CN107653355B - Rotatable arc furnace bottom and arc furnace - Google Patents
Rotatable arc furnace bottom and arc furnace Download PDFInfo
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- CN107653355B CN107653355B CN201711057402.5A CN201711057402A CN107653355B CN 107653355 B CN107653355 B CN 107653355B CN 201711057402 A CN201711057402 A CN 201711057402A CN 107653355 B CN107653355 B CN 107653355B
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- 238000003756 stirring Methods 0.000 claims abstract description 59
- 238000010891 electric arc Methods 0.000 claims abstract description 56
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 63
- 229910000831 Steel Inorganic materials 0.000 abstract description 29
- 239000010959 steel Substances 0.000 abstract description 29
- 230000000694 effects Effects 0.000 abstract description 16
- 238000003723 Smelting Methods 0.000 abstract description 8
- 239000011261 inert gas Substances 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 description 21
- 238000004088 simulation Methods 0.000 description 8
- 239000000700 radioactive tracer Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a rotatable electric arc furnace bottom and an electric arc furnace, wherein the rotatable electric arc furnace bottom comprises a fixed furnace bottom (4), a rotary furnace bottom (2) and a bottom gas injection mechanism, the rotary furnace bottom (2) is of a circular structure, an annular gap gas chamber (3) is formed between the rotary furnace bottom (2) and the fixed furnace bottom (4), the rotary furnace bottom (2) can rotate by taking the central line of the rotary furnace bottom (2) as an axis, a furnace bottom stirring paddle (1) is arranged on the inner surface of the rotary furnace bottom (2), and gas can enter a molten pool in the rotary furnace bottom (2) through the bottom gas injection mechanism and the gap gas chamber (3) in sequence. The molten steel in the molten pool is driven to rotate and stir by the rotating furnace bottom through the furnace bottom stirring paddle, meanwhile, the inert gas is continuously blown into the gap air chamber to stir the molten pool, the stirring effect of the molten pool is greatly improved by the superposition of double stirring effects, and the smelting dynamic conditions are improved.
Description
Technical Field
The invention relates to the field of steelmaking equipment, in particular to a rotatable electric arc furnace bottom, and also relates to an electric arc furnace comprising the rotatable electric arc furnace bottom.
Background
Stirring of the molten bath in an electric arc furnace has been one of the difficulties in electric arc furnace steelmaking. The arc furnace bath is generally of small depth due to the structural and shape constraints of the furnace itself, which presents major difficulties in bath stirring.
At present, the electric arc furnace molten pool stirring technology is mainly bottom blowing stirring technology. The bottom-blowing stirring technology generally blows inert gas at a certain position of the bottom of the electric furnace to drive molten steel to flow and stir a molten pool, however, because the depth of the molten pool of the electric furnace is small, the bottom-blowing gas escapes from the upper surface very quickly, and a bottom-blowing gas column can only drive the molten steel near a bottom-blowing point to flow, so the stirring effect of the bottom-blowing technology of the electric arc furnace is poor.
Disclosure of Invention
In order to enable the molten pool of the electric arc furnace to be easily stirred, the invention provides a rotatable electric arc furnace bottom and the electric arc furnace, wherein the bottom surface of the rotatable electric arc furnace bottom is provided with a furnace bottom stirring paddle, the molten pool is horizontally and axially stirred through the rotatable furnace bottom, and in addition, bottom blowing gas of a gap gas chamber is used for vertically stirring the molten pool, so that the stirring effect of the molten pool of the electric arc furnace is greatly improved. The rotatable electric arc furnace bottom and the electric arc furnace are reasonable in structure and excellent in performance, and good dynamic conditions are provided for electric arc furnace smelting.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a rotatable formula electric arc furnace stove bottom, is circular structure including fixed stove bottom, rotatory stove bottom and bottom gas injection mechanism, and rotatory stove bottom forms annular gap air chamber between rotatory stove bottom and the fixed stove bottom, and rotatory stove bottom can use the central line at rotatory stove bottom to rotate as the axle, and the internal surface at rotatory stove bottom is equipped with stove bottom stirring rake, and gas can loop through this bottom gas injection mechanism and the molten bath that the gap air chamber got into in the rotatory stove bottom.
