A dry cooling system for molten blast furnace slag

Abstract

The application discloses a dry cooling system for blast furnace molten slag, which comprises a dry cooling tower and a slag turning intermediate barrel, a barrel cover movably arranged above the slag turning intermediate barrel, a closing mechanism drivingly connected with the barrel cover arranged above the dry cooling tower, a transition cooling cone arranged at the top of the dry cooling tower, a first-stage flow guide cone nozzle arranged at the bottom of the slag turning intermediate barrel, a spraying mechanism arranged on the upper portion of the transition cooling cone, a second-stage flow guide cone nozzle arranged at the bottom of the transition cooling cone, an air injection mechanism arranged on the lower portion of the second-stage flow guide cone nozzle, a fluidized air distribution mechanism arranged at the lower portion of the dry cooling tower, a slag falling pipe arranged on the fluidized air distribution mechanism, an exhaust pipe arranged at the upper portion of the dry cooling tower, a centrifugal separator arranged on the exhaust pipe, a slag discharging pipe arranged at the bottom of the dry cooling tower and the centrifugal separator, and a water cooling wall assembly arranged on the outer wall of the dry cooling tower. The system can effectively improve the cooling effect of the molten slag, ensure the production efficiency and reduce the gas consumption in the cooling process.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking production technology, specifically relating to a dry cooling system for molten blast furnace slag. Background Technology

[0002] Blast furnace slag is a waste product discharged from the blast furnace during pig iron smelting. When the furnace temperature reaches 1450–1650℃, the furnace charge melts, and gangue from the ore, ash from the coke, flux, and other impurities that cannot enter the pig iron form slag, mainly composed of silicates and aluminates, which floats on the molten iron. Its main components are CaO, SiO2, and Al2O3, with small amounts of MgO, MnO, FeO, and S. Blast furnace slag is a waste product of ironmaking; approximately 0.29 tons of blast furnace slag are produced per ton of pig iron. At a tapping temperature of 1450–1650℃, the sensible heat and heat of solution of molten blast furnace slag reach 1883.6 MJ / t. Based on my country's annual pig iron production of 600 million tons, 174 million tons of blast furnace slag are produced annually, with waste heat equivalent to 11.14 million tons of standard coal. Whether measured by unit heat or total volume, blast furnace slag is a high-grade waste heat resource. Its efficient recovery and utilization is an important way for the steel industry to save energy, reduce emissions, and improve the efficiency of secondary energy. Currently, the vast majority of methods for treating high-melting-point blast furnace slag in China are wet cooling and dry cooling. Wet cooling involves flushing molten blast furnace slag with water, granulating it into slag, which is then processed and used as a building material. The flushing water is then recycled after sedimentation, filtration, and cooling. However, because water quenching converts the high-grade sensible heat of the blast furnace slag into low-grade waste heat in the flushing water, the waste heat recovery technology for this method suffers from low recovery rates, low energy grade, and limited applications, making it difficult to solve. Furthermore, it generates a large amount of polluting waste gas during the cooling process. Dry cooling, on the other hand, utilizes indirect or direct contact between high-temperature blast furnace slag and a heat transfer medium for slag granulation and sensible heat recovery. This method does not consume valuable water resources and releases almost no harmful gases such as H2S and SO2. In existing technologies, the dry treatment of molten blast furnace slag commonly uses air-quenching granulation, which involves a high-speed air stream impacting, dividing, and granulating the liquid steel slag, followed by air cooling to obtain granules with a diameter of 2m. For solid spherical slag particles of approximately 1 μm, the dry cooling system is a key piece of equipment in air-quenched granulation. Existing dry cooling systems utilize a spray gun to inject molten slag into the granulator, then spray compressed air into the granulator to cool the slag. This dry cooling system has several shortcomings: First, the existing compressed air injection mechanism relies on only one or two nozzles spraying from below the molten slag spray gun. This results in uneven airflow around the molten slag, leading to uneven airflow at the spray gun outlet. This uneven airflow causes poor contact between the compressed air and the molten slag, resulting in poor molten slag spray cooling. Simultaneously, the uneven airflow creates uneven suction on the dripping molten slag, causing molten slag to clog the nozzles, interrupting the spray cooling of the molten slag and affecting production efficiency. Second, relying solely on nozzle spray cooling cannot achieve a good cooling effect. After cooling, a large amount of molten slag still adheres, easily causing equipment blockage and excessive air consumption. Therefore, it is an objective need to develop a dry cooling system for blast furnace molten slag that is structurally sound, consumes little gas, has a significant cooling effect, and operates stably and efficiently. Summary of the Invention

[0003] In order to solve the technical problems of poor cooling effect and excessive gas consumption in the background technology, the purpose of this invention is to provide a dry cooling system for blast furnace molten slag that has a reasonable structure, low gas consumption, significant cooling effect, and stable and efficient operation.

