CN106048142B - A kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe - Google Patents
A kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe Download PDFInfo
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- CN106048142B CN106048142B CN201610662732.6A CN201610662732A CN106048142B CN 106048142 B CN106048142 B CN 106048142B CN 201610662732 A CN201610662732 A CN 201610662732A CN 106048142 B CN106048142 B CN 106048142B
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Abstract
The invention discloses a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipes, belong to molten steel furnace external refining technical field.The present invention includes tedge and down-comer, wherein the area of tedge upper bottom surface is more than the area of bottom surface, and the area of tedge horizontal cross-section gradually increase from the bottom to top axially along, the outer tube is rounding mesa-shaped hollow pipe, the area of the upper bottom surface of outer tube is more than the area of bottom surface, the top of central tube is fixedly connected with by fixed beam and outer tube, and central tube and outer tube are same axle center；Wherein：Central tube is tedge, and central tube is rounding mesa-shaped hollow pipe, and the area of the upper bottom surface of central tube is more than the area of bottom surface；Central tube is down-comer with the ring sleeve that outer tube is formed.Invention increases the saturation points of gas flow in molten steel, not only increase circular flow, and improve distribution of the gas in flow field of molten steel, so as to improve the refining effect of molten steel.
Description
Technical field
The present invention relates to molten steel furnace external refining technical field, more specifically to a kind of RH vacuum refining furnaces round platform
Shape sleeve dip pipe.
Background technology
RH methods are the one of Rule iron company of West Germany (Ruhrstahl) and the exploitation of He Laousi (Hereaeus) Joint Designing
Kind molten steel secondary refining method[1].RH methods are the important means of external refining, have degassing, decarburization, deoxidation and uniform steel
The effects that liquid ingredient and temperature, promotion non-metallic inclusion floats.RH vacuum refining furnaces lower part is provided with dip pipe, RH vacuum fines
During furnace refining liquid steel, first the dipping tube of lower part is inserted into the lower part of ladle molten steel face, and vacuum chamber take out true
Sky is then blown into argon gas as driving gas so that the apparent density of molten steel in tedge in the lower part of tedge into molten steel
It is smaller than the density in down-comer, and under the drive of argon gas bubbles, the molten steel in tedge ascends into vacuum with argon gas bubbles
Room, so as to be de-gassed, decarburization, deoxygenation, in a vacuum chamber refine after the completion of, the molten steel in vacuum chamber is under the effect of gravity
It is flowed back into ladle from down-comer.
Since in RH vacuum refining process, molten steel is followed by being constantly recycled in ladle into vacuum chamber in ladle
Ring refines.Therefore, the circular flow of RH vacuum refining furnaces is the important indicator for weighing refining effect.Circular flow directly affects
The speed and effect of the purifying reactions such as molten steel degassing, decarburization, desulfurization, and molten steel component and equalizing temperature are limit, so following
Circulation is the key link for limiting RH vacuum refining furnace refining effects.Existing researcher is mainly by improving refining furnace
Circular flow come improve improve RH vacuum refining furnaces refining effect.Circular flow (Q) can be represented by following empirical equation：
Wherein：G is gas supply flow (unit：m3/min)；D is dipping pipe diameter (unit：m)；PoFor atmospheric pressure (unit：
Pa)；P is vacuum chamber residual pressure (unit：Pa)
It can be obtained by empirical equation, circular flow is positively correlated with gas supply flow and dipping pipe diameter, i.e. circular flow
Increase with the increase of gas supply flow and dipping pipe diameter；Circular flow is negatively correlated with vacuum chamber residual pressure, recycle stream
Amount increases with the reduction of vacuum chamber residual pressure.Therefore, increase gas supply flow, stain pipe diameter and reduce vacuum chamber residual pressure
It is the main path for increasing RH vacuum refining furnace circular flows.But above-mentioned approach has the following problems：1) increase gas supply flow
Although increasing circular flow to a certain extent, when gas supply flow is larger, large percentage that gas volume accounts for so that gas
The drawing ratio of bubble declines, and reduces the circular flow of molten steel instead；2) dipping pipe diameter is limited by ladle size, works as ladle
Size has determined, then dip pipe diameter is just difficult to further increase；3) vacuum chamber needs to consume a large amount of energy,
If continuing through reduces vacuum chamber residual pressure to improve circular flow be uneconomic.The technical issues of above-mentioned, limits RH
The increase of vacuum refining furnace molten steel circular flow, there is an urgent need to seek suitable solution from technology and economic angle,
So as to improve the refining effect of RH vacuum refining furnaces, reach molten steel high efficiency and the dual purpose of low cost refining.
Through retrieval, there is relevant technical solution to disclose.Wherein：The integral type dip pipe of RH equipment for vacuum refining is (specially
Profit number：ZL201320106192.5, the day for announcing：2013.07.31)[2], by cancel dip pipe tedge and down-comer it is resistance to
Gap between fire lining so that under conditions of the size of main body for keeping RH equipment for vacuum refining is constant, increase tedge is under
The internal diameter of pipe is dropped, and then increases circular flow.But this method is extremely limited to the increase of circular flow.In addition, innovation and creation
Title：Dip pipe (the patent No. used in RH equipment for vacuum refining：ZL201410091028.0, date of publication：2014.06.04),
Telescopic dip pipe (the patent No. used in RH equipment for vacuum refining：ZL201410090574.2, the day for announcing：2014.06.18)[3-4],
Dip pipe is set as telescopic by above-mentioned technical proposal, so as to increase the diameter of dip pipe, to increase circular flow.By document
It can be found that in order to improve the refining effect of RH vacuum refining furnaces, existing technical staff, which has formd, passes through increase for retrieval
The diameter of dip pipe improves the mindset of circular flow.
Bibliography：
[1] application of Wang Peng .RH external refinings and research [C] // Chinese Metals Society youth Annual Conference .2010.
[2] the integral type dip pipe of Zhongye Saidi Engineering Technology Co., Ltd .RH equipment for vacuum refining：China,
ZL201320106192.5[P].2013.07.31.
[3] dip pipe used in Northeastern University .RH equipment for vacuum refining：China, ZL201410091028.0 [P]
.2014.06.04.
[4] telescopic dip pipe used in Northeastern University .RH equipment for vacuum refining：China, ZL201410090574.2 [P]
.2014.06.18.
