CN101993969B - Converter bottom blowing air brick and using method thereof - Google Patents
Converter bottom blowing air brick and using method thereof Download PDFInfo
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- CN101993969B CN101993969B CN200910056782A CN200910056782A CN101993969B CN 101993969 B CN101993969 B CN 101993969B CN 200910056782 A CN200910056782 A CN 200910056782A CN 200910056782 A CN200910056782 A CN 200910056782A CN 101993969 B CN101993969 B CN 101993969B
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Abstract
The invention provides a converter bottom blowing air brick and a using method thereof. The brick mainly comprises a core brick, an air inlet pipe and an air capillary pipe, wherein the air capillary pipe is arranged in the core brick. The brick is characterized in that the air capillary pipe is 200-400mm shorter than the core brick. Through the building relation of combining the traditional air core brick and the air core brick of the invention, the service life relay form of the bottom blowing air brick is realized to prolong the bottom blowing service life so as to achieve the purpose of improving the age of the converter, and meanwhile, good bottom blowing air permeability can be maintained in the whole converter service period. Because the improved bottom blowing air bricks are together built while building the converter, the problem of potential safety hazard of molten steel leakage while hot replacing the air bricks on line is solved.
Description
Technical field
The present invention relates to steelmaking technical field, specifically, the present invention relates to a kind of converter bottom-blown air brick and method of use thereof.
Background technology
The ventilative core brick of the combined blown converter of current use mainly comprises core brick, inlet pipe and ventilative kapillary; The axial sectional view of its structure is as shown in Figure 1; Wherein whole brick is formed by the magnesia carbon refractory compacting, and inlet pipe is connected with the air-supply duct at converter bottom blowing valve station, and 48 ventilative kapillaries are arranged in the brick; Consistent with the length of ventilative core brick, it distributes shown in the A-A sectional view.When the converter opening new furnace, bottom blown gas can be blown in the stove from ventilative kapillary, plays the effect of stirring molten steel.
But the molten steel of stirring can cause ventilative core brick and overlap the brick erosion rate fast.All there be the bottom blowing life-span problem shorter than lining life in present domestic top and bottom combined blown converter after adopting Technology of Slag Splashingfor Furnace Maintenance.Address this problem the two kinds of methods that mainly contain:
One, the ventilative core brick of online hot swap bottom blowing; Promptly when furnace lining is in the red heat state, will corrode serious ventilative core brick replaces with new ventilative core brick; Thereby improve the life-span of bottom blowing; Reach and improve the combined blown converter purpose in furnace life, guarantee whole stove labour simultaneously during bottom blowing air permeability good, satisfy the processing requirement of smelting high standard steel grade (requiring less than 0.01% etc.) like the finished product phosphorus content.But there is following shortcoming in this method: 1) there is the security hidden trouble of molten steel seepage in the way of online hot swap bottom-blown air brick; 2) the new ventilative core brick of changing corrodes very fast, can not obviously improve the bottom blowing life-span; 3) change ventilative core brick and need stop to produce about 8 hours, influence production schedule; 4) labour cost of core brick expense and replacing core brick is higher, about 20,000 yuan of the expense of 1 core brick of 150t converter replacing.
Two, do not change ventilative core brick, adopt the stove labour later stage to close the way of bottom-blown air brick, reduce gas permeable brick and reach the erosion rate of working brick on every side, improve the bottom blowing life-span, reach the purpose that improves furnace life.But also there is shortcoming in this method, and after bottom-blown air brick was closed, bottom blowing was stirred the function of molten steel and also will lose, can not smelt high standard steel grade (like the requirement of finished product phosphorus content less than 0.01% etc.).
Therefore; In order to solve the top and bottom combined blown converter bottom blowing life-span problem lower, be necessary to invent a kind of novel converter bottom-blown air brick, to improve converter lining life than lining life; Bottom blowing air permeability is good during guaranteeing whole stove labour; Satisfy to smelt the processing requirement of high standard steel grade, avoid the security hidden trouble of molten steel seepage, reduce the influence of producing simultaneously and reduce expenses.
Summary of the invention
The present invention provides a kind of converter bottom-blown air brick, mainly comprises core brick, inlet pipe and ventilative kapillary, and said ventilative kapillary is arranged in the said core brick, it is characterized in that, said ventilative kapillary is than the short 250～300mm of said core brick.
According to converter bottom-blown air brick of the present invention, preferably, said ventilative kapillary is than the short 250～300mm of said core brick.
According to converter bottom-blown air brick of the present invention, preferably, said ventilative capillary bore internal diameter is 1-3mm.
According to converter bottom-blown air brick of the present invention, preferably, said ventilative kapillary top seal.
