CN102559993A - Device and method for stirring metallic molten pool by using pulsating gas - Google Patents
Device and method for stirring metallic molten pool by using pulsating gas Download PDFInfo
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- CN102559993A CN102559993A CN2012100154299A CN201210015429A CN102559993A CN 102559993 A CN102559993 A CN 102559993A CN 2012100154299 A CN2012100154299 A CN 2012100154299A CN 201210015429 A CN201210015429 A CN 201210015429A CN 102559993 A CN102559993 A CN 102559993A
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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
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
- C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
- F27D2027/002—Gas stirring
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- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a device for stirring a metallic molten pool by using pulsating gas. The device comprises at least one gas-permeable element arranged at the bottom of an electric furnace and a stirring gas supply device connected with the gas-permeable element, wherein the stirring gas supply device comprises a gas supply pipeline system and a main pipeline; the main pipeline and the gas-permeable element are arranged in a one-to-one correspondence mode; the main pipeline is respectively connected with the gas-permeable element and the gas supply pipeline system and is provided with a main control valve and a pulsation generator; and the pulsation generator comprises a rapid cut-off valve and a normally open channel which is connected in parallel with the rapid cut-off valve. The invention also discloses a method for stirring the metallic molten pool by using the pulsating gas. Continuous gas which passes through the normally open channel and the pulsating gas which passes through the rapid cut-off valve are converged to form stirring gas, and the stirring gas enters the metallic molten pool through the gas-permeable element, wherein the minimum flow of the continuous gas is more than or equal to the minimum ventilation of the unblocked gas-permeable element, and the flow of the pulsating gas is subjected to periodic fluctuation.
Description
Technical field
The invention belongs to metal pool Control Based Bottom-blown Stirring field, concrete a kind of metal pool pulsed gas whipping appts and the method for relating to.
Background technology
In the modern steel-smelting technology, 1/3 of global output of steel is produced via electric furnace.Electric furnace is a power consumption rich and influential family, how to let the productivity that realize to improve electric furnace, to fall that the end consumes be the target of asking most in the industry.When electric furnace is produced; Utilize the electric-arc heating melting waste steel and the molten steel that heats up; But electric arc is when heating steel scrap and molten steel; Main lean on that arc light and plasma body (about 4000～6000 ℃ of temperature) are local to be heated steel scrap and molten steel, local heating has reduced the heat transfer area of electric arc to steel scrap (or other metal, alloy) and metal bath on the one hand, thereby influences the thermo-efficiency of the electric-arc heating of whole electric furnace; The shallow surface of localized metallic bath is overheated on the other hand, can cause surface metal bath surface metal liquid to vaporize on a small quantity also and oxygen combustion, has fallen at the end recovery rate of iron.
One of ways of addressing this issue is on electric furnace, to install bottom blowing whipping appts and system additional in the industry, increases when getting into the solid-liquid admixture in the electrosmelting process, and heat transfer and logistics that the flowability of liquid metal improves total system change.This technology is the comparison success; Like " electric arc furnace bottom blowing stirring technique exploitation present situation " (" steel research " the 5th phase (total the 80th phase); 1994.9) and " direct current electric arc furnace BOTTOM GAS STIRRING AND SMELTING TECHNOLOGY OF DEEP " (" Shanghai metal " the 20th the 2nd phase of volume, 1998.3) present situation of existing electric arc furnace bottom blowing stirring technique and the technique effect of obtaining are all disclosed.
Though existing electric furnace air blowing stirring technique has overcome the problem that the metal pool undermixing is brought to a certain extent effectively; Improve productivity and reduced smelting energy consumption and cost; But existing electric furnace air blowing stirring technique does not solve the technical problem of the efficient that how to realize improving electric furnace shallow pool gas stirring.In addition; Stir the deep molten bath notion of bottom blowing though in " direct current electric arc furnace BOTTOM GAS STIRRING AND SMELTING TECHNOLOGY OF DEEP ", proposed electric furnace; But deep molten bath is owing to structural reason; When full dose is tapped, can cause the body of heater turning angle to increase, when tapping, will produce residual molten steel amount and increase and increase the tapping steel difficulty by eccentric bottom construction.
