CN211972386U - High-temperature molten slag granulating device - Google Patents
High-temperature molten slag granulating device Download PDFInfo
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- CN211972386U CN211972386U CN202020236847.0U CN202020236847U CN211972386U CN 211972386 U CN211972386 U CN 211972386U CN 202020236847 U CN202020236847 U CN 202020236847U CN 211972386 U CN211972386 U CN 211972386U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The utility model provides a high-temperature molten slag granulating device, which comprises a pair of rollers, a shell, a supporting device, a deslagging roller and the like. The roller pair consists of two identical rollers which are arranged in parallel, tangent and rotate reversely. The roller is composed of an outer cylinder and an inner cylinder, a cooling water pipe is arranged at the upper half part of an annular cavity between the outer cylinder and the inner cylinder, a plurality of nozzles are arranged on the cooling water pipe, water in the cooling water pipe is sprayed to the roller through the nozzles, so that the temperature of the outer surface of the outer cylinder is not more than 100 ℃, and the roller material is ensured not to generate high-temperature creep deformation; the lower half part forms a water cavity with a certain height of water level. The utility model discloses a device, on the one hand pelletizes high temperature slag, retrieves partial heat, and on the other hand, the slag blanket on cylinder surface is not more than 850 ℃ before reacing the slagging-off roller and being peeled off the breakage by the extrusion, and the slag has all been cooled off below the solidification temperature, and the minimum cooling rate of slag is greater than 60 ℃/s, satisfies the requirement of quick quenching.
Description
Technical Field
The utility model relates to a slag comprehensive utilization, concretely relates to high temperature molten slag granulation and waste heat recovery device.
Background
The blast furnace slag is waste discharged from a blast furnace during pig iron smelting, when the furnace temperature reaches 1450-1650 ℃, furnace burden is melted, gangue in ore, ash and cosolvent in coke and other impurities which cannot enter into pig iron form slag which mainly comprises silicate and aluminate and floats on molten iron, and the slag mainly comprises CaO, SiO2, Al2O3, and a small amount of MgO, MnO, FeO, S and the like. The blast furnace slag is waste of iron making, about 0.29 ton of blast furnace slag is generated per ton of pig iron, the tapping temperature is 1450-1650 ℃, and the sensible heat and the solution heat of the blast furnace slag in a molten state reach 1883.6 MJ/t. Calculated according to 6 million tons of pig iron output per year in China, 1.74 million tons of blast furnace slag are generated per year, and the residual heat is equivalent to 1114 ten thousand tons of standard coal. Blast furnace slag is a high-grade waste heat resource no matter the unit heat or the total amount, and is efficient to recycle, thereby being an important way and mode for saving energy, reducing emission and improving the efficiency of secondary energy in the steel industry.
At present, most of domestic blast furnace slag treatment modes are water quenching methods, namely, blast furnace slag is cooled by flushing water, granulated into granulated slag, and the granulated slag is used as a building material raw material after being processed; the slag flushing water is used circularly after being precipitated, filtered and cooled. Because the water quenching converts the high-grade sensible heat of the blast furnace slag into the waste heat of the low-grade slag flushing water, the problems of low recovery rate, low energy grade and limited application existing in the slag flushing water waste heat recovery technology are difficult to solve. In addition, the water quenching method also generates a large amount of water vapor containing harmful gases such as SO2, which causes not only air pollution but also thermal pollution to the surrounding environment. Meanwhile, a large amount of hot water with 70-90 ℃ of corrosivity, high hardness and high suspended matter generated by water quenching is difficult to recover the waste heat. The slag flushing water indirect heat exchange is used for heating in winter by some enterprises in northern areas, and the waste heat recovery rate is less than 10%.
The blast furnace slag dry method waste heat recovery is a process for carrying out blast furnace slag granulation and sensible heat recovery by utilizing direct or indirect contact of blast furnace slag and a heat transfer medium, and has the obvious advantages of effectively recovering the sensible heat of the blast furnace slag and saving a large amount of new water.
