Blast furnace oxygen-enriched combustion coupling CO2 capture device
By introducing components such as stirring rods, spray pipes, and brush plates into the blast furnace oxygen-enriched combustion coupled CO2 capture device, a closed-loop path is formed, which solves the problem of filter plate clogging, achieves efficient CO2 capture and device stability, and simplifies maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 吉林鑫达钢铁有限公司
- Filing Date
- 2025-07-28
- Publication Date
- 2026-08-04
AI Technical Summary
The existing CO2 capture device for blast furnaces lacks an effective filter plate cleaning function, which leads to filter plate clogging after prolonged use, increasing the workload and maintenance difficulty for staff.
A blast furnace oxygen-enriched combustion coupled CO2 capture device was designed, comprising a catalytic box, a collection cylinder, a mixing box, and multiple rotating components. Through the combined use of stirring rods, spray pipes, and brush plates, uniform stirring, spraying, and circulation of the absorbent are achieved, avoiding filter plate clogging and forming a closed-loop path of 'mixing-stirring-spraying-circulation' to ensure that the absorbent continuously and efficiently participates in CO2 capture.
It effectively avoids filter plate clogging, improves gas flow efficiency, ensures the stability of the device and the continuous and efficient participation of the absorbent, and simplifies the maintenance work for staff.
Smart Images
Figure CN224585545U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of CO2 capture technology, and in particular relates to a CO2 capture device coupled with oxygen-enriched combustion in a blast furnace. Background Technology
[0002] Oxygen-enriched combustion coupled with CO2 capture in blast furnaces is an innovative low-carbon smelting technology in the steel industry. Its core lies in increasing the oxygen concentration in the blast furnace blast during ironmaking (oxygen-enriched combustion) to enhance combustion efficiency and reduce nitrogen dilution, thereby improving the calorific value and reducing capacity of the blast furnace gas while lowering the coke ratio and fuel consumption. Based on this, the CO2 abundant in the blast furnace gas is efficiently separated and recovered using capture technologies such as chemical absorption, physical adsorption, or membrane separation, achieving carbon emission reduction. This technology couples process optimization with end-of-pipe treatment, improving blast furnace smelting energy efficiency and providing a feasible path for large-scale carbon reduction in the steel industry, making it a crucial direction for promoting the green and low-carbon transformation of steel processes.
[0003] For example, Chinese patent CN221999458U discloses a flue gas CO2 capture device, including a catalytic chamber, a water tank fixedly connected to the upper end of the catalytic chamber, a water pump fixedly connected to the upper end of the water tank, a first delivery pipe fixedly connected to one end of the water pump, a second delivery pipe fixedly connected to the end of the water pump away from the first delivery pipe, a spray ring fixedly connected to the end of the second delivery pipe away from the water pump, and multiple nozzles fixedly connected to the lower end of the spray ring, the multiple nozzles being evenly distributed around the axis of the spray ring. A filter plate is fixedly connected to the inner wall of the catalytic chamber, which can treat sulfur dioxide and nitrogen oxides contained in the flue gas. Impurity particles contained in the flue gas are filtered and collected by the filter screen. Carbon dioxide is transported into the collection cylinder by the gas guide pipe and the action of the fan, so that ethanolamine in the collection cylinder collects carbon dioxide. Ethanolamine containing carbon dioxide can be transported and purified, and ethanolamine can be recycled and reused, which can maximize the capture of carbon dioxide and reduce production costs.
[0004] The above-mentioned patent has the following problems: In actual use, it does not have the function of cleaning the filter plate, which causes the filter plate to be clogged by particulate matter after long-term use. It requires staff to clean it regularly, which is time-consuming and laborious, increases the workload of staff, and is inconvenient for staff to use. In view of this, we propose a blast furnace oxygen-enriched combustion coupled CO2 capture device. Utility Model Content
[0005] The purpose of this invention is to provide a blast furnace oxygen-enriched combustion coupled CO2 capture device to solve the problems mentioned in the background art.
