Flue gas waste heat recovery heating device and system

Abstract

The invention discloses a flue gas waste heat recovery heating device and system, and particularly relates to the field of flue gas waste heat recovery, the flue gas waste heat recovery heating device comprises a heat exchanger, the heat exchanger comprises a shell, the upper side and the lower side of the shell are provided with a flue gas inlet and a flue gas outlet respectively, and flue gas enters the shell from the flue gas inlet and is discharged from the flue gas outlet; a plurality of heat exchange pipes used for cooling water circulation are arranged in the shell, and the length direction of the heat exchange pipes is arranged in the axial direction of the shell. A cleaning hopper is arranged in the shell and arranged on the outer sides of all the heat exchange pipes in a sleeving mode. The flue gas waste heat recovery heating device further comprises a lifting device, and the lifting device is used for controlling the cleaning hopper to ascend and descend in the shell. Through the arrangement of the cleaning hopper and the lifting device, the lifting device drives the cleaning hopper to move upwards along the heat exchange pipe to scrape impurities attached to the surface of the heat exchange pipe, condensate water generated in the heat exchange process of smoke is utilized, the purpose of cleaning the surface of the heat exchange pipe can be achieved, and therefore the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas waste heat recovery, and more specifically, the present invention relates to a flue gas waste heat recovery heating device and system. Background Art

[0002] Steam boilers play an important role in the national economy and are the main chemical energy / heat energy conversion equipment, with a thermal efficiency between 87% and 94%. The factors affecting the thermal efficiency of the boiler are heat loss due to flue gas, heat loss due to incomplete combustion of gas, heat loss due to incomplete mechanical combustion, heat dissipation loss, and physical heat loss of fuel. Among them, it is the most important item in the heat loss of gas boilers.

[0003] Flue gas waste heat recovery mainly uses heat exchangers to transfer the waste heat of the flue gas to cooling water. After the cooling water is heated, it is stored in a storage tank and can be used for heating in life or office, or for domestic water. However, the flue gas contains more impurities, and these impurities adhere to the heat exchange tubes, which will affect the heat exchange efficiency of the heat exchange tubes. The thicker the impurities, the lower the heat exchange efficiency. Summary of the Invention

[0004] A flue gas waste heat recovery heating device and system provided by the present invention aim to solve the problem that the flue gas contains more impurities, and these impurities adhere to the heat exchange tubes, which will affect the heat exchange efficiency of the heat exchange tubes. The thicker the impurities, the lower the heat exchange efficiency.

[0005] To achieve the above object, the present invention provides the following technical solution: A flue gas waste heat recovery heating device includes a heat exchanger. The heat exchanger includes a housing. An inlet for flue gas and an outlet for flue gas are respectively provided on the upper side and the lower side of the housing. The flue gas enters the housing through the inlet for flue gas and exits through the outlet for flue gas. A plurality of heat exchange tubes for cooling water circulation are arranged inside the housing, and the length direction of the heat exchange tubes is arranged along the axial direction of the housing. A cleaning hopper is arranged inside the housing, and the cleaning hopper is sleeved outside all the heat exchange tubes. The flue gas waste heat recovery heating device further includes a lifting device, and the lifting device is used to control the lifting of the cleaning hopper inside the housing.

[0006] In a preferred embodiment, an inlet and outlet assembly is provided at the top of the housing. The inlet and outlet assembly is fixedly connected to the top of the housing. An inlet for water and an outlet for water are respectively provided on both sides of the inlet and outlet assembly. A partition is fixedly connected to the middle of the inlet and outlet assembly, and the partition separates the inlet for water and the outlet for water. The heat exchange tubes are of a U-shaped structure, and the two ends of the heat exchange tubes are respectively connected to the inlet for water and the outlet for water, and the outlet for water is connected to a storage tank.

[0007] In a preferred embodiment, the lifting device includes a double-shaft motor fixedly installed on the top of the inlet and outlet assembly. Both ends of the output shaft of the double-shaft motor are fixedly connected with winding wheels. Steel wire ropes are wound around both winding wheels. The two steel wire ropes pass through the inlet and outlet assembly and the housing and are fixedly connected to the cleaning hopper.