The dry sensible heat recovery of blast furnace slag involves two key operations: the slag is firstly granulated into fine solid slag particles, namely blast furnace slag is granulated, and then the waste heat of the high-temperature slag particles is recovered. The granulation process of the blast furnace slag is the basis and the premise for waste heat recovery and is also the main research content of a plurality of research institutions at home and abroad.
The blast furnace slag has low heat conductivity coefficient, and brings difficulty to waste heat recovery. In addition, because of the large total amount of slag, the slag product has the most promising application as a raw material for producing cement, which requires that the content of vitreous body of the slag product is required to meet the requirement, generally more than 95%. The high-temperature slag can be rapidly quenched only in the high-temperature solidification stage to obtain the finished slag with high vitreous body content, so that the realization of rapid quenching is the most important technical requirement in the blast furnace slag granulation stage.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a granulating device of high-temperature molten slag, which realizes the rapid quenching of the blast furnace slag in the granulating stage. The double-roller design is adopted, the roller is divided into an inner roller and an outer roller, and cooling water is introduced between the inner roller and the outer roller for heat exchange. In order to ensure that the slag layer on the surface of the outer cylinder smoothly falls off, each roller is provided with a slag removing roller which is in a gear shape and rotates and is tangent to the roller, and the slag layer on the surface of the roller is crushed into slag particles, so that the rapid quenching granulation effect is realized.
In order to achieve the above purpose, the utility model adopts the following technical means:
a granulating device for high-temperature molten slag comprises a roller pair, a shell, a supporting device, a deslagging roller, a motor, a speed reducer and a transmission gear. The roller pair consists of two identical rollers which are arranged in parallel, tangent and rotate reversely. The rollers are supported by the supporting device, and the two rollers rotate reversely under the driving of the driving device respectively.
The roller consists of an outer cylinder and an inner cylinder, a cooling water pipe is arranged at the upper half part of an annular cavity between the outer cylinder and the inner cylinder, a plurality of nozzles are arranged on the cooling water pipe, and water in the cooling water pipe is sprayed to the roller through the nozzles, so that the temperature of the outer surface of the outer cylinder is not more than 100 ℃, the quenching requirement of blast furnace slag can be met, and meanwhile, the roller material is ensured not to generate high-temperature creep; the lower half part forms a water cavity with a certain height of water level.
Further, the inner walls of the top and bottom of the housing are provided with refractory material. The inner walls of the front, the rear, the left and the right are provided with water-cooling walls, and cooling water is introduced into the water-cooling device.
Furthermore, the end surfaces of the two ends of the roller are provided with baffles, so that a slag groove is formed between the two rollers.
Furthermore, a de-scum roller is arranged on the outer side of each roller. The slag removing roller is arranged in a tangent mode with the roller and rotates under the driving of the motor, the surface of the slag removing roller is in a gear shape, a slag layer on the surface of the roller is extruded and peeled, the slag layer is crushed into slag particles, and the slag particles are discharged from a slag outlet at the bottom after falling.
Molten blast furnace slag is poured into the slag channel between the drums, the blast furnace slag flows downwards in the slag channel due to gravity on the one hand, and an upward movement speed is obtained due to the rotation of the rotating drums on the other hand, and the slag solidifies to form a thin layer on the surface of the drum. The temperature of high-temperature solid slag discharged from the granulating device is about 800-900 ℃, secondary heat exchange is carried out through devices such as a solid particle waste heat boiler and a solid material cooler, and heat is recycled.
In addition, the end faces of the two ends of the roller are provided with water inlets, cooling water enters the cooling water pipe between the inner barrel and the outer barrel from the water inlets and is sprayed to the inner wall of the outer barrel through the nozzle to absorb heat transferred by high-temperature slag, and the cooling water is changed into water vapor after absorbing the heat and is discharged from the exhaust port of the end face of the roller to supply power for a process system or generate power through a steam turbine.
The flow rate of the cooling water is about 80-100L/min. A granulating device for processing 35 ten thousand tons of blast furnace slag annually has a roller with the diameter of 0.8 meter and the length of 1 meter. The rotation speed is about 5-10 rpm. The thickness of the slag layer is about 7mm, and the thickness of the slag layer can be adjusted by changing the rotating speed of the roller.
