CN220170034U - Tube type heat exchanger for heat treatment furnace - Google Patents

Abstract

The utility model discloses a tubular heat exchanger used on a heat treatment furnace, which comprises a shell (1), a first outlet (2), a first inlet (3), a second inlet (4), a second outlet (5), an inlet pipeline (7), an outlet pipeline (8), a first limiting plate (11), a second limiting plate (12), a control assembly (16) and a partition plate (18); the shell is of a hollow closed structure, and the first limiting plate and the second limiting plate are arranged in the shell and divide the shell into a tube side entering cavity, a shell side cavity and a tube side discharging cavity which are mutually independent in sequence; the partition plate is arranged in the tube side entering cavity and divides the tube side entering cavity into a first channel (101) and a second channel (102) which are mutually independent, and the control component is arranged in the shell side cavity and is movably connected with a plurality of entering pipelines. The utility model can solve the problem of energy waste in the heat exchange process caused by the fact that the heat exchange speed cannot be changed according to actual requirements in the prior art.

Description

Tube type heat exchanger for heat treatment furnace

Technical Field

The utility model relates to heat exchange equipment, in particular to a tubular heat exchanger used on a heat treatment furnace.

Background

Two fluids which exchange heat in the tube heat exchanger, one fluid flows in the tube, and the stroke of the fluid is called tube side; the other type of flow outside the tube, the travel of which is called shell pass, the walls of the tube bundle being the heat transfer surfaces. In order to improve the heat supply coefficient of the fluid outside the tube, a certain number of transverse baffle plates are usually arranged in the shell, so that the baffle plates can not only prevent the fluid from being shorted out and increase the fluid speed, but also force the fluid to cross-flow through the tube bundle for a plurality of times according to a specified path, and the turbulence degree is greatly increased. In practical application, the heat exchange effect between the first heat exchange medium and the second heat exchange medium in the traditional tubular heat exchanger is poor, and when the temperature of the first heat exchange medium needs to be greatly increased or reduced, the lengths of the outer tube body and the inner tube body generally need to be increased, the steps are too complicated, and the operation is inconvenient.

In order to cope with the above problems, chinese patent No. CN208887424U discloses a tubular heat exchanger, in which a first heat exchange medium enters a first U-shaped tube from a third inlet and outlet connector, the first U-shaped tube sends the first heat exchange medium into a third space through a first circulation outlet through hole, the first circulation inlet through hole enters a second U-shaped tube, the second U-shaped tube sends the first heat exchange medium into a second space, and finally the first heat exchange medium is discharged from a fourth inlet and outlet connector; the second heat exchange medium flows into the outer tube shell from the second inlet and outlet joint and flows out of the outer tube shell from the first inlet and outlet joint.

The heat exchange between the tubular heat exchanger and the second medium can be improved by arranging the S-shaped pipeline to increase the flow area of the first heat exchange medium, but the S-shaped channel of the tubular heat exchanger is a fixed channel, so that the speed of heat exchange cannot be changed according to the actual heat exchange requirement in actual operation, and the energy waste in the heat exchange process is caused. Therefore, it is necessary to provide a tubular heat exchanger for a heat treatment furnace, which can solve the problem of energy waste in the heat exchange process caused by the fact that the heat exchange speed cannot be changed according to actual requirements in the prior art.

Disclosure of Invention

The utility model aims to provide a tubular heat exchanger for a heat treatment furnace, which can solve the problem of energy waste in the heat exchange process caused by the fact that the heat exchange speed cannot be changed according to actual requirements in the prior art.

