CN107990761A - A kind of shell-and-tube heat exchanger of full-circle spray pattern orifice-baffle support axial notch heat exchanger tube - Google Patents

Abstract

The invention discloses a shell-and-tube heat exchanger in which a round orifice plate supports an axially grooved heat exchange tube, which comprises a cylinder body, a tube plate, a round orifice plate and an axially grooved heat exchange tube. The axial groove heat exchange tube is a heat exchange tube with at least two axial grooves distributed along the circumference on the outer surface. The design of the axial groove on the outer surface of the axial groove heat exchange tube makes the Under normal circumstances, the contact area between the fluid and the tube wall increases, thereby increasing the heat transfer area. At the same time, the convex ribs in the tube go deep into the central area of the tube, which strengthens the heat exchange of the fluid in the central area of the tube. This structure can make the heat transfer of the heat exchanger The coefficient has been greatly improved, but the resistance along the way has not increased much. The invention can be applied to industrial heat exchange equipment such as evaporators and heat exchangers, and has broad market application prospects.

Description

A shell-and-tube heat exchanger with a full circular orifice plate supporting axially grooved heat exchange tubes

technical field

The invention belongs to the field of heat transfer equipment, and in particular relates to a shell-and-tube heat exchanger with axial groove heat exchange tubes.

Background technique

The traditional shell-and-tube heat exchanger structure is mainly composed of shell, heat exchange tubes, tube bundle supports, tube sheets at both ends, heads at both ends, shell side and tube side inlet and outlet joints, and the heat exchange tubes have smooth surfaces. The support between the tubes is usually a bow-shaped baffle, and the shell-side fluid flows in an "S" shape, which is prone to flow dead angles, and the heat transfer area cannot be fully utilized, so the shell-side heat transfer coefficient is low and easy to scale , Large fluid resistance. When the fluid flows laterally through the tube bundle, the heat exchange tubes may also generate induced vibrations due to the lateral flow of the fluid, thereby destroying the reliability of the heat exchange tubes and the connection between the heat exchange tubes and the tube sheet. Reference document 1 discloses a shell-and-tube heat exchanger in which square tube holes and round orifice plates replace bow-shaped baffles, and the application number is 2017214306435. The shell-and-tube heat exchanger can make the shell-side fluid flow along the axial direction instead of the traditional "S"-shaped route, eliminate the dead zone of the shell-side fluid flow, avoid the induced vibration caused by the fluid laterally scouring the tube bundle, and can make the The fluid inside and outside the heat exchanger tube flows in pure countercurrent, which increases the heat transfer temperature difference and improves the heat transfer efficiency to a certain extent. However, because the traditional heat exchange tube is a round tube with a smooth surface, the convective heat transfer coefficient of the fluid inside and outside the tube Low.

Contents of the invention

In order to overcome the deficiencies in the prior art, the present invention designs a shell-and-tube heat exchanger with axially grooved heat exchange tubes. The axially grooved heat exchange tubes have at least two The heat exchange tubes with axial grooves can increase the heat transfer area under the same flow cross-sectional area. At the same time, the convex ribs in the tube go deep into the central area of the tube, which strengthens the heat exchange of the fluid in the central area of the tube. This structure can greatly increase the convective heat transfer coefficient while the resistance along the way does not increase much.

The solution of the present invention to solve the technical problem is: a shell-and-tube heat exchanger in which a round orifice plate supports an axially grooved heat exchange tube, including a cylinder body, a tube plate, and a round orifice plate. The plate is fixedly connected to both ends of the cylinder, and a full circular orifice is arranged in the cylinder, the size of the full circular orifice matches the inner diameter of the cylinder, and a plurality of tube holes are arranged in the full circular orifice, The shell-and-tube heat exchanger also includes an axially grooved heat exchange tube arranged in the cylinder, and the axially grooved heat exchange tube is a heat exchange tube with at least two axial grooves distributed along the circumference of the outer surface , the inner surface of the axially grooved heat exchange tube has an axial rib corresponding to the axial groove on the outer surface, the axes of the axially grooved heat exchange tube are parallel, and both ends are fixed between the tube sheets , the full circular orifice plate is perpendicular to the axial groove heat exchange tube, the minimum inner diameter of the tube hole is equal to the maximum outer diameter of the axial groove heat exchange tube, and the axial groove heat exchange tube passes through The tube hole has a gap between the inner edge of the tube hole and the outer wall of the axially grooved heat exchange tube.

