High-efficiency air heat exchanger with long service life for waste heat boiler

Abstract

The utility model discloses a waste heat boiler efficient air heat exchanger with long service life, which comprises a heat exchange shell, the bottom of the heat exchange shell is connected with a base, one side of the heat exchange shell is communicated with a flue gas input pipe, the other side of the heat exchange shell is communicated with a flue gas output pipe, one side of the top of the heat exchange shell is communicated with an air input pipe, and the other side of the heat exchange shell is communicated with an air outlet pipe. The other side of the top of the heat exchange shell communicates with an air output pipe, a first mounting frame is connected to the inner wall of the heat exchange shell, a temperature-resistant heat insulation frame is fixedly mounted in the middle of the first mounting frame, a second mounting frame is connected to the inner wall of the temperature-resistant heat insulation frame, a heat exchange pipe is fixedly mounted in the middle of the second mounting frame, and the temperature-resistant heat insulation frame comprises a rectangular frame and a side edge sealing plate. According to the efficient air heat exchanger of the waste heat boiler with the long service life, the whole heat exchanger enables the temperature in the heat exchange shell not to be in a high-temperature state, then weld joints at the connecting positions of the side plates of the shell cannot crack due to thermal expansion, and the service life of the heat exchanger is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of heat recovery of waste heat boilers, in particular to a high-efficiency air heat exchanger for waste heat boilers with a long service life. Background Art

[0002] With the development of industrial technology, the requirements for efficient use of energy and environmental protection are increasing day by day. As an important equipment in the industrial process, the waste heat boiler is usually used after the boiler is used. The heat energy in the flue gas can be used through the air heat exchanger.

[0003] Existing waste heat boiler air heat exchangers usually exchange heat inside the shell, and the side plates of the shell are in direct contact with the flue gas. Due to the high temperature of the flue gas, the welds at the connection of the side plates of the shell expand and crack due to thermal expansion, resulting in damage to the shell and shortening the service life of the heat exchanger. Utility Model Content

[0004] The utility model aims to provide a high-efficiency air heat exchanger for a waste heat boiler with a long service life, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a high-efficiency air heat exchanger for a waste heat boiler with a long service life, comprising a heat exchange shell, the bottom of the heat exchange shell is connected to a base, the bottom of the base is equipped with a water tank, one side of the heat exchange shell is connected to a smoke inlet pipe, the other side of the heat exchange shell is connected to a smoke outlet pipe, one side of the top of the heat exchange shell is connected to an air inlet pipe, and the other side of the top of the heat exchange shell is connected to an air outlet pipe, the inner wall of the heat exchange shell is connected to a first mounting frame, a temperature-resistant insulation frame is fixedly installed in the middle of the first mounting frame, the inner wall of the temperature-resistant insulation frame is connected to a second mounting frame, a heat exchange tube is fixedly installed in the middle of the second mounting frame, the temperature-resistant insulation frame comprises a rectangular frame and side sealing plates, the front and back of the rectangular frame are fixedly connected to the side sealing plates, an inner channel is provided in the middle of the rectangular frame, a water pump is installed inside the water tank, and the output end of the water pump is connected to a water inlet pipe.

[0006] Preferably, the water pump is electrically connected to an external power supply, and an end of the water inlet pipe away from the water pump is connected to one side of the inner channel.

[0007] Preferably, one side of the bottom of the inner channel is connected to a return pipe, and one end of the return pipe away from the inner channel is connected to the top of the water tank.

[0008] Preferably, the smoke inlet pipe is fixedly connected to the interior of the heat-resistant insulation frame, and the smoke outlet pipe is fixedly connected to the interior of the heat-resistant insulation frame.

[0009] Preferably, the bottom of the air input pipe is fixedly connected to one end of the heat exchange pipe, and one end of the air output pipe is fixedly connected to the other end of the heat exchange pipe.

[0010] Preferably, the heat exchange tube is made of copper, and a plurality of heat-conducting fins are installed on the surface of the heat exchange tube.

[0011] Preferably, one end of the smoke inlet pipe, one end of the smoke outlet pipe, the top of the air inlet pipe and the top of the air outlet pipe are all installed with fixing flanges.

[0012] Preferably, a sealing cover plate is installed in the middle of the front side of the heat exchange shell, and the sealing cover plate is fixed to the heat exchange shell by bolts.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The flue gas enters the temperature-resistant insulation frame inside the heat exchange shell through the flue gas inlet pipe. The temperature inside the temperature-resistant insulation frame will be higher due to the presence of flue gas, and the air enters the heat exchange tube through the air inlet pipe. When flowing inside the heat exchange tube, it is radiated by the temperature inside the temperature-resistant insulation frame. The air temperature passing through the heat exchange tube becomes hot, and the heat exchange work is completed. During the process of heat exchange by introducing flue gas, the temperature-resistant insulation frame is located on the inner side of the heat exchange shell to isolate the flue gas, so that the temperature inside the heat exchange shell is greatly reduced. Starting the water pump can continuously circulate cold water through the inner channel of the temperature-resistant insulation frame. The cold water will take away some heat from the temperature-resistant insulation frame during the process of flowing through the inner channel, thereby avoiding the high temperature of the temperature-resistant insulation frame from radiating to the inside of the heat exchange shell. The entire heat exchanger prevents the temperature inside the heat exchange shell from being in a high temperature state, that is, the temperature at the shell cover position of the heat exchanger will not be high, and the weld at the connection of the side plate of the outer shell will not crack due to thermal expansion, thereby extending the service life of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 This is the internal structure diagram of the heat exchange shell of the utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the heat-resistant and heat-insulating frame of the utility model;

[0018] Figure 4 This is the internal structure diagram of the water tank of the utility model.

