Horizontal tubular air preheater with turbolator

Abstract

The utility model relates to a horizontal tubular air preheater with turbolators, which is characterized in that a first-stage air preheater and a second-stage air preheater are arranged in a frame, a plurality of turbolator heat exchange tubes are respectively arranged in the first-stage air preheater and the second-stage air preheater, flue gas sequentially and transversely scours the second-stage air preheater and the first-stage air preheater, and the turbolator heat exchange tubes are arranged in the first-stage air preheater and the second-stage air preheater. Flue gas and air flow in the countercurrent direction, the flue gas exchanges heat with the air in the turbolator heat exchange tubes, and a plurality of rows of guide plates are obliquely arranged at the top and the bottom of the frame respectively to prevent the flue gas from forming flue gas corridors on the upper side and the lower side. The turbulent flow is increased, so that the thickness of a retention bottom of main heat resistance of convective heat transfer is reduced, heat transfer is enhanced, and the heat transfer coefficient K is increased by 50% compared with that of a common tubular preheater.

Description

TECHNICAL FIELD

[0001] The utility model relates to a horizontal tubular air preheater with spoiler. BACKGROUND

[0002] The air preheater is widely used after the coal economizer of the flue tail of the incinerator. SUMMARY

[0003] The air preheater with spoiler can make the air produce spiral flow and secondary circulation in the pipe after the spoiler is added.

[0004] To achieve the above purpose, the utility model adopts the technical scheme of:

[0005] The horizontal tubular air preheater with spoiler is characterized in that: a first air preheater and a second air preheater are arranged in the frame, a plurality of spoiler heat exchange pipes are arranged in the first air preheater and the second air preheater respectively, flue gas flows transversely through the second air preheater and the first air preheater in turn, the flue gas and the air flow in the opposite direction, the flue gas exchanges heat with the air in the spoiler heat exchange pipe, a plurality of rows of guide plates are arranged on the top and the bottom of the frame respectively to prevent the flue gas from forming a flue gas corridor on the upper and lower sides.

[0006] A first air preheater partition plate is arranged horizontally in the middle of the first air preheater, one end of the first air preheater partition plate is fixed, and the other end is not fixed, the fixed end is located at the flue gas outlet end of the first air preheater, a second air preheater partition plate is arranged horizontally in the middle of the second air preheater, one end of the second air preheater partition plate is fixed, and the other end is not fixed, and the fixed end is located at the flue gas inlet end of the second air preheater.

[0007] The spoiler heat exchange pipes are provided with twisted steel spoilers in the form of twisted steel in the two ends respectively, the twisted steel spoilers are connected through connecting round steel, the connecting round steel is located in the middle of the spoiler heat exchange pipe to prevent the twisted steel spoilers from moving, and the twisted steel spoilers are fixed in the two ends of the spoiler heat exchange pipe through fixed round steel respectively.

[0008] The horizontal tubular air preheater with the spoiler, wherein: the air inlet end of the first air preheater is provided with a first air preheater fixed end tube plate, the first air preheater fixed end tube plate is fixedly connected with the spoiler heat exchange pipe, the air outlet end of the first air preheater is respectively provided with a first air preheater sliding end tube plate and a first air preheater expansion joint, and the spoiler heat exchange pipe is slidingly connected with the first air preheater sliding end tube plate and the first air preheater expansion joint, so that the spoiler heat exchange pipe can freely expand to the sliding end after being heated.

[0009] The horizontal tubular air preheater with the spoiler, wherein: the air inlet end of the first air preheater is provided with a first air preheater fixed end tube plate, the first air preheater fixed end tube plate is fixedly connected with the spoiler heat exchange pipe, the air outlet end of the first air preheater is respectively provided with a first air preheater sliding end tube plate and a first air preheater expansion joint, and the spoiler heat exchange pipe is slidingly connected with the first air preheater sliding end tube plate and the first air preheater expansion joint, so that the spoiler heat exchange pipe can freely expand to the sliding end after being heated.

[0010] The horizontal tubular air preheater with the spoiler, wherein: the fixed ends of the first air preheater partition plate and the second air preheater partition plate are fixedly connected with the spoiler heat exchange pipe through positioning plates.

[0011] The horizontal tubular air preheater with the spoiler, wherein: the guide plates are welded and fixed with the top and bottom of the frame through triangular plates, and the guide plates can prevent the formation of a flue gas corridor on the upper and lower sides of the frame, thereby causing wear of the spoiler heat exchange pipe.

