CN110982968A - Dry-process slag granulation system - Google Patents
Dry-process slag granulation system Download PDFInfo
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- CN110982968A CN110982968A CN201911386990.6A CN201911386990A CN110982968A CN 110982968 A CN110982968 A CN 110982968A CN 201911386990 A CN201911386990 A CN 201911386990A CN 110982968 A CN110982968 A CN 110982968A
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- slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a dry-method slag granulation system, which adopts a dry-type processing method for slag, thereby saving a large amount of water resources; the invention carries out heat recovery on high-temperature furnace slag, carries out centrifugal granulation on the high-temperature furnace slag in a molten state, releases heat, carries out primary cooling in a water-cooled wall mode, simultaneously carries out cold slag and hot slag mixing on the high-temperature furnace slag by a slag mixing tank, prevents the hot slag from being adhered, then carries out heat exchange by utilizing heat exchange fins on the periphery of a tank body of a roller heat exchanger, carries out heat recovery by adopting a heat transfer medium, and conveys the absorbed heat to a secondary energy utilization device; the fine slag after the mechanical grinding and crushing of the furnace slag is sent back to the granulation tank through a stranding cage, and waste heat recovery is carried out during the period; the invention effectively improves the heat recovery efficiency by recovering the heat in stages.
Description
Technical Field
The invention relates to a slag processing system, in particular to a dry-method slag granulation system.
Background
The steel metallurgy industry can produce a large amount of high-temperature slag in the production process, the secondary industrial products are not fully and reasonably utilized in the current production process, the common treatment method is mainly based on 'wet process', namely, the high-temperature slag is directly cooled and granulated by using a water cooling mode, the treatment process does not fully utilize the heat of the high-temperature slag, the heat energy of the part is considerable, a large amount of heat energy resources are wasted, meanwhile, the 'wet process' requires a large amount of water resources, the waste of the water resources is caused, and under the era background of energy conservation and emission reduction, the existing production process obviously needs to be optimized and upgraded better.
In view of the above technical drawbacks, patent 2018100329286 discloses a centrifugal slag granulation and waste heat recovery system, which mainly uses an air blower to cool high-temperature slag to recover waste heat, and is a "dry" treatment method.
Patent CN103695581B discloses a blast furnace slag granulation and sensible heat recovery process and equipment, which is also a "dry" treatment method, and realizes granulation and heat recovery by performing segmentation treatment on high-temperature slag, rapidly cooling and then recovering waste heat.
Patent CN104988256B discloses a slag waste heat recovery system, which achieves the purpose of "dry" treatment by performing slag mixing treatment, then performing cooling waste heat recovery and then crushing.
In conclusion, the dry treatment of the high-temperature slag for waste heat recovery is the trend of energy conservation and emission reduction, and the technical problem of how to efficiently recover the waste heat and realize granulation of the high-temperature slag is urgently needed to be solved at present.
Disclosure of Invention
In view of the above background art, the present invention provides a dry-process slag granulation system, which performs granulation processing and waste heat recovery on high-temperature slag by using a "dry" processing method.
The technical scheme adopted by the invention is as follows: a dry-method slag granulation system comprises an agglomeration part, a fragmentation part and a granulation part, wherein the agglomeration part comprises a slag ladle, a slag agglomeration tank, a cold slag distribution disc and an annular turbulent granulation nozzle, the slag agglomeration tank is arranged on the ground through a rack, the slag ladle is arranged at the top of the slag agglomeration tank and extends into the slag agglomeration tank through a pipeline, and the slag ladle controls feeding through a feeding stopper rod; the annular turbulent flow granulation nozzle is provided with a blower for blowing air; the cold slag distributing disc is arranged at the top end of a central shaft of the slag agglomeration tank and is driven by a cold slag distributing motor, and the cold slag feeding hole is arranged right above the cold slag distributing disc; the inner wall of the slag agglomeration tank is provided with a cone disc for collision, the bottom of the slag agglomeration tank is provided with a slag mixing and throwing-out disc, and the slag mixing and throwing-out disc is driven by an external slag throwing motor.
The fragmentation part comprises a roller heat exchanger, the roller heat exchanger is arranged on the ground through a rotary component support, an inlet of the roller heat exchanger is connected to a discharge hole of a slag agglomeration tank through a pipeline, an outlet of the roller heat exchanger is provided with a cold slag outlet, one part of the cold slag outlet is connected to a fan through a ventilation pipeline, the other part of the cold slag outlet is connected to a material receiving cone hopper, and heat dissipation fins are arranged outside the roller heat exchanger.
