CN205205168U - A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted - Google Patents
A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted Download PDFInfo
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- CN205205168U CN205205168U CN201520908163.XU CN201520908163U CN205205168U CN 205205168 U CN205205168 U CN 205205168U CN 201520908163 U CN201520908163 U CN 201520908163U CN 205205168 U CN205205168 U CN 205205168U
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Abstract
The utility model discloses a low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted, this oxygen shower nozzle include oxygen efflux passageway, oxygen efflux passageway is including total oxygen passage of a straight section of thick bamboo and fan -shaped branched passage, the central orifice that fan -shaped branched passage set up including central authorities, center orifice annular all around is provided with a plurality of branches orifice to the symmetry, the total oxygen passage top of a straight section of thick bamboo is provided with the interior welded tube with the total oxygen passage inner wall coincidence of a straight section of thick bamboo, the welding has outer welded tube on the outer wall of fan -shaped branched passage bottom, the welding has the breakwater on the fan -shaped branched passage outer wall between outer welded tube and the total oxygen passage of a straight section of thick bamboo, the breakwater top is provided with the well welded tube with the coincidence of breakwater inner wall, the utility model discloses a shower nozzle adopts forging and pressing method one shot forming, and each surface accuracy of shower nozzle is high, and smooth finish is good, and the fever is robbed in the use, dry slag accident rate is low, and average life is long, with low costs.
Description
Technical field
It is nozzle specially used that the utility model relates to converter smelting, is specifically related to a kind of low-temperature low-silicon molten iron oxygen lance blow head for 90 tons of converter smeltings.
Background technology
For the ferrous metallurgy flow process being core process with blast furnace-converter-external refining, suitable blast-melted temperature and composition are the bases ensureing this flow process direct motion.But, along with the day by day variation of present steel enterprise raw material sources, cost control pressures is increasing, the molten iron temperature that blast-furnace smelting is produced and composition fluctuation range obviously strengthen, the frequency also increases gradually, the particularly molten iron condition of the low silicon of low temperature, belong to extremely of inferior quality material condition, all great effect can be produced to converter steelmaking process and effect, be converter current smelt will faced by one of the most outstanding difficult problem, each iron and steel enterprise also controls targetedly in equipment, technique etc., the target that process is steady to reaching, terminal is controlled.
90 tonnes of converters belong to Medium Converter, steel-making enterprise application is the most general at home, this rank converter and 150 tonnes, 200 tons of higher levels are medium-and-large-sized to be compared with mammoth conveter, heat size is less, smelting process heat dissipation rate is high, therefore, at the smelting initial stage, it is poor that slag sprawls condition, if (molten iron is blended into temperature≤1220 DEG C before converter to smelt low-temperature low-silicon molten iron, silicone content≤0.25% simultaneously), on the one hand, molten iron temperature is low, add that the silicon oxidation thermal discharge of originating as slag melting major heat is not enough, direct disadvantageous effect will be caused to melting process, on the other hand, very few SiO
2to enter in slag easily and lime formed dystectic (CaO)
2(SiO
2), (CaO)
3(SiO
2) compound, further delay is slag melting, have a strong impact on converter smelting efficiency, simultaneously, if top blast oxygen supply pattern when still conveniently smelting, when changing that slag successful is not good, furnace inner space is not enough, very easily producing slag expulsion events, all bringing major hidden danger to smelting process, device security and personnel safety.
At present, for improving low-temperature low-silicon molten iron smelting process stability and terminal controllability, particularly smelt the stability at initial stage, each big steel enterprise all takes series of measures, mainly comprise slag charge repeatedly to add in batches, reduce initial stage oxygen supply by lance intensity, improve the first-class mode of oxygen lance spraying, the former two is actual in sacrifice efficiency for cost, and can not solve expulsion problem at all, improves oxygen lance blow head structure also existing more research and the time.Application number is that 98252198.7 Chinese utility model patents disclose a kind of mammoth conveter oxygen lance blow head, this shower nozzle is except basic oxygen road, cooling water channel etc. are similar to ordinary oxygen rifle, its principal feature is provided with same circumferentially in shower nozzle end face, two kinds of bores, different Mach number, different angle 6 spray orifices that are evenly interspersed, its objective is and accelerate decarburizing reaction, improvementization slag condition, minimizing splash etc., and have certain benefit to hot metal containing low silicon smelting control.
Application number be 93241828.7 Chinese utility model patent disclose a kind of mammoth conveter high-strength oxygen shower nozzle, this spray gun distribute except outer ring 4 ~ 6 is except the spray orifice of 12 ° ~ 15 ° of angles with end medullary ray, centre adds minor diameter spray orifice, but the Mach number of center of orifices is higher than periphery about 0.2 Mach, the object of this kind of shower nozzle is also take into account decarburization and change slag two aspect needs, improves efficiency.
