Oxygen lance nozzle for 120-ton vanadium extraction converter and vanadium extraction converter

Abstract

The utility model relates to the technical field of converter steelmaking, and discloses an oxygen lance nozzle for a 120-ton vanadium extraction converter and the vanadium extraction converter. The oxygen lance nozzle comprises a lance body, wherein a cavity is formed in the lance body; the spraying hole is in a Venturi tube shape, is formed in the front portion of the gun body and is used for spraying oxygen, and the narrow portion in the middle of the spraying hole is a throat portion. The oxygen lance nozzle increases the oxygen flow, so that the pure oxygen blowing time is shortened under the same oxygen pressure, the smelting time of a vanadium extraction converter is shortened, and the production efficiency of the vanadium extraction converter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of converter steelmaking, and in particular to an oxygen lance nozzle for a 120-ton vanadium extraction converter and a vanadium extraction converter. BACKGROUND

[0002] 339 oxygen lances are widely used in 120-ton vanadium extraction converters. The oxygen lances are applied to 120-ton converters, have 3 holes, a throat diameter of 39 mm, an outlet diameter of 50 mm, and an outlet Mach number of 1.86Ma. The oxygen blowing pressure is 0.75 MPa, the oxygen flow is 17500 m 3 / h, and the average pure oxygen blowing time per furnace is 325 s. The oxygen lances are used for small carbon burn-off, low residual vanadium in semi-steel, and high vanadium pentoxide content in vanadium slag, and therefore the 339 oxygen lances are widely used.

[0003] However, the current 339 oxygen lances have a long oxygen blowing time, which leads to low production efficiency of the vanadium extraction converter.

[0004] Therefore, there is an urgent need for an oxygen lance nozzle for a 120-ton vanadium extraction converter to solve the technical problem of a long oxygen blowing time. SUMMARY

[0005] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor is it intended to determine key / important components or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0006] In view of the deficiencies of the prior art, the present application provides an oxygen lance nozzle for a 120-ton vanadium extraction converter and a vanadium extraction converter.

[0007] In a first aspect, the present application provides an oxygen lance nozzle for a 120-ton vanadium extraction converter, comprising: a lance body, a cavity being formed in the lance body; a spray hole, the spray hole being in the shape of a Venturi tube, being formed in the front of the lance body, and being used for spraying oxygen, wherein the middle narrow part of the spray hole is a throat part.

[0008] In the technical solution of the oxygen lance nozzle for a 120-ton vanadium extraction converter, the lance body comprises: an outer tube, an oxygen tube, and a middle layer tube between the outer tube and the oxygen tube.

[0009] In the technical solution of the oxygen lance nozzle for a 120-ton vanadium extraction converter, the size of the outer tube is φ219x9mm, the size of the oxygen tube is φ133x6mm, and the size of the middle layer tube is φ180x7mm.

[0010] In the technical solution of the oxygen lance nozzle for a 120-ton vanadium extraction converter, the diameter of the throat part is 40-44mm.

[0011] In the technical scheme of the oxygen lance nozzle for the 120-ton vanadium extraction converter, the throat portion has a diameter of 41 mm.

[0012] In the technical scheme of the oxygen lance nozzle for the 120-ton vanadium extraction converter, the outlet of the injection hole has a diameter of 42-54 mm.

[0013] In the technical scheme of the oxygen lance nozzle for the 120-ton vanadium extraction converter, the outlet of the injection hole has a diameter of 53.3 mm.

[0014] In the technical scheme of the oxygen lance nozzle for the 120-ton vanadium extraction converter, the oxygen pressure is 0.75 MPa, and the oxygen flow rate is 19500 m 3 / h.

[0015] In the technical scheme of the oxygen lance nozzle for the 120-ton vanadium extraction converter, the number of the injection holes is three, and the included angle between the center line of each injection hole and the center line of the oxygen pipe is 8°-16°.

[0016] In a second aspect, the embodiments of the present disclosure provide a vanadium extraction converter comprising the aforementioned oxygen lance nozzle.

