CN104457385B - A tube bundle self-supporting heat exchanger - Google Patents

Abstract

The invention relates to a tube bundle and tube hole plate supporting type heat exchanger which comprises a tube heat exchanger, wherein a heat exchange tube bundle in the tube heat exchanger is mutually supported through a fixing sleeve sleeved outside a single heat exchange tube, and the heat exchange tube bundle is circumferentially supported and fixed through a supporting plate. The fixed sleeve pressing groove is tightly connected with the heat exchange tube. Compared with the prior art, the invention has the beneficial effects that: 1) the medium in the shell pass forms a complex continuous and uniform flow channel between the heat exchange tubes, so that the turbulence degree is improved, the flowing boundary layer is thinned, and the heat transfer resistance is reduced, thereby improving the heat exchange efficiency; 2) the equipment volume is small, and the manufacturing cost is low; 3) no baffle plate is arranged in the shell pass, so that the flow dead zone in the shell pass is eliminated, and the pressure drop of a shell pass medium is reduced: 4) no blind area exists in the shell pass, and scaling is not easy to occur; the flow velocity in the shell side is higher, and the accumulation of impurities in the medium is reduced: 5) the large-area through hole is formed in the pore plate, and compared with the traditional baffle plate, the heat exchange tube is very convenient to mount and dismount.

Description

A tube bundle self-supporting heat exchanger

technical field

The invention relates to a tube heat exchanger, in particular to a tube bundle casing orifice plate supported heat exchanger used for medium heat exchange in the coking industry, which can effectively solve the problem of impurity accumulation and settlement, low heat exchange efficiency and shell side resistance. big and other issues.

Background technique

Tubular (also known as shell-and-tube, shell-and-tube) heat exchanger is the most typical partitioned wall heat exchanger. It has a long history of industrial application and still occupies a dominant position in all heat exchangers. The tubular heat exchanger is mainly composed of a shell, a tube bundle, a tube sheet, and a head. The shell is mostly circular, and parallel tube bundles are installed inside, and both ends of the tube bundle are fixed on the tube sheet.

There are two kinds of fluids that exchange heat in the tube heat exchanger, one flows in the tube, and its stroke is called the tube side; the other flows outside the tube, and its stroke is called the shell side, and the wall of the tube bundle is the heat transfer surface . In order to improve the heat transfer coefficient of the fluid outside the tube, a certain number of transverse baffles are usually installed in the shell. The baffles can not only prevent the short circuit of the fluid, increase the fluid velocity, but also force the fluid to pass through the tube bundle multiple times according to the specified path. greatly increase the degree of turbulence. Commonly used baffles are circular and full circular. Every time the fluid passes through the tube bundle in the tube is called a tube pass, and every time the fluid passes through the shell is called a shell pass. In order to increase the velocity of the fluid in the pipe, partitions are arranged in the heads at both ends to divide all the pipes into several groups evenly. In this way, the fluid can go back and forth multiple times through only part of the tubes at a time, which is called multi-pass. Similarly, in order to increase the flow velocity outside the tube, longitudinal baffles can be installed in the shell to make the fluid pass through the shell space multiple times, which is called multi-shell pass.

Traditional shell-and-tube heat exchangers usually have disadvantages such as low heat transfer efficiency, accumulation of impurities in the shell-side medium, difficulty in cleaning, and complex structure. As the shell-side support tends to be simplified, in recent years, there has been a shell-side self-supporting structure that does not require supports, that is, the tube-side self-supporting structure. At present, the known self-supporting forms of tube bundles include perforated diaphragm type, twisted elliptical tube type, and variable cross-section tube type, etc., but there are generally problems of difficult manufacturing and processing, difficult cleaning, and inconvenient disassembly and maintenance.

Contents of the invention

The invention provides a new type of tube bundle self-supporting heat exchanger, which uses fixed sleeves to realize the support and connection between the support plate and the heat exchange tubes, effectively improves the heat exchange efficiency, reduces the accumulation of impurities on the shell side, and has the advantages of easy Disassembly, maintenance and cleaning, the equipment occupies a small area, and the cost is low.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A tube bundle self-supporting heat exchanger, including a tube heat exchanger, the heat exchange tube bundles in the tube heat exchanger are mutually supported by a fixed sleeve sleeved outside a single heat exchange tube, and the circumferential direction of the heat exchange tube bundle is It is supported and fixed by the support plate.

