Boiler waste heat recycling heat exchange structure and manufacturing process thereof

Abstract

The application discloses a boiler waste heat recycling heat exchange structure, which comprises a water pipe and a heat exchange plate fixedly connected with the water pipe, the heat exchange plate is provided with a groove in contact with the water pipe, and the groove is provided with welding teeth facilitating welding of the heat exchange plate and the water pipe. The boiler waste heat recycling heat exchange structure is reasonable in design, improves the welding effect of the heat exchange plate and the water pipe, improves the contact area of the heat exchange plate and the water pipe, and avoids the existence of virtual welding between the heat exchange plate and the water pipe.

Description

Technical Field

[0001] This invention relates to a heat exchange structure, and more particularly to a boiler waste heat recovery heat exchange structure and its manufacturing process. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. The hot water or steam produced in the boiler can directly provide the heat energy needed for industrial production and daily life, or it can be converted into mechanical energy through a steam power unit, or further converted into electrical energy through a generator. In current technology, the waste heat contained in the boiler flue gas is mainly utilized to achieve full energy utilization.

[0003] In existing technologies, boiler waste heat recovery heat exchange structures such as Figure 8-9 As shown, the system includes an upper water pipe, a lower water pipe, and a heat exchange plate in contact with the upper and lower water pipes. Flue gas passes through the upper and lower water pipes sequentially from top to bottom. The heat exchange plate is heated and transfers heat to the water pipes, heating the water flowing inside. Due to the limited contact area between the heat exchange plate and the water pipes, the heat exchange plate and the water pipes are only partially enclosed, resulting in low heating efficiency of the water pipes and low recovery efficiency of boiler waste heat. Furthermore, the impact of flue gas on the water pipes can easily cause wear and tear on the pipes.

[0004] In the existing technology, the heat exchange plate and the water pipe are connected by welding. Because the two heat exchange plates are pressed against each other during welding, the bottom of the groove is easily welded to the water pipe, but the groove opening and the water pipe are not properly welded, which prevents good heat transfer.

[0005] In the prior art, in order to protect the water pipe, after the heat exchange plate and the water pipe are welded together, the existing protective plate is inserted from top to bottom and then welded to the upper water pipe. Since the heat exchange plate and the water pipe are already welded together, the existing protective plate cannot be installed on the upper wall of the lower water pipe, so the lower water pipe cannot be effectively protected.

[0006] Therefore, it is necessary to improve the existing boiler waste heat recovery heat exchange structure. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects in the prior art and provide a boiler waste heat recovery heat exchange structure and its manufacturing process, improve the welding effect of the heat exchange plate and the water pipe, increase the contact area between the heat exchange plate and the water pipe, and avoid the phenomenon of false welding between the heat exchange plate and the water pipe.

[0008] To achieve the above technical effects, the technical solution of the present invention is as follows: a boiler waste heat recovery heat exchange structure, including a water pipe and a heat exchange plate fixedly connected to the water pipe, the heat exchange plate being provided with a groove that contacts the water pipe, and the groove being provided with welding teeth to facilitate welding the heat exchange plate to the water pipe.

[0009] A preferred technical solution is that a plurality of the welding teeth are distributed on the inner wall of the groove.

[0010] A preferred technical solution is that the tooth height of the plurality of welding teeth is gradually reduced along the direction from the groove opening to the bottom of the groove.

[0011] A preferred technical solution is that the thickness of the plurality of welding teeth gradually increases along the direction from the opening of the groove to the bottom of the groove.

[0012] A preferred technical solution is that the surface of the heat exchange plate is provided with an arc-shaped surface for increasing its heat exchange area.

[0013] A preferred technical solution is that the surface of the heat exchange plate is wavy.

[0014] A preferred technical solution is that at least two heat exchange plates are provided at the end of the heat exchange plate, and a heat exchange gap is provided between two adjacent heat exchange plates.

[0015] A preferred technical solution further includes a dust baffle that covers and is disposed above the water pipe, the dust baffle being provided with a limiting groove that cooperates with the welding teeth for limiting.

[0016] A preferred technical solution is that the surfaces on both sides of the groove are planar.

[0017] A manufacturing process for a boiler waste heat recovery heat exchanger structure includes the following steps:

[0018] S1. Fit the outer wall of the water pipe with the welding teeth;

[0019] S2. Two dust-proof plates cover the water pipe and slide towards each other from both sides of the heat exchange plate, with the limiting groove aligned with the welding teeth, until the two dust-proof plates contact each other and the welding teeth are located in the limiting groove.

