Gas mixing device for steelmaking bottom blowing of induction furnace

Abstract

The utility model provides a gas mixing device for induction furnace steelmaking bottom blowing, which comprises a primary mixing chamber, a gas mixing impeller, a gas mixing pipe, a final mixing chamber and a mixed gas outlet, the primary mixing chamber is connected with a gas inlet pipe A and a gas inlet pipe B, and different gases respectively enter the gas inlet pipe A and the gas inlet pipe B; the gas mixing impeller is driven by a motor to rotate to stir mixed gas, the gas mixing pipe is connected behind the gas mixing impeller, the gas enters the final mixing chamber after passing through the gas mixing pipe, and the final mixing chamber is connected with the gas mixing pipe and then connected with the mixed gas outlet. According to the utility model, the problem that the bottom blowing of the induction furnace does not have a gas mixing function is solved, N2, Ar and CO2 serving as gas sources are mixed pairwise, the two gases are ensured to be fully and uniformly mixed, the reaction and stirring effects of all parts of a molten pool are consistent, and the purposes of reducing CO2 emission, reducing cost and improving production efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of metallurgy and steelmaking, and in particular to a gas mixing device for bottom blowing in induction furnace steelmaking. Background Art

[0002] The composite blowing method is developed on the basis of bottom blowing and top blowing. It uses the bottom blowing airflow to overcome the weakness of the top blowing oxygen flow in insufficient stirring capacity of the smelting pool, especially when the carbon content is low. It can make the reaction in the furnace close to equilibrium and reduce iron loss. At the same time, it retains the characteristic of the top blowing method that it is easy to control the slag-making process. Therefore, it has better technical and economic indicators than single top blowing or bottom blowing.

[0003] There are many different types of combined bottom blowing gas sources, with N2 and Ar being the most commonly used. N2 is easy to produce and inexpensive. When used for stirring, it eliminates the need for a cooling medium to protect the gas supply components. Improper use can increase [N] in the molten steel, thus affecting its quality. Ar is the most ideal stirring gas, ensuring effective stirring without increasing the risk of harmful gases in the steel. However, due to its high cost and limited availability, it is mostly used for final blowing stirring to purify the molten steel.

[0004] With the current demand for green emission reduction, a large number of steel companies are using CO2 as a bottom-blowing gas. One volume of CO2 entering the molten steel reacts with the carbon in the steel to produce two volumes of CO. This significantly improves the stirring effect of the bottom-blowing process, is cost-effective, and does not increase the amount of harmful components in the steel. In actual production, it is also necessary to mix N2, Ar, and CO2 in pairs. To ensure consistent reaction and stirring throughout the molten pool, reduce compositional deviations in the final product, and improve product quality, these gases must be thoroughly mixed.

[0005] Most gas mixing devices are designed for large converters, while there are fewer bottom-blowing gas mixing devices for small induction furnaces, and small induction furnace steelmaking has higher requirements for emission reduction. Summary of the Invention

[0006] In response to the aforementioned problem of the lack of gas mixing in induction furnace bottom blowing during production operations, a gas mixing device for induction furnace steelmaking bottom blowing is provided. This device mixes N2, Ar, and CO2 gas sources in pairs, ensuring a fully uniform mixture of the two gases and consistent reaction and stirring effects throughout the molten pool, thereby reducing CO2 emissions, lowering costs, and improving production efficiency.

[0007] The technical means adopted by this utility model are as follows:

[0008] A gas mixing device for bottom blowing in induction furnace steelmaking, comprising: a primary mixing chamber, a gas mixing impeller, a gas mixing pipe, a final mixing chamber, and a mixed gas outlet;

[0009] The primary mixing chamber is connected to an air inlet pipe A and an air inlet pipe B, into which different gases enter respectively; the mixing impeller is driven by a motor to rotate and stir the mixed gas, and is subsequently connected to the mixing pipe. After passing through the mixing pipe, the gas enters the final mixing chamber, and the final mixing chamber is connected to the mixing pipe, and subsequently connected to the mixed gas outlet.

[0010] Furthermore, the gas with a smaller volume ratio enters through the intake pipe A, and the gas with a larger volume ratio enters through the intake pipe B.

[0011] Furthermore, a porous air-permeable plate with a pore size of no more than 5 nanometers is arranged inside the mixing tube, in which the mixed gas collides and breaks up, and recombine to achieve complete and uniform mixing.

[0012] Furthermore, a gas composition analyzer is provided in the final mixing chamber to ensure that the gas volume ratio is correct and the pressure meets the use conditions.