[0004] The dry cooling system for blast furnace molten slag of the present invention includes a dry cooling tower and a slag transfer intermediate tank located at the top of the dry cooling tower. A tank cover is movably installed above the slag transfer intermediate tank. A closing mechanism connected to the tank cover is installed above the dry cooling tower. A transition cooling cone is installed at the top of the dry cooling tower. A primary guide cone nozzle extending to the transition cooling cone is installed at the bottom of the slag transfer intermediate tank. A spray mechanism is installed on the upper part of the transition cooling cone. A secondary guide cone nozzle is installed at the bottom of the transition cooling cone. An air jet mechanism is installed on the lower outer side of the secondary guide cone nozzle. A fluidizing air distribution mechanism is installed at the lower part of the dry cooling tower. A slag discharge pipe is installed on the fluidizing air distribution mechanism. An exhaust pipe is installed inclined upward at the upper part of the dry cooling tower. A filter screen is installed at the inlet of the exhaust pipe. A centrifugal separator is installed on the exhaust pipe. A slag discharge pipe is installed at the bottom of the dry cooling tower and the centrifugal separator. A water-cooled wall assembly is installed on the outer wall of the dry cooling tower.

[0005] Furthermore, the closing mechanism includes a support frame, a movable rotating shaft, a lifting cylinder, and a drive motor. The support frame is installed on the top of the dry cooling tower, the lifting cylinder is installed on the support frame, the lower end of the movable rotating shaft is rotatably installed on the lifting cylinder, a horizontal connecting rod is installed on the barrel cover, the horizontal connecting rod is fixedly installed on the movable rotating shaft, a driving bevel gear is installed on the upper part of the movable rotating shaft on the upper side of the horizontal connecting rod, the drive motor is installed on the top of the support frame on one side of the movable rotating shaft, and a driven bevel gear that cooperates with the driving bevel gear is installed on the output shaft of the drive motor. Preferably, a stirring rod is rotatably installed on the barrel cover, a spiral stirring blade is installed on the stirring rod, and a stirring motor that is drively connected to the stirring rod is installed on the top of the barrel cover.

[0006] Furthermore, the spraying mechanism includes a water supply pipe and an annular pipe. A flow control valve is installed on the water supply pipe, and the annular pipe is installed on the outside of the transition cooling cone. The water inlet pipe is connected to the annular pipe, and multiple atomizing nozzles extending into the transition cooling cone are installed on the annular pipe.

[0007] Furthermore, the jet mechanism includes a jet base, a first air distribution box, and an air intake pipe. The jet base is fixedly installed on the outside of the secondary guide nozzle by a support rod. Multiple air intake channels are evenly distributed inside the jet base. An airflow distribution ring is provided in the air intake channel. An air nozzle is detachably installed at the outlet of the air intake channel. The cross-sectional shape of the air nozzle is a downwardly bent structure, and the inner diameter of the air nozzle gradually decreases along the airflow direction. The first air distribution box is located above the jet base. The air intake pipe is connected to the first air distribution box. An air compressor and an air storage tank are sequentially arranged on the air intake pipe. Multiple air guide pipes connected to the air intake channels are evenly distributed at the bottom of the first air distribution box. Preferably, the airflow distribution ring includes a first positioning ring and a second positioning ring arranged coaxially. The first positioning ring and the second positioning ring are rotatably installed in the air intake channel. Multiple flow divider blades are evenly distributed between the first positioning ring and the second positioning ring, and the two ends of the multiple flow divider blades are respectively fixedly connected to the first positioning ring and the second positioning ring one by one.

[0008] Furthermore, the fluidized bed distribution mechanism includes a second air inlet box, a cold air delivery pipe, and a fluidized bed base. The second air inlet box is fixedly installed on the inner wall of the dry cooling tower. The cold air delivery pipe is connected to the second air inlet box. A cold air blower and a gas buffer tank are installed on the cold air delivery pipe. A refrigerator is installed inside the gas buffer tank. The fluidized bed base is installed on the inner wall of the dry cooling tower above the second air inlet box. A conical groove with a larger upper end and a smaller lower end is machined on the upper surface of the fluidized bed base. A slag discharge pipe is installed at the bottom of the conical groove, and the lower end of the slag discharge pipe passes through the second air inlet box. Multiple distribution air holes are evenly distributed on the upper surface of the second air inlet box. Multiple air distribution pipes corresponding to the distribution air holes are installed through the fluidized bed base. The lower end of the air distribution pipe is connected to the distribution air hole through a short pipe. An air cap is installed on the upper end of the air distribution pipe. The air cap is a hemispherical or conical structure.

