CN210163472U - Molten iron dephosphorization device - Google Patents
Molten iron dephosphorization device Download PDFInfo
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- CN210163472U CN210163472U CN201921011779.1U CN201921011779U CN210163472U CN 210163472 U CN210163472 U CN 210163472U CN 201921011779 U CN201921011779 U CN 201921011779U CN 210163472 U CN210163472 U CN 210163472U
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The utility model discloses a molten iron dephosphorization device belongs to steel smelting technical field. The utility model discloses a rifle body assembly and shower nozzle assembly, rifle body assembly constitute by rifle body inner tube, rifle body intermediate pipe, rifle body inlet tube and rifle body wet return, the shower nozzle assembly comprises shower nozzle body, shower nozzle wet return, shower nozzle inlet tube, shower nozzle intermediate pipe, shower nozzle inner tube upper end and rifle body inner tube intercommunication, shower nozzle intermediate pipe upper end and rifle body intermediate pipe intercommunication, the upper end and the rifle body inlet tube intercommunication of shower nozzle inlet tube, the upper end and the rifle body wet return intercommunication of shower nozzle wet return, the inner chamber of shower nozzle body is equipped with cooling water course, outer orifice and interior orifice. The utility model discloses have two sets of independent air feed channels, oxygen, nitrogen gas passageway and corresponding laval orifice promptly, can realize nitrogen, oxygen mixed blow under lower top oxygen suppliment intensity condition, improve converter molten bath upper portion dynamics condition, realize high-efficient, low consumption, environmental protection dephosphorization purpose.
Description
Technical Field
The utility model relates to a steel smelting technical field, more specifically say, relate to a molten iron dephosphorization device.
Background
Phosphorus is a harmful element in most steels, is easy to segregate in grain boundaries to cause low-temperature brittleness and temper brittleness, and is produced by dephosphorization of molten iron in order to meet the increase of the phosphorus content of raw materials and the market demand of extremely low phosphorus steel. The dephosphorization treatment of molten iron can be divided into two processes of oxidation dephosphorization and reduction dephosphorization, and at present, oxidation dephosphorization is generally adopted by various steel mills. The commonly used dephosphorization processes fall into two main categories: one method is to carry out dephosphorization in a hot metal ladle or a torpedo ladle, and the other method is to carry out dephosphorization treatment on the hot metal in a converter, and the two methods mainly have the following problems: when dephosphorization is carried out in a hot metal ladle or a torpedo ladle, the slag amount is large in the treatment process, the iron loss is high, the temperature drop is large, if oxygen blowing is adopted for temperature compensation, the splashing is serious, the treatment time is long, the pollution is serious, the smooth production is influenced, and the application condition is not ideal. When the molten iron is dephosphorized in advance in a converter, a converter two-step steelmaking process is generally adopted, namely one converter is used as a molten iron dephosphorizing furnace, and the other converter is used as a decarbonizing furnace. The molten iron dephosphorization furnace adopts a composite blowing mode, adopts a strong bottom blowing mode and a top lance weak oxygen supply mode to carry out dephosphorization operation, and has the defects of difficult melting of scrap steel on the upper part of a molten pool, long smelting time, large iron loss and relatively more deviation of a terminal point P from a balance value due to small oxygen supply flow of the top lance and poor dynamic conditions on the upper part of the molten pool of the converter.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The defect and not enough to prior art exist, the utility model provides a molten iron dephosphorization device, the utility model discloses have two sets of independent air feed channels, oxygen, nitrogen gas passageway and corresponding laval orifice promptly, can realize nitrogen, oxygen mixed blow under lower top oxygen suppliment intensity condition, improve converter molten bath upper portion kinetic condition, promote process carbon, temperature, phosphorus coordination, realize high efficiency, low consumption, environmental protection dephosphorization purpose.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses a molten iron dephosphorization device, including rifle body assembly and shower nozzle assembly, rifle body assembly by rifle body inner tube, rifle body intermediate pipe, rifle body inlet tube and rifle body wet return constitute, the outside of rifle body inner tube be provided with rifle body intermediate pipe, the outside of rifle body intermediate pipe is provided with rifle body inlet tube, the outside of rifle body inlet tube is provided with rifle body wet return, the lower part of rifle body assembly be connected with the shower nozzle assembly, the shower nozzle assembly comprises shower nozzle body, shower nozzle wet return, shower nozzle inlet tube, shower nozzle intermediate pipe, shower nozzle inner tube, the inner chamber of shower nozzle body is equipped with cooling water course, outer orifice, interior orifice;
the upper end of the nozzle inner tube is communicated with the gun body inner tube, the input end of the gun body inner tube is connected with nitrogen, the lower end of the nozzle inner tube is communicated with an inner spray hole of the nozzle body, the center of the nozzle inner tube is a nozzle central line, the outer side of the nozzle inner tube is provided with a nozzle middle tube, the upper end of the nozzle middle tube is communicated with the gun body middle tube, the input end of the gun body middle tube is connected with oxygen, the lower end of the nozzle middle tube is communicated with an outer spray hole of the nozzle body, the outer side of the nozzle middle tube is provided with a nozzle water inlet tube, the upper end of the nozzle water inlet tube is communicated with the gun body water inlet tube, the input end of the gun body water inlet tube is connected with an external cooling water inlet pipeline, the lower end of the nozzle water inlet tube is communicated with a cooling water channel of the nozzle body, the outer side of the, the lower end of the spray head water return pipe is communicated with a cooling water channel of the spray head body.