Invention content
1. technical problems to be solved by the inivention
It is an object of the invention to overcome in the prior art, circular flow is the pass for limiting RH vacuum refining furnace refining effects
Key link, existing method are difficult to effectively improve the deficiency of the circular flow of RH purifying methods, provide a kind of RH vacuum refining furnaces
With truncated cone-shaped sleeve dip pipe, realize that the circular flow of RH vacuum refining furnaces significantly increases, and significantly improve RH vacuum refining furnaces
Refining effect.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
A kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe of the present invention, including tedge and down-comer, wherein on
The area of riser upper bottom surface is more than the area of bottom surface, and the area of tedge horizontal cross-section is gradual from the bottom to top axially along
Increase, the area of the tedge horizontal cross-section is the continuous function about tedge axial height.Said program has as follows
Technique effect：
The area of tedge upper bottom surface is more than the area of bottom surface, so as to not change existing RH equipment for vacuum refining to steel
In the case of packet condition of compatibility, increase the circulation area of RH vacuum refining furnace dip pipe molten steel, so as to increase vacuum circulation degassing
The circular flow of device RH, to improve the refining effect of RH vacuum refining furnaces.
Further, including central tube and outer tube, the outer tube is rounding mesa-shaped hollow pipe, outer tube it is upper
The area of bottom surface is more than the area of bottom surface, and the top of the central tube is fixedly connected with by fixed beam and outer tube, and center
Pipe and outer tube are same axle center；Wherein：The central tube be tedge, and central tube be rounding mesa-shaped hollow pipe, center
The area of the upper bottom surface of pipe is more than the area of bottom surface；Central tube is down-comer with the ring sleeve that outer tube is formed.Above-mentioned side
Case has the following technical effect that：
1) central tube and outer tube form sleeve dip pipe, and central tube is tedge, central tube and the ring of outer tube composition
Shape casing is down-comer, and dip pipe is set as sleeve shaped and is adapted to ladle mouth, so as to take full advantage of the diameter of ladle mouth, is increased
The big diameter of dip pipe, to improve the circular flow of RH vacuum refining furnaces；
2) central tube is rounding mesa-shaped hollow pipe, and the area of the upper bottom surface of central tube is more than the area of bottom surface, so as to make
The area for obtaining the upper bottom surface of tedge is more than the area of bottom surface, increases the circulation area of dip pipe molten steel, thus can increase true
The circular flow of idle loop degasser RH；And from down to up along central tube axis direction, the face of the horizontal cross-section of tedge
Product gradually increase so that the gas in molten steel is gradually reduced in uphill process by the pressure of molten steel, and gas is formed in molten steel
The volume of bubble gradually increase, so as to increase the saturation point of gas flow in molten steel, not only increase circular flow, and
Distribution of the gas in flow field of molten steel is improved, degassing, decarburization, deoxygenation occurs so as to promote molten steel；
3) central tube is rounding mesa-shaped hollow pipe, so that tedge is lower thin and upper thick, stream of the molten steel in tedge
Logical area gradually increases from the bottom to top, from tedge to vacuum chamber in produce circulation flow field from center to edge, so as to make
The Flow Field Distribution for obtaining the molten steel of tedge is more reasonable so that bubble, into distribution is diffused, increases bubble and molten steel in molten steel
Contact area, bubble molten steel rise during meet molten steel degassing dynamic conditions, be molten steel degassing, decarburization, take off
Oxygen reaction provides guarantee, and good dynamic conditions is created for reactions such as non-metallic inclusion floatings；In addition, it greatly reduces true
Dead zone area in empty room so that molten steel component and temperature are uniform and stable.
4) area of the upper bottom surface of central tube is more than the area of bottom surface, and molten steel is risen to the process at top by tedge
In, since the area of section of tedge gradually increases, so that flow velocity of the molten steel at the top of dip pipe is smaller, so as to reduce
Molten steel washes away center tube wall face, improves the service life of dip pipe.
Further, the cone angle of the central tube is 5-30 °.Said program has the following technical effect that：
The cone angle of central tube is 5-30 °, and appropriate cone angle causes the area of the upper bottom surface of tedge to be more than the face of bottom surface
Product, so that the Flow Field Distribution of the molten steel of tedge is more reasonable, meets the dynamic conditions of liquid steel refining.
Further, be provided on the outer wall of the top of the outer tube and the horizontal corresponding position of fixed beam lower floor into
Gas port and upper strata air inlet, wherein lower floor's air inlet are located at the lower section of upper strata air inlet；Center inside pipe wall is provided with underlying nozzle
With upper strata nozzle, the underlying nozzle and upper strata nozzle are located on two different horizontal planes, and where underlying nozzle
The lower section of horizontal plane, lower floor's air inlet pass through lower floor's gas-guide tube and underlying nozzle phase where horizontal plane is located at upper strata nozzle
Connection, upper strata air inlet are connected by upper strata gas-guide tube with upper strata nozzle.Said program has the following technical effect that：
Center inside pipe wall is provided with underlying nozzle and upper strata nozzle, and underlying nozzle and upper strata nozzle pass through gas-guide tube respectively
It is connected with lower floor's air inlet and upper strata air inlet so that underlying nozzle and upper strata nozzle can be adopted according to the difference of refining condition
With different gas supply systems, and pass through the gas supply system for changing underlying nozzle and upper strata nozzle, can effectively control in tedge
Flow Field Distribution, while circular flow is promoted, can further control the Flow Field Distribution in molten steel, so as to improve molten steel essence
Reaction condition during refining.
Further, 2-6 underlying nozzle, center inside pipe wall are uniformly distributed on the center inside pipe wall circumference
6-10 upper strata nozzle is uniformly distributed on circumference.Said program has the following technical effect that：
Underlying nozzle quantity is less than the quantity of upper strata nozzle, so as to adequately using the space in dip pipe, be obviously improved
Gas flow saturation point dramatically increases the gas flow in tedge, and this plenum system significantly extends bubble in molten steel
In flowing stroke, improve the power of agitator of gas.
Further, lower annular gas-guide tube and upper annular gas-guide tube, the lower ring are provided in the central tube
Shape gas-guide tube is located at underlying nozzle in same level, and lower floor's gas-guide tube is connected by lower annular gas-guide tube with underlying nozzle
Logical, the upper annular gas-guide tube is located at upper strata nozzle in same level, upper strata gas-guide tube by upper annular gas-guide tube and
Upper strata nozzle is connected.
Lower annular gas-guide tube and upper annular gas-guide tube are respectively underlying nozzle and upper strata nozzle gas supply, so as to ensure that gas supply
Uniformity so that the gas in the underlying nozzle and upper strata nozzle of center inside pipe wall can uniformly, steadily spurt into rising
Guan Zhong so as to ensure that uniform stirring of the gas to molten steel of underlying nozzle and upper strata nozzle, and prevents the molten steel in tedge
Bias current occurs.
Further, distance of the underlying nozzle away from upper bottom surface is 5-8 times away from bottom surface distance.
The centrally disposed inside pipe wall lower part of underlying nozzle, so as to effectively the molten steel in tedge be pushed to be transported into vacuum chamber
It is dynamic, the circular flow of RH vacuum refining furnaces is improved, the smelting speed of RH vacuum refining furnaces is accelerated, improves metallurgical effect.