Although above-mentioned two kinds of shower nozzle scheme targets improve the stability of hot metal containing low silicon smelting, in practical application, all there is following problem:
1) the former, when oxygen supply intensity keeps stable, nozzle hole number will increase, spray orifice throat area increases, final oxygen jet is worn dark in reducing, the stirring action in molten bath is weakened, then different zones molten steel homogeneity is affected, and efficiency also reduces simultaneously, simultaneously, the design of different spray orifice different Mach number, also can cause between jet and there is certain relative pressure, mutual interference phenomenon increases the weight of, and affects the stability of smelting process, under this extreme condition of smelting low-temperature low-silicon molten iron, easily there is the accidents such as sudden splash;
2) center of the latter adds the design that outer ring is uniformly distributed spray orifice, when effectively can reduce the spray orifice high speed oxygen jet ejection of pure outer ring, in the negative relative district that shower nozzle end central part produces, reduce the generation of shower nozzle dry slag phenomenon, improve life-span of oxygen lance, but the Mach number of this patent center of orifices is higher than periphery about 0.2 Mach, this can cause the mutual interference between different jet equally, will weaken with joint efforts melting bath stirring, is also unfavorable for improving efficiency.
The situation of low-temperature low-silicon molten iron is smelted for Medium Converter, majority carries out certain adjusting and optimizing on operating procedure, effect is also not obvious, if carry out significant improvement at oxygen lance blow head design aspect, iron and steel enterprise will be beneficial to and tackle such extreme molten iron condition, improve efficiency and control stiffness.
Summary of the invention
The purpose of this utility model there is provided a kind of low-temperature low-silicon molten iron oxygen lance blow head for 90 tons of converter smeltings, and this shower nozzle solves problem:
1) smelt heat flux between initial stage slag little, slag melting slow with spreading rate, slag-metal reaction efficiency is low, the corresponding reduction of efficiency, simultaneously easy gas producer slag splash accident.
2) because slag spreadability is poor, cause smelting initial stage silicon oxidation exothermal efficiency not high, when lime is excessive, easily form dystectic (CaO)
2(SiO
2), (CaO)
3(SiO
2) compound, slow down slag melting and reaction further, have serious disadvantageous effect to dephosphorization efficiency and effect, and strengthen splash accident occurrence probability.
3) in smelting process, if oxygen supply by lance intensity is excessive or excessively strong to molten bath surging force, bath temperature is then caused sharply to change, except causing splash risk, also may cause the peroxidation of molten steel, affect terminal point control, increase molten steel oxidation, reduce yield of alloy, worsen the initial purity of molten steel.
For achieving the above object, a kind of low-temperature low-silicon molten iron oxygen lance blow head for 90 tons of converter smeltings designed by the utility model, this oxygen nozzle comprises oxygen jet passage, and described oxygen jet passage comprises straight tube total oxygen passage and fan-shaped branched bottom, described fan-shaped branched bottom comprises the center of orifices that central authorities are arranged, described center of orifices surrounding annular is to being symmetrically arranged with multiple branches spray orifice, described straight tube total oxygen passage top be provided with oxygen vias inner walls total with straight tube overlap in welded tube, described fan-shaped branched bottom bottom outer wall is welded with outer welded tube, described fan-shaped branched bottom and outside weld pipe form shower nozzle end, fan-shaped branched bottom outer wall between described outer welded tube and straight tube total oxygen passage is welded with water eliminator, welded tube during described water eliminator top is provided with and overlaps with water eliminator inwall, the total oxygen passage of described straight tube, interior welded tube, water eliminator, middle welded tube and outside weld pipe form cooling-water duct.Namely water coolant enters between interior, middle welded tube, by the water conservancy diversion of water eliminator, therefrom, flows out between outer welded tube, can ensure the cooling performance of oxygen rifle continuous uniform in shower nozzle use procedure.
Further, described branch nozzle hole number is 4, and the angle of the formation of each branch orifice center line and center of orifices medullary ray is α, α is 13 ~ 14 °
Again further, described center of orifices is identical with the Mach number of branch's spray orifice, is 1.9 ~ 2.1.
Again further, described center of orifices diameter is 20 ~ 24mm, and described branch injection diameter is 26 ~ 30mm.
Again further, the outer wall of described interior welded tube is provided with and organizes grommet type seals more, described interior welded tube external diameter is less than the total oxygen passage of straight tube.The existence of sealing-ring can ensure the relative stopping property of total oxygen path and the stability of oxygen pressure,
Again further, described middle welded tube external diameter is less than water eliminator.
