surface of the middle pipe body is distributed with inclined inner conical grains.

Working process or working principle:

the horizontal oblique conical-grain condenser pipe heat exchanger is characterized in that outer conical grains with a certain inclination angle are distributed on the outer surface of the condenser pipe and the middle pipe body, and when an outer medium of the pipe, usually a gas phase medium such as a vapor distillate, water vapor, refrigerant vapor and the like, is in contact with the convex surface of the conical grains, condensation is generated, and a layer of continuous liquid film is gradually formed after the surface of the conical grains is wetted. Under the action of gravity, liquid tends to gather towards the conical thread top end along the conical thread inclined surface, the area of the conical thread top end is almost negligible, so that liquid drops can quickly drop when flowing to the conical thread top end, and the liquid drops further pull the liquid on the inclined conical surface to gather towards the top end. The conical grains are distributed annularly along the outer surface of the pipe wall, the adjacent conical grains are connected in an arc, and condensed liquid drops on the upper part of the pipe body can flow down along the arc groove. The inclined conical grains on the outer wall of the tube increase the heat transfer contact area of the gas-phase medium and the tube wall, and improve the condensation efficiency.

The inner cone of the inner surface of the pipe body forms a vortex when the medium flows along the inner cone, and the heat transfer effect is better.

When fluid in a pipe, usually liquid phase media such as circulating water, chilled water and the like, flows through along a specific direction, namely the direction of the inclination of the conical veins in the inner wall of the middle pipe body, the flow velocity of the fluid close to the pipe wall is slow, a formed laminar flow bottom layer enters the arc groove along the inclined surface of the inner conical veins, then the flow direction is changed to generate cross mixing collision with subsequent fluid, a stagnant flow boundary layer is continuously damaged, the media can also reach a turbulent flow state at a lower flow velocity, and therefore the heat transfer effect in the pipe is improved.

The outer cone threads distributed on the outer surface of the middle pipe body and the inner cone threads distributed on the inner surface of the middle pipe body have the same inclination angle.

The inclination angle of the outer conical grains distributed on the outer surface of the middle pipe body is 5-30 degrees; the inclination angle of the inner taper lines distributed on the inner surface of the middle pipe body is 5-30 degrees.

The outer conical grains distributed on the outer surface of the middle pipe body and the inner conical grains distributed on the inner surface of the middle pipe body have the same inclination direction, and the inclined surfaces are parallel to each other. The outer conical grains distributed on the outer surface of the middle pipe body of the condensing pipe and the inner conical grains distributed on the inner surface of the middle pipe body have the same inclination angle and inclination direction, so that the wall thickness of any cross section of the middle pipe body is not less than the minimum design thickness, and the requirement of strength calculation is met.

The outer conical grains distributed on the outer surface of the middle pipe body are distributed annularly, and the inner conical grains distributed on the inner surface of the middle pipe body are distributed annularly.

The height H2 of the external cone-shaped bulges distributed on the outer surface of the middle pipe body is equal to the height H1 of the internal cone-shaped bulges distributed on the inner surface of the middle pipe body; h2 is more than or equal to 2.0mm and less than or equal to 4.0mm, and H1 is more than or equal to 2.0mm and less than or equal to 4.0 mm.

The joint of two adjacent external conical grains is in arc transition, and the arc radius R2 of the transition of the external conical grains is more than or equal to 0.8mm and less than or equal to 2.0 mm; the connection part of two adjacent inner conical grains is in circular arc transition, the circular arc radius R1 of the transition of the inner conical grains is more than or equal to 0.8mm and less than or equal to 2.0mm, and R1 is equal to R2. The arc grooves at the joint of the adjacent conical grains can not only play a role of guiding liquid, but also avoid stress concentration generated by a sharp-angled structure, thereby prolonging the service life of the tube bundle.

