CN100439517C - Terminal low-oxygen control method for top bottom combined blowing converter - Google Patents
Terminal low-oxygen control method for top bottom combined blowing converter Download PDFInfo
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- CN100439517C CN100439517C CNB2007100520769A CN200710052076A CN100439517C CN 100439517 C CN100439517 C CN 100439517C CN B2007100520769 A CNB2007100520769 A CN B2007100520769A CN 200710052076 A CN200710052076 A CN 200710052076A CN 100439517 C CN100439517 C CN 100439517C
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Abstract
The invention discloses a low-oxygen controlling method of blowing converter, which is characterized by the following: increasing blowing quantity for converter (1); deroppilating air brick when not working through connecting air pipe (3) on the air element (2) of converter (1); making the pressure of air element (2) less than the other end pressure of air pipe (3); reducing energy consumption; increasing the efficiency of the same quantity of flow as well as fused steel quality obviously.
Description
Technical field
The present invention relates to a kind of low-oxygen control method of combined blown converter.
Background technology
Steelmaking process is an oxidising process, makes oxidations such as carbon, silicon, manganese, phosphorus by being blown into oxygen, obtains the molten steel of different carbon contents.When blowing terminal point, dissolved too much oxygen (being called dissolved oxygen [O] r) in the invar water, must carry out deoxidation during tapping, promptly dissolved oxygen is transformed into oxide inclusion.Oxygen level in the common steel in total oxygen content=dissolved oxygen content+inclusion (be ω T[O]=ω [O] r+ ω [O] i).In order to improve the purity of molten steel, must reduce the total oxygen content in the steel.Tapping oxygen is when high, generation once many with the secondary deoxidation products, and the whole bag of tricks that adopts in follow-up refining and casting process can only be removed the inclusion that part generates.Because the oxygen height can produce a large amount of oxidisability inclusiones behind deoxidation alloying, influence the quality of steel, deoxidation products causes slab quality to degenerate at the continuous casting mouth of a river that results in blockage; The mass consumption of reductor also makes cost increase simultaneously.This shows that converter terminal molten steel oxygen level is the essential condition of endogenous inclusion quantity in the decision steel, the oxygen level in steelmaking process in the control steel is particularly important.
The method that low-oxygen steel is produced in converter generally is: long-pending by combined blown converter control end point carbon oxygen, suitable terminal point measure of control are avoided Molten Steel over-oxidation.The main deficiency of this method is bottom blown gas tolerance deficiency, and especially not enough to the stirring of molten steel when the later stage, reaction between carbon and oxygen slowed down in blowing, end point carbon oxygen is long-pending higher.
Find in the real work that the tolerance size of bottom blown gas not only is decided by the production method of low-oxygen steel, simultaneously, the ventilative area of converter gas permeable brick also is the key factor that influences the bottom blown gas air input.In fact, impurity often appears in the gas permeable brick inlet mouth, and constantly the impurity of accumulation often stops up passing through of air-flow, but people often only consider to improve the increase that realizes airshed from technological process, has but ignored gas permeable brick impurity blocking problem.
Summary of the invention
At there being the insufficient problem of bottom blown gas tolerance in the present combined blown converter smelting process, the invention provides a kind of low-oxygen control method, long-pending by atm number combined blown converter bottom blowing reduction smelting endpoint carbon oxygen, avoid Molten Steel over-oxidation.
Purpose of the present invention realizes by following scheme:
A kind of atm number top and bottom combined blown converter terminal point low-oxygen control method, control converter 1 multiple air-blowing quantity of gas permeable brick when work increases, promptly when the converter inoperative, dredge gas permeable brick, concrete mediation measure is, connect ventilative pipeline 3 on the ventilated element 2 of converter 1, the pressure at control ventilated element 2 places is less than the pressure of ventilative pipeline 3 the other ends.