[0006] In view of this, the present invention provides a blast furnace oxygen-enriched combustion coupled CO2 capture device, including a catalytic box, a collection cylinder and a mixing box. The collection cylinder is arranged on one side of the catalytic box. The catalytic box and the collection cylinder are connected by the same connecting pipe. A fan is arranged outside the connecting pipe. A filter plate is fixedly connected inside the catalytic box.
[0007] The motor is located at the top of the mixing chamber. The output end of the motor is fixedly connected to a first rotating shaft. The bottom of the first rotating shaft extends into the interior of the mixing chamber. Multiple equally spaced stirring rods are fixedly connected to the outside of the first rotating shaft. A second rotating shaft is rotatably connected to the top of the catalytic chamber.
[0008] A hollow rotating tube is rotatably mounted on the top of the catalytic converter. The bottom of the hollow rotating tube extends into the interior of the catalytic converter. A flow divider block is connected to the bottom of the hollow rotating tube. Spray pipes are connected to the four output ends of the flow divider block. Multiple equally spaced nozzles are connected to the outside of the four spray pipes. A third rotating shaft is fixedly connected to the bottom of the flow divider block. A brush plate is fixedly connected to the outside of the third rotating shaft. The brush plate is adapted to the filter plate.
[0009] A first rotating assembly is disposed outside the first rotating shaft and the second rotating shaft, and is used to drive the second rotating shaft to rotate;
[0010] The second rotating assembly is disposed outside the second rotating shaft and the hollow rotating tube, and is used to drive the hollow rotating tube to rotate.
[0011] In this technical solution, the gas after oxygen-enriched combustion in the blast furnace first flows through the filter plate in the catalytic box to initially filter out solid impurities. The motor is started, driving the first rotating shaft to rotate. The stirring rod on the first rotating shaft uniformly stirs the absorbent in the mixing box to ensure a consistent absorbent concentration. The hollow rotating tube is driven to rotate by the first and second rotating components. The diverting block at the bottom of the hollow rotating tube evenly sprays the absorbent in the mixing box into the catalytic box through the spray pipe and nozzle, ensuring full contact with the filtered blast furnace gas. CO2 in the gas is adsorbed and captured by the absorbent. The captured purified gas is pressurized and transported to the collection cylinder by the blower through the connecting pipe, completing the collection and temporary storage of CO2.
[0012] During the absorbent spraying process, the third rotating shaft drives the brush plate to rotate, and the brush plate contacts the surface of the filter plate in the catalytic chamber to avoid clogging of the filter plate and affecting the gas flow efficiency. The absorbent in the mixing chamber is drawn out by the water pump through the liquid outlet pipe and enters the diversion block through the inner ring of the bearing inside the hollow rotating tube. Through the above structure, the device can form a closed loop path of "mixing-stirring-spraying-circulation", ensuring that the absorbent continuously and efficiently participates in the CO2 capture process, ensuring the stability of the device operation, and thus facilitating the use of the staff.
[0013] In the above technical solution, a support frame is fixedly connected to the top of the mixing box, and the motor is fixedly connected to the support frame.
[0014] In this technical solution, the support frame ensures that the motor will not idle during operation.
[0015] In the above technical solution, the first rotating assembly further includes two synchronous pulleys, one of which is fixedly connected to the outside of the first rotating shaft, and the other synchronous pulley is fixedly connected to the top of the second rotating shaft. The two synchronous pulleys are externally meshed with the same synchronous belt.
[0016] In this technical solution, the first rotating shaft drives the second rotating shaft to rotate via a synchronous pulley and a synchronous belt.
[0017] In the above technical solution, the second rotating component further includes a driving gear, which is fixedly sleeved on the outside of the second rotating shaft, and a driven gear is fixedly sleeved on the outside of the hollow rotating tube, and the driving gear and the driven gear are meshed together.
[0018] In this technical solution, the driving gear and the driven gear outside the second rotating shaft mesh to drive the hollow rotating tube to rotate.
