CN104263877B - In process the converter of high phosphorus hot metal dust, air blowing composite spray gun and using method - Google Patents
In process the converter of high phosphorus hot metal dust, air blowing composite spray gun and using method Download PDFInfo
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Abstract
In process the converter of high phosphorus hot metal dust, air blowing composite spray gun and a using method, belong to steelmaking technical field.Described spray gun be applicable to combined blown converter smelt in high phosphorus hot metal, described multifunction spray gun design comprise adopt the dusting of the Bearing score pipe of single hole design, blow combining nozzle and special swings that realize the spray gun body of a gun design.Described spray gun is by the shower nozzle simplified design of single hole Bearing score pipe, oxygen blast, nitrogen oxygen are switched, the multifunctional unit such as to dust is applied to composite spray gun, by the particular design of spray gun tail swing device, the freedom of spray gun stream stock in the certain area of molten bath or active roll when can realize blowing, thus overcome former single hole spray gun to molten bath impact area Relatively centralized, being unfavorable for slag and the shortcoming easily producing splash, air dispersion is blown into molten bath, expand the area coverage of jet-impingement, the stirring in even molten bath.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to that the converter of high phosphorus hot metal in a kind of process is dusted, air blowing composite spray gun and using method.
Background technology
Along with iron and steel enterprise is increasingly strong to the wish reducing production cost, be the optimal selection reduced costs at Iron-smelting with addition of low price high-phosphorus iron ore.With addition of the iron ore of high phosphorus in blast furnace, converter enters stove molten iron phosphorus content and reaches about 0.2%, even higher.Converter routine is smelted, converter current blowing is more suitable for the molten iron that smelting phosphorus content is less than less than 0.15%, for the molten iron that smelting phosphorus content is greater than 0.2%, mean the dephosphorization rate that will improve convertor steelmaking process further, to meet the requirement of finished product molten steel phosphorus content inlet wire.According to previous experiences, increase in the process of bessemerizing function of dusting can realize in the smelting of high phosphorus hot metal.But the converter of current most of steel mills does not have dusting device, under the existing oxygen gun system of steel mill, how to realize the multifunction of top blow oxygen lance, be one of difficult problem that in converter process, high phosphorus hot metal technique faces.
The apparatus of oxygen supply that converter adopts mainly can realize the top blow oxygen lance that oxygen pressure can be converted to the band supersonic speed shower nozzle of kinetic energy, all adopts the sprinkler design of porous Bearing score pipe at present.The source of the gas adopted is oxygen.In order to high phosphorus hot metal dephosphorization in realizing, need the device dusted in the increase of Converter Oxigen Blowing system.University of Science & Technology, Beijing's (patent: the converter steel making method and the supersonic speed oxygen rifle that adopt supersonic speed oxygen lance spraying powder dephosphorization, application number: the dusting device 201210123055.2) proposed is connected with oxygen gun body powder inlet by powder spraying apparatus meal outlet by abrasion-proof ceramic hose, other oxygen rifle design is identical with conventional oxygen rifle.The shortcoming of this design is owing to adopting porous nozzle, easily producing choked flow in throat location, and the erosion accelerating oxygen rifle aditus laryngis position and the resistance increasing pulvis are damaged, and reduce the life-span of efficiency and the spray gun dusted; In addition, owing to needing the passage increasing winding-up lime powder on porous nozzle, nozzle structure is more complicated, and manufacture difficulty strengthens.Jinchuan Group Co., Ltd's (patent: a kind of metallurgical combined type spray gun, application number: the metallurgical combined type spray gun 201220155429.4) designed, be suitable for the smelting of copper, for the melting bath stirring of converter height jet, this spray gun is difficult to adapt to, therefore, design a kind of applicable converter smelting high phosphorus can dust and can oxygen blown composite spray gun be very important for the industrializing implementation that middle high phosphorus hot metal is smelted.
Summary of the invention
The object of the present invention is to provide that the converter of high phosphorus hot metal in a kind of process is dusted, air blowing composite spray gun and using method, described spray gun be applicable to combined blown converter smelt in high phosphorus hot metal, the functions such as (or limestone powder, iron scales) that namely has that oxygen and nitrogen blow in the mixing of converter Top portion, Top blows and sprays lime powder.The object of the invention is spray gun oxygen blast, the mixing of nitrogen oxygen blown, Top blows and sprays agent and can realize the function i ntegration such as balanced melting bath stirring effect on spray gun, with realize combined blown converter efficient, economical for middle and high phosphorus molten iron-steelmaking.