Furthermore, the gun body inner tube, the gun body intermediate tube, the gun body water inlet tube and the gun body water return tube are coaxial cylindrical tubes.
Furthermore, the center of the inner spray hole is an inner spray hole center line, and the included angle between the inner spray hole center line and the spray head center line is α -15 degrees.
Furthermore, the number of the inner spray holes is 2-6, the Mach number M2 of the outlet is 2.0-2.5, and the inner spray holes are distributed on the end face of the spray head body at intervals.
Furthermore, the number of the inner spray holes is one, the center line of the inner spray hole is overlapped with the center line of the spray head, and the outlet Mach number M2 is 2.0-2.5.
Furthermore, the number of the outer spray holes is 3-6, the Mach number M1 of the outlet is 1.2-2.2, and the outer spray holes are distributed on the surface of the spray head body at intervals.
Furthermore, the outer spray hole and the inner spray hole are both Laval spray holes and are composed of a conical contraction section, a near-cylindrical section and a conical expansion section, and the outer spray hole and the inner spray hole are respectively provided with an independent air supply channel.
Furthermore, the center of the outer spray hole is set as the center line of the outer spray hole, and the included angle between the center line of the outer spray hole and the center line of the spray head is β degrees to 20 degrees.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
the utility model discloses use the converter as reaction vessel, have two sets of independent air feed channels, oxygen promptly, nitrogen gas passageway and corresponding laval orifice, outer orifice is the toper with interior orifice, the blowout performance influence is showing, can realize nitrogen under lower top oxygen suppliment intensity condition, oxygen blows in mixture, improve converter molten bath upper portion dynamics condition, promote process carbon, temperature, phosphorus coordination, operating cost reduces in the dephosphorization process, the dephosphorization rate is showing and is improving, and effectively shorten steel smelting cycle, realize high efficiency, low consumption, the dephosphorization purpose of environmental protection.
Drawings
FIG. 1 is an overall structure diagram of the present invention;
FIG. 2 is a view of the gun assembly of the present invention;
fig. 3 is a structural view of the nozzle assembly of the present invention.
In the figure: 1. a gun body assembly; 11. an inner tube of the gun body; 12. a gun body middle tube; 13. a gun body water inlet pipe; 14. a gun body water return pipe; 2. a spray head assembly; 21. a nozzle body; 211. a cooling water channel; 212. spraying an outer orifice; 213. an inner spray hole; 22. a nozzle return pipe; 23. a nozzle water inlet pipe; 24. a nozzle intermediate pipe; 25. a nozzle inner tube; 26. a center line of the nozzle; 27. the center line of the inner spray hole; 28. the center line of the outer spray hole.
