Converter smelting bottom blowing carbon dioxide injection device

Abstract

The utility model relates to the technical field of metallurgical converter bottom blowing equipment, in particular to a converter smelting bottom blowing carbon dioxide jetting device which comprises a bottom blowing nozzle and a pressurizing sprayer, the bottom blowing nozzle is installed at the bottom of a converter and provided with a gas jetting shell, a mixing cavity is formed in the rear portion of the gas jetting shell, and a plurality of gas inlets are communicated with the mixing cavity. A filling layer is arranged on the inner side of the rear portion of the air injection shell, a plurality of air injection pipes are arranged in the filling layer, and pressurizing spray heads are installed in the air injection pipes and provided with main air outlets and a plurality of side air outlets. By adopting the mixed nozzle structure, the mixed gas of carbon dioxide, nitrogen and argon is realized, the diversified and effective blowing of smelting gas in the converter is realized, and the bottom blowing efficiency is improved; the pressurizing nozzle is adopted, the gas output is not affected, the gas output pressure is improved, the pressure of gas entering the converter is increased, gas waste is avoided, energy consumption is reduced, and the bottom blowing effect is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of bottom blowing equipment for metallurgical converters, specifically to a carbon dioxide injection device for bottom blowing in converter smelting. Background Technology

[0002] Bottom blowing technology in converter steelmaking is an important process in modern steel production, primarily used to improve the efficiency and quality of converter steelmaking. Bottom blowing refers to blowing gases (such as oxygen, argon, nitrogen, etc.) into the molten pool through nozzles located at the bottom of the converter to promote agitation and uniform distribution of reactants within the molten pool. As an effective auxiliary method, bottom blowing technology plays a crucial role in improving the quality and efficiency of converter steelmaking. With continuous technological innovation and development, the application prospects of bottom blowing technology will become even broader.

[0003] Currently, bottom-blowing equipment directly installs the nozzle pipe into the mounting groove outside the permeable brick. Because the nozzle uses a straight-through pipe without pressurization, the gas exiting the nozzle cannot form effective pressure. The low pressure after the gas passes through the permeable brick results in waste and poor bottom-blowing effect. Increasing the gas pressure through external pressurization equipment also wastes energy. Therefore, it is necessary to design a bottom-blowing carbon dioxide injection device for converter smelting to increase the nozzle's injection pressure and solve the problems of low gas pressure and high energy consumption in the current bottom-blowing equipment. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide an injection device for bottom blowing carbon dioxide in converter smelting.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an injection device for bottom blowing carbon dioxide in converter smelting, including a bottom blowing nozzle and a pressurized nozzle. The bottom blowing nozzle is installed at the bottom of the converter. The bottom blowing nozzle is provided with a jet shell. A mixing chamber is provided at the rear of the jet shell. Multiple air inlets are connected to the mixing chamber. A filling layer is provided on the inner side of the rear of the jet shell. Multiple jet pipes are provided in the filling layer. A pressurized nozzle is installed in the jet pipe. The pressurized nozzle is provided with a main air outlet and multiple side air outlets.

[0006] Specifically, the bottom of the converter is provided with multiple bottom blowing mounting holes, and permeable bricks are provided in the bottom blowing mounting holes. Protective bricks are provided on the outer periphery of the permeable bricks. The inner sides of both the permeable bricks and the protective bricks extend into the converter. The length of the permeable bricks is less than the length of the protective bricks to form the mounting groove for the bottom blowing nozzles.

[0007] Specifically, the bottom blowing nozzle is installed in the mounting groove of the bottom blowing nozzle, and the air inlet at the rear of the bottom blowing nozzle includes air inlet one, air inlet two and air inlet three, all of which are connected to the mixing chamber.

[0008] Specifically, the flange outside the first air inlet is bolted to a carbon dioxide inlet pipe, the flange outside the second air inlet is bolted to an argon inlet pipe, and the flange outside the third air inlet is bolted to a nitrogen inlet pipe.

[0009] Specifically, the end of the jet pipe is provided with a baffle, which blocks the reduced diameter pipe of the pressurized nozzle. The rear of the reduced diameter pipe is connected to the main pipe, and the front of the reduced diameter pipe is connected to the inclined pipe.