Given this; The present invention is intended to explore a kind of metal pool pulsed gas whipping appts and method; This metal pool pulsed gas whipping appts and method can effectively improve the production efficiency of electric furnace and optimize type of furnace design; Also have homogeneity, the power consumption that falls end electric furnace production that improves electric furnace production temperature, the beneficial effect that reduces the consumption of bottom blown gas, have tangible economic benefit.
Summary of the invention
The technical problem that the present invention will solve is to propose a kind of metal pool pulsed gas whipping appts and adopt this metal pool pulsed gas whipping appts to produce the method for electric steel; Metal pool pulsed gas whipping appts of the present invention and method can effectively improve the production efficiency of electric furnace and optimize type of furnace design; Also have homogeneity, the power consumption that falls end electric furnace production that improves electric furnace production temperature, the beneficial effect that reduces the consumption of bottom blown gas, have tangible economic benefit.
Realize above-mentioned technical purpose; The present invention has at first proposed a kind of metal pool pulsed gas whipping appts; Comprise at least one ventilated element and the microgas body feeding that links to each other with said ventilated element of being arranged on the electric furnace bottom; It is characterized in that: said microgas body feeding comprise gas supply pipe system and with the main line of the corresponding one by one setting of said ventilated element; Said main line links to each other with gas supply pipe system with ventilated element respectively, and said main line is provided with main control valve and flutter generator, and said flutter generator comprises the normal open walk of repid cut-off valve and parallelly connected setting with said repid cut-off valve.
Further, said normal open walk is provided with and often drives variable valve;
Further, said flutter generator is arranged on the main line near said ventilated element;
Further, also comprise the subsequent use stirring bypass of parallelly connected setting with said main control valve and flutter generator, said subsequent use stirring bypass is provided with normally closed variable valve;
Further, also comprise unit, said unit is electrically connected with said gas supply pipe system, flutter generator, normally closed variable valve and main control valve respectively;
Further, said ventilated element is arranged near the said tap holes of electric furnace and/or is arranged on said electric furnace electric-arc heating district's annex and/or is arranged near the said electric furnace charging discharging point.
The invention allows for a kind of employing metal pool pulsed gas stirring means of metal pool pulsed gas whipping appts as stated; Be the uninterrupted gas that flow is cyclic fluctuation through the stirring gas that gets into metal pool behind said flutter generator, main line and the ventilated element successively, and the minimum flow rate of said stirring gas is more than or equal to the nonclogging minimum air flow of said ventilated element.After getting into metal pool, the uninterrupted gas stirring gas of the uninterrupted gas of metal pool in metallic solution, forms bubble; Volumetric expansion when gaseous tension and metal liquid pressure release; In addition, metal liquid is to the gas heating volumetric expansion, and bubble floating also stirs metallic solution.
Further, flow is 0.1-0.9 greater than the time zone and the ratio in said cycle of said pulsed gas flow MV in each ebb-flow cycle of said stirring gas;
Further, the ratio of said stirring gas flow peak and minimum value is 2-200;
Further, when the quantity of said ventilated element during more than or equal to two, the pulsation phase of the stirring gas through each said ventilated element is through said flutter generator independent control, and by said unit realization matrix control.
Beneficial effect of the present invention is:
Metal pool pulsed gas whipping appts of the present invention through with main line that ventilated element links to each other on flutter generator is set; And flutter generator comprises the normal open walk of repid cut-off valve and parallelly connected setting with said repid cut-off valve; The stirring gas that is used to stir metal pool comprises that two portions form: sub-fraction is the uninterrupted gas via normal open walk; And the minimum flow rate of uninterrupted gas prevents that more than or equal to the minimum air flow of ventilated element ventilated element from stopping up because of dying, and another major part is the pulsed gas via repid cut-off valve; Utilize the rapidly opened and closed function of repid cut-off valve; Make pulsed gas by some cycles rule pulsation, uninterrupted gas and pulsed gas converge the back and form continuously uninterrupted and be the stirring gas of cycle pulsation, stir the metallic solution formation bubble of gas in ventilated element gets into electric furnace; Volumetric expansion when gaseous tension and metal liquid pressure release; Metal liquid is to the gas heating volumetric expansion, and bubble and come-up produce the mixing effect of pulsation in metal pool.
