CN110893458B - Composite multi-channel spray gun in hot-metal ladle and efficient air blowing and slag removing method thereof - Google Patents
Composite multi-channel spray gun in hot-metal ladle and efficient air blowing and slag removing method thereof Download PDFInfo
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- CN110893458B CN110893458B CN201811067264.3A CN201811067264A CN110893458B CN 110893458 B CN110893458 B CN 110893458B CN 201811067264 A CN201811067264 A CN 201811067264A CN 110893458 B CN110893458 B CN 110893458B
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- slag
- molten iron
- raking
- movement
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/005—Removing slag from a molten metal surface
- B22D43/007—Removing slag from a molten metal surface by using scrapers
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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
- C21C7/064—Dephosphorising; Desulfurising
Abstract
The invention discloses a composite multi-channel spray gun in a hot metal ladle and a high-efficiency air blowing and slag removing method thereof, which adopt a method for removing iron water slag by alternatively gathering slag and removing slag, namely, a high-efficiency low-cost method for continuously driving and gathering the molten iron slag at a slag removing opening by utilizing a composite channel air blowing and slag removing spray gun with variable flow and variable drift diameter so as to remove the iron water slag by a slag removing machine. According to the method, the three-dimensional slag-raking path of the slag-raking head is simplified into two-dimensional slag-raking path or four-dimensional slag-raking path into three-dimensional slag-raking path, so that the horizontal torsion angle of the slag-raking head is not required to be designed, the slag-raking efficiency can be effectively improved, the slag-raking time is greatly reduced, the cost is reduced, and the effect is improved.
Description
Technical Field
The invention relates to a molten iron pretreatment process in a steelmaking technology, in particular to a composite multi-channel spray gun in a molten iron tank and a high-efficiency air blowing and slag removing method thereof.
Background
The molten iron desulphurization and slagging-off process is an effective means for system sulfur control, can release the productivity of a blast furnace and a converter, eliminates the adverse effect of limited yield scale caused by insufficient supply of molten iron in the blast furnace, and is also an important reason for developing the desulphurization and slagging-off process in order to meet the requirement of the converter on high-quality molten iron, shorten smelting time, improve yield scale and realize scale benefit.
Most of slag raking systems in the existing molten iron pretreatment are completed by manually operated mechanical arms, the field working environment is quite severe, and the physical and psychological dangers to operators are large. In 2018, remote slag skimming is realized in the steel making industry, the problem of development of a KR (mechanical stirring desulfurization) automatic slag skimming technology is also solved, in addition, image recognition and processing technologies are introduced while the remote slag skimming technology is realized in a certain steel plant in the same row, and a manual-assisted semi-automatic slag skimming system is realized.
According to the report of the Chinese steel news network information (Chinese metallurgy report), the steel saddle starts from reasonably adjusting the time of the KR desulfurization slagging-off process while ensuring the desulfurization effect, so that the temperature reduction of molten iron is greatly reduced; and still smelt the resulfurization law through contrastive analysis KR desulfurization technology and the compound blowing desulfurization technology molten iron of calcium magnesium, formulated "KR desulfurization molten iron goes into stove sulphur definite value control" model, according to different smelting steel grades to low sulphur molten iron sulphur content requirement, the science sets up takes off the back sulphur, reduces the desulfurizer volume of going into, reaches the purpose that further reduces the desulfurization process cooling.
In some related prior patent applications, for example, CN 2797380Y discloses a method for blowing gas to remove slag, CN 102382922A discloses an apparatus and a method for blowing gas to remove slag, CN 104759613a discloses a slag tapping system of a hot metal ladle and a slag tapping method of the hot metal ladle, CN 205193472U discloses a system for detecting and controlling molten iron slag removal based on image processing, and CN 105160683a discloses a system and a method for detecting and controlling molten iron slag removal based on manual intervention. In addition, international related patents include JP09262661A and JPH0475768A (1992) and the like, korean patents KR1834958(B1), KR20020037179(2000), KR100682793B1(2006) and KR20110050197A (2011) and the like, and US patent US3883124A (2016) and the like.