The projection of the fixed furnace bottom on a plane vertical to the central line of the rotary furnace bottom is a circular ring, and the inner diameter of the circular ring is 1/4 to 3/4 of the outer diameter of the circular ring.
The thickness of the fixed furnace bottom is the same as that of the rotary furnace bottom, the width of the gap air chamber is 1-30 mm, and the central line of the fixed furnace bottom is superposed with that of the rotary furnace bottom.
The furnace bottom stirring paddle is a strip-shaped bulge which is arranged along the radial direction of the rotary furnace bottom, the height of the furnace bottom stirring paddle is 30 mm-300 mm, and the number of the furnace bottom stirring paddles is 2-8.
The rotatable electric arc furnace bottom further comprises a rotary driving mechanism, the rotary driving mechanism comprises a driving shaft, a transmission unit and a driving unit which are sequentially connected, the driving shaft is fixedly connected with the rotary furnace bottom, and the central line of the driving shaft is superposed with the central line of the rotary furnace bottom.
The central line of rotatory stove bottom sets up along vertical direction, and this bottom gas injection mechanism contains inner skleeve and outer sleeve, and the outer sleeve cover is located outside the inner skleeve, forms annular cavity between inner skleeve and the outer sleeve, and the upper end of outer sleeve and the lower surface sealing connection of fixed stove bottom, the upper end of inner skleeve and the lower surface sealing connection of rotatory stove bottom, the lower extreme sealing connection of inner skleeve and the lower extreme of outer sleeve, this annular cavity is corresponding with the position of gap air chamber, this annular cavity and gap air chamber intercommunication.
The central line of inner skleeve and the central line of outer sleeve all coincide with the central line of rotatory stove bottom, and along vertical direction, the inner skleeve divide into two sections from top to bottom, the upper end and the rotatory stove bottom fixed connection of the upper segment of inner skleeve, the lower extreme of the upper segment of inner skleeve and the upper end of the hypomere of inner skleeve rotate sealing connection.
The outer sleeve is divided into an upper section and a lower section along the vertical direction, the upper end of the upper section of the outer sleeve is fixedly connected with the fixed furnace bottom, and the lower end of the upper section of the outer sleeve is hermetically connected with the upper end of the lower section of the outer sleeve.
And the lower section of the outer sleeve is provided with a plurality of sequentially arranged gas injection through holes along the circumferential direction of the outer sleeve, and an annular gas injection channel is sleeved outside the lower section of the outer sleeve and is communicated with the gas injection through holes.
An electric arc furnace comprising a rotatable furnace bottom as described above, and a furnace wall located above the fixed furnace bottom.
The invention has the beneficial effects that:
1. because the bottom surface of the rotary furnace is provided with the furnace bottom stirring paddle, the furnace bottom can drive the molten steel to rotate when rotating, and the molten pool is stirred. Bottom blowing gas is introduced into the gap gas chamber, so that the molten pool can be stirred in the vertical direction, and impurities are promoted to float upwards.
2. The gap gas chamber not only can play a role of blowing gas to the bottom of a molten pool of the electric arc furnace, but also has the function of preventing steel leakage at the bottom of the furnace. Because the invention adopts the rotary furnace bottom, a gap is required to be reserved between the rotary furnace bottom and the fixed furnace bottom to ensure smooth rotary stirring, and if a gap air chamber is not designed, steel leakage is easily generated in the gap between the rotary furnace bottom and the fixed furnace bottom, so that the gap air chamber not only plays a role of bottom blowing air, but also can ensure that molten steel does not flow into the gap through blowing air, and the steel leakage accident is prevented.
