CN212357291U - Oxygen lance nozzle with efficient dephosphorization - Google Patents
Oxygen lance nozzle with efficient dephosphorization Download PDFInfo
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Abstract
The utility model belongs to the technical field of ferrous metallurgy, especially, relate to an oxygen rifle shower nozzle of high-efficient dephosphorization, including shower nozzle oxygen entry, the water annular joint of intaking, go out the water annular joint, several oxygen rifle orifice, its characterized in that several oxygen rifle orifice is a set of oxygen rifle orifice I and a set of oxygen rifle orifice II staggered arrangement and distributes, and a set of oxygen rifle orifice I arranges in the periphery of shower nozzle terminal surface, and a set of oxygen rifle orifice II arranges in the inboard of shower nozzle terminal surface, and oxygen rifle orifice I diameter is greater than oxygen rifle orifice II diameter, and oxygen rifle orifice I's inclination is greater than oxygen rifle orifice II's inclination. Compared with the traditional oxygen lance nozzles under the same converter capacity, the utility model weakens the interaction between the jet streams of the large spray holes of the oxygen lance nozzles, increases the contact area between the jet streams and the molten pool, obviously improves the liquid drop generation speed of the jet streams and the molten pool, and has obvious dephosphorization effect.
Description
Technical Field
The utility model belongs to the technical field of ferrous metallurgy, especially, relate to an oxygen rifle shower nozzle of high-efficient dephosphorization.
Background
In the top-blown converter steelmaking (BOF) process, it is very important to form molten slag with the proper composition (e.g., basicity and FeO content) because dephosphorization depends mainly on the slag composition, furnace temperature, and the dynamics and mass transfer processes through the mixing of the liquid metal and the slag. In blowing, carbon oxidizes to form carbon monoxide gas and attempts to escape through the slag causing volume expansion, commonly referred to as slag foaming, which provides a large interfacial area between the slag, metal and gas phases, promoting interfacial reactions and enhancing dephosphorization. The generation and maintenance of slag foam is primarily controlled by the oxygen jets of the lance. Therefore, the improvement of the generation amount of metal liquid drops in the foam slag is a great challenge for improving slag-gold interface reaction and improving dephosphorization rate in the steel mill at present. In addition, the variation of lance height is a key process control means in the converter blowing process in steel plants. By changing the height of the oxygen lance, the oxygen distribution between the slag and the metal phase can be changed, thereby influencing the chemical reaction. Therefore, it is necessary to properly design the lance and control the lance position and the oxygen flow rate during the blowing process to improve the efficiency of the steelmaking process and to improve the quality of the steel produced.
At present, a porous laval oxygen lance nozzle structure widely adopted by steel enterprises in China is shown in figure 1, and is characterized in that all nozzle holes of the nozzle have the same size and shape and are uniformly distributed around the axis of the oxygen lance, and the nozzle hole inclination angle and the nozzle hole number of the oxygen lance with the traditional structure are strictly limited under the determined converter capacity. Because the lance tip is designed at a specific pressure ratio and flow rate, it is not possible to vary the flow rate of lance nozzles of conventional construction. Oxygen lance design is carried out according to the operating conditions of the converter, and the blowing effect is changed through lance position adjustment, which is still the most common process control parameter in the blowing process.
Disclosure of Invention
The utility model aims at providing an oxygen rifle shower nozzle of high-efficient dephosphorization aims at improving the production of splash molten steel when converting to reaction process, especially dephosphorization reaction are accelerated, thereby improve dephosphorization efficiency.
The purpose of the utility model is realized by the following technical scheme:
the utility model discloses an oxygen lance nozzle with high dephosphorization efficiency, which comprises a nozzle oxygen inlet, a water inlet circular seam, a water outlet circular seam and a plurality of oxygen lance spray holes, and is characterized in that the plurality of oxygen lance spray holes are distributed in a group of oxygen lance spray holes I and a group of oxygen lance spray holes II in a staggered arrangement, the group of oxygen lance spray holes I are arranged at the periphery of the nozzle end face, the group of oxygen lance spray holes II are arranged at the inner side of the nozzle end face,
the diameter of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II, and the inclination angle of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II.
The group of oxygen lance spray holes I and the group of oxygen lance spray holes II are Laval spray pipes.
The ratio of the diameter d12 of the throat part I of the oxygen lance spray hole I to the diameter d22 of the throat part II of the oxygen lance spray hole II is d12/d22 which is 1.05-1.55.
