Anti-corrosion boiler air preheater

Abstract

The utility model discloses an anti-corrosion type boiler air preheater, and relates to the technical field of air preheaters, the anti-corrosion type boiler air preheater comprises a box body, flow dividers are fixedly connected to openings at the two ends of the box body, the outer end of one flow divider is fixedly connected with a waste gas inlet pipe, the outer end of the other flow divider is fixedly connected with a waste gas discharge pipe, and the outer end of the other flow divider is fixedly connected with a water inlet pipe. A plurality of evenly-arranged heat exchange pipes are fixedly connected between the two flow dividers, two sealing plates are fixedly connected to the position, close to the waste gas exhaust pipe, of the inner wall of the box body, the heat exchange pipes penetrate through the two sealing plates, an inner cavity is formed between the two sealing plates, and an air inlet branch pipe and an air exhaust branch pipe are fixedly connected to the outer side of the box body. The other end of the exhaust branch pipe is fixedly connected and communicated with the waste gas inlet pipe, the outer portion of the box body is fixedly connected with the air exhaust pipe and the air inlet pipe, the corrosion-resistant boiler air preheater avoids the phenomenon that corrosive gas condenses water drops, and the pipe wall is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheaters, in particular to a corrosion-resistant boiler air preheater. Background Art

[0002] The air preheater is a heating surface that preheats the flue gas in the tail flue of the boiler to a certain temperature through the internal heat sink. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption.

[0003] Patent No. CN216281487U discloses a high-efficiency boiler air preheater, including a cylindrical preheating tube, a group of heat-conducting pipes are arranged in the preheating tube, the upper and lower ends of the preheating tube are fixedly connected with cover plates, the two ends of the heat-conducting pipe are fixedly connected to the cover plates, the upper end of the heat-conducting pipe is connected to the tail gas inlet pipe, the lower end of the heat-conducting pipe is connected to the tail gas exhaust pipe, the upper cover plate is connected to the air supply mechanism, the lower cover plate is connected to the exhaust mechanism, the preheating tube is tilted, a group of tube sleeves are fixedly connected to the outer wall of the preheating tube, and the tube sleeves are fixedly connected to the preheating tube bracket. The utility model has a reasonable design, good preheating effect and high efficiency;

[0004] The high-efficiency boiler air preheater in this patent does not have a corrosive structure. Since the exhaust gas contains corrosive gases, when the high-temperature corrosive gases condense into water droplets at the tail end of the heat exchange tube, they will cause corrosion to the tube wall. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a corrosion-resistant boiler air preheater, which solves the problem that the heat exchange tubes are easily corroded.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a corrosion-resistant boiler air preheater, comprising a box body, with diverters fixedly connected to the openings at both ends of the box body, one of the diverters is fixedly connected to an exhaust gas inlet pipe at the outer end, and the other diverter is fixedly connected to an exhaust gas outlet pipe at the outer end, and a plurality of evenly arranged heat exchange tubes are fixedly connected between the two diverters, and two sealing plates are fixedly connected to the inner wall of the box body near the exhaust gas outlet pipe, the heat exchange tube passes through the two sealing plates, and an inner cavity is formed between the two sealing plates, and an intake branch pipe and an exhaust branch pipe are fixedly connected to the outside of the box body, respectively, and the intake branch pipe and the exhaust branch pipe are respectively fixedly fixed at both ends of the box body and connected to the inner cavity, and the other end of the exhaust branch pipe is fixedly connected to the exhaust gas inlet pipe and connected to each other, and an air outlet pipe and an air inlet pipe are fixedly connected to the outside of the box body, respectively, and the air outlet pipe and the air inlet pipe are respectively arranged on both sides of the box body and connected to the inside of the box body.

[0007] Preferably, the diverter is hollow inside, and a plurality of evenly arranged sockets are provided on one side of the diverter close to the box body, the sockets are connected to the exhaust gas inlet pipe or the exhaust gas outlet pipe, and the heat exchange tubes are fixedly inserted in the sockets.

[0008] Preferably, the heat exchange tube comprises a tube body, and both the inner wall and the outer wall of the tube body are provided with an anti-corrosion layer.

[0009] Preferably, a plurality of guide plates are fixedly connected in the box body, and adjacent guide plates are staggered with each other, and a zigzag air passage is formed between the guide plates.