As a further improvement of the above technical solution, the tube hole is a square tube hole, a circular tube hole or a special-shaped tube hole.

As a further improvement of the above technical solution, the axially grooved heat exchange tube is formed by extrusion from a round tube made of metal material.

As a further improvement of the above technical solution, the axial ribs on the inner surface of the heat exchange tube are distributed at equal intervals.

As a further improvement of the above technical solution, the tube holes in the full circular orifice plate are distributed at equal intervals.

As a further improvement of the above technical solution, the full circular orifice plate is a plastic material component or a rigid material component.

The beneficial effects of the present invention are: the present invention provides a shell-and-tube heat exchanger with an axial groove heat exchange tube, the outer surface of the axial groove heat exchange tube is distributed with at least two axial grooves along the circumference. The grooved heat exchange tube and the design of the axial groove in the heat exchange tube make the contact area between the shell side fluid and the tube wall increase under the same flow cross-sectional area, thereby increasing the heat transfer area. The axial convex ribs go deep into the center of the tube, which strengthens the heat transfer of the fluid in the center of the tube. This structure can greatly improve the heat transfer coefficient of the heat exchanger, but the resistance along the way does not increase much. The invention can be applied to industrial heat exchange equipment such as evaporators and heat exchangers, and has broad market application prospects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Apparently, the described drawings are only some embodiments of the present invention, not all embodiments, and those skilled in the art can obtain other designs and drawings based on these drawings without creative work.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partial sectional view of the present invention;

Fig. 3 is the structural representation that the tube hole in the tube hole whole circular orifice plate is a square tube hole in the present invention;

Fig. 4 is the structural representation that the tube hole in the tube hole full circular orifice plate is a circular tube hole in the present invention;

Fig. 5 is a schematic structural view of the heat exchange tube with axial grooves in the present invention;

Reference signs:

1. Cylinder body; 2. Tube plate; 3. Axial groove heat exchange tube; 4. Round orifice plate; 301, axial groove; 401, tube hole.

Detailed ways

The idea, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. In addition, all the connection/connection relationships mentioned in this article do not refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions. The various technical features in the invention can be combined interactively on the premise of not conflicting with each other.

Referring to Figures 1-5, a shell-and-tube heat exchanger with axially grooved heat exchange tubes includes a cylinder body 1, a tube plate 2, and a round orifice plate 4. The tube plate 2 and the cylinder body 1 The two ends are fixedly connected, and a round orifice plate 4 is set inside the cylinder body 1. The size of the round orifice plate 4 matches the inner diameter of the cylinder body 1, and a plurality of tube holes are set inside the round orifice plate 4. 401. The shell-and-tube heat exchanger also includes axially grooved heat exchange tubes 3 arranged in the cylinder body 1. The axially grooved heat exchange tubes 3 have a plurality of shafts distributed at equal intervals along the circumference on the outer surface. The heat exchange tube facing the groove 301, the inner surface of the axial groove heat exchange tube 3 has an axial rib corresponding to the axial groove 301 on the outer surface, under the same flow cross-sectional area, the fluid and tube The contact area of the wall increases, thereby increasing the heat transfer area. At the same time, the axial ribs in the tube go deep into the central area of the tube to strengthen the heat exchange of the fluid in the central area of the axial groove heat exchange tube 3. This structure can make convection exchange The thermal coefficient has been greatly improved but the resistance along the way has not increased much. The axes of the axially grooved heat exchange tubes 3 are parallel, and both ends are fixed between the tube plates 2, the full circular orifice plate 4 is perpendicular to the axially grooved heat exchange tubes 3, and the tube holes 401 The minimum inner diameter of the axial groove heat exchange tube 3 is equal to the maximum outer diameter, and the axial groove heat exchange tube 3 passes through the tube hole 401, and the inner edge of the tube hole 401 is between the outer wall of the axial groove heat exchange tube 3 There are gaps between them, so that when the shell-side fluid flows through the gaps, jets can be generated, and even turbulent flow can be formed, thereby increasing the heat transfer coefficient and improving heat transfer efficiency; It has flushing and self-cleaning functions, and can effectively avoid fouling and corrosion under fouling of the axially grooved heat exchange tube 3 .

