CN217818277U

CN217818277U - Tubular heat exchanger

Info

Publication number: CN217818277U
Application number: CN202221013367.3U
Authority: CN
Inventors: 董星辰; 冯建光; 徐浩淞; 徐斐; 肖礼; 谭永嘉; 王涛
Original assignee: Huaneng Chongqing Luohuang Power Generation Co Ltd
Current assignee: Huaneng Chongqing Luohuang Power Generation Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-11-15
Anticipated expiration: 2032-04-28

Abstract

The utility model provides a tubular heat exchanger, including cylindric casing, baffle and tube bank, the casing both ends are provided with cold fluid import and cold fluid outlet respectively, the tube bank sets up in the casing, with casing axial direction parallel arrangement be provided with hot-fluid import and hot-fluid outlet on the casing section of thick bamboo wall, the hot-fluid import sets up in being close to cold fluid outlet side, the hot-fluid outlet sets up in being close to cold fluid inlet side, the baffle sets up in the casing, sets up with casing axial direction is perpendicular, the tube bank wear in the baffle and with cold fluid import and cold fluid outlet intercommunication to seal with the baffle and form the heat transfer chamber, heat transfer chamber and hot-fluid import and hot-fluid outlet intercommunication, the tube bank includes a plurality of bodies that the pipe diameter is different. Compared with the prior art, the utility model can improve the heat transfer ability of heat exchanger to easily manufacturing.

Description

Tubular heat exchanger

Technical Field

The utility model relates to a thermal power technology field, concretely relates to tubular heat exchanger.

Background

The tubular heat exchanger is the most typical dividing wall type heat exchanger and mainly comprises a shell, a tube bundle, a tube plate, a seal head and the like, wherein the shell is mostly circular, the parallel tube bundle is arranged in the shell, and two ends of the tube bundle are fixed on the tube plate.

Most diameters of tube bundles of the existing tube type heat exchanger are equal, but because the inside of the heat exchanger flows complicatedly, heat exchange coefficients of different places are different, and if the tube diameters are the same, partial local heat exchange capacity is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a tubular heat exchanger, including cylindric casing, baffle and tube bank, the casing both ends are provided with cold fluid import and cold fluid export respectively, the tube bank sets up in the casing, with casing axial direction parallel arrangement be provided with hot-fluid import and hot-fluid export on the casing section of thick bamboo wall, the hot-fluid import sets up in being close to cold fluid outlet side, the hot-fluid export sets up in being close to cold fluid import side, the baffle sets up in the casing, sets up with casing axial direction is perpendicular, the tube bank wear in the baffle and with cold fluid import and cold fluid export intercommunication to seal with the baffle and form heat transfer chamber, heat transfer chamber and hot-fluid import and hot-fluid export intercommunication, the tube bank includes a plurality of bodies that the pipe diameter is different.

In one embodiment, the baffle comprises a first end plate, a second end plate, a first meniscus baffle and a second meniscus baffle, the first end plate is arranged near the cold fluid inlet end of the shell, the second end plate is arranged near the cold fluid outlet end of the shell, the first meniscus baffle and the second meniscus baffle are alternately arranged between the first end plate and the second end plate along the axial direction of the shell at intervals, wherein the first meniscus baffle and the second meniscus baffle are half-moon-shaped baffles, the first meniscus baffle and the second meniscus baffle are symmetrically and oppositely arranged in the radial direction of the shell, and the first end plate and the second end plate and the tube bundle are sealed to form a heat exchange cavity.

In one embodiment, the first meniscus baffle and the second meniscus baffle have an area greater than one half of the circumferential cross-sectional area of the housing.

In one embodiment, the tube body is provided with a plurality of turns from inside to outside.

In one embodiment, the tubes form a multi-turn regular hexagonal arrangement.

In one embodiment, the diameter of the outermost turn of tubes in the tube bundle near the hot fluid inlet side is larger than the diameter of the inner turn of tubes.

In one embodiment, the diameter of the outermost tubes on both sides of the thermal fluid inlet and the thermal fluid outlet in the tube bundle is larger than the diameter of the inner tubes and larger than the diameter of the tubes near the thermal fluid outlet.

In one embodiment, the plurality of tubes in the tube bundle are evenly spaced.

In one embodiment, the tube diameter of the tube bundle is gradually increased from the inside to the outside.

In one embodiment, the adjacent spaces between the tubes in the tube bundle decrease from the inside to the outside.

Compared with the prior art, the utility model can improve the heat transfer ability of heat exchanger to easily manufacturing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.