Detailed Description
The invention is further described with reference to the following figures and examples:
example 1
As can be seen from fig. 1-3, the molten iron dephosphorization apparatus of the embodiment includes a gun assembly 1 and a nozzle assembly 2, the gun assembly 1 is composed of a gun inner tube 11, a gun intermediate tube 12, a gun water inlet tube 13 and a gun water return tube 14, the gun inner tube 11, the gun intermediate tube 12, the gun water inlet tube 13 and the gun water return tube 14 are coaxial cylindrical tubes, the diameters of the gun inner tube 11, the gun intermediate tube 12, the gun water inlet tube 13 and the gun water return tube 14 are respectively denoted as Φ 4, Φ 3, Φ 2 and Φ 1, the gun intermediate tube 12 is disposed outside the gun inner tube 11, the gun water inlet tube 13 is disposed outside the gun intermediate tube 12, the gun water return tube 14 is disposed outside the gun water inlet tube 13, the nozzle assembly 2 is connected to the lower portion of the gun assembly 1, the nozzle assembly 2 is composed of a nozzle body 21, a nozzle water return tube 22, a nozzle water inlet tube 23, a nozzle intermediate tube 24 and a nozzle return tube 14, The inner tube 25 of the nozzle, the inner cavity of the nozzle body 21 is provided with a cooling water channel 211, an outer spray hole 212 and an inner spray hole 213.
The diameters of the nozzle return pipe 22, the nozzle inlet pipe 23, the nozzle intermediate pipe 24 and the nozzle inner pipe 25 are recorded as phi 5, phi 6, phi 7 and phi 8 respectively.
The upper end of the nozzle inner pipe 25 is communicated with the gun body inner pipe 11, the input end of the gun body inner pipe 11 is connected with nitrogen, the lower end of the nozzle inner pipe 25 is communicated with an inner spray hole 213 of the nozzle body 21, the center of the nozzle inner pipe 25 is a nozzle central line 26, the outer side of the nozzle inner pipe 25 is provided with a nozzle intermediate pipe 24, the upper end of the nozzle intermediate pipe 24 is communicated with the gun body intermediate pipe 12, the input end of the gun body intermediate pipe 12 is connected with oxygen, the lower end of the nozzle intermediate pipe 24 is communicated with an outer spray hole 212 of the nozzle body 21, the outer side of the nozzle intermediate pipe 24 is provided with a nozzle water inlet pipe 23, the upper end of the nozzle water inlet pipe 23 is communicated with the gun body water inlet pipe 13, the input end of the gun body water inlet pipe 13 is connected with an external cooling water inlet pipe, the lower end of the nozzle water inlet pipe 23 is communicated with a cooling, the upper end of the gun body water return pipe 14 is communicated with an external water return pipeline, and the lower end of the spray head water return pipe 22 is communicated with a cooling water channel 211 of the spray head body 21.
The center of the inner spray hole 213 is an inner spray hole center line 27, the included angle between the inner spray hole center line 27 and the nozzle center line 26 is α -15 °, when one inner spray hole 213 is provided, the inner spray hole center line 27 of the inner spray hole 213 coincides with the nozzle center line 26, the exit mach number M2 is 2.0-2.5, when 2-6 inner spray holes 213 are provided, the exit mach number M2 is 2.0-2.5, and the inner spray holes 213 are distributed at intervals on the end surface of the nozzle body 21.
The number of the outer spray holes 212 is 3 to 6, the Mach number M1 of the outlet is 1.2 to 2.2, the outer spray holes 212 are distributed on the surface of the spray head body 21 at intervals, the outer spray holes 212 and the inner spray holes 213 are both Laval type spray holes and are composed of a conical contraction section, a near cylindrical section and a conical expansion section, the outer spray holes 212 and the inner spray holes 213 are respectively provided with independent air supply channels, the center of the outer spray holes 212 is set to be an outer spray hole center line 28, and the included angle between the outer spray hole center line 28 and the spray head center line 26 is β to be 12-20 degrees.
The diameter of the conical expansion section of the outer injection hole 212 is recorded as phi 10, the diameter of the near cylindrical section of the outer injection hole 212 is recorded as phi 9, the diameter of the conical expansion section of the inner injection hole 213 is recorded as phi 12, and the diameter of the near cylindrical section of the inner injection hole 213 is recorded as phi 11.
The specific dephosphorization method comprises the following steps:
the method comprises the following steps: adding light and thin scrap steel into the converter, wherein the adding amount is determined according to the heat balance condition;
step two: adding molten iron into the converter, and determining the loading amount of the molten iron in the converter according to the nominal capacity of the converter;
step three: starting bottom blowing strong stirring;
step four: carrying out molten iron dephosphorization operation, inserting the gun body assembly 1 and the spray head assembly 2 into the converter, and carrying out oxygen supply and nitrogen supply operation on the spray head assembly 2 at a distance of 1.0-4.0 m from the molten iron liquid level in the converter;
step five: adding slag-making materials such as lime and the like for dephosphorization, wherein the adding amount of the lime is determined according to the condition of molten iron, R1.0-2.5 is controlled, R refers to alkalinity, and R is CaO/SiO2；
Step six: controlling the temperature of the converter to be below 1380 ℃, wherein the carbon content is not less than 3.5 percent, and if the temperature is too high or the carbon content is less than 3.5 percent; stopping oxygen supply operation of the outer hole, and only supplying nitrogen for stirring;
step seven: after the predetermined target is reached, the job is completed.