Multifunction spray gun of the present invention is consistent with the oxygen rifle one-piece construction that steelworks uses, and is namely made up of the body of a gun and shower nozzle.The body of a gun is made up of four layers of sleeve pipe, and the sleeve pipe at center passes into lime powder and nitrogen or oxygen, and sleeve pipe adjacent with it passes into oxygen, and two remaining sleeve pipes pass into water, as heat-eliminating medium.Inner side is water-in, and outside is water outlet, can reduce the temperature of the spray gun body of a gun.The rifle head of spray gun adopts the design of single hole Bearing score pipe.Connected by welding process between the body of a gun and rifle head.The logical gas fraction of rifle head part is consistent with water cooling part with body of a gun part.There are import and the outlet of water coolant.The passage of ventilation body and lime powder is an entirety, and gas and lime powder mix at inner chamber, enter the structure of Bearing score pipe afterwards, forms air-flow at a high speed and is sprayed by lance outlet.
Multifunction spray gun design of the present invention has following features compared with traditional oxygen rifle or spray gun:
(1) what the Bearing score pipe of employing single hole designed dusts, (oxygen, nitrogen) combining nozzle of blowing
Adopting the nozzle of the dusting of unique Bearing score pipe design, oxygen blast gas and nitrogen, is water coolant outside spray orifice.Single hole Bearing score pipe nozzle is divided into two sections, contraction section and expansion segment, and Mach number is according to 1.5 ~ 2.2 designs, and schematic diagram as depicted in figs. 1 and 2.Middle pipe passes into oxygen, and interior pipe is the passage of winding-up lime powder (or limestone powder, iron scale) and carrier gas nitrogen.
(2) the swing design of the spray gun body of a gun
When using single hole Bearing score pipe nozzle, oxygen jet is strong to the impact capacity in molten bath, but shortcoming to be impact area little, can causing slag speed slowly, splash is large.In order to overcome this shortcoming, the present invention designs spray gun and install tilting mechanism on the correct position of cross traveling trolley, sees Fig. 3, thus when realizing blowing, top-blown spray gun rifle position freely swings or active roll action in 0.5 ~ 2.5m.The shortcoming of single hole spray gun can be overcome like this, top-blown spray gun spout does with swing diameter and molten bath diameter ratio and swings or directional swing action at random above molten bath in 0 ~ 0.5 scope, realizing the penetration depth that the larger single hole stream stock of surging force and molten bath upper surface formed is 0.4 ~ 0.6 with the ratio of pool depth, evenly strengthening melt tank reaction dynamic conditions.Simultaneously, the high temperature damage phenomenon that the ultrahigh-temperature region produced when impacting molten bath for suppressing Oxygen Flow stock may be caused the resistance to material of converter lining, oxygen rifle body of a gun pendulum angle is very important controling parameters, must ensure that the impact area of Oxygen Flow stock to molten bath remains on impact diameter and molten bath area ratio is in the scope of 0.1 ~ 0.25.
Of the present inventionly to dust, the composite spray gun of oxygen blast gas and nitrogen is used in high phosphorus hot metal in smelting, its using method can adopt permanent rifle bit manipulation or become rifle bit manipulation when being blowing, according to the processing requirement of blowing different times, oxygen flow can make the appropriate adjustments, and (air supply intensity is 2.0 ~ 4.5Nm
3/ t.min).Novel spray gun also can according to the requirement of technique, switching or the nitrogen/oxygen mixed injection of oxygen and nitrogen can be carried out in converting process, switching time is blowing 3 ~ 5min, is completed by the sequence of control of operator's console, to reach the net effect controlling suitable bath temperature and ensure stirring intensity of molten pool; Meanwhile, function of dusting is possessed.The flow that dusts is 20-600kg/min, and pressure is 0.5 ~ 1.6Mpa.
Compared with additive method, tool of the present invention has the following advantages:
(1) by the design of single hole Bearing score pipe, oxygen blast, nitrogen oxygen are switched, the function such as to dust combines in composite spray gun, and the single hole spray gun Oxygen Flow stock advantage large to molten bath surging force is kept, be beneficial to giving full play to melting bath stirring effect, also spray head designs can be made to simplify, meanwhile, also possess function of dusting, this is other unifunctional oxygen rifles, the spray gun that dusts is difficult to realize, thus becomes the indispensability equipment of high phosphorus hot metal in converter process;
(2) by the particular design of spray gun tail swing device, the freedom of spray gun stream stock in the certain area of molten bath or active roll when can realize blowing, thus overcome former single hole spray gun to molten bath impact area Relatively centralized, being unfavorable for slag and the shortcoming easily producing splash, air dispersion is blown into molten bath, expand the area coverage of jet-impingement, the stirring in even molten bath.