The utility model is realized in the following way:

a tubular heat exchanger used on a heat treatment furnace comprises a shell, a first outlet, a first inlet, a second outlet, an inlet pipeline, an outlet pipeline, a first limiting plate, a second limiting plate, a control assembly and a separation plate; the shell is of a hollow closed structure, and the first limiting plate and the second limiting plate are respectively arranged in the shell and divide the shell into a tube side inlet chamber, a shell side chamber and a tube side discharge chamber which are mutually independent in sequence; the partition plate is arranged in the tube side entering cavity and divides the tube side entering cavity into a first channel and a second channel which are mutually independent, the plurality of entering pipelines are respectively arranged in the shell side cavity at intervals, one end of each of the plurality of entering pipelines penetrates through the first limiting plate and is communicated with the second channel, and the other end of each of the plurality of entering pipelines penetrates through the second limiting plate and is communicated with the tube side discharging cavity; one end of each of the plurality of discharge pipelines penetrates through the first limiting plate and is communicated with the first channel, and the other end of each of the plurality of discharge pipelines penetrates through the second limiting plate and is communicated with the tube side discharge chamber; the first outlet is arranged on the shell and communicated with the first channel, and the first inlet is arranged on the shell and communicated with the second channel; the second inlet and the second outlet are respectively arranged on the shell and are communicated with the shell side cavity; the control component is arranged in the shell side cavity and is movably connected with a plurality of inlet pipelines.

The control assembly comprises a control screw rod, a movable rod and a movable piece; two ends of the control screw rod are respectively rotatably arranged on the first limiting plate and the second limiting plate and penetrate through the shell side cavity, and the movable piece is screwed on the control screw rod; one end of the movable rod is hinged on the movable piece, and the other end of the movable rod is hinged on the inlet pipeline; the movable rods are arranged at intervals along the circumferential direction of the movable piece, and are respectively and correspondingly connected with a plurality of inlet pipelines in the circumferential direction of the control screw.

The plurality of the inlet pipelines are circumferentially distributed around the control screw in multiple layers, and two adjacent inlet pipelines positioned on the same straight line are connected through the connecting plate.

The two ends of the plurality of the inlet pipelines are connected with sliding blocks, sliding grooves capable of sliding and embedding the sliding blocks are formed in the first limiting plates and the second limiting plates, one ends of the plurality of the inlet pipelines are in sliding sealing connection with the first limiting plates through the sliding blocks, and the other ends of the plurality of the inlet pipelines are in sliding sealing connection with the second limiting plates through the sliding blocks.

The first limiting plate positioned in the first channel is provided with a plurality of first through holes for being communicated with the discharge pipeline, and the second limiting plate is provided with a plurality of second through holes for being communicated with the discharge pipeline at positions opposite to the first through holes on the first limiting plate.

A plurality of baffles are arranged in the shell side chamber at intervals, and the baffles are positioned between the second inlet and the second outlet; the baffle is of a circular-notch structure, so that a circulation gap is reserved between the baffle and the inner wall of the shell.

The edge of one baffle is connected with the middle lower part of the inner wall of the shell in a sealing way, and the edges of two adjacent baffles are connected with the middle upper part of the inner wall of the shell in a sealing way; similarly, the edge of one baffle is connected with the middle upper part of the inner wall of the shell in a sealing way, and the edges of two adjacent baffles are connected with the middle lower part of the inner wall of the shell in a sealing way, so that an S-shaped channel is formed in the shell side cavity through the circulation gaps of the plurality of baffles.

The baffle plates are provided with limiting grooves, and the control screw and the inlet pipelines penetrate through the baffle plates through the limiting grooves.

The two ends of the shell are respectively provided with a first flange and a second flange, a closed tube side inlet chamber is formed between the first flange and the first limiting plate, and a closed tube side outlet chamber is formed between the second flange and the second limiting plate; the housing is mounted on the heat treatment furnace by a first flange and a second flange.

The second inlet and the second outlet are arranged along a diagonal of the shell side chamber.

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

1. the utility model is provided with the control assembly, the movable piece is driven to move along the axial direction of the control screw rod through the rotation of the control screw rod, so that the movable rod which can rotate is hinged to drive the inlet pipelines around the control screw rod to expand, disperse or shrink and gather, and simultaneously, the connecting plate drives all the inlet pipelines of the outer ring to synchronously expand, disperse or shrink and gather, so that the flow path, the flow time and the flow speed of the second medium in the shell side cavity are changed, different heat exchange efficiency requirements are met, and the problems of poor heat exchange effect and heat exchange energy waste between the first medium and the second medium caused by the fixation of the internal channel in the prior art are avoided.