The granulating part comprises a screening machine and a crushing machine, the screening machine is connected to an outlet of the material receiving cone hopper, the outlet of the screening machine is provided with two channels, one channel is a coarse slag channel, and the other channel is a fine slag channel; the coarse slag channel is communicated with an inlet of the crusher, the fine slag channel is communicated with an outlet of the crusher, a cold slag tank is arranged at an outlet end of the crusher, an outlet of the crusher is communicated with an inlet of the cold slag winding-up machine, and an outlet of the cold slag winding-up machine is communicated with a cold slag feeding port.
Furthermore, a spiral feeding channel is arranged in the roller heat exchanger, the air flow containing the residual heat hot air at the outlet of the spiral feeding channel is blown back to the annular turbulent flow granulation nozzle through a fan, and the slag at the outlet of the spiral feeding channel falls into the material receiving cone hopper through a cold slag outlet.
Further, one part of the slag crushed and refined by the crusher enters a cold slag tank, and the other part of the slag is sent to a cold slag feeding port through a cold slag winding machine.
Further, the outer ring of the cold slag winding and lifting machine is provided with additional radiating fins; the slag agglomeration tank body is provided with a water cooling layer.
Furthermore, the inclination angle of the drum heat exchanger is 26-30 degrees.
Further, the heat transfer medium is molten salt or metallic tin.
The production process of the dry-method slag granulation system comprises the following steps: (a) agglomeration and heat absorption: firstly, sending high-temperature furnace slag into a slag ladle, and controlling the speed of the high-temperature furnace slag leaking from a leakage opening at the lower part of the slag ladle through a feeding stopper rod in the slag ladle; meanwhile, cold slag in the cold slag winding and lifting machine is conveyed to a cold slag distributing disc through a cold slag feeding port, the cold slag distributing disc is driven by a cold slag distributing motor to rotationally distribute the cold slag, meanwhile, a fan blows air through an annular turbulent flow granulating nozzle, high-speed airflow mixes high-temperature slag with the cold slag to prevent adhesion, the mixed slag is centrifugally thrown out to a conical disc at high speed through a slag mixing and throwing-out disc, block-shaped slag is formed through collision, and a water cooling layer in a slag blocking tank cools and absorbs heat of the high-temperature slag in the blocking process; (b) fragmentation and heat absorption: the mixed slag entering the roller heat exchanger continuously exchanges heat in the roller heat exchanger, heat is transferred out through the radiating fins, and at the moment, part of high-temperature hot air returns to the slag agglomeration tank through the fan; (c) granulation heat absorption: the slag enters a screening machine from a material receiving hopper, the slag particles with smaller diameters fall to a fine slag channel through the screening machine, the slag particles with larger diameters fall to a coarse slag channel through the screening machine and enter a crushing machine for crushing and granulating, finally, the granulated slag enters a cold slag roll for upgrading and is subjected to heat exchange through other heat radiating fins, the slag in the cold slag roll for upgrading is secondarily utilized, and the slag is continuously and fully utilized in a slag agglomeration tank; (d) when the primary slag granulation is finished, all slag enters a cold slag tank.
Due to the adoption of the technical scheme, the invention has the following advantages: (1) the invention adopts a dry-type treatment method for the furnace slag, thereby saving a large amount of water resources; (2) the high-temperature furnace slag is subjected to segmented heat recovery, the high-temperature furnace slag is subjected to cold slag and hot slag mixing through the slag mixing tank of the slag agglomeration tank, the hot slag is prevented from being adhered, the slag is stirred through high-speed airflow for agglomeration, and the slag agglomeration is facilitated through the arrangement of the conical disc; (3) the roller heat exchanger further recovers heat, and meanwhile, high-temperature airflow is recycled, so that the heat of molten slag can not be absorbed again when the slag is directly blown, and the waste of energy is reduced; (4) the crusher carries out secondary crushing process on the slag, and the cold slag roll is used for upgrading and lifting the slag, so that not only is the heat recovery efficiency of the slag improved, but also the crushing effect of the slag is effectively improved; meanwhile, the repeated cyclic utilization of the slag is realized; (5) the heat recovery of the first stage and the third stage is series low-temperature heat recovery, and the heat recovery efficiency is effectively improved by recovering the heat in stages.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 and 3 are schematic views of a part of the structure of the present invention.
