CN101260456A - Modification of molten iron pretreatment pipe bend spray gun structure and optimization of refractory materials used for the same - Google Patents
Modification of molten iron pretreatment pipe bend spray gun structure and optimization of refractory materials used for the same Download PDFInfo
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- CN101260456A CN101260456A CNA2008100346201A CN200810034620A CN101260456A CN 101260456 A CN101260456 A CN 101260456A CN A2008100346201 A CNA2008100346201 A CN A2008100346201A CN 200810034620 A CN200810034620 A CN 200810034620A CN 101260456 A CN101260456 A CN 101260456A
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- spray gun
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Abstract
The invention relates to an improvement of the molten iron pre-treating syphon ejection gun structure and the optimization design of using a refractory. The invention is characterized in that: 1. the thickness of the refractory wrapped outside the ejection gun is changed from the size-graded structure into that the upper thinnest part is 10 millimeter and the thickness ratio of the refractory of the middle part and the lower part is adjusted to 1.15 to 1.25 instead of the prior thickness ratio of 0.85; moreover, the cross section of the ejection gun syphon is changed from a hexagon into an ellipse; 2. the metal micro powder is added into the refractory wrapped outside the ejection gun; the melting point is lower than 1400 DEG C, the thermal shock resistance of the ejection gun is further improved by the liquid phase plastic toughness reinforcing mechanism. By the improvements in the two aspects, the average service life is up to 6.42 furnaces after the practical use of furnace, which is obviously lower than the service life of the furnace 5.
Description
Technical field
The present invention relates to the optimization design of the refractory materials of a kind of improvement of molten iron pretreatment elbow spray gun structure and use, belong to metal mixer car with spray gun and fire resisting material field.
Background technology
Hot metal pretreatment is to be applied on the 250t metal mixer car molten iron to be carried out three to take off the instrument of processing with J type elbow spray gun, during use its oblique cutting is advanced in the molten iron of metal mixer car, makes carrier by spray gun inner core steel pipe with N2 gas and carries CaO, CaC
2, CaF
2Or Na
2CO
3, in molten iron, molten iron is taken off S, takes off P and replenishes the processing of taking off Si in pulvis, with the impurity element of the sulphur in reduction or the elimination molten iron, phosphorus, silicon etc.Use as shown in Figure 1.
The inner core of spray gun is a steel pipe, and the outer wrap refractory materials is generally high-performance mullite matter mould material.Because three of bridge piece spray gun takes off device certain load-bearing requirement is arranged, and promptly requires the gross weight of spray gun to be no more than 95 kilograms, so spray gun removes outside the steel core about 31 kilograms, requires outside anti-material thinner, the thinnest part 10mm that only has an appointment.Since spray gun when at high temperature dusting agent steel pipe be heated the after rate much larger than the refractory materials of outside, easily crack the destruction refractory materials; While because of molten iron stirs, the spray gun shake is very violent, easily produces mechanical crackle in preprocessing process; Spray gun repeatedly injects in molten iron and extracts, and temperature variation Da Yi produces the thermal shock crackle, so the damage form of elbow spray gun causes molten iron to ooze to the steel pipe inner core to bore a hole or rupture for cracking because of refractory materials, mean life less than 5 stoves.
The rifle type structure system that uses at present introduces from Kawasaki, Japan, and as shown in Figure 2, whole spray gun be refractory material outside layer thickening gradually from top to bottom.The elbow, bottom of spray gun is immersed in the molten iron fully during use, and the middle part is in the intersection of molten iron, scum and air, and upper exposed is in air.The refractory materials of bottom is because of being immersed in the high temperature liquid iron, and the thermal shock the when mechanical shaking when therefore being subjected to using, the erosion of high temperature liquid iron and reeve are extracted is prone to crackle in the use; The middle part of rifle not only is subjected to the common erosion and the mechanical shaking of iron, slag owing to be in iron, slag and air intersection, also because the anti-material inequality of being heated vertically herein causes the work-ing life that is prone to crackle very much herein and influences whole rifle; Washing away of the top of a rifle heated air, working conditions is best, promptly uses condition least harsh.
Summary of the invention
Material and the unreasonable present situation of design based on the refractory materials of present widely used rifle type structure and use, the object of the present invention is to provide the optimization design of the refractory materials of a kind of improvement of molten iron pretreatment elbow spray gun structure and use, the present invention includes following two parts.
One, the improvement of rifle type structure
As mentioned above because the middle part working conditions of rifle is the harshest, the bottom secondly, top is not fragile basically, and is grading structure with the thickness of anti-material of rifle type now, obviously has irrationality.Mostly from the damage situation of using the back rifle is because the perforation and the fracture at middle part cause also, therefore to improve the structure of rifle type, the refractory materials thinnest part on top still remains on about 10mm, to guarantee refractory materials energy casting herein, suitable attenuate bottom refractory thickness, thicken the middle part refractory materials simultaneously, with in, the thickness of bottom refractory materials adjusts to about 1.15～1.25 than by about 0.85, in recommending, the thickness ratio of bottom refractory materials is 1.20, the structure after the improvement such as Fig. 3.