3. The rotatable electric arc furnace bottom can stir a molten pool in the horizontal direction and the vertical direction during smelting. In the horizontal direction, the furnace bottom stirring paddle at the bottom of the molten pool rotates along the axial direction to drive the molten steel to rotate in the horizontal direction, and the molten steel in the middle of the electric furnace can be driven by the furnace bottom stirring paddle, so that the molten steel rotating in the middle can form a speed difference with the molten steel outside, and the heat exchange and the material exchange of the molten steel can be improved, and the stirring effect of the molten pool is improved. In the vertical direction, gas injected by a gap air chamber at the bottom of the molten pool is injected from the bottom of the molten pool and enters the molten pool, and the gas flows upwards and drives the molten steel to flow in the vertical direction, so that the stirring effect of the molten steel is improved. Therefore, the rotatable electric arc furnace bottom can stir the electric arc furnace molten pool better in both horizontal and vertical directions, and the dynamic conditions reflected by metallurgy in the electric arc furnace are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of the cross-sectional structure of a rotatable electric arc furnace hearth according to the present invention.
FIG. 2 is a schematic view of the structure of the rotatable furnace bottom of the electric arc furnace with the bottom gas injection mechanism removed.
FIG. 3 is a schematic view of the structure of a first bottom gas injection mechanism.
Fig. 4 isbase:Sub>A sectional view taken alongbase:Sub>A-base:Sub>A in fig. 3.
FIG. 5 is a schematic view of the structure of a second bottom gas injection mechanism.
FIG. 6 is a schematic view of the general structure of an electric arc furnace according to the invention.
1. A furnace bottom stirring paddle; 2. rotating the furnace bottom; 3. a slit air chamber; 4. fixing the furnace bottom; 5. a drive unit; 6. a drive shaft; 7. an inner sleeve; 8. an outer sleeve; 9. a gas injection through hole; 10. a gas injection channel; 11. a furnace wall; 12. a gas injection joint; 13. and a lower blocking plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The utility model provides a rotatable formula electric arc furnace stove bottom, including fixed stove bottom 4, rotatory stove bottom 2 and bottom gas injection mechanism, rotatory stove bottom 2 is circular structure, fixed stove bottom 4 contains the circular hole that is used for installing rotatory stove bottom 2, rotatory stove bottom 2 is arranged in this circular hole of fixed stove bottom 4, form annular gap air chamber 3 between rotatory stove bottom 2 and the fixed stove bottom 4, rotatory stove bottom 2 can use the central line of rotatory stove bottom 2 to rotate as the axle, the internal surface of rotatory stove bottom 2 is equipped with stove bottom stirring rake 1, gas can loop through this bottom gas injection mechanism and gap air chamber 3 and get into the molten bath in the rotatory stove bottom 2, as shown in fig. 1 to 5.
The external diameter size of the rotary furnace bottom 2 is slightly smaller than the internal diameter of the circular hole of the fixed furnace bottom 4, so that a circular gap air chamber 3 is formed between the fixed furnace bottom 4 and the rotary furnace bottom 2, and the bottom gas injection mechanism is positioned below the fixed furnace bottom 4 and the rotary furnace bottom 2. The rotary furnace bottom 2 rotates in a certain direction (taking a central line shown in figure 1 as an axis) in the electric arc furnace smelting process, and molten steel is driven to rotate in the direction through the furnace bottom stirring paddle 1 so as to stir a molten pool. The gap chamber 3 not only has the function of blowing gas to the bottom of the molten pool of the electric arc furnace, but also has the function of preventing steel leakage at the bottom of the furnace. Because the invention adopts the rotary furnace bottom, a gap is required to be reserved between the rotary furnace bottom 2 and the fixed furnace bottom 4 to ensure smooth rotary stirring, if gas is not blown into the furnace bottom through the gap gas chamber 3, steel leakage is easy to occur in the gap between the rotary furnace bottom 2 and the fixed furnace bottom 4, therefore, the gap gas chamber 3 not only plays the role of blowing gas from the bottom, but also can ensure that molten steel does not flow into the gap through blowing gas, and the steel leakage accident is prevented.
