CN108562179B - Spiral jet flow sleeve heat exchanger and working method thereof - Google Patents

Abstract

The invention relates to a spiral jet flow sleeve heat exchanger and a working method thereof, wherein two ends of an outer tube of the spiral jet flow sleeve heat exchanger are respectively provided with an outer tube upper end plate and an outer tube lower end plate, and two ends of a shell pass channel are sealed; a shell side outlet is formed in one side of the outer tube close to the upper end plate of the outer tube, and a shell side inlet is formed in the other side of the outer tube close to the lower end plate of the outer tube; the inner tube is a spiral fin tube, spiral fins are longitudinally arranged on the periphery of the inner tube, the outer edges of the spiral fins are tightly attached to the inner wall of the outer tube, and a spiral flow passage is formed in the shell pass passage; a plurality of turbulent flow columns are arranged on the outer wall of the inner tube in the spiral flow passage, and a plurality of jet holes are arranged on the spiral fins. In the spiral jet flow sleeve heat exchanger, an inner tube adopts a spiral fin tube, and a turbulent flow element is formed by spiral fins and turbulent flow columns, so that a spiral flow channel and irregular flow between the inner tube and the outer tube are formed; jet holes are also arranged on the spiral fins to form jet flow, so that a flowing boundary layer is destroyed, and the heat transfer effect is improved.

Description

A spiral jet shell and tube heat exchanger and its working method

Technical Field

The invention relates to the technical field of enhanced heat exchange, and in particular to a spiral jet shell and tube heat exchanger and a working method thereof.

Background technique

At present, in the chemical industry, shell and tube heat exchangers are widely used due to their simple structure and ability to bear high pressure. Shell and tube heat exchangers consist of an inner tube and an outer tube. The high-temperature medium and the low-temperature medium transfer heat through the inner tube wall to achieve the purpose of heat exchange. However, the inner and outer tubes of conventional shell and tube heat exchangers are both smooth straight tubes, and there is a lack of turbulent elements between the two. The fluid flows steadily and slowly, and it is difficult to destroy the flow boundary layer, resulting in low heat transfer efficiency.

Summary of the invention

The present invention provides a spiral jet shell and tube heat exchanger and a working method thereof. The inner tube of the spiral jet shell and tube heat exchanger adopts a spiral fin tube. The spiral fins and the spoiler column constitute a spoiler element to form a spiral flow channel and irregular flow between the inner tube and the outer tube. The spiral fins are also provided with jet holes to form a jet, destroy the flow boundary layer, and improve the heat transfer effect.

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

A spiral jet shell and tube heat exchanger comprises a heat exchanger body which is concentrically sleeved with an outer tube and an inner tube, a shell-side channel is formed between the outer tube and the inner tube, and a tube-side channel is formed in the inner tube; both ends of the inner tube extend beyond the corresponding end face of the outer tube, the upper end of the inner tube is the tube-side inlet, and the lower end of the inner tube is the tube-side outlet; an outer tube upper end plate is provided at the upper end of the outer tube, and an outer tube lower end plate is provided at the lower end of the outer tube, and both ends of the shell-side channel are closed by the outer tube upper end plate and the outer tube lower end plate; a shell-side outlet is provided on one side of the outer tube close to the outer tube upper end plate, and a shell-side inlet is provided on the other side of the outer tube close to the outer tube lower end plate; the inner tube is a spiral fin tube, and a spiral fin is provided on its outer periphery in the longitudinal direction, and the outer edge of the spiral fin is in close contact with the inner wall of the outer tube to form a spiral flow channel in the shell-side channel; a plurality of spoiler columns are provided on the outer wall of the inner tube in the spiral flow channel, and a plurality of jet holes are provided on the spiral fin.

The spiral fins are equal-pitch spiral fins, the spoiler columns are evenly arranged in the middle of adjacent spiral fins along the same spiral trajectory, and a plurality of spoiler columns are evenly arranged along the spiral direction.

The jet holes are opened on the spiral fins close to one side of the inner tube, and a plurality of jet holes are evenly opened along the spiral direction of the spiral fins.

The jet hole is a square through hole, a circular through hole, an elliptical through hole or a diamond through hole.

The extended end surface of the spoiler column is closely attached to the inner wall of the outer tube, so as to support the inner tube.

The spoiler column and the jet hole are arranged at intervals along the spiral direction of the spiral fin.