The middle part refractory materials thickens the path prolongation that the back crackle spreads inwards, thereby has delayed the possibility of the perforation and the fracture of rifle.
In addition big improvement has also been carried out in the elbow, change original hexagon into circle earlier, suitably compress the radius of left and right directions again, make it become ellipse, but must guarantee that the thickness of the refractory materials of short-axis direction is more than the 15mm, is controlled at 1.1～1.2 with oval-shaped major-minor axis ratio: 1, when molten iron acutely stirs, can reduce thrust and the resistance of molten iron, improve whole rifle force-bearing situation in use, reduce the appearance and the extension of crackle on the rifle rifle.The major-minor axis ratio of recommending is 1.15: 1.But in, the bottom refractory materials can not be too thick, otherwise the gross weight that can make whole spray gun is above 95 kilograms.
Two, the optimization design of refractory materials
Spray gun is to have good thermal shock resistance with the topmost characteristic of refractory materials, the erosion performance of good anti-molten iron scum also will be arranged in addition, and the mullite material has this characteristic.The spray gun refractory materials that is applied to the molten iron processing at present all is to use mullite to hang down cement deposit material, but each producer has adopted many ways and meanses in order to make this material have better anti-thermal shock stability:
The particle diameter of A, raising critical particle utilizes macrobead to stop the expansion of crackle.
B, utilize the difference of coefficient of thermal expansion between different material to produce tiny crack in use, utilize tiny crack toughness reinforcing.
C, strengthen the consumption of heat-resistant steel fiber, the one, utilize its high thermal conductivity to reduce the thermal stresses of material internal, the 2nd, utilize its high coefficient of thermal expansion to produce tiny crack and stop crack propagation, the 3rd, improve the globality of material, stop peeling off of material.
D, on steel core, take measures,, between steel core and anti-material, form the thermal expansion buffer layer to reduce the generation of refractory materials crackle as on steel core, being coated with one deck vaporization at high temperature thing.
Two of purpose of the present invention is to improve anti-thermal shock stability means on original basis, by in refractory materials, introducing the optimal design idea of the metal fine powder that accounts for refractory quality mark 0.5～10%, anti-thermal shock stability with further raising material, this metal fine powder has following characteristic: 1, fusing point is lower than the use temperature of spray gun, promptly be lower than 1400 ℃, in use, the metal fine powder fusion that is present in rifle body refractory materials inside forms a small amount of liquid phase, utilizes the toughness reinforcing mechanism of liquid phase plasticity to improve the thermal stresses of refractory materials; 2, use under the atmosphere at oxygen, nitrogen etc., the metal fine powder of rifle surface easily generates resistant to elevated temperatures oxide compound or oxynitride etc.; 3, also can be further with material in Al
2O
3Component reaction generates the more excellent high temperature phase of performance, and the compound high volume good stability that generates, and also helps the improvement of the thermal shock resistance of surperficial refractory materials.
But the metal fine powder add-on that fusing point is lower can not be too much, cannot join together in inside at material, otherwise the mechanical behavior under high temperature of material will descend rapidly under use temperature, so the addition of metal fine powder is must strict control less than 10wt%, and unable to get up effect very little.Preferential add-on of recommending is 5wt%.
On the basis of above-mentioned basic ideas, tested and added the influence of metal fine powder the refractory materials thermal shock resistance.Table 1 shows the test situation of thermal shock resistance when adding metal fine powder.The present invention is by to the improvement of rifle type structure, and introduces the spray gun that new refractory materials design concept makes and reach 6.42 stoves through the mean lifetime on probation of real stove, and the mean lifetime of producing apparently higher than prior art is lower than the life-span of 5 stoves.(seeing embodiment for details)
Description of drawings
The state during use of Fig. 1 molten iron pretreatment elbow spray gun.
The structure of the existing elbow spray gun of Fig. 2 (2-1) is sectional view, (2-2) is external form figure.
The spray gun structure of Fig. 3 texture improvement provided by the invention (3-1) is sectional view, (3-2) is external form figure, (3-3) is corresponding to (the schematic cross-section of A～E) shown in (3-2).
Embodiment
By the introduction of following embodiment, further to illustrate substantive distinguishing features of the present invention and obvious improvement.
Described according to Fig. 3, present embodiment is by the described improvement of making two aspects of summary of the invention, middle region at elbow spray gun, be that refractory materials is the thickest between the cross section of B shown in Figure 3 and D, and top the thinnest be 10mm, and in, the thickness ratio of bottom refractory materials is 1.20, and the cross section of bend pipe is oval, the ratio of oval major and minor axis is 1.15: 1, and the thickness of the refractory materials of short-axis direction is 16mm; On the other hand the composition of the refractory materials that uses is adjusted, increased metal fine powder in component, addition is 5wt%, and the fusing point of metal fine powder is lower than 1400 ℃ that is fusion in the use of hot metal pretreatment, forms liquid phase.
