CN207738801U - A kind of dual channel design RH refining furnace top blast nozzles - Google Patents
A kind of dual channel design RH refining furnace top blast nozzles Download PDFInfo
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- CN207738801U CN207738801U CN201820019176.5U CN201820019176U CN207738801U CN 207738801 U CN207738801 U CN 207738801U CN 201820019176 U CN201820019176 U CN 201820019176U CN 207738801 U CN207738801 U CN 207738801U
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Abstract
A kind of dual channel design RH refining furnace top blast nozzles, type belong to RH refining techniques field.Including center oxygen channel, subsidiary oxygen way, subsidiary oxygen hole, main oxygen hole, layer 6 pipe, layer 5 pipe, the 4th layer of pipe, third layer pipe, second layer pipe, central oxygen pipe；It is cased with second layer pipe outside central oxygen pipe, it is cased with third layer pipe outside second layer pipe, it is cased with the 4th layer of pipe outside third layer pipe, center oxygen channel is connected with subsidiary oxygen way with two runner interfaces, 4th layer of pipe is outer to be cased with layer 5 pipe, is cased with layer 6 pipe outside layer 5 pipe, the roads the Zhu Yang intake tunnel of center oxygen channel is connected with the roads Zhu Yang exhalant canal, the subsidiary oxygen way intake tunnel of subsidiary oxygen way is connected with subsidiary oxygen way exhalant canal, by being weldingly connected between each layer pipe.The advantage is that the dual channel top blast nozzle of design can improve post-combustion rate to 70~75%, the utilization ratio of RH furnace heats is substantially increased.
Description
Technical field
The utility model belongs to RH refining techniques field, is specifically related to a kind of dual channel design RH refining furnace top blast spray
Head is suitable for the vacuum decarburization process of RH refining furnaces.
Background technology
The 1980s mid-term, Japan has developed RH vacuum decarburization technologies, from this, RH refine High Purity sheet steel into
Enter the new stage.At the beginning of 21 century, there are 165 sets of RH equipment, wherein 46 sets of OB types in the world, 36 sets of KTB types, in addition also it is other such as
A variety of RH processing equipments such as IJ types, PB, MFB, but aforementioned two types account for major portion.
RH-OB installs oxygen blast nozzle in the vacuum chamber bottom sidewall of molten steel vacuum circulating degasser, to vacuum chamber steel
Water oxygen blast removes the carbon in molten steel, and this method can make the level that carbon in the molten steel handled by RH reaches 0.002%.New day
Iron room orchid RH-OB that iron was developed in 1972 and converter compounding technique, successfully produce chromium stainless steel.And then,
A point iron institute processed greatly of Nippon Steel has developed RH-OB vacuum refining process technologies on its basis again, is blown using converter, RH-OB vacuum
Oxygen method carries out pressure decarburization plus aluminium oxygen blast increases liquid steel temperature, and the technologies such as production aluminum killed steel are born to alleviate converter,
The purpose that aim carbon tapping is determined in converter is realized, converter operating rate is improved, reduces deoxidized aluminium consumption.RH-OB vacuum oxygen technologies exist
Itself weakness exposed while development also counteracts the further development of its technology, and being mainly reflected in RH-OB nozzle lifes has
Limit, reduces the operating rate of RH equipment；Splash is serious, increases the dross and subsidiary operation time of RH vacuum chambers；It is more demanding
RH vacuum pumps ability.
RH-KTB devices be on the basis of RH vacuum refining methods where Kawasaki, Japan iron in 1988 for improve smelt it is ultralow
The vacuum decarburization rate of carbon steel and the new technology developed.Using KTB rifles by oxygen from RH vacuum chamber ullages with supersonic speed
Stream is blown into molten bath, and part of oxygen is reacted with [C] in molten steel generates CO, and part of oxygen is dissolved into molten steel into dissolved oxygen and steel
[C] reaction in liquid realizes when high-carbon regions [O] is relative to [C] deficiency, utilizes O2Deep carbonization treatment is carried out, that is, is accelerated
Decarburizing reaction speed also makes [C] to be reduced to more low-level.The part O that the CO of rising can be sprayed with KTB rifles2Reaction, second-time burning
Generate CO2, and release certain chemical heat.According to the literature, the post-combustion rate of RH-KTB is 40~60% or so, temperature
Compensation can make Tapping Temperature of Bof allow 20~26 DEG C of reduction.