The working method of the spiral jet shell and tube heat exchanger comprises:

1) The tube-side medium enters the shell-and-tube heat exchanger from the tube-side inlet at the upper end of the inner tube, exchanges heat with the shell-side medium through the tube wall of the inner tube, and leaves the shell-and-tube heat exchanger from the tube-side outlet at the lower end of the inner tube;

2) The shell-side medium enters the shell-and-tube heat exchanger from the shell-side inlet, and the contact area with the inner tube is increased by the spiral fins. The shell-side medium moves turbulently in the spiral flow channel formed by the spiral fins. The turbulence of the shell-side medium is promoted by the blocking and turbulent effect of the spoiler column. The shell-side medium is separated and reunited under the blocking of the spoiler column; after mixing with the shell-side medium ejected from the jet hole above the spiral flow channel, a part of it is axially ejected through the jet hole of the spiral flow channel; the other part continues to move in the spiral flow channel, and repeats the above flow process at the next spoiler column and jet hole;

3) The mixed motion of spiral, turbulence and jet forms multiple irregular deflections, which further destroys the flow boundary layer, reduces the heat transfer resistance and enhances the heat transfer effect; after completing the heat transfer, the shell side medium leaves the shell side heat exchanger from the shell side outlet.

Compared with the prior art, the present invention has the following beneficial effects:

1) Using spiral finned tubes as inner tubes increases the heat transfer area of the shell-and-tube heat exchanger, which can increase the heat transfer area per unit mass and effectively reduce the cost of the shell-and-tube heat exchanger;

2) The spiral fins form a rectangular spiral flow channel between the inner tube and the outer tube. The spoiler column can block the regular flow of the fluid and promote strong disturbance of the fluid, thereby reducing the heat transfer resistance and enhancing the heat transfer;

3) The spiral fins are provided with jet holes, which can improve the fluid flow path, increase the axial jet, promote the spiral and axial irregular movement of the fluid in the spiral channel, destroy the heat transfer boundary layer, and further enhance the heat transfer effect;

4) The jet holes and the spoiler columns are arranged at intervals, which is conducive to the smooth operation of the flow path and achieves the effects of spoiler and jet.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a spiral jet shell and tube heat exchanger according to the present invention.

Fig. 2 View A-A in Fig. 1.

FIG. 3 is a schematic diagram of the structure of the inner tube of the present invention.

In the figure: 1. Shell inlet 2. Outer tube lower end plate 3. Inner tube 4. Spiral fin 5. Turbine 6. Outer tube 7. Shell outlet 8. Outer tube upper end plate 9. Jet hole 10. Tube inlet 11. Tube outlet

Detailed ways

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

As shown in Fig. 1 to Fig. 3, a spiral jet shell-and-tube heat exchanger of the present invention comprises a heat exchanger body in which an outer tube 6 and an inner tube 3 are concentrically sleeved together, a shell-side channel is formed between the outer tube 6 and the inner tube 3, and a tube-side channel is formed in the inner tube 3; both ends of the inner tube 3 extend beyond the corresponding end surface of the outer tube 6, the upper end of the inner tube 3 is a tube-side inlet 10, and the lower end of the inner tube 3 is a tube-side outlet 11; an outer tube upper end plate 8 is provided at the upper end of the outer tube 6, an outer tube lower end plate 2 is provided at the lower end of the outer tube 6, and an outer tube upper end plate 8 is provided at the upper end of the outer tube 6. 8 and the lower end plate 2 of the outer tube close the two ends of the shell-side channel; a shell-side outlet 7 is provided on one side of the outer tube 6 close to the upper end plate 8 of the outer tube, and a shell-side inlet 1 is provided on the other side of the outer tube 6 close to the lower end plate 2 of the outer tube; the inner tube 3 is a spiral finned tube, and a spiral fin 4 is provided on its outer periphery along the longitudinal direction, and the outer edge of the spiral fin 4 is close to the inner wall of the outer tube 6 to form a spiral flow channel in the shell-side channel; a plurality of spoiler columns 5 are provided on the outer wall of the inner tube 3 in the spiral flow channel, and a plurality of jet holes 9 are provided on the spiral fin 4.

The spiral fins 4 are spiral fins with equal pitches, and the spoiler columns 5 are evenly arranged in the middle of adjacent spiral fins 4 along the same spiral trajectory, and a plurality of spoiler columns 5 are evenly arranged along the spiral direction.

The jet holes 9 are opened on the spiral fin 4 at one side close to the inner tube 3 , and a plurality of jet holes 9 are evenly opened along the spiral direction of the spiral fin 4 .

The jet hole 9 is a square through hole, a circular through hole, an elliptical through hole or a diamond through hole.

The extended end surface of the spoiler column 5 is in close contact with the inner wall of the outer tube 6 to support the inner tube 3 .

The spoiler column 5 and the jet hole 9 are arranged at intervals along the spiral direction of the spiral fin 4 .