[0010] Specifically, the front of the inclined tube is provided with a main air outlet, and the side wall of the inclined tube is provided with multiple side air outlets.

[0011] Specifically, the baffle is an annular baffle, the inner diameter of which is smaller than the outer diameter of the main body, and the annular baffle is fixed to the end of the jet pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The converter smelting bottom-blowing carbon dioxide injection device designed in this utility model adopts a mixed nozzle structure to achieve selective mixing of carbon dioxide, nitrogen and argon, thereby realizing diversified and effective blowing of smelting gases in the converter and improving the efficiency of bottom blowing.

[0014] The converter smelting bottom-blowing carbon dioxide injection device designed in this utility model adopts pressurized nozzles. Each injection pipe is equipped with a pressurized nozzle, which has multiple gas outlets. This does not affect the gas output and increases the gas pressure, thereby increasing the gas pressure entering the converter, avoiding gas waste, reducing energy consumption, and improving the bottom-blowing effect. Attached Figure Description

[0015] Figure 1 A schematic diagram of the installation structure of the injection device for bottom-blown carbon dioxide in converter smelting;

[0016] Figure 2 A schematic diagram of the external structure of the injection device for bottom-blown carbon dioxide in converter smelting;

[0017] Figure 3 A schematic diagram of the internal structure of the bottom-blown carbon dioxide injection device for converter smelting;

[0018] Figure 4 This is a schematic diagram of the internal structure of a pressurized nozzle.

[0019] In the diagram: 1-bottom blow nozzle, 101-air inlet one, 102-air inlet two, 103-air inlet three, 104-mixing chamber, 105-jet pipe, 106-jet housing, 107-filling layer;

[0020] 2-Pressure nozzle, 201-Main main body, 202-Reduced diameter pipe body, 203-Inclined pipe body, 204-Main air outlet, 205-Side air outlet; 3-Converter, 301-Bottom blowing mounting hole, 302-Permeable brick, 303-Protective brick. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] like Figures 1-4 As shown, a bottom-blowing carbon dioxide injection device for converter smelting includes a bottom-blowing nozzle 1 and a pressurized nozzle 2. The bottom-blowing nozzle 1 is installed at the bottom of the converter 3. The bottom of the converter 3 has multiple bottom-blowing mounting holes 301. A permeable brick 302 is installed inside each bottom-blowing mounting hole 301. The permeable brick 302 is a new product with a long service life and energy saving, featuring a reasonable structural design, good thermal stability, erosion resistance, corrosion resistance, and impermeability, high blowing efficiency, and safe and reliable operation. A protective brick 303 is provided around the outer periphery of the permeable brick 302. The inner sides of both the permeable brick 302 and the protective brick 303 extend into the converter 3. The length of the permeable brick 302 is less than the length of the protective brick 303. The recessed portion of the permeable brick 302 forms the mounting groove for the bottom-blowing nozzle 1.

[0023] The bottom-blowing nozzle 1 is provided with an air inlet, a mixing chamber 104, a jet pipe 105, a jet housing 106, and a filling layer 107. The jet housing 106 has a mixing chamber 104 at its rear, and multiple air inlets are connected to the mixing chamber 104. The jet housing 106 has a filling layer 107 on its rear inner side. The filling layer 107 is made of high-temperature resistant clay material. Four jet pipes 105 are provided inside the filling layer 107, and pressurized nozzles 2 are installed inside the jet pipes 105.

[0024] A bottom blowing nozzle 1 is installed in the mounting groove of the bottom blowing nozzle. The air inlet at the rear of the bottom blowing nozzle 1 includes an air inlet 101, an air inlet 2 102 and an air inlet 3 103. The air inlet 101, the air inlet 2 102 and the air inlet 3 103 are all connected to the mixing chamber 104.

