CN218210943U - H-type finned tube suitable for high-temperature or/and dusty gas heat exchange occasions - Google Patents

Abstract

The invention provides an H-shaped finned tube suitable for heat exchange occasions of high-temperature or/and dusty gas, wherein an airflow partition groove is arranged between fins on two sides of a base tube, airflow partition plates are arranged between the upper base tube and the lower base tube and are in contact with the inner sides of the fins, side plates are arranged on the outer sides of the fins and abut against the outer sides of the fins, and an airflow channel outside the tubes is formed by the side plates, the fin plates, part of the outer surfaces of the base tubes, the airflow partition groove and the airflow partition plates. The outer side surface of the airflow partition groove is contacted with the inner side edge of the fin without connection, and the edge of the airflow partition groove contacted with the base pipe is discontinuously connected with the outer surface of the base pipe; the side plate is contacted with the outer side edge of the fin without connection; the edge of the airflow dividing plate, which is in contact with the base pipe, is discontinuously connected with the outer surface of the base pipe. The independent air flow dividing groove, the air flow dividing plate, the side plate and the connecting pieces thereof improve the heat transfer performance of the finned tube, reduce the flow resistance, reduce the manufacturing and assembling difficulty of the fin and reduce the manufacturing cost.

Description

H-type finned tube suitable for high-temperature or/and dusty gas heat exchange occasions

Technical Field

The invention belongs to the technical field of heat exchange equipment, relates to structural improvement of an H-shaped finned tube, and aims to improve the performance of the H-shaped finned tube and facilitate product manufacture.

Background

The applicant previously filed the patent of 'continuous H-shaped finned tube with airflow subareas', 'H-shaped finned tube forming an airflow channel', 'continuous H-shaped finned tube cluster with multiple parallel tubes and airflow subareas', wherein finned tubes of a circular base tube are provided with airflow subarea structures, airflow does not flow through the front and back regions outside the base tube, airflow flowing direction change outside the base tube is reduced, flowing speed change amplitude is reduced, and low-efficiency airflow resistance loss is reduced. Meanwhile, the movement stagnation of impurities is not easily caused, the scaling adhesion of the impurities is avoided, and the scale resistance coefficient is small. When the surface of the fin is provided with the corrugations, the airflow direction of the channel between the fins is changed, the boundary layer is damaged, and the convection heat transfer is enhanced. When the same heat transfer task is realized, the power consumption of the fan is reduced; or when the power of the same fan is consumed, the heat transfer quantity is improved; the energy consumption of the convection heat transfer of the air flow outside the pipe is saved. In the process of technical research and product innovation, the applicant finds that in the occasion of high-temperature gas heat exchange outside the tube, the folded edges form an airflow channel during fin forming and processing, the functional performance of the H-shaped finned tube is improved, the flow resistance of gas outside the tube is reduced by more than 15%, but the workload of folding the fins is large, and the workload is increased when the fins are assembled. Moreover, in the neutral areas in front of and behind the H-shaped finned tube, gas stagnation and vortex consume flowing power. For this reason, the applicant proposes the present application for further optimizing the product structure.

According to the H-shaped finned tube, the air flow dividing grooves and the air flow dividing plates are additionally arranged among the H-shaped fins, and the side plates are arranged on the outer sides of the fins, so that air outside the tube flows forwards in channels among the fins, and the scaling change amplitude is small; the flow direction of the gas is locally changed under the guidance of the surface shape of the fin, the turbulence intensity of the gas flow is improved, and the convection heat transfer between the gas and the fin is enhanced. The airflow partition grooves, the airflow partition plates and the base tube are welded and connected, air is guided to flow in flow passages among the fins and simultaneously serves as longitudinal fins, the expansion heat exchange area of the outer surface of the tube is increased, heat is conducted to the base tube after the unilateral surface of the outer side of the partition plates conducts heat in a convection mode with the air, and the heat conduction strengthening effect is achieved. And the airflow partition groove and the airflow partition plate have the function of fins. Compared with the previously reported patent, the power consumption of gas flow in the technology is only used for overcoming the friction resistance loss of gas and the wall surface of the flow channel; and because the runner does not have the flow dead zone, be difficult to cause impurity to adhere the stagnation, and then avoid impurity to pile up the scale deposit, the dirt hinders the coefficient and little, and the dirt hinders stably.

