CN101775488B - Method for conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode - Google Patents
Method for conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode Download PDFInfo
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- CN101775488B CN101775488B CN2010101026693A CN201010102669A CN101775488B CN 101775488 B CN101775488 B CN 101775488B CN 2010101026693 A CN2010101026693 A CN 2010101026693A CN 201010102669 A CN201010102669 A CN 201010102669A CN 101775488 B CN101775488 B CN 101775488B
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Abstract
The invention belongs to the technical field of ferrous metallurgy, and relates to a method for conveying thermal-state rotary furnace metallized pellets in the anharmonic vibration mode. The invention is characterized in that metallized pellets from a spiral discharging machine of the rotary furnace go into a buffer bin through a charging chute; nitrogen gas or other inert gases are introduced into the buffer bin to isolate the air; the metallized pellets go into a continuous anharmonic vibration device from a discharging chute through the outlet of the buffer bin, and the anharmonic vibration device conveys the thermal-state rotary furnace metallized pellets; the metallized pellets are conveyed forward stepwise and are sent into an arc furnace through a feeding passage; and the invention is applicable to steel mills which annually produce 100-1000 thousand tons of rotary furnace metallized pellets and 100-2000 thousand tons of steel, wherein the ratio of the added metallized pellets to the steel is 1-100%. The invention has the advantage that the transportation process of the metallized pellets is synchronized with the production of the rotary furnace and the arc furnace, thereby effectively reducing the heat loss of the metallized pellets and indirectly lowering the power consumption of the arc furnace. Besides, the invention ensures the pressurization in the transportation process so as to isolate the air, effectively inhibits the reoxidation reaction, and avoids increasing the smelting burden of the arc furnace.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to a kind of processing method of the metallized pellet hot charging electric-arc furnace steelmaking of producing through rotary hearth furnace.
Background technology
In recent years the metallized pellet development of producing mainly contains three aspects: the 1. resource requirement of non-coke iron making; 2. seek the surrogate of steel scrap resource; 3. the development of direct-reduced iron production technology.
Rotary hearth furnace metallized pellet technology has high temperature reduction as a kind of technology of continuous production metallized pellet, continuous charging, the characteristics of continuous production metallized pellet.Yet at present, on the one hand, the metallized pellet of rotary hearth furnace production generally is stored in batch can after cooling, does not utilize the heat of the metallized pellet that comes out from the hot state of rotary hearth furnace, has wasted big energy; On the other hand, under the metallized pellet hot conditions, be exposed in the air, reoxidize ratio at least 20%.
Summary of the invention
The objective of the invention is to solve under the prerequisite that guarantees degree of metalization, how to utilize the problem of the heat of hot metallized pellet.
A kind of method of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode is characterized in that: the metallized pellet that comes out from the rotary hearth furnace spiral discharging machine enters the buffering feed bin by the charging chute; Feed nitrogen or other rare gas elementes from the gas atmosphere inlet of buffering feed bin, make the metallized pellet secluding air, Cang Gai, the storehouse shell inner surface of buffering feed bin are laid refractory materials, reduce the metallized pellet heat and scatter and disappear; Metallized pellet enters continuous disresonance vibrating device through the buffering bin outlet by discharging chute and carries hot rotary hearth furnace metallized pellet; Metallized pellet moves ahead to electric arc furnace direction stepped start-stop system, be promoted to highest point after, gravitate falls into the below feeding channel, arrives in the electric arc furnace; Transportation is by seal closure insulation and secluding air, and the cooling of control metallized pellet reoxidizes.Process control parameters is as follows:
(1) metallized pellet lift height 0-10m, fed distance 10-150m.
(2) the tapping temperature 1000-1500 of rotary hearth furnace metallized pellet ℃, adopt the insulation measure, the metallized pellet temperature that arrives electric arc furnace is not less than 700-1100 ℃, the metal pelletizing be shaped as ball, and oval ball etc., diameter is 10mm-50mm.
(3) metallized pellet transportation sealing control reoxidizes ratio 1-5%.
In the continuous charging process, the molten bath remains liquid state in the electric arc furnace stove; In smelting process, adjust control blowing oxygen quantity and spray carbon amount, forming good foamy slag, electric arc is enclosed in all the time in the foamy slag on molten steel of melting bath surface molten steel is implemented the submerged arc heating, and does not directly contact the solid metal pellet.
Be preheating to more than 600 ℃ differently from normal temperature with traditional steel scrap, the present invention is the insulation of high temperature pelletizing.
This technology adapts to rotary hearth furnace and produces ten thousand tons of metallized pellets of 10-100 per year, and produces the steel mill of 100,000 tons to 2,000,000 tons of steel.The ratio that the ton steel adds metallized pellet is 1-100%.
The equipment that matches and use with above-mentioned technology is seen shown in the accompanying drawing 1, comprising: 1 rotary hearth furnace, 2 charging chutes, 3 buffering feed bins, 4 discharging chutes, 5 device for continuously conveying, 6 feeding channels, 7 gas-tight sealings, 8 electric arc furnace.