[0025] The flange outside inlet 101 is bolted to a carbon dioxide inlet pipe. Carbon dioxide reacts with elements in the molten pool to generate CO gas, enhancing the stirring of the converter's molten pool and increasing the calorific value of the gas. The secondary combustion oxygen lance has a side-blowing auxiliary oxygen port, allowing for a larger auxiliary oxygen flow rate and increasing the secondary combustion rate of the rising gas. By re-blowing carbon dioxide gas to increase the calorific value of the gas, and then using the secondary combustion oxygen lance to directly utilize the heat of the gas within the furnace, effective direct furnace heating is achieved, thereby improving the energy utilization efficiency of the molten pool, increasing the scrap steel ratio, and reducing carbon emissions and per-ton steel costs in the converter process. The flange outside inlet 102 is bolted to an argon inlet pipe. Bottom-blowing argon effectively improves the converter's production efficiency. Firstly, by improving the uniformity of temperature within the furnace, bottom-blowing argon increases the melting rate and reaction rate of the metal, shortening the smelting cycle. Secondly, it promotes the flow and mixing of the molten metal, accelerating component homogenization and improving product quality. Finally, it reduces the emission of harmful gases, minimizing production interruptions and cleaning work, further improving production efficiency. The external flange of inlet 3103 is bolted to the nitrogen inlet pipe. Bottom-blown nitrogen achieves precise temperature control by adjusting the nitrogen flow rate and temperature, maintaining temperature stability in the reaction zone and thus improving product quality.

[0026] The pressurized nozzle 2 is provided with a main air outlet 204 and four side air outlets 205. The end of the jet pipe 105 is provided with a baffle, which blocks the reduced diameter pipe body 202 of the pressurized nozzle 2. The rear of the reduced diameter pipe body 202 is connected to the main pipe body 201, and the front of the reduced diameter pipe body 202 is connected to the inclined pipe body 203.

[0027] The front part of the inclined pipe body 203 is provided with a main air outlet 204, and the side pipe wall of the inclined pipe body is provided with four side air outlets 205.

[0028] The baffle is an annular baffle, the inner diameter of which is smaller than the outer diameter of the main body 201. The annular baffle is fixed to the end of the jet pipe 105.

[0029] This utility model is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model.

[0030] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bottom-blown carbon dioxide injection device for converter smelting, characterized in that, It includes a bottom blowing nozzle and a pressurizing nozzle. The bottom blowing nozzle is installed at the bottom of the converter. The bottom blowing nozzle has a jet shell. The rear part of the jet shell has a mixing chamber. The mixing chamber is connected to multiple air inlets. The inner side of the rear part of the jet shell has a filling layer. Multiple jet pipes are installed in the filling layer. The pressurizing nozzle is installed in the jet pipes. The pressurizing nozzle has a main air outlet and multiple side air outlets.

2. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 1, characterized in that, The bottom of the converter is provided with multiple bottom blowing mounting holes. A permeable brick is placed inside the bottom blowing mounting hole. A protective brick is placed around the outer periphery of the permeable brick. The inner sides of both the permeable brick and the protective brick extend into the converter. The length of the permeable brick is less than the length of the protective brick to form the mounting groove for the bottom blowing nozzle.

3. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 2, characterized in that, The bottom blowing nozzle is installed in the mounting groove of the bottom blowing nozzle. The air inlet at the rear of the bottom blowing nozzle includes air inlet one, air inlet two and air inlet three, and air inlet one, air inlet two and air inlet three are all connected to the mixing chamber.

4. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 3, characterized in that, The flange outside the first air inlet is bolted to a carbon dioxide inlet pipe, the flange outside the second air inlet is bolted to an argon inlet pipe, and the flange outside the third air inlet is bolted to a nitrogen inlet pipe.

5. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 1, characterized in that, The end of the jet pipe is provided with a baffle, which blocks the reduced diameter pipe of the pressurized nozzle. The rear of the reduced diameter pipe is connected to the main pipe, and the front of the reduced diameter pipe is connected to the inclined pipe.

6. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 5, characterized in that, The front part of the inclined tube is provided with a main air outlet, and the side wall of the inclined tube is provided with multiple side air outlets.

7. The injection device for bottom-blown carbon dioxide in converter smelting according to claim 5, characterized in that, The baffle is an annular baffle, the inner diameter of which is smaller than the outer diameter of the main body, and the annular baffle is fixed to the end of the jet pipe.

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