[0020] S3. The two heat exchange plates are pressed against each other under the action of external force, and welding operations are carried out on the contact surfaces of the welding teeth, dust baffles and water pipes.

[0021] The advantages and beneficial effects of this invention are as follows: The boiler waste heat recovery heat exchange structure and its manufacturing process are reasonably designed. By setting welding teeth on the heat exchange plate, and the welding teeth at the slot opening having a relatively long tooth height, the heat exchange plate and the water pipe can always contact and weld together, avoiding the occurrence of incomplete welding. The arc surface design of the heat exchange plate increases the contact area between the heat exchange plate and the flue gas, improving the heating effect of the heat exchange plate. The cooperation between the dust baffle and the welding teeth ensures the fixation of the dust baffle, and the dust baffle also plays a role in protecting the water pipe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the boiler waste heat recovery heat exchange structure of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of a group of heat exchange plates connected to a water pipe;

[0024] Figure 3 yes Figure 2 An explosion diagram;

[0025] Figure 4 This is a schematic diagram of the structure of the dust baffle plate and the heat exchange plate before welding.

[0026] Figure 5 yes Figure 4 An explosion diagram;

[0027] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0028] Figure 7 This is a schematic diagram of the separation structure of the dustproof plate and the welding teeth;

[0029] Figure 8 This is a schematic diagram of a boiler waste heat recovery heat exchange structure in the prior art;

[0030] Figure 9 yes Figure 8 An explosion diagram;

[0031] In the diagram: 1. Water pipe; 2. Heat exchange plate; 3. Groove; 4. Welding teeth; 5. Arc-shaped surface; 6. Heat exchange plate; 7. Dust baffle; 8. Limiting groove; 9. Heat exchange gap; 10. Existing protective plate; 11. Lower water pipe; 12. Upper water pipe. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Example

[0035] like Figure 1-7 As shown, the boiler waste heat recovery heat exchange structure of the embodiment includes a water pipe 1 and a heat exchange plate 2 fixedly connected to the water pipe 1. The heat exchange plate 2 is provided with a groove 3 that contacts the water pipe 1. The groove 3 is provided with welding teeth 4 to facilitate welding the heat exchange plate 2 to the water pipe 1.

[0036] With this design, when the water pipe 1 is welded to the heat exchange plate 2, the outer wall of the water pipe 1 comes into contact with the welding teeth 4. As the welding progresses, the welding teeth 4 melt and fill the tooth groove, so that the water pipe 1 and the groove 3 are firmly welded and the groove 3 is in complete contact with the outer wall of the water pipe 1, thus avoiding the occurrence of false welding.

[0037] Specifically, several of the welding teeth 4 are distributed on the inner wall of the groove 3.

[0038] With this design, welding teeth 4 are distributed on the inner wall of the groove 3, which ensures good contact during welding, strong welding, and contact area after welding.

[0039] Furthermore, the tooth height of several of the welding teeth 4 is gradually reduced along the direction from the opening to the bottom of the groove 3.

[0040] This design ensures that the groove opening of the groove 3 is firmly welded to the outer wall of the water pipe 1. Compared to the gradual increase in tooth height of the welding teeth 4 from the groove opening to the bottom of the groove, the welding teeth 4 at the bottom of the groove have already contacted the outer wall of the water pipe 1, while the welding teeth 4 at the groove opening still have a gap with the outer wall of the water pipe 1 and cannot be welded.

[0041] Furthermore, the thickness of several of the welding teeth 4 is gradually increased along the direction from the opening to the bottom of the groove 3.

[0042] With this design, the welding teeth 4 at the groove opening are thin and long, while the welding teeth 4 at the bottom of the groove are wide and short, ensuring the welding effect between the heat exchange plate 2 and the water pipe 1, and the contact point between the groove 3 and the water pipe 1 can be completely welded.

[0043] Furthermore, the surface of the heat exchange plate 2 is provided with an arc-shaped surface 5 for increasing its heat exchange area.

[0044] With this design, compared to the flat surface of the heat exchange plate 2, the arc-shaped surface 5 increases the surface area of ​​the heat exchange plate 2, thereby increasing the contact area with the flue gas and enhancing the heat exchange effect between the heat exchange plate 2 and the flue gas.

[0045] Specifically, the surface of the heat exchange plate 2 is wavy. This design further defines the above scheme; the wavy shape has a larger surface area compared to a single curved surface.

[0046] Furthermore, at least two heat exchange plates 6 are provided at the end of the heat exchange plate 2, and a heat exchange gap 9 is provided between two adjacent heat exchange plates 6.

