CN101565769B - Electric furnace sponge iron hot charging device and method thereof - Google Patents
Electric furnace sponge iron hot charging device and method thereof Download PDFInfo
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- CN101565769B CN101565769B CN2009100852636A CN200910085263A CN101565769B CN 101565769 B CN101565769 B CN 101565769B CN 2009100852636 A CN2009100852636 A CN 2009100852636A CN 200910085263 A CN200910085263 A CN 200910085263A CN 101565769 B CN101565769 B CN 101565769B
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Abstract
The invention discloses an electric furnace sponge iron hot charging device and a method thereof, pertaining to the technical field of sponge iron hot charging. The device comprises a transitional material tank, a distributor, a fixed slide pipe, a hot charging revolving slide pipe, nitrogen sealing devices, a nitrogen cooling system and a receiving slide pipe; the fixed slide pipe is arranged below the distributor, and the hot charging revolving slide pipe is arranged below the fixed slide pipe; a common slide pipe is arranged on the hot charging revolving slide pipe, and the common slide pipe and the hot charging revolving slide pipe are both fixed on a same revolving support and converged into one slide pipe at the ends of the two slide pipes, thus forming a blanking slide pipe similar to a three-way pipe; the receiving slide pipe is fixed on a furnace cover; a first nitrogen sealing device is arranged between the fixed slide pipe and the hot charging revolving slide pipe; and a second nitrogen sealing device is arranged between the hot charging revolving slide pipe and the fixed receiving slide pipe on the furnace cover. The electric furnace sponge iron hot charging device is suitable for producing sponge iron by adopting a gas-based shaft furnace process (MIDREX) or other methods so as to hot charge the electric furnace later; and the device does not need external force except the revolving mechanism, and realizes continuous charging by self-gravity of the materials.
Description
Technical field
The invention belongs to the sponge iron hot charging technical field, a kind of electric furnace sponge iron hot charging device and method thereof particularly are provided.
Background technology
Sponge iron (DRI) is that iron ore directly reduces under solid conditions and forms, and can be used as the pure raw material of smelting high-quality steel, special steel, thereby can replace steel scrap to carry out Electric furnace steel making.In recent years, because steel scrap shortage of resources, and the maturation of sponge iron production technology is used, the output of sponge iron is with annual speed increase more than 10%, adopt cold sponge iron quite general abroad as the technology that raw material carries out Electric furnace steel making, but adopt gas base MIDREX shaft furnace method or other rotary kiln methods to produce thermal sponge iron about 600 ℃, under the deadweight effect, directly slip into the technology that electric furnace makes steel by the elephant trunk feed way then and also be not used in the world at present.
Ore is after finishing reduction process, and sponge iron temperature very high (greater than 600 ℃) is consequently sent into from direct reduction production unit when sponge iron and is very easy to occur the secondary oxidation problem the steelshop process.How to develop a kind of new sponge iron delivery system, make thermal sponge iron under the condition of sealing, carry, thereby it is itself and ambient air is isolated, simultaneously also avoid discharging a large amount of stove dirt, but also require this delivery system and arc furnace equipment not to interfere with each other in operation, this is present Steel Plant urgent problems, also is that Electric furnace steel making factory does not adopt the one of the main reasons of sponge iron hot charging technology in recent ten years.First cover adopts the MIDREX shaft furnace to produce sponge iron, then to the thermal sponge iron charging system of the contiguous continuous hot delivery and hot charging of electric steel plant, at present just in the construction of Oman one tame Iron And Steel Company, and this Electric furnace steel making engineering is contracted overall budget by the Beijing Shougang International Engineering Technology Co., Ltd in the EPS mode.
Carry out Electric furnace steel making with cold sponge iron as the alternative materials of steel scrap, compare as raw material with steel scrap, indexs such as energy consumption still are higher, if but adopt thermal sponge iron as the Electric furnace steel making raw material, because 600 ℃ sponge iron itself has been brought certain physical heat into to electric furnace, thereby greatly reduce the power consumption and the tap to tap time of Electric furnace steel making, electric power consumption per ton steel reduces about 150kwh, with an Electric furnace steel making factory that produces 1000000 tons per year is example, can save electricity 1.5 hundred million kwh every year, if calculate with 0.5 yuan/kwh of electricity price, annual cost-saved 0.75 hundred million yuan, profit is considerable, and after adopting sponge iron direct hot charging electric furnace, also can reduce being used for the operation of cooling heat sponge iron concerning the sponge iron production plant, these can save a large number of expense equally.