The installation direction of the condenser pipe is matched with the flowing direction of fluid in the pipe, and the flowing direction of the fluid in the pipe flows from the small-opening end to the large-opening end of the inner conical thread of the middle pipe body. And determining the installation direction of the condensation pipe according to the set flowing direction of the fluid in the pipe, and ensuring that the fluid in the pipe flows from the small-opening end to the large-opening end of the inner cone.

The outer diameter of the inlet light pipe section is equal to the maximum outer diameter of the middle pipe body; the outer diameter of the outlet light pipe section is equal to the maximum outer diameter of the middle pipe body.

The inlet light pipe section and the outlet light pipe section are used for connecting the tube plates; the lengths of the inlet light pipe section and the outlet light pipe section are set corresponding to the thickness of the tube plate. The length of the inlet light pipe segment and the outlet light pipe segment may be greater than or equal to the thickness of the tube sheet.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses an outer conical lines of middle body outer wall increase annular slope has increased heat transfer area, has strengthened the water conservancy diversion to the condensate. When the medium outside the pipe gradually forms a liquid film on the surface of the conical texture, the liquid film is gathered into liquid drops under the action of gravity and can be rapidly dropped when the liquid drops flow to the top end of the conical texture, and the liquid on the inclined conical surface is further pulled to be gathered towards the top end when the liquid drops. The conical grains are distributed annularly along the outer surface of the pipe wall, the adjacent conical grains are connected in an arc, and condensed liquid drops on the upper part of the pipe body can flow down along the arc groove. The inclined conical grains on the outer wall of the tube increase the heat transfer contact area of the gas-phase medium and the tube wall, and improve the condensation efficiency. The outer conical grains are uniformly distributed on the pipe body, so that condensate can be dispersed and dripped rapidly, and the condensation efficiency is improved.

2. Through increase the interior taper line of annular slope at the body inner wall, the stable flow boundary has been destroyed to pertinence, makes the low-speed laminar flow constantly produce vortex or torrent, has strengthened fluidic radial mixture, has changed the temperature distribution of internal surface department to strengthen heat transfer effect, improved the heat exchange efficiency of condenser pipe.

Drawings

Figure 1 is a schematic view of the overall structure of an embodiment of the present invention,

figure 2 is a schematic view of a condenser tube structure according to an embodiment of the present invention,

FIG. 3 is a schematic view illustrating the flow of the medium inside and outside the condenser tube according to an embodiment of the present invention,

figure 4 is an enlarged view of the structure at C2 in figure 1,

fig. 5 is an enlarged schematic view of the structure at C1 in fig. 1.

In the figure: 1. the condenser comprises a tube box 2, a shell 3, an outer head cover 4, a tube plate 5, a condenser tube 6, a central axis 7, a tube inside 8, a tube wall 9, a tube outside 10, a tube side outlet 11, a tube side inlet 12, a shell side inlet A13, a shell side outlet 14, a shell side inlet B15 and a baffle plate;

5.1, an inlet light pipe section 5.2, a middle pipe body 5.3, an outer cone 5.4, an inner cone 5.5 and an outlet light pipe section.

In the figure:

h1 denotes the internal taper protrusion height;

h2 denotes the outer cone protrusion height;

r1 represents the transition arc radius of the inner wall of the intermediate pipe body;

r2 represents the transition arc radius of the outer wall of the middle pipe body;

in fig. 1: arrows a1, a2, A3, a4, a6 indicate tube-side fluid flow directions;

in fig. 1: arrows B1, B2, B3, B4 indicate the shell-side fluid flow direction;

in fig. 3: the arrows inside the tubes of the intermediate tube body indicate the flow state of the fluid inside the tubes;

in fig. 3: the arrows outside the pipe of the middle pipe body indicate the flowing state of the medium outside the pipe;

the arrows a5 in fig. 4 indicate the tube-side fluid flow direction;

the arrows a7 in fig. 5 indicate the tube-side fluid flow direction.

