A kiln tail boiler heat exchange pipe cleaning mechanism

Abstract

The utility model relates to a kind of kiln tail boiler heat exchange pipe cleaning mechanism, including the heat exchange straight pipe of being threaded in furnace body, rotatingly arranged screw rod in heat exchange straight pipe, screw rod extends along the axial direction of heat exchange straight pipe, sliding block is sleeved on screw rod, annular movable plate that also is equipped with the sliding of along the axial direction in heat exchange straight pipe, movable plate is sleeved on screw rod and is fixedly connected with sliding block by first connecting rod, annular scraping brush is fixedly connected on the outer wall of movable plate, the circumferential outer wall of scraping brush is in contact with the inner wall of heat exchange straight pipe, driving mechanism is equipped on heat exchange straight pipe and drives screw rod rotation;Two slag discharge ports are opened on the bottom outer wall of heat exchange straight pipe, two slag discharge ports are located at the outside of furnace body and are respectively located at the two sides of furnace body.The utility model scrapes and cleans scale impurity on the inner wall of heat exchange straight pipe by scraping brush, and the impurity cleaned falls into slag discharge port under the pushing of scraping brush, and can discharge impurity by opening sealing cover, without disassembling pipeline, more convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of kiln tail boiler pipe cleaning technology, specifically to a kiln tail boiler heat exchange tube cleaning mechanism. Background Technology

[0002] The cement production process generates a large amount of flue gas. Currently, the cement industry typically introduces the flue gas containing waste heat into a kiln tail boiler. The kiln tail boiler is equipped with heat exchange tubes, one end of which is connected to a cold water pipeline and the other end to a hot water pipeline. Cold water is introduced into the heat exchange tubes through the cold water pipeline, and the waste heat of the flue gas is used to heat the cold water to generate steam for power generation. At the same time, it can also cool down the flue gas. The hot water after heat exchange is discharged from the hot water pipeline, realizing the utilization of waste heat energy from the flue gas.

[0003] However, after prolonged use, scale often forms on the inner wall of the heat exchange tube, significantly affecting heat exchange efficiency. Patent CN221472894U provides a kiln tail boiler pipe that fixes a first boiler pipe and a second boiler pipe together with a pipe sleeve. Turning on the machine switch causes a rotary motor to drive a rotating rod and gear to rotate. Through the meshing of the gear and gear ring, the gear ring rotates between the first and second boiler pipes, driving an internal cleaning brush to clean the dirt on the inner wall to the bottom of the pipe.

[0004] However, since this patent does not have an impurity outlet, the ends of the first and second boiler pipes must be disconnected from other cold or hot water pipes before the cleaned impurities can be discharged. This is laborious to install and remove, and inconvenient to use. Furthermore, the cylinder 111 in this patent is located at the end of the second boiler pipe, making it inconvenient to connect with other pipes during installation, and further improvements are still needed. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a kiln tail boiler heat exchange tube cleaning mechanism that can clean impurities on the inner wall of the pipes without disassembling them, making it more convenient to use.

[0006] This utility model is achieved through the following technical solution: a heat exchange tube cleaning mechanism for a kiln tail boiler, comprising a heat exchange straight tube passing through the furnace body, a lead screw rotatably installed inside the heat exchange straight tube, the lead screw extending axially along the heat exchange straight tube, a slider sleeved on the lead screw, the slider being threadedly connected to the lead screw, an annular movable plate sliding axially inside the heat exchange straight tube, the movable plate being sleeved on the lead screw and fixedly connected to the slider through a first connecting rod, an annular scraping brush fixedly connected to the outer wall of the movable plate, the circumferential outer wall of the scraping brush contacting the inner wall of the heat exchange straight tube, a driving mechanism for driving the lead screw to rotate on the heat exchange straight tube; two slag discharge ports are opened on the bottom outer wall of the heat exchange straight tube, the two slag discharge ports are located outside the furnace body and respectively on both sides of the furnace body, and sealing caps are fixedly connected to the slag discharge ports by bolts.