Employing is the stirring gas of cycle pulsation and selects suitable ebb-flow cycle and pulsation ratio for use, pulsed gas is selected for use suitable peak pulse duration stirring gas; Even as far as more shallow electric furnace; Under same stirring gas consumption prerequisite; Mixing effect can improve more than 30%～50% with the kinetic energy assessment that metallic solution obtains; And can obtain with prior art in continuously stirring is close in deep molten bath mixing effect, this brings great effect to the design of the electric furnace type of furnace, electric cooker structure design and the operation of electric steel production technique, has overcome and will improve the technical limitation that existing electric furnace bottom blowing mixing effect must increase the electric furnace degree of depth.Here, the electric furnace aspect ratio that refers to the metal bath in shallow pool as referred to herein is at 0.2 ~ 0.25 electric furnace; The aspect ratio that refers to the metal bath than the shallow pool electric furnace is at 0.25 ~ 0.3 electric furnace; Be meant that than the deep molten bath electric furnace metal bath aspect ratio is at 0.3 ~ 0.4 electric furnace.
Description of drawings
Fig. 1 is existing metal pool pulsed gas whipping appts structural representation;
Fig. 2 is a metal pool pulsed gas whipping appts example structure synoptic diagram of the present invention;
Fig. 3 is the microgas bulk wave shape synoptic diagram in the existing continuous gas stirring means;
Fig. 4 is for adopting the microgas bulk wave shape synoptic diagram of metal pool pulsed gas stirring means of the present invention;
Fig. 5 is the molten steel velocity profile of the continuous bottom blowing in the existing continuous gas stirring means;
Fig. 6 can regard the shallow pool pulsation mixing effect under the high pulsation ratio as for adopting the molten steel velocity profile of the pulse bottom blowing in the metal pool pulsed gas stirring means of the present invention;
Fig. 7 is for adopting the molten steel velocity profile of the pulsation bottom blowing in the metal pool pulsed gas stirring means of the present invention.
Embodiment
Elaborate below in conjunction with the accompanying drawing specific embodiments of the invention.
As shown in Figure 2, be metal pool pulsed gas whipping appts example structure synoptic diagram of the present invention.The metal pool pulsed gas whipping appts of present embodiment; Comprise at least one ventilated element 3 that is arranged on electric furnace 2 bottoms and the microgas body feeding that links to each other with said ventilated element 3; Said microgas body feeding comprise gas supply pipe system 9 and with the main line of the corresponding one by one setting of said ventilated element 3; Said main line links to each other with gas supply pipe system 9 with ventilated element 3 respectively; Said main line is provided with main control valve 8 and flutter generator 5, and said flutter generator comprises the normal open walk of repid cut-off valve 5a and parallelly connected setting with said repid cut-off valve 5a.As shown in Figure 2; The gas supply pipe system 9 of the metal pool pulsed gas whipping appts of present embodiment is identical with existing structure; Parameters such as the flow of 9 pairs of stirrings of gas supply pipe system gas 4, temperature and pressure are provided with, and conventional func such as stirring gas 4 high base pressures switchings and 4 cut-outs of stirring gas are provided.Main control valve 8 is used for the total flux that stirs gas 4 is controlled.
Metal pool pulsed gas whipping appts of the present invention through with main line that ventilated element 3 links to each other on flutter generator 5 is set; And flutter generator 5 comprises the normal open walk of repid cut-off valve 5a and parallelly connected setting with said repid cut-off valve 5a; The stirring gas 4 that is used to stir metal pool 1 comprises that two portions form: sub-fraction is the uninterrupted gas via normal open walk; And the minimum flow rate of uninterrupted gas prevents that more than or equal to the minimum air flow of ventilated element 3 ventilated element 3 from stopping up because of dying, and another major part is the pulsed gas via repid cut-off valve 5a; Utilize the rapidly opened and closed function of repid cut-off valve; Make pulsed gas by some cycles rule pulsation, uninterrupted gas and pulsed gas converge the back and form continuously uninterrupted and be the stirring gas 4 of cycle pulsation, stir gas 4 and get into the metallic solution formation bubble in the electric furnaces 2 through ventilated element 3; Volumetric expansion when gaseous tension and metal liquid pressure release; Metal liquid is to the gas heating volumetric expansion, and bubble and come-up produce the mixing effect of pulsation in metal pool 1.