Further to play the secondary burning technology advantage in RH refining furnaces, use for reference secondary in the equipment such as converter or electric furnace
Combustion reaction feature is developed very necessary suitable for the Oxygen Lance With Secondary Combustion in RH refining furnaces.By analyzing RH-KTB top blast
The feature of spray gun etc. makes RH-KTB spray gun spray nozzles be provided simultaneously with main oxygen jet stream and secondary oxygen while keeping top-blown spray gun advantage
Jet stream condition, main oxygen jet stream be mainly used to promote molten steel decarburization and part heat up, subsidiary oxygen hole spray oxygen can further and
The CO gases that molten bath rises fully react, and promote the raising of post-combustion rate in RH stoves.
Using the special post-combustion lance of RH top blast oxygen with the above function, will not only ensure it is original under the conditions of quickly
The performance of decarburization technique can also make molten steel cool down in vacuum process during fully improving the thermal efficiency in stove
Speed reduces, and can further decrease Tapping Temperature of Bof in this way and improve tapping endpoint carbon content, make converter processing cost again
It is primary to reduce, while alleviating the indoor cold steel of RH vacuum and bonding, prevent the generation of dross.
Invention content
The purpose of this utility model is to provide a kind of dual channels to design RH refining furnace top blast nozzles, can by the equipment
Further promote RH refining furnaces in second-time burning and efficiency.
The utility model includes center oxygen channel 1, subsidiary oxygen way 2, (the 4th layer of pipe 11 and the 5th of subsidiary oxygen way intake tunnel 3
Layer pipe 10 between), subsidiary oxygen way exhalant canal 4 (between layer 5 pipe 10 and layer 6 pipe 9), subsidiary oxygen hole 5, the roads Zhu Yang intake tunnel
6 (between central oxygen pipe 14 and second layer pipes 13), main oxygen say water channel 7 (between second layer pipe 13 and third layer pipe 12), master
Oxygen hole 8, layer 6 pipe 9, layer 5 pipe 10, the 4th layer of pipe 11, third layer pipe 12, second layer pipe 13, central oxygen pipe 14.Central oxygen
It is cased with second layer pipe 13 outside pipe 14, forms the roads Zhu Yang intake tunnel 6, second layer pipe 13 between central oxygen pipe 14 and second layer pipe 13
It is cased with third layer pipe 12 outside, main oxygen is formed between second layer pipe 13 and third layer pipe 12 and says water channel 7,12 housing of third layer pipe
There is the 4th layer of pipe 11, forms subsidiary oxygen way 2, center oxygen channel 1 and subsidiary oxygen way 2 and two between third layer pipe 12 and the 4th layer of pipe 11
A runner interface is connected, and layer 5 pipe 10 is cased with outside the 4th layer of pipe 11, and the 4th layer forms pair between pipe 11 and layer 5 pipe 10
Oxygen road intake tunnel 3, layer 5 pipe 10 are cased with layer 6 pipe 9 outside, form subsidiary oxygen way between layer 5 pipe 10 and layer 6 pipe 9 and go out
Aquaporin-4, the roads the Zhu Yang intake tunnel 6 of center oxygen channel 1 say water channel 7 with main oxygen and are connected, the subsidiary oxygen way of subsidiary oxygen way 2
Intake tunnel 3 is connected with subsidiary oxygen way exhalant canal 4, by being weldingly connected between each layer pipe.Main oxygen hole 8 is mainly used to generate high
Fast oxygen jet stream carries out decarburizing reaction with ladle molten bath, blowing desulfurization agent can also carry out desulfurization as needed, 5 oxygen of subsidiary oxygen hole can
Second-time burning is formed with CO uprising gas to react, and temperature-compensating is carried out to molten steel of melting bath, reduces the temperature drop in vacuum process.