[0008] In a preferred embodiment, a bottom case is fixedly connected to the bottom of the housing, the bottom end of the heat exchange tube extends into the interior of the bottom case, a conical opening is formed in one side of the bottom of the cleaning hopper, and a control assembly is arranged on one side inside the bottom case, and the control assembly is used to control the opening or closing of the conical opening.

[0009] In a preferred embodiment, the control assembly includes a control rod fixedly connected to the cleaning hopper. A sphere is arranged inside the conical opening, the sphere is movably sleeved on the control rod, a spring is sleeved on the control rod, and two ends of the spring are respectively pressed against the top of the cleaning hopper and the upper end of the sphere.

[0010] In a preferred embodiment, a fixed tube is fixedly connected to the position directly below the conical opening inside the bottom case. A connecting rod is fixedly connected inside the fixed tube, the connecting rod is used to upwardly press the sphere, a through hole is formed in the bottom of the connecting rod, and the control rod movably penetrates through the connecting rod.

[0011] In a preferred embodiment, a water tank is fixedly connected to the bottom of the bottom case. One side of the water tank has a water pipe, and a liquid level sensor is installed at the upper end of the water pipe, and the liquid level sensor is used to detect the water level inside the water tank.

[0012] In a preferred embodiment, a water outlet component is arranged at the bottom of the water tank. The water outlet component includes a control disk which is rotatably connected to the water tank through a torsion spring. Water outlet holes II are formed in the circumferential direction of the control disk, a water outlet hole I is formed in the bottom of the water tank, a middle hole is formed in the middle of the control disk, a spiral groove is formed in the inner wall of the middle hole, and a convex block is radially and telescopically installed on the side wall of the bottom end of the control rod, and the convex block can slide inside the spiral groove.

[0013] In a preferred embodiment, a plurality of rubber sleeves are fixedly connected to the inner bottom of the cleaning hopper, and the rubber sleeves are sleeved on the outer surfaces of a plurality of heat exchange tubes.

[0014] The present invention also provides a flue gas waste heat recovery heating system, which includes the above-mentioned flue gas waste heat recovery heating device, and also includes a control module. The control module controls the lifting device to drive the cleaning hopper to lift according to the water level information inside the water tank detected by the liquid level sensor.

[0015] Technical effects and advantages of the present invention: Through the arrangement of the cleaning hopper and the lifting device, the lifting device drives the cleaning hopper to move upward along the heat exchange tube to scrape off impurities attached to the surface of the heat exchange tube. By using the condensed water generated during the heat exchange process of the flue gas, the purpose of cleaning the surface of the heat exchange tube can be achieved, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 Cross-section of the present invention Figure 1 .

[0018] Figure 3 Cross-section of the present invention Figure 2 .

[0019] Figure 4 This is the present invention Figure 3 Enlarged view of the local structure at position A in the present invention.

[0020] Figure 5 Schematic diagram of the local structure of the present invention Figure 1 .

[0021] Figure 6 Schematic diagram of the local structure of the present invention Figure 2 .

[0022] Figure 7 Schematic diagram of the structure of the water outlet component of the present invention.

[0023] Figure 8 System block diagram of the present invention.