Summary of the invention
The object of the present invention is to provide a kind of electric furnace sponge iron hot charging device and method thereof, adopt 100% thermal sponge iron (greater than 600 ℃) to carry out the mass transport technology and the device thereof of Electric furnace steel making, be best suited for and adopt gas-based shaft kiln MIDREX method to produce sponge iron hot charging electric furnace and the Electric furnace steel making factory that smelts then, also be suitable for alternate manner and produce sponge iron hot charging electric furnace and the Electric furnace steel making factory that smelts then.
The present invention includes transition batch can, divider, fixedly elephant trunk, hot charging rotation elephant trunk, nitrogen gas seal equipment, nitrogen cooling system, material feeding elephant trunk, common elephant trunk and rotation support, wherein, transition batch can, divider and fixedly this three of elephant trunk arrange successively and link together along the materials flow direction in the flange mode, hot charging rotation elephant trunk and material feeding elephant trunk are arranged thereunder successively, but the physical connection relation does not take place in they and above-mentioned three, only has the continuous relationship of materials flow.Because hot charging rotation elephant trunk is rotatable, thus it and the fixedly elephant trunk above it with and following material feeding elephant trunk between have the slit, this two place is welded with nitrogen gas seal equipment 5 and 7 respectively; The nitrogen cooling system then is meant by perforate on the skin of the fixing bilayer sleeve of elephant trunk and feeds nitrogen and comes a kind of facility of refrigerative; Fixedly elephant trunk enters into inside, workshop outside electric furnace shop, is fixed by suspension bracket on platform and the crane girder or support respectively; Also be furnished with a common elephant trunk on the hot charging rotation elephant trunk, be used to satisfy the adding needs of flux such as lime and iron alloy; Hot charging rotation elephant trunk and common elephant trunk all are fixed on same rotation and support, and gathering at the end of two elephant trunks is an elephant trunk, forms the emission of baiting chute that is similar to threeway; The material feeding elephant trunk is fixed on the bell, is used to receive diffusing shape material flux such as lime that thermal sponge iron and electrosmelting use, rhombspar.
Fixedly elephant trunk adopts double-layer sleeve structure.In the arranged beneath of fixing elephant trunk hot charging rotation elephant trunk.The maximum angle of rotation of hot charging rotation elephant trunk is 80 °, and the operating angle of hot charging rotation elephant trunk mainly contains 3, promptly 0 °, 40 ° and 80 °.First nitrogen gas seal equipment is fixedly between elephant trunk and the hot charging rotation elephant trunk.Second nitrogen gas seal equipment on hot charging rotation elephant trunk and bell fixedly between the material receiving pipe.
The nitrogen cooling system is divided into two portions, first part is a top elephant trunk cooling system, and cooling is from divider to fixing each section restrained line between the elephant trunk end, and second section is that hot charging rotates the elephant trunk cooling system, cooling hot charging rotation elephant trunk, nitrogen pipeline can rotate elephant trunk with hot charging and rotate.The nitrogen of cooling usefulness enters between the internal and external casing from the air inlet port on the outer layer sleeve of each section elephant trunk.
The method of electric furnace sponge iron hot charging of the present invention is: thermal sponge iron enters the fixedly elephant trunk of double-layer sleeve structure from transition batch can and divider; Thermal sponge iron enters the hot charging rotation elephant trunk of double-layer sleeve structure from fixing elephant trunk under the protection of first nitrogen gas seal equipment; Thermal sponge iron enters the material feeding elephant trunk from hot charging rotation elephant trunk under the protection of second nitrogen gas seal equipment; The heat-eliminating medium of all bilayer sleeves is nitrogen or other rare gas elementes; The sealing medium of all tightness systems is nitrogen or other rare gas elementes.
The effect of transition batch can and divider mainly is the flow direction of regulating electric furnace thermal sponge iron in the non-reinforced time when maintenance or in smelting cycle, and regulates feed rate in the reinforced process.The thermal sponge iron more than 600 ℃ by the production of MIDREX shaft furnace enters the transition batch can, smelting cycle with electric furnace is that 55min is an example, the continuous charging time of hot charging sponge iron is 45min, in all the other non-reinforced times of 10 minutes, thermal sponge iron need be changed through the commutation function of divider and flow in another root elephant trunk, changes the hot wafering operation over to.Need the sponge iron of 600 ℃ of addings continuously in the electrosmelting process, the continuous charging time is 45min.