Prove through numerical simulation; Employing is the stirring gas 4 of cycle pulsation and selects suitable ebb-flow cycle and pulsation ratio for use, pulsed gas is selected for use suitable peak pulse duration stirring gas 4; As far as more shallow metal pool 1; Consume under the prerequisite at same stirring gas 4; Mixing effect can improve more than 30%～50% with the kinetic energy assessment that metallic solution obtains; And can obtain with prior art in continuously stirring is close in the deep molten bath electric furnace mixing effect, this brings great effect to the design of the electric furnace type of furnace, electric cooker structure design and the operation of electric steel production technique, has overcome to improve the technical limitation that existing electric furnace bottom blowing mixing effect must the bigger increase metal pool degree of depth.
Further; Said normal open walk is provided with and often opens variable valve 5b; Because the minimum air flow that do not stop up of different ventilated elements 3 is different; And in actual production, also having needs to regulate the needs through the uninterrupted gas flow of normal open walk, on normal open walk, is provided with and often opens the minimum flow rate that variable valve 5b is used to regulate uninterrupted gas, and the flow of uninterrupted gas can be set through often opening variable valve 5b off-line.
Further, said flutter generator 5 is arranged on the main line near said ventilated element 3, flutter generator 5 is set on the main line near ventilated element 3 can obtains the mixing effect of better pulsing.The flutter generator 5 of present embodiment is arranged between main control valve 8 and the ventilated element 3.
Further; The metal pool pulsed gas whipping appts of present embodiment also comprises the subsequent use stirring bypass 7 with said main control valve 8 and flutter generator 5 parallelly connected settings; Said subsequent use stirring bypass 7 is provided with normally closed variable valve, and subsequent use stirring bypass 7 is used for when flowrate control valve 8 faults, providing subsequent use.
Further; The metal pool pulsed gas whipping appts of present embodiment also comprises unit 6; Said unit 6 is electrically connected with said gas supply pipe system 9, flutter generator 5, normally closed variable valve and main control valve 8 respectively; Through the fluctuating parameter that unit 6 may command stir gas is set, like peak pulse duration, cycle, each stir spot pulsation phase etc.Often opening variable valve 5b and main control valve 8 can be controlled by unit 6, and regulates the pulsation ratio that stirs gas, and unit 6 is an Industrial Control Computer, like PLC.
Further; Said ventilated element 3 is arranged near said electric furnace 2 tap holes and/or is arranged near the said electric furnace 2 electric-arc heating districts and/or is arranged near the said electric furnace 2 reinforced discharging points; Aborning, issuable cold-zone cold spot or hot spot all are main region that ventilated element 3 need add strong mixing in the metal pool 1, as near the reinforced discharging point with near the cold zone of locating the tap hole etc.; Near and the high-temperature zone the electric-arc heating district; Strengthen the stirring of high-temperature zone and cold zone, can effectively strengthen the convection heat transfer in molten bath, accelerate melting of metal.
To sum up, compare with the metal pool that adopts existing continuous gas to stir, under identical stirring gas consumption; After adopting the metal pool pulsed gas stirring means of present embodiment; As far as the electric furnace of continuous steel scrap charging type, improved the fusing and the drift velocity of blanking district steel scrap, accelerated the heat transfer efficiency of arc energy to steel scrap; Improve the thermo-efficiency of electric furnace system, saved electric energy; After arc region adopted the stirring gas 4 of pulsing to stir, mixing effect improved, and the diffusion of the over-heat metal liquid of accelerate plasma heating improves the molten bath heat transfer and falls the volatilization of substrate under ultra high temp, improves recovery rate of iron; After pulsed gas be installed near the tap hole stirred, improve this cold-zone and the convection current hot-zone, the probability of occurrence of end tap hole obstruction accident falls.