The ratio of the diameter d13 of the outlet of the oxygen lance spray hole I to the diameter d23 of the outlet of the oxygen lance spray hole II is d13/d23 which is 1.05-1.55.
The relation between the included angle alpha 1 between the central axis of the oxygen lance spray hole I and the central axis of the spray head and the included angle alpha 2 between the central axis of the oxygen lance spray hole II and the central axis of the spray head is that alpha 1-alpha 2 is 3-5 degrees.
The distance between the center of the outlet of the oxygen lance spray hole I and the center line of the spray head is L11, and the distance between the center of the outlet of the oxygen lance spray hole II and the center line of the spray head is L2, wherein L11/L2 is 1.10-1.30.
The total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 4, 6 or 8,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 4, the number of the oxygen lance spray holes I is 2, the number of the oxygen lance spray holes II is 2,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 6, the number of the oxygen lance spray holes I is 3, the number of the oxygen lance spray holes II is 3,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 8, the number of the oxygen lance spray holes I is 4, and the number of the oxygen lance spray holes II is 4.
The utility model has the advantages that:
(1) compared with the traditional oxygen lance nozzle with the same converter capacity, the arrangement scheme of the large spray holes of the oxygen lance nozzle weakens the interaction between the jet streams, increases the contact area between the jet stream and the molten pool, obviously improves the liquid drop generation speed of the jet stream and the molten pool, and has obvious dephosphorization effect; smelting the same steel grade on the premise of ensuring the same molten iron pretreatment components, the same scrap steel adding amount and the same slag adding amount in the converter steelmaking process, and improving the dephosphorization rate by 3-8%;
(2) the utility model discloses an oxygen lance nozzle of high-efficient dephosphorization uses the oxygen lance nozzle of high-efficient dephosphorization, has prolonged the life of oxygen lance nozzle: the arrangement scheme of the staggered arrangement of the peripheral large spray holes and the inner small spray holes provides a water cooling space which is more beneficial to the flow of fluid, and the number of smelting furnaces of the oxygen lance of the utility model is increased by 30-50 times compared with the number of smelting furnaces of the traditional oxygen lance under the same smelting condition;
(3) the utility model discloses an oxygen lance nozzle of high-efficient dephosphorization uses the oxygen lance nozzle of high-efficient dephosphorization, prevents that the slag from returning futilely: in the middle stage of converting, the oxygen content in the molten pool has a downward trend, FeO can be reduced, and the slag is sticky, so that the utility model can make up for the deficiency, thereby preventing dry slag from forming;
(4) the utility model discloses an oxygen rifle shower nozzle of high-efficient dephosphorization uses the oxygen rifle shower nozzle of high-efficient dephosphorization, better process control: the production of metal drips can influence getting rid of phosphorus and carbon, the utility model discloses a big aperture flow ratio of oxygen rifle shower nozzle of high-efficient dephosphorization is controllable to influence the production of liquid drip, consequently can act as another converting process control key element, make things convenient for the dynamic control of converting process.
Drawings
FIG. 1 is a schematic view of a conventional lance tip 6 hole nozzle shape.
FIG. 2 is a sectional view of the oxygen lance nozzle of the present invention.
FIG. 3 is a schematic view of the shape of 4-hole nozzle of the oxygen lance nozzle of the present invention.
FIG. 4 is a schematic view of the shape of a 6-hole nozzle of the oxygen lance nozzle of the present invention.
FIG. 5 is a schematic view of the oxygen lance nozzle 8 holes.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in figures 1-5, the utility model discloses an oxygen lance nozzle for efficient dephosphorization, which comprises a nozzle oxygen inlet, a water inlet circular seam, a water outlet circular seam and a plurality of oxygen lance spray holes, and is characterized in that the plurality of oxygen lance spray holes are distributed in a staggered way by a group of oxygen lance spray holes I and a group of oxygen lance spray holes II, the group of oxygen lance spray holes I are arranged on the periphery of the nozzle end surface, the group of oxygen lance spray holes II are arranged on the inner side of the nozzle end surface,
the diameter of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II, and the inclination angle of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II.
The group of oxygen lance spray holes I and the group of oxygen lance spray holes II are Laval spray pipes.
The ratio of the diameter d12 of the throat of the oxygen lance spray hole I to the diameter d22 of the throat of the oxygen lance spray hole II is d12/d22 which is 1.05-1.55.
The ratio of the diameter d13 of the outlet of the oxygen lance spray hole I to the diameter d23 of the outlet of the oxygen lance spray hole II is d13/d23 which is 1.05-1.55.