2. The baffle plates, the sliding blocks and the sliding grooves are arranged at intervals, so that S-shaped channels are formed in the shell side cavity, the flow time and the flow path of the second medium are prolonged, the contact area and the contact time of the second medium with the inlet pipeline and the outlet pipeline are increased, and the heat exchange efficiency is improved; meanwhile, the arrangement and the movement of the inlet pipeline are guaranteed through the limit grooves on the baffle plate and the sliding fit of the sliding blocks and the sliding grooves, and the relative independent flow of the first medium and the second medium is guaranteed, so that the normal operation of the tubular heat exchanger is guaranteed.

Drawings

FIG. 1 is a perspective view of a tube heat exchanger for use in a heat treatment furnace according to the present utility model;

FIG. 2 is a schematic view showing the internal structure of a tube heat exchanger for use in a heat treatment furnace according to the present utility model;

FIG. 3 is a schematic view of the baffle, first limiting plate, inlet conduit, outlet conduit, control assembly of the tubular heat exchanger for use in a heat treatment furnace according to the present utility model;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

fig. 5 is an enlarged schematic view at B in fig. 3.

In the figure, 1, a shell; 101. a first channel; 102. a second channel; 2. a first outlet; 3. a first inlet; 4. a second inlet; 5. a second outlet; 6. a first flange; 601. a second flange; 7. entering a pipeline; 8. a discharge pipe; 9. a baffle; 901. a limit groove; 10. a control screw; 11. a first limiting plate; 12. a second limiting plate; 13. a first hinge; 14. a movable rod; 15. a second hinge; 16. a control assembly; 17. a slide block; 18. a partition plate; 19. a connecting plate; 20. a movable member; 111. and a sliding groove.

Detailed Description

The utility model will be further described with reference to the drawings and the specific examples.

Referring to fig. 1 and 2, a tube heat exchanger for a heat treatment furnace includes a housing 1, a first outlet 2, a first inlet 3, a second inlet 4, a second outlet 5, an inlet pipe 7, an outlet pipe 8, a first limiting plate 11, a second limiting plate 12, a control assembly 16, and a partition plate 18; the shell 1 is of a hollow closed structure, and the first limiting plate 11 and the second limiting plate 12 are respectively arranged in the shell 1 and sequentially divide the shell 1 into a tube side inlet chamber, a shell side chamber and a tube side discharge chamber which are mutually independent; the partition plate 18 is arranged in the tube side entering cavity and divides the tube side entering cavity into a first channel 101 and a second channel 102 which are mutually independent, the plurality of entering pipelines 7 are respectively arranged in the shell side cavity at intervals, one end of each entering pipeline 7 penetrates through the first limiting plate 11 and is communicated with the second channel 102, and the other end of each entering pipeline 7 penetrates through the second limiting plate 12 and is communicated with the tube side discharging cavity; one end of each of the plurality of discharge pipelines 8 penetrates through the first limiting plate 11 and is communicated with the first channel 101, and the other end of each of the plurality of discharge pipelines 8 penetrates through the second limiting plate 12 and is communicated with the tube side discharge chamber; the first outlet 2 is arranged on the shell 1 and is communicated with the first channel 101, and the first inlet 3 is arranged on the shell 1 and is communicated with the second channel 102; the second inlet 4 and the second outlet 5 are respectively arranged on the shell 1 and are communicated with the shell side chamber; the control assembly 16 is arranged in the shell side chamber and is movably connected with a plurality of inlet pipes 7.