[0012] The horizontal tubular air preheater with the spoiler, wherein: the bottom of the frame is provided with a manhole door for checking, repairing and replacing the spoiler heat exchange pipe.

[0013] The horizontal tubular air preheater with the spoiler, wherein: the bottom of the frame is provided with a manhole door for checking, repairing and replacing the spoiler heat exchange pipe.

[0014] 1. High heat transfer coefficient: the spoiler (also known as a turbulent accelerator) significantly improves heat transfer efficiency by destroying the fluid boundary layer, increasing the flow path of the fluid in the pipe, and utilizing the fin effect. This effect is particularly evident in air preheaters, which can improve heat transfer coefficient and reduce preheater volume. Compared with ordinary heat exchange pipes, the spoiler has a higher heat transfer coefficient, which means that it can transfer heat more effectively.

[0015] 2. High-efficiency heat exchange: the spoiler air preheater adds a spoiler flat steel in the heat exchange pipe. By using this spoiler technology, the contact between the gas and the spoiler can produce high-speed flow, thereby achieving high-efficiency heat exchange and improving thermal efficiency.

[0016] 3. Energy saving and cost reduction: In the traditional heating system, heat energy is usually wasted. However, with the use of the spoiler air preheater, heat energy can be fully utilized, saving a large amount of energy, reducing production costs, and achieving perfect unity of economy, safety and reliability.

[0017] 4. Simple structure: The spoiler air preheater is designed simply and manufactured in a modular manner, greatly shortening the manufacturing and installation period.

[0018] 5. Reduction of vaporization noise: The spoiler, as a spiral plate, has a good spoiler effect on the water flow in the heat exchange pipe, making the temperature in the heat exchange pipe as uniform as possible and avoiding excessive temperature differences. This can reduce the generation of bubbles and eliminate vaporization noise, reduce the individual density of bubble groups, further reduce noise, and reduce vibration.

[0019] 6. The spoiler heat exchange pipe significantly improves the heat transfer coefficient and heat exchange efficiency through its unique design and mechanism, saving a large amount of production cost, reducing energy consumption, and having the advantage of reducing noise.

[0020] 7. Under the same conditions of smoke and air temperature, the temperature of the horizontal preheater is 10-30℃ higher than that of the vertical preheater. This is beneficial to improve corrosion and ash deposition.

[0021] 8. The corrosion site of the horizontal preheater is in the cold end of several rows of pipes, which is easy to design as a detachable structure, facilitating replacement and reducing maintenance workload. The corrosion site of the vertical preheater is at the root of the pipe, so the entire pipe box needs to be replaced.

[0022] 9. The inlet pipe plate of the high-temperature preheater is no longer located in the high-temperature flue gas, so the defects such as overheating, warping and deformation of the pipe plate are less likely to occur, improving the ash removal effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of a horizontal tube-type air preheater with spoilers.

[0024] Figure 2 is a left view of a horizontal tube-type air preheater with spoilers.

[0025] Figure 3 is a top view of a horizontal tube-type air preheater with spoilers.

[0026] Figure 4 is a structure diagram of a spoiler heat exchange pipe of a horizontal tube-type air preheater with spoilers.

[0027] Figure 5 is a partial enlarged view of the guide plate and the triangular plate.

[0028] Explanation of the reference numerals: 1-fixed end tube sheet of first-stage air preheater; 2-sliding end tube sheet of first-stage air preheater; 3-fixed end tube sheet of second-stage air preheater; 4-sliding end tube sheet of second-stage air preheater; 5-turbulator heat exchange tube, 6-expansion joint of first-stage air preheater; 7-expansion joint of second-stage air preheater; 8-partition of first-stage air preheater; 9-partition of second-stage air preheater; 10-positioning plate; 11-frame; 12-guide plate; 13-triangular plate; 14-manhole door; 15-turbulator flat steel; 16-connecting round steel; 17-fixed round steel; 18-first-stage air preheater; 19-second-stage air preheater. DETAILED DESCRIPTION