[0019] In the above technical solution, further, one side of the catalytic converter is connected to an air intake pipe, and an electromagnetic valve is provided on the outside of the air intake pipe.
[0020] In this technical solution, the gas produced by oxygen-enriched combustion in the blast furnace can be introduced into the catalytic converter through the intake pipe and solenoid valve.
[0021] In the above technical solution, a through groove is further provided on one side of the catalyst box, the through groove is located above the filter plate, and a sealing plate is hinged to the outside of the through groove.
[0022] In this technical solution, when it is necessary to replenish or repair the absorbent, the sealing plate outside the side channel of the catalytic converter can be opened, and new absorbent can be added into the catalytic converter through the channel. At the same time, impurities on the filter plate can also be cleaned.
[0023] In the above technical solution, further, a liquid outlet pipe is connected to one side of the mixing tank, and a water pump is installed outside the liquid outlet pipe.
[0024] In this technical solution, the absorbent in the mixing tank is extracted by a water pump through the liquid outlet pipe.
[0025] In the above technical solution, a bearing is further provided inside the hollow rotating tube, and the liquid outlet pipe is located on the inner ring of the bearing.
[0026] In this technical solution, the bearings are designed so that the hollow rotating tube will not cause the liquid outlet tube to rotate when it rotates.
[0027] The beneficial effects of this utility model are:
[0028] After oxygen-enriched combustion in the blast furnace, the gas first flows through the filter plate in the catalytic box to initially filter out solid impurities. The motor is then started, driving the first rotating shaft to rotate. The stirring rod on the first rotating shaft uniformly stirs the absorbent in the mixing box to ensure a consistent absorbent concentration. The first and second rotating components drive the hollow rotating tube to rotate. The diverting block at the bottom of the hollow rotating tube evenly sprays the absorbent in the mixing box into the catalytic box through the spray pipe and nozzle, ensuring full contact with the filtered blast furnace gas. CO2 in the gas is adsorbed and captured by the absorbent. The captured purified gas is then pressurized and transported to the collection cylinder by the blower through the connecting pipe, completing the collection and temporary storage of CO2.
[0029] During the absorbent spraying process, the third rotating shaft drives the brush plate to rotate, and the brush plate contacts the surface of the filter plate in the catalytic chamber to avoid clogging of the filter plate and affecting the gas flow efficiency. The absorbent in the mixing chamber is drawn out by the water pump through the liquid outlet pipe and enters the diversion block through the inner ring of the bearing inside the hollow rotating tube. Through the above structure, the device can form a closed loop path of "mixing-stirring-spraying-circulation", ensuring that the absorbent continuously and efficiently participates in the CO2 capture process, ensuring the stability of the device operation, and thus facilitating the use of the staff. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0031] Figure 2 This is a cross-sectional view of the overall structure of this utility model;
[0032] Figure 3 This is a partial cross-sectional view of the overall structure of this utility model;
[0033] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle.
[0034] The markings in the diagram are as follows:
[0035] 1. Catalytic converter; 2. Connecting pipe; 3. Collection cylinder; 4. Fan; 5. Inlet pipe; 6. Solenoid valve; 7. Filter plate; 8. Through groove; 9. Sealing plate; 10. Mixing box; 11. Support frame; 12. Motor; 13. First rotating shaft; 14. Stirring rod; 15. Second rotating shaft; 16. Synchronous pulley; 17. Synchronous belt; 18. Drive gear; 19. Hollow rotating tube; 20. Bearing; 21. Liquid outlet pipe; 22. Water pump; 23. Driven gear; 24. Diverter block; 25. Spray pipe; 26. Nozzle; 27. Third rotating shaft; 28. Brush plate. Detailed Implementation
[0036] The following is in conjunction with the appendix Figure 1 - Figure 4 This application will be described in further detail.
