CN216869265U

CN216869265U - Plate net type baffle plate device for shell-and-tube heat exchanger

Info

Publication number: CN216869265U
Application number: CN202123091081.5U
Authority: CN
Inventors: 戴敬; 陈健
Original assignee: Shuangliang Eco Energy Systems Co Ltd
Current assignee: Shuangliang Eco Energy Systems Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-07-01
Anticipated expiration: 2031-12-10

Abstract

The utility model relates to a plate mesh type baffle plate device for a shell-and-tube heat exchanger, which comprises a baffle plate, wherein the baffle plate comprises a circular support ring and a plate mesh arranged in the support ring; a plurality of regularly distributed diamond holes are formed in the plate net, and hole bridges are arranged among the diamond holes; the heat exchange tubes penetrate through the rhombic holes on the two sides and are restrained by the hole bridges. The utility model greatly improves the heat exchange efficiency of the heat exchanger, effectively reduces the fluid induced vibration of the heat exchange tube, and furthest reduces the pressure loss of a medium after passing through the shell pass.

Description

Plate net type baffle plate device for shell-and-tube heat exchanger

Technical Field

The utility model relates to the technical field of heat exchangers, in particular to a plate mesh type baffle plate device for a shell-and-tube heat exchanger.

Background

In the industrial field, the heat exchangers are widely used, and in the industries of oil refining, chemical engineering and the like, the heat exchangers can even account for about 40 percent of the total number of equipment, wherein the shell-and-tube heat exchangers are most common. With the development demand of large-scale devices, the amount of a single heat exchanger is larger and larger, and how to improve the efficiency of the heat exchanger, reduce vibration, save energy and improve social benefits is an important topic.

For a shell-and-tube heat exchanger, the methods for improving the heat exchange efficiency are mainly divided into two types, one is to adopt a heat transfer enhancing element such as a finned tube, a high-flux tube, a corrugated tube and the like, and the other is to improve the turbulence degree of a heat exchange medium to improve the heat transfer coefficient. In contrast, each unit is relatively sufficient to research the former, but the method which can be adopted by the latter is relatively limited, mainly aiming at the adjustment of the traditional baffle plate structure, but no matter how the baffle plate is adjusted, dead flow zone, leakage flow and the like can not be avoided, and the problems can cause the reduction of heat transfer efficiency; in order to improve heat transfer, the traditional baffle plate structure needs to ensure that fluid traverses through the tube bundle, which causes high pressure loss of the medium; although new baffle rod type baffle mode has been developed, the improvement of vibration and heat transfer efficiency is not obvious.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and provide a plate mesh type baffle plate device for a shell-and-tube heat exchanger, which improves the heat transfer efficiency of the heat exchanger, reduces the pressure loss of a medium after passing through a shell pass and reduces the vibration of the heat exchange tube caused by fluid induction.

The purpose of the utility model is realized as follows:

a plate mesh type baffle plate device for a shell-and-tube heat exchanger comprises a baffle plate, wherein the baffle plate comprises a circular support ring and a plate mesh arranged in the support ring; a plurality of regularly distributed diamond holes are formed in the plate net, and hole bridges are arranged among the diamond holes; the two baffle plates are connected through a pull rod distance pipe, two ends of the pull rod distance pipe are fixed on the supporting rings on two sides, a plurality of heat exchange pipes penetrate through the two baffle plates, and the heat exchange pipes penetrate through the diamond holes on two sides and are restrained by the hole bridges.

Furthermore, an inclination angle alpha exists between the cross section of the hole bridge and the plane of the plate net, and alpha is 20-70 degrees.

Furthermore, the gap between the hole bridge of the diamond hole and the heat exchange tube is 0.4-0.7 mm.

Furthermore, at least four uniformly distributed pull rod distance pipes are arranged between the two baffle plates.

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

the baffle plate comprises a plate net and a support ring, wherein the plate net is provided with a plurality of diamond holes, hole bridges between the holes deflect at a certain angle, after a heat exchange tube passes through the diamond holes, the hole bridges on the four sides of the holes can press the heat exchange tube to prevent the heat exchange tube from generating displacement vertical to the axial direction, the whole plate net is fixed on the support ring with a slightly smaller diameter than that of the shell, and a reinforcing rib can be arranged in the steel ring if necessary. When the shell-side medium in the shell-and-tube heat exchanger circulates through the gaps around the diamond holes, the turbulent flow is enhanced when the fluid passes through the baffle plate due to the beam action and the angle of the laths among the holes, and the heat transfer efficiency is improved; the medium mainly flows along the heat exchange tube, and does not need to sweep the whole tube bundle transversely like the traditional baffle plate, so that too much resistance cannot be met, and the pressure loss of the medium after passing through the shell pass is very small; in addition, the distance between every two baffling is smaller, and fluid cannot transversely sweep the tube bundle when flowing, so that the vibration of the heat exchange tube is smaller.

When the heat exchange tube passes through the diamond holes, the heat exchange tube can be restrained by the hole bridges, the cross sections of the hole bridges and the plane of the plate mesh form a certain angle, the angle can disturb the flowing state of fluid when the fluid passes through the gap, the heat exchange efficiency of the heat exchanger is greatly improved, the fluid induced vibration of the heat exchange tube is effectively reduced, and the pressure loss of the medium after passing through the shell pass is reduced to the maximum extent.