[0047] This design further increases the heat exchange area of ​​the heat exchange plate 2 and the passage path of the flue gas, thereby further enhancing the heat exchange effect between the heat exchange plate 2 and the flue gas.

[0048] Furthermore, it also includes a dustproof plate 7 covering the water pipe 1, the dustproof plate 7 being provided with a limiting groove 8 that limits and cooperates with the welding teeth 4.

[0049] With this design, the dust baffle 7 on the water pipe 1 can prevent the particles in the flue gas from abrading the water pipe 1 when it passes through, thus preventing damage to the water pipe 1. The design of the limiting groove 8 can ensure that the dust baffle 7 can be installed on the water pipe 1 before the heat exchange plate 2 is welded to the water pipe 1. Both water pipes 1 can be equipped with the dust baffle 7, so that both water pipes 1 can be protected. Compared with installing the existing protective plate 10 after the heat exchange plate 2 is welded to the water pipe 1, not only can the existing protective plate 10 not be fixed firmly, but only the upper water pipe 12 can be protected, while the lower water pipe 11 cannot be equipped with the existing protective plate 10 and cannot be effectively protected.

[0050] Specifically, the surfaces on both sides of the groove 3 are planar.

[0051] A manufacturing process for a boiler waste heat recovery heat exchanger structure includes the following steps:

[0052] S1. Fit the outer wall of the water pipe 1 with the welding teeth 4;

[0053] S2. Two dust-blocking plates 7 cover the water pipe 1 and slide towards each other from both sides of the heat exchange plate 2, with the limiting groove 8 aligned with the welding teeth 4, until the two dust-blocking plates 7 come into contact and the welding teeth 4 are located in the limiting groove 8.

[0054] S3. The two heat exchange plates 2 are pressed against each other under the action of external force, and welding operations are carried out on the contact surfaces of the welding teeth 4, the dust baffle 7, and the water pipe 1.

[0055] This manufacturing process, through a single welding operation, secures the water pipe and heat exchange fins, as well as the water pipe, heat exchange fins, and dust baffle, resulting in a strong connection and high processing efficiency.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A boiler waste heat recovery heat exchange structure, characterized by, The utility model provides a heat exchange plate and water pipe, it includes water pipe (1) and with water pipe (1) fixed connection's heat exchange plate (2), heat exchange plate (2) is provided with with water pipe (1) contact's recess (3), recess (3) is provided with the welding tooth (4) of facilitating heat exchange plate (2) with water pipe (1) is welded, still include the dust baffle (7) of covering setting in water pipe (1) top, dust baffle (7) is provided with with welding tooth (4) limit position cooperation's limit slot (8).

2. The boiler waste heat recovery heat exchange structure according to claim 1, characterized by, Several welding teeth (4) are distributed and set on the inner wall of the recess (3).

3. The boiler waste heat recovery heat exchange structure according to claim 2, characterized by, The tooth height of the several welding teeth (4) is gradually reduced and set along the direction from the slot opening to the slot bottom of the recess (3).

4. The boiler waste heat recovery heat exchange structure according to claim 3, characterized by, The tooth thickness of the several welding teeth (4) is gradually increased and set along the direction from the slot opening to the slot bottom of the recess (3).

5. The boiler waste heat recovery heat exchange structure according to claim 1, characterized by, The surface of the heat exchange plate (2) is provided with an arc surface (5) for enlarging the heat exchange area.

6. The boiler waste heat recovery heat exchange structure according to claim 5, wherein The surface of the heat exchange plate (2) is in a wave shape.

7. The boiler waste heat recovery heat exchange structure according to claim 1, characterized by, The end of the heat exchange plate (2) is extended and provided with at least two heat exchange fins (6), and a heat exchange gap (9) is arranged between the two adjacent heat exchange fins (6).

8. The boiler waste heat recovery heat exchange structure according to claim 1, characterized by, The surfaces on both sides of the recess (3) are in a plane.

9. A manufacturing process of a boiler waste heat recycling heat exchange structure, characterized in that, The steps include: S1, the outer wall of water pipe (1) is attached with welding tooth (4); S2, two dust baffle (7) covers in water pipe (1), respectively from heat exchange plate (2) two sides are sliding towards, and limit slot (8) is aligned with welding tooth (4), until two dust baffle (7) contact and welding tooth (4) is located in limit slot (8); S3, two heat exchange plates (2) are pressed towards under the action of external force, and the contact surface of welding tooth (4), dust baffle (7) and water pipe (1) is welded.

Images