[0037] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0038] Example 1: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device, including a catalytic box 1, a collection cylinder 3 and a mixing box 10. The collection cylinder 3 is located on one side of the catalytic box 1. The catalytic box 1 and the collection cylinder 3 are connected by the same connecting pipe 2. A fan 4 is installed outside the connecting pipe 2. A filter plate 7 is fixedly connected inside the catalytic box 1.
[0039] Motor 12 is located on the top of mixing box 10. The output end of motor 12 is fixedly connected to a first rotating shaft 13. The bottom of the first rotating shaft 13 extends into the interior of mixing box 10. Multiple stirring rods 14 are fixedly connected to the outside of the first rotating shaft 13 at equal intervals. A second rotating shaft 15 is rotatably connected to the top of catalytic box 1.
[0040] A hollow rotating tube 19 is rotatably mounted on the top of the catalytic converter 1. The bottom of the hollow rotating tube 19 extends into the interior of the catalytic converter 1. A flow divider block 24 is connected to the bottom of the hollow rotating tube 19. Each of the four output ends of the flow divider block 24 is connected to a spray pipe 25. Multiple equally spaced nozzles 26 are connected to the outside of the four spray pipes 25. A third rotating shaft 27 is fixedly connected to the bottom of the flow divider block 24. A brush plate 28 is fixedly connected to the outside of the third rotating shaft 27. The brush plate 28 is compatible with the filter plate 7.
[0041] The first rotating assembly is disposed outside the first rotating shaft 13 and the second rotating shaft 15, and is used to drive the second rotating shaft 15 to rotate.
[0042] The second rotating assembly is disposed outside the second rotating shaft 15 and the hollow rotating tube 19, and is used to drive the hollow rotating tube 19 to rotate.
[0043] In this process, the gas from the oxygen-enriched combustion in the blast furnace first flows through the filter plate 7 in the catalytic box 1 to initially filter out solid impurities. The motor 12 is then started, driving the first rotating shaft 13 to rotate. The stirring rod 14 on the first rotating shaft 13 uniformly stirs the absorbent in the mixing box 10 to ensure a consistent absorbent concentration. The first and second rotating components drive the hollow rotating tube 19 to rotate. The diverting block 24 at the bottom of the hollow rotating tube 19 evenly sprays the absorbent in the mixing box 10 into the catalytic box 1 through the spray pipe 25 and the nozzle 26, ensuring full contact with the filtered blast furnace gas. The CO2 in the gas is adsorbed and captured by the absorbent. The captured purified gas is then pressurized and transported to the collection cylinder 3 by the blower 4 through the connecting pipe 2, completing the collection and temporary storage of CO2.
[0044] During the absorbent spraying process, the third rotating shaft 27 drives the brush plate 28 to rotate. The brush plate 28 contacts the surface of the filter plate 7 in the catalytic box 1, preventing the filter plate 7 from becoming clogged and affecting the gas flow efficiency. The absorbent in the mixing box 10 is drawn out by the water pump 22 through the liquid outlet pipe 21 and enters the diversion block 24 through the inner ring of the bearing 20 inside the hollow rotating tube 19. Through the above structure, the device can form a closed loop path of "mixing-stirring-spraying-circulation", ensuring that the absorbent continuously and efficiently participates in the CO2 capture process, ensuring the stability of the device operation, and thus facilitating the use by the staff.
[0045] Example 2: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: a support frame 11 is fixedly connected to the top of the mixing box 10, and a motor 12 is fixedly connected to the support frame 11.
[0046] The support frame 11 ensures that the motor 12 will not idle during operation.
[0047] Example 3: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: the first rotating component includes two synchronous pulleys 16, one of which is fixedly connected to the outside of the first rotating shaft 13, and the other synchronous pulley 16 is fixedly connected to the top of the second rotating shaft 15. The two synchronous pulleys 16 are externally meshed with the same synchronous belt 17.
[0048] The first rotating shaft 13 drives the second rotating shaft 15 to rotate via the synchronous pulley 16 and the synchronous belt 17.