According to the actual operation situation, the specific implementation process is as follows:
the number of the outer spray holes 212 is 6, the Mach number of the outlet is M1 which is 2.05, the outer spray holes are uniformly distributed on the same circumference, the diameter phi 9 of the near cylindrical section (i.e. throat) is 28.33mm, the diameter phi 10 of the outlet of the conical expansion section is 37.59mm, and the process flow is 16000-25000M-3The included angle β between the central line 28 of the outer spray hole and the central line 26 of the spray head is 17.5 degrees, 1 inner spray hole 213 is arranged, the Mach number of the outlet is M2 2.20, the outer spray hole is arranged on the central line 26 of the spray head, the diameter phi 11 of the approximate cylindrical section (namely throat) of the outer spray hole is 53.46mm, the diameter phi 12 of the conical expansion section is 75.70mm, and the process flow rate is 13000-3H, the included angle a between the central line 27 of the inner spray hole and the central line 26 of the spray head is 0 degrees, the spray head body 21 is formed by copper casting, and the Cu content>99.85%, 406.4mm for Φ 1, 340mm for Φ 6, 267.4mm for Φ 3, 168mm for Φ 4, and 12mm for thickness.
The gun body inner tube 11, the nozzle inner tube 25 and the inner spray hole 213 are connected with nitrogen, the gun body intermediate tube 12, the nozzle intermediate tube 24 and the outer spray hole 212 are connected with oxygen, the gun body water inlet tube 13 is connected with an external cooling water inlet pipeline, and the gun body water inlet tube 23, the cooling water channel 211 of the nozzle body 21 and the nozzle water return tube 22 are connected with an external water return pipeline through the gun body water return tube 14.
The specific dephosphorization method comprises the following steps:
the first operation step: adding light and thin scrap steel into the converter, wherein the adding amount is 0-30t, the adding amount is determined according to molten iron silicon and temperature, and the actual adding amount is shown in the table;
and a second operation step: adding molten iron into the converter at a temperature of not less than 1200 ℃, wherein the adding amount is 290 tons and 330 tons;
the third operation step: the bottom blowing strong stirring is started, and the bottom blowing strength is 0.20m3T.min, stirring by adopting nitrogen;
the fourth operation step: when molten iron dephosphorization operation is carried out, the gun body assembly 1 and the spray gunThe head assembly 2 is inserted into the converter, and the distance between the nozzle assembly 2 and the molten iron liquid level gun position in the converter is as follows: 2.5m, carrying out oxygen supply and nitrogen supply operation; oxygen supply flow 24000m3Per hour, nitrogen supply flow rate 20000m3/h；
The operation step five: adding slag-forming materials such as lime and the like for dephosphorization; controlling the addition amount of lime to be 1.5, wherein the addition amount of the lime is shown in the following table;
the operation step six: the converter temperature is controlled below 1350 ℃ in the process, and the carbon content is not less than 3.8%;
the operation step seven: 3500-channel 4200m of accumulated oxygen supply3After that, the phosphorus reaches the target value (not more than 0.035%), the operation is completed.
