CN1233490C - Water gap without swirl - Google Patents
Water gap without swirl Download PDFInfo
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- CN1233490C CN1233490C CN 02139052 CN02139052A CN1233490C CN 1233490 C CN1233490 C CN 1233490C CN 02139052 CN02139052 CN 02139052 CN 02139052 A CN02139052 A CN 02139052A CN 1233490 C CN1233490 C CN 1233490C
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- mouth
- river
- cavity
- overhead gage
- internal baffle
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Abstract
The present invention discloses a water gap without a swirl, which relates to an outflow opening (steel tapping hole) of liquid steel in metallurgy industry. Inner baffles are added in a passage-shaped hollow chamber of a common water gap body, and upper baffles are added at the upper edge of the water gap. The inner baffles and the upper baffles are uniformly or non-uniformly distributed, and the number of the inner baffles is the same or not the same as that of the upper baffles. The technical scheme of the present invention is very simple, and obvious technical effects are obtained by only adding the upper baffles and the inner baffles. A vortex of the liquid steel is inhibited, a rolling slag quantity of the liquid steel is small, conditions are provided to refining the liquid steel, and the liquid steel quality is enhanced. The water gap of the present invention is suitable for moving liquid steel from one container to an outflow opening of another container by the gravitational effect. The present invention comprises a steel tapping hole of a converter, steely brick cups, an upper water gap, a tundish brick cup water gap, etc. The present invention is also suitable for a container water gap when non-ferrous metal is cast.
Description
Technical field
The present invention relates to a kind of flow export of liquid flow, being the metallurgy industry molten steel specifically transfers to the flow export (being tapping hole) of another container from a container, especially a kind ofly can suppress the tapping hole that steel flow goes out the vortex that produces in the process.The mouth of a river is that iron and steel enterprise is commonly called as a kind of of tapping hole.
Background technology
In modern steel mill, molten steel volume slag problem is a problem that is difficult to solve fully always.The tapping latter stage of molten steel from the converter to the ladle because the generation of vortex can be involved in molten steel with slag, also may be involved in air when serious, causes in the ladle quantity of slag big, and the molten steel rephosphorization, returns sulphur, reduces the recovery rate of alloy.In addition, molten steel is from ladle to tundish latter stage and the latter stage of molten steel from the tundish to the crystallizer, and slag is involved in molten steel, also can cause the molten steel field trash to increase, and influences steel quality.
Since 1970, the countries in the world metallargist addressed this problem trying every possible means.Generally adopt the mode of tapping pushing off the slag to reduce the quantity of slag down both at home and abroad, use refractory material skimming ball or the floating plug of density between molten steel and slag, make it stop up tapping hole latter stage, slag is stayed in the converter in tapping.The present pneumatic pushing off the slag method of promoting just at home is in tapping latter stage, blows to tapping hole is reverse with gases at high pressure, and slag can not be got off.In ladle, slag monitoring system under installing outside the mouth of a river when slag is sneaked into molten steel, because the mouth of a river is in time closed in the change of the signal of telecommunication, prevents to roll up slag.The weak point of these methods is, think that all the existence of vortex is inevitable, passively when the molten steel volume quantity of slag reaches certain proportion, stop tapping process, but at this moment there has been quite a few slag to enter next container, and had greatly steel also stay to obtain in the former container utilizing and be taken as steel scrap.According to design, be involved in molten steel in a large number for fear of slag, the large-scale steel mill that China iron and steel enterprise 1996 introduces generally will stay 1% molten steel, ladle to stay 0.5% in converter, and each waters residual 10 tons tundish, so through calculating, 1 year nearly 80,000 tons of molten steel has directly become steel scrap.And actual residual molten steel is greater than this number, and to contain the amount that large-scale field trash causes that the steel billet steel scrap in the steel just bigger because of the volume slag causes.