The working method of the spiral jet shell and tube heat exchanger comprises:

1) The tube-side medium enters the shell-and-tube heat exchanger from the tube-side inlet 10 at the upper end of the inner tube 3, exchanges heat with the shell-side medium through the tube wall of the inner tube 3, and leaves the shell-and-tube heat exchanger from the tube-side outlet 11 at the lower end of the inner tube 3;

2) The shell-side medium enters the shell-and-tube heat exchanger from the shell-side inlet 1, and the contact area with the inner tube 3 is increased by the spiral fins 4. The shell-side medium moves turbulently from the spiral flow channel formed by the spiral fins 4, and the turbulence of the shell-side medium is promoted by the blocking and turbulent effect of the spoiler column 5. The shell-side medium is separated and reunited under the blocking of the spoiler column 5; after mixing with the shell-side medium ejected from the jet hole 9 above the spiral flow channel, a part of it is axially ejected through the jet hole 9 of the spiral flow channel; the other part continues to move in the spiral flow channel, and repeats the above flow process at the next spoiler column 5 and jet hole 9;

3) The mixed motion of spiral, turbulent flow and jet forms multiple irregular deflections, which further destroys the flow boundary layer, reduces the heat transfer resistance and enhances the heat transfer effect; after completing the heat transfer, the shell side medium leaves the shell side heat exchanger from the shell side outlet 7.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (4)

1. A spiral jet flow sleeve heat exchanger comprises a heat exchanger body which is formed by concentrically sleeving an outer pipe and an inner pipe, wherein a shell pass channel is arranged between the outer pipe and the inner pipe, and a tube pass channel is arranged in the inner pipe; the device is characterized in that two ends of the inner tube extend out of the corresponding end surfaces of the outer tube, the upper end of the inner tube is a tube side inlet, and the lower end of the inner tube is a tube side outlet; the upper end of the outer tube is provided with an outer tube upper end plate, the lower end of the outer tube is provided with an outer tube lower end plate, and the outer tube upper end plate and the outer tube lower end plate seal the two ends of the shell pass channel; a shell side outlet is formed in one side of the outer tube close to the upper end plate of the outer tube, and a shell side inlet is formed in the other side of the outer tube close to the lower end plate of the outer tube; the inner tube is a spiral fin tube, spiral fins are longitudinally arranged on the periphery of the inner tube, the outer edges of the spiral fins are tightly attached to the inner wall of the outer tube, and a spiral flow passage is formed in the shell pass passage; a plurality of turbulent flow columns are arranged on the outer wall of the inner tube in the spiral flow passage, and a plurality of jet holes are arranged on the spiral fins; the spiral fins are equal-pitch spiral fins, the turbulent flow columns are uniformly arranged between the adjacent spiral fins along the same spiral track, and the turbulent flow columns are uniformly arranged along the spiral direction; the jet holes are formed in the spiral fins close to one side of the inner tube, and the jet holes are uniformly formed in the spiral direction of the spiral fins; the end face of the extending end of the turbulent flow column is tightly attached to the inner wall of the outer tube to support the inner tube.

2. The spiral jet sleeve heat exchanger of claim 1 wherein said jet aperture is a square through-hole, a circular through-hole, an oval through-hole or a diamond-shaped through-hole.

3. The spiral jet sleeve heat exchanger of claim 1 wherein said turbulator posts are spaced apart from the jet holes in the spiral direction of the spiral fins.

4. A method of operating a spiral jet sleeve heat exchanger as set forth in claim 1 including:

1) The tube side medium enters the double-tube heat exchanger from a tube side inlet at the upper end of the inner tube, exchanges heat with the shell side medium through the tube wall of the inner tube, and leaves the double-tube heat exchanger from a tube side outlet at the lower end of the inner tube;

2) The shell side medium enters the double-pipe heat exchanger from the shell side inlet, the contact area between the shell side medium and the inner pipe is increased through the spiral fins, the shell side medium moves in a turbulent way from the spiral flow channel formed by the spiral fins, the turbulence degree of the shell side medium is promoted through the turbulence blocking effect of the turbulence column, and the shell side medium is recombined after being separated under the blocking of the turbulence column; after being mixed with shell side medium flowing down in the jet hole above the spiral flow channel, one part of the shell side medium is subjected to axial jet movement through the jet hole of the spiral flow channel; the other part continues to move in the spiral flow channel, and the flow process is repeated at the position of the next turbulence post and the jet hole;

3) The mixed motion of the spiral, turbulent flow and jet flow forms multiple irregular baffling, so that a flowing boundary layer is further destroyed, the heat transfer resistance is reduced, and the heat transfer effect is enhanced; and the shell-side medium after heat transfer leaves the double-pipe heat exchanger from the shell-side outlet.