The first medium enters the first channel 101 through the first inlet 3, then enters one end of a plurality of inlet pipelines 7 through the first channel 101, flows through the plurality of inlet pipelines 7 and then enters the tube side discharge cavity, flows into the other end of a plurality of discharge pipelines 8 from the tube side discharge cavity, flows through the plurality of discharge pipelines 8 and then enters the second channel 102, and then is discharged from the first outlet 2, so that one tube side is completed.

The second medium enters the shell-side chamber through the second inlet 4 and exits the shell-side chamber through the second outlet 5, completing a shell-side.

The medium heat exchange process of the tubular heat exchanger on the heat treatment furnace is realized through a plurality of tube passes and shell passes, in the medium heat exchange process, a plurality of inlet pipelines 7 are driven to expand, disperse or shrink and gather according to heat exchange requirements through the control assembly 16, so that the flow path and speed of a second medium in a shell pass cavity are changed, the contact area of the second medium and the inlet pipelines 7 is changed, the first medium and the second medium are enabled to exchange heat fully, the required heat exchange efficiency is achieved, and the energy waste in the heat exchange process is reduced.

In order to ensure the expansion dispersion or contraction gathering function of the inlet pipe 7, the inlet pipe 7 may be made of a material with a certain deformation performance, such as rubber.

Referring to fig. 4, the control assembly 16 includes a control screw 10, a movable rod 14, and a movable member 20; two ends of the control screw 10 are respectively rotatably arranged on the first limiting plate 11 and the second limiting plate 12 and penetrate through the shell side cavity, and the movable piece 20 is screwed on the control screw 10; one end of the movable rod 14 is hinged on the movable piece 20 through a first hinging piece 13, and the other end of the movable rod 14 is hinged on the inlet pipeline 7 through a second hinging piece 15; the movable rods 14 are arranged at intervals along the circumferential direction of the movable piece 20, and the movable rods 14 are respectively connected with the plurality of inlet pipes 7 along the circumferential direction of the control screw 10.

Preferably, the two ends of the control screw 10 can be rotatably connected with the first limiting plate 11 and the second limiting plate 12 through sealing bearings, so as to ensure flexible rotation of the control screw 10 and tightness in the rotation process of the control screw, and ensure mutual independence of a tube side entering cavity, a shell side cavity and a tube side discharging cavity. The axial direction of the control screw 10 coincides with the length direction of the shell side chamber.

Preferably, one end of the control screw 10 may be provided with a motor having forward and reverse rotation functions, and the motor may be remotely controlled to rotate by means of an electric signal or the like. When the motor drives the control screw 10 to rotate positively, the movable rod 14 is pulled between the movable piece 20 and the inlet pipeline 7 to limit the rotation of the movable piece 20 to a certain extent, and the rotation of the control screw 10 is converted into the linear motion of the movable piece 20 along the axial direction of the control screw 10 through threads, so that a plurality of inlet pipelines 7 are pulled to expand and disperse through the movable rod 14. Similarly, when the motor drives the control screw 10 to reversely rotate, the movable rods 14 pull the plurality of inlet pipelines 7 to shrink and gather. The flow path, flow velocity and contact area with the inlet pipe 7 of the second medium are changed by different distribution states of the plurality of inlet pipes 7, thereby changing the heat exchange efficiency.

Preferably, the number of moving parts 20 on the control screw 10 can be adaptively adjusted according to the length of the shell side chamber, so that synchronous traction control on the inlet pipeline 7 at different positions is facilitated.

Referring to fig. 5, a plurality of the inlet pipes 7 are circumferentially distributed around the control screw 10 in multiple layers, and two adjacent inlet pipes 7 on the same straight line are connected by a connecting plate 19.

The inlet pipelines 7 can be distributed and arranged along the control screw 10 from inside to outside in a plurality of circles, the inlet pipelines 7 of the inner ring are pulled by the movable rod 14, and the inlet pipelines 7 of the outer ring are pulled by the connecting plate 19, so that synchronous expansion, dispersion, contraction and gathering of all the inlet pipelines 7 are ensured.

Preferably, the longitudinal extension of the connection plate 19 is located in the radial direction of the two inlet pipes 7 connected to the connection plate 19 and in the radial direction of the control screw 10.