The main oxygen hole 2 is designed as vertical single hole or is arranged symmetrically on same level circumference for poriferous circular, porous
The quantity of main oxygen hole design is according to the different between 3~6 of processing ladle molten steel weight, the angle of main oxygen hole and vertical direction
Between 12~18 °.
The main oxygen hole of the top blast nozzle is Lavalle supersonic speed nozzle, and exit Mach number is 1.9~2.1, and aditus laryngis is straight
Diameter is calculated according to oxygen demand, and the spray orifice spacing of porous main oxygen hole is 1.0~1.4 times of spray orifice outlet diameters.
The subsidiary oxygen hole is that constant speed straight tube is designed and is centrosymmetrically arranged on same level circumference, according to ladle molten steel
The difference of weight is between 6~12, and the angle of subsidiary oxygen hole and vertical direction is between 30~45 °.
The subsidiary oxygen hole is dual channel double layer design, the vertical range of subsidiary oxygen hole entrance to main oxygen hole entrance 100~
Between 300mm.
In amount of oxygen distribution, oxygen flows primarily through main oxygen hole, and subsidiary oxygen hole accounts for the 10~20% of total oxygen demand.
Top-blown powder function may be implemented in the main oxygen hole, and desulfurization powder is blown to bath surface by main oxygen hole,
Reach further desulfurization effect.
Main oxygen hole is mainly used to provide O2And the high-speed jet that this Lavalle spray orifice generates is made to carry out carbon oxygen with ladle molten bath
Reaction, on main oxygen hole nozzle top, the symmetrical dual channel subsidiary oxygen hole of certain distance, can provide total tolerance 10~20%
O2The CO uprising gas generated with molten bath reaction between carbon and oxygen is sufficiently formed second-time burning and reacts, so as to further to ladle molten bath into
Trip temperature compensates.Main oxygen hole uses porous symmetric design mode, and porous nozzle can increase reaction interface product, while can also increase
Pulvis is uniformly blown to bath surface by main oxygen hole and reaches desulfurization effect by top-blown powder function.The utility model design
Dual channel top blast nozzle can improve post-combustion rate to 70~75%, substantially increase the utilization ratio of RH furnace heats.
The beneficial effects of the utility model are as follows：
(1) during vacuum decarburization, Oxygen Lance With Secondary Combustion promotes the abundant second-time burning of CO gases, compensates for molten steel in stove
The reduction of temperature makes molten steel cooling rate in vacuum process reduce.
(2) vacuum chamber lower part is fully heated by Oxygen Lance With Secondary Combustion, and the molten steel drop splashed is not easy to be attached on wall, has
Sticking for residual steel in vacuum chamber is inhibited to effect, avoids the excessive erosion of vacuum chamber.
(3) main oxygen hole of porous arrangement can increase top-blown powder function, be uniformly blown desulfurization powder by main oxygen hole and arrive
Bath surface reaches desulfurization effect.
Description of the drawings
Fig. 1 is that the dual channel design RH refining furnace top blast nozzles under the single hole main oxygen hole of the utility model face signal
Figure.
Fig. 2 is the vertical view signal of the dual channel design RH refining furnace top blast nozzles under the single hole main oxygen hole of the utility model
Figure.
Fig. 3 is that the dual channel design RH refining furnace top blast nozzles under the porous main oxygen hole of the utility model face signal
Figure.
Fig. 4 is the examination signal of bowing of the dual channel design RH refining furnace top blast nozzles under the porous main oxygen hole of the utility model
Figure.
In figure：Center oxygen channel 1, subsidiary oxygen way 2, subsidiary oxygen way intake tunnel 3, subsidiary oxygen way exhalant canal 4, subsidiary oxygen hole 5, master
Oxygen road intake tunnel 6, main oxygen say water channel 7, main oxygen hole 8, layer 6 pipe 9, layer 5 pipe 10, the 4th layer of pipe 11, third layer
Pipe 12, second layer pipe 13, central oxygen pipe 14.
Specific implementation mode
The use of the utility model is further described with reference to above-mentioned attached drawing.