Further, the pressure at control ventilated element 2 places less than the concrete grammar of the pressure of ventilative pipeline 3 the other ends is: dredger is set, dredger is formed by straight pipeline 4 with the other pipeline 5 of these straight pipeline 4 side joints, and described other pipeline 5 is tightly connected with straight pipeline 4 and forms acute angle;
The interface 5-1 of described other pipeline 5 is connected with ventilative pipeline 3, at the end connection source of the gas of straight pipeline 4, described source of the gas be connected on the straight pipeline 4 with the interface 4-1 of other pipeline 5 near an end on.
Further, ventilated element 2 is six～ten, is evenly distributed on two circles of furnace bottom different diameter.
Further, utilize variety steel control furnace bottom rising in the middle and later periods of stove labour.
The present invention has the beneficial effect of following aspect:
The present invention guarantees multiple air blowing flow from the gas permeable brick angle, has reduced energy loss, has increased the efficient of isodose air-flow, has improved steel quality and has reduced production cost.
In the process of the test in several years of Wuhan Iron and Steel Plant two steelworkss, find, adopt the method for the invention that the controlled levels of tapping oxygen is improved constantly, the converter tapping terminal point oxygen (all steel clock) of on average tapping drops to 492ppm (deciding several 3183 stoves of the effective stove of oxygen) in 2005,476ppm (deciding several 3157 stoves of the effective stove of oxygen) in 2006 by 517ppm in 2004 (deciding several 3078 stoves of the effective stove of oxygen), blow long-pending 0.0024 the level that reaches of end point carbon oxygen again, therefore be beneficial to and apply.
Description of drawings
Fig. 1 is converter and dredger syndeton synoptic diagram;
Fig. 2 is a dredger principle of work synoptic diagram;
Fig. 3 is the floor map of ventilated element position.
Embodiment
Present embodiment provides a kind of atm number top and bottom combined blown converter terminal point low-oxygen control method, controlling converter 1 multiple air-blowing quantity of gas permeable brick when work exactly increases, one of measure of control of this method promptly are mediation gas permeable bricks when the converter inoperative, concrete mediation measure is, connect ventilative pipeline 3 on the ventilated element 2 of converter 1, the pressure at control ventilated element 2 places is less than the pressure of ventilative pipeline 3 the other ends.
Pressure difference by ventilative pipeline 3 two ends can have high mediation efficient easily with the impurity sucking-off in the ventilated element 2, thereby avoids impurity to stop up gas channel and influence air-blowing quantity.The present invention guarantees multiple air blowing flow from the gas permeable brick angle, has reduced energy loss, has increased the efficient of isodose air-flow, has improved steel quality and has reduced production cost.
Particularly, ventilative pipeline 3 two ends of control pressure difference method occurs and are preferably, and dredger is set, and see figures.1.and.2, described dredger is formed by straight pipeline 4 with the other pipeline 5 of these straight pipeline 4 side joints, and described other pipeline 5 is tightly connected with straight pipeline 4 and forms acute angle;
The interface 5-1 (being multiple blowpipe pipeline joint) of described other pipeline 5 is connected with ventilative pipeline 3, at the end connection source of the gas of straight pipeline 4, described source of the gas be connected on the straight pipeline 4 with the interface 4-1 of other pipeline 5 near an end on.
During work, with the straight pipeline interface 4-1 of other pipeline 5 near an end on be connected source of the gas, insert bottom blowing nitrogen from this gas source interface, multiple blowpipe pipeline joint place inserts the ventilative pipeline of the gas permeable brick that needs mediation.If the pressure in the other pipeline is P1, pressure in the straight pipeline is P2, from gas source interface blowing gas stream in straight pipeline, because converter is in off working state, pressure in the therefore other pipeline is 0, and the out-of-date interior pressure P 2 of straight pipeline that will make of air communication being arranged in the straight pipeline greater than the pressure P in the other pipeline 1, the pressure difference that P1, P2 produce will be extracted the impurity in the ventilated element out, thereby reaches the purpose of mediation gas permeable brick.