Referring to fig. 3 and 5, two ends of the plurality of inlet pipes 7 are connected with a sliding block 17, sliding grooves 111 capable of sliding and embedding the sliding block 17 are formed in the first limiting plate 11 and the second limiting plate 12, one ends of the plurality of inlet pipes 7 are in sliding sealing connection with the first limiting plate 11 through the sliding block 17, and the other ends of the plurality of inlet pipes 7 are in sliding sealing connection with the second limiting plate 12 through the sliding block 17.

Through the sliding of the sliding block 17 along the sliding groove 111, the plurality of inlet pipelines 7 are prevented from being separated from the first limiting plate 11 and the second limiting plate 12 when the first limiting plate 11 and the second limiting plate 12 are expanded, dispersed and contracted to gather, and the tightness of the connecting part is ensured.

Preferably, both the sliding block 17 and the sliding groove 111 can adopt a rice-shaped structure, so that a plurality of access pipelines 7 which are circumferentially arranged in multiple layers can be conveniently connected. The sliding block 17 and the sliding groove 111 can be provided with a limit bump and other structures so as to ensure the relative sliding and effective connection of the sliding block 17 and the sliding groove 111 and prevent the first medium from flowing into the shell side cavity.

Referring to fig. 3, a plurality of first through holes for connecting the discharge pipe 8 are formed in the first limiting plate 11 located in the first channel 101, and a plurality of second through holes for connecting the discharge pipe 8 are formed in the second limiting plate 12 at positions opposite to the first through holes in the first limiting plate 11.

The aperture, the number and the distribution interval of the first through holes and the second through holes can be adaptively adjusted according to the pipe diameter, the number and the distribution interval of the discharge pipeline 8.

A plurality of baffles 9 are arranged in the shell side cavity at intervals, and the baffles 9 are positioned between the second inlet 4 and the second outlet 5; the baffle plate 9 is of a circular-notch structure, so that a circulation gap is reserved between the baffle plate 9 and the inner wall of the shell 1.

By arranging the stop blocks 9 with different numbers and different intervals, the flow path and the flow time of the second medium in the shell-side cavity can be changed and prolonged, so that the contact area between the shell 1 and the second medium is increased, and the heat conversion efficiency is improved.

Referring to fig. 2 and 3, the edge of one baffle plate 9 is connected with the middle lower part of the inner wall of the shell 1 in a sealing way, and the edges of two adjacent baffle plates 9 are connected with the middle upper part of the inner wall of the shell 1 in a sealing way; similarly, the edge of one baffle plate 9 is in sealing connection with the middle upper part of the inner wall of the shell 1, and the edge of two adjacent baffle plates 9 is in sealing connection with the middle lower part of the inner wall of the shell 1, so that an S-shaped channel is formed in the shell side cavity through the circulation gaps of the baffle plates 9.

S-shaped channels are formed by baffles 9 which are arranged at intervals in a staggered manner and are used for increasing the flow paths and the flow time of the second medium, and the number, arrangement spacing and flow gap size of the baffles 9 can be adaptively adjusted according to actual heat exchange requirements.

Limiting grooves 901 are formed in the baffle plates 9, and the control screw 10 and the inlet pipelines 7 penetrate through the baffle plates 9 through the limiting grooves 901.

Preferably, the limit groove 901 can adopt a rice-shaped structure, so that the arrangement of the screw 10 and the plurality of inlet pipelines 7 is convenient, and the expansion, dispersion and contraction gathering of the plurality of inlet pipelines 7 are also convenient.

Referring to fig. 1 and fig. 2, two ends of the housing 1 are respectively provided with a first flange 6 and a second flange 601, a closed tube side inlet chamber is formed between the first flange 6 and the first limiting plate 11, and a closed tube side outlet chamber is formed between the second flange 601 and the second limiting plate 12; the housing 1 is mounted on the heat treatment furnace by a first flange 6 and a second flange 601.