The relation between the included angle alpha 1 between the central axis of the oxygen lance spray hole I and the central axis of the spray head and the included angle alpha 2 between the central axis of the oxygen lance spray hole II and the central axis of the spray head is that alpha 1-alpha 2 is 3-5 degrees.
The distance between the center of the outlet of the oxygen lance spray hole I and the center line of the spray head is L1, and the distance between the center of the outlet of the oxygen lance spray hole II and the center line of the spray head is L2, wherein L1/L2 is 1.10-1.30.
The total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 4, 6 or 8,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 4, the number of the oxygen lance spray holes I is 2, the number of the oxygen lance spray holes II is 2,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 6, the number of the oxygen lance spray holes I is 3, the number of the oxygen lance spray holes II is 3,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 8, the number of the oxygen lance spray holes I is 4, and the number of the oxygen lance spray holes II is 4.
An oxygen lance nozzle blowing process for efficiently dephosphorizing is characterized in that the process conditions are as follows:
(1) the total oxygen pressure is more than or equal to 1.3MPa, and the working oxygen pressure is 0.9MPa to 1.1 MPa;
(2) by combining the structural characteristics of the oxygen lance nozzle for efficiently dephosphorizing,
the blowing gun is positioned at (35-40) times of the diameter of the outlet of the oxygen gun spray hole I;
the process lance position is (30-35) times of the diameter change of the outlet of the oxygen lance spray hole I;
the carbon drawing gun position (20-25) is multiplied by the diameter change of the outlet of the oxygen lance spray orifice I.
The utility model discloses an oxygen rifle shower nozzle of high-efficient dephosphorization, change traditional porous efflux oxygen rifle shower nozzle structure and jetting technology, adopt a set of big orifice and a set of little orifice to replace traditional oxygen rifle orifice, big orifice adopts the periphery of relatively great gradient arrangement at the shower nozzle terminal surface, at the converting in-process, the fast integration of efflux stream has been avoided to the big inclination angle of big orifice, each stream has been guaranteed in the independence of efflux direction, thereby the area of contact of efflux stream and molten bath has been increased, and the stream jet strength of dispersion is relatively weak, prevent at to a great extent that the splash is too high and spout the stove mouth. Compared with a large spray hole, the small spray hole is arranged on the inner side of the end face of the spray head in a relatively small inclination mode, the jet stream is fused earlier due to the small inclination, the fused stream has large jet energy, and the stirring intensity of a converting process to a molten pool is guaranteed.
An oxygen lance nozzle for efficiently dephosphorizing is shown in figure 2 and comprises a nozzle oxygen inlet 1, an oxygen lance spray hole II2, an oxygen lance spray hole I3, a water inlet annular seam 4 and a water outlet annular seam 5. The oxygen lance spray holes II2 and the oxygen lance spray holes I3 are Laval spray pipes which are distributed in a staggered arrangement mode, the included angle between the central axis of the oxygen lance spray holes I3 and the central axis of the spray head is alpha 1, and the included angle between the central axis of the oxygen lance spray holes II2 and the central axis of the spray head is alpha 2; the diameter of the throat part of the oxygen lance spray hole I3 is d12, the diameter of the outlet of the oxygen lance spray hole I3 is d13, the diameter of the throat part of the oxygen lance spray hole II2 is d22, and the diameter of the outlet of the oxygen lance spray hole I23 is d; the distance between the center of the outlet circle of the oxygen lance spray hole I3 and the center line of the spray head is L11, and the distance between the center of the outlet circle of the oxygen lance spray hole II2 and the center line of the spray head is L2; oxygen for blowing enters the oxygen inlet of the nozzle from the oxygen branch pipe and then enters the oxygen lance spray hole I3 and the oxygen lance spray hole II2 to form supersonic jet.
The ratio of the throat diameter d12 of the oxygen lance spray hole I3 to the throat diameter d22 of the oxygen lance spray hole II2 is d12/d 22-1.05-1.55, the ratio of the outlet diameter d13 of the oxygen lance spray hole I3 to the outlet diameter d23 of the oxygen lance spray hole II2 is d13/d 23-1.05-1.55, the relation between the included angle alpha 1 between the central axis of the oxygen lance spray hole I3 and the central axis of the spray head and the included angle alpha 2 between the central axis of the oxygen lance spray hole II2 and the central axis of the spray head is alpha 1-alpha 2-3-5 degrees, the relation between the outlet center of the oxygen lance spray hole I3 and the spray head central axis is L11, and the outlet center of the oxygen lance spray hole II2 and the spray head central axis is L2 is L11/L2-1..