[0024] Reference numerals in the drawings are: 1, housing; 11, smoke inlet; 12, smoke outlet; 13, bottom shell; 2, heat exchange tube; 3, cleaning hopper; 31, conical opening; 4, lifting device; 41, dual-axis motor; 42, winding wheel; 43, steel wire rope; 5, water inlet and outlet assembly; 51, partition; 52, water inlet; 53, water outlet; 6, control assembly; 61, control rod; 62, sphere; 63, spring; 64, fixed tube; 65, connecting rod; 651, through hole; 7, water tank; 711, water pipe; 712, first water outlet hole; 72, liquid level sensor; 73, water outlet component; 731, control panel; 732, second water outlet hole; 733, middle hole; 734, spiral groove; 735, convex block; 8, rubber sleeve; 9, control module. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Refer to the attached drawings of the specification Figures 1 - 8, A flue gas waste heat recovery heating device, including a heat exchanger. The heat exchanger includes a housing 1. An inlet flue gas port 11 and an outlet flue gas port 12 are respectively arranged on the upper side and the lower side of the housing 1. Flue gas enters the housing 1 from the inlet flue gas port 11 and discharges from the outlet flue gas port 12. A number of heat exchange tubes 2 for cooling water circulation are arranged inside the housing 1. The length direction of the heat exchange tubes 2 is arranged along the axial direction of the housing 1. A cleaning hopper 3 is arranged inside the housing 1. The cleaning hopper 3 is sleeved outside all the heat exchange tubes 2. The flue gas waste heat recovery heating device further includes a lifting device 4. The lifting device 4 is used to control the lifting of the cleaning hopper 3 inside the housing 1.

[0027] In this embodiment, as Figures 1 - 3 shown, an inlet and outlet water assembly 5 is arranged at the top of the housing 1. The inlet and outlet water assembly 5 is fixedly connected to the top of the housing 1. An inlet water port 52 and an outlet water port 53 are respectively arranged on both sides of the inlet and outlet water assembly 5. A partition 51 is fixedly connected to the middle of the inlet and outlet water assembly 5. The partition 51 separates the inlet water port 52 and the outlet water port 53. The heat exchange tubes 2 are of U-shaped structure. The two ends of the heat exchange tubes 2 are respectively connected and communicated with the inlet water port 52 and the outlet water port 53. The outlet water port 53 is connected to a storage tank.

[0028] It should be noted that the cooling water enters the left side of the partition 51 from the inlet water port 52, then enters the right side of the partition 51 from the U-shaped heat exchange tubes 2, and then discharges from the outlet water port 53 to the storage tank, and can be used for living or office heating or domestic water.

[0029] In this embodiment, as Figure 2 shown, the lifting device 4 includes a double-shaft motor 41 fixedly installed at the top of the inlet and outlet water assembly 5. Both ends of the output shaft of the double-shaft motor 41 are fixedly connected with winding wheels 42. Steel wire ropes 43 are wound on both winding wheels 42. The two steel wire ropes 43 pass through the inlet and outlet water assembly 5 and the housing 1 and are fixedly connected with the cleaning hopper 3.

[0030] It should be noted that the so-called double-shaft motor 41 means that both ends of the output shaft extend to both sides and can respectively install winding wheels 42. When the output shaft rotates, the two winding wheels 42 also rotate together. When the winding wheels 42 wind the steel wire ropes 43, the steel wire ropes 43 can pull the cleaning hopper 3 to move upward. When the winding wheels 42 unwind, the cleaning hopper 3 moves downward under the action of gravity.

[0031] In this embodiment, the implementation method is specifically as follows: during operation, cooling water is introduced from the water inlet 52, and then flows out from the water outlet 53 to the storage tank after passing through the heat exchange tube 2. Flue gas is introduced into the interior of the housing 1 from the flue gas inlet 11, and is discharged from the flue gas outlet 12 after heat exchange through the heat exchange tube 2. During this process, impurities in the flue gas adhere to the heat exchange tube 2. The flue gas contains 7-11% (volume ratio) of water vapor, and condensed water will be generated during heat exchange. The condensed water drips down into the interior of the cleaning bucket 3. When a certain amount of water is stored in the cleaning bucket 3, the double-shaft motor 41 drives the winding wheel 42 to rotate, and the winding wheel 42 winds the steel wire rope 43 to drive the cleaning bucket 3 to move upward. When the cleaning bucket 3 moves upward, the impurities on the surface of the heat exchange tube 2 are scraped into the interior of the cleaning bucket 3 and mixed with the water inside the cleaning bucket 3. When the cleaning bucket 3 moves to the uppermost end, the steel wire rope 43 is unwound, and the cleaning bucket 3 moves downward to the bottom of the housing 1 under the action of gravity.