[0029] like Figures 1 to 5 The horizontal tubular air preheater with a spoiler is shown, characterized in that: a first-stage air preheater 18 and a second-stage air preheater 19 are arranged in the frame 11, and a plurality of spoiler heat exchange tubes 5 are respectively arranged in the first-stage air preheater 18 and the second-stage air preheater 19, and the two ends of the spoiler heat exchange tube 5 are respectively provided with a twisted spoiler flat steel 15, and the spoiler flat steels 15 are connected by connecting round steels 16. The connecting round steels 16 are located in the middle of the spoiler heat exchange tube 5 to prevent the spoiler flat steel from moving. The spoiler flat steels 15 are respectively fixed to the two ends of the spoiler heat exchange tube 5 by fixing round steels 17, and the flue gas flushes the two spoiler heat exchange tubes 5 horizontally in turn. The flue gas and the air flow in the countercurrent direction of the first-stage air preheater 19 and the first-stage air preheater 18, and the flue gas and the air exchange heat with the air in the spoiler heat exchange tube 5. The top and bottom of the frame 11 are respectively inclined to provide a plurality of rows of guide plates 12 to prevent the flue gas from forming flue gas corridors on the upper and lower sides. The guide plates 12 are welded and fixed to the top and bottom of the frame 11 through triangular plates 13. The guide plates 12 can prevent the flue gas from forming flue gas corridors on the upper and lower sides of the frame 11, causing wear of the spoiler heat exchange tube 5. A manhole door 14 is provided at the bottom of the frame 11 for inspection, maintenance and replacement of the spoiler heat exchange tube 5.

[0030] A first-stage air preheater partition 8 is horizontally arranged in the middle of the first-stage air preheater 18, one end of the first-stage air preheater partition 8 is fixed, and the other end is not fixed, and the fixed end is located at the flue gas outlet end of the first-stage air preheater 18. A second-stage air preheater partition 9 is horizontally arranged in the middle of the second-stage air preheater 19, one end of the second-stage air preheater partition 9 is fixed, and the other end is not fixed, and the fixed end is located at the flue gas inlet end of the second-stage air preheater 19.

[0031] The air inlet end of the primary air preheater 18 is provided with a primary air preheater fixed end tube plate 1, which is fixedly connected with the spoiler heat exchange tube 5. The air outlet end of the primary air preheater 18 is respectively provided with a primary air preheater sliding end tube plate 2 and a primary air preheater expansion joint 6, and the spoiler heat exchange tube 5 is slidingly connected with the primary air preheater sliding end tube plate 2 and the primary air preheater expansion joint 6, so that the spoiler heat exchange tube 5 can freely expand towards the sliding end after being heated.

[0032] The air inlet end of the secondary air preheater 19 is provided with a secondary air preheater fixed end tube plate 3, which is fixedly connected with the spoiler heat exchange tube 5. The air outlet end of the secondary air preheater baffle 9 is respectively provided with a secondary air preheater sliding end tube plate 4 and a secondary air preheater expansion joint 7, and the spoiler heat exchange tube 5 is slidingly connected with the secondary air preheater sliding end tube plate 4 and the secondary air preheater expansion joint 7, so that the spoiler heat exchange tube 5 can freely expand towards the sliding end after being heated.

[0033] The fixed end of the primary air preheater baffle 8 and the secondary air preheater baffle 9 is fixedly connected with the spoiler heat exchange tube 5 through the positioning plate 10.

[0034] In the embodiment, the flue gas first passes through the secondary air preheater 19 and then passes through the primary air preheater 18, and the air first enters the spoiler heat exchange tube 5 of the primary air preheater 18 and then enters the spoiler heat exchange tube 5 of the secondary air preheater 19. The flue gas and the air flow in countercurrent direction, and the flue gas exchanges heat with the air in the spoiler heat exchange tube 5. The air in the spoiler heat exchange tube 5 flows through the twisted spoiler flat steel 15, so that the gas and the spoiler can produce high-speed flow, thereby realizing efficient heat exchange and improving heat efficiency. The temperature in the spoiler heat exchange tube 5 is as uniform as possible, and the temperature difference is not too large. The flue gas passes through the plurality of row of guide plates 12, which are inclined in the same direction as the flue gas flow direction, so that the resistance of the flue gas can be avoided to be too large to cause ash plugging. In order to prevent the flue gas passage from being too large and the flue gas from being turbulent, thereby causing the primary air preheater 18 and the secondary air preheater 19 to vibrate, the primary air preheater baffle 8 and the secondary air preheater baffle 9 are fixed at one end and not fixed at the other end, so that the primary air preheater baffle 8 and the secondary air preheater baffle 9 can expand towards the movable end, that is, the unfixed end after being heated. The spoiler heat exchange tube 5 is fixed at the air inlet end and slidingly connected at the air outlet end, so that the spoiler heat exchange tube 5 can freely expand towards the sliding end after being heated, thereby maintaining the safety and stable operation of the boiler.