Although the domestic and foreign patent applications are innovations and improvements on the molten iron slagging-off method, the domestic and foreign patent applications are all operated manually, and a full-automatic slagging-off technology is not completely realized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the composite multi-channel spray gun in the hot metal ladle and the efficient air blowing and slag removing method thereof, which can realize remote automatic slag removing and enhance the efficiency and reliability of the slag removing process through a dimension reduction design.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a composite multi-channel lance for use in a hot metal ladle comprises: the nozzle body, the cross-section setting of nozzle body is the arc to constitute by inner arc board and outer arc board, make this internal cavity of nozzle set up, form the air duct, all be equipped with the side spout that is the loudspeaker form on two tip of nozzle body, the opening angle of side spout is 20 ~ 160, be equipped with the central spout that is the loudspeaker form on the central axis of this internal arc board of nozzle, the opening angle of central spout is 20 ~ 160, the equipartition has the several to be the supplementary spout that the loudspeaker form on the inner arc board between two side spouts and the central spout, and the opening angle of supplementary spout is 40 ~ 70, the diameter of air duct is 29 ~ 31mm, the length of nozzle body is 1800 +/-2 m.
The inner diameter of the side nozzle is 25-35 mm, the inner diameter of the central nozzle is 10-20 mm, and the inner diameter of the auxiliary nozzle is 5-15 mm.
On the other hand, the method for efficiently blowing and removing the slag in the hot-metal ladle comprises the following steps:
1) carrying out dimensionality reduction setting on a slag-raking path of a slag-raking head on a slag-raking machine;
2) connecting the nozzle body with an external air source;
3) before slagging off, relevant parameters of the blowing and slag removing flow of the nozzle body are adjusted according to the slag amount of molten iron in each furnace;
4) starting an external air source, and blowing air into the nozzle body to remove slag, so that molten iron slag is gathered in the molten iron tank and is concentrated at a slag removing opening in the molten iron tank;
5) the mechanical arm of the slag removing machine is used for removing the molten iron slag along the central axis direction of the molten iron tank by using a slag removing head;
6) slag is gathered on the surface of the molten iron again, and the steps 3) to 5) are repeated and are circularly repeated;
7) and stopping slag driving and slag skimming until the slag skimming finishing condition is met, returning the molten iron tank and entering the next procedure.
The dimension reduction setting in the step 1) is specifically as follows:
reducing the three-dimensional forward and backward movement, up and down movement and horizontal torsion movement of the slag raking path into two-dimensional forward and backward movement and up and down movement;
or the four-dimensional movement of the slag raking path from back and forth movement, up and down tilting movement and horizontal twisting movement is reduced to three-dimensional movement of back and forth movement, up and down movement and up and down tilting movement.
The external gas source is inert gas or compressed air.
When the nozzle body is used for blowing gas and removing slag related parameters, a slag amount calculation model or manual experience is adopted for adjustment in a debugging stage; and when the slag is formally driven, the real-time parameter adjustment is automatically completed through a slag amount calculation model set in the debugging stage.
The slag amount calculation model is distinguished by an intelligent image identification method: firstly, acquiring an image in real time through a camera, then setting a proper threshold value to distinguish the boundaries of molten iron, slag and a molten iron tank, dynamically adjusting the flow rate of blowing and removing the slag according to the distribution of the real-time slag, then carrying out gray level and binarization processing on the image, and finally determining the approximate value of residual sulfur in the slag according to the gray level and the distribution area of the slag.
In the technical scheme, the composite multi-channel nozzle in the molten iron tank and the efficient blowing and slag removing method thereof provided by the invention utilize the variable-flow and variable-drift-diameter composite channel blowing and slag removing spray gun to continuously drive and gather the molten iron slag at the slag removing opening, so that the slag removing path of the slag removing head is simplified from three-dimensional or four-dimensional to two-dimensional or three-dimensional, the horizontal torsional motion angle of the slag removing head is not required to be set, and the slag removing head only needs to move back and forth and up and down, so that the slag removing efficiency can be effectively improved, the slag removing time is greatly reduced, the cost is reduced, the effect is increased, and the method is a method for removing the molten iron slag by slag accumulation and slag removal alternately.