[0009] Furthermore, the water-cooled wall assembly includes a water-cooled jacket spaced apart on the outside of the dry cooling tower. The cavity between the water-cooled jacket and the dry cooling tower is a water-cooled cavity. Multiple horizontal baffles are spaced apart from top to bottom inside the water-cooled cavity. The water-cooled cavity is divided into multiple cold water distribution chambers by the multiple horizontal baffles. A water inlet branch pipe is provided on the upper part of one side of each cold water distribution chamber, and a water outlet branch pipe is provided on the lower part of the other side of each cold water distribution chamber. The water inlet branch pipe is connected to the main water inlet pipe, and a water pump is installed on the main water inlet pipe. The water outlet branch pipe is connected to the main water outlet pipe.

[0010] By improving the system structure, this invention has the following advantages:

[0011] Firstly, this device transfers molten slag through an intermediate slag bucket and then discharges it through a primary guide cone nozzle. As the flow area within the primary guide cone nozzle gradually decreases, the flow velocity slows down. Atomizing mechanisms spray cold water into the transition cooling cone. This sprayed water first cools the molten slag, reducing its temperature. The cooled molten slag then converges at the secondary guide cone nozzle and flows out through it. Here, the flow velocity and flow area again decrease, flattening the clumps of molten slag as it flows out. Finally, a jet spray mechanism sprays water around the molten slag. After compressed air is injected, it can provide 360° surround cooling of the molten slag. The compressed air and molten slag make full and uniform contact in the upper part of the dry cooling tower, so that the molten slag is cooled and broken into fine powder particles. This solves the problem that uneven airflow will cause uneven suction on the dripping molten slag, which will cause slag to clog the nozzle. It can ensure that the flow rate and velocity of compressed air entering the dry cooling tower are uniform, reduce the collision between powder particles after the molten metal is cooled and broken, reduce the phenomenon of powder particles sticking together, prevent the dry cooling tower from clogging, facilitate continuous cooling of molten slag, ensure the efficient and stable operation of the system, and reduce the amount of compressed air used.

[0012] Secondly, the fluidized bed air distribution mechanism can continuously and evenly deliver cold air to the lower part of the dry cooling tower in a uniform and quantitative manner. The cold air can keep the powder particles in a suspended state in the dry cooling tower. Since the temperature of the cold air is lower than that of the powder particles, the cold air can quickly absorb the temperature of the powder particles, allowing the powder particles to be cooled quickly. After secondary cooling, the powder particles are discharged from the dry cooling tower through the slag discharge pipe. The fluidized bed air distribution mechanism can make the contact area between the cold air and the powder particles larger and more uniform, which can achieve a better cooling effect.

[0013] Third, the addition of a lid and closing mechanism allows for the opening and closing of the intermediate slag bucket, preventing high-speed airflow from directly spraying onto the surface of the molten slag during the slag cooling process, thus avoiding molten slag splashing, material waste, and ensuring safety during use.

[0014] Fourth, the water-cooled wall components can absorb the heat generated during the cooling process inside the dry cooling tower, reduce the cooling temperature inside the dry cooling tower, and realize the recovery of heat energy.

[0015] In summary, this device employs a cooling method that combines jet cooling and fluidized bed air supply cooling, which not only effectively improves the cooling effect of molten slag but also ensures production efficiency and reduces air consumption during the cooling process. It has the advantages of reasonable structure, stable operation, and low operating cost, and is easy to promote and use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram showing the positions of the secondary guide cone nozzle 5 and the jet mechanism in this invention;

[0018] Figure 3 This is a schematic diagram of the airflow distribution ring 55 in this invention;