[0019] In the figure: 1. heat exchange shell; 2. base; 3. water tank; 4. flue gas inlet pipe; 5. flue gas outlet pipe; 6. air inlet pipe; 7. air outlet pipe; 8. fixing flange; 9. sealing cover plate; 10. first mounting frame; 11. heat-resistant insulation frame; 12. second mounting frame; 13. heat exchange tube; 14. rectangular frame; 15. side sealing plate; 16. inner channel; 17. water inlet pipe; 18. return pipe; 19. water pump; 20. heat-conducting fins. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-4 The utility model provides a high-efficiency air heat exchanger for a waste heat boiler with a long service life, comprising a heat exchange shell 1, a base 2 is connected to the bottom of the heat exchange shell 1, a water tank 3 is installed at the bottom of the base 2, a smoke input pipe 4 is connected to one side of the heat exchange shell 1, a smoke output pipe 5 is connected to the other side of the heat exchange shell 1, an air input pipe 6 is connected to one side of the top of the heat exchange shell 1, and an air output pipe 7 is connected to the other side of the top of the heat exchange shell 1, a first mounting frame 10 is connected to the inner wall of the heat exchange shell 1, a temperature-resistant heat-insulating frame 11 is fixedly installed in the middle of the first mounting frame 10, and a second mounting frame 12 is connected to the inner wall of the temperature-resistant heat-insulating frame 11, A heat exchange tube 13 is fixedly installed in the middle of the second mounting frame 12, the temperature-resistant heat-insulating frame 11 includes a rectangular frame 14 and a side sealing plate 15, the front and back of the rectangular frame 14 are fixedly connected with the side sealing plate 15, the middle of the rectangular frame 14 is provided with an inner channel 16, a water pump 19 is installed inside the water tank 3, the output end of the water pump 19 is connected with a water inlet pipe 17, one end of the smoke inlet pipe 4, one end of the smoke outlet pipe 5, the top of the air inlet pipe 6 and the top of the air outlet pipe 7 are all installed with a fixing flange 8, a sealing cover plate 9 is installed in the middle of the front of the heat exchange shell 1, and the sealing cover plate 9 is fixed to the heat exchange shell 1 by bolts;

[0022] In this embodiment, the flue gas enters the temperature-resistant insulation frame 11 inside the heat exchange shell 1 through the flue gas inlet pipe 4. The temperature inside the temperature-resistant insulation frame 11 will be relatively high due to the presence of the flue gas. The air enters the heat exchange tube 13 through the air inlet pipe 6. When flowing inside the heat exchange tube 13, it is radiated by the temperature inside the temperature-resistant insulation frame 11. The air temperature passing through the heat exchange tube 13 becomes hot, completing the heat exchange work, and is finally discharged through the air output pipe 7.

[0023] See also Figure 1-4, the water pump 19 is electrically connected to the external power supply, the end of the water inlet pipe 17 away from the water pump 19 is connected to one side of the inner channel 16, one side of the bottom of the inner channel 16 is connected to a return pipe 18, and the end of the return pipe 18 away from the inner channel 16 is connected to the top of the water tank 3;

[0024] In the present embodiment, during the process of heat exchange by passing the flue gas, the temperature-resistant insulation frame 11 is located inside the heat exchange shell 1 to isolate the flue gas, so that the temperature inside the heat exchange shell 1 is greatly reduced. Starting the water pump 19 can continuously circulate cold water through the inner channel 16 of the temperature-resistant insulation frame 11. The cold water will take away some heat from the temperature-resistant insulation frame 11 during the process of flowing through the inner channel 16, thereby preventing the high temperature of the temperature-resistant insulation frame 11 from radiating to the interior of the heat exchange shell 1.

[0025] See also Figure 1-4 , the smoke inlet pipe 4 is fixedly connected to the interior of the heat-resistant insulation frame 11, the smoke outlet pipe 5 is fixedly connected to the interior of the heat-resistant insulation frame 11, the bottom of the air inlet pipe 6 is fixedly connected to one end of the heat exchange pipe 13, one end of the air outlet pipe 7 is fixedly connected to the other end of the heat exchange pipe 13, the heat exchange pipe 13 is made of copper, and a plurality of heat-conducting fins 20 are installed on the surface of the heat exchange pipe 13;

[0026] In this embodiment, the flue gas of the boiler is introduced into the interior of the heat exchange shell 1 through the flue gas inlet pipe 4, and the flue gas is discharged through the flue gas outlet pipe 5. The air that needs heat exchange treatment is introduced through the air inlet pipe 6, and the hot air is discharged through the air outlet pipe 7.