Accompanying drawing explanation
Fig. 1 is the structural representation of the body of a gun of spray gun of the present invention.
Fig. 2 is burner nozzle constructed schematic diagram of the present invention.
Fig. 3 is the swing schematic diagram of spray gun of the present invention.
Embodiment
Be used for 500kg level converter heat simulation furnace for the composite spray gun of design and the dephosphorization effect of the present invention in converter Hot Metal Pretreatment in early stage is described.The composite spray gun of design has the function of dusting, blowing, and realizes the function such as the switching of nitrogen oxygen and the lime powder that dusts, limestone powder, iron scale in converting process.
Embodiment 1
At 500kg level converter thermal modeling test stove, load pig iron 250kg, ferrophosphorus 1.6kg, induction heating is warmed up to 1360 DEG C, gets initial iron sample, [C]=4.4%, [Si]=0.5%, [P]=0.22%.Blowing starts, and fall spray gun, Top oxygen blast gas intensity is 1.8Nm
3/ t.min, adds slag making materials lime 8kg, fluorite 1kg, and bottom blowing nitrogen intensity is 0.3Nm
3/ t.min.Spray into lime powder and Iron concentrate mixing powder by spray gun to molten bath after blowing 3min, with oxygen as carrier gas, being always blown into pulvis amount is 5kg, and the flow of carrier gas oxygen is 10Nm
3/ h, after winding-up 3min.During blowing 7 ~ 8min, in the rifle of top, be mixed into the nitrogen of 20%, to control the temperature in molten bath.Composite spray gun rifle position is kept to be 0.3m in converting process.Get steel sample and thermometric, [C]=3.7%, [P]=0.022%, T=1360 DEG C, dephosphorization rate is 90%.Early stage pulls slag out after pretreatment dephosphorizing.
Embodiment 2
At 500kg level converter thermal modeling test stove, load pig iron 250kg, ferrophosphorus 3.0kg, induction heating is warmed up to 1380 DEG C, gets initial iron sample, [C]=4.7%, [Si]=0.35%, [P]=0.50%.Blowing starts, and fall spray gun, Top oxygen blast gas intensity is 1.5 ~ 2.5Nm
3/ t.min, adds slag making materials lime 12kg, fluorite 2.2kg, and bottom blowing nitrogen intensity is 0.4Nm
3/ t.min.Spray into lime powder and Iron concentrate mixing powder by spray gun to molten bath after blowing 4min, with oxygen as carrier gas, being always blown into pulvis amount is 7.5kg, and the flow of carrier gas oxygen is 11Nm
3/ h, after winding-up 4min.During blowing 9 ~ 10min, in the rifle of top, be mixed into the nitrogen of 10%, to control the temperature in molten bath.Get steel sample and thermometric, [C]=3.3%, [P]=0.042%, T=1350 DEG C, dephosphorization rate is 92%.Early stage pulls slag out after pretreatment dephosphorizing.
Embodiment 3
At 500kg level converter thermal modeling test stove, load pig iron 250kg, ferrophosphorus 6.1kg, induction heating is warmed up to 1400 DEG C, gets initial iron sample, [C]=4.5%, [Si]=0.85%, [P]=1.01%.Blowing starts, and fall spray gun, Top oxygen blast gas intensity is 1.5 ~ 2.5Nm
3/ t.min, adds slag making materials lime 12kg, and the terminal slag 6kg of a upper stove, fluorite 2kg, bottom blowing nitrogen intensity is 0.33Nm
3/ t.min.Spray into lime powder and Iron concentrate mixing powder by spray gun to molten bath after blowing 5min, with oxygen as carrier gas, being always blown into pulvis amount is 11kg, and the flow of carrier gas oxygen is 10Nm
3/ h, after winding-up 5min.During blowing 13 ~ 15min, in the rifle of top, be mixed into the nitrogen of 10%, to control the temperature in molten bath.Get steel sample and thermometric, [C]=3.5%, [P]=0.072%, T=1360 DEG C, dephosphorization rate is 93%.Early stage pulls slag out after pretreatment dephosphorizing.