As a further preferred embodiment, the tube hole 401 is a square tube hole, a circular tube hole or a special-shaped tube hole.

As a further preferred embodiment, the axially grooved heat exchange tube 3 is formed by extrusion of a metal material, the process is simple, and the strength and toughness of the tube are also improved.

As a further preferred embodiment, the axial ribs are distributed at equal intervals, so that the flow of fluid inside and outside the axially grooved heat exchange tubes 3 can be evenly distributed.

As a further preferred embodiment, in order to avoid uneven flow distribution in the casing, the tube holes 401 in the full circular orifice plate are distributed at equal intervals.

Further as a preferred embodiment, the full circular orifice 4 is a plastic material member or a rigid material member, and when the shell side fluid flowing through the tube hole 401 is at normal temperature, the full circular orifice 4 is a plastic material The component is made of plastic material, which can effectively reduce the cost; when the shell side fluid flowing through the tube hole 401 is in a relatively high temperature state, the full circular orifice plate 4 is a rigid material component.

The preferred embodiments of the present invention have been described in detail above, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present invention. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (6)

1. a kind of shell-and-tube heat exchanger of full-circle spray pattern orifice-baffle support axial notch heat exchanger tube, including cylinder, tube sheet, full-circle spray pattern hole Plate, the tube sheet are fixedly connected with the both ends of cylinder, and full-circle spray pattern orifice plate, the size and cylinder of the full-circle spray pattern orifice plate are set in cylinder Internal diameter is adapted, and multiple pores are set in the full-circle spray pattern orifice plate, it is characterised in that：The shell-and-tube heat exchanger, which further includes, is located at cylinder Internal axial notch heat exchanger tube, the axial notch heat exchanger tube circumferentially have at least two axial notches for outer surface Heat exchanger tube, the inner surface of the axial notch heat exchanger tube have and the corresponding axial fin of outer surface axial notch, the axis It is parallel to the axis of groove heat exchange tube, and both ends are fixed between tube sheet, the full-circle spray pattern orifice plate exchanges heat perpendicular to axial notch Pipe, the minimum diameter of the pore is equal with the maximum outside diameter of axial notch heat exchanger tube, and axial notch heat exchanger tube passes through pore, There is gap along between axial notch heat exchange pipe outer wall in pore.

A kind of 2. shell-and-tube heat exchanger with axial notch heat exchanger tube according to claim 1, it is characterised in that：It is described Pore is square pore or circular pore or special-shaped pore.

A kind of 3. shell-and-tube heat exchanger with axial notch heat exchanger tube according to claim 1, it is characterised in that：It is described Axial notch heat exchanger tube is molding by extrusion by metal material pipe.

A kind of 4. shell-and-tube heat exchanger with axial notch heat exchanger tube according to claim 1, it is characterised in that：It is described Axial notch pipe internal surface fin equidistantly distributed.

A kind of 5. shell-and-tube heat exchanger with axial notch heat exchanger tube according to claim 1, it is characterised in that：It is described Pore equidistantly distributed in full-circle spray pattern orifice plate.

A kind of 6. shell-and-tube heat exchanger with axial notch heat exchanger tube according to claim 1, it is characterised in that：It is described Full-circle spray pattern orifice plate is plastic material component or rigid material component.