Drawings
FIG. 1 is a schematic cross-sectional view of the composite multi-channel lance of the present invention;
FIG. 2 is a schematic diagram of the field layout of the air blowing and slag removing method of the invention;
FIG. 3 is an enlarged schematic view of position B of the field layout schematic of FIG. 2;
fig. 4 is a top view of the ladle in the field layout schematic of fig. 2.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1, the present invention provides a multi-channel lance for use in a hot metal ladle, including: nozzle body 100, nozzle body 100's cross-section setting is the arc to constitute by inner arc board 1 and outer arc board 2, make the interior cavity setting of nozzle body 100, form airway 3, all be equipped with a side spout 4 that is the loudspeaker form on two tip of nozzle body 100, the open angle of side spout 4 is 20 ~ 160, be equipped with a central spout 6 that is the loudspeaker form on the central axis 5 of nozzle body 100 inner arc board 1, the open angle of central spout 6 is 20 ~ 160, the equipartition has the supplementary spout 7 that the several is the loudspeaker form on the inner arc board 1 between two side spouts 4 and the central spout 5, and the open angle of supplementary spout 7 is 40 ~ 70, the diameter of airway 3 is 29 ~ 31mm, nozzle body 100's length is 1800 m.
Preferably, the inner diameter of the side nozzle 4 is 25-35 mm, the inner diameter of the central nozzle 6 is 10-20 mm, and the inner diameter of the auxiliary nozzle 7 is 5-15 mm, so that the nozzle body 100 is designed into a composite channel air blowing and slag removing nozzle with variable flow and variable path characteristics.
Referring to fig. 2 to 4, the invention further provides a method for efficiently blowing gas and removing slag in a hot-metal ladle, which comprises the following steps:
1) carrying out dimensionality reduction setting on a slag-raking path 10 of a slag-raking head 9 on a slag-raking machine 8;
2) connecting the nozzle body 100 with an external air source;
3) before slag removal, relevant parameters of the blowing flow rate of the nozzle body 100 are adjusted according to the quantity of 11 molten iron slag in each furnace;
4) starting an external gas source, blowing gas into the nozzle body 100 to remove slag, and enabling the molten iron slag 11 to accumulate slag in the molten iron tank 12 and concentrate at a slag removing opening in the molten iron tank 12 through the arc-shaped geometric structure of the nozzle body 100 and the pressure or flow of the slag removing gas;
5) a mechanical arm of the slag raking machine 8 rakes the molten iron slag 11 by using a slag raking head 9 along the direction of a central axis 13 of the molten iron tank 12;
6) slag is gathered on the surface of the molten iron again, and the steps 3) to 5) are repeated and are circularly repeated;
7) and stopping slag driving and slag skimming until the slag skimming finishing condition is met, returning the molten iron tank and entering the next procedure.
Preferably, the dimension reduction setting in step 1) specifically includes:
the three-dimensional movement of the slag raking path 10 from back-and-forth movement, up-and-down movement and horizontal twisting movement is reduced to two-dimensional movement of back-and-forth movement and up-and-down movement;
or the four-dimensional movement of the slag raking path 10, such as back-and-forth movement, up-and-down tilting movement and horizontal twisting movement, is reduced into three-dimensional movement of back-and-forth movement, up-and-down tilting movement and up-and-down tilting movement.
Preferably, the external gas source is a gas source such as inert gas or compressed air.
Preferably, when the nozzle body 100 blows the gas to catch up the relevant parameter of the slag flow, a slag quantity calculation model or manual experience is adopted for adjustment in the debugging stage; and when the slag is formally driven, the real-time parameter adjustment is automatically completed through a slag amount calculation model set in the debugging stage, so that the aim of continuously slagging in a reciprocating circulation manner after slagging is achieved. Because the molten iron slag 11 is continuously gathered near the central axis 13 of the molten iron tank 12, the function that other slag raking machines 8 need horizontal torsional movement is eliminated, the design of the slag raking machines 8 is simplified, the slag raking time is saved, and the method has very important practical significance.
Preferably, the slag amount calculation model is distinguished by an intelligent image identification method: firstly, acquiring an image in real time through a camera, then setting a proper threshold value to distinguish the boundaries of molten iron, molten iron slag 11 and a molten iron tank 12, dynamically adjusting the flow rate of blowing and removing the slag according to the distribution of the real-time slag, then carrying out gray level and binarization processing on the image, and finally determining an approximate value of residual sulfur in the slag (namely, judging an automatic slag removing end point) according to the gray level and the distribution area of the slag.