Disclosure of Invention

The invention aims to provide an H-shaped finned tube with an airflow dividing groove, which is suitable for high-temperature or/and dusty gas heat exchange occasions, enhances the flow and heat transfer performance, and is a further improved innovation of the H-shaped finned tube in the boiler industry.

The technical scheme of the invention is as follows: an H-shaped finned tube with airflow dividing grooves suitable for high-temperature or/and dusty gas heat exchange occasions comprises base tubes, fins, airflow dividing grooves, airflow dividing plates, side plates and side plate connecting pieces, wherein the fins are symmetrically arranged and connected on the outer surface of the base tubes, the airflow dividing grooves are arranged between the fins on two sides and used for shielding areas without fins outside the outer circular surfaces of the air inlet sides and the air outlet sides of the base tubes; the side plates are in contact with the outer side edges of the fins but not connected, the top ends and the bottom ends of the fins are respectively connected with side plate connecting pieces, each side plate connecting piece is composed of two parts with included angles, one part is connected with the top ends and the bottom ends of the fins, and the other part clamps the side plates to form limit for the side plates in the vertical direction; the airflow partition plate is in contact with and not connected with the inner sides of the fins, and the upper edge and the lower edge of the airflow partition plate are in intermittent welding connection with the contact gap of the outer surface of the base pipe.

The side plate connecting piece is in a plug shape with the parts connected with the top end and the bottom end of the fin, the width of the plug is equal to the distance between the fin plates, and the plug is inserted into the fin and welded with the fin.

The air flow dividing plate is a metal plate, the width of the air flow dividing plate is equal to the length of the inner edge of the fin plate between adjacent base tubes on the double-tube or multi-tube finned tube, and the length of the air flow dividing plate is consistent with the arrangement length of the fins on the finned tube.

Furthermore, the middle part of the airflow partition plate is provided with an arc-shaped concave-convex part along the axial direction of the base pipe, and the arc-shaped concave-convex part is arranged in the full length range of the airflow partition plate and used for compensating the thermal deformation expansion of the airflow partition plate in the width direction.

The shape of the air flow partition groove can be as follows: along the cross section of the base pipe, the airflow dividing groove is a channel steel section or a U-shaped section; the air flow partition groove with the channel steel section is used for one side, adjacent to each other, of the finned tube in the tube bundle, the air flow partition groove with the U-shaped section is used for one side, provided with air inlet and outlet, of the finned tube on the periphery of the tube bundle, the width of the air flow partition groove is consistent with the distance between the inner edges of the fins on two sides of the finned tube, the height of the straight edge of the air flow partition groove is consistent with the length of the inner edge of the outermost section of the fins on two sides of the finned tube, and the length of the air flow partition groove is consistent with the arrangement length of the fins on the finned tube.

The fin is formed by combining a plurality of fin plates, the distance between every two adjacent fin plates ranges from 3mm to 15mm, the fin rate of the H-shaped fin tube ranges from 6 mm to 23, the basic shape of the single-side fin is rectangular, the outer edge of each single-side fin plate is a straight edge, the top edge and the bottom edge of each single-side fin plate are straight edges, the inner edges of the single-side fin plates are straight edges and arc edges which alternate, the part connected with the base tube is an arc edge, and the arc edge is centered or deviated to one end and is not centered; the arc edge is connected with the base pipe by welding.

The fin is made of a metal plate, turbulent flow concave-convex corrugations are arranged on the surface of the fin, the turbulent flow concave-convex corrugations are in the shape of transverse corrugations or longitudinal corrugations or oblique corrugations or dotted corrugations, the expansion coefficient of the turbulent flow concave-convex corrugations is 1.02-1.2, and the pitch is 3-8 mm.

The section of the airflow partition groove is of a hollow structure with a certain thickness, an inward concave structure along the axial direction of the base pipe is arranged in the full length range of the top edge of the airflow partition groove, and the inward concave structure is an arc inward concave structure, a rectangular inward concave structure or a triangular inward concave structure and is used for compensating thermal deformation expansion.

Furthermore, the fin plate is provided with communicating holes for communicating air flow, the aperture ratio of the communicating holes is 0.05-0.2, the equivalent diameter of the apertures is 1-3 mm, and the apertures are round, long round or rectangular.