In addition, the surfaces of the rollers are respectively provided with scrapers for scraping solid slag remained on the surfaces of the rollers after the slag layers on the surfaces of the rollers are crushed by the slag removing rollers.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a high temperature slag pelletization device on the one hand pelletizes high temperature slag, retrieves partly heat, on the other hand, the utility model discloses a device, the slag blanket on cylinder surface is not more than 850 ℃ before reacing the slagging-off roller and being peeled off the breakage by the extrusion, and the slag has all been cooled off below the solidification temperature, and the slag after the breakage can not bond again. The minimum cooling rate of the slag is more than 60 ℃/s, the requirement of rapid quenching is met, the vitreous body content of the solid slag is more than 90 percent, and the solidified slag has high vitreous body content due to rapid quenching and is easy to be used as cement clinker.
The utility model discloses a device, two cylinders and two slagging-off roller symmetrical arrangement, the operation is independently installed, has avoided the connection of rotating equipment, is convenient for maintain and stable continuous operation, easily industrial production.
Adopt the utility model discloses a device learns through the analog computation, and the rate of heat recovery of high temperature slag can reach more than 50%.
And simultaneously, the utility model discloses a device adopts the design of twin drum, and two cylinders dispose a slagging-off roller respectively, and the slagging-off roller surface is the gear shape, can peel off the crushing with the slag blanket extrusion on cylinder surface.
Furthermore, adopt the utility model discloses a device, cylinder comprise inner tube and urceolus, and the inner tube is fixed motionless, are provided with condenser tube and nozzle in the middle of urceolus and the inner tube, guarantee that the urceolus inner wall is in the cooling water all the time and cover down, and the inner wall of shell has water-cooling wall and insulation material simultaneously, guarantees equipment long-term reliable operation jointly.
Drawings
Fig. 1 is a schematic view of the device of the present invention.
Fig. 2 is a schematic view of the driving device of the present invention.
In the figure, (1) a shell, (2) a water cooler, (3) a slag layer, (4) a slag inlet, (5) a slag groove, (6) a baffle, (7) a slag pouring groove, (8) a cooling water pipe, (9) a nozzle, (10) a slag removing roller, (11) slag particles, (12) a conveying belt, (13) a slag discharging port, (14) a fire-resistant layer, (15) a water cavity, (16) a roller, (17) an inner roller, (18) an outer roller, (19) a scraper, (20) a large gear, (21) a small gear, (22) a speed reducer and (23) a motor.
The embodiments of the present invention will be further described with reference to the drawings and examples.
Detailed Description
Example 1:
the present embodiment provides a high temperature slag granulation apparatus, as shown in fig. 1, comprising a pair of drums 16, a casing 1, a slag removing roll 5, and a driving means including a motor 23, a speed reducer 22, and transmission gears (a large gear 20 and a small gear 21). The two rollers 4 are driven by the driving device to rotate reversely.
The drum 16 consists of two identical, parallel-arranged, tangential and counter-rotating drums.
The roller 16 consists of an outer roller 18 and an inner roller 17, a cooling water pipe 8 is arranged at the upper half part of an annular cavity between the outer roller 18 and the inner roller 17, a plurality of nozzles 9 are arranged on the cooling water pipe 8, water in the cooling water pipe 8 is sprayed to the roller 16 through the nozzles 9, so that the temperature of the outer surface of the outer roller 18 is not more than 100 ℃, the quenching requirement of blast furnace slag can be met, and meanwhile, the roller 16 material is ensured not to generate high-temperature creep deformation; the lower half forms a water chamber 15, which contains a water level of a certain height.
The inner walls of the top and bottom of the shell 1 are provided with refractory layers 14. The inner walls of the front, the rear, the left and the right are provided with water cooling walls 2, and cooling water is introduced into the water cooler, so that the cooling is further ensured to be rapid.
The end surfaces of the two ends of the roller 16 are provided with baffles 6, so that a slag groove 5 is formed between the two rollers.