Wherein:
Device for continuously conveying 5 as shown in Figure 3, mainly comprises: 16 seal closures, 17 delivery wheels, 18 transmission hoppers, 19 travelling belts, 20 stepping motors.0～10 ° of device for continuously conveying ramp angle, transmitting range 50～150m, transfer rate 0.02～1m/s; Device for continuously conveying is driven by stepping motor, and the travelling belt transmission drives the operation of transmission hopper; The level vibration constantly of transmission hopper is slowly advanced, and retreats fast; When the transmission hopper vibrated forward, metallized pellet was with transmission hopper synchronization action, and when the transmission hopper vibrated backward, metallized pellet then utilized its inertia effect to slide along transmission hopper surface, and moved to the electric arc furnace direction; Seal closure one end connects discharging chute, and the other end connects feeding channel, to guarantee the whole transportation secluding air of metallized pellet; The seal closure inner surface lays the refractory materials thermal insulation; The feeding channel tail end stretches in the stove by the electric arc furnace sidewall.
Advantage of the present invention is that metallized pellet transportation and rotary hearth furnace, electric arc furnace production are synchronous; Transportation equipment is simply effective; The transportation preservation and controlling can effectively reduce the metallized pellet heat and scatter and disappear, and reduces the electric arc furnace power consumption indirectly; Transportation sealing secluding air effectively suppresses to reoxidize the generation of reaction, avoids increasing the electric arc furnace smelting burden.
Description of drawings
Fig. 1 is a metallized pellet hot-loading and hot-conveying structural representation.Among the figure: 1 rotary hearth furnace, 2 charging chutes, 3 buffering feed bins, 4 discharging chutes, 5 device for continuously conveying, 6 feeding channels, 7 gas-tight sealings, 8 electric arc furnace.
Fig. 2 is buffering feed bin synoptic diagram.Among the figure: 9 Cang Gai, 10 storehouse shells, 11 warehouses, 12 shielding gas spouts, 13 feed bin LOAD CELLS, 14 bin outlets, 15 discharging chutes.
Fig. 3 is the device for continuously conveying synoptic diagram.Among the figure: 16 seal closures, 17 delivery wheels, 18 transmission hoppers, 19 travelling belts, 20 stepping motors.
Concrete implementation content
Embodiment 1: implementation content of the present invention is at producing 300000 tons of rotary hearth furnaces and 100t electric arc furnace per year.
The rotary hearth furnace metallized pellet is spherical, size 20mm, 1000 ℃ of tapping temperatures; The metallized pellet that comes out from the rotary hearth furnace spiral discharging machine enters the buffering feed bin of weight-carrying capacity 30t via the charging chute; 1000Nm is sentenced in the gas atmosphere inlet of buffering feed bin bottom
3The flow velocity of/h feeds nitrogen, guarantees to be in malleation in the stove, and pressure is greater than 0.1Mpa.Metallized pellet enters continuous disresonance vibrating device through the buffering bin outlet by discharging chute and carries hot rotary hearth furnace metallized pellet; The device for continuously conveying delivery head is 8m, transports apart from 100m travelling speed 0.1m/s; Metallized pellet is promoted to highest point and falls into feeding channel naturally, and then enters electric arc furnace.The metallized pellet temperature that arrives electric arc furnace is maintained about 1000 ℃ by 1000 ℃ of insulations, and time of delivery is 3-5min.The ratio that the ton steel adds metallized pellet is 50%.
Embodiment 2: implementation content of the present invention is at producing 600000 tons of rotary hearth furnaces and 150t electric arc furnace per year.
The rotary hearth furnace metallized pellet is spherical, size 25mm, 1300 ℃ of tapping temperatures; The metallized pellet that comes out from the rotary hearth furnace spiral discharging machine enters the buffering feed bin of weight-carrying capacity 50t via the charging chute; 1000Nm is sentenced in the gas atmosphere inlet of buffering feed bin bottom
3The flow velocity of/h feeds nitrogen, guarantees to be in malleation in the stove, and pressure is greater than 0.1Mpa.Metallized pellet enters continuous disresonance vibrating device through the buffering bin outlet by discharging chute and carries hot rotary hearth furnace metallized pellet; The device for continuously conveying delivery head is 4m, transports apart from 150m travelling speed 0.2m/s; Metallized pellet is promoted to highest point and falls into feeding channel naturally, and then enters electric arc furnace.The metallized pellet temperature that arrives electric arc furnace drops to 1100 ℃ by 1300 ℃, and time of delivery is 5-6min.The ratio that the ton steel adds metallized pellet is 40%.
Claims (6)
1. the method for a conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode, it is characterized in that: the metallized pellet that comes out from the rotary hearth furnace spiral discharging machine enters the buffering feed bin by the charging chute; Feed nitrogen or other rare gas element secluding airs in the buffering feed bin; Metallized pellet enters continuous disresonance vibrating device through the buffering bin outlet by discharging chute and carries hot rotary hearth furnace metallized pellet; The metallized pellet stepped start-stop system moves ahead, and arrives in the electric arc furnace via feeding channel; Adapt to rotary hearth furnace and produce ten thousand tons of metallized pellets of 10-100 per year, and produce the steel mill of 100,000 tons to 2,000,000 tons of steel, the ratio that the ton steel adds metallized pellet is 1-100%.