The number of the spray holes is determined according to the capacity of the converter, and for 100-150 tons of converters, the total number of the oxygen lance spray heads is 4, wherein 2 oxygen lance spray holes I3 and 2 oxygen lance spray holes II2 are formed; for a 200-260 ton converter, the total number of the oxygen lance nozzles is 6, wherein 3 oxygen lance nozzles are I3, and 3 oxygen lance nozzles are II 2; for a converter of 300-350 tons, the total number of the oxygen lance nozzles is 8, wherein 4 oxygen lance nozzles are provided with an I3 hole, and 4 oxygen lance nozzles are provided with an II2 hole.
Example 1
For verifying the utility model discloses compare in the obvious effect of traditional oxygen lance shower nozzle, carried out the contrast experiment of high-efficient dephosphorization oxygen lance shower nozzle under the same smelting condition and traditional oxygen lance shower nozzle, the specific size of two oxygen lance shower nozzles sees table 1.
TABLE 1260 t geometrical parameters of conventional oxygen lance nozzle and highly effective dephosphorizing oxygen lance nozzle for converter
During the experiment, the produced steel is an automobile plate, the amount of molten iron is 260t, the amount of scrap is 30-40t, the total pipe oxygen pressure is 1.4MPa, the working oxygen pressure is 1.0MPa, and the oxygen supply flow is 54000Nm 3/h. The blowing gun position is changed at 2.6-3.1 m, the process gun position is changed at 2.4-2.7 m, the carbon drawing gun position is changed at 2.0-2.3 m, and the carbon drawing gun position slightly floats according to the field condition.
In order to ensure the accuracy of the experiment, the components of the pretreated molten iron for the experiment are shown in table 2, and the difference between each heat and the average value is small. Representative blowing effects of 5 continuous furnaces were recorded and analyzed by comparison.
TABLE 2 comparison of the composition of pretreated molten irons
The results of the experiment are shown in tables 3 and 4. Since the experimental smelting steel types are the same, the difference in tapping components is small, the average tapping component values of 5 furnaces of the traditional oxygen lance and the novel structure oxygen lance are counted in the table 3, and the results show that the control of the tapping components by the two different oxygen lances is similar.
TABLE 3 comparison of the mean values of the tapping components
| Oxygen lance type | Actual value of C | Actual value of Si | Actual value of Mn | Pragmatic value | Actual value of S |
| Traditional oxygen lance% | 0.0474 | 0.0047 | 0.0991 | 0.0213 | 0.0157 |
| High efficiency dephosphorization oxygen lance% | 0.0463 | 0.0042 | 0.0979 | 0.0207 | 0.0124 |
TABLE 4 dephosphorization ratio comparison
| |
1 | 2 | 3 | 4 | 5 | Mean value of |
| Traditional oxygen lance% | 74.2 | 80.6 | 78.9 | 80.5 | 81.9 | 79.22 |
| High efficiency dephosphorization oxygen lance% | 79.9 | 83.8 | 84.1 | 81.5 | 83.4 | 82.54 |
From the comparison of the dephosphorization rates in Table 4, it is found that the dephosphorization rate of the continuous 5-furnace steel grade of the high-efficiency dephosphorization oxygen lance is 3.32% higher than that of the same continuous 5-furnace steel grade of the traditional oxygen lance. The dephosphorization rate is improved obviously, the main reason is that after the dispersion stream with a large inclination angle is adopted, the jet flow distribution range is large, the independence of the jet flow stream is good, and the attenuation speed of the stream is slowed, so that the area of a formed impact pit is increased, splashed metal drops formed in the furnace are more dispersed, the effect on the early stage rapid slagging is positive, the time for forming the foamed slag is shortened, and the dephosphorization rate is improved.