[0032] Through the arrangement of the cleaning bucket 3 and the lifting device 4 in the above technical solution, the lifting device 4 drives the cleaning bucket 3 to move upward along the heat exchange tube 2 to scrape the impurities attached to the surface of the heat exchange tube 2. By using the condensed water generated during the heat exchange of the flue gas, the surface of the heat exchange tube 2 can be cleaned, thereby improving the heat exchange efficiency.

[0033] Further, as Figure 5 and Figure 6 shown, a plurality of rubber sleeves 8 are fixedly connected to the bottom inside the cleaning bucket 3, and the rubber sleeves 8 are sleeved on the outer surfaces of a plurality of heat exchange tubes 2.

[0034] It should be noted that the rubber sleeve 8 is made of corrosion-resistant rubber material. Through the arrangement of the rubber sleeve 8, the impurities on the surface of the heat exchange tube 2 can be better scraped off, and the surface of the heat exchange tube 2 will not be damaged.

[0035] Referring to the attached drawings of the specification Figures 2 - 8 , a bottom shell 13 is fixedly connected to the bottom of the housing 1, the bottom end of the heat exchange tube 2 extends into the interior of the bottom shell 13, a tapered opening 31 is formed on one side of the bottom of the cleaning bucket 3, and a control assembly 6 is arranged on one side inside the bottom shell 13. The control assembly 6 is used to control the opening or closing of the tapered opening 31.

[0036] Further, the control assembly 6 includes a control rod 61, the control rod 61 is fixedly connected to the cleaning bucket 3, a sphere 62 is arranged inside the tapered opening 31, the sphere 62 is movably sleeved on the control rod 61, a spring 63 is sleeved on the control rod 61, and the two ends of the spring 63 are respectively pressed against the top of the cleaning bucket 3 and the upper end of the sphere 62.

[0037] Further, a fixed pipe 64 is fixedly connected inside the bottom shell 13 at a position directly below the conical opening 31. A connecting rod 65 is fixedly connected inside the fixed pipe 64. The connecting rod 65 is used to upwardly press the sphere 62. A through hole 651 is formed at the bottom of the connecting rod 65, and the control rod 61 movably penetrates through the connecting rod 65.

[0038] Further, a water tank 7 is fixedly connected to the bottom of the bottom shell 13. One side of the water tank 7 has a water pipe 711. A liquid level sensor 72 is installed at the upper end of the water pipe 711. The liquid level sensor 72 is used to detect the water level inside the water tank 7.

[0039] Still further, a water outlet component 73 is arranged at the bottom of the water tank 7. The water outlet component 73 includes a control disk 731. The control disk 731 is rotatably connected to the water tank 7 through a torsion spring. A second water outlet hole 732 is formed in the circumferential direction of the control disk 731. A first water outlet hole 712 is formed at the bottom of the water tank 7. A middle hole 733 is formed in the middle of the control disk 731. A spiral groove 734 is formed in the inner wall of the middle hole 733. A convex block 735 is radially and telescopically installed on the side wall of the bottom end of the control rod 61. The convex block 735 can slide inside the spiral groove 734.

[0040] It should be noted that the convex block 735 is installed on the control rod 61 through a compression spring and can move along the radial direction of the control rod 61.