[0017] The oxygen lance nozzle for the 120-ton vanadium extraction converter and the vanadium extraction converter provided by the embodiments of the present disclosure can achieve the following technical effects:

[0018] The oxygen lance nozzle for the 120-ton vanadium extraction converter provided by the present application has an injection hole in the shape of a Venturi tube, which is arranged at the front of the lance body and used for spraying oxygen, wherein the middle narrow portion of the injection hole is a throat portion. The three injection holes are uniformly distributed at the lance head, the injection hole included angle is 10°, the throat diameter is 41 mm, the outlet diameter is 53.3 mm, the outlet Mach number is 1.95, and the design oxygen pressure is 0.75 MPa.

[0019] Due to the increase in the oxygen flow rate, the pure oxygen blowing time is shortened by 25 s under the same oxygen pressure, for example, 0.75 MPa, thereby shortening the smelting time of the vanadium extraction converter and improving the production efficiency of the vanadium extraction converter. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like numerals refer to like elements throughout the drawings, the drawings are not intended to be to scale and in which:

[0021] Figure 1 A cross-sectional view of the oxygen lance nozzle for the 120-ton vanadium extraction converter and the vanadium extraction converter is shown.

[0022] In the drawings:

[0023] 1 - barrel; 11 - cavity; 12 - outer tube; 13 - oxygen tube; 14 - middle tube;

[0024] 2 - injection hole; 21 - throat portion. DETAILED DESCRIPTION

[0025] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings, which are for reference only and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0026] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged as appropriate in order to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0027] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0028] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0029] Unless otherwise specified, the term "a plurality of" means two or more.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0031] Vanadium-containing molten iron from blast furnaces, after desulfurization, enters a converter for vanadium extraction. Vanadium (V) is a transition metal element and an extremely important industrial raw material. Due to its excellent strength, hardness, and fatigue resistance, it is widely used in the iron, chemical, aerospace, electronics, biological, and agricultural fields. Vanadium is widely distributed in nature, accounting for approximately 0.02% of the Earth's crust by mass; however, its distribution is extremely dispersed, mainly occurring as an associated mineral with vanadium sulfate, lead-vanadium, vanadium marble, uranium vanadate, and vanadium-titanium magnetite. During the mining and processing of these ores, vanadium is recovered as a co-product or byproduct. Vanadium-titanium magnetite is the main mineral resource of vanadium, which is associated with iron and titanium. Generally, it is smelted into molten iron and then oxidized and blown to obtain vanadium slag, which is the main raw material for producing vanadium products. The process of producing vanadium slag is called vanadium extraction.

[0032] Currently, the main vanadium extraction processes include atomization vanadium extraction, sodium vanadium extraction, bottom-blown air vanadium extraction, side-blown air vanadium extraction, top-blown oxygen vanadium extraction, and top-bottom combined blowing vanadium extraction. Each has its own characteristics, but all suffer from drawbacks such as a long extraction cycle, high iron content in vanadium slag, and low vanadium oxidation rate, which to some extent affect the yield and quality of vanadium slag. To improve these processes, a side-blowing device is added to the top-bottom combined blowing converter vanadium extraction process. This side-blowing device involves installing side-blowing bricks in the converter lining during converter repair. Gas is supplied to the molten pool through the side-blowing bricks, and inert gas is blown into the molten pool through a combination of top, bottom, and side blowing to achieve thorough stirring of the molten pool, improve the kinetics of the molten pool reaction, reduce residual vanadium in the semi-steel, increase residual carbon in the semi-steel, reduce the carbon content in the vanadium slag, and improve the grade of the vanadium slag, thus achieving the goal of vanadium removal and carbon retention.

[0033] One of the key components of a vanadium-extraction converter is the oxygen lance nozzle. The oxygen lance is a tubular device that blows high-pressure, high-purity oxygen at supersonic speeds above the molten metal pool inside the converter, and it is equipped with a high-pressure water cooling protection system. It is also called a spray gun. It is an important piece of equipment in oxygen top-blown steelmaking.

