CN202968622U

CN202968622U - Single-mouth vacuum refining device

Info

Publication number: CN202968622U
Application number: CN 201220713193
Authority: CN
Inventors: 张立峰; 李菲; 王升千
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2012-12-20
Filing date: 2012-12-20
Publication date: 2013-06-05
Anticipated expiration: 2022-12-20

Abstract

The utility model relates to a single-mouth vacuum refining device, belonging to the technical field of ferrous metallurgy external refining. The single-mouth vacuum refining device mainly comprises a vacuum chamber, a retaining wall, a steel ladle and a blowing port, wherein the retaining wall is arranged at the lower part of the vacuum chamber to separate a single immersion pipe into a first immersion pipe and a second immersion pipe; the blowing port is positioned below the first immersion pipe, and the distance between the blowing port and the bottom of the device is 0.1-0.5 time of the height of the retaining wall; the cross sections of the two immersion pipes are semicircular, elliptic or in other shapes; the height H of the retaining wall is 0.3-0.7 time of the height H0 of the vacuum chamber; and the radius R of each immersion pipe is 0.5-1.0 time of the radius R0 of the vacuum chamber. By adopting the single-mouth vacuum refining device, nonuniform mixing caused by back-mixing in the ascending and descending processes of molten steel can be effectively avoided, the uniform mixing time is shortened, the flowing dead zones of the molten steel in the steel ladle are reduced to the utmost extent, and the retention time of the molten steel in the vacuum chamber is prolonged, so that the refining efficiency is improved.

Description

A kind of single mouth equipment for vacuum refining

Technical field

The utility model technology relates to the furnace outer refining technology field, has specifically provided a kind of novel single mouth equipment for vacuum refining.

Background technology

In recent years, along with the raising that market is required the steel products purity and the demand of product diversification, furnace outer refining technology has become a link indispensable in modern steel-smelting technology.Vacuum lifting degassing method DH and vacuum circulation degassing method RH are widely used two kinds of furnace outer refining technologies.

The DH method depends on pressure balanced principle, and vacuum chamber is evacuated after state, and molten steel rises along suction nozzle, and to enter into vacuum chamber degassed, the ladle or promote vacuum chamber of then descending, and the molten steel after degassed returns in ladle.The RH method develops into two dipping tubes by single dipping tube on the basis of DH method, namely a upcast and a downtake, rise and descend by realize the circulation of molten steel in upcast bottom air blowing, so greatly simplified hydraulicefficiency elevation structure complicated in the DH method.But its shortcoming is that the dipping tube diameter is little, and circular flow is low, and refining pressure is large, and easily bond in vacuum chamber residual steel and residue, and these have all restricted further developing of furnace outer refining technology.The single-mouth refining furnace that occurs afterwards is on the basis of DH, change at ladle bottom eccentric bottom-blowing gas, realize the circulation of molten steel in vacuum chamber and ladle, but the molten steel that causes due to ladle bottom blowing and the stirring of slag, cause the erosion of vacuum chamber refractory materials and etch phenomenon serious, be the problem that waits to solve work-ing life all the time.

The utility model is namely short for the single mouth vacuum refining furnace of tradition dipping tube service life of refractory material and the two dipping tube internal diameters of RH are little, the shortcoming that circular flow is low, get both chiefs, use the straight barrel type list dipping tube with barricade, Ladle Bottom is blown changes in dipping tube bottom air blowing simultaneously.So both avoid the serious dipping tube erosion phenomenon of single mouth vacuum refining furnace, enlarged again the dipping tube internal diameter, improved refining efficiency.

The utility model content

The purpose of this utility model has been to provide a kind of novel single mouth equipment for vacuum refining, compares with traditional single-mouth refining furnace, has following advantage: 1, increased the barricade device of dipping tube, extended the residence time of molten steel at vacuum chamber, improved degassing efficiency.2, effectively avoid molten steel to rise and the decline process in back-mixing and the mixing that causes of crossfire uneven, mixing time is long and reduce flow dead.3, puff port is changed into the first dipping tube bottom, side-blown is alleviated Bottom Blowing greatly to the erosion of the anti-material of dipping tube, extends the work-ing life of anti-material.

The utility model mainly is comprised of vacuum chamber 1, barricade 2, ladle 3 and puff port 4, and wherein the vacuum chamber bottom is provided with barricade, and wall height H is the vacuum chamber height H ₀0.3 ~ 0.7, the dipping tube radius R is the vacuum chamber radius R ₀0.5 ~ 0.9.Insert in ladle the vacuum chamber bottom, and puff port is positioned at the lower-left side of the first dipping tube 5, and puff port 4 is 0.1 ~ 0.5 of wall height apart from the distance of dipping tube bottom.Ladle 3 is positioned at the below of vacuum chamber 1.