Detailed Description

The technical solution in the embodiments of the present invention will be further clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention:

example 1

As shown in fig. 1-5, horizontal oblique taper condenser pipe heat exchanger, including pipe case 1, casing 2, outer skull 3, tube sheet 4, condenser pipe 5, casing 2 first end is equipped with pipe case 1, and casing 2 second end is equipped with outer skull 3, is equipped with the tube sheet between pipe case and the casing, runs through the tube sheet and is equipped with the condenser pipe. Taking a condenser with two tube passes and a single-pass shell as an example, the two tube passes comprise a tube pass first-zone condensing tube and a tube pass second-zone condensing tube. Fig. 4 shows a tube side two-zone condenser tube, and fig. 5 shows a tube side one-zone condenser tube. The tube box is provided with a tube pass inlet 11 and a tube pass outlet 10, and the shell is provided with a shell pass inlet and a shell pass outlet 13. There may be 2 shell-side inlets, typically 2 shell-side inlets, including shell-side inlet a12 and shell-side inlet B14.

The tube pass cold fluid enters from the tube pass inlet, flows through the tube pass first-zone condensing tube rightwards, flows through the tube pass second-zone condensing tube leftwards after being turned at the right end of the heat exchanger, and flows out from the tube pass outlet; the shell-side thermal fluid enters from an upper shell-side inlet A and a shell-side inlet B, passes through the baffle plate 15 and then flows out from a shell-side outlet. As shown in fig. 1, the condenser tubes in the first and second tube pass zones are installed in opposite directions, and flow from the small end to the large end of the inner cone, depending on the flow direction of the fluid in the tubes.

The condenser tube 5 comprises an inlet light tube section 5.1, a middle tube body 5.2 and an outlet light tube section 5.5 which are sequentially communicated; the outer surface of the middle tube body 5.2 is distributed with inclined outer conical grains 5.3, and the inner surface of the middle tube body 5.2 is distributed with inclined inner conical grains 5.4. The intermediate pipe body 5.2 is rolled by using a common carbon steel pipe material with the diameter of 25 multiplied by 2.5 as a base pipe.

The installation direction of the condensation pipe 5 is adapted to the flowing direction of fluid in the pipe, and the flowing direction of the fluid in the pipe is from the small-mouth end of the inner cone 5.4 of the middle pipe body 5.2 to the large-mouth end. The outer diameter of the inlet light pipe section 5.1 is equal to the maximum outer diameter of the middle pipe body 5.2; the outer diameter of the outlet light pipe section 5.5 is equal to the maximum outer diameter of the intermediate pipe body 5.2. The inlet light pipe section 5.1 and the outlet light pipe section 5.5 are used for connecting the tube plate 4; the length of the inlet light pipe section 5.1 and the outlet light pipe section 5.5 is adapted to the thickness of the tube plate 4.

Example 2

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the intermediate pipe body 5.2 and the inner taper 5.4 distributed on the inner surface of the intermediate pipe body 5.2 have the same inclination angle. The inclination angle of the outer conical grains 5.3 distributed on the outer surface of the middle pipe body 5.2 is 20 degrees; the inner taper 5.4 distributed on the inner surface of the middle tube body 5.2 has an inclination angle of 20 degrees. The rest is the same as example 1.

Example 3

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the middle tube body 5.2 has an inclination angle of 30 °; the inner conical threads 5.4 distributed on the inner surface of the middle pipe body 5.2 have an inclination angle of 30 degrees. The rest is the same as example 2.

Example 4

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the middle tube body 5.2 has an inclination angle of 5 °; the inner taper 5.4 distributed on the inner surface of the middle tube body 5.2 has an inclination angle of 5 degrees. The rest is the same as example 2.

Example 5

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the middle tube body 5.2 has an inclination angle of 15 °; the inner taper 5.4 distributed on the inner surface of the intermediate pipe body 5.2 has an inclination angle of 15 degrees. The rest is the same as example 2.

Example 6

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the middle tube body 5.2 has an inclination angle of 25 °; the inner taper 5.4 distributed on the inner surface of the intermediate pipe body 5.2 has an inclination angle of 25 degrees. The rest is the same as example 2.