Fig. 1 is a perspective view of a tubular heat exchanger according to the present invention;

FIG. 2 is a schematic view of the arrangement of the tube bundle in one embodiment of the present invention;

fig. 3 is a schematic view of the arrangement of the tube bundle in another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The utility model provides a tubular heat exchanger, as shown in fig. 1, including cylindric casing 10, baffle and tube bank 30, casing 10 both ends are provided with cold fluid import 11 and cold fluid export 12 respectively, and tube bank 30 sets up in casing 10, has a plurality of bodys with casing 10 axial direction parallel arrangement. A hot fluid inlet 13 and a hot fluid outlet 14 are arranged on the cylinder wall of the shell 10, the hot fluid inlet 13 is arranged on the side close to the cold fluid outlet 12, and the hot fluid outlet 14 is arranged on the side close to the cold fluid inlet 11. The baffle is arranged in the shell 10 and is axially and vertically arranged with the shell 10, the tube bundle 30 penetrates through the baffle to be communicated with the cold fluid inlet 11 and the cold fluid outlet 12 and is sealed with the baffle to form a heat exchange cavity, and the heat exchange cavity is communicated with the hot fluid inlet 13 and the hot fluid outlet 14. Wherein the tube bundle 30 comprises a plurality of tubes of different tube diameters.

Therefore, the arrangement of the pipe diameter of the pipe bundle 30 can effectively disturb the local flow velocity of the fluid in the heat exchange cavity, and particularly, when the hot fluid with a high viscosity coefficient is treated, the laminar heat exchange state can be broken, so that the turbulent flow is formed, the laminar layer can be broken, and the heat exchange efficiency of the hot fluid and the pipe bundle 30 is improved.

The baffle plates include a first end plate 21, a second end plate 22, a first meniscus baffle plate 23 and a second meniscus baffle plate 24. A first end plate 21 is arranged at the end of the shell 10 close to the cold fluid inlet 11, a second end plate 22 is arranged at the end of the shell 10 close to the cold fluid outlet 12, a first half-moon baffle 23 and a second half-moon baffle 24 are alternately arranged between the first end plate 21 and the second end plate 22 along the axial direction of the shell 10 at intervals, wherein the first half-moon baffle 23 and the second half-moon baffle 24 are half-moon baffles, namely, the first half-moon baffle 23 and the second half-moon baffle 24 are not completely closed to the radial section of the shell 10, and the first half-moon baffle 23 and the second half-moon baffle 24 are symmetrically and oppositely arranged in the radial direction of the shell 10. The first end plate 21 and the second end plate 22 are closed with the tube bundle 30 to form a heat exchange chamber. Therefore, after the hot fluid flows into the heat exchange cavity through the hot fluid inlet 13, the first half-moon baffle 23 and the second half-moon baffle 24 alternately block the flow direction, an S-shaped circuitous flow path is formed in the heat exchange cavity, a large vortex is formed at the corner of the flow path, a laminar boundary layer is favorably washed away, and the heat exchange efficiency is improved. In particular, in one embodiment, the first and

second meniscus baffles

23 and 24 have an area greater than one-half the circumferential cross-sectional area of the shell 10 to extend the circuitous path of the hot fluid and enhance heat exchange.

In one embodiment, the tube bundle 30 is arranged as shown in fig. 2, and includes a plurality of tubes arranged in a regular hexagon, and the plurality of tubes has a plurality of turns from inside to outside, 3 turns in fig. 2, or 4 turns, 5 turns, etc., depending on the specific installation environment. The regular hexagonal arrangement may facilitate manufacturing assembly and alignment for installation.

Wherein, the diameter of the outermost circle of pipe body close to the hot fluid inlet 13 side is larger than the diameter of the inner circle of pipe body. Therefore, the hot fluid flows into the heat exchange cavity and then exchanges heat in advance through the outermost circle of large-diameter pipe body, the Bernoulli principle shows that the flow speed of the cooling liquid in the large-diameter pipe body is slower than that of the small-diameter pipe body in a non-ideal state, namely, in a real state, the heat exchange quantity of the cooling liquid in the large-diameter pipe body per unit volume is smaller than that of the small-diameter pipe body, and therefore the gradual change of the heat exchange quantity per unit volume from low to high after the hot fluid flows in can be achieved, entropy increase is reduced, and the heat exchange efficiency is improved.

Further, the diameter of the outermost tube in the tube bundle 30 near the hot fluid inlet 13 and the hot fluid outlet 14 is larger than the diameter of the inner tube and larger than the diameter of the tube near the hot fluid outlet 14. To ensure that the lower final pressure loss and adequate heat exchange is required close to the hot fluid outlet 14.