Reference numerals: 1-feeding stopper rod; 2-slag ladle; 3-a cold slag distributing motor; 4-a cold slag distributing disc; 5-a slag agglomeration tank; 6, a fan; 7-a slag throwing motor; 8-mixing slag and throwing out the slag from a disc; 9-conical disc; 10-annular turbulent granulating nozzle; 11-a cold slag feeding port; 12-cold slag winding and lifting machine; 13-a pulverizer; 14-coarse slag channel; 15-fine slag channel; 16-screening machine; 17-receiving cone hopper; 18-drum heat exchanger; 19-a cold slag outlet; 20-cooling the slag tank; 21-a control center; 22-Heat sink fins.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
Example (b): the structure of the present invention is shown in fig. 1 to 3, and in the specific working process, the heat recovery structure in the agglomeration part and the granulation part of the present invention is an integral low-temperature heat recovery system, which is specifically realized by the following structure: the agglomeration part comprises a slag ladle 2, a slag agglomeration tank 5, a cold slag distribution disc 4 and an annular turbulent flow granulation nozzle 10, wherein the slag agglomeration tank 5 is arranged on the ground through a rack, the slag ladle 2 is arranged at the top of the slag agglomeration tank 5 and extends into the slag agglomeration tank 5 through a pipeline, and the feeding of the slag ladle 2 is controlled through a feeding stopper rod 1; the annular turbulent granulation nozzle 10 is provided with a blower 6 for blowing air; the cold slag distributing disc 4 is arranged at the top end of a central shaft of the slag agglomeration tank 5 and is driven by the cold slag distributing motor 3, and the cold slag feeding hole 11 is arranged right above the cold slag distributing disc 4; the inner wall of the slag agglomeration tank 5 is provided with a cone disc 9 for collision, the bottom of the slag agglomeration tank 5 is provided with a slag mixing and throwing-out disc 8, and the slag mixing and throwing-out disc 8 is driven by an external slag throwing motor 7.
The above-mentioned structural arrangement mainly utilizes the mode of circulating water cooling, realizes low temperature heat recovery, and the circulating water after being heated directly sends the user and uses.
The crushing part mainly utilizes molten salt or metallic tin as a heat transfer medium to carry out high-temperature heat recovery, and directly recycles the internal high-temperature airflow, and is realized by the following structure: the crushing part comprises a roller heat exchanger 18, the roller heat exchanger 18 is supported on the ground through a rotating part, the inlet of the roller heat exchanger is connected with the discharge hole of the slag agglomeration tank 5 through a pipeline, the outlet of the roller heat exchanger is provided with a cold slag outlet 19, one part of the cold slag outlet 19 is connected with the fan 6 through a vent pipeline, the other part of the cold slag outlet is connected with the material receiving cone hopper 17, and the outside of the roller heat exchanger 18 is provided with heat radiating fins 22.
In order to reduce the additional slag and the energy waste, the invention directly and repeatedly utilizes the crushed and granulated fine slag for agglomeration, and is realized by the following structure.
The granulating part comprises a screening machine 16 and a crushing machine 13, the screening machine 16 is connected to an outlet of a material receiving conical hopper 17, the outlet of the screening machine 16 is provided with two channels, one channel is a coarse slag channel 14, and the other channel is a fine slag channel 15; the coarse slag channel 14 is communicated with an inlet of the crusher 13, the fine slag channel 15 is communicated with an outlet of the crusher 13, a cold slag tank 20 is arranged at an outlet end of the crusher 13, an outlet of the crusher 13 is communicated with an inlet of the cold slag winding and lifting machine 12, and an outlet of the cold slag winding and lifting machine 12 is communicated with a cold slag feeding port 11. Meanwhile, the agglomeration, crushing and granulation processes of the slag are realized in the heat recovery process of the two stages of low temperature and high temperature.
The inside of the roller heat exchanger 18 is provided with a spiral feeding channel, the air flow containing residual heat hot air at the outlet is blown back to the annular turbulent flow granulation nozzle 10 through the fan 6, and the slag at the outlet falls into the material receiving cone hopper 17 through the cold slag outlet 19. One part of the slag crushed and refined by the crusher 13 enters a cold slag tank 20, and the other part of the slag is sent to a cold slag feeding port 11 through a cold slag winding machine 12. The outer ring of the cold slag winding and lifting machine 12 is provided with another radiating fin 22; a water cooling layer is arranged on the body of the slag agglomeration tank 5. The inclination angle of the drum heat exchanger 18 is 26-30 degrees.