In the utility model, barricade 2 is divided into the first dipping tube 5 and the second dipping tube 6 with the dipping tube of vacuum chamber 1 bottom, be equivalent to upcast and downtake in the RH vacuum degasser, realize molten steel circulation of 1 from ladle 3 to vacuum chamber by the puff port that is positioned at the first dipping tube 5.Increase the barricade 2 of vacuum chamber 1 bottom, extended the residence time of molten steel at vacuum chamber 1, strengthen degasifying effect, avoid back-mixing and the crossfire of molten steel in rising and decline process, reduce more the flow dead of single-mouth refining furnace.

Be positioned at the puff port 4 of the first dipping tube 5 sides in the utility model, owing to being side-blown, gas is the direct anti-material of erosion not, but rise along dipping tube under the effect in flow field, alleviate greatly the serious phenomenon of erosion of anti-material, extended the work-ing life of device, saved cost.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment one;

Fig. 2 is that Fig. 1 is at the sectional drawing at A-A' place;

Fig. 3 is that Fig. 1 is at the sectional drawing at B-B' place;

Fig. 4 is the structural representation of the utility model embodiment two;

Fig. 5 is that Fig. 4 is at the sectional drawing at A-A' place;

Fig. 6 is that Fig. 4 is at the sectional drawing at B-B' place;

Fig. 7 is the details drawing of Fig. 3.

In figure, 1 is vacuum chamber, and 2 is barricade, and 3 is ladle, and 4 is puff port, and 5 is the first dipping tube, and 6 is the second dipping tube.

Embodiment

Fig. 1,2,3,4,5,6 is two specific embodiments of the present utility model.

In these two embodiment, device of the present utility model mainly is comprised of vacuum chamber 1, barricade 2, ladle 3 and puff port 4, the bottom that barricade 2 is arranged on vacuum chamber is divided into the dipping tube 6 of the first dipping tube 5 and second with it, the cross section semicircular in shape of dipping tube (embodiment 1) or oval (embodiment 2).In refining process, two dipping tubes are immersed in certain depth in molten steel, and at the puff port input driving gas of the first dipping tube bottom.The isothermal expansion that causes due to expanded by heating and pressure drop due to the existence of vacuum chamber inside and outside differential pressure and driving gas makes the reasons such as density reduction of molten steel and gaseous mixture in the ascent stage, molten steel enters into vacuum chamber 1 by the first dipping tube, and molten steel is got back in ladle 3 by another dipping tube afterwards.Under the effect of the two dipping tubes of this single mouth, flowing of molten steel ladle will be compared with traditional RH device than traditional single mouth list dipping tube, the mixing that can effectively avoid the back-mixing in molten steel rising and decline process to cause is uneven, mixing time is long, alleviate the erosion of blowing to the anti-material of dipping tube, thereby extension fixture work-ing life, improve refining efficiency.

In embodiment one, as shown in Figure 1, 2, 3, the bottom that barricade 2 is arranged on vacuum chamber equates the cross-sectional area that it is divided into 6, two dipping tubes of dipping tube of the first dipping tube 5 and second, and it is shaped as semicircle.

In embodiment two, as shown in Fig. 4,5,6, barricade 2 is arranged on the bottom of vacuum chamber with its equating of cross-sectional area that is divided into 6, two dipping tubes of dipping tube of the first dipleg 5 and second, and it is shaped as ellipse.

Claims

1. single mouth equipment for vacuum refining, it is characterized in that: this device is comprised of vacuum chamber (1), barricade (2), ladle (3) and puff port (4), the bottom that barricade (2) is arranged on vacuum chamber (1) cuts off into single dipping tube on the first dipping tube (5) and the second dipping tube (6), puff port (4) is positioned at the bottom of the first dipping tube (5), and ladle (3) is positioned at the below of vacuum chamber (1).

2. equipment for vacuum refining as claimed in claim 1, it is characterized in that: described the first dipping tube (5) is upcast, and the second dipping tube (6) is downtake.

3. equipment for vacuum refining as claimed in claim 1, it is characterized in that: described barricade (2) height H is vacuum chamber (1) height H ₀0.3-0.7, the dipping tube radius R is vacuum chamber (1) radius R ₀0.5-0.9.

4. equipment for vacuum refining as claimed in claim 1 is characterized in that: puff port (4) is positioned at the first dipping tube (5) bottom, is the 0.1-0.5 of wall height apart from the height of dipping tube bottom.