[0019] In the diagram: 1-Dry cooling tower, 2-Intermediate slag drum, 21-Drum lid, 22-Support frame, 23-Modible rotating shaft, 24-Lifting cylinder, 25-Drive motor, 26-Horizontal connecting rod, 27-Driven bevel gear, 28-Driving bevel gear, 29-Stirring rod, 210-Helical stirring blade, 211-Stirring motor, 3-Transition cooling cone, 31-Water inlet pipe, 32-Annular pipe, 33-Atomizing nozzle, 4-First-stage guide cone, 5-Second-stage guide cone, 51-Jet base, 52-First air inlet box, 53-Air inlet pipe, 54-Air inlet channel, 55-Airflow distribution ring, 551-First positioning ring 552-Second positioning ring, 553-Diverter blade, 56-Injector nozzle, 57-Air compressor, 58-Air storage tank, 59-Air guide pipe, 6-Fluidized air distribution mechanism, 61-Second air inlet box, 62-Cold air delivery pipe, 63-Fluidized bed base, 64-Air cooler, 65-Gas buffer tank, 66-Air distribution pipe, 67-Short pipe, 68-Air cap, 7-Slag discharge pipe, 8-Exhaust pipe, 81-Filter screen, 9-Centrifugal separator, 10-Slag discharge pipe, 11-Water cooling jacket, 12-Horizontal baffle, 13-Water inlet branch pipe, 14-Water outlet branch pipe, 15-Water inlet main pipe, 16-Water outlet main pipe. Implementation

[0020] The present invention will be further described below with reference to the embodiments and accompanying drawings, but this does not limit the present invention in any way. Any changes or substitutions made based on the teachings of the present invention are within the protection scope of the present invention.

[0021] like Figures 1-3As shown, the dry cooling system for blast furnace molten slag of the present invention includes a dry cooling tower 1 and a slag-transferring intermediate tank 2 located at the top of the dry cooling tower 1. The dry cooling tower 1 adopts the structure used in the prior art, including a lower cone, a cylindrical body, and an upper end cap connected sequentially from bottom to top. The lower cone, cylindrical body, and upper end cap are all made of high-temperature resistant materials. The inner cavity of the slag-transferring intermediate tank 5 is configured to gradually decrease in size from top to bottom, and the bottom of the slag-transferring intermediate tank 2 is configured as a pot bottom shape. A lid 21 is movably installed above the slag-transferring intermediate tank 2, and a closure mechanism connected to the lid 21 is provided above the dry cooling tower 1. The mechanism, including the closing mechanism, can drive the lid 21 to close or open the intermediate slag transfer tank. A transition cooling cone 3 is installed at the top of the dry cooling tower 1. The transition cooling cone 3 has a structure that is larger at the top and smaller at the bottom. The upper end of the transition cooling cone 3 is fixedly installed on the upper end cap. A primary guide cone nozzle 4 extending to the transition cooling cone 3 is installed at the bottom of the intermediate slag transfer tank 2. The primary guide cone nozzle 4 also has a structure that is larger at the top and smaller at the bottom. A spray mechanism is installed on the upper part of the transition cooling cone 3, which can spray cold mist water into the transition cooling cone. A secondary guide cone nozzle 5 is installed at the bottom of the transition cooling cone 4. The secondary guide cone nozzle 5 has a structure that is larger at the top and smaller at the bottom. An air jet mechanism is provided on the lower outer side of the secondary guide nozzle 5. A fluidizing air distribution mechanism 6 is provided at the lower part of the dry cooling tower 1. A slag discharge pipe 7 is provided on the fluidizing air distribution mechanism 6. An exhaust pipe 8 is provided at the upper part of the dry cooling tower 1 at an upward angle. A filter screen 81 is provided at the inlet of the exhaust pipe 8. A centrifugal separator 9 is provided on the exhaust pipe 8. The centrifugal separator 9 can centrifuge and separate the high-temperature gas discharged from the exhaust pipe, separating the powder particles carried in the high-temperature gas. A slag discharge pipe 10 is provided at the bottom of the dry cooling tower 1 and the centrifugal separator 9. A water-cooled wall assembly is provided on the outer wall of the dry cooling tower 1. The water-cooled wall assembly can absorb the heat energy generated during the cooling process in the dry cooling tower 2, reduce the cooling temperature in the dry cooling tower 2, and realize the recovery of heat energy.