[0027] When in use, the utility model is a high-efficiency air heat exchanger for a waste heat boiler with a long service life. During use, the flue gas of the boiler is introduced into the interior of the heat exchange shell 1 through the flue gas inlet pipe 4, and the flue gas is discharged through the flue gas outlet pipe 5. The air that needs heat exchange treatment is introduced through the air inlet pipe 6, and the hot air is discharged through the air outlet pipe 7. The flue gas enters the temperature-resistant insulation frame 11 inside the heat exchange shell 1 through the flue gas inlet pipe 4. The temperature inside the temperature-resistant insulation frame 11 will be higher due to the presence of flue gas, and the air enters the heat exchange tube 13 through the air inlet pipe 6. When flowing inside the heat exchange tube 13, it is radiated by the temperature inside the temperature-resistant insulation frame 11. The air temperature passing through the heat exchange tube 13 becomes hot, completing the heat exchange work, and finally being discharged through the air outlet pipe 7. The waste heat of the flue gas is used for air exchange Heat can be introduced into the water to exchange heat with the water and utilize the waste heat of the flue gas. In the process of introducing the flue gas for heat exchange, the heat-resistant insulation frame 11 is located on the inner side of the heat exchange shell 1 to isolate the flue gas, so that the temperature inside the heat exchange shell 1 is greatly reduced. The water tank 3 is filled with cold water. Starting the water pump 19 can continuously circulate the cold water through the inner channel 16 of the heat-resistant insulation frame 11. The cold water will take away some heat from the heat-resistant insulation frame 11 during the process of flowing through the inner channel 16, thereby preventing the high temperature of the heat-resistant insulation frame 11 from radiating to the inside of the heat exchange shell 1. The entire heat exchanger ensures that the temperature inside the heat exchange shell 1 will not be in a high temperature state, and the temperature at the shell cover of the heat exchanger will not be high, so that the weld at the connection between the side panels of the outer shell will not crack due to thermal expansion, thereby extending the service life of the heat exchanger.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency air heat exchanger for a waste heat boiler with a long service life, comprising a heat exchange shell (1), characterized in that: The bottom of the heat exchange shell (1) is connected to a base (2), a water tank (3) is installed at the bottom of the base (2), one side of the heat exchange shell (1) is connected to a smoke inlet pipe (4), the other side of the heat exchange shell (1) is connected to a smoke outlet pipe (5), one side of the top of the heat exchange shell (1) is connected to an air inlet pipe (6), the other side of the top of the heat exchange shell (1) is connected to an air outlet pipe (7), the inner wall of the heat exchange shell (1) is connected to a first mounting frame (10), and a temperature-resistant heat-insulating frame is fixedly installed in the middle of the first mounting frame (10). (11), the inner wall of the temperature-resistant insulation frame (11) is connected to a second mounting frame (12), a heat exchange tube (13) is fixedly mounted in the middle of the second mounting frame (12), the temperature-resistant insulation frame (11) comprises a rectangular frame (14) and a side sealing plate (15), the front side of the rectangular frame (14) and the back side of the rectangular frame (14) are both fixedly connected to the side sealing plate (15), an inner channel (16) is provided in the middle of the rectangular frame (14), a water pump (19) is installed inside the water tank (3), and the output end of the water pump (19) is connected to a water inlet pipe (17).

2. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: The water pump (19) is electrically connected to an external power source, and one end of the water inlet pipe (17) away from the water pump (19) is in communication with one side of the inner channel (16).

3. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: One side of the bottom of the inner channel (16) is connected to a return pipe (18), and one end of the return pipe (18) away from the inner channel (16) is connected to the top of the water tank (3).

4. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: The smoke inlet pipe (4) is fixedly connected to the interior of the heat-resistant insulation frame (11), and the smoke outlet pipe (5) is fixedly connected to the interior of the heat-resistant insulation frame (11).

5. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: The bottom of the air input pipe (6) is fixedly connected to one end of the heat exchange pipe (13), and one end of the air output pipe (7) is fixedly connected to the other end of the heat exchange pipe (13).

6. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: The heat exchange tube (13) is made of copper, and a plurality of heat conduction fins (20) are installed on the surface of the heat exchange tube (13).

7. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: One end of the smoke inlet pipe (4), one end of the smoke outlet pipe (5), the top of the air inlet pipe (6) and the top of the air outlet pipe (7) are all installed with a fixing flange (8).

8. The high-efficiency air heat exchanger for waste heat boiler with long service life according to claim 1, characterized in that: A sealing cover plate (9) is installed in the middle of the front side of the heat exchange shell (1), and the sealing cover plate (9) is fixed to the heat exchange shell (1) by means of bolts.

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