Example 2
Compare "a single-channel dual-structure oxygen lance nozzle and converting process". The technology 1) single-channel double-structure oxygen lance nozzle and the blowing process aim to improve jet strength, ensure the stirring effect of the jet oxygen lance on a molten pool and reduce splashing. The utility model aims to increase the in-furnace splashing amount generated after the action of the oxygen lance nozzle jet flow and the molten bath. 2) The two types of applicable steel are different, the single-channel double-structure oxygen lance nozzle has wider applicability, but the dephosphorization effect of the steel type with high requirement on the dephosphorization rate is not much different from that of the traditional oxygen lance, and compared with the traditional oxygen lance, the stirring effect of the high-efficiency dephosphorization oxygen lance on a molten pool is probably inferior to that of the single-channel double-structure oxygen lance nozzle, but the dephosphorization effect is very obvious. 3) Based on different jet flow principles, the single-channel double-structure oxygen lance nozzle defines a main hole and an auxiliary hole respectively. The big inclination of the exit diameter of the main hole is little, and the primary function is the impact effect and the stirring strength of reinforcing efflux to the molten bath, the distance of the efflux core space of extension shower nozzle, and the little inclination of vice hole exit diameter is big, and the primary function is alleviated the jet attenuation of main hole, increases the molten bath and strikes the area, indirectly improves the slagging effect. The design of the efficient dephosphorization oxygen lance is just opposite, the large spray holes are arranged on the outer side and are arranged at a large inclination angle, the independence of each jet flow is kept, the splashing amount of metal drops is enhanced, and the small spray holes are arranged on the inner side and are designed at a small inclination angle based on the principle that the small inclination angle jet flow is easier to converge so as to meet the jet flow strength enough for a molten pool.
In order to verify the blowing differences of two different types of oxygen lances, the blowing effects of a single-channel double-structure oxygen lance nozzle and a high-efficiency dephosphorization oxygen lance nozzle under the same blowing conditions were further compared with example 2, the experimental process was the same as that of example 1, and the specific dimensions of the two oxygen lance nozzles are shown in table 5
Table 5260 t geometrical parameters of traditional oxygen lance nozzle and high-efficiency dephosphorizing oxygen lance nozzle for converter
During the experiment, the produced steel is an automobile plate, the amount of molten iron is 260t, the amount of scrap steel is 35-45 t, the total pipe oxygen pressure is 1.4MPa, the working oxygen pressure is 1.0MPa, and the oxygen supply flow is 54000Nm 3/h. The blowing gun position is changed at 2.6-3.1 m, the process gun position is changed at 2.4-2.7 m, the carbon drawing gun position is changed at 2.0-2.3 m, and the floating is actually realized according to the scene. In order to ensure the accuracy of the experiment, the difference of the components and the mean value of the pretreated molten iron is within +/-5 percent. Representative blowing effects of 5 continuous furnaces were recorded and analyzed by comparison.
On the premise of little difference of tapping components (within +/-5% of the mean difference), the average value of key smelting indexes of respective continuous 5 furnaces of the high-efficiency dephosphorization oxygen lance and the single-channel double-structure oxygen lance is calculated in the table 6.
TABLE 6 analysis of key smelting indexes
| Parameter(s) | Single-channel double-structure oxygen lance | High-efficiency dephosphorizing oxygen lance |
| Converting time/second | 14 minutes 37 seconds | 15 minutes and 19 seconds |
| Dephosphorization rate/% | 79.98 | 84.02 |
| Oxygen consumption/m3/t | 41.42 | 43.87 |
| Oxygen supply intensity/m3/t min | 3.19 | 2.87 |
| Consumption of iron and steel material/kg/t | 1110 | 1102 |
| Slag consumption/t | 53.7 | 51.2 |
Compared with key indexes, the results show that the single-channel double-structure oxygen lance has the advantages of shortening the blowing time by 42 seconds, improving the oxygen supply strength by 0.32m3/t min and reducing the oxygen consumption by 2.45m3/t, which is mainly benefited by the higher jet impact strength of the single-channel double-structure oxygen lance. The high-efficiency dephosphorization oxygen lance has the advantages that the dephosphorization rate is improved by 4.04 percent, the slag consumption is reduced by 2.5t, and the iron and steel material consumption is reduced by 98kg/t, which is mainly benefited by good metal droplet splashing in the furnace formed by the action of the high-efficiency dephosphorization oxygen lance and a molten pool.
To sum up, compare with present oxygen rifle shower nozzle, the utility model relates to an oxygen rifle shower nozzle and converting technology of high-efficient dephosphorization can effectively reduce the dephosphorization rate, has wide prospect to the steel grade that has higher dephosphorization task at present.