The present invention also provides the method for use of this converter bottom-blown air brick; Said gas permeable brick and existing gas permeable brick distribute in the converter interval and build by laying bricks or stones; When the converter opening new furnace; Close the steam supply valve at said gas permeable brick bottom blowing valve station, open the steam supply valve at existing gas permeable brick bottom blowing valve station, converter is blown stir molten steel; When treating that the air port working brick eats away near 200mm at the bottom of the said gas permeable brick, open steam supply valve in advance to said gas permeable brick air feed, when treating that the ventilative kapillary of said gas permeable brick is exposed, ventilation is automatically in time taken over existing gas permeable brick and converter is blown is stirred molten steel; Looking the erosion condition of existing ventilative core brick closes it one by one.
Existing ventilative core brick is consistent with the ventilative capillary pipe length in it, and bottom blown gas just can be blown in the stove from ventilative kapillary during the converter opening new furnace, plays the effect of stirring molten steel, and the molten steel of stirring can cause ventilative core brick and overlap the brick erosion rate fast.Ventilative core brick of the present invention is on the basis of existing ventilative core brick, to have shortened inner ventilative length capillaceous, and stove labour does not have bottom blown gas from ventilative kapillary, be blown in the stove early stage like this, can not stir molten steel, so ventilative core brick and to overlap the brick erosion rate slow.Along with the continuous increase of smelting furnace number, corrode slow ventilative core brick and begin to expose at ventilative kapillary of stove labour later stage, at this moment in time open bottom blown gas, just can play the effect of stirring molten steel to the converter air feed.
Converter is when building by laying bricks or stones; Gas permeable brick of the present invention and existing gas permeable brick distribute in the converter interval and build (as shown in Figure 3) by laying bricks or stones; Promptly 4 existing ventilative core bricks and 4 spaced apart building by laying bricks or stones of ventilative core brick of the present invention (the breathe freely quantity of core brick of existing ventilative core brick and the present invention can be respectively 3,4,5,6; For the ease of narration, be that example is described) with 4 here.Such 4 existing ventilative core bricks guarantee the stove labour bottom blowing effect in early stage; When the ventilative kapillary of treating 4 ventilative core bricks of the present invention exposes; By these 4 ventilative core bricks continuation the converter air feed is guaranteed the stove bottom blowing effect in labour later stage, look the erosion condition of 4 existing ventilative core bricks again and close one by one, make these 4 ventilative core bricks and the residual thick progressively increase of working brick on every side; And then improve the bottom blowing life-span, improve furnace life.
Ventilative core brick of the present invention is on the basis of existing ventilative core brick, to have shortened inner ventilative length capillaceous, and stove labour does not have bottom blown gas from ventilative kapillary, be blown in the stove early stage like this, can not stir molten steel, so ventilative core brick and to overlap the brick erosion rate slow.Along with the continuous increase of smelting furnace number, corrode slow ventilative core brick and begin to expose at ventilative kapillary of stove labour later stage, at this moment in time open bottom blown gas, just can play the effect of stirring molten steel to the converter air feed, can guarantee the bottom blowing effect and improve furnace life.
Beneficial effect of the present invention is:
The present invention can avoid online hot swap gas permeable brick to have the security hidden trouble of molten steel seepage; Can obviously improve the bottom blowing life-span; Reach the purpose that improves furnace life, keep during the whole stove labour good bottom blowing air permeability being arranged all simultaneously, can satisfy the processing requirement of smelting the high standard steel grade; Compare with online hot swap gas permeable brick form, can also practice thrift ventilative core brick and hot swap executive cost.
Description of drawings
Fig. 1 is existing ventilative core brick axial section synoptic diagram;
Fig. 2 is a ventilative core brick axial section synoptic diagram of the present invention;
The wherein whole brick that is pressed into of the ventilative kapillary of 1-, 2-magnesia carbon refractory, the inlet pipe of 3-bottom-blown air brick.
Fig. 3 builds distribution schematic diagram by laying bricks or stones for converter bottom-blown air brick of the present invention, wherein the existing ventilative core brick of 1#-, the ventilative core brick, 12 of 2#-the present invention, 13-cover brick, 14-brick cup.
Embodiment
Below combine accompanying drawing that the present invention is made more detailed description with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment:
Ventilative core brick axial section is as shown in Figure 2, and the inlet pipe 3 of bottom-blown air brick is connected with the air-supply duct at converter bottom blowing valve station, and whole brick 2 is formed by the magnesia carbon refractory compacting, and ventilative kapillary 1 has 48, and the B-B sectional view is seen in its distribution.Ventilative kapillary is than the short 250～300mm of core brick.
Converter is when building by laying bricks or stones, and bottom-blown air brick adopts distribution relation shown in Figure 3 to build by laying bricks or stones, i.e. 4 existing ventilative core brick 1# and 4 the present invention spaced apart building by laying bricks or stones of core brick 2# of breathing freely, and every road gas is independently controlled.Existing so ventilative core brick 1# guarantees the stove labour bottom blowing effect in early stage, and when stove labour reached the later stage, the blind brick section in top of the ventilative core brick 2# of the present invention can be etched, and exposes ventilative kapillary.The ventilative kapillary top of the ventilative core brick 2# of the present invention is sealed with spot welding, when its with after molten steel contact, molten steel can melt the part of spot welding, continues the converter air feed is stirred converter molten steel, uses as a servant the bottom blowing effect in later stage with the assurance stove, its bottom blowing intensity can reach 0.1Nm
3(normal process uses maximum bottom blowing intensity to be 0.1Nm to/t
3/ t) satisfy processing requirement., again look the erosion condition of existing ventilative core brick 1# one by one close, make existing ventilative core brick 1# and the residual thick progressively increase of working brick on every side, and then improve the bottom blowing life-span, improve furnace life thereafter.