In addition, the air blowing and slag removing method can be combined with the prior immersed air blowing and slag removing gun 20 for use together, so that the air blowing and slag removing effect is enhanced. The application of the composite multi-channel spray gun and the air blowing and slag removing method is not limited to the molten iron pretreatment process, and can also be applied to other similar processes needing slag removing operation.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1. A high-efficiency air blowing and slag removing method for a variable flow and variable path composite multi-channel spray gun in a hot metal ladle comprises the following steps: nozzle body, its characterized in that: the cross section of the nozzle body is arc-shaped and consists of an inner arc plate and an outer arc plate, the nozzle body is internally hollow to form an air channel, two ends of the nozzle body are respectively provided with a horn-shaped side nozzle, the opening angle of each side nozzle is 20-160 degrees, the central axis of the inner arc plate of the nozzle body is provided with a horn-shaped central nozzle, the opening angle of the central nozzle is 20-160 degrees, a plurality of horn-shaped auxiliary nozzles are uniformly distributed on the inner arc plate between the two side nozzles and the central nozzle, the opening angle of each auxiliary nozzle is 40-70 degrees, the diameter of the air channel is 29-31 mm, and the length of the nozzle body is 1800 +/-2 m,
the efficient air blowing and slag removing method comprises the following steps:
1) carrying out dimensionality reduction setting on a slag-raking path of a slag-raking head on a slag-raking machine;
2) connecting the nozzle body with an external air source;
3) before slagging off, relevant parameters of the blowing and slag removing flow of the nozzle body are adjusted according to the slag amount of molten iron in each furnace;
4) starting an external air source, and blowing air into the nozzle body to remove slag, so that molten iron slag is gathered in the molten iron tank and is concentrated at a slag removing opening in the molten iron tank;
5) the mechanical arm of the slag removing machine is used for removing the molten iron slag along the central axis direction of the molten iron tank by using a slag removing head;
6) slag is gathered on the surface of the molten iron again, and the steps 3) to 5) are repeated and are circularly repeated;
7) stopping slag driving and slag skimming until the condition of slag skimming completion is met, returning the molten iron tank and entering the next procedure,
the related parameters of the blowing slag-removing flow of the nozzle body are adjusted by adopting a slag amount calculation model in a debugging stage; when the slag is formally driven, the real-time parameter adjustment is automatically completed through the slag amount calculation model set in the debugging stage,
the slag amount calculation model is distinguished by an intelligent image identification method: firstly, acquiring an image in real time through a camera, then setting a proper threshold value to distinguish the boundaries of molten iron, slag and a molten iron tank, dynamically adjusting the flow rate of blowing and removing the slag according to the distribution of the real-time slag, then carrying out gray level and binarization processing on the image, and finally determining the approximate value of residual sulfur in the slag according to the gray level and the distribution area of the slag.
2. The efficient air blowing and slag removing method as claimed in claim 1, characterized in that: the inner diameter of the side nozzle is 25-35 mm, the inner diameter of the central nozzle is 10-20 mm, and the inner diameter of the auxiliary nozzle is 5-15 mm.
3. The efficient air blowing and slag removing method as claimed in claim 1 or 2, which is characterized in that: the dimension reduction setting in the step 1) is specifically as follows:
reducing the three-dimensional forward and backward movement, up and down movement and horizontal torsion movement of the slag raking path into two-dimensional forward and backward movement and up and down movement;
or the four-dimensional movement of the slag raking path from back and forth movement, up and down tilting movement and horizontal twisting movement is reduced to three-dimensional movement of back and forth movement, up and down movement and up and down tilting movement.
4. The efficient air blowing and slag removing method as claimed in claim 1 or 2, which is characterized in that: the external gas source is inert gas or compressed air.
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| CN113467437B (en) * | 2020-03-31 | 2022-06-28 | 宝山钢铁股份有限公司 | Optimization method of KR automatic slag skimming intelligent path |
| CN112795727A (en) * | 2020-12-25 | 2021-05-14 | 鞍钢股份有限公司 | Three-dimensional positioning method for automatically slagging off desulfurized molten iron |
| CN113337674A (en) * | 2021-05-31 | 2021-09-03 | 攀钢集团攀枝花钢钒有限公司 | Air blowing slag removing gun and slag removing method |
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| EP1136157A1 (en) * | 2000-03-24 | 2001-09-26 | SMS Demag AG | Process and device for slag-free pouring of a molten metal from metallurgical vessels |
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