Further, the underlying nozzle and upper strata nozzle are three-port type nozzle, and the angle b between Kong Yukong is
120°。
Further, the three-port type nozzle includes 2 air holes and 1 upper stomata, and air holes is a diameter of
3-5mm, a diameter of 4-6mm of upper stomata.
The three-port type nozzle of different-diameter can refine the bubble being blown into molten steel, and it is same that molten steel is made to increase in tedge
When rotate, so as to reduce dead zone area in tedge and vacuum chamber, improve refining effect.
Further, the fixed beam is set as 4-8.
3. advantageous effect
Using technical solution provided by the invention, compared with existing known technology, there is following remarkable result：
(1) a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe of the invention, central tube are rounding mesa-shaped hollow pipe,
The area of the upper bottom surface of central tube is more than the area of bottom surface, so that the area of the upper bottom surface of tedge is more than bottom surface
Area, increases the circulation area of dip pipe molten steel, thus can increase the circular flow of vacuum circulating degasser RH；And it is arrived by down
On gradually increase along center pipe axle line direction, the area of the horizontal cross-section of tedge so that the gas in molten steel was rising
It is gradually reduced in journey by the pressure of molten steel, the volume for the bubble that gas is formed gradually increases in molten steel, so as to increase molten steel
The saturation point of middle gas flow not only increases circular flow, and improves distribution of the gas in flow field of molten steel, promotes
Degassing, decarburization, deoxygenation occur for molten steel；
(2) a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe of the invention, central tube are rounding mesa-shaped hollow pipe,
So that tedge is lower thin and upper thick, circulation area of the molten steel in tedge gradually increases from the bottom to top, from tedge to
The circulation flow field from center to edge is produced in vacuum chamber, so that the Flow Field Distribution of the molten steel of tedge is more reasonable,
So that bubble in molten steel into distribution is diffused, increase the contact area of bubble and molten steel so that the mistake that bubble rises in molten steel
Meet the dynamic conditions of molten steel degassing in journey, be molten steel degassing, decarburization, deoxygenation, be that non-metallic inclusion floating etc. is anti-
Good dynamic conditions should be created；In addition, greatly reduce dead zone area in vacuum chamber so that molten steel component and temperature are uniform
Stablize；
(3) a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe of the invention, center inside pipe wall are provided with lower floor's spray
Mouth and upper strata nozzle, and underlying nozzle and upper strata nozzle are connected respectively by gas-guide tube with lower floor's air inlet and upper strata air inlet
It is logical so that underlying nozzle and upper strata nozzle using different gas supply systems, and can pass through under change according to the difference of refining condition
The gas supply system of layer nozzle and upper strata nozzle, can effectively control the Flow Field Distribution in tedge, promote the same of circular flow
When, the Flow Field Distribution in molten steel can be further controlled, so as to improve the reaction condition during liquid steel refining.Underlying nozzle number
Amount, so as to adequately utilize the space in dip pipe, is obviously improved gas flow saturation point, significantly less than the quantity of upper strata nozzle
Increase the gas flow in tedge, and this plenum system significantly extends movement travel of the bubble in molten steel, so as to carry
The power of agitator of high gas；
(4) a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe of the invention, lower annular gas-guide tube and upper annular are led
Tracheae is respectively underlying nozzle and upper strata nozzle gas supply, so as to ensure that the uniformity of gas supply so that the lower floor of center inside pipe wall
Gas in nozzle and upper strata nozzle uniformly, can be spurted into steadily in tedge, so as to ensure that underlying nozzle and upper strata
The gas of nozzle prevents the molten steel in tedge from bias current occurs the uniform stirring of molten steel.
Description of the drawings
Fig. 1 is the dimensional structure diagram of the truncated cone-shaped sleeve dip pipe of the present invention；
Fig. 2 is the cross-sectional view of the truncated cone-shaped sleeve dip pipe of the present invention；
Fig. 3 is horizontal sectional view of the central tube of the present invention at underlying nozzle；
Fig. 4 is horizontal sectional view of the central tube of the present invention at the nozzle of upper strata；
Fig. 5 is the structure diagram of the underlying nozzle of the present invention；
Fig. 6 is the cross-sectional view of the underlying nozzle of the present invention；
Fig. 7 is the overall structure diagram of the RH vacuum refining systems of the present invention；
Fig. 8 is the structure diagram of the RH vacuum refining furnaces of the present invention；
Fig. 9 is the flow chart of the liquid steel refining method of the present invention.
Label declaration in schematic diagram：
100th, central tube；111st, underlying nozzle；112nd, upper strata nozzle；121st, lower floor's gas-guide tube；122nd, upper strata gas-guide tube；
131st, lower floor's air inlet；132nd, upper strata air inlet；141st, lower annular gas-guide tube；142nd, upper annular gas-guide tube；151st, air holes；
152nd, upper stomata；200th, outer tube；300th, fixed beam；400th, vacuum chamber；401st, flange；500th, ladle seat；501st, ladle；610、
First feeder；611st, lower floor's steam supply valve；620th, the second feeder；621st, upper strata steam supply valve；700th, vacuum pump；701st, it is true
Empty valve；702nd, exhaust tube；800th, alloy hopper.
Specific embodiment
To further appreciate that present disclosure, with reference to embodiment, the invention will be further described.
Embodiment 1
With reference to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, a kind of RH vacuum refinings of the present embodiment
Stove truncated cone-shaped sleeve dip pipe, including tedge and down-comer, the wherein area of tedge upper bottom surface is more than the face of bottom surface
Product, wherein the tedge upper bottom surface is the horizontal cross-section at the top of tedge, tedge bottom surface is the level of riser bottom
Section, and gradually increase, the area of tedge horizontal cross-section are the area of tedge horizontal cross-section from the bottom to top axially along
About the continuous function of tedge axial height, the area of down-comer upper bottom surface is more than the area of bottom surface, similary down-comer water
The gradually increase from the bottom to top axially along of the area of plane section.Dip pipe includes central tube 100 and outer tube 200, described
Outer tube 200 is rounding mesa-shaped hollow pipe, and the area of the upper bottom surface of outer tube 200 is more than the area of bottom surface, the center
The top of pipe 100 is fixedly connected with by fixed beam 300 and outer tube 200, and the fixed beam 300 is set as 4, fixed beam 300
Between angle be 90 °, and central tube 100 and outer tube 200 are same axle center, and the cone angle of central tube 100 is 20 °, housing
The cone angle of pipe 200 is also 20 °, the angle centered on above-mentioned cone angle between pipe 100 and outer tube 200 shaft section, two busbares；
Wherein：The central tube 100 is tedge, and central tube 100 is rounding mesa-shaped hollow pipe, the upper bottom surface of central tube 100
Area is more than the area of bottom surface；Central tube 100 is down-comer with the ring sleeve that outer tube 200 is formed.So that rise
The area of pipe upper bottom surface is more than the area of bottom surface, so as to not change existing RH vacuum refining furnaces to 501 condition of compatibility of ladle
In the case of, the circulation area of increase RH vacuum refining furnace dip pipe molten steel, so as to increase following for vacuum circulating degasser RH
Circulation, to improve the refining effect of RH vacuum refining furnaces.