[0034] The structure and performance of the oxygen lance largely determine the effectiveness of oxygen steelmaking. Especially in top-blown oxygen converter steelmaking, the oxygen lance plays a dominant role. It controls crucial process factors such as the contact area between the oxygen jet and the molten pool, the penetration depth of the oxygen jet, the stirring state of the molten pool, the degree of oxidation of elements, the heating rate of the molten pool, and the iron oxide content in the slag. Therefore, it plays a vital role in slag formation, splashing, impurity removal, converter steelmaking endpoint control, and various technical and economic indicators of steelmaking. The oxygen lance consists of three parts: the nozzle, the lance body, and the lance tail. The nozzle, made of industrial pure copper, is the most important part of the oxygen lance.

[0035] Figure 1The utility model discloses a kind of oxygen lance nozzle and the cross section schematic diagram of vanadium extraction converter for 120 tons for the utility model discloses a kind of oxygen lance nozzle and the cross section schematic diagram of vanadium extraction converter for 120 tons.

[0036] As Figure 1 Indicated, first aspect, the embodiment of the present disclosure provides a kind of oxygen lance nozzle for 120 tons of vanadium extraction converter, comprising: lance body 1 and spray hole 2, the cavity 11 is opened in the lance body 1;The spray hole 2 is venturi tube shape, is opened in the front of lance body 1, for spraying oxygen, wherein, the middle narrow part of the spray hole 2 is throat portion 21.

[0037] Specifically, in the field of steel metallurgy, vanadium extraction converter is often used.This paper is preferably used for 120 tons of vanadium extraction converter.The vanadium extraction converter includes oxygen lance nozzle.Spray hole 2 is opened in the cavity 11 in lance body 1.The spray hole 2 is long strip shape, its shape is venturi tube shape, or similar shape of wide front and back and narrow middle, the middle narrow part is also called throat portion 21.This design can improve the injection speed of oxygen, improve oxygen flow.

[0038] In a preferred embodiment of the utility model, lance body 1 includes: outer tube 12, oxygen tube 13 and middle layer pipe 14 between outer tube 12 and oxygen tube 13.

[0039] Specifically, lance body 1 is composed of three pipe segments of outer tube 12, oxygen tube 13 and middle layer pipe 14.The width and length of three pipe segments can be different or same.Among them, lance body 1 can adopt injection molding.

[0040] In a preferred embodiment of the utility model, the size of outer tube is φ219 × 9mm, the size of oxygen tube is φ133 × 6mm, and the size of middle layer pipe is φ180 × 7mm.

[0041] Specifically, the size of lance body 1 of oxygen lance adopted in the present application can meet the requirements of oxygen lance nozzle.Optimally, the size described above is adopted, and the length of lance body 1 is 340mm, and the length of nozzle part of lance body 1 is 225mm.The included angle of spray hole 2 is 10 °, the throat diameter of spray hole 2 is 41mm, and the outlet diameter is 53.3mm, and all have tolerance.This can improve the stability of lance body 1.

[0042] In a preferred embodiment of the utility model, the diameter of throat portion 21 is 40-44mm.The diameter of throat portion is preferably 41mm.The diameter at the outlet of spray hole is 42-54mm.The diameter at the outlet of spray hole is 53.3mm.The pressure of oxygen is 0.75MPa, and the flow of oxygen is 19500m 3 / h.The number of spray holes is 3, and the included angle between the center line of each spray hole and the center line of oxygen tube is 8 °-16 °.

[0043] Specifically, in the existing conventional oxygen lance, the throat diameter of the nozzle is generally less than 40 mm, for example, 39 mm is adopted, and the diameter of the outlet of the injection hole is 50 mm. The number of the injection holes is 3, and the injection hole angle is preferably 10°. The diameter of the throat portion 21 and the diameter of the outlet of the injection hole are both increased. For example, the diameter of the throat portion 21 is 41 mm, and the diameter of the outlet of the injection hole is 53.3 mm. This increases the oxygen flow (from the original 17500 m 3 / h to 19500 m 3 / h), shortens the oxygen blowing time of the vanadium extraction converter (30 s), shortens the smelting time of the vanadium extraction converter, improves the production efficiency of the vanadium extraction converter, and reduces the production cost.