The rotatable electric arc furnace bottom can stir a molten pool in the horizontal direction and the vertical direction during smelting. In the horizontal direction, the furnace bottom stirring paddle 1 at the bottom of the molten pool rotates along the circumferential direction to drive the molten steel to rotate in the horizontal direction, and because the furnace bottom stirring paddle 1 can drive the molten steel in the middle of the electric furnace, the molten steel rotating in the middle can form a speed difference with the molten steel outside, so that the heat exchange and the material exchange of the molten steel can be improved, and the stirring effect of the molten pool is improved. In the vertical direction, the gas injected by the gap air chamber 3 at the bottom of the molten pool is injected from the bottom of the molten pool and enters the molten pool, and the gas drives the molten steel to flow in the vertical direction while flowing upwards, so that the stirring effect of the molten steel is improved. Therefore, the rotatable electric arc furnace bottom can stir the electric arc furnace molten pool better in both horizontal and vertical directions, and the dynamic conditions reflected by metallurgy in the electric arc furnace are improved.
In the embodiment, the projection of the fixed furnace bottom 4 on the plane vertical to the central line of the rotary furnace bottom 2 is a circular ring, and the inner diameter of the circular ring is 1/4 to 3/4 of the outer diameter of the circular ring. The thickness of the fixed furnace bottom 4 is the same as that of the rotary furnace bottom 2, the width of the gap air chamber 3 is 1 mm-30 mm, preferably the width of the gap air chamber 3 is 1 mm-10 mm, and the central line of the fixed furnace bottom 4 coincides with that of the rotary furnace bottom 2. The furnace bottom stirring paddle 1 is a strip-shaped bulge arranged along the radial direction of the rotary furnace bottom 2, the height of the furnace bottom stirring paddle 1 is 30 mm-300 mm, and the number of the furnace bottom stirring paddles 1 is 2-8. Wherein the thickness is the dimension in the direction B in fig. 1, the width is the dimension in the direction C in fig. 1, and the height is the dimension in the direction B in fig. 1.
In this embodiment, the rotatable electric arc furnace bottom further comprises a rotary drive mechanism comprising a drive shaft 6, a transmission unit and a drive unit 5 connected in sequence, the rotary drive mechanism being located below the rotary furnace bottom 2, the drive shaft 6 being rigidly and fixedly connected to the rotary furnace bottom 2, the centre line of the drive shaft 6 coinciding with the centre line of the rotary furnace bottom 2. The drive unit 5 is able to rotate the rotary hearth 2 via the transmission unit and the drive shaft 6 in turn. The drive means of the drive unit 5 may be electrically driven or hydraulically driven.
In this embodiment, the gas blown into the bottom of the molten bath in the rotary hearth 2 through the slit gas chamber 3 may be N 2 、Ar、CO 2 、O 2 Or a combination thereof. The rotatable electric arc furnace bottom can be used for an electric arc furnace of 3 t-300 t. The material of the furnace bottom stirring paddle 1 can be refractory material. The rotating speed of the rotary furnace bottom 2 is 0.5 to 3 revolutions per minute.
In this embodiment, the rotary furnace bottom 2 is located at the bottom of the fixed furnace bottom 4, the central line of the rotary furnace bottom 2 is arranged along the vertical direction, the bottom gas injection mechanism comprises an inner sleeve 7 and an outer sleeve 8, the outer sleeve 8 is sleeved outside the inner sleeve 7, an annular cavity is formed between the inner sleeve 7 and the outer sleeve 8, the upper end of the outer sleeve 8 is hermetically connected with the lower surface of the fixed furnace bottom 4, the upper end of the inner sleeve 7 is hermetically connected with the lower surface of the rotary furnace bottom 2, the lower end of the inner sleeve 7 is hermetically connected with the lower end of the outer sleeve 8, the annular cavity corresponds to the position of the gap gas chamber 3 and is communicated with the gap gas chamber 3, and bottom-blown gas can sequentially enter a molten pool in the rotary furnace bottom 2 through the annular cavity and the gap gas chamber 3, as shown in fig. 1 to 4.
