CN110643758A - Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag - Google Patents
Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag Download PDFInfo
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- CN110643758A CN110643758A CN201911110722.1A CN201911110722A CN110643758A CN 110643758 A CN110643758 A CN 110643758A CN 201911110722 A CN201911110722 A CN 201911110722A CN 110643758 A CN110643758 A CN 110643758A
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- slag
- temperature liquid
- slag collecting
- steel slag
- liquid steel
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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 provides a method and a device for resourceful treatment and heat energy recovery of high-temperature liquid steel slag, which comprise a slag receiving tank, a double-hook crane, a tundish, a porous high-speed air nozzle, a coarse slag collecting tank, a fine slag collecting tank, an air compressor and a steam pocket, wherein a flat plate type waste heat boiler assembly and a purified water supply pipe are arranged close to the inner walls of the coarse slag collecting tank and the fine slag collecting tank, two sides and the tail of the coarse slag collecting tank and the tail of the fine slag collecting tank extend upwards, a semicircular arc-shaped pipe boiler assembly is arranged at the top of the coarse slag collecting tank and the fine slag collecting tank, and a plurality of atomized water nozzles are continuously arranged on the semicircular arc. The invention can realize recycling of most of the heat energy of the high-temperature liquid steel slag and conversion of the heat energy into steam and hot water resources which can be utilized while realizing the recycling treatment of the high-temperature liquid steel slag.
Description
Technical Field
The invention relates to the resourceful treatment and heat energy recycling of high-temperature liquid steel slag, in particular to environmental protection; energy conservation and emission reduction; and (5) recycling and comprehensively utilizing resources.
Background
At present, although a solution for recycling treatment of high-temperature liquid steel slag exists at home and abroad, the waste of steel slag heat energy resources is caused because heat energy of the high-temperature liquid steel slag cannot be recycled, or the steel slag heat energy resources are not fully recycled and have poor operability, so that the steel slag recycling method is not attractive and deficient.
Disclosure of Invention
In order to solve the above disadvantages in the prior art, we have invented a method and apparatus for recycling high-temperature liquid steel slag and recovering heat energy, which can realize recycling high-temperature liquid steel slag and efficiently recover steel slag resources, and also can realize recovering heat energy of high-temperature liquid steel slag to produce steam and hot water for utilization.
The invention adopts a method and a device for recycling high-temperature liquid steel slag and recovering heat energy, namely, when a converter (or an electric furnace) discharges slag, the high-temperature liquid steel slag is poured into a slag receiving tank 1 on a slag tank car under the furnace, the slag tank car is opened to a steel slag processing span, the slag receiving tank 1 is hung in front of a tundish 3 by a double-hook crane 2 and aligned with the central line of the tundish 3, a crane auxiliary hook is started to slowly tip over the slag receiving tank 1, the high-temperature liquid steel slag is poured into the tundish 3, the high-temperature liquid steel slag flows out from a launder and freely falls at the launder after the flow of the high-temperature liquid steel slag is controlled by a water gap of the tundish 3, compressed air produced by an air compressor 7 and sent into a porous high-speed air nozzle 4 through a pipeline and high-speed air flow sprayed out of the nozzle during the falling process, the high-temperature liquid steel slag is immediately granulated into liquid drops with the particle size of 0-5mm by the high-, the temperature of the surrounding air flow is rapidly increased from normal temperature to about 1500 ℃, and meanwhile, the liquid steel slag drops directly transfer heat to the flat plate type waste heat boiler component 17 in a heat radiation mode; in the process that the high-speed air flow heated to about 1500 ℃ moves in the horizontal direction, heat is directly transferred to the flat plate type waste heat boiler assembly 17 (the upper part and the extending part of the slag collecting tank) and the semi-circular arch type boiler assembly 18 in a convection heat transfer mode, and water flowing in the boiler assembly is heated until steam is generated.
After flying a certain distance in the horizontal direction along with high-speed air flow, the granulated high-temperature liquid steel slag droplets dispersedly fall into a coarse slag collecting tank 5 and a fine slag collecting tank 6 below under the influence of gravity, and are cooled and solidified into solid slag particles continuously by atomized water sprayed by an atomized water nozzle 16 arranged on a semicircular arch type tubular boiler component 18 in the falling process, the solid slag particles falling into the coarse slag collecting tank 5 and the fine slag collecting tank 6 heat purified water supplied by a purified water supply pipe 12 in the lower half part of a flat plate type waste heat boiler component 17 tightly attached to the periphery of the tank wall to about 60 ℃ in a heat conduction and heat radiation mode, and the hot water preheated to about 60 ℃ flows from the lower part of the flat plate type waste heat boiler component 17 to the upper part and is heated to about 80 ℃ after reaching the top; the steam flows out of the hot water conveying pipe 13 and enters a lower water inlet pipe of the semicircular arch type tubular boiler assembly 18 through a connecting pipeline, the entering hot water slowly rises, is continuously heated and heated, finally reaches the top of the semicircular arch type tubular boiler assembly 18, the water temperature reaches 100 ℃ and generates steam, the steam enters a steam bag 14 through the connecting pipeline for storage, and then is conveyed into a plant steam low-pressure pipe network through a steam conveying pipe 15 for uniform allocation and use.