[0022] When this system is in use, the closing mechanism opens the lid 21, allowing the molten slag produced during blast furnace smelting to be introduced into the intermediate slag drum 2. Then, the closing mechanism closes the lid 21 onto the intermediate slag drum 2. This opening and closing of the lid 21 prevents high-speed airflow from directly spraying onto the surface of the molten slag, thus preventing splashing and material waste, and ensuring safety. The molten slag entering the intermediate slag drum 2 is discharged through the primary guide cone nozzle 4. As the flow area within the primary guide cone nozzle 4 gradually decreases, the flow velocity slows down. Atomizing mechanism sprays cold water into the transition cooling cone 3. The sprayed cold water first atomizes and cools the molten slag. After cooling, the temperature of the molten slag decreases to a certain extent. At this point, the molten slag, cooled by spray cooling, can converge at the secondary guide cone nozzle 5 and then flow out through it. The flow rate of the molten slag slows down again, and the flow area decreases further. After flowing out of the secondary guide cone nozzle 5, the clump-like molten slag flattens. Then, compressed air is sprayed around the molten slag using a jet mechanism. This compressed air provides 360° surround cooling to the sheet-like molten slag. The compressed air and molten slag make full and uniform contact in the upper part of the dry cooling tower 1, causing the molten slag to be cooled and broken into fine powder particles, thus solving the problem of uneven airflow affecting the dripping molten slag. The uneven suction force generated by the slag can cause slag to clog the nozzles. This can be addressed by ensuring uniform flow rate and velocity of compressed air entering the dry cooling tower 1, reducing collisions between powder particles after molten metal cooling and crushing, minimizing particle adhesion, and preventing blockage. This facilitates continuous cooling of the molten slag, ensuring efficient and stable system operation, reducing compressed air consumption, and lowering operating costs. After being cooled by the jetting mechanism, the powder particles flow downwards within the dry cooling tower 1. At this point, the fluidized bed air distribution mechanism 6 uniformly and quantitatively delivers cold air to the lower part of the dry cooling tower 1. The cold air keeps the powder particles in a suspended state within the dry cooling tower 1. The temperature of the cold air is lower than that of the powder particles, so the cold air can quickly absorb the temperature of the powder particles and cool them down quickly. After secondary cooling, the powder particles are discharged from the dry cooling tower 1 through the slag discharge pipe 7 and then through the slag discharge pipe 10. The fluidized bed air distribution mechanism 6 can make the contact area between the cold air and the powder particles larger and more uniform, which can achieve a better cooling effect. After being completely cooled, the powder particles are discharged from the dry cooling tower 1 through the slag discharge pipe 7 and then through the slag discharge pipe 10. The high-temperature gas generated during the cooling process in the dry cooling tower 1 is discharged from the exhaust pipe 8. After passing through the centrifugal separator 9 to separate the small amount of powder particles it carries, the high-temperature gas can enter the subsequent waste heat recovery unit for waste heat recovery treatment.

[0023] Furthermore, the closing mechanism includes a support frame 22, a movable rotating shaft 23, a lifting cylinder 24, and a drive motor 25. The lifting cylinder 24 is a mechanism used in the prior art, and finished components are directly purchased according to the requirements of stroke, pressure, etc. The drive motor 25 is also a prior art, and finished products are directly purchased according to the power required. The support frame 22 is installed on the top of the dry cooling tower 1, the lifting cylinder 24 is installed on the support frame 22, and the lower end of the movable rotating shaft 23 is rotatably installed on the lifting cylinder 24. A horizontal connecting rod 26 is installed on the barrel cover 21, and the horizontal connecting rod 26 is fixedly installed on the movable rotating shaft 23. A driven bevel gear 27 is installed on the upper part of the movable rotating shaft 23 on the upper side of the horizontal connecting rod 26. The drive motor 25 is installed on the top of the support frame 22 on one side of the movable rotating shaft 23. A driving bevel gear 28 that cooperates with the driven bevel gear 27 is installed on the output shaft of the drive motor 25. When the barrel cover 21 is opened, the lifting cylinder 24... 4. Control the movable shaft 23 to rise. During the rising process, the movable shaft 23 can open the barrel cover 21. When the movable shaft 23 rises to the point where the driven bevel gear 28 and the driving bevel gear 27 mesh, the drive motor 25 drives the driving bevel gear 27 to rotate. During the rotation of the driving bevel gear 27, the movable shaft 23 can be rotated. The movable shaft 23 can drive the horizontal connecting rod 26 and the barrel cover 21 to rotate. Rotate to above the slag intermediate barrel 2 to facilitate feeding and other operations. When it is necessary to close the barrel cover 21, the drive motor 25 drives the driving bevel gear 27 to rotate in the opposite direction, thereby driving the driven bevel gear 28, the movable shaft 23, the horizontal connecting rod 26 and the barrel cover 21 to rotate synchronously. When the barrel cover 21 is directly above the slag intermediate barrel 2, the drive motor 25 stops working. The lifting cylinder 24 drives the movable shaft 23, the horizontal connecting rod 26 and the barrel cover 21 to move down until the barrel cover 21 is closed above the slag intermediate barrel 2.