Central tube 100 and outer tube 200 form sleeve dip pipe, and central tube 100 is tedge, central tube 100 and housing
The ring sleeve that pipe 200 is formed for down-comer, dip pipe be set as sleeve shaped and with ladle 501 mouthfuls be adapted to, so as to make full use of
The diameter of 501 mouthfuls of ladle, in the case where 501 diameter of ladle is identical, increases the diameter of dip pipe, to carry to the greatest extent
The circular flow of high RH vacuum refining furnaces.Central tube 100 is rounding mesa-shaped hollow pipe, and the area of the upper bottom surface of central tube 100 is big
In the area of bottom surface, so that the area of the upper bottom surface of tedge is more than the area of bottom surface, increase dip pipe molten steel
Circulation area, thus the circular flow of vacuum circulating degasser RH can be increased；And from down to up along 100 axis side of central tube
To the area of the horizontal cross-section of tedge gradually increases so that the gas in molten steel is in uphill process by the pressure of molten steel
It being gradually reduced, the volume for the bubble that gas is formed gradually increases in molten steel, so as to increase the saturation point of gas flow in molten steel,
Circular flow is not only increased, and improves distribution of the gas in flow field of molten steel, so as to promote molten steel degassing, go to be mingled with
The generation of reaction；Circulation area of the molten steel in tedge gradually increases from the bottom to top, 400 from tedge to vacuum chamber in generate
Circulation flow field from center to edge, so that the Flow Field Distribution of the molten steel of tedge is more reasonable so that bubble is in steel
Liquid meets the dynamic conditions of molten steel degassing during rising, be molten steel degassing, decarburization, deoxidation, non-metallic inclusion floating
Reactions is waited to create good dynamic conditions；In addition, greatly reduce dead zone area in vacuum chamber 400 so that molten steel component and
Temperature is uniform and stable.
In addition, the area of the upper bottom surface of central tube 100 is more than the area of bottom surface, molten steel rises to top by tedge
In the process, since the area of section of tedge gradually increases so that flow velocity of the molten steel at the top of dip pipe is smaller, so as to reduce
Molten steel washes away 100 wall surface of central tube, so as to improve the service life of dip pipe.Central tube 100 is formed with outer tube 200
Ring sleeve for down-comer, the area of down-comer upper bottom surface is more than the area of bottom surface so that the liquid level of down-comer decline with
Tedge keeps cooperation, improves distribution of the gas in flow field of molten steel, promotes molten steel and degassing, decarburization, desulphurization reaction occurs.
Be provided on the top of the outer tube 200 of the present embodiment and the outer wall of 300 horizontal corresponding position of fixed beam lower floor into
Gas port 131 and upper strata air inlet 132, wherein lower floor's air inlet 131 are located at the lower section of upper strata air inlet 132；100 inner wall of central tube
Underlying nozzle 111 and upper strata nozzle 112 are provided with, the underlying nozzle 111 and upper strata nozzle 112 are different positioned at two
On horizontal plane, and the horizontal plane where underlying nozzle 111 is located at the lower section of 112 place horizontal plane of upper strata nozzle, the lower floor
Air inlet 131 is connected by lower floor's gas-guide tube 121 with underlying nozzle 111, and upper strata air inlet 132 passes through upper strata gas-guide tube 122
It is connected with upper strata nozzle 112.100 inner wall of central tube is provided with underlying nozzle 111 and upper strata nozzle 112, and underlying nozzle 111
It is connected respectively by gas-guide tube with lower floor air inlet 131 and upper strata air inlet 132 with upper strata nozzle 112, i.e. underlying nozzle 111
It is connected by gas-guide tube with lower floor air inlet 131, upper strata nozzle 112 is connected by gas-guide tube with upper strata air inlet 132.Make
Obtain underlying nozzle 111 and upper strata nozzle 112 using different gas supply systems, and can pass through lower floor according to the difference of refining condition
The gas supply system of nozzle 111 and upper strata nozzle 112, efficiently controls the Flow Field Distribution in tedge, is promoting circular flow
Meanwhile Flow Field Distribution in molten steel can be further controlled, improve the reaction condition during liquid steel refining.
4 underlying nozzles 111,100 inner wall of central tube are uniformly distributed on the 100 inner wall circumference of central tube of the present embodiment
8 upper strata nozzles 112 are uniformly distributed on circumference, distance of the underlying nozzle 111 away from 100 upper bottom surface of central tube is away from bottom surface
7 times of distance, the vertical range between underlying nozzle 111 and upper strata nozzle 112 are 200mm.Moreover, underlying nozzle 111 and upper
Layer nozzle 112 is interspersed, i.e. the projection of underlying nozzle 111 and upper strata nozzle 112 on bottom surface is interspersed, and appoints
The line of meaning underlying nozzle 111 and arbitrary upper strata nozzle 112 is all without the center of circle on perspective plane.111 quantity of underlying nozzle is less than
The quantity of upper strata nozzle 112, and the supply gas pressure of underlying nozzle 111 is more than upper strata nozzle 112,111 quantity of underlying nozzle is few, supplies
Atmospheric pressure is big, for rise bottom of the tube molten steel strong lifting power is provided, push molten steel by rising bottom of the tube it is rapid on
Vacuum chamber 400 is risen to, so as to increase circular flow.The supply gas pressure of 8 upper strata nozzles 112 is smaller, so that upper strata is sprayed
The gas that mouth 112 sprays can be adequately spread in molten steel, so as to significantly increase the saturation air-blowing quantity in molten steel, and increase RH
Circular flow.8 upper strata nozzles 112 are interspersed with 4 above-mentioned underlying nozzles 111, while circular flow is promoted,
The Flow Field Distribution in molten steel can be further controlled, improves the reaction condition during liquid steel refining.
Lower annular gas-guide tube 141 and upper annular gas-guide tube 142, the lower annular gas-guide tube are provided in central tube 100
141 are located at underlying nozzle 111 in same level, and lower floor's gas-guide tube 121 passes through lower annular gas-guide tube 141 and underlying nozzle
111 are connected, and upper annular gas-guide tube 142 is located at upper strata nozzle 112 in same level, and upper strata gas-guide tube 122 passes through upper ring
Shape gas-guide tube 142 is connected with upper strata nozzle 112.Lower annular gas-guide tube 141 and upper annular gas-guide tube 142 are respectively underlying nozzle
111 and upper strata nozzle 112 supply, ensure that the uniformity of gas supply so that the underlying nozzle 111 of 100 inner wall of central tube and upper strata
Gas in nozzle 112 uniformly, can be spurted into steadily in tedge, ensure that underlying nozzle 111 and upper strata nozzle 112
Gas prevents the molten steel in tedge from bias current occurs the uniform stirring of molten steel.
