Three-stage bottom blowing oxygen lance and chaotic control method thereof

Abstract

The application provides a three-section type bottom blowing oxygen lance and a chaotic control method thereof, which comprises the following steps: a front section, the front section comprises an oxygen feeding part in communication with an oxygen supply device, an oxygen lance base fixedly connected with the oxygen feeding part, and a nitrogen feeding part in communication with a nitrogen supply device; a middle section, the middle section comprises an adjustable channel, the nitrogen feeding part and the oxygen feeding part are respectively in communication with the adjustable channel, the adjustable channel is connected with a driving assembly, and the driving assembly is electrically connected with a component assembly; a rear section, the rear section comprises a fixed channel, the fixed channel is connected with an outlet end of the adjustable channel, and an inlet end of the fixed channel is in communication with an outlet end of the adjustable channel; and a detection element is connected in a smelting furnace. The application can effectively judge the movement state of a melt, control the rotatable multi-hole channel rotation opening degree based on the detection element and the component assembly, realize nonlinear chaotic regulation of the blowing gas, make the melt keep in a chaotic state, and thus play a role in strengthening the smelting of a molten pool, improving the self-heating rate of the smelting of the molten pool and the operation rate.

Description

Technical Field

[0001] This invention belongs to the fields of metallurgy and energy engineering technology, and particularly relates to a three-stage bottom-blown oxygen lance and its chaotic control method. Background Technology

[0002] Oxygen bottom-blown smelting technology is a smelting process independently developed in my country. Due to its advantages such as strong raw material adaptability, high metal capture rate, and good slag performance, it has been adopted by many domestic and foreign companies. The oxygen lance is one of the core components of a bottom-blown smelting furnace. During the smelting process, gas is injected into the furnace through the lance, providing oxidant for the reaction and the power required for melt stirring, directly affecting the bottom-blown furnace load rate, operating rate, furnace life, furnace condition, and the energy consumption of auxiliary equipment.

[0003] Existing oxygen lance structures can only regulate the molten pool by changing the gas intake during non-stop smelting, but they cannot achieve nonlinear chaotic regulation of the injected gas flow rate based on the molten pool's motion state. This easily leads to uneven mixing of the melt, low furnace operating rate, and poor slag properties. Therefore, a device and method are needed that can monitor the molten pool's motion state and then control the oxygen lance structure to maintain the molten pool in a chaotic state. Summary of the Invention

[0004] The purpose of this invention is to provide a three-stage bottom-blowing oxygen lance and its chaotic control method to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following solution: a three-section bottom-blowing oxygen lance, comprising:

[0006] The front section includes an oxygen delivery section connected to an oxygen supply device, an oxygen gun base fixedly connected to the oxygen delivery section, and a nitrogen delivery section connected to a nitrogen supply device. The nitrogen delivery section is located outside the oxygen delivery section, and the oxygen gun base is connected to the nitrogen delivery section.

[0007] The middle section includes an adjustable channel, the air inlet of which is connected to the air outlet of the front section, the nitrogen supply section and the oxygen supply section are respectively connected to the adjustable channel, the adjustable channel is connected to a drive assembly, and the drive assembly is electrically connected to a component assembly.

[0008] The rear section includes a fixed channel connected to the outlet of the adjustable channel, and the inlet of the fixed channel connected to the outlet of the adjustable channel. The fixed channel is located inside the smelting furnace and is connected to the inner cavity of the smelting furnace. A detection element is connected inside the smelting furnace and is electrically connected to the component assembly.

[0009] Preferably, the oxygen delivery unit includes a reducing flange, the air inlet of the reducing flange is connected to the oxygen supply equipment, the air outlet of the reducing flange is fixedly connected to the air inlet of the oxygen gun base by bolts, an oxygen pipe is fixedly connected to the inner side of the oxygen gun base, a cavity is formed between the oxygen gun base and the oxygen pipe, and the air outlet of the oxygen pipe is connected to the air inlet of the adjustable channel.

[0010] Preferably, the nitrogen supply unit includes a nitrogen pipe and a three-way connector; the nitrogen pipe is coaxial with the oxygen pipe and is located outside the oxygen pipe; the outlet of the three-way connector and the inlet of the nitrogen pipe are respectively connected to the cavity; a necked flat-welded flange is fixedly connected between the inlet of the three-way connector and the nitrogen supply equipment; the outlet of the nitrogen pipe is connected to the inlet of the adjustable channel.

[0011] Preferably, the adjustable channel includes a rotatable multi-channel, in which an adjustable nitrogen channel and an adjustable oxygen channel are provided on the same axis. The adjustable nitrogen channel is located outside the adjustable oxygen channel. The inlet of the adjustable nitrogen channel is connected to the outlet of the nitrogen pipe, and the inlet of the adjustable oxygen channel is connected to the outlet of the oxygen pipe.

[0012] Preferably, bearings are connected between the rotatable multi-channel and the nitrogen pipe, and between the rotatable multi-channel and the fixed channel. The inlet and outlet ends of the rotatable multi-channel are rotatably connected to one end of each of the two bearings, and the other ends of the two bearings are fixedly connected to the outlet end of the nitrogen pipe and the inlet end of the fixed channel, respectively.

[0013] Preferably, the fixed channel includes a fixed multi-hole channel, in which a fixed nitrogen channel and a fixed oxygen channel are provided on the same axis. The fixed nitrogen channel is located outside the fixed oxygen channel. The inlet of the fixed nitrogen channel is connected to the outlet of the adjustable nitrogen channel, and the inlet of the fixed oxygen channel is connected to the outlet of the adjustable oxygen channel.

[0014] Preferably, the fixed multi-channel is located inside the smelting furnace.

[0015] Preferably, a copper sealing gasket is provided between the outlet end of the reducing flange and the inlet end of the oxygen lance base.