The length of the fixed sleeve is 1 to 1.5 times the node length of the heat exchange tube, and the fixed sleeve presses grooves adapted to the shape of the heat exchange tube to achieve a tight connection with the heat exchange tube.

The tube heat exchanger is any one of floating head tube heat exchanger, U-shaped tube heat exchanger or fixed tube-sheet heat exchanger, and its tube pass is single tube pass or multi-tube pass.

The support plate is a full circular support plate, and through holes adapted to the outer contour of the heat exchange tube bundle are opened on the support plate, and the opening area is determined according to a single tube pass or multiple tube passes.

The heat exchange tube is any one of a horizontal grooved tube, a threaded grooved tube, a spiral tube, a corrugated tube, a scaling tube or a finned tube.

Compared with prior art, the beneficial effect of the present invention is:

1) The medium in the shell side forms a complex continuous and uniform flow channel between the heat exchange tubes, which increases the degree of turbulence, thins the boundary layer of the flow, reduces the heat transfer resistance, and thus improves the heat exchange efficiency;

2) Due to the improvement of heat exchange efficiency, the heat exchange area can be reduced, and the volume of the equipment will decrease accordingly. In addition, the heat exchanger has no baffles, which greatly reduces its manufacturing cost;

3) Since there is no baffle in the shell side, the heat exchange tubes are mutually supported by the fixed sleeves, and the shell side fluid passes through the gap between the fixed sleeves, thus eliminating the flow dead zone in the shell side and reducing the volume of the shell side medium. pressure drop:

4) Since there is no blind area in the shell side, the heat exchanger is not easy to scale; in addition, the special support structure of the heat exchanger can form a higher flow rate in the shell side, thereby reducing the accumulation of impurities in the medium:

5) A large area of through holes is set on the orifice plate. Compared with the traditional baffle plate, the installation and disassembly of the heat exchange tube is very convenient.

Description of drawings

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

Figure 2 is a schematic diagram of the connection between the support plate and the heat exchange tube bundle.

In the figure: 1. Tube box 2. Tube side material inlet 3. Tube side material outlet 4. Tube box flange 5. Fixed tube plate 6. Cylinder flange 7. Shell side cylinder 8. Shell side material outlet 9. Shell side material inlet 10. Heat exchange tube 11. Saddle 12. Cylinder flange 13. Floating tube plate 14. Outer head cover flange 15. Outer head cover 16. Partition plate 17. Hook ring 18. Floating head flange 19 .floating head 20. fixed sleeve 21. support plate

detailed description

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

See Figure 1, which is a schematic structural diagram of the present invention. A tube bundle self-supporting heat exchanger of the present invention includes a tube heat exchanger. The heat exchange tube bundle in the tube heat exchanger is set on a single heat exchange tube The fixed sleeves 20 outside 10 support each other, and the heat exchange tube bundle is supported and fixed by the support plate 21 in the circumferential direction.

The length of the fixed sleeve 20 is 1 to 1.5 times the length of the nodes of the heat exchange tube 10 , and the fixed sleeve 20 presses grooves adapted to the shape of the heat exchange tube 10 to achieve a tight connection with the heat exchange tube 10 .

The tube heat exchanger is any one of floating head tube heat exchanger, U-shaped tube heat exchanger or fixed tube-sheet heat exchanger, and its tube pass is single tube pass or multi-tube pass.

The support plate 21 is a full circular support plate, and through holes adapted to the outer contour of the heat exchange tube bundle are opened on the support plate 21, and the opening area is determined according to a single tube pass or multiple tube passes.

The heat exchange tube 10 is any one of a horizontally grooved tube, a threaded grooved tube, a spiral tube, a corrugated tube, a scaling tube or a finned tube.