Compared with the prior art, the invention has the beneficial effects that: this patent has set up independent air current subregion groove, air current subregion board, curb plate and connecting piece, has improved the processing property to component and finned tube overall structure are simple, have reduced the manufacturing of fin, the equipment degree of difficulty, make the product easily make, and manufacturing cost reduces, and stability of quality and quality are good. The airflow dividing grooves and the airflow dividing plates are additionally increased in fin area on the surface perpendicular to the fins, and the airflow dividing grooves and the airflow dividing plates have a function of enhancing heat transfer. The side plates shield the air flow, the air flow does not leak laterally, the fins shield the air flow, and the tube bundle is free from ineffective damage caused by air leakage.

Meanwhile, the technical effects of the patent previously applied by the applicant are as follows: the air flow dividing grooves and the finned tube side plates reduce the separation flow resistance after the gas outside the tubes collides with the tube walls and the tubes, and limit the ineffective flow of the gas flowing through the fin tops of the fins; the local resistance consumption of the airflow outside the pipe is eliminated, and the airflow power only overcomes the on-way resistance of the convection heat transfer. The H type finned tube that this patent provided, its outside of tubes gas does not flow no fin region, and outside of tubes gas flow direction and velocity variation are little, no flow blind spot, are difficult to cause impurity motion stagnation, and then avoid impurity scale deposit adhesion, and finned tube outer heat transfer performance is also more stable lasting, and the scale hinders the coefficient for a short time, and the scale hinders stably.

In the use effect, because the wind resistance is small, the power consumption of the fan is reduced when the same heat transfer task is realized; or when the same fan is used for power consumption, the air quantity is increased, the convection heat transfer coefficient is high, the scale resistance is small, the total heat transfer coefficient is high, and the heat transfer quantity is improved on the whole. The H-shaped finned tube has the advantages that under the same task condition, the material consumption of equipment is low, the occupied space of the equipment is small, and the technical and economic advantages are obvious.

Drawings

FIG. 1 is a schematic view of a single tube embodiment of the present invention having fins that are vertically symmetric;

FIG. 2 is a schematic view of a single tube embodiment of the present invention with asymmetric fin up and down;

FIG. 3 is a schematic view of a double tube finned tube embodiment of the present invention;

FIG. 4 is a schematic view of a three tube finned tube embodiment of the invention;

FIG. 5 is a schematic view of a single fin plate of the present invention, with flat-walled, non-corrugated, interconnected holes;

FIG. 6 is a schematic view of a single fin plate of the present invention with a flat wall having longitudinal corrugations;

FIG. 7 is a schematic view of a single fin plate of the present invention with flat walls provided with transverse corrugations;

FIG. 8 is a schematic view of a single fin plate of the present invention with flat walls provided with oblique corrugations;

FIG. 9 is a schematic structural view of the inner concave airflow distribution groove of the present invention, wherein a is an arc inner concave, b is a rectangular inner concave, and c is a triangular inner concave;

FIG. 10 is a schematic view of the air flow divider plate configuration of the present invention;

fig. 11 is a schematic view of the construction of the side panel connector of the present invention.

In the figure: the structure comprises 1-base tube, 2-fins, 3-airflow dividing groove, 4-airflow dividing plate, 5-side plate, 6-side plate connecting piece, 7-communicating hole, 8-arc indent, 9-rectangular indent and 10-triangular indent.

Detailed Description

The invention is described in more detail below with reference to the drawings and the detailed description. The following examples are presented to facilitate a better understanding of the invention by the skilled person and are not intended to limit the invention.

As shown in FIG. 1, the invention is a schematic structural diagram, and comprises a base pipe 1 with a circular cross section, fins 2, airflow partition grooves 3, airflow partition plates 4, side plates 5 and side plate connecting pieces 6.

As shown in fig. 1-4, pressure fluid such as boiler feed water, steam and the like flows in the base tube 1, and the outer fins 2 of the base tube 1, the outer surface of the tube wall, the airflow partition grooves 3, the airflow partition plates 4 and the surfaces of the side plates 5 form airflow channels for flowing gas with higher temperature such as smoke, air and the like. Along the airflow direction outside the tube, the front and rear edges of the fin are called windward edge and leeward edge, and the edge contacting the base tube and the corresponding edges are called inner side edge and outer side edge. The contact area of the inner side edges of the fins and the base pipe is an arc surface, and the contact area is connected with the base pipe in a welding mode. The single-side fin 2 is formed by a plurality of fin plates which are sequentially and uniformly arranged at intervals, the basic shape of the single-side fin 2 is rectangular, and the range of the distance between the adjacent fin plates is 3-15 mm; the finned rate of the H-shaped finned tube is 6-23. The fluid inside and outside the tube is in a cross-flow pattern.