Or the hot water flowing out of the hot water conveying pipe 13 is conveyed to a factory steam boiler room to be used as inlet water.
Or the hot water flowing out of the hot water delivery pipe 13 is delivered to the factory and employee bathroom to be directly used as hot water for bathing of the employees.
Solid coarse slag particles which fall into the coarse slag collecting pool 5, are cooled to normal temperature after thermal conversion is completed, a gate at the bottom of the coarse slag collecting pool is opened, the belt magnetic separator 8 is started, the solid slag particles are led out of the slag collecting pool under the action of self gravity and belt traction force, metal iron particles contained in the solid slag particles are separated on the belt magnetic separator 8, and the solid slag particles are returned to a converter of the factory for steelmaking; the slag particles after the metal iron particles are selected are conveyed into a granularity grading screening machine 9 and a packing machine 10, the slag particles are divided into products with different grain sizes, then the products are packed and bagged, and then the bagged products are respectively conveyed to users in different industries by a transport vehicle 11 for utilization.
The fine slag particles falling into the fine slag collecting tank 6 are cooled to normal temperature after heat conversion is completed, the gate at the bottom of the fine slag collecting tank is opened, the belt conveyor 8a is started, the solid slag particles are led out of the slag collecting tank under the action of self gravity and belt traction force, and the solid slag particles are directly conveyed to the packaging machine 10 for packaging and bagging without magnetic separation and screening because of low content of metal iron particles, and then are distributed and utilized by the transport vehicle 11.
Because the flat-plate type waste heat boiler assembly 17 and the semicircular arch type boiler assembly 18 heat energy recovery device which extend upwards from the two sides and the tail part of the slag collecting pool to form the enclosure are adopted, the space tightness of the surrounding space and the top space of the slag collecting pool is better under the premise of ensuring the air flow to be discharged, the high-speed air flow sprayed by the porous high-speed air nozzle 4 generates noise energy about 85dB, and finally the noise is reduced to about 60dB after the high-speed air flow is partially absorbed by the flat-plate type waste heat boiler assembly 17 and the semicircular arch type boiler assembly 18 which are water-cooled by the interlayer, so that the effect of reducing the noise of a working environment is achieved.
Compared with the prior art, the invention not only can realize the resourceful treatment of the high-temperature liquid steel slag and the high-efficiency recovery of the steel slag resource, but also can realize the recovery of the heat energy of the high-temperature liquid steel slag to produce steam and hot water for utilization.
Drawings
FIG. 1 is a schematic view of a method and apparatus for recycling high-temperature liquid steel slag and recovering heat energy;
the device comprises a slag receiving tank 1, a double-hook crane 2, a tundish 3, a porous high-speed air nozzle 4, a slag collecting pool 5, a fine dry granulated slag collecting pool 6, an air compressor 7, a belt magnetic separator 8, a particle size grading sieving machine 9, a packaging machine 10, a transport vehicle 11, a water supply pipe 12, a hot water conveying pipe 13, a steam ladle 14, a steam conveying pipe 15, an atomized water nozzle 16, a flat plate type waste heat boiler component 17 and a semicircular arch type pipe boiler component 18.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, the invention provides a method and a device for recycling and recovering heat energy of high temperature liquid steel slag, namely, when slag is discharged from a converter (or an electric furnace), the high temperature liquid steel slag is poured into a slag receiving tank 1 on a slag tank car under the furnace, the slag tank car is opened to a steel slag processing span, the slag receiving tank 1 is lifted to the front of a tundish 3 by a double-hook crane 2 and aligned with the central line of the tundish 3, a secondary hook of the crane is started, the slag receiving tank 1 is slowly tipped, the high temperature liquid steel slag is poured into the tundish 3, the high temperature liquid steel slag flows out from a launder and freely falls at the launder after the flow of the high temperature liquid steel slag is controlled by a water gap of the tundish 3, compressed air produced by an air compressor 7 and sent into a porous high-speed air nozzle 4 through a pipeline in the falling process, and the high temperature liquid steel slag is immediately granulated into liquid drops with the particle size of 0-5mm, the heat of the liquid steel slag is transferred to high-speed air flow in a convection heat transfer mode, so that the temperature of the air flow around the liquid steel slag is rapidly increased from normal temperature to about 1500 ℃, and meanwhile, the liquid steel slag drops directly transfer the heat to the flat plate type waste heat boiler component 17 in a heat radiation mode; in the process that the high-speed air flow heated to about 1500 ℃ moves in the horizontal direction, heat is directly transferred to the flat plate type waste heat boiler assembly 17 (the upper part and the extending part of the slag collecting tank) and the semi-circular arch type boiler assembly 18 in a convection heat transfer mode, and water flowing in the boiler assembly is heated until steam is generated.