[0024] Preferably, to prevent the molten slag in the intermediate slag bin 2 from sticking to the wall or causing blockage, and to ensure the smooth discharge of the primary guide cone nozzle 4, a stirring rod 29 is rotatably mounted on the bin cover 21. A spiral stirring blade 210 is mounted on the stirring rod 29. A stirring motor 211, which is connected to the stirring rod 29, is mounted on the top of the bin cover 21. The stirring motor 211 is a structure used in the prior art, and finished products are directly purchased according to the requirements of use. When the bin cover 21 is closed on the intermediate slag bin 2, the stirring motor 211 can be turned on. The stirring motor 211 drives the stirring rod 29 to rotate. During the rotation of the stirring rod 29, the spiral stirring blade 210 can rotate. The spiral stirring blade 210 can stir the molten slag in the intermediate slag bin 2, preventing it from sticking to the wall or causing blockage of the primary guide cone nozzle 4.

[0025] Furthermore, the spraying mechanism includes a water supply pipe 31 and an annular pipe 32. A flow control valve is installed on the water supply pipe 31. The annular pipe 32 is installed on the outside of the transition cooling cone 3. The water inlet pipe 31 is connected to the annular pipe 32. A plurality of atomizing nozzles 33 extending into the transition cooling cone 3 are installed on the annular pipe 32. The atomizing nozzles 33 use a pressurized structure used in the prior art. The atomizing nozzles 33 can form cold water into spray droplets, which allows the spray droplets to fully contact the molten slag.

[0026] Furthermore, the jet mechanism includes a jet base 51, a first air distribution box 52, and an air inlet pipe 53. The first air distribution box 52 has a hollow internal structure. The jet base 51 is fixedly installed on the outside of the secondary guide nozzle 5 by a support rod. Multiple air inlet channels 54 are evenly distributed inside the jet base 51. An airflow distribution ring 55 is provided inside each air inlet channel 54. A jet nozzle 56 is detachably installed at the outlet of each air inlet channel 54. The jet nozzle 56 has a downwardly bent cross-section. The inner diameter gradually decreases along the airflow direction. The first air distribution box 52 is located above the jet base 51. The air inlet pipe 53 is connected to the first air distribution box 52. An air compressor 57 and an air storage tank 58 are sequentially arranged on the air inlet pipe 53. Multiple air guide pipes 59 connected to the air inlet channel 54 are evenly distributed at the bottom of the first air distribution box 52. When the jet mechanism is in use, the air compressor 57 is turned on, and the compressed air generated by the air compressor 57 enters the air storage tank 58, and then enters the first air distribution box 52 through the air inlet pipe 53. After being evenly distributed by the first air distribution box 52, the compressed air enters the corresponding air intake channel 54 through the air guide pipe 59. The compressed air directly serves as the power source for the airflow distribution ring 55, driving the airflow distribution ring 55 to rotate. The rotation of the airflow distribution ring 55 causes the compressed air in the air intake channel 54 to change direction and generate airflow rotation, thereby ensuring that the compressed air is evenly mixed before flowing into the secondary guide cone nozzle 5. Afterward, the evenly mixed high-pressure airflow is ejected through the injection nozzle 56, and the molten slag drips under the action of gravity. The dripping molten slag... When the slag droplets come into contact with the high-pressure airflow, they are atomized and broken into a large number of fine powder particles. Preferably, the airflow distribution ring 55 includes a first positioning ring 551 and a second positioning ring 552 arranged coaxially. The first positioning ring 551 and the second positioning ring 552 are rotatably installed in the air intake channel 54. A plurality of diverting blades 553 are evenly distributed between the first positioning ring 551 and the second positioning ring 552, and the two ends of the plurality of diverting blades 553 are respectively fixedly connected to the first positioning ring 551 and the second positioning ring 552 in a one-to-one correspondence.