Further, a plurality of tubes in tube bundle 30 are arranged at even intervals, that is, the intervals between a plurality of tubes are basically the same, so that the number of tubes in each circle is required to be set according to the length of the side of the regular hexagon with different circle layers, so that the intervals between a plurality of tubes are basically the same. And then when aiming at high viscosity fluid, can relatively stabilize fluid pressure, avoid great pressure loss, and then take place the problem such as long-pending silt.

In one embodiment, bundle 30 is arranged as shown in FIG. 3, and in this embodiment, bundle 30 has a gradually increasing tube diameter from the inside to the outside relative to FIG. 2. Thereby further improving the turbulence and the heat exchange efficiency.

Further, the proximity spacing between the tubes in tube bundle 30 decreases from the inside to the outside. The hot fluid flows through the area near the interval between the pipe bodies, the interval is small, the flow area is small, the flow speed is increased, the turbulence degree is high, the interval is large, the flow speed is reduced, and the residence time of the hot fluid is prolonged. Therefore, the combined pipe diameter is gradually increased from inside to outside, high flow speed and high turbulence are realized when hot fluid is formed in the outer ring pipe body, and the cooling liquid is low in flow speed and high in flow rate in the outer ring pipe body; the hot fluid has low flow speed when the pipe body is arranged at the inner ring, and the cooling liquid has high flow speed and high turbulence when the pipe body is arranged at the inner ring. Realize the inverse difference heat exchange of cold and hot fluid, and is favorable for enhancing the heat exchange. Meanwhile, the gradually changed pipe diameter enables the pressure and the flow rate of the hot fluid to be gradually changed periodically, so that the turbulence degree is improved, and the pressure loss is reduced.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of this invention without departing from the spirit thereof.

Claims

1. A tubular heat exchanger comprises a cylindrical shell, a baffle plate and a tube bundle,

a cold fluid inlet and a cold fluid outlet are respectively arranged at the two ends of the shell,

the tube bundle is arranged in the shell and is axially parallel to the shell,

a hot fluid inlet and a hot fluid outlet are arranged on the wall of the shell body, the hot fluid inlet is arranged near the outlet side of the cold fluid, the hot fluid outlet is arranged near the inlet side of the cold fluid,

the baffle is arranged in the shell and is axially and vertically arranged with the shell,

the tube bundle penetrates through the baffle plate, is communicated with the cold fluid inlet and the cold fluid outlet and is sealed with the baffle plate to form a heat exchange cavity, the heat exchange cavity is communicated with the hot fluid inlet and the hot fluid outlet,

the tube bundle comprises a plurality of tubes of different tube diameters.

2. A tubular heat exchanger according to claim 1,

the baffle plate comprises a first end plate, a second end plate, a first semilunar baffle plate and a second semilunar baffle plate,

a first end plate is disposed in the housing adjacent the cold fluid inlet end,

a second end plate is arranged on the shell close to the cold fluid outlet end,

first meniscus baffles and second meniscus baffles are alternately arranged between the first end plate and the second end plate along the axial direction of the shell at intervals,

wherein the first semilunar baffle and the second semilunar baffle are half-moon shaped baffles, and the first semilunar baffle and the second semilunar baffle are symmetrically and oppositely arranged in the radial direction of the shell,

the first end plate and the second end plate and the tube bundle are sealed to form a heat exchange cavity.

3. A tubular heat exchanger according to claim 2,

the first meniscus baffle and the second meniscus baffle have an area greater than one-half of the circumferential cross-sectional area of the housing.

4. A tubular heat exchanger according to any one of claims 1 to 3,

the tube body is provided with a plurality of circles from inside to outside.

5. A tubular heat exchanger according to claim 4,

the tube bodies are arranged in a plurality of circles in a regular hexagon.

6. A tubular heat exchanger according to claim 4,

the diameter of the outermost circle of pipe bodies close to the hot fluid inlet side in the pipe bundle is larger than that of the inner circle of pipe bodies.

7. A tubular heat exchanger according to claim 4,

the diameter of the outermost ring of the pipe bodies close to the hot fluid inlet and the hot fluid outlet in the pipe bundle is larger than that of the inner ring of the pipe body and is larger than that of the pipe bodies close to the hot fluid outlet.

8. A tubular heat exchanger according to any one of claims 5 to 7,

a plurality of tubes in the tube bundle are arranged at even intervals.

9. A tubular heat exchanger according to claim 4,

the diameter of the tube body in the tube bundle is gradually increased from inside to outside.

10. A tubular heat exchanger according to claim 9,

the adjacent space between the tubes in the tube bundle is gradually reduced from inside to outside.