[0044] In a preferred embodiment, the 339 oxygen lance is widely used in a 120-ton vanadium extraction converter, which is applied to a 120-ton converter, 3 holes, the throat diameter of the nozzle is 39 mm, the outlet diameter is 50 mm, the injection hole angle is 10°, and the outlet Mach number is 1.86Ma. The oxygen blowing pressure is 0.75 MPa, the oxygen flow is 17500 m 3 / h, and the average oxygen blowing time per furnace is 325 s. The oxygen lance is used for small carbon burn-off, low residual vanadium in semi-steel, and high vanadium pentoxide content in vanadium slag, so the 339 oxygen lance is widely used.

[0045] With the increase of the amount of molten iron for vanadium extraction, especially during the maintenance of the vanadium extraction furnace, the contradiction of insufficient production capacity of the vanadium extraction converter is prominent, and it is necessary to speed up the vanadium extraction speed and reduce the vanadium extraction process time. The 341 oxygen lance for the converter is proposed, which retains the hole type and angle of the 339 oxygen lance, and expands the throat diameter and outlet diameter. The parameters of the oxygen lance are as follows: the number of holes is 3, the throat diameter is 41 mm, the outlet diameter is 53.3 mm, the injection hole angle is 10°, and the outlet Mach number is 1.86Ma. The oxygen blowing pressure is 0.75 MPa, and the oxygen flow is 19500 m 3 / h. The new 341 oxygen lance for vanadium extraction inherits the advantages of small carbon burn-off, low residual vanadium in semi-steel, and high vanadium pentoxide content in vanadium slag. The oxygen blowing time per furnace is shortened by 25 seconds, from the original 325 s to 300 s, which shortens the vanadium extraction process time and improves the vanadium extraction treatment capacity.

[0046] In a second aspect, the embodiments of the present disclosure also provide a vanadium extraction converter comprising the aforementioned oxygen lance nozzle.

[0047] Specifically, the vanadium extraction converter has all the features of the oxygen lance nozzle, and also has the corresponding effects of shortening the smelting time of the vanadium extraction converter and improving the production efficiency of the vanadium extraction converter.

[0048] The above description and drawings suffice to fully enable one skilled in the art to practice the embodiments of the present disclosure. Other embodiments can include structural and other changes. The embodiments are merely representative of possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included in, or substituted for, portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and can be varied in a variety of ways. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. An oxygen lance nozzle for a 120-ton vanadium extraction converter, characterized in that, include: The gun body has a cavity inside; The nozzle, which is shaped like a venturi tube, is located at the front of the gun body and is used to spray oxygen. The narrow middle part of the nozzle is the throat.

2. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 1, characterized in that, The gun body includes: an outer tube, an oxygen tube, and an intermediate tube located between the outer tube and the oxygen tube.

3. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 2, characterized in that, The outer tube has dimensions of φ219×9mm, the oxygen tube has dimensions of φ133×6mm, and the middle tube has dimensions of φ180×7mm.

4. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 1, characterized in that, The diameter of the throat opening is 40-44 mm.

5. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 4, characterized in that, The diameter of the throat opening is 41 mm.

6. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 5, characterized in that, The diameter of the nozzle outlet is 42-54 mm.

7. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 6, characterized in that, The diameter of the nozzle outlet is 53.3 mm.

8. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to claim 7, characterized in that, The oxygen pressure is 0.75 MPa, and the oxygen flow rate is 19500 m³ / h. 3 / h.

9. The oxygen lance nozzle for a 120-ton vanadium extraction converter according to any one of claims 1 to 8, characterized in that, The number of nozzles is 3, and the angle between the centerline of each nozzle and the centerline of the oxygen pipe is 8°-16°.

10. A vanadium extraction converter, characterized in that, include: The oxygen lance nozzle according to any one of claims 1-9.

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