Example 7

As shown in fig. 2, the outer taper 5.3 distributed on the outer surface of the intermediate pipe body 5.2 and the inner taper 5.4 distributed on the inner surface of the intermediate pipe body 5.2 are inclined in the same direction, and the inclined surfaces are parallel to each other. The outer conical veins 5.3 distributed on the outer surface of the middle tube body 5.2 are distributed annularly, and the inner conical veins 5.4 distributed on the inner surface of the middle tube body 5.2 are distributed annularly. The outer conical thread 5.3 protruding height H2 distributed on the outer surface of the middle tube body 5.2 is equal to the inner conical thread 5.4 protruding height H1 distributed on the inner surface of the middle tube body 5.2; h2-2 mm, H1-2 mm. And controlling the distance between the inner conical grain plane and the outer conical grain plane to be 2.2-3 mm during rolling. Typically 2.2mm, 2.5mm, 2.8mm or 3 mm. The rest is the same as example 2.

Example 8

H2-3 mm and H1-3 mm. The rest is the same as example 7.

Example 9

H2-4 mm and H1-4 mm. The rest is the same as example 7.

Example 10

As shown in fig. 2, the intermediate pipe body 5.2 is roll-formed using a normal carbon steel pipe material having a diameter of 38 × 3.5 as a base pipe. The joint of two adjacent outer conical grains 5.3 is in arc transition, and the arc radius R2 of the transition of the outer conical grains is 2.0 mm; the connecting position of two adjacent inner conical threads 5.4 is in circular arc transition, the circular arc radius R1 of the inner conical thread transition is 2.0mm, and R1 is equal to R2. The rest is the same as example 7.

Example 11

As shown in fig. 2, the intermediate pipe body 5.2 is rolled using a normal carbon steel pipe material having a diameter of 19 × 3 as a base pipe. The radius R2 of the transition arc of the external taper is 0.8 mm; the connecting position of two adjacent inner conical grains 5.4 is in circular arc transition, and the circular arc radius R1 of the transition of the inner conical grains is 0.8 mm. The rest is the same as in example 10.

Example 12

As shown in fig. 2, the intermediate pipe body 5.2 is rolled using a normal carbon steel pipe material having a diameter of 25 × 2 as a base pipe. The radius R2 of the transition arc of the external taper is 1.0 mm; the junction of two adjacent inner conical grains 5.4 is in circular arc transition, the circular arc radius R1 of the transition of the inner conical grains is 1.0mm, and the rest is the same as that of the embodiment 10.

Working process or working principle:

as shown in fig. 3, the shell-side heat fluid such as the medium and the water vapor outside the tube 9 on the side of the central axis 6 of the intermediate tube body enters the shell from the shell-side inlet at a low speed, contacts with the outer surface of the condensing tube, and is condensed after fully exchanging heat, thereby gradually forming a continuous liquid film. Under the action of gravity, liquid gathers towards the top end of the conical texture along the inclined surface of the conical texture, liquid drops are formed quickly when the liquid drops to the tip end of the conical texture, and the liquid on the inclined conical surface is further pulled to gather towards the top end when the liquid drops. Fluid in the pipe 7, cooling water and the like flows into the condenser pipe from the left side, the inner conical thread inclined plane of the fluid close to the pipe wall 8 enters the arc groove, the flow direction is changed to be mixed with subsequent fluid in a crossed mode to form vortex or turbulence, the fluid close to the central axis 6 is provided with a heat exchange opportunity close to the pipe wall, heat transfer enhancement is carried out on the inside and the outside of the pipe at the same time, and heat exchange efficiency is improved.

The utility model discloses mainly used petrochemical industry device technology condensation, horizontal oblique taper condensation pipe heat exchanger adopt the condenser pipe of two sides intensive surface geometry, in the time of increase heat transfer area, reduced the condensate in the delay of tub outer wall to utilize its distinctive taper structure at intraductal vortex or torrent that forms, thereby increase substantially the condensation efficiency of heat exchange tube, strengthen the heat transfer effect of condenser. The utility model discloses the structural commonality is strong, and the condensation is efficient, and condenser pipe is processing conveniently in batches.

