A heat exchanger structure that can improve heat exchange efficiency

Abstract

This utility model relates to a heat exchanger structure that can improve heat exchange efficiency, including: a skirt, a lower end cap, an upper end cap, an intermediate cylindrical section, an upper tube sheet, a lower tube sheet, and a plurality of heat exchange tubes. One free end of each heat exchange tube is welded to the upper tube sheet, and the other free end of each heat exchange tube is welded to the lower tube sheet. A tube-side medium inlet is provided above the upper end cap, and a tube-side medium outlet is provided below the lower end cap. A shell-side medium inlet pipe is provided near the bottom of the heat exchange tubes in the intermediate cylindrical section. A shell-side medium outlet bend is provided above the upper tube sheet and welded to both the upper tube sheet and the intermediate cylindrical section. The diameter of the shell-side medium outlet bend is twice the diameter of the shell-side medium inlet pipe, thereby maximizing the shell side length and improving heat exchange efficiency when the height of the heat exchange tubes is limited.

Description

[Technical Field]

[0001] This utility model relates to the field of heat exchangers, and in particular to a heat exchanger structure that can improve heat exchange efficiency. [Background Technology]

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial production processes. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators, and reboilers, etc.

[0003] Please refer to the prior art (Chinese Patent ZL2018222273601), which discloses a vertical shell-and-tube flexible tube sheet heat exchanger. This type of heat exchanger has good heat exchange efficiency because of its long heat exchange tube design. Its shell-side medium inlet and shell-side medium outlet are respectively located on the side of the shell. However, under some operating conditions, the height of the heat exchanger is limited, and the length of its heat exchange tubes can only be set to be shorter. If the shell-side medium inlet and shell-side medium outlet are still respectively located on the side of the shell when the heat exchange tube length is short, it will result in the shell side being too short, and it will be unable to fully exchange heat with the medium inside the heat exchange tubes.

[0004] Therefore, it is necessary to provide a heat exchanger structure that can improve heat exchange efficiency and solve the above-mentioned technical problems. [Utility Model Content]

[0005] To address the aforementioned problems, the purpose of this invention is to provide a heat exchanger structure that can improve heat exchange efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a heat exchanger structure that can improve heat exchange efficiency, comprising: a skirt, a lower end cap, an upper end cap, an intermediate cylindrical section, an upper tube sheet, a lower tube sheet, and a plurality of heat exchange tubes. One free end of each heat exchange tube is welded to the upper tube sheet, and the other free end of each heat exchange tube is welded to the lower tube sheet. A tube-side medium inlet is provided above the upper end cap, and a tube-side medium outlet is provided below the lower end cap. A shell-side medium inlet pipe is provided near the bottom of the heat exchange tubes in the intermediate cylindrical section. A shell-side medium outlet bend is provided above the upper tube sheet and welded to both the upper tube sheet and the intermediate cylindrical section. The diameter of the shell-side medium outlet bend is twice the diameter of the shell-side medium inlet pipe.

[0007] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that: the number of shell-side medium inlet pipes is three, and the three shell-side medium inlet pipes are evenly distributed along the circumference of the middle cylinder section.

[0008] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the number of shell-side medium outlet bends is two.

[0009] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the two shell-side medium outlet bends are symmetrically arranged.

[0010] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured as follows: the shell-side medium outlet bend includes: a first pipe section welded to the intermediate cylinder section, a flange welded to the outside of the first pipe section, a conical shell section welded to the upper tube sheet, and a corrugated pipe section and a second pipe section connecting the first pipe section and the conical shell section, wherein the conical shell section is wider at the bottom and narrower at the top.

[0011] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the shell-side medium outlet bend is made of stainless steel.

[0012] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the lower end cap, upper end cap, intermediate cylinder section, upper tube sheet, lower tube sheet and several heat exchange tubes are all made of stainless steel.

[0013] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the length of the heat exchange tube is 1600mm.