In addition, consider, after gas stirring is stirred in the employing pulsation from the exploitation of furnace operation and electric furnace equipment; Under identical stirring intensity, to same purpose of design, feeding in raw material like sidewall need be than the successive type production type of furnace of deep molten bath; The type of furnace can be done more shallowly, and type of furnace design improves, like this; Electric furnace fascinates when tapping inclination angle etc. can be less; Improved safe, maintenance, reliability to whole furnace equipment, and made furnace operation property comparatively convenient, the electric furnace inclination angle is directly proportional with pool depth on geometry.
Through specific embodiment the embodiment of metal pool pulsed gas stirring means of the present invention is carried out detailed explanation below.
Present embodiment adopts as stated, and the metal pool pulsed gas stirring means of metal pool pulsed gas whipping appts does; The stirring gas 4 that gets into metal pools 1 through said flutter generator 5, main line and ventilated element 3 backs successively is the uninterrupted gas of cyclic fluctuation for flow, and the minimum flow rate of said stirring gas 4 is more than or equal to said ventilated element 3 nonclogging minimum air flows.Preferably; Said stirring gas 4 flows are 0.1-0.9 greater than the time zone and the ratio in said cycle of flow MV in each ebb-flow cycle of said stirring gas 4; The ratio of said stirring gas 4 flow peaks and minimum value is 2-200, adopts such stirring gas 4 can obtain the mixing effect of better pulsing.
Further, when the quantity of said ventilated element 3 during more than or equal to two, the pulsation phase of the stirring gas through each said ventilated element 3 is through at unit 6 controls flutter generator 5 independent control down, and controlled by said unit 6 realization matrixs.When adopting the multiple spot pulsation to stir in the metal pool 1, can select out of phase to realize the further optimization of mixing effect to each pulsating waveform that stirs gas; , stir gas 4 and can under the effect of unit 6, the pulsation of realization matrix phase control stir during abundant and connection and reasonable arrangement when pulsation point in the metal pool 1, and stirring that can appropriateness control metal pool 1 flows, as forming molten bath fluctuation or eddy flow.Pulsation phase difference as herein described is meant the time difference of stirring gas between 4 ebb-flow cycles through each ventilated element 3.
The metal pool pulsed gas stirring means to the comparison present embodiment below in conjunction with concrete is elaborated.
Fig. 3 is the microgas bulk wave shape synoptic diagram in the existing continuously stirring method; At the different operating of electric furnace 2 in the phase; Existing electric furnace bottom blowing has selected different air blowings to stir flow; But in each work period, the flow of the stirring gas 4 through each ventilated element 3 is metastable, is called adjustable continuous air blowing and stirs.
Fig. 4 is for adopting the microgas bulk wave shape synoptic diagram of metal pool pulsed gas stirring means of the present invention, in the phase, also selected different stirring gas 4 flows at the different operating of electric furnace 2; But in each under-stream period, the flow of the stirring gas 4 through each ventilated element 3 is by the pulsation of some cycles rule, in arteries and veins paddy district; Stir gas exhaust velocity subaverage; In the pulse crest district, stir the gas exhaust velocity and be higher than MV, be called pulsed gas and stir.
As shown in the figure, in certain under-stream period, the ebb-flow cycle T that stirs gas 4 generally is far smaller than the time span of under-stream period, and the peak pulse duration described in this paper is meant the ratio of pulse crest district width mean time T1 and cycle T, i.e. T1/T or T1 ＇/T ＇; This paper plants the ratio that described pulsation ratio is meant pulse wave peak value V2 and pulse wave valley V1, i.e. V2/V1 or V2 ＇/V1 ＇.When pulsation is exactly that traditional continuous air blowing is stirred when being 1, when pulsation than being that pulse gas stirs when infinitely great, among this paper when the pulsation ratio more than or equal to 200 the time, mixing effect approaches the pulse gas stirring.