The utility model discloses use the converter as reaction vessel, have two sets of independent air feed channels, oxygen, nitrogen gas passageway and corresponding laval orifice promptly, outer orifice 212 and interior orifice 213 are the toper, the blowout performance influence is showing, can realize nitrogen, oxygen mix and blow under lower top oxygen suppliment intensity condition, improve converter molten bath upper portion kinetic condition, operating cost reduces in the dephosphorization process, the dephosphorization rate is showing and is improving, and effectively shorten steel smelting cycle, realize high efficiency, low consumption, the dephosphorization purpose of environmental protection.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides a molten iron dephosphorization device, includes rifle body assembly (1) and shower nozzle assembly (2), its characterized in that: the spray gun comprises a gun body assembly (1), a spray gun body water inlet pipe (13), a gun body water return pipe (14), a gun body middle pipe (12), a gun body water inlet pipe (13) and a gun body water return pipe (14), wherein the gun body middle pipe (12) is arranged on the outer side of the gun body inner pipe (11), the gun body water inlet pipe (13) is arranged on the outer side of the gun body middle pipe (12), the gun body water return pipe (14) is arranged on the outer side of the gun body water inlet pipe (13), the lower portion of the gun body assembly (1) is connected with a spray head assembly (2), the spray head assembly (2) consists of a spray head body (21), a spray head water return pipe (22), a spray head water inlet pipe (23), a spray head middle pipe (24) and a spray head inner pipe (25), and a cooling water channel (211), an outer spray hole (212);
the upper end of the spray head inner pipe (25) is communicated with the gun body inner pipe (11), the input end of the gun body inner pipe (11) is connected with nitrogen, the lower end of the spray head inner pipe (25) is communicated with an inner spray hole (213) of the spray head body (21), the center of the spray head inner pipe (25) is a spray head central line (26), the outer side of the spray head inner pipe (25) is provided with a spray head middle pipe (24), the upper end of the spray head middle pipe (24) is communicated with the gun body middle pipe (12), the input end of the gun body middle pipe (12) is connected with oxygen, the lower end of the spray head middle pipe (24) is communicated with an outer spray hole (212) of the spray head body (21), the outer side of the spray head middle pipe (24) is provided with a spray head water inlet pipe (23), the upper end of the spray head water inlet pipe (23) is communicated with the gun body water inlet pipe (13), the input end of the gun body water inlet pipe (13) is connected with an, the outside of shower nozzle inlet tube (23) be provided with shower nozzle wet return (22), the upper end and the rifle body wet return (14) intercommunication of shower nozzle wet return (22), rifle body wet return (14) upper end intercommunication outside return line, the lower extreme of shower nozzle wet return (22) and cooling water course (211) intercommunication of shower nozzle body (21).
2. The dephosphorization apparatus for molten iron according to claim 1, wherein: the gun body inner tube (11), the gun body intermediate tube (12), the gun body water inlet tube (13) and the gun body water return tube (14) are coaxial cylindrical tubes.
3. The dephosphorizing apparatus for molten iron according to claim 1, wherein said inner nozzle hole (213) has a center line (27) at its center, and an angle between said center line (27) and said nozzle center line (26) is α ° to 15 °.
4. The dephosphorization apparatus for molten iron according to claim 1, wherein: the number of the inner spray holes (213) is 2-6, the outlet Mach number M2 is 2.0-2.5, and the inner spray holes (213) are distributed on the end face of the spray head body (21) at intervals.
5. The dephosphorization apparatus for molten iron according to claim 3, wherein: the number of the inner spray holes (213) is one, the inner spray hole center line (27) of each inner spray hole (213) is overlapped with the spray head center line (26), and the outlet Mach number M2 is 2.0-2.5.
6. The dephosphorization apparatus for molten iron according to claim 1, wherein: 3-6 outer spray orifices (212) are provided, the Mach number M1 of the outlet is 1.2-2.2, and the outer spray orifices (212) are distributed on the surface of the spray head body (21) at intervals.
7. The dephosphorization apparatus for molten iron according to claim 1, wherein: the outer spray hole (212) and the inner spray hole (213) are both Laval spray holes and are composed of a conical contraction section, a near-cylindrical section and a conical expansion section, and the outer spray hole (212) and the inner spray hole (213) are respectively provided with an independent air supply channel.
8. The dephosphorizing apparatus for molten iron of claim 1, wherein said outer nozzle hole (212) is centrally disposed as an outer nozzle hole centerline (28), and an angle between said outer nozzle hole centerline (28) and said nozzle tip centerline (26) is β ° to 20 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921011779.1U CN210163472U (en) | 2019-07-02 | 2019-07-02 | Molten iron dephosphorization device |
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| CN201921011779.1U CN210163472U (en) | 2019-07-02 | 2019-07-02 | Molten iron dephosphorization device |
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| CN210163472U true CN210163472U (en) | 2020-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218842A (en) * | 2019-07-02 | 2019-09-10 | 马鞍山钢铁股份有限公司 | A kind of dephosphorization of molten iron device and method |
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2019
- 2019-07-02 CN CN201921011779.1U patent/CN210163472U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218842A (en) * | 2019-07-02 | 2019-09-10 | 马鞍山钢铁股份有限公司 | A kind of dephosphorization of molten iron device and method |
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