The specific production process of the invention is as follows: a agglomeration and heat absorption: firstly, high-temperature furnace slag is sent to a slag ladle 2, and the speed of the high-temperature furnace slag leaking from a leakage opening at the lower part of the slag ladle 2 is controlled through a feeding stopper rod 1 in the slag ladle 2; meanwhile, cold slag in the cold slag winding and lifting machine 12 is conveyed to the cold slag distributing disc 4 through the cold slag feeding port 11, the cold slag distributing motor 3 drives the cold slag distributing disc 4 to rotationally distribute the cold slag, meanwhile, the fan 6 blows air through the annular turbulent flow granulating nozzle 10, high-speed air flow mixes the high-temperature slag with the cold slag to prevent adhesion, the mixed slag is centrifugally thrown out to the conical disc 9 at a high speed through the slag mixing and throwing-out disc 8, block-shaped slag is formed through collision, and in the agglomeration process, a water cooling layer in the slag agglomeration tank 5 cools and absorbs heat to the high-temperature slag; b, fragmentation and heat absorption: the mixed slag entering the drum heat exchanger 18 continuously exchanges heat in the drum heat exchanger, heat is transferred out through the radiating fins 22, and at the moment, part of high-temperature hot air returns to the slag agglomeration tank 5 through the fan 6; c, granulation and heat absorption: the slag enters a screening machine 16 from a receiving hopper 17, the slag particles with smaller diameters fall to a fine slag channel 15 through the screening machine 16, the slag particles with larger diameters fall to a coarse slag channel 14 through the screening machine 16 and enter a crushing machine 13 for crushing and granulating, finally the granulated slag enters a cold slag roll upgrading stage 12 for heat exchange through other heat radiating fins 22, the slag in the cold slag roll upgrading stage 12 is secondarily utilized, and the slag is continuously and fully utilized in a slag agglomeration tank 5; d when the primary slag granulation is completed, all the slag enters the cold slag pot 20.
Claims (7)
1. A dry-process slag granulation system comprises an agglomeration part, a fragmentation part and a granulation part, and is characterized in that:
the agglomeration part comprises a slag ladle (2), a slag agglomeration tank (5), a cold slag distributing disc (4) and an annular turbulent flow granulation nozzle (10), wherein the slag agglomeration tank (5) is arranged on the ground through a rack, the slag ladle (2) is arranged at the top of the slag agglomeration tank (5) and extends into the slag agglomeration tank (5) through a pipeline, and the feeding of the slag ladle (2) is controlled through a feeding stopper rod (1); a blower (6) for blowing air is arranged on the annular turbulent flow granulation nozzle (10); the cold slag distributing disc (4) is arranged at the top end of a central shaft of the slag agglomeration tank (5) and is driven by the cold slag distributing motor (3), and the cold slag feeding hole (11) is arranged right above the cold slag distributing disc (4); a cone disc (9) for collision is arranged on the inner wall of the slag agglomeration tank (5), a slag mixing and throwing-out disc (8) is arranged at the bottom of the slag agglomeration tank (5), and the slag mixing and throwing-out disc (8) is driven by an external slag throwing motor (7);
the crushing part comprises a roller heat exchanger (18), the roller heat exchanger (18) is supported on the ground through a rotating part, the inlet of the roller heat exchanger is connected to the discharge hole of the slag agglomeration tank (5) through a pipeline, the outlet of the roller heat exchanger is provided with a cold slag outlet (19), one part of the cold slag outlet (19) is connected to the fan (6) through a ventilation pipeline, the other part of the cold slag outlet is connected to the material receiving cone hopper 17, and the outside of the roller heat exchanger (18) is provided with radiating fins (22);
the granulating part comprises a screening machine 16 and a crushing machine (13), the screening machine (16) is connected to an outlet of a material receiving cone hopper (17), the outlet of the screening machine (16) is provided with two channels, one channel is a coarse slag channel (14), and the other channel is a fine slag channel (15); the coarse slag channel (14) is communicated with an inlet of the crusher (13), the fine slag channel (15) is communicated with an outlet of the crusher (13), a cold slag tank (20) is arranged at an outlet end of the crusher (13), an outlet of the crusher (13) is communicated with an inlet of the cold slag winding and lifting machine (12), and an outlet of the cold slag winding and lifting machine (12) is communicated with the cold slag feeding port (11).
2. The dry slag granulation system as defined in claim 1, wherein: the inside of the roller heat exchanger (18) is provided with a spiral feeding channel, the air flow containing residual heat hot air at the outlet is blown back to the annular turbulent flow granulation nozzle (10) through a fan (6), and the slag at the outlet falls into a material receiving conical hopper (17) through a cold slag outlet (19).