[0014] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that: a side wall plate type lifting lug is welded on the shell-side medium outlet bend fitting.

[0015] Preferably, the heat exchanger structure of the present invention that can improve heat exchange efficiency is further configured such that the shell-side medium is an HTF mixture.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The heat exchanger in the present invention extends the shell side as much as possible and improves the heat exchange efficiency by setting a shell side medium outlet bend above the upper tube sheet, which is possible when the height of the heat exchange tube is limited. If the shell side medium inlet and shell side medium outlet are both set on the shell body as in the prior art, the shell side will be too short when the height of the heat exchange tube is limited, that is, the shell side medium will exit before it has undergone much heat exchange. Therefore, the present invention solves this technical problem through the above improvement. In addition, the present invention reduces the flow rate of the shell side medium by setting the diameter of the shell side medium outlet bend to twice the diameter of the shell side medium inlet pipe, so that the HTF mixture as the shell side medium can fully react in the shell side. [Attached Image Description]

[0017] Figure 1 This is a schematic structural diagram of the heat exchanger structure in the present utility model.

[0018] Figure 1 In the figure: 1, skirt support; 2, lower head; 20, tube-side medium outlet; 3, upper head; 30, tube-side medium inlet; 4, intermediate cylinder section; 40, shell-side medium inlet pipe; 5, upper tube sheet; 6, lower tube sheet; 7, heat exchange tubes; 8, shell-side medium outlet elbow fitting; 80, first pipe section; 81, flange; 82, conical shell section; 83, bellows section; 84, second pipe section; 9, side wall plate type lifting lug.

Specific Embodiment

[0019] The following further describes in detail a heat exchanger structure capable of improving heat exchange efficiency according to the present utility model through specific embodiments.

[0020] Refer Figure 1 As shown, a heat exchanger structure capable of improving heat exchange efficiency includes: a skirt support 1, a lower head 2, an upper head 3, an intermediate cylinder section 4, an upper tube sheet 5, a lower tube sheet 6, and a plurality of heat exchange tubes 7. In this embodiment, the lower head 2, the upper head 3, the intermediate cylinder section 4, the upper tube sheet 5, the lower tube sheet 6, and the plurality of heat exchange tubes 7 are all made of stainless steel material, so they have good corrosion resistance. The length of the heat exchange tubes 7 is 1600 mm. One free end of the heat exchange tubes 7 is welded to the upper tube sheet 5, and the other free end of the heat exchange tubes 7 is welded to the lower tube sheet 6. A tube-side medium inlet 30 is provided above the upper head 3, and a tube-side medium outlet 20 is provided below the lower head 2. A shell-side medium inlet pipe 40 is provided at the bottom position of the intermediate cylinder section 4 close to the heat exchange tubes 7. In this embodiment, the number of the shell-side medium inlet pipes 40 is three, and the three shell-side medium inlet pipes 40 are evenly distributed along the circumferential direction of the intermediate cylinder section 4. A shell-side medium outlet elbow fitting 8 welded to the upper tube sheet 5 and the intermediate cylinder section 4 respectively is provided above the upper tube sheet 5. In this embodiment, the number of the shell-side medium outlet elbow fittings 8 is two, and the two shell-side medium outlet elbow fittings 8 are symmetrically arranged. The diameter of the shell-side medium outlet elbow fitting 8 is twice the diameter of the shell-side medium inlet pipe 40. Specifically, in this embodiment, the diameter of the shell-side medium inlet pipe 40 is 200 mm, and the diameter of the shell-side medium outlet elbow fitting 8 is 400 mm.