[0041] In this embodiment, the implementation manner is specifically as follows: Initially, the cleaning bucket 3 is located at the bottom of the housing 1. The connecting rod 65 upwardly pushes the sphere 62 to open the conical opening 31, and the first water outlet hole 712 and the second water outlet hole 732 are staggered. During the heat exchange process, the condensed water drops into the cleaning bucket 3 and flows into the water tank 7 from the position of the conical opening 31. The liquid level sensor 72 detects the water level. When it detects that the water level reaches a certain height inside the cleaning bucket 3, the lifting device 4 controls the cleaning bucket 3 to move upward to scrape the impurities on the surface of the heat exchange tube 2. When the cleaning bucket 3 moves upward, the sphere 62 separates from the connecting rod 65. Under the action of the spring 63, the sphere 62 presses on the inner surface of the conical opening 31 to close the conical opening 31. When the impurities are scraped off, when the cleaning bucket 3 moves downward to the bottom of the housing 1 but is not completely in contact with the bottom of the housing 1 (the first process), the connecting rod 65 upwardly pushes the sphere 62 to open the conical opening 31, and the condensed water and impurities flow into the water tank 7 from the conical opening 31. At the same time, the bottom of the control rod 61 enters the middle hole 733, and the convex block 735 slides inside the spiral groove 734. Through the action of the spiral groove 734, the control disk 731 rotates. When the second water outlet hole 732 is aligned with the first water outlet hole 712, the condensed water and impurities flow out from the positions of the second water outlet hole 732 and the first water outlet hole 712. When the outflow is completed, the cleaning bucket 3 continues to move downward (the second process), and the control disk 731 continues to rotate to stagger the second water outlet hole 732 and the first water outlet hole 712.

[0042] The condensed water generated by subsequent heat exchange continues to be stored inside the water tank 7 and the cleaning bucket 3.

[0043] Among them, the compression spring at the position of the bump 735 is reasonably selected so that it can overcome the elastic force of the torsion spring at the position of the control disk 731, so that the second water outlet hole 732 can be aligned with the first water outlet hole 712.

[0044] It should also be noted that when the cleaning bucket 3 drives the control rod 61 to move upward, the bump 735 contacts the bottom of the connecting rod 65 and is received into the inside of the control rod 61. When the cleaning bucket 3 drives the control rod 61 to move downward, the bump 735 can also contact the top of the connecting rod 65 and be received into the inside of the control rod 61, so that the control rod 61 can pass through the connecting rod 65 smoothly. In addition, when the control rod 61 moves upward, the control disk 731 will reverse under the action of the torsion spring, and the second water outlet hole 732 and the first water outlet hole 712 will coincide for a short time, and a small amount of condensed water will flow out, which does not affect the scraping operation of the impurities on the surface of the heat exchange tube 2.

[0045] Refer to the attached drawings of the specification Figures 1 - 8 In addition, this embodiment also provides a flue gas waste heat recovery heating system, which includes the above-mentioned flue gas waste heat recovery heating device, and also includes a control module 9. The control module 9 controls the lifting device 4 to drive the cleaning bucket 3 to lift and lower according to the water level information inside the water tank 7 detected by the liquid level sensor 72.

[0046] It should be noted that the liquid level sensor 72 detects the water level. When the water level reaches the set first water level value, the lifting device 4 controls the cleaning bucket 3 to move upward to scrape the impurities on the surface of the heat exchange tube 2. And in the above first process, the liquid level sensor 72 also detects the water level value. When it reaches the set second water level value, the lifting device 4 controls the cleaning bucket 3 to move downward to perform the second process.

[0047] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, 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 flue gas waste heat recovery heating device, characterized in that: It includes a heat exchanger, and the heat exchanger includes a housing (1). An inlet flue gas port (11) and an outlet flue gas port (12) are respectively arranged on the upper side and the lower side of the housing (1). Flue gas enters the housing (1) from the inlet flue gas port (11) and is discharged from the outlet flue gas port (12). A plurality of heat exchange tubes (2) for cooling water circulation are arranged inside the housing (1), and the length direction of the heat exchange tubes (2) is arranged along the axial direction of the housing (1). A cleaning hopper (3) is arranged inside the housing (1), and the cleaning hopper (3) is sleeved outside all the heat exchange tubes (2). The flue gas waste heat recovery heating device further includes a lifting device (4), and the lifting device (4) is used to control the lifting of the cleaning hopper (3) inside the housing (1).