Another measure that control combined blown converter bottom blowing tolerance increases is exactly the number that increases ventilated element.Ventilated element in the converter now is four, exists the little problem of airshed.Present embodiment is increased to six～ten with four present ventilated elements, it can be six, seven, eight, nine, ten, also can according to circumstances be provided with more, the increase of quantity can guarantee again the increase of the amount of blowing, thereby provides assurance for the quality that improves steel.With reference to Fig. 3, all ventilated elements are evenly distributed on two circles of furnace bottom different diameter, can control multiple air blowing body like this and on average enter into molten steel.
Utilize smelting variety steel control furnace bottom rising in the middle and later periods of stove labour.In the practical application, can rationally arrange variety steel at the situation of furnace bottom, suitable many smelting low carbons, ultra low-carbon steel during furnace bottom rising, the soft steel oxidisability is strong, can strengthen the erosion to furnace bottom.
Simultaneously, can change thin metal pipe formula bottom blowing ventilated element into circular seam type furnace bottom air feeder in the practical application, can reach better air feed effect.
Claims (4)
1. atm number top and bottom combined blown converter terminal point low-oxygen control method, it is characterized in that controlling converter (1) multiple air-blowing quantity of gas permeable brick when work increases, promptly when the converter inoperative, dredge gas permeable brick, concrete mediation measure is, go up the ventilative pipeline (3) of connection at the ventilated element (2) of converter (1), the pressure that control ventilated element (2) is located is less than the pressure of ventilative pipeline (3) the other end.
2. atm number top and bottom combined blown converter terminal point low-oxygen control method according to claim 1, it is characterized in that being provided with dredger, described dredger is formed by straight pipeline (4) with the other pipeline (5) of this straight pipeline (4) side joint, and described other pipeline (5) is tightly connected with straight pipeline (4) and forms acute angle;
The interface (5-1) of described other pipeline (5) is connected with ventilative pipeline (3), connects source of the gas at an end of straight pipeline (4), and described source of the gas is connected on the straight pipeline (4) and on the interface (4-1) of other pipeline (5) near an end.
3. atm number top and bottom combined blown converter terminal point low-oxygen control method according to claim 1 is characterized in that ventilated element (2) is six～ten, is evenly distributed on two circles of furnace bottom different diameter.
4. according to claim 1,2 or 3 described atm number top and bottom combined blown converter terminal point low-oxygen control methods, it is characterized in that utilizing smelting variety steel control furnace bottom rising in the middle and later periods of stove labour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100520769A CN100439517C (en) | 2007-04-30 | 2007-04-30 | Terminal low-oxygen control method for top bottom combined blowing converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100520769A CN100439517C (en) | 2007-04-30 | 2007-04-30 | Terminal low-oxygen control method for top bottom combined blowing converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101041865A CN101041865A (en) | 2007-09-26 |
| CN100439517C true CN100439517C (en) | 2008-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100520769A Expired - Fee Related CN100439517C (en) | 2007-04-30 | 2007-04-30 | Terminal low-oxygen control method for top bottom combined blowing converter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363881B (en) * | 2020-03-31 | 2021-05-07 | 钢铁研究总院 | Method for reducing free oxygen content of converter end-point metal molten pool |
| CN111876550A (en) * | 2020-06-29 | 2020-11-03 | 武汉钢铁有限公司 | Method and device for controlling furnace bottom gas supply of top-bottom combined blown converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318014A (en) * | 1986-07-09 | 1988-01-25 | Nippon Kokan Kk <Nkk> | Method for controlling flow rate of bottom blowing gas for metallurgical refining furnace |
| CN2546454Y (en) * | 2002-05-29 | 2003-04-23 | 宝山钢铁股份有限公司 | Converter antiplugging apparatus |
-
2007
- 2007-04-30 CN CNB2007100520769A patent/CN100439517C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318014A (en) * | 1986-07-09 | 1988-01-25 | Nippon Kokan Kk <Nkk> | Method for controlling flow rate of bottom blowing gas for metallurgical refining furnace |
| CN2546454Y (en) * | 2002-05-29 | 2003-04-23 | 宝山钢铁股份有限公司 | Converter antiplugging apparatus |
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| Publication number | Publication date |
|---|---|
| CN101041865A (en) | 2007-09-26 |
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Granted publication date: 20081203 Termination date: 20160430 |