As shown in FIGS. 1 to 4, in the cross section, a base pipe 1 is arranged in the middle, and fins 2 connected with the base pipe are symmetrically arranged on both horizontal sides. The base pipe 1 is a metal pipe with a circular section, and the base pipe 1 has a certain thickness; the fins 2 are thin-wall metal plates, the projection shape of the single-side fins on the radial cross section of the base tube is approximately rectangular, and the four peripheries of the fins are as follows: the outer contour lines of the three fins which are not in contact with the base tube are straight lines, the contact connection areas of the inner contour lines of the fins which are in contact connection with the base tube and the base tube are circular arc lines, and the rest are straight lines; the arc line is matched with the excircle radian of the base tube to form surface contact and welded connection. The circular arc line is centered or biased toward one end without being centered.

The fins 2 are made of metal plates, and as shown in fig. 5-7, the fin surfaces of the fins 2 can be flat surfaces or have turbulence concave-convex corrugations, which have punctiform, transverse corrugations, longitudinal corrugations, oblique corrugations, and the like. The fin plate of the fin 2 can be provided with a communicating hole 7, and the communicating hole 7 is communicated with an airflow channel. The expansion coefficient of the turbulent flow concave-convex corrugation is 1.02-1.2, and the pitch is 3-5 mm. The aperture ratio of the communicating holes is 0.05-0.2, the equivalent diameter of the apertures is 1-3 mm, and the apertures are round, long round or rectangular.

As shown in FIGS. 1 to 4, the base tubes at both ends of the H-type finned tube are not provided with fins within a certain length range, and the length is used for connecting the finned tube with a tube box (collecting tube).

As shown in fig. 1-4, because the inner side of each fin is provided with the airflow partition groove 3, the outer side of each fin is provided with the side plate 5, and an independent airflow channel is formed between the adjacent fin and the airflow partition plates 4 and between the adjacent fins and between the adjacent side plates 5, the airflow outside the tube can not flow through the tube external space without the fins, the direction and the speed change amplitude of the airflow outside the tube are small, the flow resistance is small, the power consumption is low, no flow dead zone exists outside the tube, and the dust deposition and scaling are avoided.

The airflow dividing groove 3 is arranged between the fins 2 on both sides of the base tube and is used for shielding airflow from flowing through the area without fins. When the base pipe 1 is single, the airflow dividing plate 4 is not provided. When more than one base pipe 1 is provided, the airflow partition plate 4 is arranged between the upper base pipe 1 and the lower base pipe 1 which are adjacent. The fins 2 are formed by uniformly arranging a plurality of fin plates at equal intervals along the length direction of the base tube 1. The lateral plate 5 is arranged on the outer side of the fin 2, and the lateral plate 5, the fin plate, part of the outer surface of the base tube, the airflow partition groove 3 and the airflow partition plate 4 form an airflow channel. The outer side surface of the airflow partition groove 3 is only contacted with the inner side of the fin 2 but not connected with the inner side of the fin, and the airflow partition groove 3 is intermittently welded with the base pipe 1. The top end and the bottom end of the fin 2 are respectively connected with a side plate connecting piece 6, and the side plate 5 is in contact with the outer side of the fin 2 but not connected with the outer side of the fin. The side plate connecting piece 6 is composed of two parts with included angles, one part is connected with the top end and the bottom end of the fin 2, and the other part clamps the side plate 5 to form the limit of the side plate 5 in the vertical direction. The airflow partition plate 4 is contacted with the inner side of the fin 2 but not connected with the inner side of the fin, and the gaps at the upper edge and the lower edge of the airflow partition plate 4, which are contacted with the outer surface of the base tube 1, are welded and connected intermittently.

Adopt airflow partition groove 3, airflow partition plate 4 and parent tube 1 intermittent welding, curb plate 5 is not fixed with fin 2 lug connection's mode, and the reason is: in a high-temperature working environment, the temperature difference between the side plate 5 and the base tube is large, and thermal deformation inconsistency among the airflow partition groove 3, the airflow partition plate 4, the side plate 5 and the base tube 1 can be compensated. The airflow partition grooves 3 and the airflow partition plates 4 are provided with telescopic structures to compensate thermal deformation constraint of the airflow partition grooves so as to adapt to the characteristics of large deformation and uncoordinated application environment in a high-temperature environment.