[0027] Furthermore, the fluidized bed air distribution mechanism 6 includes a second air inlet box 61, a cold air delivery pipe 62, and a fluidized bed base 63. The second air inlet box 61 has a hollow internal structure and is fixedly installed on the inner wall of the dry cooling tower 1. The cold air delivery pipe 62 is connected to the second air inlet box 61. A cooler 64 and a gas buffer tank 65 are installed on the cold air delivery pipe 62. The cooler 64 can cool the air to generate cold air. A cooler is installed inside the gas buffer tank 65. The gas buffer tank 65 adopts a structure in the prior art to buffer the cold air generated by the cooler 64, ensuring that the flow rate and velocity of the cold air entering the fluidized bed air distribution mechanism 6 are stable. The cooler is a structure used in the prior art and can cool the cold air and reduce the temperature according to the requirements of use. The fluidized bed base 63 is installed on the inner wall of the dry cooling tower 1 above the second air inlet box 61. The upper surface of the fluidized bed base 63 is machined with a large upper end and a large lower end. The slag discharge pipe 7 is installed at the bottom of the conical groove with a small end, and the lower end of the slag discharge pipe 7 passes through the second air inlet box 61. Multiple distribution air holes are evenly distributed on the upper surface of the second air inlet box 61. Multiple air distribution pipes 66 corresponding to the distribution air holes are installed through the fluidized bed base 63. The lower end of the air distribution pipe 66 is connected to the distribution air holes through a short pipe 67. An air cap 68 is installed on the upper end of the air distribution pipe 66. In use, the cold air generated by the cold air blower 64 enters the second air inlet box 61 through the cold air delivery pipe 62. After being evenly distributed by the second air inlet box 61, the cold air passes through the distribution air holes, the short pipe 67, the air distribution pipe 66 and the pipe cap 68 in sequence before entering the dry cooling tower 1 to cool the powder particles again. Preferably, the air cap 68 is evenly distributed with air holes. The air cap 68 is a hemispherical structure or a conical structure, which can prevent the powder particles from clogging the air cap 68 and affecting the uniform distribution of the cold air.

[0028] Furthermore, the water-cooled wall assembly includes a water-cooled jacket 11 spaced apart on the outside of the dry cooling tower 1. The cavity between the water-cooled jacket 11 and the dry cooling tower 1 is a water-cooled cavity. Multiple horizontal baffles 12 are spaced apart from top to bottom within the water-cooled cavity, dividing it into multiple cold water distribution chambers. Each cold water distribution chamber has an inlet branch pipe 13 on the upper part of one side and an outlet branch pipe 14 on the lower part of the other side. The inlet branch pipe 13 is connected to the main inlet pipe 15. The system is connected, with a water pump installed on the main water inlet pipe 15. The branch water outlet pipe 14 is connected to the main water outlet pipe 16. In use, cold water is pumped through the main water inlet pipe 15 into each branch water inlet pipe 13, and then into the corresponding cold water distribution chamber through each branch water inlet pipe 13. The cold water can fully absorb the heat emitted by the cold water distribution chamber. After absorbing the heat, the cold water becomes hot water and is discharged from the corresponding branch water outlet pipe 14. Finally, it is discharged into the subsequent heat recovery system through the main water outlet pipe 16.

Claims

1. A dry cooling system for molten blast furnace slag, characterised in that : Including dry cooling tower (1) and located in dry cooling tower (1) top's slag turning intermediate barrel (2), the upper movable setting of slag turning intermediate barrel (2) has barrel cover (21), the upper of dry cooling tower (1) is provided with the closing mechanism of transmission connection with barrel cover (21), the top of dry cooling tower (1) in is provided with transition cooling cone (3), the bottom of slag turning intermediate barrel (2) is provided with the first level guide flow cone nozzle (4) extending to transition cooling cone (3), the upper portion of transition cooling cone (3) is installed with spray mechanism, the bottom of transition cooling cone (3) is provided with the second level guide flow cone nozzle (5), the lower portion outside of second level guide flow cone nozzle (5) is provided with air injection mechanism, the lower portion of dry cooling tower (1) is provided with fluidized cloth air mechanism (6), the fluidized cloth air mechanism (6) is provided with slag falling pipe (7), the upper portion of dry cooling tower (1) is provided with exhaust pipe (8) and inclines upward, the inlet of exhaust pipe (8) is provided with filter screen (81), the exhaust pipe (8) is provided with centrifugal separator (9), the bottom of dry cooling tower (1) and centrifugal separator (9) is provided with slag discharge pipe (10), the outer wall of dry cooling tower (1) is provided with water cooling wall assembly.

2. A dry cooling system for molten blast furnace slag according to claim 1, characterised in that : The closing mechanism includes support frame (22), movable rotating shaft (23), lifting cylinder (24) and drive motor (25), the support frame (22) is installed on the top of dry cooling tower (1), the lifting cylinder (24) is installed on the support frame (22), the lower end of the movable rotating shaft (23) is rotatably installed on the lifting cylinder (24), the horizontal connecting rod (26) is installed on the barrel cover (21), the horizontal connecting rod (26) is fixedly installed on the movable rotating shaft (23), the driven bevel gear (27) is installed on the upper portion of the movable rotating shaft (23) on the upper side of the horizontal connecting rod (26), the drive motor (25) is installed on the top of the support frame (22) on one side of the movable rotating shaft (23), the output shaft of the drive motor (25) is installed with the driving bevel gear (28) matched with the driven bevel gear (27).