In the present embodiment, the central line of the inner sleeve 7 and the central line of the outer sleeve 8 both coincide with the central line of the rotary hearth 2, and the inner sleeve 7 is divided into an upper section and a lower section along the vertical direction, the upper end of the upper section of the inner sleeve 7 is fixedly and hermetically connected with the lower surface of the rotary hearth 2, the lower end of the upper section of the inner sleeve 7 is rotatably and hermetically connected with the upper end of the lower section of the inner sleeve 7, and the lower end of the lower section of the inner sleeve 7 is fixedly and hermetically connected with the lower end of the outer sleeve 8, as shown in fig. 1 and 3. When in use, the lower section of the inner sleeve 7, the outer sleeve 8 and the fixed furnace bottom 4 are all in a static state, and the upper section of the inner sleeve 7 and the rotary furnace bottom 2 all rotate synchronously by taking the driving shaft 6 as an axis.
In the present embodiment, the outer sleeve 8 is divided into two sections, the upper end of the upper section of the outer sleeve 8 is fixedly and hermetically connected with the fixed furnace bottom 4, the lower end of the upper section of the outer sleeve 8 is hermetically connected with the upper end of the lower section of the outer sleeve 8, the lower end of the lower section of the outer sleeve 8 is fixedly and hermetically connected with the lower end of the lower section of the inner sleeve 7, and the lower end surface of the upper section of the outer sleeve 8 are located in the same horizontal plane. The advantages of providing the inner sleeve 7 and the outer sleeve 8 as upper and lower sections are that the processing is convenient, and the sealing performance of the annular cavity formed between the inner sleeve 7 and the outer sleeve 8 is ensured.
In the present embodiment, a plurality of gas injection through holes 9 are sequentially arranged on the lower section of the outer sleeve 8 along the circumferential direction of the outer sleeve 8, an annular gas injection channel 10 is sleeved on the lower section of the outer sleeve 8, the gas injection channel 10 is communicated with the gas injection through holes 9, and the gas injection channel 10 is connected with a gas injection joint 12. The bottom-blowing gas may enter the gas-injection passage 10, the annular cavity, and the slit chamber 3 in this order from the gas-injection joint 12, as shown in fig. 3 and 4. Or, along the circumference of the inner sleeve 7, the lower section of the inner sleeve 7 is provided with a plurality of gas injection through holes 9 which are arranged in sequence, the lower end of the inner sleeve 7 is fixedly and hermetically connected with a lower blocking plate 13, the lower blocking plate 13 is sleeved outside the driving shaft 6, the lower blocking plate 13 is rotationally and hermetically connected with the driving shaft 6, and the lower blocking plate 13 is connected with a gas injection joint 12. From the gas injection fitting 12, the bottom-blowing gas can enter the inner sleeve 7, the annular cavity and the slit chamber 3 in sequence, as shown in fig. 5.
An electric arc furnace comprising a rotatable furnace bottom as described above and a furnace wall 11, the furnace wall 11 being located above the fixed furnace bottom 4, is described below, as shown in fig. 6.
In the smelting process of the electric arc furnace, the rotary driving mechanism drives the rotary furnace bottom 2 to drive molten steel to rotate, and simultaneously, inert gas is continuously blown to the bottom of the gap gas chamber 3 to stir the molten pool, so that the double stirring effects are superposed, the stirring effect of the molten pool is greatly improved, and the smelting dynamic conditions are improved.
The inventor of the invention adopts ANSYS CFX software to carry out a series of numerical simulation experiments, and the experiments show that the stirring and uniformly mixing effect of the rotatable electric arc furnace bottom of the invention is far superior to that of the bottom blowing stirring technology of the traditional electric arc furnace.
In the numerical simulation experiment, steady-state simulation is firstly carried out, then the flow field result of the steady-state simulation is used as the initial condition of the unsteady-state simulation to carry out the unsteady-state simulation of the blending time, and the blending time of the scheme is calculated. During the unsteady state simulation, additional variables of the tracer are established and a transport equation is set for the variables to calculate the concentration profile of the tracer. Adding the tracer with the concentration of 1 from a bottom blowing inlet within 0 s-0.1 s at the beginning of calculation, then stopping adding, and setting two monitoring points in the fluid area to monitor and record the concentration change condition of the tracer. Setting monitoring points in the model, reading the concentration of the tracer at the monitoring points, and indicating that the molten pool is uniformly mixed when the concentration difference of the tracer at the two monitoring points is less than 5%. The blending time of each embodiment is simulated and calculated in the way, and the blending effect is superior or inferior compared with that of different schemes.