[0010] Preferably, the exhaust gas inlet pipe and the air inlet branch pipe are both connected to the exhaust gas outlet of the boiler, the air outlet pipe is connected to the air inlet of the boiler, and the air inlet pipe is connected to an external blower.

[0011] Preferably, the box body is a rectangular box body made of stainless steel, and the outer side of the box body is coated with a thermal insulation coating.

[0012] Beneficial Effects

[0013] The utility model provides a corrosion-resistant boiler air preheater. Compared with the prior art, it has the following advantages:

[0014] Beneficial effects:

[0015] 1. The corrosion-resistant boiler air preheater is provided with two sealing plates, an air intake branch pipe and an exhaust branch pipe. Since the waste gas contains corrosive gases, when the high-temperature corrosive gases condense into water droplets at the tail end of the heat exchange tube, it will cause corrosion to the tube wall. The device is provided with an air intake branch pipe and an exhaust branch pipe, which discharge a small amount of waste gas into the inner cavity and heat the tail end of the heat exchange tube, thereby preventing the phenomenon of corrosive gas condensing into water droplets and protecting the tube wall.

[0016] 2. The corrosion-resistant boiler air preheater is provided with guide plates. Air enters from the air inlet pipe, flows between the guide plates and is discharged from the boiler from the air outlet pipe. In this process, the air is heated by the heat exchange tube, and a tortuous air channel is formed between the guide plates, which increases the contact area between the air and the heat exchange tube and improves the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the box of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the flow divider of the utility model;

[0020] Figure 4This is a schematic diagram of the heat exchange tube structure of the utility model.

[0021] In the figure: 1. box body; 2. guide plate; 3. heat exchange tube; 31. tube body; 32. anti-corrosion layer; 4. sealing plate; 5. air inlet branch pipe; 6. inner cavity; 7. exhaust branch pipe; 8. diverter; 9. exhaust gas inlet pipe; 10. exhaust gas outlet pipe; 11. air outlet pipe; 12. air inlet pipe; 13. socket. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4 The utility model provides a technical solution: a corrosion-resistant boiler air preheater, including a box body 1, with splitters 8 fixedly connected to the openings at both ends of the box body 1, one of the splitters 8 having an outer end fixedly connected to an exhaust gas inlet pipe 9, and the other splitter 8 having an outer end fixedly connected to an exhaust gas outlet pipe 10, a plurality of evenly arranged heat exchange tubes 3 fixedly connected between the two splitters 8, two sealing plates 4 fixedly connected to the inner wall of the box body 1 near the exhaust gas outlet pipe 10, the heat exchange tube 3 passes through the two sealing plates 4, an inner cavity 6 is formed between the two sealing plates 4, an intake branch pipe 5 and an exhaust branch pipe 7 are respectively fixedly connected to the outside of the box body 1, the intake branch pipe 5 and the exhaust branch pipe 7 are respectively fixed at both ends of the box body 1 and communicated with the inner cavity 6, the other end of the exhaust branch pipe 7 is fixedly connected to the exhaust gas inlet pipe 9 and communicated with each other, an air outlet pipe 11 and an air inlet pipe 12 are respectively fixedly connected to the outside of the box body 1, the air outlet pipe 11 and the air inlet pipe 12 are respectively arranged on both sides of the box body 1, and communicated with the inside of the box body 1.

[0024] The diverter 8 is hollow inside, and a plurality of evenly spaced sockets 13 are provided on one side of the diverter 8 close to the housing 1. The sockets 13 are connected to the exhaust gas inlet pipe 9 or the exhaust gas outlet pipe 10. The heat exchange tube 3 is fixedly inserted in the sockets 13. The heat exchange tube 3 includes a tube body 31, and the inner and outer walls of the tube body 31 are provided with an anti-corrosion layer 32.

[0025] A plurality of guide plates 2 are fixedly connected in the box body 1. Adjacent guide plates 2 are staggered with each other, and a zigzag air passage is formed between the guide plates 2 to increase the contact area between the air and the heat exchange tube 3 and improve the heat exchange efficiency. The exhaust gas inlet pipe 9 and the air intake branch pipe 5 are both connected to the exhaust gas outlet of the boiler, the air exhaust pipe 11 is connected to the air inlet of the boiler, and the air inlet pipe 12 is connected to the external blower. The box body 1 is a rectangular box body made of stainless steel. The outer side of the box body 1 is coated with a thermal insulation coating to reduce heat loss and improve the heat recovery rate.