Although it is pointed out that pulsating waveform is an orthogonal in the accompanying drawing, be not limited only to square wave, in fact, because repid cut-off valve 5a switching needs the time, and pipeline volumetrical cushioning effect etc. behind the valve, waveform has certain distortion, as becomes trapezoidal etc.; And repid cut-off valve 5a is meant the mechanism arrangement that can cut off the gas passage.
It should be noted that; The pulse wave valley must not be 0 value during pulsation was in the present invention blown and stirred; The flow that promptly stirs gas 4 is greater than zero, and this is because the production status of electric furnace 2 requires, and is 0 if stir the flow of gas 4; Molten metal in the electric furnace bath 1 infiltrates the thin gas tube of ventilated element 3 easily under action of gravity, can make ventilated element 3 obstructions and cause thrashing.
Through design of Simulation the metal pool pulsed gas stirring means of present embodiment is analyzed below.
The metal pool pulsed gas stirring means of embodiment is assessed based on Numerical Simulation Analysis; During analysis; Through the type of furnace is simplified, suppose that electric furnace 2 is provided with two ventilated elements 3, and respectively this metal pool 1 model is carried out uninterrupted gas stirring, pulsed gas stirring, pulse gas stirring; And analyze emulated data such as following table with different electric furnaces 2 degree of depth:
Simulation result such as Fig. 5, Fig. 6 and shown in Figure 7, numerical simulation shows:
1) effect of continuous gas stirring, with metal pool 1 degree of depth increases, promptly the aspect ratio of metal pool 1 increases, total mixing effect obviously promotes;
2) behind the employing pulsed gas stirring technique, selecting suitable ebb-flow cycle, peak pulse duration and pulsation ratio, as far as more shallow electric furnace 2, under same gas consumption prerequisite, mixing effect can improve more than 30%～50% with the kinetic energy assessment that molten steel obtains;
3) pulsed gas stirs improving effect and can descend than deep molten bath (aspect ratio increase);
4) to the employing of the electric furnace 2 of shallow metal pool 1 during than the atmospheric continuously stirring; Very easy generation air guide post in the molten steel; This can reduce the utilising efficiency that stirs gas 4 greatly, and the pulsed gas bottom blowing can suppress gas column generation in the more shallow metal pool 1, improves gas stirring efficient;
5) consume identical stirring gas 4, the stirring range of influence that pulsed gas stirs is bigger, the better effects if of stirring.
From above-mentioned data analysis, see from production operation and equipment design point of view:
1) behind the employing pulsed gas stirring technique, under same stirring intensity, can reduce gas consumption, improve the economy of electric furnace 2 production and operations,
2) behind the employing pulsed gas stirring technique; More shallow electric furnace 2 can obtain near the deep molten bath electric furnace mixing effect that adopts continuously stirring; This brings great effect to the design of the electric furnace type of furnace, the operation of electric cooker structure design and processes; And overcome and improve electric furnace and stir the technical limitation that the bottom blowing effect must increase the electric furnace degree of depth, make that the aspect ratio of electric furnace 2 when design can be littler, optimized the operation of equipment design and processes.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. metal pool pulsed gas whipping appts; Comprise at least one ventilated element and the microgas body feeding that links to each other with said ventilated element of being arranged on the electric furnace bottom; It is characterized in that: said microgas body feeding comprise gas supply pipe system and with the main line of the corresponding one by one setting of said ventilated element; Said main line links to each other with gas supply pipe system with ventilated element respectively; Said main line is provided with main control valve and flutter generator, and said flutter generator comprises the normal open walk of repid cut-off valve and parallelly connected setting with said repid cut-off valve.
2. metal pool pulsed gas whipping appts according to claim 1 is characterized in that: said normal open walk is provided with often drives variable valve.
3. metal pool pulsed gas whipping appts according to claim 2, it is characterized in that: said flutter generator is arranged on the main line near said ventilated element.
4. metal pool pulsed gas whipping appts according to claim 3 is characterized in that: also comprise the subsequent use stirring bypass of parallelly connected setting with said main control valve and flutter generator, said subsequent use stirring bypass is provided with normally closed variable valve.