Taking the floating head tube heat exchanger as an example, the overall structure and working principle of the tube bundle self-supporting heat exchanger of the present invention are explained as follows:

As shown in Figure 1, the tube box 1 is connected to the tube box flange 4, and the tube box 1 is provided with a partition plate 16 to divide the tube pass into multiple passes (the number of passes is determined according to the specific situation), and the tube pass material inlet 2, The material outlets 3 of the tube pass are respectively arranged on the upper and lower sides of the front end tube box 1 . The shell-side cylinder 7 is connected to the cylinder flange 6 and the cylinder flange 12, a saddle 11 is provided under the shell-side cylinder 7, and the shell-side material outlet 8 and the shell-side material inlet 9 are respectively arranged on the shell-side cylinder 7 sides. The fixed tube plate 5 is placed between the pipe box flange 4 and the cylinder flange 6 , and the floating tube plate 13 is placed between the hook ring 17 and the floating head flange 18 . Floating head flange 18 links to each other with floating head 19, outer head cover 15 and outer head cover flange flange 14.

The heat exchange tube bundle is fixed between the fixed tube plate 5 and the floating head flange 18, each heat exchange tube 10 is spaced at a certain distance, and the corresponding support plate 21 is provided with a fixed sleeve 20, and the length of the fixed sleeve 20 is not less than the heat exchange tube 10, the length of a wave node, the fixed sleeve 20 is pressed to conform to the shape of the heat exchange tube, and a tight connection is formed between the two, acting on the support plate 21 to realize the self-supporting of the tube bundle. The shell-side fluid flows through the gaps between the fixed sleeves 20 to form complex continuous and evenly distributed flow channels, which effectively improves the heat exchange efficiency. The tube-side medium enters through the tube-side material inlet 2 and leaves through the tube-side material outlet 3 . The shell-side medium enters through the medium inlet 9 and leaves through the medium outlet 8.

See FIG. 2 , which is a schematic diagram of the connection between the support plate 21 and the heat exchange tube bundle. The support plate 21 adopts a full circular orifice plate, and a large-area through hole is opened according to the layout of the heat exchange tube bundle. The outer contour of the through hole is adapted to the overall outer contour of the heat exchange tube bundle. A single heating tube 10 is fitted with a fixed sleeve After 20, a heat exchange tube bundle is formed, and the whole heat exchange tube bundle passes through the through hole of the support plate 21, and the fixed sleeves 20 are in close contact with each other to support each other, forming a self-supporting heat exchange tube bundle structure.

Claims (1)

1. A tube bundle self-supporting heat exchanger, including a tube heat exchanger, characterized in that the heat exchange tube bundles in the tube heat exchanger are mutually supported by a fixed sleeve sleeved outside a single heat exchange tube , the heat exchange tube bundle is supported and fixed by the support plate in the circumferential direction; the length of the fixed sleeve is 1 to 1.5 times the length of the heat exchange tube node, and the fixed sleeve is pressed to match the shape of the heat exchange tube. The tight connection between them; the support plate is a full circular support plate, and a through hole suitable for the outer contour of the heat exchange tube bundle is opened on the support plate, and the opening area is determined according to the single tube pass or multiple tube passes; The tube heat exchanger is a floating head tube heat exchanger, the tube box is connected with the tube box flange, and the tube box is equipped with a partition plate to divide the tube pass into multiple passes, the tube pass material inlet, the tube pass material The outlets are respectively set on the upper and lower sides of the front tube box; the shell side cylinder is connected to the cylinder flange, and a saddle is provided under the shell side cylinder, and the shell side material outlet and shell side material inlet are respectively set on both sides of the shell side cylinder body ;The fixed tube plate is placed between the pipe box flange and the cylinder flange, and the floating tube plate is placed between the hook ring and the floating head flange; the floating head flange is connected with the floating head, the outer head cover and the outer head cover flange; The heat exchange tube bundle is fixed between the fixed tube plate and the floating head flange. Each heat exchange tube is spaced at a certain distance, and the corresponding support plate is provided with a fixed sleeve. The fixed sleeve is pressed to match the shape of the heat exchange tube. A tight connection is formed between them, acting on the support plate, to realize the self-support of the tube bundle; the shell-side fluid flows through the gap between the fixed sleeves, forming complex continuous and evenly distributed flow channels, which effectively improves the heat exchange efficiency; The tube-side medium enters through the tube-side material inlet and leaves through the tube-side material outlet; the shell-side medium enters through the shell-side material inlet and leaves through the shell-side material outlet.