[0049] Example 4: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: the second rotating component includes a drive gear 18, which is fixedly sleeved on the outside of the second rotating shaft 15. A driven gear 23 is fixedly sleeved on the outside of the hollow rotating tube 19. The drive gear 18 and the driven gear 23 are meshed and connected.
[0050] Among them, the driving gear 18 on the outside of the second rotating shaft 15 meshes with the driven gear 23, driving the hollow rotating tube 19 to rotate.
[0051] Example 5: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: one side of the catalytic box 1 is connected to an air inlet pipe 5, and an electromagnetic valve 6 is provided on the outside of the air inlet pipe 5.
[0052] The gas produced by oxygen-enriched combustion in the blast furnace can be introduced into the catalytic box 1 through the air inlet pipe 5 and the solenoid valve 6.
[0053] Example 6: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: a through groove 8 is provided on one side of the catalytic box 1. The through groove 8 is located above the filter plate 7. A sealing plate 9 is hinged to the outside of the through groove 8.
[0054] When it is necessary to replenish or repair the absorbent, the sealing plate 9 outside the side channel 8 of the catalytic box 1 can be opened, and new absorbent can be added into the catalytic box 1 through the channel 8. At the same time, impurities on the filter plate 7 can also be cleaned.
[0055] Example 7: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: a liquid outlet pipe 21 is connected to one side of the mixing tank 10, and a water pump 22 is installed outside the liquid outlet pipe 21.
[0056] The absorbent in the mixing tank 10 is extracted by the water pump 22 through the liquid outlet pipe 21.
[0057] Example 8: This example provides a blast furnace oxygen-enriched combustion coupled CO2 capture device. In addition to the technical solutions of the above examples, it also has the following technical features: a bearing 20 is provided inside the hollow rotating tube 19, and the liquid outlet pipe 21 is provided on the inner ring of the bearing 20.
[0058] The bearing 20 ensures that the hollow rotating tube 19 will not rotate, thus preventing the outlet tube 21 from rotating.
[0059] Working principle: The gas after oxygen-enriched combustion in the blast furnace first enters the device through the inlet pipe 5 on the side of the catalytic box 1. The gas first flows through the filter plate 7 in the catalytic box 1 to initially filter out solid impurities. The motor 12 at the top of the mixing box 10 is started, and its output drives the first rotating shaft 13 to rotate. The stirring rod 14 on the first rotating shaft 13 stirs the absorbent in the mixing box 10 evenly to ensure that the absorbent concentration is consistent. At the same time, the first rotating shaft 13 drives the second rotating shaft 15 to rotate through the synchronous wheel 16 and the synchronous belt 17. The driving gear 18 and the driven gear 23 on the outside of the second rotating shaft 15 mesh to drive the hollow rotating tube 19 to rotate. The diverting block 24 at the bottom of the hollow rotating tube 19 sprays the absorbent in the mixing box 10 evenly into the catalytic box 1 through the spray pipe 25 and the nozzle 26, so that it can fully contact the filtered blast furnace gas. The CO2 in the gas is adsorbed and captured by the absorbent. The captured purified gas is pressurized and transported to the collection cylinder 3 by the blower 4 through the connecting pipe 2 to complete the collection and temporary storage of CO2.
[0060] During the absorbent spraying process, the third rotating shaft 27 at the bottom of the hollow rotating tube 19 drives the brush plate 28 to rotate synchronously. The brush plate 28 contacts the surface of the filter plate 7 in the catalytic box 1, and cleans the impurities such as dust and reaction by-products attached to the surface of the filter plate 7 by rotating and scraping, so as to avoid the filter plate 7 from being blocked and affecting the gas flow efficiency. When it is necessary to replenish or repair the absorbent, the sealing plate 9 outside the side channel 8 of the catalytic box 1 can be opened, and new absorbent can be added into the catalytic box 1 through the channel 8. At the same time, the impurities on the filter plate 7 can also be cleaned. The absorbent in the mixing box 10 is drawn out by the water pump 22 through the liquid outlet pipe 21 and enters the diversion block 24 through the inner ring of the bearing 20 inside the hollow rotating tube 19. Through the above structure, the device can form a closed loop path of "mixing-stirring-spraying-circulation", ensuring that the absorbent continuously and efficiently participates in the CO2 capture process, ensuring the stability of the device operation, and thus facilitating the use of the staff.