2. The flue gas waste heat recovery heating device according to claim 1, characterized in that: An inlet and outlet water assembly (5) is arranged at the top of the housing (1), and the inlet and outlet water assembly (5) is fixedly connected to the top of the housing (1). An inlet water port (52) and an outlet water port (53) are respectively arranged on both sides of the inlet and outlet water assembly (5). A partition plate (51) is fixedly connected to the middle of the inlet and outlet water assembly (5), and the partition plate (51) separates the inlet water port (52) and the outlet water port (53). The heat exchange tube (2) is of a U-shaped structure, and both ends of the heat exchange tube (2) are respectively communicated with the inlet water port (52) and the outlet water port (53), and the outlet water port (53) is connected to a storage tank.

3. The flue gas waste heat recovery heating device according to claim 2, characterized in that: The lifting device (4) includes a double-shaft motor (41) fixedly installed on the top of the inlet and outlet water assembly (5). Reel wheels (42) are fixedly connected to both ends of the output shafts of the double-shaft motor (41). Steel wire ropes (43) are wound on both of the reel wheels (42). The two steel wire ropes (43) pass through the inlet and outlet water assembly (5) and the housing (1) and are fixedly connected to the cleaning hopper (3).

4. The flue gas waste heat recovery heating device according to claim 3, wherein: A bottom shell (13) is fixedly connected to the bottom of the housing (1), and the bottom ends of the heat exchange tubes (2) extend into the inside of the bottom shell (13). A conical opening (31) is formed on one side of the bottom of the cleaning hopper (3). A control assembly (6) is arranged on one side inside the bottom shell (13), and the control assembly (6) is used to control the opening or closing of the conical opening (31).

5. The flue gas waste heat recovery heating device according to claim 4, characterized in that: The control assembly (6) includes a control rod (61), and the control rod (61) is fixedly connected to the cleaning hopper (3). A sphere (62) is arranged inside the conical opening (31), and the sphere (62) is movably sleeved on the control rod (61). A spring (63) is sleeved on the control rod (61), and both ends of the spring (63) are respectively pressed against the top of the cleaning hopper (3) and the upper end of the sphere (62).

6. The flue gas waste heat recovery heating device according to claim 5, characterized in that: A fixed tube (64) is fixedly connected to the position directly below the conical opening (31) inside the bottom shell (13). A connecting rod (65) is fixedly connected to the inside of the fixed tube (64), and the connecting rod (65) is used to upwardly press the sphere (62). A through hole (651) is formed at the bottom of the connecting rod (65), and the control rod (61) movably penetrates through the connecting rod (65).

7. The flue gas waste heat recovery heating device according to claim 6, characterized in that: A water tank (7) is fixedly connected to the bottom of the bottom shell (13). One side of the water tank (7) is provided with a water pipe (711). A liquid level sensor (72) is installed at the upper end of the water pipe (711). The liquid level sensor (72) is used to detect the water level inside the water tank (7).

8. The flue gas waste heat recovery heating device according to claim 7, wherein: An outlet component (73) is arranged at the bottom of the water tank (7). The outlet component (73) includes a control disk (731). The control disk (731) is rotationally connected to the water tank (7) through a torsion spring. Second outlet holes (732) are formed in the circumferential direction of the control disk (731). First outlet holes (712) are formed in the bottom of the water tank (7). A middle hole (733) is formed in the middle of the control disk (731). A spiral groove (734) is formed in the inner wall of the middle hole (733). A convex block (735) is radially and telescopically installed on the side wall of the bottom end of the control rod (61). The convex block (735) can slide inside the spiral groove (734).

9. The flue gas waste heat recovery heating device according to claim 8, wherein: A plurality of rubber sleeves (8) are fixedly connected to the inner bottom of the cleaning hopper (3). The rubber sleeves (8) are sleeved on the outer surfaces of a plurality of heat exchange tubes (2).

10. A flue gas waste heat recovery heating system, comprising the flue gas waste heat recovery heating device according to any one of claims 9, characterized in that: It further includes a control module (9). The control module (9) controls the lifting device (4) to drive the cleaning hopper (3) to lift or lower according to the water level information inside the water tank (7) detected by the liquid level sensor (72).

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