The underlying nozzle 111 of the present embodiment is three-port type nozzle, including 2 air holes 151 and 1 upper stomata 152, and
A diameter of 4mm of air holes 151, a diameter of 5mm of upper stomata 152, and the angle b between Kong Yukong is 120 °, three-port type spray
Air holes 151 and upper stomata 152 on mouth are uniformly distributed, and upper strata nozzle 112 is identical with the structure of underlying nozzle 111.Three
Hole type nozzle is conducive to form rational Flow Field Distribution in tedge, and hole type nozzle can refine the bubble being blown into molten steel, be
Degassing, decarburization provide advantage；In addition, upper stomata 152 and the angle c of horizontal direction are 20 °, and tilt upward.It blows
Argon gas is sprayed by upper stomata 152 in molten steel in the process, along the angle direction from the horizontal by 20 °, sprays into rise obliquely
In the molten steel of pipe, power is risen to, and push the molten steel in tedge quickly upward so as to be provided for molten steel, so as to improve
Circular flow.Air holes 151 is horizontal direction, and gas is by being blown into molten steel in 151, the collocation of air holes 151 and upper stomata 152
It uses so that molten steel generation rotary force, so as to rotate while molten steel is made to increase in tedge, promotes molten steel
Stirring, reduces dead zone area in tedge and vacuum chamber 400, extends flowing stroke of the bubble in molten steel, accelerates refining
Speed.
A kind of RH vacuum refining systems of the present embodiment, including RH vacuum refining furnaces, ladle seat 500, the first feeder
610th, the second feeder 620, vacuum pump 700 and alloy hopper 800, RH vacuum refining furnaces lower part are provided with ladle seat 500, steel
Be provided with ladle 501 on back stall 500, the RH vacuum refining furnaces by gas pipeline respectively with the first feeder 610 and
Second feeder 620 is connected, and vacuum pump 700 is connected by exhaust tube 702 with RH vacuum refining furnaces top, the alloy material
Bucket 800 at the top of charge pipe and RH vacuum refining furnaces by being connected.
Above-mentioned RH vacuum refining furnaces, including vacuum chamber 400 and dip pipe, the bottom of vacuum chamber 400 is equipped with flange 401,
400 bottom of vacuum chamber is provided with upper flange plate, and the laxative remedy being adapted with above-mentioned upper flange plate is provided at the top of dip pipe
Blue disk, for 400 bottom of vacuum chamber by being connected at the top of flange 401 and dip pipe, dip pipe includes central tube 100 and outer tube 200,
The outer tube 200 is rounding mesa-shaped hollow pipe, and the area of the upper bottom surface of outer tube 200 is more than the area of bottom surface, described
The top of central tube 100 be fixedly connected with by fixed beam 300 and outer tube 200, and central tube 100 and outer tube 200 are same
Axle center；Wherein：Central tube 100 be tedge, and central tube 100 be rounding mesa-shaped hollow pipe, the face of the upper bottom surface of central tube 100
Product is more than the area of bottom surface；Central tube 100 is down-comer with the ring sleeve that outer tube 200 is formed.
Vacuum pump 700 is connected by exhaust tube 702 with 400 top of vacuum chamber, and the first feeder 610 passes through gas pipeline
It is connected with lower floor air inlet 131, the second feeder 620 is connected by gas pipeline with upper strata air inlet 132.First gas supply dress
Put 610 and second feeder 620 it is corresponding supplied for underlying nozzle 111 and upper strata nozzle 112, the first feeder
610 provide argon gas for underlying nozzle 111, and the second feeder 620 provides argon gas for upper strata nozzle 112.Can effectively it regulate and control
The gas supply flow of underlying nozzle 111 and upper strata nozzle 112, and the gas supply flow by regulating and controlling underlying nozzle 111 is more than upper strata
The gas supply flow of nozzle 112 so that the Argon Bubble that underlying nozzle 111 and upper strata nozzle 112 spray into is spread in molten steel, is increased
The saturation air-blowing quantity of molten steel.
Vacuum valve 701, the first feeder 610 are provided on exhaust tube 702 between vacuum pump 700 and vacuum chamber 400
Be provided with lower floor's steam supply valve 611 on gas pipeline between lower floor air inlet 131, second feeder 620 with it is upper
Upper strata steam supply valve 621 is provided on gas pipeline between layer air inlet 132.Vacuum valve 701 is controlling the pumping of vacuum chamber 400
Vacuum process, lower floor's steam supply valve 611 and upper strata steam supply valve 621 are respectively controlling the first feeder 610 and the second gas supply dress
Put 620 gas supply flow.
By taking IF steel as an example, as shown in figure 9, a kind of liquid steel refining method using RH vacuum refining systems of the present invention, tool
The step of body is：
Step 1：Pretreatment
(1) open lower floor steam supply valve 611, argon gas provided for underlying nozzle 111 by the first feeder 610, argon gas by
First feeder 610 enters lower floor's air inlet 131, and underlying nozzle 111 is reached, and by underlying nozzle through lower floor's gas-guide tube 121
111 spray into molten steel, and the argon gas gas supply flow of the first feeder 610 is：0.4m3/min；Upper strata steam supply valve 621 is opened,
Argon gas is provided for upper strata nozzle 112 by the second feeder 620, argon gas enters upper strata air inlet by the second feeder 620
132, upper strata nozzle 112 is reached, and sprayed into molten steel by upper strata nozzle 112, and the second feeder through upper strata gas-guide tube 122
620 argon gas gas supply flow is：0.2m3/min；
(2) ladle 501 is constantly lifted with the promotion of ladle seat 500, and dip pipe is immersed molten steel liquid level hereinafter, dip pipe
The depth immersed below molten steel liquid level is 600mm, and C mass concentrations are 350 × 10 wherein in molten steel-6, O mass fractions for 600 ×
10-6, molten steel mean temperature is 1590 DEG C.