The first flange 6 and the second flange 601 facilitate the matching installation of the shell 1 on the heat treatment furnace, meanwhile, the reliable sealing of the two ends of the shell 1 is ensured, and the shell 1 can adopt a hollow circular tubular structure.

The second inlet 4 and the second outlet 5 are arranged along the diagonal of the shell side chamber, i.e. the second inlet 4 and the second outlet 5 are furthest apart on the shell side chamber for extending the flow path of the second medium.

Referring to fig. 1 to 5, the application method and the working principle of the utility model are as follows:

the housing 1 is mounted on the heat treatment furnace via a first flange 6 and a second flange 601.

The first medium enters the shell 1 from the first inlet 3, enters a plurality of inlet pipelines 7 through a second channel 102 of the tube side inlet chamber, enters the tube side outlet chamber after flowing through the inlet pipelines 7, enters the outlet pipeline 8 from the tube side outlet chamber, enters the first channel 101 of the tube side inlet chamber after flowing through the outlet pipeline 8, and finally is discharged from the first outlet 2 to finish one tube side of the first medium of the tube heat exchanger. And continuously completing the tube pass process of the first medium along with the continuous filling and discharging of the first medium, and completing heat conversion by completing a plurality of tube passes so as to enable the tube heat exchanger on the heat treatment furnace to complete heat conversion.

The second medium enters the shell side chamber through the second inlet 4 and flows through an S-shaped channel formed by a plurality of baffles 9 and then is discharged out of the shell side chamber from the second outlet 5, so that one shell side of the second medium of the tubular heat exchanger is completed. The heat conversion efficiency of the heat exchanger is improved through a plurality of tube passes and shell passes.

In the process of tube side and shell side, the staff can rotate control screw 10, make movable part 20 pass through screw drive along the axial movement of control screw 10, thereby drive a plurality of entering pipeline 7 along control screw 10 expansion dispersion or shrink gathering through a plurality of movable rods 14, thereby change the circulation speed of the inside second medium of casing 1 and with the area of contact of entering pipeline 7, and then change the efficiency of heat conversion, make heat conversion efficiency can control appointed effect through adjusting, the tubular heat exchanger on the current heat treatment furnace has solved because the internal passage is fixed causes the heat transfer effect relatively poor and the extravagant problem of energy between first heat transfer medium and the second heat transfer medium.

The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A tubular heat exchanger for heat treatment furnace is characterized in that: the device comprises a shell (1), a first outlet (2), a first inlet (3), a second inlet (4), a second outlet (5), an inlet pipeline (7), an outlet pipeline (8), a first limiting plate (11), a second limiting plate (12), a control assembly (16) and a partition plate (18); the shell (1) is of a hollow closed structure, and the first limiting plate (11) and the second limiting plate (12) are respectively arranged in the shell (1) and divide the shell (1) into a tube side inlet chamber, a shell side chamber and a tube side discharge chamber which are mutually independent in sequence; the partition plate (18) is arranged in the tube side entering cavity and divides the tube side entering cavity into a first channel (101) and a second channel (102) which are mutually independent, the plurality of entering pipelines (7) are respectively arranged in the shell side cavity at intervals, one ends of the plurality of entering pipelines (7) penetrate through the first limiting plate (11) and are communicated with the second channel (102), and the other ends of the plurality of entering pipelines (7) penetrate through the second limiting plate (12) and are communicated with the tube side discharging cavity; one end of each of the plurality of discharge pipelines (8) penetrates through the first limiting plate (11) and is communicated with the first channel (101), and the other end of each of the plurality of discharge pipelines (8) penetrates through the second limiting plate (12) and is communicated with the tube side discharge chamber; the first outlet (2) is arranged on the shell (1) and is communicated with the first channel (101), and the first inlet (3) is arranged on the shell (1) and is communicated with the second channel (102); the second inlet (4) and the second outlet (5) are respectively arranged on the shell (1) and are communicated with the shell side cavity; the control component (16) is arranged in the shell side cavity and is movably connected with a plurality of inlet pipelines (7).