The present invention does not need external impetus except that rotating mechanism, realize the continuous conveying of material fully by the own wt of material, save electric furnace charging electric energy and other equipment (as jumbo batch can and weighing device), and adopt the hot charging continuous steelmaking of sponge iron, the operations such as opening operation of bell when having avoided from top filling, can save 10% operating time (5-10min), reduce scattering and disappearing of the electric furnace capacity of furnace again.This processing method and device have good application prospects in the Electric furnace steel making field.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.Wherein, transition batch can 1, divider 2, fixedly elephant trunk 3, hot charging rotation elephant trunk 4, first nitrogen gas seal equipment 5, nitrogen cooling system 6, second nitrogen gas seal equipment 7, material feeding elephant trunk 8, electric furnace 9, crownblock beam 10, common elephant trunk 11, rotation support 12.
Embodiment
This device comprises transition batch can, divider, fixedly elephant trunk, hot charging rotate elephant trunk, nitrogen gas seal equipment, nitrogen cooling system, material feeding elephant trunk.Fixedly elephant trunk 3 is positioned at divider 2 belows, directly enters in the electric furnace shop, fix by suspension bracket on platform and the crane girder or support respectively, in the arranged beneath of fixing elephant trunk 3 hot charging rotation elephant trunk 4; Also be furnished with a common elephant trunk 11 on the hot charging rotation elephant trunk 4, be used to satisfy the adding needs of flux such as lime and iron alloy; Hot charging rotation elephant trunk 4 and common elephant trunk 11 all are fixed on same rotation and support on 12, and gathering at the end of two elephant trunks is an elephant trunk, forms the emission of baiting chute that is similar to threeway; Material feeding elephant trunk 8 is fixed on the bell, is used to receive diffusing shape material flux such as lime that thermal sponge iron and electrosmelting use, rhombspar; First nitrogen gas seal equipment 5 is fixedly between elephant trunk 3 and the hot charging rotation elephant trunk 4.Second nitrogen gas seal equipment 7 is between the fixedly material feeding elephant trunk 8 on hot charging rotation elephant trunk 4 and the bell.
Fixedly elephant trunk is positioned at the divider below, directly enter in the electric furnace shop, fix by suspension bracket on platform and the crane girder or support respectively, this is elephant trunk employing double-layer sleeve structure fixedly, purpose of doing like this and reason mainly are based on following consideration: first, the cooling inner layer sleeve, because the temperature of sponge iron is more than 600 ℃, fixedly elephant trunk is being carried in the process of this elevated temperature heat sponge iron continuously, physical and chemical index such as abrasive wear resistance and rigidity all descends significantly, mode by inflated with nitrogen in bilayer sleeve can play the effect of cooled interior sleeve pipe, thereby keeps the physicochemical property of inner elephant trunk; The second, the inner inflated with nitrogen of double-layer sleeve structure can play and prevent that sponge iron from contacting with air, thereby prevents the purpose of sponge iron secondary oxidation.
Electric furnace smelt and maintenance process in, be to guarantee furnace operation and reinforced elephant trunk mutually noninterfere, in the arranged beneath of fixing elephant trunk hot charging rotate elephant trunk.The maximum angle of rotation of hot charging rotation elephant trunk is 80 °, the operating angle of hot charging rotation elephant trunk mainly contains 3, promptly 0 °, 40 ° and 80 °, hot charging rotation elephant trunk is operated in 0 ° when electric furnace needs continuous charging in smelting process, when electric furnace is slagged tap and tap, electric furnace needs forward, fascinates backward, and hot charging rotation this moment elephant trunk rotates 40 ° to stokehold slag door direction, thereby has avoided hot charging rotation elephant trunk and be fixed on the possibility that the material receiving pipe on the furnace lid bumps; When electric furnace need overhaul, need mechanic position to be arrived in the electric stove integral handling with the crane in the workshop, hot charging rotation this moment elephant trunk angle of rotation is 80 °, thereby does not influence the handling of electric furnace.Because electric furnace not only has only sponge iron in process of production, also need a large amount of flux and iron alloys such as lime, therefore on this hot charging rotation elephant trunk, also be furnished with a common elephant trunk, be used to satisfy the adding needs of flux such as lime and iron alloy.Hot charging rotation elephant trunk and common elephant trunk all are fixed on same rotation and support, and gathering at the end of two elephant trunks is an elephant trunk, forms the emission of baiting chute that is similar to threeway.