The utility model discloses in to the direction of structure and the description of relative position relation, it is right not to constitute like the description from top to bottom all around the utility model discloses a restriction only is the description convenient.

Claims (10)

1. A horizontal oblique-cone-pattern condenser tube heat exchanger is characterized by comprising a condenser tube (5), wherein the condenser tube (5) comprises an inlet light tube section (5.1), a middle tube body (5.2) and an outlet light tube section (5.5) which are sequentially communicated;

the outer surface of the middle pipe body (5.2) is distributed with inclined outer conical grains (5.3), and the inner surface of the middle pipe body (5.2) is distributed with inclined inner conical grains (5.4).

2. The horizontal oblique-coned condenser tube heat exchanger according to claim 1 wherein the outer conical surface (5.3) of the intermediate tube body (5.2) and the inner conical surface (5.4) of the intermediate tube body (5.2) are inclined at the same angle.

3. The horizontal oblique conical corrugated condenser tube heat exchanger according to claim 2, wherein the outer conical corrugations (5.3) distributed on the outer surface of the intermediate tube body (5.2) have an inclination angle of 5-30 °; the inclination angle of the inner conical grains (5.4) distributed on the inner surface of the middle pipe body (5.2) is 5-30 degrees.

4. A horizontal oblique-coned condenser tube heat exchanger according to claim 3 characterized in that the outer conical corrugations (5.3) distributed on the outer surface of the intermediate tube body (5.2) and the inner conical corrugations (5.4) distributed on the inner surface of the intermediate tube body (5.2) are inclined in the same direction and the inclined surfaces are parallel to each other.

5. The horizontal oblique-cone condenser tube heat exchanger according to claim 1 wherein the outer cone (5.3) of the outer surface of the intermediate tube body (5.2) is annularly distributed and the inner cone (5.4) of the inner surface of the intermediate tube body (5.2) is annularly distributed.

6. The horizontal oblique-coned condenser tube heat exchanger according to claim 5, wherein the external conical corrugation (5.3) protrusion height (H2) distributed on the external surface of the intermediate tube body (5.2) is equal to the internal conical corrugation (5.4) protrusion height (H1) distributed on the internal surface of the intermediate tube body (5.2); h2 is more than or equal to 2.0mm and less than or equal to 4.0mm, and H1 is more than or equal to 2.0mm and less than or equal to 4.0 mm.

7. The horizontal oblique conical condenser tube heat exchanger according to claim 5, wherein the joint of two adjacent external conical corrugations (5.3) is in circular arc transition, and the circular arc radius (R2) of the external conical transition is more than or equal to 0.8mm and less than or equal to 2.0 mm; the connecting part of two adjacent inner conical grains (5.4) is in arc transition, the arc radius (R1) of the transition of the inner conical grains is more than or equal to 0.8mm and less than or equal to 2.0mm, and R1 is equal to R2.

8. The horizontal oblique tapered condenser tube heat exchanger according to claim 1, wherein the condenser tubes (5) are installed in a direction corresponding to the direction of fluid flow in the tubes from the small end to the large end of the inner taper (5.4) of the intermediate tube body (5.2).

9. The horizontal oblique-coned condenser tube heat exchanger according to claim 1, wherein the inlet light tube section (5.1) has an outer diameter equal to the maximum outer diameter of the intermediate tube body (5.2); the outer diameter of the outlet light tube section (5.5) is equal to the maximum outer diameter of the middle tube body (5.2).

10. The horizontal oblique-coned condenser tube heat exchanger according to claim 1, wherein the inlet light tube section (5.1) and the outlet light tube section (5.5) are used for connecting the tube sheet (4); the lengths of the inlet light tube section (5.1) and the outlet light tube section (5.5) are set in accordance with the thickness of the tube plate (4).

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