2. A tubular heat exchanger for use in a heat treatment furnace according to claim 1, wherein: the control assembly (16) comprises a control screw (10), a movable rod (14) and a movable piece (20); two ends of the control screw (10) are respectively rotatably arranged on the first limiting plate (11) and the second limiting plate (12) and penetrate through the shell side cavity, and the movable piece (20) is screwed on the control screw (10); one end of the movable rod (14) is hinged on the movable piece (20), and the other end of the movable rod (14) is hinged on the inlet pipeline (7); the movable rods (14) are arranged at intervals along the circumferential direction of the movable piece (20), and the movable rods (14) are respectively and correspondingly connected with the plurality of inlet pipelines (7) in the circumferential direction of the control screw (10).

3. A tubular heat exchanger for use in a heat treatment furnace according to claim 2, wherein: the plurality of the inlet pipelines (7) are circumferentially distributed around the control screw (10) in multiple layers, and two adjacent inlet pipelines (7) positioned on the same straight line are connected through the connecting plate (19).

4. A tubular heat exchanger for use in a heat treatment furnace according to claim 1 or 2, wherein: the two ends of a plurality of entering pipelines (7) are connected with sliding blocks (17), sliding grooves (111) capable of sliding and embedding the sliding blocks (17) are formed in the first limiting plates (11) and the second limiting plates (12), one ends of the plurality of entering pipelines (7) are in sliding sealing connection with the first limiting plates (11) through the sliding blocks (17), and the other ends of the plurality of entering pipelines (7) are in sliding sealing connection with the second limiting plates (12) through the sliding blocks (17).

5. A tubular heat exchanger for use in a heat treatment furnace according to claim 1, wherein: a plurality of first through holes for penetrating through the discharge pipeline (8) are formed in the first limiting plate (11) located in the first channel (101), and a plurality of second through holes for penetrating through the discharge pipeline (8) are formed in the second limiting plate (12) at positions opposite to the first through holes in the first limiting plate (11).

6. A tubular heat exchanger for use in a heat treatment furnace according to claim 1 or 2, wherein: a plurality of baffles (9) are arranged in the shell side chamber at intervals, and the baffles (9) are positioned between the second inlet (4) and the second outlet (5); the baffle (9) is of a circular-segment structure, so that a circulation gap is reserved between the baffle (9) and the inner wall of the shell (1).

7. The tube heat exchanger for use in a heat treatment furnace according to claim 6, wherein: the edge of one baffle plate (9) is in sealing connection with the middle lower part of the inner wall of the shell (1), and the edge of two adjacent baffle plates (9) is in sealing connection with the middle upper part of the inner wall of the shell (1); similarly, the edge of one baffle plate (9) is in sealing connection with the middle upper part of the inner wall of the shell (1), and the edge of two adjacent baffle plates (9) is in sealing connection with the middle lower part of the inner wall of the shell (1), so that an S-shaped channel is formed in the shell side cavity through the circulation gaps of the baffle plates (9).

8. The tube heat exchanger for use in a heat treatment furnace according to claim 7, wherein: limiting grooves (901) are formed in the baffle plates (9), and the control screw (10) and the inlet pipelines (7) penetrate through the baffle plates (9) through the limiting grooves (901).

9. A tubular heat exchanger for use in a heat treatment furnace according to claim 1, wherein: the two ends of the shell (1) are respectively provided with a first flange (6) and a second flange (601), a closed tube side inlet chamber is formed between the first flange (6) and the first limiting plate (11), and a closed tube side outlet chamber is formed between the second flange (601) and the second limiting plate (12); the housing (1) is mounted on the heat treatment furnace by a first flange (6) and a second flange (601).

10. A tubular heat exchanger for use in a heat treatment furnace according to claim 1, wherein: the second inlet (4) and the second outlet (5) are arranged along the diagonal of the shell side chamber.