Material feeding elephant trunk on the furnace lid is fixed on the bell, is used to receive diffusing shape material flux such as lime that thermal sponge iron and electrosmelting use, rhombspar.Because high-temperature flue-gas herein is too high, this elephant trunk adopts water-cooling pattern to cool off, and water coolant draws from the bell cooling water system.Characteristics that adopt sponge iron to carry out Electric furnace steel making are that the big boiling in molten bath takes place easily, big splash, the major cause that produces is that the sponge iron that adds is not able to do in time fusing and has produced heap, in case bath temperature raises or the variation of critical dynamic condition, will cause acutely carrying out of reaction between carbon and oxygen, big boiling takes place, big splash, even even more serious accident.For fear of this thing happens, need to guarantee that sponge iron can join the central zone (i.e. the central position of 3 electrodes) of electric furnace, make the sponge iron of continuous adding add fusing of marginization in the limit, do not produce the heap phenomenon, material feeding elephant trunk on the bell is arranged in the central section port lid scope on the furnace lid for this reason, and to 24 ° of electric furnace center position inclinations, the blanking arc trajectory according to calculating material has guaranteed that sponge iron is added to the central section of electric furnace.
First nitrogen gas seal equipment is fixedly between elephant trunk and the hot charging rotation elephant trunk.Because the top hydraucone of the rotating operation of hot charging rotation elephant trunk, the distortion of elephant trunk and hot charging rotation elephant trunk is than factors such as the end opening of top fixedly elephant trunk are big, the gap fixedly must be left between the elephant trunk in hot charging rotation elephant trunk and top, 600 ℃ thermal sponge iron enters into the process of hot charging rotation elephant trunk from fixing elephant trunk, for preventing the secondary oxidation of air to sponge iron, spy place, crack during this time is provided with first nitrogen gas seal equipment, and the direction of nitrogen gas stream is oblique elephant trunk centerline direction.
Second nitrogen gas seal equipment on hot charging rotation elephant trunk and bell fixedly between the material receiving pipe.Principle is with first nitrogen gas seal equipment.The nitrogen gas stream direction of this nitrogen gas seal equipment is to blow to electric furnace inside under oblique, and this air flow line has not only played the effect that prevents the sponge iron secondary oxidation, has also suppressed excessive from electric furnace material feeding elephant trunk of flue gas in the electric furnace.
The nitrogen cooling system mainly is the ectonexine sleeve pipe that is used to cool off reinforced elephant trunk, has guaranteed the rigidity of outer layer sleeve and the abrasive wear resistance of inner layer sleeve.This nitrogen cooling system is divided into two portions, first part is a top elephant trunk cooling system, and cooling is from divider to fixing each section restrained line between the elephant trunk end, and second section is that hot charging rotates the elephant trunk cooling system, cooling hot charging rotation elephant trunk, nitrogen pipeline can rotate elephant trunk with hot charging and rotate.The nitrogen of cooling usefulness enters between the internal and external casing from the air inlet port on the outer layer sleeve of each section elephant trunk.
Claims (7)
1. the device of an electric furnace sponge iron hot charging, it is characterized in that, this device comprises transition batch can (1), divider (2), fixing elephant trunk (3), hot charging rotation elephant trunk (4), nitrogen gas seal equipment (5 and 7), nitrogen cooling system (6), material feeding elephant trunk (8), (12) are supported in common elephant trunk (11) and rotation, wherein, transition batch can (1), divider (2) and fixing this three of elephant trunk (3) arrange successively and link together in the flange mode along the materials flow direction, hot charging rotation elephant trunk (4) and material feeding elephant trunk (8) are arranged thereunder successively, but the physical connection relation does not take place in they and above-mentioned three, only has the continuous relationship of materials flow; Hot charging rotation elephant trunk (4) and the fixedly elephant trunk (3) above it with and following material feeding elephant trunk (8) between have the slit, this two place is welded with nitrogen gas seal equipment (5,7) respectively; Fixedly elephant trunk (3) enters into inside, workshop outside electric furnace shop, is fixed by suspension bracket on platform and the crane girder or support respectively; Also be furnished with a common elephant trunk (11) on the hot charging rotation elephant trunk (4), be used to satisfy the adding needs of lime flux and iron alloy; Hot charging rotation elephant trunk (4) and common elephant trunk (11) all are fixed on same rotation and support on (12), and gathering at the end of two elephant trunks is an elephant trunk, the emission of baiting chute of formation threeway; Material feeding elephant trunk (8) is arranged in the central section port lid scope on the furnace lid, and tilts 24 ° to the electric furnace center position, is used to receive lime, rhombspar that thermal sponge iron and electrosmelting the use shape material flux that looses; Fixedly elephant trunk (3) adopts double-layer sleeve structure, and hot charging rotation elephant trunk (4) is a double-layer sleeve structure; Material feeding elephant trunk (8) adopts water-cooling pattern to cool off; Nitrogen cooling system (6) is divided into two portions, and first part is a top elephant trunk cooling system, and cooling is from divider to fixing each section restrained line between the elephant trunk end; Second section is a hot charging rotation elephant trunk cooling system, and cooling hot charging rotation elephant trunk, nitrogen pipeline can rotate elephant trunk with hot charging and rotate, and the nitrogen of cooling usefulness enters between the internal and external casing from the air inlet port on the outer layer sleeve of each section elephant trunk; The direction of the first nitrogen gas seal equipment nitrogen gas stream is oblique elephant trunk centerline direction, and the nitrogen gas stream direction of second nitrogen gas seal equipment is to blow to electric furnace inside under oblique; First nitrogen gas seal equipment between fixedly elephant trunk and hot charging rotation elephant trunk, second nitrogen gas seal equipment on hot charging rotation elephant trunk and bell fixedly between the material receiving pipe.