5. metal pool pulsed gas whipping appts according to claim 4 is characterized in that: also comprise unit, said unit is electrically connected with said gas supply pipe system, flutter generator, normally closed variable valve and main control valve respectively.
6. according to each described metal pool pulsed gas whipping appts of claim 1-5, it is characterized in that: said ventilated element is arranged near the said tap holes of electric furnace and/or is arranged on said electric furnace electric-arc heating district's annex and/or is arranged near the said electric furnace charging discharging point.
7. the metal pool pulsed gas stirring means of an employing such as each said metal pool pulsed gas whipping appts of claim 1-6; It is characterized in that: be the uninterrupted gas that flow is cyclic fluctuation through the stirring gas that gets into metal pool behind said flutter generator, main line and the ventilated element successively, and the minimum flow rate of said stirring gas is more than or equal to the nonclogging minimum air flow of said ventilated element.
8. metal pool pulsed gas stirring means according to claim 7 is characterized in that: flow is 0.1-0.9 greater than the time zone and the ratio in said cycle of said stirring gas flow MV in each ebb-flow cycle of said stirring gas.
9. metal pool pulsed gas stirring means according to claim 8 is characterized in that: the ratio of said stirring gas flow peak and minimum value is 2-200.
10. metal pool pulsed gas stirring means according to claim 9; It is characterized in that: when the quantity of said ventilated element during more than or equal to two; The pulsation phase of the stirring gas through each said ventilated element is through said flutter generator independent control, and by said unit realization matrix control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100154299A CN102559993A (en) | 2012-01-18 | 2012-01-18 | Device and method for stirring metallic molten pool by using pulsating gas |
| PCT/CN2012/083281 WO2013107195A1 (en) | 2012-01-18 | 2012-10-22 | Pulsed-gas based agitation device and method for metal melting pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100154299A CN102559993A (en) | 2012-01-18 | 2012-01-18 | Device and method for stirring metallic molten pool by using pulsating gas |
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| CN102559993A true CN102559993A (en) | 2012-07-11 |
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| WO (1) | WO2013107195A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013107195A1 (en) * | 2012-01-18 | 2013-07-25 | 中冶赛迪工程技术股份有限公司 | Pulsed-gas based agitation device and method for metal melting pool |
| CN106609825A (en) * | 2015-10-26 | 2017-05-03 | 熵零股份有限公司 | Speed change mechanism |
| CN108588438A (en) * | 2018-06-01 | 2018-09-28 | 福建麦特新铝业科技有限公司 | A kind of Metal Melting method and smelting furnace |
| CN109990506A (en) * | 2019-04-09 | 2019-07-09 | 山东大学 | A kind of pulsation heat exchanger and its deep well heat exchanging system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112036101B (en) * | 2020-11-03 | 2021-01-15 | 北京科技大学 | Electric arc furnace steelmaking molten pool simulation device, simulation system and method for simulating and measuring temperature of melt in molten pool by using simulation system |
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Cited By (6)
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| WO2013107195A1 (en) * | 2012-01-18 | 2013-07-25 | 中冶赛迪工程技术股份有限公司 | Pulsed-gas based agitation device and method for metal melting pool |
| CN106609825A (en) * | 2015-10-26 | 2017-05-03 | 熵零股份有限公司 | Speed change mechanism |
| CN108588438A (en) * | 2018-06-01 | 2018-09-28 | 福建麦特新铝业科技有限公司 | A kind of Metal Melting method and smelting furnace |
| CN108588438B (en) * | 2018-06-01 | 2020-07-17 | 福建麦特新铝业科技有限公司 | Metal smelting method and smelting furnace |
| CN109990506A (en) * | 2019-04-09 | 2019-07-09 | 山东大学 | A kind of pulsation heat exchanger and its deep well heat exchanging system |
| CN109990506B (en) * | 2019-04-09 | 2020-03-27 | 山东大学 | Pulsating heat exchanger and deep well heat exchange system thereof |
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| WO2013107195A1 (en) | 2013-07-25 |
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