[0021] The shell-side medium outlet bend 8 includes: a first pipe section 80 welded to the intermediate cylinder section 4, a flange 81 welded to the outside of the first pipe section 80, a conical shell section 82 welded to the upper tube sheet 5, and a corrugated pipe section 83 and a second pipe section 84 connecting the first pipe section 80 and the conical shell section 82. The conical shell section 82 is wider at the bottom and narrower at the top. Since the shell-side medium flows inside the shell-side medium outlet bend 8 and the tube-side medium flows outside the shell-side medium outlet bend 8, there is a temperature difference between the shell-side medium and the tube-side medium, which will generate thermal stress. This thermal stress can cause cracking at the weld of the shell-side medium outlet bend 8. Therefore, the corrugated pipe section 83 can effectively absorb and compensate for the thermal expansion and contraction caused by the thermal stress in the shell-side medium outlet bend 8, thus avoiding weld cracking. Furthermore, the conical shell section 82 provides a buffering effect when the shell-side medium enters the shell-side medium outlet bend 8, thereby reducing the impact force of the shell-side medium on the shell-side medium outlet bend 8. In this embodiment, the shell-side medium outlet bend 8 is made of stainless steel, thus possessing good corrosion resistance. Sidewall plate-type lifting lugs 9 are welded onto the shell-side medium outlet bend 8, facilitating the hoisting of the entire heat exchanger. In this embodiment, the shell-side medium is an HTF mixture.

[0022] In summary, the heat exchanger of this invention extends the shell side as much as possible and improves heat exchange efficiency by setting a shell-side medium outlet bend 8 above the upper tube sheet 5, thus maximizing the shell side length despite limited heat exchange tube height. In addition, by setting the diameter of the shell-side medium outlet bend 8 to be twice the diameter of the shell-side medium inlet pipe 40, the flow rate of the shell-side medium can be reduced, allowing the HTF mixture, which is the shell-side medium, to react fully within the shell side.

[0023] The above embodiments are merely illustrative of the principles and effects of this utility model, as well as some of its applications, and are not intended to limit this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A heat exchanger structure capable of improving heat exchange efficiency, comprising: The system comprises a skirt, a lower end cap, an upper end cap, an intermediate cylindrical section, an upper tube sheet, a lower tube sheet, and several heat exchange tubes. One free end of each heat exchange tube is welded to the upper tube sheet, and the other free end of each heat exchange tube is welded to the lower tube sheet. A tube-side medium inlet is located above the upper end cap, and a tube-side medium outlet is located below the lower end cap. The intermediate cylindrical section has a shell-side medium inlet pipe near the bottom of the heat exchange tubes. The upper tube sheet has a shell-side medium outlet bend welded to both the upper tube sheet and the intermediate cylindrical section. The diameter of the shell-side medium outlet bend is twice the diameter of the shell-side medium inlet pipe.

2. The heat exchanger structure of claim 1, wherein: The number of shell-side medium inlet pipes is three, and the three shell-side medium inlet pipes are evenly distributed along the circumference of the middle cylinder section.

3. The heat exchanger structure of claim 1, wherein: The number of shell-side medium outlet bends is two.

4. The heat exchanger structure according to claim 3, wherein: The two shell-side medium outlet bends are symmetrically arranged.

5. The heat exchanger structure of claim 1, wherein: The shell-side medium outlet bend includes: a first pipe section welded to the intermediate cylinder section, a flange welded to the outside of the first pipe section, a conical shell section welded to the upper tube sheet, and a corrugated pipe section and a second pipe section connecting the first pipe section and the conical shell section. The conical shell section is wider at the bottom and narrower at the top.

6. The heat exchanger structure of claim 1, wherein: The shell-side medium outlet bend is made of stainless steel.

7. The heat exchanger structure according to claim 1, wherein: The lower end cap, upper end cap, intermediate cylinder section, upper tube sheet, lower tube sheet, and several heat exchange tubes are all made of stainless steel.

8. The heat exchanger structure according to claim 1, wherein: The length of the heat exchange tube is 1600 mm.

9. The heat exchanger structure of claim 1, wherein: The shell-side medium outlet bend is welded with a side-wall plate type lifting lug.

10. The heat exchanger structure of claim 1, wherein: The shell-side medium is an HTF mixture.

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