Example 1 and comparative example 1 numerical simulations were performed on a rotatable arc furnace hearth and a conventional bottom-blown arc furnace hearth, respectively, to discuss the bath homogenization effects of the two stirring modes.
Example 1
The main parameters in the embodiment are the diameter of the rotary furnace bottom 1/2R, the height of the stirring paddles at the furnace bottom 1 is 200mm, the number of the stirring paddles at the furnace bottom 1 is 4, the rotating speed of the rotary furnace bottom 2 is 2R/min, the pressure of bottom blowing gas is 1.6Mpa, and the width of the gap gas chamber 3 is 5mm.
The bath puddle time in this example was 5.2s.
Comparative example 1
The rotating speed of the rotary furnace bottom 2 in the comparative example is 0R/min, and other parameters are the same as those in the example 1, including the diameter of the rotary furnace bottom 1/2R, the height of the furnace bottom stirring paddle 1 is 200mm, the number of the furnace bottom stirring paddles 1 is 4, the pressure of bottom blowing gas is 1.6Mpa, and the width of the slit gas chamber 3 is 5mm.
The homogenisation time in this comparative example was 86.5s.
Comparing example 1 with comparative example 1, the stirring effect of the rotatable bottom of the electric arc furnace according to the invention is much better than that of a conventional bottom-blowing electric arc furnace. The invention is suitable for an electric arc furnace of 3 t-300 t. According to the rotatable electric arc furnace bottom, molten steel in a molten pool is driven to be stirred in a rotating mode through the furnace bottom stirring paddle, meanwhile, inert gas is continuously blown into the gap air chamber to stir the molten pool, the stirring effect of the molten pool is greatly improved due to the superposition of double stirring effects, and the smelting dynamic conditions are improved.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (10)
1. The utility model provides a rotatable formula electric arc furnace stove bottom, a serial communication port, rotatable formula electric arc furnace stove bottom is including fixed stove bottom (4), rotatory stove bottom (2) and bottom gas injection mechanism, rotatory stove bottom (2) are circular structure, form annular gap air chamber (3) between rotatory stove bottom (2) and the fixed stove bottom (4), rotatory stove bottom (2) can use the central line of rotatory stove bottom (2) to rotate as the axle, the internal surface of rotatory stove bottom (2) is equipped with stove bottom stirring rake (1), gas can loop through this bottom gas injection mechanism and gap air chamber (3) and get into the molten bath in the rotatory stove bottom (2).
2. The rotatable arc furnace hearth according to claim 1, characterised in that the projection of the fixed hearth (4) onto a plane perpendicular to the centre line of the rotatable hearth (2) is in the shape of a circular ring with an inner diameter of 1/4 to 3/4 of the outer diameter of the circular ring.
3. The rotatable arc furnace bottom according to claim 2, characterised in that the thickness of the fixed bottom (4) is the same as the thickness of the rotatable bottom (2), that the width of the gap gas chamber (3) is 1-30 mm, and that the centre line of the fixed bottom (4) coincides with the centre line of the rotatable bottom (2).
4. The rotatable electric-arc furnace bottom according to claim 1, characterized in that the bottom paddles (1) are strip-shaped protrusions arranged along the radial direction of the rotatable bottom (2), the height of the bottom paddles (1) is 30mm to 300mm, and the number of the bottom paddles (1) is 2 to 8.
5. Rotatable electric arc furnace bottom according to claim 1, characterized in that the rotatable electric arc furnace bottom further comprises a rotary drive mechanism comprising a drive shaft (6), a transmission unit and a drive unit (5) connected in sequence, the drive shaft (6) being fixedly connected to the rotary furnace bottom (2), the centre line of the drive shaft (6) coinciding with the centre line of the rotary furnace bottom (2).