2. a kind of method of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode according to claim 1, it is characterized in that: the direct Continuous Heat of the metallized pellet that rotary hearth furnace is produced is delivered to electric arc furnace, delivery head 0-10m, fed distance 10-150m; This device for continuously conveying that is entered by discharging chute through bin outlet is to adopt mechanical stepping bed structure, can realize that speed change is reinforced, and transfer rate is controlled at 0.02～1m/s.
3. a kind of method of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode according to claim 1, it is characterized in that: the tapping temperature 1000-1500 of rotary hearth furnace metallized pellet ℃, the metallized pellet temperature that arrives electric arc furnace is 700-1100 ℃, the metal pelletizing be shaped as ball, and oval ball, diameter is 10mm-50mm.
4. the method for a kind of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode as claimed in claim 1 is characterized in that: carry the equipment of hot rotary hearth furnace metallized pellet to comprise rotary hearth furnace (1), charging chute (2), buffering feed bin (3), discharging chute (4), device for continuously conveying (5), feeding channel (6), gas-tight sealing (7), electric arc furnace (8); Buffering feed bin and charging chute, discharging chute are tightly connected; Charging chute tail end directly inserts buffering feed bin inside, and the discharging chute tail end directly inserts in the seal closure of device for continuously conveying; Feeding channel is positioned at the device for continuously conveying below, is used to accept metallized pellet and imports electric arc furnace.
5. the method for a kind of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode as claimed in claim 3 is characterized in that: cushion feed bin (3) and comprising: Cang Gai (9), storehouse shell (10), warehouse (11), shielding gas spout (12), feed bin LOAD CELLS (13), bin outlet (14), discharging chute (15); Buffering feed bin weight-carrying capacity 10～50t is used for the storage of metallized pellet in the non-reinforced time; Cang Gai and storehouse shell inner surface lay the refractory materials thermal insulation; The shielding gas medium is nitrogen or other rare gas element of preheating; When electric arc furnace was not reinforced, bin outlet was closed, and metallized pellet is temporary in the buffering feed bin, and when electric arc furnace restarted to feed in raw material, bin outlet was opened.
6. the method for a kind of conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode as claimed in claim 3, it is characterized in that: device for continuously conveying comprises: seal closure (16), delivery wheel (17), transmission hopper (18), travelling belt (19), stepping motor (20); Discharging chute and feeding channel stretch into seal closure inside, to guarantee the whole transportation secluding air of metallized pellet; The seal closure inner surface lays the refractory materials thermal insulation.
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| CN2010101026693A CN101775488B (en) | 2010-01-28 | 2010-01-28 | Method for conveying thermal-state rotary furnace metallized pellets in anharmonic vibration mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103194560B (en) * | 2012-01-10 | 2015-05-06 | 攀钢集团研究院有限公司 | Transmission method of metallized pellet |
| CN103333979B (en) * | 2013-03-19 | 2015-10-28 | 陈存运 | Electricity coal method molten point reduction iron production system and technical process thereof |
| 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 |
| CN103482265B (en) * | 2013-09-24 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method preventing hot metal pellet to be oxidized in batch can |
| CN105115296A (en) * | 2015-09-08 | 2015-12-02 | 泰州市恒达金属铸件厂 | Industrial electric-arc furnace |
| CN107557511A (en) * | 2017-08-30 | 2018-01-09 | 武汉钢铁有限公司 | Thin Strip Steel productive technology of short flow based on DRI |
| CN109945661A (en) * | 2019-03-25 | 2019-06-28 | 河南全顺振动设备有限公司 | A kind of alloy material pre-heating system and method for steel-making |
| CN115125359B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method and system for steelmaking by hot charging and hot feeding of metallized pellets of rotary hearth furnace |
| CN114394441A (en) * | 2022-01-26 | 2022-04-26 | 连云港石化有限公司 | Automatic feeding device for rod-shaped metal sodium catalyst |
| CN114739185A (en) * | 2022-03-22 | 2022-07-12 | 首钢京唐钢铁联合有限责任公司 | Distribution system of sleeve kiln, distribution control method and related equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2210195Y (en) * | 1994-09-14 | 1995-10-18 | 冶金工业部钢铁研究总院 | Means for loading into the fineral reduction furnace of melting reduction pig-iron making method |
| CN201187944Y (en) * | 2007-11-13 | 2009-01-28 | 四川龙蟒集团有限责任公司 | Conveying device of high temperature direct reduced iron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2210195Y (en) * | 1994-09-14 | 1995-10-18 | 冶金工业部钢铁研究总院 | Means for loading into the fineral reduction furnace of melting reduction pig-iron making method |
| CN201187944Y (en) * | 2007-11-13 | 2009-01-28 | 四川龙蟒集团有限责任公司 | Conveying device of high temperature direct reduced iron |
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