After flying a certain distance in the horizontal direction along with high-speed air flow, the granulated high-temperature liquid steel slag droplets dispersedly fall into a coarse slag collecting tank 5 and a fine slag collecting tank 6 below under the influence of gravity, and are cooled and solidified into solid slag particles continuously by atomized water sprayed by an atomized water nozzle 16 arranged on a semicircular arch type tubular boiler component 18 in the falling process, the solid slag particles falling into the coarse slag collecting tank 5 and the fine slag collecting tank 6 heat purified water supplied by a purified water supply pipe 12 in the lower half part of a flat plate type waste heat boiler component 17 tightly attached to the periphery of the tank wall to about 60 ℃ in a heat conduction and heat radiation mode, and the hot water preheated to about 60 ℃ flows from the lower part of the flat plate type waste heat boiler component 17 to the upper part and is heated to about 80 ℃ after reaching the top; the steam flows out of the hot water conveying pipe 13 and enters a lower water inlet pipe of the semicircular arch type tubular boiler assembly 18 through a connecting pipeline, the entering hot water slowly rises, is continuously heated and heated, finally reaches the top of the semicircular arch type tubular boiler assembly 18, the water temperature reaches 100 ℃ and generates steam, the steam enters a steam bag 14 through the connecting pipeline for storage, and then is conveyed into a plant steam low-pressure pipe network through a steam conveying pipe 15 for uniform allocation and use.
Or the hot water flowing out of the hot water conveying pipe 13 is conveyed to a factory steam boiler room to be used as inlet water.
Or the hot water flowing out of the hot water delivery pipe 13 is delivered to the factory and employee bathroom to be directly used as hot water for bathing of the employees.
Solid coarse slag particles which fall into the coarse slag collecting pool 5, are cooled to normal temperature after thermal conversion is completed, a gate at the bottom of the coarse slag collecting pool is opened, the belt magnetic separator 8 is started, the solid slag particles are led out of the slag collecting pool under the action of self gravity and belt traction force, metal iron particles contained in the solid slag particles are separated on the belt magnetic separator 8, and the solid slag particles are returned to a converter of the factory for steelmaking; the slag particles after the metal iron particles are selected out are conveyed into a particle size grading sieving machine 9 and a packing machine 10, the granulated steel slag after magnetic separation is packed and bagged in a particle size grading way, the particle size fraction of 0-5mm is used for building materials, the particle size fraction of 0-3 mm is used for sintering raw materials, the particle size fraction of 1-3 mm is used for sand blasting grinding materials, the particle size fraction of 3-5 mm is used for sewage treatment filtering materials, and then the bagged products are respectively conveyed to users in different industries by a transport vehicle 11 for utilization.
The fine slag particles falling into the fine slag collecting pool 6 are cooled to normal temperature after thermal conversion is completed, a gate at the bottom of the fine slag collecting pool is opened, a belt conveyor 8a is started, the solid slag particles are led out of the slag collecting pool under the action of self gravity and belt traction force, the content of 0-1mm fine slag is low due to metal iron particles, magnetic separation and screening are not needed, the fine slag particles are directly conveyed to a packing machine 10 for packing and bagging, are used for polishing abrasive materials and wear-resistant fillers with higher utilization added values, and are distributed by a transport vehicle 11.
Because the flat-plate type waste heat boiler assembly 17 and the semicircular arch type boiler assembly 18 heat energy recovery device which extend upwards from the two sides and the tail part of the slag collecting pool to form the enclosure are adopted, the space tightness of the surrounding space and the top space of the slag collecting pool is better under the premise of ensuring the air flow to be discharged, the high-speed air flow sprayed by the porous high-speed air nozzle 4 generates noise energy about 85dB, and finally the noise is reduced to about 60dB after the high-speed air flow is partially absorbed by the flat-plate type waste heat boiler assembly 17 and the semicircular arch type boiler assembly 18 which are water-cooled by the interlayer, so that the effect of reducing the noise of a working environment is achieved.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (8)
1. A method for resourceful treatment and heat energy recovery of high-temperature liquid steel slag comprises the following steps: high-speed air flow sprayed out by the high-speed air nozzle (4) granulates high-temperature liquid steel slag flowing out of the tundish (3) at about 1600 ℃ in the air, and the granulated steel slag falls into a slag collecting pool for cooling; the high-speed air flow is heated by the liquid steel slag to about 1500 ℃, the temperature of the high-speed air flow is reduced to about 300 ℃ after the high-speed air flow is transmitted to the heat energy recovery part in the process of moving along the horizontal direction, and the high-speed air flow is discharged from the upper part of the tail part of the slag collecting pool; the method is characterized in that: the method not only can realize the resourceful treatment of the high-temperature liquid steel slag and the recovery of the steel slag resource, but also can realize the recovery of the heat energy of the high-temperature liquid steel slag and the production of steam and hot water for utilization.