[0061] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A blast furnace oxygen-enriched combustion coupled CO2 capture device, comprising a catalytic box (1), a collection cylinder (3), and a mixing box (10), characterized in that: The collecting cylinder (3) is located on one side of the catalytic box (1). The catalytic box (1) and the collecting cylinder (3) are connected by the same connecting pipe (2). A fan (4) is installed outside the connecting pipe (2). A filter plate (7) is fixedly connected inside the catalytic box (1). The motor (12) is located at the top of the mixing tank (10). The output end of the motor (12) is fixedly connected to a first rotating shaft (13). The bottom of the first rotating shaft (13) extends into the interior of the mixing tank (10). Multiple stirring rods (14) are fixedly connected to the outside of the first rotating shaft (13). The top of the catalyst tank (1) is rotatably connected to a second rotating shaft (15). A hollow rotating tube (19) is rotatably mounted on the top of the catalytic converter (1). The bottom of the hollow rotating tube (19) extends into the interior of the catalytic converter (1). A flow divider block (24) is connected to the bottom of the hollow rotating tube (19). Spray pipes (25) are connected to the four output ends of the flow divider block (24). Multiple equally spaced nozzles (26) are connected to the outside of the four spray pipes (25). A third rotating shaft (27) is fixedly connected to the bottom of the flow divider block (24). A brush plate (28) is fixedly connected to the outside of the third rotating shaft (27). The brush plate (28) is adapted to the filter plate (7). The first rotating assembly is disposed outside the first rotating shaft (13) and the second rotating shaft (15) and is used to drive the second rotating shaft (15) to rotate; The second rotating assembly is disposed outside the second rotating shaft (15) and the hollow rotating tube (19) and is used to drive the hollow rotating tube (19) to rotate.
2. The apparatus according to claim 1, wherein, The top of the mixing box (10) is fixedly connected to a support frame (11), and the motor (12) is fixedly connected to the support frame (11).
3. The blast furnace oxygen-enriched combustion coupled CO2 capture device according to claim 1, characterized in that, The first rotating assembly includes two synchronous pulleys (16), one of which is fixedly connected to the outside of the first rotating shaft (13), and the other is fixedly connected to the top of the second rotating shaft (15). The two synchronous pulleys (16) are meshed with the same synchronous belt (17).
4. The apparatus according to claim 1, wherein the oxygen-enriched air is supplied to the blast furnace at a temperature of 100- 300°C. The second rotating assembly includes a drive gear (18), which is fixedly sleeved on the outside of the second rotating shaft (15). A driven gear (23) is fixedly sleeved on the outside of the hollow rotating tube (19). The drive gear (18) and the driven gear (23) are meshed together.
5. The blast furnace oxygen-enriched combustion coupled CO2 capture device according to claim 1, characterized in that, One side of the catalytic converter (1) is connected to an air intake pipe (5), and an electromagnetic valve (6) is provided on the outside of the air intake pipe (5).
6. The blast furnace oxygen-enriched combustion coupled CO2 capture device according to claim 1, characterized in that, A through groove (8) is provided on one side of the catalyst box (1). The through groove (8) is located above the filter plate (7). A sealing plate (9) is hinged to the outside of the through groove (8).
7. A blast furnace oxygen-enriched combustion coupled CO2 capture device according to claim 1, characterized in that, One side of the mixing tank (10) is connected to a liquid outlet pipe (21), and a water pump (22) is installed outside the liquid outlet pipe (21).
8. A blast furnace oxygen-enriched combustion coupled CO2 capture device according to claim 7, characterized in that, The hollow rotating tube (19) is equipped with a bearing (20) inside, and the liquid outlet tube (21) is located on the inner ring of the bearing (20).