The beneficial effects of the utility model:
1) shower nozzle external diameter 194mm of the present utility model, completely compatible with existing 194 oxygen gun bodies, do not affect normal running and the operation of oxygen gun system;
2) the utility model center of orifices thoroughly solves shower nozzle end negative pressure problem when oxygen rifle works, ensure that peripheral ramifications spray orifice jet is pressed pre-determined direction and sprayed, effectively can ensure oxygen supply intensity on the one hand thus stablize low-temperature low-silicon molten iron to heat up and efficiency, the increase of total area of nozzle hole can reduce oxygen jet intensity again, avoid the slag expulsion events at smelting initial stage, completely avoid on the other hand the interference of negative pressuren zone abnormal disturbances to around spray orifice jet, avoid negative pressuren zone to the congregation of around spray orifice jet simultaneously thus cause jet to wear dark abnormal problem bigger than normal to molten bath, stablize smelting process further, finally, regulated by process rifle position and bottom blowing cooperation, terminal point control can reach requirement, the particularly cooperation of high oxygen-supplying amount and low oxygen jet intensity, obvious benefit is all had to the accurate decarburization of low-temperature low-silicon molten iron and dephosphorization and molten bath homogenizing.
3) shower nozzle of the present utility model adopts forging method once shaped, and each surface accuracy of shower nozzle is high, and smooth finish is good, burn in use procedure rob, dry slag accident rate is low, mean lifetime is long, cost is low.
4) shower nozzle of the present utility model improves low-temperature low-silicon molten iron smelting initial stage intensification efficiency and efficiency, effectively reduces the generation of the accidents such as slag splash;
5) shower nozzle smelting process of the present utility model is more steadily controlled, and decarburization accuracy is higher, and dephosphorization effect also can ensure.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model oxygen lance blow head;
Fig. 2 is the A direction view in Fig. 1, i.e. oxygen rifle upward view.
In figure, oxygen jet passage 1, straight tube total oxygen passage 1.1, fan-shaped branched bottom 1.2, center of orifices 1.21, branch's spray orifice 1.22, interior welded tube 2, outer welded tube 3, water eliminator 4, middle welded tube 5, grommet type seals 6.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, so that those skilled in the art understand.
Embodiment 1
As shown in Fig. 1 ~ 2: a kind of low-temperature low-silicon molten iron oxygen lance blow head for 90 tons of converter smeltings, the external diameter L of shower nozzle
6for 194mm, this oxygen nozzle comprises oxygen jet passage 1, and oxygen jet passage 1 comprises straight tube total oxygen passage 1.1 and fan-shaped branched bottom 1.2; Fan-shaped branched bottom 1.2 comprises the center of orifices 1.21 that central authorities are arranged, center of orifices 1.21 surrounding annular is to being symmetrically arranged with multiple branches spray orifice 1.22, straight tube total oxygen passage 1.1 top be provided with oxygen vias inner walls total with straight tube overlap in welded tube 2, fan-shaped branched bottom 1.2 bottom outer wall is welded with outer welded tube 3, fan-shaped branched bottom 1.2 forms shower nozzle end with outer welded tube 3, and the angle that shower nozzle end and sea line are formed is β=13.5; Fan-shaped branched bottom 1.2 outer wall between outer welded tube 3 and straight tube total oxygen passage 1.1 is welded with water eliminator 4, welded tube 5 during water eliminator 4 top is provided with and overlaps with water eliminator 4 inwall, straight tube total oxygen passage 1.1, interior welded tube 2, water eliminator 4, middle welded tube 5 and outer welded tube 3 form cooling-water duct.Namely water coolant enters between interior, middle welded tube, by the water conservancy diversion of water eliminator, therefrom, flows out between outer welded tube, can ensure the cooling performance of oxygen rifle continuous uniform in shower nozzle use procedure.
Branch's spray orifice 1.22 number is 4, and the angle of the formation of each branch spray orifice 1.22 medullary ray and center of orifices 1.21 medullary ray is α, α is 13.5 °
Center of orifices 1.21 is 2.0 with the Mach number of branch's spray orifice 1.22.
Center of orifices 1.21 diameter is 22mm, and branch's spray orifice 1.22 diameter is 28mm.
Interior welded tube 2 internal diameter L
1for 109mm, the outer wall of interior welded tube 2 is provided with the grommet type seals 6 of many groups, interior welded tube 2 external diameter is less than the total oxygen passage 1.1 of straight tube.The existence of grommet type seals 6 can ensure the relative stopping property of total oxygen path and the stability of oxygen pressure,
Straight tube total oxygen passage 1.1 external diameter L
2for 121mm; Middle welded tube 5 external diameter L
3for 154mm, water eliminator 4L
4external diameter is 159, outer welded tube 3 external diameter L
5for 178mm.
Embodiment for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings: concrete steps are as follows:
1) oxygen lance blow head is welded with rifle body, ensure that welding junction is level and smooth, stopping property good, afterwards oxygen rifle is loaded jacking system;
2) when smelting low-temperature low-silicon molten iron in 90t converter, be blended into after steel scrap and molten iron total amount be about 85t in stove, quickened lime is added by repeatedly a small amount of principle, special oxygen rifle starts blowing, rifle position and conventional oxygen rifle are consistent when smelting common molten iron, about about 1.6m, to keep the stability of operating parameters.