6. The rotatable electric arc furnace bottom according to claim 1, characterized in that the center line of the rotary furnace bottom (2) is arranged along the vertical direction, the bottom gas injection mechanism comprises an inner sleeve (7) and an outer sleeve (8), the outer sleeve (8) is sleeved outside the inner sleeve (7), an annular cavity is formed between the inner sleeve (7) and the outer sleeve (8), the upper end of the outer sleeve (8) is hermetically connected with the lower surface of the fixed furnace bottom (4), the upper end of the inner sleeve (7) is hermetically connected with the lower surface of the rotary furnace bottom (2), the lower end of the inner sleeve (7) is hermetically connected with the lower end of the outer sleeve (8), the annular cavity corresponds to the position of the gap gas chamber (3), and the annular cavity is communicated with the gap gas chamber (3).
7. The rotatable electric arc furnace bottom according to claim 6, characterized in that the center line of the inner sleeve (7) and the center line of the outer sleeve (8) both coincide with the center line of the rotatable furnace bottom (2), the inner sleeve (7) is divided into an upper section and a lower section in the vertical direction, the upper end of the upper section of the inner sleeve (7) is fixedly connected with the rotatable furnace bottom (2), and the lower end of the upper section of the inner sleeve (7) is in rotary sealing connection with the upper end of the lower section of the inner sleeve (7).
8. Rotatable electric arc furnace bottom according to claim 7, characterized in that the outer sleeve (8) is divided in a vertical direction into an upper section and a lower section, the upper end of the upper section of the outer sleeve (8) being fixedly connected to the fixed furnace bottom (4), and the lower end of the upper section of the outer sleeve (8) being sealingly connected to the upper end of the lower section of the outer sleeve (8).
9. The rotatable electric arc furnace bottom according to claim 7, characterized in that the outer sleeve (8) has a plurality of gas injection through holes (9) arranged in series along the circumference of the outer sleeve (8), and the outer sleeve (8) has a gas injection channel (10) in the shape of a ring sleeved on the lower section, wherein the gas injection channel (10) is communicated with the gas injection through holes (9).
10. Electric arc furnace, characterized in that it comprises a rotatable furnace bottom according to any one of claims 1-9, and a furnace wall (11), the furnace wall (11) being located above the fixed furnace bottom (4).
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| CN201711057402.5A CN107653355B (en) | 2017-11-01 | 2017-11-01 | Rotatable arc furnace bottom and arc furnace |
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| CN201711057402.5A CN107653355B (en) | 2017-11-01 | 2017-11-01 | Rotatable arc furnace bottom and arc furnace |
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| RU2197540C2 (en) * | 2001-04-24 | 2003-01-27 | Хлопонин Виктор Николаевич | Method of mixing steel in ladle |
| CN101655314A (en) * | 2009-09-27 | 2010-02-24 | 顾玲 | Annular reduction furnace capable of not leaking material at furnace bottom |
| JP2012201935A (en) * | 2011-03-25 | 2012-10-22 | Jfe Steel Corp | Ladle refining apparatus and ladle refining method using the same |
| CN103468863B (en) * | 2013-09-29 | 2016-02-03 | 武汉嘉特重型设备有限公司 | The smelting technology of electric arc furnace top and bottom blowing system and this system of employing |
| JP6311324B2 (en) * | 2014-01-20 | 2018-04-18 | 新日鐵住金株式会社 | Method of bottom blowing stirring for arc furnace for steel making and arc furnace for bottom blowing stirring steel making |
| CN106914183A (en) * | 2017-04-05 | 2017-07-04 | 东北大学 | A kind of rotary EMS device for being arranged on metal bath furnace bottom |
| CN207498407U (en) * | 2017-11-01 | 2018-06-15 | 中冶京诚工程技术有限公司 | Rotatable arc furnace bottom and arc furnace |
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2017
- 2017-11-01 CN CN201711057402.5A patent/CN107653355B/en active Active
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