Drawings

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

Fig. 2 is a schematic cross-sectional view of fig. 1.

Fig. 3 is a partially enlarged view of a portion a of fig. 1.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a schematic structural view of the heat exchanger to which the present invention is applied.

Wherein:

the device comprises a baffle plate 1, a support ring 1.1, a plate net 1.2, diamond holes 1.21, a hole bridge 1.22, a heat exchange tube 2 and a pull rod distance tube 3.

Detailed Description

For a better understanding of the technical aspects of the present invention, reference will now be made in detail to the accompanying drawings. It should be understood that the following specific examples are not intended to limit the embodiments of the present invention, but are merely exemplary embodiments of the present invention. It should be noted that the description of the positional relationship of the components, such as the component a is located above the component B, is based on the description of the relative positions of the components in the drawings, and is not intended to limit the actual positional relationship of the components.

Example 1:

referring to fig. 1-5, fig. 1 depicts a schematic of a plate mesh baffle arrangement for a shell and tube heat exchanger. As shown in the figure, the plate mesh type baffle plate device for the shell-and-tube heat exchanger comprises a baffle plate 1, wherein the baffle plate 1 comprises a circular support ring 1.1 and a plate mesh 1.2 arranged in the support ring 1.1.

A plurality of regularly distributed diamond holes 1.21 are formed in the plate net 1.2, and hole bridges 1.22 are arranged among the diamond holes 1.21; a deflection angle alpha exists between the cross section of the hole bridge 1.22 and the plane of the expanded metal 1.2, and the numerical range of alpha is 20-70 degrees.

The shorter pitch of the diamond holes 1.21 is slightly larger than the outer diameter of the heat exchange tube, so that the heat exchange tube can be restrained by the hole bridges 1.22 after exceeding the diamond holes, and the gap between the hole bridges of the diamond holes 1.21 and the heat exchange tube is 0.4-0.7 mm.

The two baffle plates 1 are connected by a pull rod spacing tube 3, the two ends of the pull rod spacing tube 3 are fixed on the support rings 1.1 at the two sides, and four uniformly distributed pull rod spacing tubes 3 are arranged between the two baffle plates 1.

A plurality of heat exchange tubes 2 penetrate between the two baffle plates 1, and the heat exchange tubes 2 penetrate through diamond holes 1.21 on two sides and are restrained firmly by a hole bridge 1.22 without moving.

The working principle is as follows:

the plate mesh of the baffle plate is punched and formed, the space between the diamond hole bridges of the baffle plate is only slightly larger than the outer diameter of the heat exchange tube, the heat exchange tube can be restrained by the hole bridges after exceeding the diamond holes, the cross sections of the hole bridges and the plane of the plate mesh form a certain angle, and the flowing state of fluid can be disturbed when the fluid passes through the gap. When the plate-net type baffle plates are used in the tube bundle, the baffle plates are connected through the pull rod spacing tubes, the space between the baffle plates is ensured to meet the design requirement, and then the heat exchange tubes sequentially penetrate through the baffle plates from bottom to top.

When the heat exchanger is used, a medium on the shell side flows axially along the heat exchange tube after entering the shell, and when the medium passes through one baffle plate, the medium is disturbed by the baffle plate structure, so that turbulent flow beneficial to heat transfer is formed, and because the structure does not have leakage and dead zones, the heat exchange efficiency is greatly improved. In the process of circulation of the medium in the shell, cross flow resistance of the tube bundle does not exist, and repeated turning effect does not exist, so that the pressure drop of the shell side is very small; in addition, because the medium is longitudinally swept to the tube bundle, vortex shedding, turbulent buffeting and fluid elastic excitation (which causes fluid induced vibration of the tubes in the cross-flow heat exchanger) which cause induced vibration do not exist, and the vibration of the heat exchange tubes is effectively relieved.

The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. A plate mesh type baffle plate device for a shell-and-tube heat exchanger is characterized in that: the baffle plate comprises a baffle plate (1), wherein the baffle plate (1) comprises a circular support ring (1.1) and a plate net (1.2) arranged in the support ring (1.1); a plurality of regularly distributed diamond holes (1.21) are formed in the plate net (1.2), and hole bridges (1.22) are arranged among the diamond holes (1.21); the two baffle plates (1) are connected through the pull rod spacing tube (3), two ends of the pull rod spacing tube (3) are fixed on the support rings (1.1) on two sides, the two baffle plates (1) penetrate through the plurality of heat exchange tubes (2), and the heat exchange tubes (2) penetrate through the diamond holes (1.21) on two sides and are restrained by the hole bridges (1.22).

2. A plate mesh type baffle plate device for a shell-and-tube heat exchanger as claimed in claim 1, wherein: an inclination angle alpha is formed between the cross section of the hole bridge (1.22) and the plane of the plate net (1.2), and the alpha is 20-70 degrees.

3. A plate mesh type baffle plate device for a shell-and-tube heat exchanger as claimed in claim 1, wherein: the gap between the hole bridge of the diamond hole (1.21) and the heat exchange tube is 0.4-0.7 mm.

4. A plate mesh type baffle plate device for a shell-and-tube heat exchanger as claimed in claim 1, wherein: at least four pull rod distance tubes (3) which are uniformly distributed are arranged between the two baffle plates (1).