Claims (2)
1. in process the converter of high phosphorus hot metal dust, an air blowing composite spray gun, be made up of the body of a gun and shower nozzle; The body of a gun is made up of four layers of sleeve pipe, and the sleeve pipe at center passes into lime powder and nitrogen, or lime powder and oxygen, and sleeve pipe adjacent with it passes into oxygen, and two remaining sleeve pipes pass into water, as heat-eliminating medium; Inner side is water-in, and outside is water outlet, reduces the temperature of the spray gun body of a gun; The shower nozzle of spray gun adopts the design of single hole Bearing score pipe; Connected by welding process between the body of a gun and shower nozzle, the logical gas fraction of shower nozzle part is consistent with water cooling part with body of a gun part, has import and the outlet of water coolant; The passage of ventilation body and lime powder is an entirety, and gas and lime powder mix at inner chamber, enter the structure of Bearing score pipe afterwards, forms air-flow at a high speed and is sprayed by lance outlet; It is characterized in that,
Adopt the dusting of the Bearing score pipe of single hole design, air blowing combining nozzle: the nozzle adopting the dusting of unique Bearing score pipe design, oxygen blast gas and nitrogen, it is water coolant outside spray orifice, single hole Bearing score pipe nozzle is divided into two sections, contraction section and expansion segment, Mach number is according to 1.5 ~ 2.2 designs, middle pipe passes into oxygen, and interior pipe is the passage of winding-up lime powder and carrier gas nitrogen;
The swing design of the spray gun body of a gun: spray gun installs tilting mechanism on the correct position of cross traveling trolley, thus when realizing blowing, top-blown spray gun freely swings or active roll action in 0.5 ~ 2.5m; Top-blown spray gun spout does with swing diameter and molten bath diameter ratio and swings or directional swing action at random above molten bath in 0 ~ 0.5 scope, realizing the penetration depth that the larger single hole stream stock of surging force and molten bath upper surface formed is the stirring of 0.4 ~ 0.6 with the ratio of pool depth, evenly strengthening melt tank reaction dynamic conditions; Must ensure that the impact area of Oxygen Flow stock to molten bath remains on impact diameter and molten bath area ratio is in the scope of 0.1 ~ 0.25.
2. a using method for composite spray gun according to claim 1, for high phosphorus hot metal in smelting, can adopt permanent rifle bit manipulation or become rifle bit manipulation during blowing; It is characterized in that, according to the processing requirement of blowing different times, oxygen flow makes the appropriate adjustments, and namely air supply intensity is 2.0 ~ 4.5Nm
3/ tmin; In converting process, carry out switching or the nitrogen/oxygen mixed injection of oxygen and nitrogen, switching time is blowing 3 ~ 5min, is completed by the sequence of control of operator's console, to reach the net effect controlling suitable bath temperature and ensure stirring intensity of molten pool; Meanwhile, function of dusting is possessed; The flow that dusts is 20-600kg/min, and pressure is 0.5 ~ 1.6MPa.
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| CN105838845B (en) * | 2016-06-06 | 2018-04-03 | 中冶赛迪工程技术股份有限公司 | A kind of electric arc furnaces supersonic speed ring combustion boundling carbon oxygen lance and nozzle structure |
| CN107034336B (en) * | 2017-05-23 | 2019-02-01 | 钢铁研究总院 | A kind of device and method for improving converter and splashing slag effect |
| CN107723416B (en) * | 2017-11-15 | 2023-04-11 | 钢铁研究总院 | Ladle rotation spray gun dephosphorization device |
| CN107893142A (en) * | 2017-11-29 | 2018-04-10 | 扬州高立达科技产业有限公司 | The control method that two kinds of gases of steelmaking converter top blast accurately mix |
| CN110042187B (en) * | 2019-05-30 | 2024-05-28 | 苏州东大汉森冶金实业有限公司 | Device for modifying slag powder spraying and separating slag steel during converter tapping and use method |
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| CN2143757Y (en) * | 1993-02-09 | 1993-10-13 | 石家庄钢铁厂 | Coal-oxygen jet gun of intensified electric furnace metallurgy |
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| CN202547396U (en) * | 2012-04-13 | 2012-11-21 | 金川集团有限公司 | Metallurgy composite spry gun |
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Patent Citations (4)
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| CN2143757Y (en) * | 1993-02-09 | 1993-10-13 | 石家庄钢铁厂 | Coal-oxygen jet gun of intensified electric furnace metallurgy |
| CN1379115A (en) * | 2002-02-01 | 2002-11-13 | 北京科技大学 | Oxygen blowing apparatus for smelting steel, technology and application |
| CN202547396U (en) * | 2012-04-13 | 2012-11-21 | 金川集团有限公司 | Metallurgy composite spry gun |
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