" Shanghai metal " the 4th phase in July, 1994 has been introduced the three holes tappings method of Kawasaki, Japan: tapping hole is set to be three that equilateral triangle distributes, and the energy that vortex takes place is cancelled each other and reaches the purpose of few slag.The shortcoming of this method is the selection that definite existence of distance between three holes is faced a difficult choice, can not be excessive, excessively then influence each other for a short time, and be not enough to offset vortex energy; Too small, then the intensity of the refractory material between three holes is difficult for reaching, so this method seldom is used.China's utility model patent 94207245.6 has been introduced the middle eddy current that contracts out head piece of continuous casting and has been suppressed baffle plate, it is characterized in that building the circular at tundish brick cup place by laying bricks or stones by 3-7 block length bar shaped refractory material, reduces the intensity of vortex with this.The weak point of this method is, because brick cup is tapering type or bell mostly, baffle plate is far from the vortex core, so the effect that plays is limited, it is reported does not have practical application now.
Summary of the invention
Above-mentioned deficiency at prior art, the purpose of this invention is to provide a kind of method and absence of vortices mouth of a river that suppresses mouth of a river vortex, this method and product can suppress the formation of mouth of a river vortex effectively, the following quantity of slag when reducing tapping, reduce the molten steel rephosphorization, return sulphur, improve yield of alloy,, improve steel quality for liquid steel refining provides good condition.
The object of the present invention is achieved like this: according to suppressing the method that mouth of a river vortex makes it to become the absence of vortices mouth of a river, the absence of vortices mouth of a river is the same with the common mouth of a river, there is a tunnel-shaped cavity at center, the mouth of a river, cavity be shaped as long tubular, reverse frustoconic and convergent shape, its special feature are that mouth of a river body is provided with Internal baffle and overhead gage.It is protruding upward and place according to the radiation direction to be arranged at the overhead gage of tunnel-shaped inner chamber upper edge, the overhead gage front end exceeds the upper edge and is positioned on the cavity, make them can stop the formation of top, mouth of a river vortex, the space that forms between the baffle plate is separated into micro cyclone with maelstrom, and its energy is cancelled out each other.The Internal baffle that is arranged in the tunnel-shaped inner chamber at the mouth of a river protrudes and extends to the passage lower edge to the center, adjacent screen and between them folded cavity inner wall form a semi-enclosed vortex region, inner chamber is divided into some sensible mutually sub-districts, when making steel flow cross the mouth of a river in vortex phase mutual interference that each sub-district produced, energy is cancelled out each other, thereby makes the whole mouth of a river become the absence of vortices mouth of a river.
The length that absence of vortices mouth of a river overhead gage protrudes to cavity center be channel cavity upper edge, mouth of a river radius 0.2-0.8 doubly, overhead gage height protruding upward be cavity lower edge radius 0.5-4 doubly, along the length of radiation direction be cavity upper edge radius 0.5-5 doubly; The Internal baffle width be each cross section radius on the cavity length direction 0.2-0.8 doubly, Internal baffle along the length of channel direction be 0.5 times of cavity lower edge radius to whole mouth of a river equal in length; The number of Internal baffle, overhead gage is 1 to 6.
The shape of cross section of the tunnel-shaped cavity of absence of vortices mouth of a river body is circle or polygon; The projection of Internal baffle is shaped as strip, the arc of strip wide at the top and narrow at the bottom, triangle, convergent shape or width unanimity; Overhead gage be shaped as rectangle, trapezoidal or class triangle.
Even or the uneven distribution of the Internal baffle at the absence of vortices mouth of a river and overhead gage, Internal baffle is identical or inequality with the number of overhead gage, the overlapping or not overlapping placement of Internal baffle and overhead gage.
Technical scheme of the present invention is very simple, has only increased several overhead gages and Internal baffle, has promptly obtained significant technique effect.1. suppress the vortex in the tapping process, make the molten steel volume quantity of slag few, required with alloy, furnace charge minimizing during refining, cost reduces.2. owing to suppress the tapping vortex, need not take slag into account and be involved in, can improve tap, reduce the steel scrap rate.3. tapping, the quantity of slag is few at present, avoids back the sulphur rephosphorization, and slag is involved in the molten steel few, has reduced the large-scale field trash in the steel; Because tangential velocity is little during the molten steel delivery port, reduced the amount of molten steel suction air, these have all improved the degree of purity of molten steel.Tangential velocity is little when 4. flowing out owing to molten steel, has alleviated the wearing and tearing to the mouth of a river, has improved the mouth of a river life-span.