[0035] The above description is only illustrative in nature and is not intended to limit the present application, and those skilled in the art can make many modifications, changes or equivalents without departing from the spirit and scope defined by the claims.

Claims

1. A horizontal tubular air preheater with spoiler, characterized in that: The frame (11) is provided with a first-stage air preheater (18) and a second-stage air preheater (19), a plurality of turbulence sub heat exchange tubes (5) are arranged in the first-stage air preheater (18) and the second-stage air preheater (19) respectively, flue gas flows through the second-stage air preheater (19) and the first-stage air preheater (18) in turn, flue gas and air flow in countercurrent direction, flue gas exchanges heat with air in the turbulence sub heat exchange tubes (5), the top and bottom of the frame (11) are respectively provided with a plurality of rows of guide plates (12) arranged obliquely, so as to prevent flue gas from forming flue gas corridor on the upper and lower sides; The first-stage air preheater (18) is provided with a first-stage air preheater partition plate (8) arranged horizontally in the middle, one end of the first-stage air preheater partition plate (8) is fixed, and the other end is not fixed, the fixed end is located at the flue gas outlet end of the first-stage air preheater (18), the second-stage air preheater (19) is provided with a second-stage air preheater partition plate (9) arranged horizontally in the middle, one end of the second-stage air preheater partition plate (9) is fixed, and the other end is not fixed, and the fixed end is located at the flue gas inlet end of the second-stage air preheater (19); The turbulence sub heat exchange tubes (5) are respectively provided with turbulence flat steel (15) in the shape of a twisted thread at both ends, the turbulence flat steel (15) is connected by connecting round steel (16), the connecting round steel (16) is located in the middle of the turbulence sub heat exchange tubes (5), so as to prevent the turbulence flat steel from moving, and the turbulence flat steel (15) is fixed on both ends of the turbulence sub heat exchange tubes (5) by fixed round steel (17) respectively.

2. The horizontal tubular air preheater with spoiler according to claim 1, characterized in that: The first-stage air preheater (18) is provided with a first-stage air preheater fixed end tube plate (1) at the air inlet end, the first-stage air preheater fixed end tube plate (1) is fixedly connected with the turbulence sub heat exchange tubes (5), the first-stage air preheater (18) is respectively provided with a first-stage air preheater sliding end tube plate (2) and a first-stage air preheater expansion joint (6) at the air outlet end, the turbulence sub heat exchange tubes (5) are slidably connected with the first-stage air preheater sliding end tube plate (2) and the first-stage air preheater expansion joint (6), so as to allow the turbulence sub heat exchange tubes (5) to freely expand towards the sliding end after being heated.

3. The horizontal tubular air preheater with a turbulator according to claim 1, characterized in that: The second-stage air preheater (19) is provided with a second-stage air preheater fixed end tube plate (3) at the air inlet end, the second-stage air preheater fixed end tube plate (3) is fixedly connected with the turbulence sub heat exchange tubes (5), the second-stage air preheater partition plate (9) is respectively provided with a second-stage air preheater sliding end tube plate (4) and a second-stage air preheater expansion joint (7) at the air outlet end, the turbulence sub heat exchange tubes (5) are slidably connected with the second-stage air preheater sliding end tube plate (4) and the second-stage air preheater expansion joint (7), so as to allow the turbulence sub heat exchange tubes (5) to freely expand towards the sliding end after being heated.

4. The horizontal tubular air preheater with spoiler according to claim 1, characterized in that: The fixed ends of the first-stage air preheater partition plate (8) and the second-stage air preheater partition plate (9) are respectively fixedly connected with the turbulence sub heat exchange tubes (5) by positioning plates (10).

5. The horizontal tubular air preheater with a turbulator according to claim 1, characterized in that: The guide plates (12) are welded and fixed to the top and bottom of the frame (11) by triangular plates (13), the guide plates (12) can prevent flue gas from forming flue gas corridor on the upper and lower sides of the frame (11), and cause wear of the turbulence sub heat exchange tubes (5).

6. The horizontal tubular air preheater with spoiler according to claim 1, characterized in that: The bottom of the frame (11) is provided with a manhole door (14) for checking, repairing and replacing the spoiler heat exchange tube (5).

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