3. The dry slag granulation system as defined in claim 1, wherein: one part of the slag crushed and refined by the crusher (13) enters a cold slag tank (20), and the other part of the slag is sent to a cold slag feeding port (11) through a cold slag winding machine (12).
4. A dry slag granulation system as defined in claim 1 or 3, wherein: the outer ring of the cold slag winding and lifting machine (12) is provided with another radiating fin (22); a water cooling layer is arranged on the body of the slag agglomeration tank (5).
5. The dry slag granulation system as defined in claim 1, wherein: the inclination angle of the drum heat exchanger (18) is 26-30 degrees.
6. The dry slag granulation system as defined in claim 1, wherein: the heat transfer medium is molten salt or metallic tin.
7. The production process using the dry slag granulation system as set forth in claim 1, wherein:
(a) agglomeration and heat absorption: firstly, high-temperature furnace slag is sent into a slag ladle (2), and the speed of the high-temperature furnace slag leaking from a leakage opening at the lower part of the slag ladle (2) is controlled through a feeding stopper rod (1) in the slag ladle (2); meanwhile, cold slag in the cold slag winding and lifting machine (12) is conveyed to the cold slag distributing disc (4) through the cold slag feeding hole (11), the cold slag distributing motor (3) drives the cold slag distributing disc (4) to rotationally distribute the cold slag, meanwhile, the fan (6) blows air through the annular turbulent flow granulating nozzle (10), high-speed airflow mixes the high-temperature slag and the cold slag to prevent adhesion, the mixed slag is centrifugally thrown out to the conical disc (9) at a high speed through the slag mixing and throwing-out disc (8), block-shaped slag is formed through collision, and in the agglomeration process, a water cooling layer in the slag agglomeration tank (5) cools and absorbs heat of the high-temperature slag;
(b) fragmentation and heat absorption: the mixed slag entering the roller heat exchanger (18) continuously exchanges heat in the roller heat exchanger, heat is transferred out through the radiating fins (22), and part of the high-temperature hot air returns to the slag agglomeration tank (5) through the fan (6);
(c) granulation heat absorption: slag enters a screening machine (16) from a material receiving hopper (17), slag particles with smaller diameters fall to a fine slag channel (15) through the screening machine (16), slag particles with larger diameters exit the screening machine (16) and fall to a coarse slag channel (14) and enter a crushing machine (13) for crushing and granulation, finally, granulated slag enters a cold slag roll upgrading stage (12) for heat exchange through other heat radiating fins (22), and the slag in the cold slag roll upgrading stage (12) is recycled and is continuously and fully utilized in a slag agglomeration tank (5);
(d) when the primary slag granulation is completed, all the slag enters a cold slag tank (20).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112570424A (en) * | 2020-11-25 | 2021-03-30 | 南京研塑环保科技有限公司 | Environment-friendly treatment method for iron and steel smelting furnace slag |
| CN114057371A (en) * | 2020-07-31 | 2022-02-18 | 宝山钢铁股份有限公司 | Sludge drying treatment method based on particle heat source |
| CN114057372A (en) * | 2020-07-31 | 2022-02-18 | 宝山钢铁股份有限公司 | Roller residue heat drying method for organic sludge |
| CN114231676A (en) * | 2021-12-13 | 2022-03-25 | 扬州华航特钢有限公司 | High-efficiency recovery and regeneration device for electric furnace slag |
| CN114507758A (en) * | 2021-12-31 | 2022-05-17 | 西安交通大学 | Steel slag waste heat recovery, f-CaO graded digestion and carbon emission reduction system |
| CN115094168A (en) * | 2022-06-02 | 2022-09-23 | 中节能工业节能有限公司 | Slag recovery system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057371A (en) * | 2020-07-31 | 2022-02-18 | 宝山钢铁股份有限公司 | Sludge drying treatment method based on particle heat source |
| CN114057372A (en) * | 2020-07-31 | 2022-02-18 | 宝山钢铁股份有限公司 | Roller residue heat drying method for organic sludge |
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| CN114231676A (en) * | 2021-12-13 | 2022-03-25 | 扬州华航特钢有限公司 | High-efficiency recovery and regeneration device for electric furnace slag |
| CN114507758A (en) * | 2021-12-31 | 2022-05-17 | 西安交通大学 | Steel slag waste heat recovery, f-CaO graded digestion and carbon emission reduction system |
| CN115094168A (en) * | 2022-06-02 | 2022-09-23 | 中节能工业节能有限公司 | Slag recovery system |
| CN115094168B (en) * | 2022-06-02 | 2024-02-20 | 中节能工业节能有限公司 | Slag recovery system |
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