[0007] This solution uses a drive mechanism to rotate a lead screw, causing a slider screwed onto the lead screw to move axially along the lead screw. This, in turn, moves a movable plate axially along the heat exchange straight tube, allowing a scraping brush to scrape and clean scale and impurities from the inner wall of the heat exchange straight tube. The cleaned impurities fall into the slag discharge port under the push of the scraping brush. The impurities can be discharged by opening the sealing cover. There is no need to disassemble the pipeline, making it more convenient to use.

[0008] As an optimization, an inspection port is provided on the top outer wall of the heat exchange straight tube outside the furnace body, and a sealing cap is fixed to the inspection port with bolts. This optimized solution allows for convenient inspection and maintenance of the internal cleaning mechanism through the inspection port.

[0009] As an optimization, the drive mechanism includes a driven bevel gear fixed to one end of the lead screw and a transmission rod perpendicular to the lead screw. One end of the transmission rod is fixedly connected to a driving bevel gear that meshes with the driven bevel gear. The other end of the transmission rod extends to the outside of the heat exchange straight tube and is fixedly connected to a handwheel. The transmission rod is rotatably and sealed to the heat exchange straight tube. In this optimized solution, rotating the transmission rod via the handwheel causes the driving bevel gear to drive the driven bevel gear, which in turn drives the lead screw. Because the transmission rod and lead screw are vertically aligned, the transmission rod can pass through the outer wall of the heat exchange straight tube without affecting the connection between the end of the heat exchange straight tube and other pipelines, facilitating installation.

[0010] As an optimization, bearings are rotatably connected to both ends of the lead screw. The outer wall of the bearing is fixed to the heat exchange straight tube via a second connecting rod. The second connecting rod and the first connecting rod are parallel and opposite to each other. A guide rod is fixed between the two second connecting rods and passes through the first connecting rod. In this optimized scheme, the lead screw achieves a rotatable connection with the heat exchange straight tube through the bearings at both ends. By setting a guide rod between the two second connecting rods, the movable plate is guided, allowing the movable plate to slide along the axial direction of the heat exchange straight tube.

[0011] As an optimization, on / off valves are fixedly connected to both ends of the heat exchange straight tube. This optimized solution uses on / off valves at both ends of the heat exchange straight tube to block the medium flow, facilitating the cleaning of impurities.

[0012] The beneficial effects of this invention are as follows: A scraping brush sliding axially along the heat exchanger tube scrapes and cleans scale and impurities from the inner wall of the tube. The cleaned impurities fall into the discharge port under the push of the scraping brush, and can be discharged by opening the sealing cap. No disassembly of the pipeline is required, making it more convenient to use. Furthermore, on / off valves are installed at both ends of the heat exchanger tube to easily block the medium, creating a cavity inside the tube for easy cleaning of impurities. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 This is a front view of the present utility model;

[0015] Figure 3 This is an internal side view of the heat exchange straight tube;

[0016] Figure 4 for Figure 1 Enlarged view of part A;

[0017] Figure 5 for Figure 1 Enlarged view of part B;

[0018] As shown in the figure:

[0019] 1. Furnace body, 2. Heat exchange straight tube, 3. External water outlet pipe, 4. External water inlet pipe, 5. Lead screw, 6. Slider, 7. Movable plate, 8. Scraper brush, 9. First connecting rod, 10. Bearing, 11. Driven bevel gear, 12. Driven bevel gear, 13. Transmission rod, 14. Handwheel, 15. Guide rod, 16. Slag discharge port, 17. Inspection port, 18. Sealing cover, 19. Switch valve, 20. Second connecting rod. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0021] like Figures 1-5 As shown, a kiln tail boiler heat exchange tube cleaning mechanism includes a heat exchange straight tube 2 that passes through the furnace body 1, with both ends of the heat exchange straight tube 2 extending through both sides of the furnace body 1 to the outside of the furnace body.

[0022] In this embodiment, two switch valves 19 are fixedly connected to both ends of the heat exchange straight tube 2. The two switch valves 19 are respectively connected to the external water inlet pipe 4 and the external water outlet pipe 3. The two switch valves 19 facilitate the control of the medium input, so that the inner cavity of the heat exchange straight tube 2 is formed, which facilitates cleaning operations.