Among the present invention, ventilative kapillary top belongs to blind brick section with interval between the core brick top, and when the continuous increase of furnace bottom working brick along with the smelting furnace number, when eating away 250mm～300mm, ventilative kapillary exposes, and can leave ventilation automatically and playing the effect to the molten steel stirring.Can open ventilation when exposing in order to ensure ventilative kapillary; Can adopt following three technology: 1, adopt laser thickness gauge regularly to detect furnace bottom thickness; When furnace bottom air port working brick eats away 200mm, just open the breather valve of the ventilative core brick 2# of the present invention, make gas be full of ventilative kapillary in advance; When treating that ventilative kapillary exposes, ventilation automatically in time; 2, the ventilative capillary bore of the ventilative core brick 2# of the present invention is that the stainless steel tube of 2mm is processed by internal diameter, and the sealing of spot welding form is adopted at its top; 3, can make bleed pressure be stabilized in 0.8～1.1MPa after the decompression of bottom blowing valve station, and the blind brick section in core brick of the present invention top can be born the pressure of 1.5MPa, can guarantee that the core pipe is not damaged greatly by air pressure.
4 existing ventilative core brick 1# and 4 ventilative spaced apart building by laying bricks or stones of core brick 2# of the present invention, every road gas is independently controlled, and not only can guarantee the bottom blowing effect of whole stove labour phase, can satisfy the processing requirement of smelting the high standard steel grade, can also obviously improve converter lining life.Simultaneously owing to brickwork joint when building by laying bricks or stones can adopt the silica sand refractory materials to replenish, so can avoid the security hidden trouble of molten steel seepage.Than the ventilative core brick economy of hot swap, each stove stove labour can be practiced thrift 80,000 yuan.
Claims (3)
1. converter bottom-blown air brick; Mainly comprise core brick (2), inlet pipe (3) and ventilative kapillary (1); Said ventilative kapillary (1) is arranged in the said core brick (2), it is characterized in that, said ventilative kapillary (1) is than the short 200～400mm of said core brick (2); Said ventilative kapillary (1) hole internal diameter is 1-3mm, said ventilative kapillary (1) top seal.
2. converter bottom-blown air brick as claimed in claim 1 is characterized in that, said ventilative kapillary (1) is than the short 250～300mm of said core brick (2).
3. the method for use of a converter bottom-blown air brick; Said gas permeable brick mainly comprises core brick (2), inlet pipe (3) and ventilative kapillary (1), and said ventilative kapillary (1) is arranged in the said core brick (2), it is characterized in that; Said ventilative kapillary (1) is than the short 200～400mm of said core brick (2); Said gas permeable brick and existing gas permeable brick distribute in the converter interval and build by laying bricks or stones, when the converter opening new furnace, close the steam supply valve at said gas permeable brick bottom blowing valve station; Open the steam supply valve at existing gas permeable brick bottom blowing valve station, converter is blown stir molten steel; When the blind brick section in top of treating the core brick of said gas permeable brick is etched near 200mm; Open steam supply valve in advance to said gas permeable brick air feed; When treating that the ventilative kapillary (1) of said gas permeable brick is exposed, ventilation is automatically in time taken over existing gas permeable brick and converter is blown is stirred molten steel; Looking the erosion condition of existing ventilative core brick closes it one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056782A CN101993969B (en) | 2009-08-21 | 2009-08-21 | Converter bottom blowing air brick and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056782A CN101993969B (en) | 2009-08-21 | 2009-08-21 | Converter bottom blowing air brick and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101993969A CN101993969A (en) | 2011-03-30 |
| CN101993969B true CN101993969B (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910056782A Active CN101993969B (en) | 2009-08-21 | 2009-08-21 | Converter bottom blowing air brick and using method thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193022A (en) * | 2018-03-19 | 2018-06-22 | 洛阳轩石高温材料有限公司 | Argon is to extend the method for bottom blowing monolithic devices air brick comprehensive life successively |
| CN110578033B (en) * | 2019-09-24 | 2021-11-23 | 张家港宏昌钢板有限公司 | Converter bottom blowing replacement method |
| CN111518982A (en) * | 2020-04-21 | 2020-08-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving full-furnace-service bottom blowing stirring effect of steel-making furnace |
| CN112226573A (en) * | 2020-09-10 | 2021-01-15 | 包头钢铁（集团）有限责任公司 | Control method for preventing pear-shaped furnace lining of converter |
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| CN101993969A (en) | 2011-03-30 |
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