Compared with the traditional oxygen lance nozzle with the same converter capacity, the arrangement scheme of the large spray holes of the oxygen lance nozzle weakens the interaction between the jet streams, increases the contact area between the jet stream and the molten pool, obviously improves the liquid drop generation speed of the jet stream and the molten pool, and has obvious dephosphorization effect; smelting the same steel grade on the premise of ensuring the same molten iron pretreatment components, the same scrap steel adding amount and the same slag adding amount in the converter steelmaking process, and improving the dephosphorization rate by 3-8%; the utility model discloses an oxygen lance nozzle of high-efficient dephosphorization uses the oxygen lance nozzle of high-efficient dephosphorization, has prolonged the life of oxygen lance nozzle: the arrangement scheme of the staggered arrangement of the peripheral large spray holes and the inner small spray holes provides a water cooling space which is more beneficial to the flow of fluid, and the number of smelting furnaces of the oxygen lance of the utility model is increased by 30-50 times compared with the number of smelting furnaces of the traditional oxygen lance under the same smelting condition; the oxygen lance nozzle with high-efficiency dephosphorization is used for preventing slag from drying again: in the middle stage of converting, the oxygen content in the molten pool has a downward trend, FeO can be reduced, and the slag is sticky, so that the utility model can make up for the deficiency, thereby preventing dry slag from forming; the oxygen lance nozzle with high-efficiency dephosphorization is used, and the process is better controlled: the production of metal drips can influence getting rid of phosphorus and carbon, the utility model discloses a big aperture flow ratio of oxygen rifle shower nozzle of high-efficient dephosphorization is controllable to influence the production of liquid drip, consequently can act as another converting process control key element, make things convenient for the dynamic control of converting process.
Claims (7)
1. An oxygen lance nozzle with high dephosphorization efficiency comprises a nozzle oxygen inlet, a water inlet circular seam, a water outlet circular seam and a plurality of oxygen lance spray holes, and is characterized in that the plurality of oxygen lance spray holes are distributed in a way that a group of oxygen lance spray holes I and a group of oxygen lance spray holes II are arranged in a staggered way, the group of oxygen lance spray holes I is arranged at the periphery of the nozzle end surface, the group of oxygen lance spray holes II is arranged at the inner side of the nozzle end surface,
the diameter of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II, and the inclination angle of the oxygen lance spray hole I is larger than that of the oxygen lance spray hole II.
2. The dephosphorizing lance nozzle of claim 1 wherein said lance orifices of group I and group II are Laval nozzles.
3. The highly dephosphorizing lance nozzle according to claim 1 wherein the ratio of the diameter d12 of the throat I of lance nozzle to the diameter d22 of the throat II of lance nozzle is d12/d 22-1.05-1.55.
4. The highly dephosphorizing lance nozzle according to claim 1, wherein the ratio of the diameter d13 of the outlet of lance nozzle i to the diameter d23 of the outlet of lance nozzle ii is 1.05-1.55 (d 13/d 23).
5. The oxygen lance nozzle for efficient dephosphorization according to claim 1, wherein the relationship between the angle α 1 between the central axis of the oxygen lance nozzle hole i and the central axis of the nozzle and the angle α 2 between the central axis of the oxygen lance nozzle hole ii and the central axis of the nozzle is α 1- α 2 ═ 3 ° to 5 °.
6. The highly dephosphorizing lance nozzle according to claim 1 wherein said lance nozzle I exit center is located L1 from the center line of the nozzle and said lance nozzle II exit center is located L2 from the center line of the nozzle with L1/L2 being 1.10-1.30.
7. The highly dephosphorizing lance nozzle according to claim 1 wherein the total number of said plurality of lance orifices I and said plurality of lance orifices II is 4, 6 or 8,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 4, the number of the oxygen lance spray holes I is 2, the number of the oxygen lance spray holes II is 2,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 6, the number of the oxygen lance spray holes I is 3, the number of the oxygen lance spray holes II is 3,
when the total number of the group of oxygen lance spray holes I and the group of oxygen lance spray holes II is 8, the number of the oxygen lance spray holes I is 4, and the number of the oxygen lance spray holes II is 4.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850232A (en) * | 2020-09-09 | 2020-10-30 | 辽宁科技大学 | Oxygen lance nozzle for efficient dephosphorization and blowing process |
| CN114134281A (en) * | 2021-11-30 | 2022-03-04 | 首钢集团有限公司 | Oxygen lance nozzle and blowing smelting method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850232A (en) * | 2020-09-09 | 2020-10-30 | 辽宁科技大学 | Oxygen lance nozzle for efficient dephosphorization and blowing process |
| CN114134281A (en) * | 2021-11-30 | 2022-03-04 | 首钢集团有限公司 | Oxygen lance nozzle and blowing smelting method thereof |
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