3. A dry cooling system for molten blast furnace slag according to claim 2, characterised in that : The stirring rod (29) is rotatably installed on the barrel cover (21), the helical stirring blade (210) is installed on the stirring rod (29), the stirring motor (211) is installed on the top of the barrel cover (21) and is in transmission connection with the stirring rod (29).

4. A dry cooling system for molten blast furnace slag according to claim 1, characterized in that : The spray mechanism includes water supply pipe (31) and annular pipe (32), the flow control valve is installed on the water supply pipe (31), the annular pipe (32) is installed on the outside of the transition cooling cone (3), the water supply pipe (31) is communicated with the annular pipe (32), a plurality of atomizing nozzles (33) extending into the transition cooling cone (3) are installed on the annular pipe (32).

5. A dry cooling system for molten blast furnace slag according to claim 1, characterized in that The jet mechanism comprises a jet base (51), a first air distribution box (52) and an air inlet pipe (53), the jet base (51) is fixedly installed on the outer side of the secondary flow guide cone nozzle (5) through a support rod, a plurality of air inlet channels (54) are uniformly arranged in the jet base (51), an airflow uniform distribution ring (55) is arranged in the air inlet channel (54), a jet nozzle (56) is detachably installed at the outlet of the air inlet channel (54), the cross section of the jet nozzle (56) is in a downward bending structure, and the inner diameter of the jet nozzle (56) gradually decreases along the airflow direction, the first air distribution box (52) is located above the jet base (51), the air inlet pipe (53) is in communication with the first air distribution box (52), an air compressor (57) and a gas storage tank (58) are sequentially arranged on the air inlet pipe (53), and a plurality of air guide pipes (59) in communication with the air inlet channels (54) are uniformly arranged at the bottom of the first air distribution box (52).

6. A dry cooling system for molten blast furnace slag according to claim 5, characterised in that The airflow uniform distribution ring (55) comprises coaxially arranged first and second positioning rings (551) and (552), the first and second positioning rings (551) and (552) are rotatably installed in the air inlet channel (54), a plurality of flow dividing vanes (553) are uniformly arranged between the first and second positioning rings (551) and (552), and the two ends of the plurality of flow dividing vanes (553) are respectively fixedly connected with the first and second positioning rings (551) and (552) in one-to-one correspondence.

7. A dry cooling system for molten blast furnace slag according to claim 1, characterized in that The fluidized air distribution mechanism (6) comprises a second air inlet box (61), a cold air conveying pipe (62) and a fluidized bed base (63), the second air inlet box (61) is fixedly installed on the inner wall of the dry cooling tower (1), the cold air conveying pipe (62) is in communication with the second air inlet box (61), the cold air conveying pipe (62) is provided with a cold air fan (64) and a gas buffer tank (65), a refrigerating device is installed in the gas buffer tank (65), the fluidized bed base (63) is installed on the inner wall of the dry cooling tower (1) above the second air inlet box (61), a tapered recess with a large upper end and a small lower end is formed on the upper surface of the fluidized bed base (63), the slag falling pipe (7) is installed at the bottom of the tapered recess, the lower end of the slag falling pipe (7) penetrates through the second air inlet box (61), a plurality of distribution air holes are uniformly arranged on the upper surface of the second air inlet box (61), a plurality of air distribution pipes (66) corresponding to the distribution air holes are installed in the fluidized bed base (63) in penetration, the lower end of the air distribution pipe (66) is in communication with the distribution air hole through a short pipe (67), and the upper end of the air distribution pipe (66) is provided with a wind cap (68).

8. A dry cooling system for molten blast furnace slag according to claim 7, characterised in that The wind cap (68) is in a hemispherical structure or a conical structure.

9. A dry cooling system for molten blast furnace slag according to claim 1, characterized in that The water-cooled wall assembly comprises water-cooled jackets (11) arranged at intervals outside the dry cooling tower (1), the cavity between the water-cooled jackets (11) and the dry cooling tower (1) is a water-cooled cavity, a plurality of horizontal partitions (12) are arranged at intervals from top to bottom in the water-cooled cavity, the water-cooled cavity is divided into a plurality of cold water distribution chambers by the plurality of horizontal partitions (12), the upper part of one side of each cold water distribution chamber is provided with an inlet water branch pipe (13), the lower part of the other side of each cold water distribution chamber is provided with an outlet water branch pipe (14), the inlet water branch pipe (13) is communicated with an inlet water main pipe (15), a water pump is installed on the inlet water main pipe (15), and the outlet water branch pipe (14) is communicated with an outlet water main pipe (16).

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