[0013] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following advantages:

[0014] 1. The utility model provides a gas mixing device for bottom blowing of induction furnace steelmaking, which has a simple design and is easy to use. It is aimed at the commonly used gases for bottom blowing of induction furnace steelmaking, N2, Ar and CO2, and can achieve uniform mixing of gases without complicated structure.

[0015] 2. The utility model provides a gas mixing device for bottom blowing in induction furnace steelmaking. Compared with traditional gas mixing devices, the gas mixing effect is good and the internal air pressure stability of the device is good. A porous air-permeable plate with a hole size of no more than 5 nanometers is arranged in the mixing pipe to ensure that the gas molecules collide fully in the mixing pipe; the design of the final mixing chamber is added to ensure that the mixed gas is mixed evenly and the air pressure and composition are stabilized in the final mixing chamber before being output from the gas outlet.

[0016] Based on the above reasons, the utility model can be widely promoted in the field of metallurgy and steelmaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 The utility model is a front view of a gas mixing device for bottom blowing in an induction furnace for steelmaking.

[0019] In the figure: 1. Primary mixing chamber; 2. Mixing impeller; 3. Mixing pipe; 4. Final mixing chamber; 5. Mixed gas outlet. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0024] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0027] like Figure 1 As shown, the utility model provides a gas mixing device for bottom blowing in induction furnace steelmaking, comprising: a primary mixing chamber 1, a gas mixing impeller 2, a gas mixing pipe 3, a final mixing chamber 4, and a mixed gas outlet 5;

[0028] The primary mixing chamber 1 is connected to an air inlet pipe A and an air inlet pipe B, into which different gases enter respectively; the mixing impeller 2 is driven by a motor to rotate and stir the mixed gas, and is subsequently connected to the mixing pipe 3. After passing through the mixing pipe 3, the gas enters the final mixing chamber 4. The final mixing chamber 4 is connected to the mixing pipe 3 and then connected to the mixed gas outlet 5.

[0029] Furthermore, the two gases enter the primary mixing chamber 1 from the air inlet pipes A and B respectively, of which the larger gas enters from the air inlet pipe B, and enters the mixing impeller 2 device after passing through the primary mixing chamber 1, which contains an electric mixing impeller 2 that can actively stir the mixed gas and adjust the gas flow rate; the mixed gas enters the mixing pipe 3, and a porous breathable plate with a pore size of no more than 5 nanometers is arranged in the mixing pipe 3 to ensure that the gas molecules fully collide and are completely mixed in the mixing pipe 3; after entering the final mixing chamber 4, the composition is measured by the gas composition meter to ensure that the pressure of the mixed gas is between 1.0 and 5.0 MPa, and finally output from the mixed gas outlet 5.

[0030] Furthermore, the gas with a smaller volume ratio enters through the intake pipe A, and the gas with a larger volume ratio enters through the intake pipe B.

[0031] Furthermore, a porous gas-permeable plate with a pore size of no more than 5 nanometers is arranged inside the mixing tube 3, in which the mixed gas collides and breaks up, and recombine to achieve complete and uniform mixing.

[0032] Furthermore, a gas composition analyzer is provided in the final mixing chamber 4 to ensure that the gas volume ratio is correct and the pressure meets the use conditions.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas mixing device for bottom blowing in induction furnace steelmaking, characterized in that: include: Primary mixing chamber, mixing impeller, mixing pipe, final mixing chamber, mixed gas outlet; The primary mixing chamber is connected to an air inlet pipe A and an air inlet pipe B, into which different gases enter respectively; the mixing impeller is driven by a motor to rotate and stir the mixed gas, and is subsequently connected to the mixing pipe. After passing through the mixing pipe, the gas enters the final mixing chamber, and the final mixing chamber is connected to the mixing pipe, and subsequently connected to the mixed gas outlet.

2. The gas mixing device for bottom blowing in induction furnace steelmaking according to claim 1, characterized in that: The gas with a smaller volume ratio enters through the intake pipe A, and the gas with a larger volume ratio enters through the intake pipe B.

3. The gas mixing device for bottom blowing in induction furnace steelmaking according to claim 1, characterized in that: The interior of the mixing tube is provided with a porous air-permeable plate with a pore size not exceeding 5 nanometers, in which the mixed gas collides and breaks up, and recombine to achieve complete and uniform mixing.

4. The gas mixing device for bottom blowing in induction furnace steelmaking according to claim 1, characterized in that: A gas composition analyzer is provided in the final mixing chamber to ensure that the gas volume ratio is correct and the pressure meets the use conditions.

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