Preferably, the parts of the side plate connecting pieces 6 connected with the top ends and the bottom ends of the fins 2 are in a plug shape, the width of each plug is equal to the distance between the fin plates, and the plug is inserted into the fins 2 and welded with the fins 2.

In order to increase firmness, the side plate connecting pieces 6 are provided with a plurality of side plate connecting pieces 6, the side plate connecting pieces 6 positioned in the middle of the side plates 5 are welded with the top ends and the bottom ends of the fins 2 and the side plates 5, and the side plate connecting pieces 6 except the side plate connecting pieces 6 in the middle of the side plates 5 are only welded with the top ends and the bottom ends of the fins 2 and are not fixedly connected with the side plates 5. Therefore, the expansion of the airflow partition groove 3, the airflow partition plate 4 and the side plate 5 in the axial direction of the base pipe is not influenced by the fixed connection in the middle (the area of the connection area is small, the contraction amount is small, the connection area is in the middle, and the contraction amount towards two sides is almost not influenced).

The width of the air flow dividing groove 3 is just embedded into the inner edges of the fins on two sides. The section of the airflow partition groove 3 is of a hollow structure with a certain thickness, the two sides of the airflow partition groove are flat plates which are parallel to each other, the middle of each flat plate is a top edge, the full length range of each top edge is provided with an inwards concave structure along the axial direction of the base pipe, and the inwards concave structure is provided with an arc inwards concave 8, a rectangular inwards concave 9 or a triangular inwards concave 10 which is used for compensating thermal deformation expansion in the width direction of the partition groove. The middle part of the airflow partition plate is provided with an arc-shaped concave-convex part along the axial direction of the base pipe, and the arc-shaped concave-convex part is arranged in the full length range of the airflow partition plate and used for compensating thermal deformation expansion of the airflow partition plate in the width direction.

Claims (10)

1. The utility model provides a H type finned tube suitable for high temperature or/and dusty gas heat transfer occasion, including parent tube (1), fin (2), air current subregion groove (3), air current subregion board (4), curb plate (5), curb plate connecting piece (6), fin (2) are arranged and are connected on parent tube (1) surface symmetrically, air current subregion groove (3) set up between both sides fin (2), be used for sheltering from parent tube (1) air inlet side, give vent to anger the no fin region outside the outer disc of side place, when parent tube (1) is single, no air current subregion board (4), when parent tube (1) has two above constitution double-barrelled or multitube H type finned tube cluster, air current subregion board (4) set up between upper and lower adjacent parent tube (1) and near fin (2) inboard, fin (2) are that a plurality of fin boards form along (1) length direction even equidistant range upon range of, fin (2) outside setting and fin (2) curb plate (5) near outside the tube, the base tube board, a part of plate, the part of parent tube, air current subregion surface, air current subregion groove (3), the air current passage (4) constitutes characterized by the air current passageway (4): the outer side surface of the airflow partition groove (3) is in contact with the inner side of the fin (2) but not connected with the inner side of the fin, and the edge of the airflow partition groove (3) in contact with the base tube (1) is intermittently connected with the outer surface of the base tube; the side plates (5) are in contact with and not connected with the outer side edges of the fins (2), the top ends and the bottom ends of the fins (2) are respectively connected with side plate connecting pieces (6), each side plate connecting piece (6) is composed of two parts with an included angle, one part is connected with the top ends and the bottom ends of the fins (2), and the other part clamps the side plates (5) to limit the side plates (5) in the vertical direction; the air flow dividing plate (4) is in contact with the inner sides of the fins (2) and is not connected with the inner sides of the fins, and gaps, in contact with the outer surface of the base pipe (1), of the upper edge and the lower edge of the air flow dividing plate (4) are connected intermittently.

2. An H-type finned tube suitable for heat exchange occasions of high temperature or/and dust-containing gas as claimed in claim 1, wherein: the side plate connecting pieces (6) are arranged in a plurality of numbers, the side plate connecting pieces (6) positioned in the middle of the side plates (5) are fixedly connected with the top ends and the bottom ends of the fins (2) and are also fixedly connected with the side plates (5), and the side plate connecting pieces (6) except the side plate connecting pieces (6) in the middle of the side plates (5) are only welded with the top ends and the bottom ends of the fins (2) and are not fixedly connected with the side plates (5).