2. according to the described device of claim 1, it is characterized in that the maximum angle of rotation of hot charging rotation elephant trunk (4) is 80 °, the operating angle of hot charging rotation elephant trunk (4) has 3, promptly 0 °, 40 ° and 80 °.
3. according to the described device of claim 1, it is characterized in that hot charging rotation elephant trunk (4) is a three-port structure.
4. method that adopts the described device electric furnace sponge iron hot charging of claim 1, thermal sponge iron enters the fixedly elephant trunk (3) of double-layer sleeve structure from transition batch can (1) and divider (2); Thermal sponge iron enters the hot charging rotation elephant trunk (4) of double-layer sleeve structure from fixing elephant trunk (3) under the protection of first nitrogen gas seal equipment (5); Thermal sponge iron enters the material feeding elephant trunk (8) of water-cooled from hot charging rotation elephant trunk (4) under the protection of second nitrogen gas seal equipment (7); The heat-eliminating medium of all bilayer sleeves is a nitrogen; The sealing medium of all tightness systems is a nitrogen.
5. in accordance with the method for claim 4, it is characterized in that fixedly elephant trunk (3) adopts double-layer sleeve structure and inflated with nitrogen cooling, the interlayer inflation of bilayer sleeve is played simultaneously and is prevented possible the contacting of sponge iron and air, thereby prevents the sponge iron secondary oxidation.
6. in accordance with the method for claim 4, it is characterized in that material feeding elephant trunk (8) adopts the water-cooling pattern cooling and the center port of being installed in to cover.
7. in accordance with the method for claim 4, it is characterized in that, thereby nitrogen gas seal equipment adopts circumferential weld or annular distance nitrogen-blow mode to produce the purpose that air curtain reaches sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100852636A CN101565769B (en) | 2009-06-03 | 2009-06-03 | Electric furnace sponge iron hot charging device and method thereof |
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| CN2009100852636A CN101565769B (en) | 2009-06-03 | 2009-06-03 | Electric furnace sponge iron hot charging device and method thereof |
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| CN101565769A CN101565769A (en) | 2009-10-28 |
| CN101565769B true CN101565769B (en) | 2010-09-15 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103266194A (en) * | 2013-04-25 | 2013-08-28 | 中冶赛迪工程技术股份有限公司 | Shaft furnace-electric arc furnace direct reduced iron continuous hot-feeding device and feeding control method |
| CN103627836B (en) * | 2013-12-20 | 2015-09-09 | 中冶赛迪工程技术股份有限公司 | A kind of steel-smelting device and method |
| CN103805727B (en) * | 2014-02-26 | 2015-12-02 | 北京首钢国际工程技术有限公司 | A kind of method adopting bucket machine hot charging direct-reduced iron |
| CN108642226A (en) * | 2018-05-28 | 2018-10-12 | 中冶南方工程技术有限公司 | Electric furnace duplex smelts sponge iron process for extracting vanadium |
| CN108842032B (en) * | 2018-09-14 | 2023-09-29 | 辽宁科技大学 | Device and method for reduction treatment of scrap steel |
| DE102020205493A1 (en) * | 2020-04-30 | 2021-11-04 | Sms Group Gmbh | Process for making liquid pig iron from a DRI product |
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