2. The method of claim 1, wherein the method comprises the steps of: the slag collecting pool comprises a coarse slag collecting pool (5) and a fine slag collecting pool (6), and the heat energy recovery part comprises a flat plate type waste heat boiler component, a semi-circular arch type tubular boiler component and a steam bag.
3. The high-temperature liquid steel slag resourceful treatment and heat energy recovery device of claim 1, comprising a slag receiving tank (1), a double-hook crane (2), a tundish (3), a porous high-speed air nozzle (4), a coarse slag collecting tank (5), a fine slag collecting tank (6), an air compressor (7), a water supply pipe (12) and a hot water conveying pipe (13), and is characterized in that: the lower part of the coarse slag collecting pool (5) is funnel-shaped, and the outlet of the coarse slag collecting pool (5) is provided with a belt magnetic separator (8), a particle size grading screening machine (9) and a packing machine (10) for grading, packing and transporting slag particles; the lower part of the fine slag collecting tank (6) is funnel-shaped, and is provided with a belt conveyor (8 a) and a packer (10) for directly packing and transporting fine slag particles; be provided with flat waste heat boiler subassembly (17) and purified water delivery pipe (12) hugging closely coarse slag collecting pit (5) and thin sediment collecting pit (6) inner wall, flat waste heat boiler subassembly (17) side top sets up hot water conveying pipe (13), coarse slag collecting pit (5) and thin sediment collecting pit (6) both sides and afterbody upwards extend, set up semicircle arch form tubular boiler subassembly (18) at its top, set up a plurality of atomized water nozzles (16) on semicircle arch form tubular boiler subassembly (18) in succession, set up steam package (14) on semicircle arch form tubular boiler subassembly (18), steam conveying pipe (15).
4. The apparatus according to claim 3, wherein the apparatus comprises: the granularity grading sieving machine (9) is used for grading the granularity of the granulated steel slag after magnetic separation, the packing machine (10) is used for packing and bagging the sieved steel slag with different size grades, and the size grade of 0-5mm is used for building materials: the grain size of 0-3 mm is used for sintering raw materials; 1-3 mm size fraction is used for sand blasting abrasive; the grain size of 3-5 mm is used for filtering materials for sewage treatment.
5. The apparatus according to claim 3, wherein the apparatus comprises: the flat plate type waste heat boiler component (17) is a hollow water-through waste heat boiler component formed by welding a plurality of whole boiler steel plates with the thickness of 10 mm, and the waste heat boiler component is tightly attached to the inner wall of the periphery of the slag collecting and collecting pool; the purified water supply pipe (12) supplies purified water from the lower portion of the flat plate type waste heat boiler assembly (17) into the cavity of the assembly.
6. The apparatus according to claim 3, wherein the apparatus comprises: the semicircular arch type tubular boiler component (18) is formed by welding a plurality of seamless steel pipes for boilers into a semicircular arch; the steam bag (14) is used for storing steam generated by the semicircular arch type tubular boiler component (18); the steam conveying pipe (15) is used for conveying steam in the steam pocket (14).
7. The method for resource treatment and heat recovery of high-temperature liquid steel slag according to claim 1 is also suitable for resource treatment and heat recovery of high-temperature liquid alkaline ferroalloy smelting slag.
8. The apparatus according to claim 3, which is also suitable for recycling and recycling heat energy from high-temperature liquid steel slag.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110722.1A CN110643758A (en) | 2019-11-14 | 2019-11-14 | Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911110722.1A CN110643758A (en) | 2019-11-14 | 2019-11-14 | Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag |
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| CN201911110722.1A Pending CN110643758A (en) | 2019-11-14 | 2019-11-14 | Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111218533A (en) * | 2020-01-08 | 2020-06-02 | 西安建筑科技大学 | Steel slag recycling treatment method |
| CN111254241A (en) * | 2020-03-06 | 2020-06-09 | 一重集团大连工程技术有限公司 | Steel slag dry-type treatment equipment and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111218533A (en) * | 2020-01-08 | 2020-06-02 | 西安建筑科技大学 | Steel slag recycling treatment method |
| CN111254241A (en) * | 2020-03-06 | 2020-06-09 | 一重集团大连工程技术有限公司 | Steel slag dry-type treatment equipment and operation method thereof |
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