Observe the following slag situation at the absence of vortices mouth of a river and the common mouth of a river by experiment.(the model size is 400 * 400 * 400mm), with the expanded perlite simulation slag of bubbling through the water column, water level 250-300mm with hydraulic model simulation ladle in the experiment.Experimental result is as follows:
The absence of vortices of the present invention mouth of a river is applicable to that molten steel transfers to the flow export of another container from a container by the gravity effect.It comprises the tapping hole of converter, the brick cup of ladle and filling pipe end, the brick cup of tundish, the mouth of a river etc.; The container mouth of a river when also being applicable to non-ferrous metals casting.
Description of drawings
Accompanying drawing 1 is that the absence of vortices mouth of a river is provided with the Internal baffle cross sectional representation;
Accompanying drawing 2 is that the absence of vortices mouth of a river is provided with the overhead gage cross sectional representation.
The longitudinal section schematic diagram also was an A-A position generalized section (not showing overhead gage among Fig. 1) among Fig. 1 when accompanying drawing 3 was the overlapping placement of absence of vortices mouth of a river overhead gage and Internal baffle;
Accompanying drawing the 4,5, the 6th, the mouth of a river vortex form and the schematic diagram that influences each other;
Accompanying drawing 7 is tapering type mouth of a river body cavity vertical sectional shape schematic diagrames.
Accompanying drawing acceptance of the bid keep the score state as follows: 1---mouth of a river body; 2---Internal baffle; 3---overhead gage; 4---road shape cavity.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.As shown in accompanying drawing 3, the absence of vortices mouth of a river is an integral body, for the convenience of narrating is divided into three parts with it---and mouth of a river body 1, Internal baffle 2 and overhead gage 3; The placement location of mouth of a river overhead gage 3 and mouth of a river Internal baffle 2 can be overlapping or not overlapping, and the situation when having selected them overlapped in Fig. 3 for illustrated convenience is represented.Fig. 1, Fig. 2 have shown the signal of Internal baffle and overhead gage position in the cross section of the mouth of a river respectively." the class triangle " of described overhead gage is a kind of shape more special trapezoidal (on the appearance difference of going to the bottom bigger, a side base angle is near the right angle, opposite side is an acute angle) in fact; The cross section of described Internal baffle can be the rectangle shown in the figure, also can be curved near the surface of internal cavity place, can form the analogous shape of the mutual intussusception of several circles when the angle of this arc is very big, the variation of these local shapes can not influence the function that the absence of vortices mouth of a river suppresses vortex.Fig. 4,5,6 has shown mouth of a river vortex form and has influenced each other; Its solid line circle expression mouth of a river, China and foreign countries inner chamber, inside solid circle expression center vortex, the short solid line between the two solid lines circle is represented the width of baffle plate, broken circle is represented the limit vortex.The reason that vortex produces be molten steel when entering the mouth of a river, exist great velocity gradient, thereby produce vortex up and down, so the spiral decline that overhead gage and Internal baffle can stop the molten steel particle is set in the porch.With baffle plate merotomized in the mouth of a river, the top of adjacent screen and their folded arcs are formed between a vortex region, can be referred to as the limit vortex; The top of all baffle plates is also formed between a vortex region, can be referred to as the center vortex.As shown in Figure 4, when the width of baffle plate hour (distance in promptly as figure between the two solid lines circle hour), the radius of limit vortex and center vortex is all bigger, crosses one another, and vortex can rotate to same direction, and the energy between the vortex is not cancelled each other.In fact, have only a center vortex this moment, only when not having baffle plate and the vortex diameter little.Shown in Figure 5, when baffle plate was wide, the limit vortex was little, and the center vortex is also little, does not disturb mutually between the vortex of limit, and vortex energy is offset very for a short time.In fact, only there is the limit vortex in middle absence of vortices.This example is because baffle plate is wide, and the molten steel flow resistance is big.The width that Figure 6 shows that baffle plate is about 1/2nd of mouth of a river radius, and at this moment, the limit vortex is the same with the center vortex big, also crosses one another, and the energy offset maximum in this case, can be accomplished absence of vortices basically.Fig. 7 is the shape signal of the convergent shape mouth of a river.