Step 2：Vacuum refining
(1) open the vacuum valve 701 of exhaust tube 702, using vacuum pump 700 to the vacuum chambers 400 of RH vacuum refining furnaces into
Row vacuumize process；
(2) continue to vacuumize, when the pressure of the vacuum chamber 400 of RH vacuum refining furnaces is 5000Pa, adjust the first gas supply
The argon gas gas supply flow of device 610 is：0.8m3/min；The argon gas gas supply flow of second feeder 620 is：0.5m3/min；When
When the pressure of the vacuum chamber 400 of RH vacuum refining furnaces is 1500Pa, after vacustat, the argon of the first feeder 610 is adjusted
Gas gas supply flow is：1.2m3/min；The argon gas gas supply flow of second feeder 620 is：0.8m3/min；Tedge upper bottom surface
Area be more than bottom surface area, and the area of tedge horizontal cross-section axially along from the bottom to top gradually increase, molten steel
Vacuum chamber 400 is flowed by continuous in tedge under the driving of argon gas, under gravity the molten steel of vacuum chamber 400 by
It is constantly back in ladle 501 in down-comer, molten steel is made to generate cycle；
Decarburization：During ladle 501 and vacuum chamber 400 recycle, carbon and oxygen in molten steel react to form CO molten steel, and
It is discharged by vacuum pump 700, if the oxygen content in molten steel is inadequate, oxygen blast can be carried out by the oxygen rifle of RH vacuum refining furnaces, and
Oxygen decarburization is provided；Deoxidation：At the end of decarburization, aluminum shot is added in into the molten steel of vacuum chamber 400 from alloy hopper 800 and taken off
Oxygen.
Step 3：Alloying
Alloy raw material is added in into the molten steel of vacuum chamber 400 carry out alloying after deoxidation from alloy hopper 800.
The alloy raw material added in alloying process is ilmenite, and after alloying is completed, detection molten steel component contains for middle C
Measure is 30 × 10-6, O content is 20 × 10-6, Ti contents are 200 × 10-6When, molten steel reaches target component and temperature then completes steel
Liquid refines, and stops vacuum pump 700 and vacuumizes carry out vacuum breaker, while vacuum chamber 400 is pressed again, again in atmospheric pressure state, steel
Back stall 500 slowly moves down, and ladle 501 is gradually reduced with ladle seat 500, completes liquid steel refining.
The RH equipment for vacuum refining (as shown in Figure 8) of the present embodiment, the internal diameter D3 of ladle 501 is 3212mm, of the invention
The internal diameter D2 of vacuum chamber 400 is 2409mm；The internal diameter D1 of dip pipe outer tube 200 is 1506mm；The internal diameter D0 of central tube 100 is
750mm；200 wall thickness of outer tube is 260mm, and 100 wall thickness of central tube is 200mm, and the height of central tube 100 and outer tube 200 is
1000mm；The gas supply flow (G) of the present embodiment RH vacuum refining furnaces is 2.0m3·min-1, i.e. the first feeder 610 and second
The sum of gas supply flow (G) of feeder 620 is 2.0m3·min-1, wherein the gas supply flow of the first feeder 610 is
1.2m3·min-1, the gas supply flow of the second feeder 620 is 0.8m3·min-1, circular flow (Q) is 190tmin-1, take off
The carbon time is 22.0min.Since the area of tedge upper bottom surface is more than the area of bottom surface, so as to not change existing RH vacuum
In the case that purifier is to 501 condition of compatibility of ladle, increase the circulation area of RH vacuum refining furnace dip pipe molten steel, so as to increase
The circular flow of big vacuum circulating degasser RH, to improve the refining effect of RH vacuum refining furnaces.The horizontal cross-section of tedge
Area gradually increase so that the gas in molten steel is gradually reduced in uphill process by the pressure of molten steel, gas in molten steel
The volume of the bubble of formation gradually increases, and so as to increase the saturation point of gas flow in molten steel, not only increases circular flow,
And distribution of the gas in flow field of molten steel is improved, so as to promote the rate that decarburizing reaction occurs for molten steel, reduce decarburization
Time, shorten smelting cycle.
Comparative example 1
The tedge and down-comer of the RH vacuum refining furnaces of comparative example 1 are to be provided separately, as general RH vacuum refinings
Stove, the internal diameter D3 of ladle 501 is 3012mm, and dip pipe rises bore as 550mm, the gas supply flow of existing RH vacuum refining furnaces
(G) it is 2.0m3·min-1, when the pressure of vacuum chamber 400 is 500Pa, circular flow (Q) is 130tmin-1, decarburization time is：
30.0min。
Comparative example 2
The substance of comparative example 2 leads to embodiment 1, the difference is that：The tedge of RH vacuum refining furnaces and decline
It manages as cylindrical shape, the dip pipes of RH vacuum refining furnaces includes central tube 100 and outer tube 200, tedge in central tube 100, in
The intermediate region of heart pipe 100 and outer tube 200 is the area phase of down-comer, the i.e. upper bottom surface of tedge and down-comer and bottom surface
Together, the internal diameter D3 of ladle 501 is 3012mm, and dip pipe rises bore as 750mm, the gas supply flow (G) of RH vacuum refining furnaces
For 2.0m3·min-1, when the pressure of vacuum chamber 400 is 500Pa, circular flow (Q) is 160tmin-1, decarburization time is：
27.8min。
Comparative example 3
The substance of comparative example 3 leads to embodiment 1, the difference is that：Underlying nozzle 111 and upper strata nozzle 112 count
Measure identical, underlying nozzle 111 and upper strata nozzle 112 are 4.The internal diameter D3 of ladle 501 is 3012mm, in dip pipe tedge
Diameter is 750mm, and the gas supply flow (G) of RH vacuum refining furnaces is 2.0m3·min-1, the first feeder 610 and the second gas supply fill
The sum of 620 gas supply flow (G) is put as 2.0m3·min-1, wherein the gas supply flow of the first feeder 610 is 1m3·min-1,
The gas supply flow of second feeder 620 is 1m3·min-1, when the pressure of vacuum chamber 400 is 500Pa, circular flow (Q) is
175t·min-1, decarburization time is：25.6min.
It is compared by embodiment 1 with comparative example 1, comparative example 2 and comparative example 3 it can be found that can obtain drawing a conclusion：
(1) compared to comparative example 1 as can be seen that the circular flow of embodiment 1 and comparative example 2 all significantly increases, particularly pair
The circular flow of ratio 2 is by 130tmin-1Increase to 160tmin-1, decarburization time is reduced to by traditional 30min
27.8min.Its reason is：Using columnar dip pipe, the diameter of tedge is increased, so as to significantly improve cycle
Flow；
(2) comparative example 3 and comparative example 2 carry out comparison discovery, comparative example 3 using truncated cone-shaped dip pipe, circular flow by
160t·min-1Increase to 175tmin-1, decarburization time is reduced to 25.6min by 27.8min.Its reason is：Tedge
The gradually increase from the bottom to top axially along of the area of horizontal cross-section, increases the circulation area of dip pipe molten steel, thus can increase
The circular flow of vacuum circulating degasser RH.
