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Shell-and-tube heat exchanger of vortx net plate support pipe bundle and its forced heat transfer method

A shell-and-tube heat exchanger and swirl network technology, which can be applied to the types of heat exchangers, heat exchanger shells, indirect heat exchangers, etc. Weak heat transfer enhancement effect, etc., to achieve the effect of good heat transfer enhancement effect, good heat transfer enhancement effect, and simple manufacturing

Inactive Publication Date: 2007-08-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many shell-side structures of existing shell-and-tube heat exchangers. For example, the Chinese utility model patent "Axial-flow petal-shaped fin-tube heat exchanger" with the patent number ZL93243442.8 discloses a corrugated long-hole The support plate is used as the shell-side structure of the supporting part between the tubes; the Chinese utility model patent "Support between the tubes of the shell and tube heat exchanger" with the patent number ZL89218385. The shell-side structure of the supporting parts between the tubes; the disturbance of the shell-side supporting parts on the shell side is a lateral disturbance, and the transverse vortex caused by it will decay quickly along the downstream direction of the supporting part between the tube gaps, and cannot transfer heat to the downstream The surface of the tube maintains a long-distance heat transfer enhancement promotion effect. Therefore, the strengthening effect of the support parts between the shell side tubes on the shell side heat transfer is weak, and it mainly relies on the enhanced heat transfer tubes with various rough ribs (such as scaling tubes). , threaded finned tubes and petal-shaped finned tubes, etc.) to improve the shell-side heat transfer film coefficient, because the axial flow velocity of the shell-side fluid is limited by the large flow section, it is not easy to increase, if only rely on the rough rib surface of the enhanced heat transfer tube By using the means, the increase of the shell-side heat transfer film coefficient is not high, generally about 50% compared with the smooth tube; in order to further improve the shell-side heat transfer film coefficient of the shell-side fluid axial flow of the shell-and-tube heat exchanger, It is necessary to further optimize and improve the shell-side flow path of the heat exchanger

Method used

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  • Shell-and-tube heat exchanger of vortx net plate support pipe bundle and its forced heat transfer method
  • Shell-and-tube heat exchanger of vortx net plate support pipe bundle and its forced heat transfer method
  • Shell-and-tube heat exchanger of vortx net plate support pipe bundle and its forced heat transfer method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific structure of the shell-and-tube heat exchanger of the present invention with the swirl screen plate supporting the tube bundle is shown in Figure 1, including the lower head of the heat exchanger 1, the lower tube plate 2, the lower ring sleeve 3, the shell 4, and the swirl net Plate 5, heat transfer tube 6, upper ring sleeve 7, upper head 8, upper tube plate 9, the mutual position and connection relationship of each component is as follows: keep a certain distance between the heat transfer tubes 6 in the radial direction of the shell side Connected to the swirl screen 5, the gap between the heat transfer tubes 6 is limited by the swirl screen 5, the swirl screen 5 is evenly distributed along the axial direction of the shell, and the upper and lower ends of the heat transfer tubes 6 are respectively It is welded to the upper and lower tube plates 9, 2, the upper and lower ring sleeves 7, 3 are respectively welded to the upper and lower tube plates 9, 2 and t...

Embodiment 2

[0025] This embodiment is the same as Embodiment 1 except for the following technical features: the structure of the swirling screen 5 is shown in Figure 4, including a screen frame 5-1, a vertical support bar 5-2, and a transverse support bar 5-3 . The swirl member 5-4, the longitudinal support bar 5-2 and the transverse support bar 5-3 are pasted together and welded at the axially intersecting position, and the swirl member 5-4 is welded to the longitudinal support bar 5-2 One side is only connected with the longitudinal support bar 5-2.

Embodiment 3

[0027] This embodiment is the same as Embodiment 1 except for the following technical features: the shape and structure of the swirling screen 5 is as shown in Figure 6, including a screen frame 5-1, repeated fold line support bars 5-5, and support bars between fold lines 5-6. The swirl member 5-4, the repeated broken line support bar 5-5 is fixedly connected with the screen frame 5-1, and a connecting broken line support bar is added between two adjacent repeated broken line support bars 5-5 5-6 forms a net plate, and the repeated broken line support bar 5-5 is connected with the broken line support bar 5-6 to form a honeycomb (regular hexagonal) grid; the swirl member 5-4 is connected to the repeated broken line support bar 5 -5 and the connection point of the support bar 5-6 between the broken lines. The heat transfer tube 6 passes through the regular hexagon formed by the repeated folding line support bar 5-5 and the inter-fold line support bar 5-6 and is tangent to the ci...

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PUM

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Abstract

The invention provides a shell and tube heat exchanger of roational flow shadow masking supporting tube bundle, comprising shell, heat transmission tube, heat transmission tube, shoe plate and tube plate. The tube plate are set on two ends in the shell and between them is the shoe plate; the heat transmission tube is linked to the tube plate across the shoe plate; the shoe plate is roational flow shadow masking supporting whereon member is installed; the roational flow member with helix angle is helix slice whose axial directional shape is circularity. The tube heat exchanger makes roational flow accelerate by stages to fluid flowing through gap of pipe by using the roational flow member to form longitudinal self-roational flow which can last for a long distance, raising marginal rate of the fluid in the gap of pipe, so that fluid flowing speed near the heat transmission tube shell surface is raised effectively, film heat transfer coefficient of shell pass is raised a lot and shell pass is strengthened.

Description

technical field [0001] The invention relates to the shell-and-tube heat exchanger technology, in particular to a shell-and-tube heat exchanger with supporting parts between tubes and a method for enhancing heat transfer. Background technique [0002] There are many shell-side structures of existing shell-and-tube heat exchangers. For example, the Chinese utility model patent "Axial-flow petal-shaped fin-tube heat exchanger" with the patent number ZL93243442.8 discloses a corrugated long-hole The support plate is used as the shell-side structure of the supporting part between the tubes; the Chinese utility model patent "Support between the tubes of the shell and tube heat exchanger" with the patent number ZL89218385. The shell-side structure of the supporting parts between the tubes; the disturbance of the shell-side supporting parts on the shell side is a lateral disturbance, and the transverse vortex caused by it will decay quickly along the downstream direction of the supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D1/04F28F9/013
Inventor 邓先和张亚君潘朝群王杨君
Owner SOUTH CHINA UNIV OF TECH