3. An H-type finned tube suitable for high temperature or/and dusty gas heat exchange occasions according to claim 1, which is characterized in that: along the cross section of the base pipe (1), the airflow partition groove (3) is a channel steel-shaped section or a U-shaped section; the air flow partition groove (3) with the channel steel section is used for one side, adjacent to each other, of the finned tube in the tube bundle, the air flow partition groove (3) with the U-shaped section is used for one side, used for air inlet and air outlet, of the finned tube on the periphery of the tube bundle, the width of the air flow partition groove (3) is consistent with the distance between the inner edges of the fins on two sides of the finned tube, the height of the straight edge of the air flow partition groove (3) on the section is consistent with the length of the inner edge of the outermost section of the fins on two sides of the finned tube, and the length of the air flow partition groove (3) is consistent with the arrangement length of the fins on the finned tube.

4. An H-type finned tube suitable for high temperature or/and dusty gas heat exchange occasions according to claim 1, which is characterized in that: the airflow division plate (4) is a metal plate, the width of the airflow division plate (4) is equal to the length of the inner edge of the fin plate between adjacent base tubes on the double-tube or multi-tube finned tube, and the length of the airflow division plate (4) is consistent with the arrangement length of the fins on the finned tube.

5. An H-type finned tube suitable for high temperature or/and dusty gas heat exchange occasions according to claim 4, which is characterized in that: the middle part of the airflow partition plate (4) is provided with a circular arc-shaped concave-convex along the axial direction of the base pipe, and the circular arc-shaped concave-convex is arranged in the full length range of the airflow partition plate (4) and used for compensating the thermal deformation expansion of the airflow partition plate (4) in the width direction.

6. An H-type finned tube suitable for heat exchange with high-temperature or/and dusty gas as claimed in any one of claims 1 to 5, wherein: the fin (2) is formed by combining a plurality of fin plates, the distance between every two adjacent fin plates ranges from 3mm to 15mm, the fin rate of the H-shaped fin tube ranges from 6 mm to 23, the basic shape of the single-side fin (2) is rectangular, the outer edge of the single-side fin plate is a straight edge, the top edge and the bottom edge are straight edges, the inner edge is a straight edge and an arc edge which are alternated, the part connected with the base tube (1) is an arc edge, and the arc edge is centered or deviated to one end but not centered; the arc edge is connected with the contact seam of the base pipe (1) by welding.

7. An H-type finned tube suitable for heat exchange with high-temperature or/and dusty gas as claimed in any one of claims 1 to 5, wherein: the fin (2) is made of a metal plate, turbulent flow concave-convex corrugations are arranged on the surface of the fin (2), the shapes of the turbulent flow concave-convex corrugations comprise transverse corrugations, longitudinal corrugations, oblique corrugations or punctiform corrugations, the expansion coefficient of the turbulent flow concave-convex corrugations is 1.02-1.2, and the pitch is 3-8 mm.

8. An H-type finned tube suitable for use in heat exchange applications for high temperature and/or dust laden gases as claimed in any one of claims 1 to 5 wherein: the section of the airflow partition groove (3) is of a hollow structure with a certain thickness, the full length range of the top edge of the airflow partition groove (3) is provided with an inward concave structure along the axial direction of the base pipe, and the inward concave structure is provided with an arc inward concave structure (8), a rectangular inward concave structure (9) or a triangular inward concave structure (10), and the inward concave structure is used for compensating thermal deformation expansion.

9. An H-type finned tube suitable for heat exchange with high-temperature or/and dusty gas as claimed in any one of claims 1 to 5, wherein: the fin plate of the fin (2) is provided with communicating holes (7) communicated with air flow, the aperture ratio of the communicating holes is 0.05-0.2, the equivalent diameter of the apertures is 1-3 mm, and the apertures are circular, long circular or rectangular.

10. An H-type finned tube suitable for heat exchange with high-temperature or/and dusty gas as claimed in any one of claims 1 to 5, wherein: the side plate connecting piece (6) is in a plug shape with the top end and the bottom end of the fin (2), the width of the plug is equal to the distance between fin plates, and the plug is inserted into the fin (2) and welded with the fin (2).

Images