(3) embodiment 1 and comparative example 3 carry out comparison discovery, embodiment 1 using truncated cone-shaped dip pipe, in central tube 100
4 underlying nozzles, 111,8 upper strata nozzles 112 are uniformly distributed on wall circumference, circular flow is by 175tmin-1It increases to
190t·min-1；Decarburization time is reduced to 22.0min by 25.6min.Embodiment 1 carries out comparison discovery, recycle stream with comparative example 1
Amount is by 130tmin-1Increase to 190tmin-1；Decarburization time is reduced to 22.0min by 30.0min.Its reason is：1)
Central tube 100 sets 4 underlying nozzles, 111,8 upper strata nozzles 112, and the spray air flow of underlying nozzle 111 is sprayed more than upper strata
Mouth 112 so that nozzle 112 quantity in upper strata is more, improves the circular flow of molten steel；2) area of tedge horizontal cross-section along
Its axial gradually increase from the bottom to top, dip pipe of the invention is set as truncated cone-shaped sleeve-shaped, so as to take full advantage of vacuum
400 base area of room increases dip pipe molten steel circulation area, is combined with the smaller argon gas bubbles of the penetrating of upper strata nozzle 112, from
And the gas saturation capacity in molten steel is further increased, while motive force of the bubble to molten steel is increased, improve gas and exist
Distribution in flow field of molten steel.
Applicant is creative to be proposed through the different tedge of upper and lower area of section, to improve molten steel in tedge
Flow Field Distribution improves the circular flow and refining effect of molten steel.Break in the prior art, conventional technique personnel are only led to
Improvement dipping pipe diameter is crossed to improve the technology prejudice of circular flow, there is unobviousness.
Embodiment 2
The substance of the present embodiment with embodiment 1, the difference is that：The liquid steel refining method of the present embodiment, step
In rapid two：Continue to vacuumize, when the pressure of the vacuum chamber 400 of RH vacuum refining furnaces is 6000Pa, adjust the first feeder
610 argon gas gas supply flow is：0.8m3/min；The argon gas gas supply flow of second feeder 620 is：0.5m3/min；When RH is true
When the pressure of the vacuum chamber 400 of empty refining furnace is 1500Pa, the argon gas gas supply flow for adjusting the first feeder 610 is：
1.8m3/min；The argon gas gas supply flow of second feeder 620 is：1.0m3/min；The area of tedge upper bottom surface is more than bottom
The area in face, and the gradually increase from the bottom to top axially along of the area of tedge horizontal cross-section, molten steel is under the driving of argon gas
Vacuum chamber 400 is flowed by continuous in tedge, under gravity the molten steel of vacuum chamber 400 by down-comer constantly
It is back in ladle 501, molten steel is made to generate cycle, circular flow (Q) is 205tmin-1。
Comparative example 4
The tedge and down-comer of the RH vacuum refining furnaces of this comparative example are to be provided separately, as general RH vacuum refinings
Stove, the internal diameter D3 of ladle 501 is 3012mm, and dip pipe rises bore as 550mm, the gas supply flow of existing RH vacuum refining furnaces
(G) it is 2.8m3·min-1, when the pressure of vacuum chamber 400 is 500Pa, circular flow (Q) is 125tmin-1。
Comparison is carried out by embodiment 1, embodiment 2, comparative example 1 and comparative example 4 to can be found that：
(1) embodiment 1 is compared with embodiment 2 it can be found that when the argon flow amount of the present invention is by 2.0m3·min-1Increase
Greatly to 2.8m3·min-1, with the further increase for flow of calming the anger in tedge, circular flow is by 190tmin-1Further increase
It is added to 205tmin-1；
(2) embodiment 2 is compared with comparative example 4 it can be found that in the case of identical argon flow amount, and using the present invention one
Kind RH vacuum refining furnaces, circular flow are much larger than traditional RH vacuum refining furnaces, so as to significantly improve RH vacuum refining furnaces
Metallurgical effect；
(3) comparative example 1 is carried out with comparative example 4, when argon flow amount is by 2.0m3·min-1Increase to 2.8m3·min-1, cycle
Flow is instead by 130tmin-1It is reduced to 125tmin-1。
The above problem annoyings applicant, and by a series of research, applicant is had found by prolonged research and probe,
When air-blowing quantity is larger in the tedge of existing RH vacuum refining furnace dip pipes, bubble is distributed dense, bubble volume in tedge
Larger proportion is accounted for, and when air-blowing quantity increases to a certain extent, circular flow can reach saturation, at this time if continuing to increase
Gas flow, the ratio that gas volume accounts for is very big, since liquid/gas is than too low, easily cause bubble formation air-flow directly by nozzle into
Enter vacuum chamber 400, and form gas " short circuit ", bubble is caused drastically to decline the drawing ratio of molten steel, causes molten steel instead
Circular flow becomes smaller.And it is found by the applicant that the area of section of tedge gradually increases from the bottom to top, so as to be spread in for bubble
Provide advantage in molten steel, the gas in molten steel is gradually reduced in uphill process by the pressure of molten steel, so as to increase
The saturation air-blowing quantity of molten steel, and since central tube 100 sets 4 underlying nozzles 111,8 upper strata nozzles 112, and lower floor
The spray air flow of nozzle 111 is more than upper strata nozzle 112 so that and nozzle 112 quantity in upper strata is more, and the argon gas bubbles of penetrating are smaller,
Smaller bubble is adequately spread in molten steel, increases the saturation point of gas flow in molten steel, and the increase of saturation point avoids gas
The phenomenon that bubble directly flows to vacuum chamber 400 by bottom and generates bubble " short circuit " improves gas in tedge and molten steel is drawn
Efficiency.Applicant has broken in the prior art, and conventional technique personnel improve circular flow only by increase gas supply flow
Technology prejudice, there is prominent substantive distinguishing features and significant progress.