Molten blast furnace slag is poured into the slag channel 5 between the rollers 16, and the blast furnace slag flows downward in the slag channel 5 due to gravity on the one hand, and is solidified to form a thin layer on the surface of the rollers 16 due to the upward moving speed obtained by the rotating action of the rollers 16 on the other hand.
The outer side of each roller 16 is provided with a deslagging roller 10, the deslagging rollers 10 are arranged in a tangent mode with the rollers 16 and rotate under the driving of a motor 23, the surface of each deslagging roller 10 is in a gear shape, a slag layer on the surface of each roller 16 is extruded and stripped, the slag layer is broken into slag particles, and the slag particles are discharged from a slag discharge port 13 after falling and are conveyed by a conveying belt 12 to enter the next working procedure.
The end surfaces of two ends of the roller 16 are provided with water inlets, cooling water enters the cooling water pipes of the outer roller 18 and the inner roller 17 from the water inlets and is sprayed to the inner wall of the outer roller 18 through the nozzle 9 to absorb heat transferred by high-temperature slag, and the cooling water is changed into water vapor after absorbing the heat and is discharged from an exhaust port on the end surface of the roller 16 to be used for a process system or for power generation through a steam turbine.
The temperature of high-temperature solid slag discharged from the granulating device is about 800-900 ℃, secondary heat exchange is carried out through devices such as a solid particle waste heat boiler and a solid material cooler, and heat is recycled.
The flow of the cooling water of the utility model is about 80-100L/min, and the granulating device for annual treatment of 35 ten thousand tons of blast furnace slag has a roller with the diameter of 0.8 meter and the length of 1 meter. The rotation speed is about 5-10 rpm. The thickness of the slag layer is about 7mm, and the thickness of the slag layer can be adjusted by changing the rotating speed of the roller.
The utility model discloses the working process of device does: molten blast furnace slag is poured into a slag groove between the two rollers through a slag inlet, the blast furnace slag flows downwards in the slag groove due to the action of gravity on one hand, and an upward movement speed is obtained due to the rotation action of the rollers on the other hand, and the slag is solidified on the surfaces of the rollers to form a thin layer. The slag removing roller extrudes and peels off the slag layer on the surface of the roller, and the slag layer is crushed into slag particles which are discharged from a slag discharging port after falling. On the one hand, the temperature of the slag layer on the surface of the roller does not exceed 850 ℃ before the slag layer reaches the slag removing roller and is extruded, peeled and crushed, the slag is completely cooled to be below the solidification temperature, and the crushed slag can not be bonded again. The minimum cooling rate of the slag is more than 60 ℃/s, the requirement of rapid quenching is met, on the other hand, cooling water enters a cooling water pipe between the inner roller and the outer roller from a water inlet and is sprayed to the inner wall of the outer roller through a nozzle to absorb heat transferred from high-temperature slag, the cooling water is changed into water vapor after absorbing the heat, and the water vapor is discharged from an exhaust port on the end face of the roller to be used for a process system or used for power generation through a steam turbine.
Claims (10)
1. A high-temperature molten slag granulating device comprises a shell (1), wherein a slag inlet (4) is formed in the upper surface of the shell (1), and a slag discharge port (13) is formed in the bottom of the shell (1), and is characterized in that a pair of rollers (16) are horizontally arranged in the shell (1), the heights of the shafts of the rollers (16) are equal, the rollers (16) are tangent and rotate in opposite directions, a slag groove (5) is formed at the tangent position of the two rollers (16), and high-temperature molten slag falling from the slag inlet (4) falls into the slag groove (5);
slag removing rollers (10) are respectively arranged at the outer sides of the two rollers (16) and are used for peeling and crushing slag on the outer wall of the rollers (16);
and a water cooling system is also arranged in the roller (16) and is used for cooling the outer wall of the roller (16) by water cooling before the roller (16) rotates to the deslagging roller (10).