[0023] A lead screw 5 is rotatably installed inside the heat exchange straight tube 2, extending axially along the heat exchange straight tube 2. A slider 6 is sleeved on the lead screw 5, and the slider 6 is threadedly connected to the lead screw 5. An annular movable plate 7 that slides axially is also provided inside the heat exchange straight tube 2. The movable plate 7 is sleeved on the lead screw 5 and fixedly connected to the slider 6 through a first connecting rod 9. An annular scraping brush 8 is fixedly connected to the outer wall of the movable plate 7, and the circumferential outer wall of the scraping brush 8 contacts the inner wall of the heat exchange straight tube 2.

[0024] Specifically, the lead screw 5 and the heat exchange straight tube 2 are coaxially arranged, and bearings 10 are rotatably connected to both ends of the lead screw 5. The outer wall of the bearing 10 is fixed to the heat exchange straight tube 2 through the second connecting rod 20. In this embodiment, the bearing 10 is fixed to the heat exchange straight tube 2 through two second connecting rods 20 distributed vertically, which results in higher structural strength and stability.

[0025] The inner diameter of the movable plate 7 is larger than the outer diameter of the slider 6, forming an annular channel between the movable plate 7 and the slider 6 for the medium to pass through. The movable plate 7 and the lead screw 5 are coaxially arranged, and the slider 6 is fixed to the inner wall of the movable plate 7 by two vertically distributed first connecting rods 9, making the structure more stable.

[0026] The second connecting rod 20 and the first connecting rod 9 are parallel and opposite to each other. A guide rod 15 is fixed between the two opposing second connecting rods 20, and the guide rod 15 passes through the opposing first connecting rod 9. The lead screw 5 is rotatably connected to the heat exchange straight tube 2 through bearings 10 at both ends. By setting the guide rod 15 between the two second connecting rods 20, the movement of the movable plate 7 is guided, allowing the movable plate to slide axially along the heat exchange straight tube 2.

[0027] The heat exchange straight tube 2 is equipped with a drive mechanism that drives the lead screw 5 to rotate.

[0028] Specifically, the drive mechanism includes a driven bevel gear 11 fixed to one end of the lead screw 5 and a transmission rod 13 perpendicular to the lead screw 5. One end of the transmission rod 13 is fixedly connected to a driving bevel gear 12 that meshes with the driven bevel gear 11. The other end of the transmission rod 13 extends to the outside of the heat exchange straight tube 2 and is fixedly connected to a handwheel 14. The transmission rod 13 is rotatably connected to the heat exchange straight tube 2 in a sealed manner.

[0029] In this embodiment, the two ends of the lead screw 5 extend to the outer sides of the furnace body 1, respectively. The transmission rod 13 is vertically inserted into the heat exchange straight tube 2, and the outer wall of the transmission rod 13 and the heat exchange straight tube 2 are connected by a sealed bushing to prevent media leakage. By rotating the transmission rod 13 with the handwheel 14, the driving bevel gear 12 drives the driven bevel gear 11 to rotate, thereby driving the lead screw 5 to rotate. Since the transmission rod 13 and the lead screw 5 are vertically arranged, the transmission rod 13 passes through the heat exchange straight tube 2 perpendicularly, which does not affect the connection of the end of the heat exchange straight tube 2 to other pipelines, facilitating installation.

[0030] In this embodiment, a handwheel 14 is used to rotate the transmission rod 13, which is a manual driving method. Obviously, a servo motor can also be used to achieve automated driving of the rotation of the transmission rod 13, which is something that those skilled in the art can conceive of.

[0031] Two slag discharge ports 16 are provided on the bottom outer wall of the heat exchange straight tube 2. The two slag discharge ports 16 are located outside the furnace body 1 and on both sides of the furnace body 1, respectively. Sealing caps 18 are fixed to the slag discharge ports 16 by bolts. The length of the lead screw 5 is greater than the distance between the two slag discharge ports 16. When the movable plate 7 moves axially, it passes through the two slag discharge ports 16, thereby pushing impurities into the slag discharge ports 16.