Claims (4)
1, a kind of method that suppresses mouth of a river vortex is characterized in that: Internal baffle (2) and overhead gage (3) are set on mouth of a river body (1); Overhead gage (3) is protruding upward to be arranged on tunnel-shaped inner chamber (4) upper edge according to the radiation direction, it is 1 to 6, its front end exceeds the upper edge and is positioned on the cavity (4), overhead gage (3) stops the formation of top, mouth of a river vortex, the space that forms between the baffle plate is separated into micro cyclone with maelstrom, and its energy is cancelled out each other; Internal baffle (2) is arranged in the tunnel-shaped inner chamber (4) at the mouth of a river, extend to the center protrusion and to the passage lower edge, it is 1 to 6, adjacent Internal baffle and between them folded cavity inner wall form a semi-enclosed vortex region, inner chamber is divided into some sensible mutually sub-districts, in the vortex phase mutual interference that each sub-district produced, energy is cancelled out each other when making steel flow cross the mouth of a river, thereby makes the whole mouth of a river become the absence of vortices mouth of a river.
2, a kind of absence of vortices mouth of a river, there is a tunnel-shaped cavity (4) at center, the mouth of a river, cavity (4) be shaped as long tubular, reverse frustoconic and convergent shape, upper edge, the mouth of a river is provided with overhead gage protruding upward, it is characterized in that: mouth of a river body (1) is provided with Internal baffle (2), and Internal baffle (2) and overhead gage (3) are in conjunction with as a whole; Described overhead gage (3) is arranged in upper edge, the mouth of a river along the radiation direction, and its front end exceeds the upper edge and is positioned on the cavity (4); Internal baffle (2) is arranged in the tunnel-shaped cavity (4), extends downwards to the cavity center protrusion and by the upper edge.
3, the absence of vortices according to claim 2 mouth of a river is characterized in that: the width that Internal baffle (2) protrudes to the center is 0.2～0.8 times of each cross section radius on mouth of a river channel cavity (4) length direction; Internal baffle (2) along the length of channel direction be 0.5 times of cavity (4) lower edge radius to whole mouth of a river equal in length; Overhead gage (3) height protruding upward is 0.5～4 times of cavity (4) lower edge radius, length along the radiation direction is 0.5～5 times of cavity (4) upper edge radius, and it exceeds the length of protruding to cavity center upper edge, the mouth of a river is 0.2～0.8 times of cavity upper edge radius.
4, the absence of vortices according to claim 2 mouth of a river is characterized in that: Internal baffle (2) and overhead gage (3) evenly or uneven distribution, Internal baffle (2) is identical or inequality with the number of overhead gage (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139052 CN1233490C (en) | 2002-09-13 | 2002-09-13 | Water gap without swirl |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139052 CN1233490C (en) | 2002-09-13 | 2002-09-13 | Water gap without swirl |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1481955A CN1481955A (en) | 2004-03-17 |
| CN1233490C true CN1233490C (en) | 2005-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02139052 Expired - Fee Related CN1233490C (en) | 2002-09-13 | 2002-09-13 | Water gap without swirl |
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| Country | Link |
|---|---|
| CN (1) | CN1233490C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3317034B1 (en) | 2015-07-02 | 2020-04-15 | Vesuvius U S A Corporation | Tundish outlet modifier |
| GB201620100D0 (en) * | 2016-04-12 | 2017-01-11 | Mills Stephen D | Refractory nozzle |
| CN106282482A (en) * | 2016-11-18 | 2017-01-04 | 马鞍山钢铁股份有限公司 | A kind of molten steel export structure |
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2002
- 2002-09-13 CN CN 02139052 patent/CN1233490C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1481955A (en) | 2004-03-17 |
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