The utility model include center oxygen channel 1, subsidiary oxygen way 2, subsidiary oxygen way intake tunnel 3, subsidiary oxygen way exhalant canal 4,
Subsidiary oxygen hole 5, the roads Zhu Yang intake tunnel 6, main oxygen say water channel 7, main oxygen hole 8, layer 6 pipe 9, layer 5 pipe 10, the 4th layer of pipe
11, third layer pipe 12, second layer pipe 13, central oxygen pipe 14.It is cased with second layer pipe 13 outside central oxygen pipe 14, central oxygen pipe 14 and the
The roads Zhu Yang intake tunnel 6 is formed between two layers of pipe 13, and third layer pipe 12, second layer pipe 13 and third layer are cased with outside second layer pipe 13
Main oxygen is formed between pipe 12 and says water channel 7, and the 4th layer of pipe 11, third layer pipe 12 and the 4th layer of pipe 11 are cased with outside third layer pipe 12
Between form subsidiary oxygen way 2, center oxygen channel 1 is connected with subsidiary oxygen way 2 with two runner interfaces, and the 4th layer of pipe 11 is cased with the outside
Five layers of pipe 10, the 4th layer forms subsidiary oxygen way intake tunnel 3 between pipe 11 and layer 5 pipe 10, layer 6 is cased with outside layer 5 pipe 10
Pipe 9, forms subsidiary oxygen way exhalant canal 4 between layer 5 pipe 10 and layer 6 pipe 9, the roads the Zhu Yang water inlet of center oxygen channel 1 is logical
Road 6 says water channel 7 with main oxygen and is connected, and the subsidiary oxygen way intake tunnel 3 of subsidiary oxygen way 2 is connected with subsidiary oxygen way exhalant canal 4, respectively
By being weldingly connected between layer pipe.Main oxygen hole 8 is mainly used to generate high speed oxygen jet stream and ladle molten bath progress decarburizing reaction, may be used also
Desulfurization is carried out with blowing desulfurization agent as needed, 5 oxygen of subsidiary oxygen hole can form second-time burning with CO uprising gas and react, to molten bath
Molten steel carries out temperature-compensating, reduces the temperature drop in vacuum process.
Fig. 1~Fig. 4 designs 2 kinds of embodiments of RH refining furnace top blast nozzles for dual channel.The oxygen that nozzle ejects point
For two parts, part of oxygen is ejected from main oxygen hole, and a part is ejected from subsidiary oxygen hole, due to using nozzle double fluid
Road mode designs, and the oxygen stream of the roads Zhu Yang and subsidiary oxygen way can be controlled individually, respectively suitable according to actual conditions selection
Flow rate zone, but secondary oxygen stream should not be too large or too small, and general pair oxygen stream accounts for the 10~20% of overall oxygen-supplying amount.The oxygen in the roads Zhu Yang
Stream is accelerated into supersonic airstream and rushes at molten steel face by the Lavalle nozzle of main oxygen hole, according to processing molten steel weight 50~
Difference between 300t, top blast nozzle main oxygen hole are arranged to single hole or 3~6 main oxygen holes, can reach oxygen jet and molten steel
Come into full contact with and react.The oxygen stream of subsidiary oxygen way keeps certain subsonic speed to enter in RH vacuum chambers by metal straight pipe, with
The abundant second-time burning of CO gases of rising.In order to make the CO gases of rising be fully used in vacuum chamber, especially by secondary oxygen
The outlet height in hole is arranged at 100~300mm distances above main oxygen hole outlet port, exists also according to processing molten steel weight
Difference between 50~300t, 6~12 symmetrical subsidiary oxygen holes of setting can fully improve the reaction in different size space
Efficiency.The spray gun of top blast nozzle connection starts top blast depth decarburization function in vacuum, by handling certain in RH refining furnaces
During 300t molten steel, as top blast nozzle oxygen blow duration about 5min, the post-combustion rate in RH refining furnaces can be made to improve
To 70~75%.In addition, when carrying out top-blown powder, subsidiary oxygen way must be closed at this time, and desulfurization powder enters ladle by main oxygen hole
Liquid level carries out deep desulphurization reaction.