[0032] Preferably, the heat exchange straight tube 2 has an inspection port 17 on its top outer wall outside the furnace body, and a sealing cover 18 is also fixed to the inspection port 17 by bolts. In this embodiment, the inspection port 17 is located at the end of the heat exchange straight tube 2 where the drive mechanism is located, which facilitates observation of the position of the movable plate while driving the lead screw to rotate, making it convenient for personnel to operate. The internal cleaning mechanism can be inspected and maintained through the inspection port, which is convenient to use.

[0033] Working Principle: Personnel periodically clean impurities from the inner wall of the heat exchange straight tube 2 using a cleaning mechanism. During cleaning, firstly, both switch valves 19 are closed to prevent the medium from entering the heat exchange straight tube 2. Then, the sealing caps 18 of the two slag discharge ports 16 are opened to discharge any remaining medium from the heat exchange straight tube 2, creating a cavity inside. The handwheel 14 drives the transmission rod 13 to rotate, which in turn drives the lead screw 5 to rotate, thereby driving the movable plate 7 to slide axially. During this sliding process, the scraping brush 8 on the outer wall of the movable plate 7 scrapes and cleans the inner wall of the heat exchange straight tube 2, pushing the cleaned impurities into the slag discharge ports 16 for discharge. By reversing the handwheel 14, the lead screw 5 rotates in both directions, causing the movable plate 7 to slide back and forth within the heat exchange straight tube 2. Multiple scraping operations ensure the inner wall of the heat exchange straight tube 2 is thoroughly cleaned. Finally, the slag discharge ports 16 are resealed, and the switch valves 19 are opened for continued use. The entire process does not require disassembly of the pipeline, making it more convenient to use.

[0034] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A heat exchange tube cleaning mechanism for a kiln tail boiler, comprising a heat exchange straight tube (2) passing through the furnace body (1), characterized in that: A lead screw (5) is rotatably installed inside the heat exchange straight tube (2). The lead screw extends along the axial direction of the heat exchange straight tube (2). A slider (6) is sleeved on the lead screw (5). The slider is threadedly connected to the lead screw. An annular movable plate (7) that slides along the axial direction is also provided inside the heat exchange straight tube (2). The movable plate (7) is sleeved on the lead screw (5) and fixed to the slider (6) through the first connecting rod (9). An annular scraping brush (8) is fixed on the outer wall of the movable plate (7). The circumferential outer wall of the scraping brush contacts the inner wall of the heat exchange straight tube (2). A driving mechanism for driving the lead screw (5) to rotate is provided on the heat exchange straight tube (2). Two slag discharge ports (16) are opened on the bottom outer wall of the heat exchange straight tube (2). The two slag discharge ports are located outside the furnace body (1) and on both sides of the furnace body (1). A sealing cap (18) is fixed to the slag discharge port by bolts.

2. The kiln tail boiler heat exchanger tube cleaning mechanism according to claim 1, characterized in that: The heat exchange straight tube (2) is located on the top outer wall of the furnace body and has an inspection port (17). A sealing cap (18) is fixed to the inspection port by bolts.

3. The kiln tail boiler heat exchanger tube cleaning mechanism according to claim 1, characterized in that: The drive mechanism includes a driven bevel gear (11) fixed to one end of the lead screw (5) and a transmission rod (13) perpendicular to the lead screw (5). One end of the transmission rod (13) is fixed with a driving bevel gear (12) that meshes with the driven bevel gear (11). The other end of the transmission rod (13) extends to the outside of the heat exchange straight tube (2) and is fixed with a handwheel (14). The transmission rod is rotatably connected to the heat exchange straight tube.

4. The kiln tail boiler heat exchanger tube cleaning mechanism according to claim 1, characterized in that: Both ends of the lead screw (5) are rotatably connected to bearings (10). The outer wall of the bearing (10) is fixed to the heat exchange straight pipe (2) through the second connecting rod (20). The second connecting rod (20) and the first connecting rod (9) are parallel to each other. A guide rod (15) is fixed between the two second connecting rods (20). The guide rod passes through the first connecting rod (9).

5. The kiln tail boiler heat exchanger tube cleaning mechanism according to claim 1, characterized in that: Switch valves (19) are fixed at both ends of the heat exchange straight pipe (2).

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