3) in smelting process, furnace charge can be coordinated to add integrated status in operation and stove, rifle position is adjusted between 1.5 ~ 1.8m, remain on 1.5m in stable smelting phase rifle position, blowing controls at about 930 ~ 960S total time, than the normal molten iron prolongation of smelting 30 ~ 60S, if carbon temperature occurs to be coordinated not good, when needing point to blow, point blows rifle position and should control at 1.35m, blows effect with guarantee point.
4) smelt whole process, bottom blowing flow suitably strengthens, by 0.05Nm during the normal molten iron of smelting
3/ tmin is increased to 0.08 ~ 0.1Nm
3the scope of/tmin, to ensure molten bath homogeneity and endpoint control accurate.
Other unspecified part is prior art.Although above-described embodiment has made detailed description to the utility model; but it is only the utility model part embodiment; instead of whole embodiment; people can also obtain other embodiments according to the present embodiment under without creative prerequisite, and these embodiments all belong to the utility model protection domain.
Claims (6)
1. the low-temperature low-silicon molten iron oxygen lance blow head for 90 tons of converter smeltings, it is characterized in that: described low-temperature low-silicon molten iron oxygen lance blow head comprises oxygen jet passage (1), described oxygen jet passage (1) comprises straight tube total oxygen passage (1.1) and fan-shaped branched bottom (1.2), described fan-shaped branched bottom (1.2) comprises the center of orifices (1.21) that central authorities are arranged, described center of orifices (1.21) surrounding annular is to being symmetrically arranged with multiple branches spray orifice (1.22), described straight tube total oxygen passage (1.1) top be provided with oxygen vias inner walls total with straight tube overlap in welded tube (2), described fan-shaped branched bottom (1.2) bottom outer wall is welded with outer welded tube (3), described fan-shaped branched bottom (1.2) and outer welded tube (3) form shower nozzle end, fan-shaped branched bottom (1.2) outer wall between described outer welded tube (3) and straight tube total oxygen passage (1.1) is welded with water eliminator (4), described water eliminator (4) top is provided with the middle welded tube (5) overlapped with water eliminator (4) inwall, the total oxygen passage (1.1) of described straight tube, interior welded tube (2), water eliminator (4), middle welded tube (5) and outer welded tube (3) form cooling-water duct.
2. according to claim 1 for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings, it is characterized in that: described branch spray orifice (1.22) number is 4, and the angle of the formation of each branch spray orifice (1.22) medullary ray and center of orifices (1.21) medullary ray is α, α is 13 ~ 14 °.
3. according to claim 1 or 2 for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings, it is characterized in that: described center of orifices (1.21) is identical with the Mach number of branch's spray orifice (1.22), is 1.9 ~ 2.1.
4. according to claim 3 for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings, it is characterized in that: described center of orifices (1.21) diameter is 20 ~ 24mm, described branch spray orifice (1.22) diameter is 26 ~ 30mm.
5. according to claim 1 or 2 for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings, it is characterized in that: the outer wall of described interior welded tube (2) is provided with and organizes grommet type seals (6) more, described interior welded tube (2) external diameter is less than the total oxygen passage (1.1) of straight tube.
6. according to claim 1 or 2 for the low-temperature low-silicon molten iron oxygen lance blow head of 90 tons of converter smeltings, it is characterized in that: described middle welded tube (5) external diameter is less than water eliminator (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520908163.XU CN205205168U (en) | 2015-11-13 | 2015-11-13 | A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520908163.XU CN205205168U (en) | 2015-11-13 | 2015-11-13 | A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted |
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|---|---|
| CN205205168U true CN205205168U (en) | 2016-05-04 |
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|---|---|---|---|
| CN201520908163.XU Expired - Fee Related CN205205168U (en) | 2015-11-13 | 2015-11-13 | A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113215353A (en) * | 2021-05-14 | 2021-08-06 | 辽宁科技大学 | Double Mach number oxygen lance nozzle |
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2015
- 2015-11-13 CN CN201520908163.XU patent/CN205205168U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113215353A (en) * | 2021-05-14 | 2021-08-06 | 辽宁科技大学 | Double Mach number oxygen lance nozzle |
| CN113215353B (en) * | 2021-05-14 | 2022-11-04 | 辽宁科技大学 | Double Mach number oxygen lance nozzle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170712 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: WUHAN IRON AND STEEL Co.,Ltd. Address before: 430080 Wuhan, Hubei, Wuchang Friendship Avenue, No. 999, block A, layer 15, layer Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 Termination date: 20211113 |