2. The high-temperature slag granulation device as claimed in claim 1, wherein said roller (16) comprises an inner roller (17) and an outer roller (18) sleeved outside the inner roller (17), the inner roller (17) is fixed, the outer roller (18) rotates relatively, a ring cavity is formed between the outer roller (18) and the inner roller (17), and a water cooling system is arranged in the ring cavity and is sprayed to the inner wall of the outer roller (18) for cooling the outer wall of the outer roller (18) with water.
3. The high-temperature molten slag granulation device as claimed in claim 1, wherein the deslagging roller (10) is tangentially arranged with the roller (16) and driven by a motor to rotate, the surface of the deslagging roller (10) is tooth-shaped and is used for extruding and stripping a slag layer on the surface of the roller (16) so as to crush the slag layer into slag particles, and the slag particles are discharged from the slag discharge port (13) after falling.
4. A molten slag granulation plant as defined in claim 1, wherein the inner walls of the top and bottom of the casing (1) are provided with refractory layers (14), and the inner walls of the remaining surfaces of the casing (1) are provided with water coolers (2) into which cooling water is introduced.
5. A hot slag granulation installation as claimed in claim 2, wherein said water cooling system is located in the upper half of the annular chamber, the lower half of the annular chamber forming a water chamber (15) for accumulation to form a water level.
6. The high-temperature slag granulation device as claimed in claim 5, wherein the water cooling system comprises a cooling water pipe (8), a plurality of nozzles (9) are arranged on the cooling water pipe (8), and the cooling water in the cooling water pipe (8) is sprayed to the inner wall of the outer roller (18) through the nozzles (9).
7. A high-temperature slag granulation apparatus as defined in claim 6, wherein the end surfaces of both ends of the drum (16) are provided with water inlets, cooling water enters the cooling water pipe (8) between the inner roll (17) and the outer roll (18) from the water inlets, and the cooling water absorbs heat and turns into steam which is discharged from the exhaust port on the end surface of the drum (16) for waste heat recovery.
8. A molten slag granulation apparatus according to claim 1, wherein the two drums (16) are driven by the drive means to rotate in opposite directions.
9. The high temperature slag granulation apparatus as defined in claim 1, wherein the rotation speed of the drum (16) is 5 to 10 rpm, and the thickness of the slag layer is adjusted by the rotation speed of the drum (16).
10. A high-temperature molten slag granulation apparatus as claimed in claim 1, wherein the surface of the drum (16) is provided with scrapers (19) for scraping off solid slag remaining on the surface of the drum (16) after the slag removing roller (10) breaks the slag layer on the surface of the drum (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020236847.0U CN211972386U (en) | 2020-02-28 | 2020-02-28 | High-temperature molten slag granulating device |
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| CN202020236847.0U CN211972386U (en) | 2020-02-28 | 2020-02-28 | High-temperature molten slag granulating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206131A (en) * | 2020-02-28 | 2020-05-29 | 西安联创分布式可再生能源研究院有限公司 | High-temperature molten slag granulating device |
| CN114592102A (en) * | 2022-03-31 | 2022-06-07 | 铜陵求精机械有限公司 | Resource cleaning and recycling device for metallurgical converter residues |
| WO2023184962A1 (en) * | 2022-04-02 | 2023-10-05 | 南京工业大学 | Drum quick-cooling dry treatment device for blast furnace slag for use in waste heat recovery |
-
2020
- 2020-02-28 CN CN202020236847.0U patent/CN211972386U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206131A (en) * | 2020-02-28 | 2020-05-29 | 西安联创分布式可再生能源研究院有限公司 | High-temperature molten slag granulating device |
| CN114592102A (en) * | 2022-03-31 | 2022-06-07 | 铜陵求精机械有限公司 | Resource cleaning and recycling device for metallurgical converter residues |
| CN114592102B (en) * | 2022-03-31 | 2023-02-28 | 铜陵求精机械有限公司 | Resource cleaning and recycling device for metallurgical converter residues |
| WO2023184962A1 (en) * | 2022-04-02 | 2023-10-05 | 南京工业大学 | Drum quick-cooling dry treatment device for blast furnace slag for use in waste heat recovery |
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