In conclusion the utility model embodiment provides a kind of dual channel design RH refining furnace top blast nozzles, by adopting
With utility model device, the post-combustion rate in RH refining furnaces can be made to be increased to 70~75%, reached in RH refining furnaces
The compensation effect of liquid steel temperature, and then molten steel cooling rate in vacuum process is made to be reduced.In addition, second-time burning
It is sufficiently heated so that the molten steel drop that splashing is got up is not easy to be attached on the furnace wall of vacuum chamber, restrained effectively residual steel in vacuum chamber
Stick, avoids the excessive erosion of vacuum chamber.
Claims (5)
1. a kind of dual channel designs RH refining furnace top blast nozzles, which is characterized in that including center oxygen channel (1), subsidiary oxygen way
(2), subsidiary oxygen hole (5), main oxygen hole (8), layer 6 pipe (9), layer 5 pipe (10), the 4th layer of pipe (11), third layer pipe (12), the
Two layers of pipe (13), central oxygen pipe (14)；Second layer pipe (13), central oxygen pipe (14) and second layer pipe are cased with outside central oxygen pipe (14)
(13) Zhu Yang road intake tunnels (6) are formed between, are cased with third layer pipe (12) outside second layer pipe (13), second layer pipe (13) and the
Zhu Yang road exhalant canals (7) are formed between three-layer pipe (12), and the 4th layer of pipe (11), third layer pipe are cased with outside third layer pipe (12)
(12) subsidiary oxygen way (2), center oxygen channel (1) and subsidiary oxygen way (2) and two runner interfaces are formed between the 4th layer of pipe (11)
It is connected, layer 5 pipe (10) is cased with outside the 4th layer of pipe (11), forms secondary oxygen between the 4th layer of pipe (11) and layer 5 pipe (10)
Road intake tunnel (3), layer 5 pipe (10) are cased with layer 6 pipe (9) outside, are formed between layer 5 pipe (10) and layer 6 pipe (9)
The roads the Zhu Yang intake tunnel (6) of subsidiary oxygen way exhalant canal (4), center oxygen channel (1) is connected with the roads Zhu Yang exhalant canal (7)
Logical, the subsidiary oxygen way intake tunnel (3) of subsidiary oxygen way (2) is connected with subsidiary oxygen way exhalant canal (4), by welding phase between each layer pipe
Even.
2. dual channel according to claim 1 designs RH refining furnace top blast nozzles, it is characterised in that：The main oxygen hole
(8) it is designed as vertical single hole or is arranged symmetrically on same level circumference for poriferous circular, the quantity of porous main oxygen hole design is 3
Between~6, the angle of main oxygen hole and vertical direction is between 12~18 °.
3. dual channel according to claim 1 designs RH refining furnace top blast nozzles, it is characterised in that：The main oxygen hole
(8) it is Lavalle supersonic speed nozzle, exit Mach number is 1.9~2.1, and the spray orifice spacing of porous main oxygen hole is 1.0~1.4 times of sprays
Hole exits diameter.
4. dual channel according to claim 1 designs RH refining furnace top blast nozzles, it is characterised in that：The subsidiary oxygen hole
(5) it is that constant speed straight tube is designed and is centrosymmetrically arranged on same level circumference, according to the difference of ladle molten steel weight in quantity 6
Between~12, the angle of subsidiary oxygen hole (5) and vertical direction is between 30~45 °.
5. dual channel according to claim 1 designs RH refining furnace top blast nozzles, it is characterised in that：Subsidiary oxygen hole (5) is double
Runner double layer design, subsidiary oxygen hole export to the vertical range of main oxygen hole outlet between 100~300mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721260014 | 2017-09-28 | ||
| CN2017212600142 | 2017-09-28 |
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| Publication Number | Publication Date |
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| CN201820019176.5U Active CN207738801U (en) | 2017-09-28 | 2018-01-05 | A kind of dual channel design RH refining furnace top blast nozzles |
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