Embodiment 3
The substance of the present embodiment with embodiment 1, the difference is that：The liquid steel refining method of the present embodiment, step
In rapid two：Continue to vacuumize, when the pressure of the vacuum chamber 400 of RH vacuum refining furnaces is 6000Pa, adjust the first feeder
610 argon gas gas supply flow is：0.8m3/min；The argon gas gas supply flow of second feeder 620 is：0.5m3/min；When RH is true
When the pressure of the vacuum chamber 400 of empty refining furnace is 1500Pa, the argon gas gas supply flow for adjusting the first feeder 610 is：
2.0m3/min；The argon gas gas supply flow of second feeder 620 is：1.2m3/min；The area of tedge upper bottom surface is more than bottom
The area in face, and the gradually increase from the bottom to top axially along of the area of tedge horizontal cross-section, molten steel is under the driving of argon gas
Vacuum chamber 400 is flowed by continuous in tedge, under gravity the molten steel of vacuum chamber 400 by down-comer constantly
It is back in ladle 501, molten steel is made to generate cycle, circular flow (Q) is 195tmin-1。
100 inner wall of central tube is evenly over the circumference distributed with 2 underlying nozzles 111, on 100 inner wall circumference of central tube uniformly
6 upper strata nozzles 112 are distributed with.Fixed beam 300 is set as 6, and the angle between fixed beam 300 is 60 °.Central tube 100
Cone angle be 5 °.Distance of the underlying nozzle 111 away from 100 upper bottom surface of central tube is 5 times away from bottom surface distance.The three-port type
Nozzle includes the upper stomata 152 of 2 air holes 151 and 1, and a diameter of 3mm of air holes 151, upper stomata 152 it is a diameter of
4mm。
Embodiment 4
The substance of the present embodiment with embodiment 1, the difference is that：The liquid steel refining method of the present embodiment, step
In rapid two：Continue to vacuumize, when the pressure of the vacuum chamber 400 of RH vacuum refining furnaces is 6000Pa, adjust the first feeder
610 argon gas gas supply flow is：0.8m3/min；The argon gas gas supply flow of second feeder 620 is：0.5m3/min；When RH is true
When the pressure of the vacuum chamber 400 of empty refining furnace is 1500Pa, the argon gas gas supply flow for adjusting the first feeder 610 is：
1.0m3/min；The argon gas gas supply flow of second feeder 620 is：0.8m3/min；The area of tedge upper bottom surface is more than bottom
The area in face, and the gradually increase from the bottom to top axially along of the area of tedge horizontal cross-section, molten steel is under the driving of argon gas
Vacuum chamber 400 is flowed by continuous in tedge, under gravity the molten steel of vacuum chamber 400 by down-comer constantly
It is back in ladle 501, molten steel is made to generate cycle, circular flow (Q) is 185tmin-1。
It is uniformly distributed with 6 underlying nozzles 111 on 100 inner wall circumference of central tube, on 100 inner wall circumference of central tube uniformly
10 upper strata nozzles 112 are distributed with.Fixed beam 300 is set as 8, and the angle between fixed beam 300 is 45 °.Central tube 100
Cone angle be 30 °.Distance of the underlying nozzle 111 away from 100 upper bottom surface of central tube is 8 times away from bottom surface distance.Three-port type nozzle
Including 2 air holes 151 and 1 above stomata 152, and a diameter of 5mm of air holes 151, a diameter of 6mm of upper stomata 152.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in attached drawing
What is shown is also one of embodiments of the present invention, and practical structure is not limited thereto.So if common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (8)
1. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe, it is characterised in that：Including tedge and down-comer, wherein on
The area of riser upper bottom surface is more than the area of bottom surface, and the area of tedge horizontal cross-section is gradual from the bottom to top axially along
Increase, the area of the tedge horizontal cross-section is the continuous function about tedge axial height；Dip pipe includes central tube
(100) and outer tube (200), the outer tube (200) is rounding mesa-shaped hollow pipe, the face of the upper bottom surface of outer tube (200)
Product is more than the area of bottom surface, and the top of the central tube (100) is fixedly connected with by fixed beam (300) and outer tube (200),
And central tube (100) and outer tube (200) are same axle center；Wherein：The central tube (100) is tedge, and central tube
(100) it is rounding mesa-shaped hollow pipe, the area of the upper bottom surface of central tube (100) is more than the area of bottom surface；Central tube (100) with
The ring sleeve that outer tube (200) is formed is down-comer；The cone angle of the central tube (100) is 5-30 °.
2. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 1, it is characterised in that：Described
Lower floor's air inlet (131) and upper strata are provided on the top of outer tube (200) and the outer wall of fixed beam (300) horizontal corresponding position
Air inlet (132), wherein lower floor's air inlet (131) is positioned at the lower section of upper strata air inlet (132)；Central tube (100) inner wall is set
There are a underlying nozzle (111) and upper strata nozzle (112), the underlying nozzle (111) and upper strata nozzle (112) are positioned at two not phases
On same horizontal plane, and the horizontal plane where underlying nozzle (111) is located at the lower section of upper strata nozzle (112) place horizontal plane, institute
The lower floor's air inlet (131) stated is connected by lower floor's gas-guide tube (121) with underlying nozzle (111), and upper strata air inlet (132) is logical
Upper strata gas-guide tube (122) is crossed with upper strata nozzle (112) to be connected.
3. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 1, it is characterised in that：Described
It is uniformly distributed with 2-6 underlying nozzle (111) on central tube (100) inner wall circumference, on central tube (100) inner wall circumference uniformly
6-10 upper strata nozzle (112) is distributed with.
4. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 3, it is characterised in that：Described
Lower annular gas-guide tube (141) and upper annular gas-guide tube (142), the lower annular gas-guide tube are provided in central tube (100)
(141) with underlying nozzle (111) in same level, lower floor's gas-guide tube (121) is by lower annular gas-guide tube (141) under
Layer nozzle (111) is connected, and the upper annular gas-guide tube (142) and upper strata nozzle (112) are in same level, upper strata
Gas-guide tube (122) is connected by upper annular gas-guide tube (142) with upper strata nozzle (112).
5. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 4, it is characterised in that：Described
The distance of underlying nozzle (111) away from upper bottom surface is 5-8 times away from bottom surface distance.
6. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 2-5 any one, feature
It is：The underlying nozzle (111) and upper strata nozzle (112) are three-port type nozzle, and the angle b between Kong Yukong is
120°。
7. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 6, it is characterised in that：Described
Three-port type nozzle includes 2 air holes (151) and 1 upper stomata (152), and a diameter of 3-5mm of air holes (151), upper gas
A diameter of 4-6mm in hole (152).
8. a kind of RH vacuum refining furnaces truncated cone-shaped sleeve dip pipe according to claim 6, it is characterised in that：Described
Fixed beam (300) is set as 4-8.
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| JPH0610027A (en) * | 1992-06-24 | 1994-01-18 | Nkk Corp | Vacuum degassing refining method for molten metal |
| JP2001262219A (en) * | 2000-03-22 | 2001-09-26 | Kurosaki Harima Corp | Method for lining-working of lower vessel in vacuum degassing apparatus |
| JP5365241B2 (en) * | 2009-02-18 | 2013-12-11 | 新日鐵住金株式会社 | Molten steel refining equipment |
| CN201793627U (en) * | 2010-08-06 | 2011-04-13 | 武汉钢铁(集团)公司 | Air feeding device used on ascending tube of RH refining furnace |
| CN103866090B (en) * | 2014-03-12 | 2015-09-30 | 东北大学 | RH equipment for vacuum refining telescopic soaking tub used |
| CN205874480U (en) * | 2016-08-12 | 2017-01-11 | 安徽工业大学 | RH vacuum refining is round platform shape sleeve dip pipe for stove |
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