Concrete test method; After preparing sample according to the proportioning of table 1, the water that adds about 5% stirs, pour into the batten of 40mm * 40mm * 160mm, batten is after natural curing in 1 day, through 110 ℃ * 24h oven dry, the batten after the oven dry is divided into 4 groups, and wherein 3 groups more respectively through 1000 ℃ * 3h, 1300 ℃ * 3h, the burning till of 1400 ℃ * 3h, 4 groups of battens to crossing through treatment of different temperature respectively 1100 ℃ ← → condition of water-cooled under circular treatment 5 times, see the crackle situation and the residual strength of spline surfaces:
Table 1 experiment proportioning and thermal shock residual strength and surface crack situation
Above-mentioned two test examples are respectively made several spray guns with follow-on spray gun structure deliver to Baosteel and carry out real stove and try out, the life-span is respectively as table 2
Table 2 spray gun is in the actual use record of Baosteel
| Comparative example | Embodiment | Existing articles for use | |
| The stove number | 4，5，6，4 | 8，7，7，3，7，7，6 | |
| The average furnace number | 4.75 | 6.42 | 4 |
Claims (8)
1, a kind of through improved molten iron pretreatment elbow spray gun structure, the refractory materials and the steel pipe inner core that comprise outer wrap, the refractory thickness that it is characterized in that the spray gun outer wrap is improved to the top thinnest part by grading structure and keeps 10mm, and in, the thickness of the refractory materials of bottom adjusts to 1.15～1.25 than by 0.85; And the cross section of spray gun elbow changes ellipse into by hexagon.
2, described by claim 1 through improved molten iron pretreatment elbow spray gun structure, in it is characterized in that, the thickness ratio of the refractory materials of bottom is 1.20.
3, described through improved molten iron pretreatment elbow spray gun structure by claim 1, the ratio that it is characterized in that the major and minor axis of spray gun elbow elliptic cross-section is 1.1: 1～1.2: 1.
4,, it is characterized in that the refractory thickness 〉=15mm of the oval short-axis direction of spray gun elbow by claim 1 or 3 described through improved molten iron pretreatment elbow spray gun structure.
5,, it is characterized in that the ratio of major and minor axis of the elliptic cross-section of spray gun elbow is 1.15: 1 by claim 1 or 3 described through improved molten iron pretreatment elbow spray gun structure.
6, by the optimization design of each described refractory materials that uses through improved molten iron pretreatment elbow spray gun structure in the claim 1～3, it is characterized in that in existing refractory materials proportioning, introduce metal fine powder, it is 0.5%～10% that the metal fine powder of introducing accounts for refractory quality percentage ratio, and the metal fine powder fusing point of introducing is lower than 1400 ℃; Under oxygen or nitrogen atmosphere, the metal fine powder of rifle surface generates resistant to elevated temperatures oxide compound or oxynitride, and and Al
2O
3Component reaction generates the high temperature phase.
7, the refractory materials that uses by the described spray gun of claim 6 is characterized in that it is 5% that the metal fine powder of introducing accounts for properties of refractories percentage ratio.
8, the refractory materials that uses by the described spray gun of claim 6, the refractory quality percentage composition that it is characterized in that optimization design is: fused mullite 56%, andaluzite 18%, alumina powder 7%, mullite miropowder 4%, SiO 2 superfine powder 3%, aluminous cement 5%, steel fiber 2%, metal fine powder 5% adds 0.08% tripoly phosphate sodium STPP.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100346201A CN101260456A (en) | 2008-03-14 | 2008-03-14 | Modification of molten iron pretreatment pipe bend spray gun structure and optimization of refractory materials used for the same |
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|---|---|---|---|
| CNA2008100346201A CN101260456A (en) | 2008-03-14 | 2008-03-14 | Modification of molten iron pretreatment pipe bend spray gun structure and optimization of refractory materials used for the same |
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|---|---|---|---|
| CN 200910168551 Division CN101914657B (en) | 2008-03-14 | 2008-03-14 | Improvement of molten iron pretreatment elbow spray gun structure and optimization of used refractory material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786159A (en) * | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Slant-insert type molten iron pretreatment lance and manufacturing method thereof |
| CN101824509A (en) * | 2010-05-18 | 2010-09-08 | 上海彭浦特种耐火材料厂 | Improvement on spray gun core structure for molten iron pretreatment |
-
2008
- 2008-03-14 CN CNA2008100346201A patent/CN101260456A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786159A (en) * | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Slant-insert type molten iron pretreatment lance and manufacturing method thereof |
| CN101824509A (en) * | 2010-05-18 | 2010-09-08 | 上海彭浦特种耐火材料厂 | Improvement on spray gun core structure for molten iron pretreatment |
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Open date: 20080910 |