[0026] During operation, the exhaust gas inlet pipe 9 and the air inlet branch pipe 5 are both connected to the exhaust gas outlet of the boiler, the air outlet pipe 11 is connected to the air inlet of the boiler, and the air inlet pipe 12 is connected to the external blower. Most of the exhaust gas generated by the combustion of the boiler enters from the exhaust gas inlet pipe 9 and flows from the heat exchange tube 3 to the exhaust gas outlet pipe 10 for discharge. At the same time, air enters from the air inlet pipe 12, flows between the guide plates 2, and is discharged from the boiler from the air outlet pipe 11. In this process, the air is heated by the heat exchange tube 3, thereby recovering energy and playing the role of air preheating. Since the exhaust gas contains corrosive gases, when the high-temperature corrosive gases condense into water droplets at the tail end of the heat exchange tube 3, they will cause corrosion to the tube wall. The device is provided with an air inlet branch pipe 5 and an exhaust branch pipe 7, which discharge a small amount of exhaust gas into the inner cavity 6 and heat the tail end of the heat exchange tube 3, thereby eliminating the phenomenon of corrosive gas condensing into water droplets and protecting the tube wall.

[0027] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A corrosion-resistant boiler air preheater, comprising a housing (1), characterized in that: The box body (1) is fixedly connected to the openings at both ends thereof with flow dividers (8), one of the flow dividers (8) is fixedly connected to an exhaust gas inlet pipe (9) at its outer end, and the other of the flow dividers (8) is fixedly connected to an exhaust gas outlet pipe (10) at its outer end, a plurality of evenly arranged heat exchange tubes (3) are fixedly connected between the two flow dividers (8), and two sealing plates (4) are fixedly connected to the inner wall of the box body (1) near the exhaust gas outlet pipe (10), the heat exchange tube (3) passes through the two sealing plates (4), and an inner cavity (6) is formed between the two sealing plates (4). An intake branch pipe (5) and an exhaust branch pipe (7) are fixedly connected to the outside of the box (1), respectively. The intake branch pipe (5) and the exhaust branch pipe (7) are fixedly connected to both ends of the box (1) and communicated with the inner cavity (6). The other end of the exhaust branch pipe (7) is fixedly connected to an exhaust gas inlet pipe (9) and communicated with each other. An air exhaust pipe (11) and an air inlet pipe (12) are fixedly connected to the outside of the box (1), respectively. The air exhaust pipe (11) and the air inlet pipe (12) are arranged on both sides of the box (1) and communicated with the inside of the box (1).

2. The corrosion-resistant boiler air preheater according to claim 1, characterized in that: The diverter (8) is hollow inside, and a plurality of evenly arranged plug holes (13) are provided on a side of the diverter (8) close to the housing (1), the plug holes (13) are connected to the exhaust gas inlet pipe (9) or the exhaust gas outlet pipe (10), and the heat exchange tube (3) is fixedly inserted into the plug holes (13).

3. The corrosion-resistant boiler air preheater according to claim 1, characterized in that: The heat exchange tube (3) comprises a tube body (31), and the inner wall and the outer wall of the tube body (31) are both provided with an anti-corrosion layer (32).

4. The corrosion-resistant boiler air preheater according to claim 1, characterized in that: A plurality of guide plates (2) are fixedly connected inside the box body (1), and adjacent guide plates (2) are arranged in a staggered manner, and a zigzag air passage is formed between the guide plates (2).

5. The corrosion-resistant boiler air preheater according to claim 1, characterized in that: The exhaust gas inlet pipe (9) and the air inlet branch pipe (5) are both connected to the exhaust gas outlet of the boiler, the air outlet pipe (11) is connected to the air inlet of the boiler, and the air inlet pipe (12) is connected to an external blower.

6. The corrosion-resistant boiler air preheater according to claim 1, characterized in that: The box body (1) is a rectangular box body made of stainless steel, and the outer side of the box body (1) is coated with a heat-insulating coating.

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