[0016] Preferably, the bearing is provided with an oil seal.

[0017] A chaos control method, the specific steps of which include:

[0018] First, the motion state of the melt is obtained from the smelting furnace;

[0019] Secondly, based on the aforementioned melt motion state, the chaotic state of the melt is determined;

[0020] Then, based on the chaotic state information of the solution, the chaotic program command is obtained;

[0021] Finally, based on the chaotic program command, the gas flow rate is controlled by the oxygen lance to achieve a nonlinear change in the gas flow rate.

[0022] The present invention has the following technical effects: the oxygen supply equipment delivers oxygen to the oxygen delivery section, and the nitrogen supply equipment delivers nitrogen to the nitrogen delivery section; through the detection element, the movement state of the melt in the melting furnace can be monitored, and the movement state signal can be fed back to the component assembly, so that the component assembly can issue control commands to the adjustable channel according to the signal, thereby controlling the opening of the adjustable channel; when oxygen and nitrogen pass through the adjustable channel, the gas flow rate entering the fixed channel achieves non-linear change, which enhances the melting of the molten pool, and the non-linear change can, to a certain extent, prevent the lance from being blocked during the melting process, and improve the service life and working efficiency of the oxygen lance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a frontal sectional view of a three-section bottom-blown oxygen lance.

[0025] Figure 2 for Figure 1 A magnified view of part A in the image;

[0026] Figure 3 for Figure 1 Sectional view of BB;

[0027] Figure 4 This is a schematic diagram showing the combination of a rotatable multi-channel and a fixed multi-channel.

[0028] Figure 5 Here is a flowchart of the chaos control method;

[0029] The components include: 1. reducing flange; 2. copper gasket; 3. oxygen lance base; 4. nitrogen pipe; 5. oxygen pipe; 6. rotatable multi-channel; 601. adjustable nitrogen channel; 602. adjustable oxygen channel; 7. bearing; 8. fixed multi-channel; 9. necked flat-welded flange; 10. bolt; 11. tee connector; 12. cavity; 13. smelting furnace; 14. pressure monitor; 15. oscilloscope; 16. PID controller; 17. PLC controller; 18. drive assembly. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figure 1-5 As shown, the present invention provides a three-section bottom-blown oxygen lance, comprising:

[0033] The front section includes an oxygen delivery section connected to an oxygen supply device, an oxygen gun base 3 fixedly connected to the oxygen delivery section, and a nitrogen delivery section connected to a nitrogen supply device. The nitrogen delivery section is located outside the oxygen delivery section, and the oxygen gun base 3 is connected to the nitrogen delivery section.

[0034] The middle section includes an adjustable channel, the air inlet of which is connected to the air outlet of the front section, the nitrogen supply section and the oxygen supply section are respectively connected to the adjustable channel, the adjustable channel is connected to a drive assembly, and the drive assembly is electrically connected to a component assembly.

[0035] The rear section includes a fixed channel connected to the outlet of the adjustable channel, and the inlet of the fixed channel connected to the outlet of the adjustable channel. The fixed channel is located inside the smelting furnace 13 and communicates with the inner cavity of the smelting furnace 13. A detection element is connected inside the smelting furnace 13 and is electrically connected to the component assembly. The oxygen supply device supplies oxygen to the oxygen delivery section, and the nitrogen supply device supplies nitrogen to the nitrogen delivery section. The detection element can monitor the movement state of the melt inside the smelting furnace 13 and feed back the movement state signal to the component assembly, enabling the component assembly to issue control commands to the adjustable channel based on the signal, thereby controlling the opening of the adjustable channel. When oxygen and nitrogen pass through the adjustable channel, the gas flow rate entering the fixed channel changes non-linearly. This non-linear change can, to some extent, prevent the oxygen lance from clogging during the smelting process, improving the service life and working efficiency of the oxygen lance.

[0036] In a further optimized design, the oxygen delivery unit includes a reducing flange 1, the air inlet of which is connected to the oxygen supply equipment, the air outlet of which is fixedly connected to the air inlet of the oxygen gun base 3 by bolts 10, an oxygen pipe 5 is fixedly connected to the inside of the oxygen gun base 3, a cavity 12 is formed between the oxygen gun base 3 and the oxygen pipe 5, and the air outlet of the oxygen pipe 5 is connected to the air inlet of the adjustable channel.

[0037] In a further optimized scheme, the nitrogen supply unit includes a nitrogen pipe 4 and a three-way connector 11; the nitrogen pipe 4 is coaxial with the oxygen pipe 5 and is located outside the oxygen pipe 5; the outlet of the three-way connector 11 and the inlet of the nitrogen pipe 4 are respectively connected to the cavity 12; a necked flat-welded flange 9 is fixedly connected between the inlet of the three-way connector 11 and the nitrogen supply equipment; and the outlet of the nitrogen pipe 4 is connected to the inlet of the adjustable channel.

[0038] In a further optimized design, the adjustable channel includes a rotatable porous channel 6. Within the rotatable porous channel 6 are coaxial adjustable nitrogen channel 601 and adjustable oxygen channel 602. The adjustable nitrogen channel 601 is located outside the adjustable oxygen channel 602. The inlet of the adjustable nitrogen channel 601 is connected to the outlet of the nitrogen pipe 4, and the inlet of the adjustable oxygen channel 602 is connected to the outlet of the oxygen pipe 5. The adjustable nitrogen channel 601 and the nitrogen pipe 4, and the adjustable oxygen channel 602 and the oxygen pipe 5 are correspondingly arranged. The flow rates of oxygen and nitrogen are controlled by adjusting the opening of the rotatable porous channel 6.

[0039] In a further optimized design, bearings 7 are connected between the rotatable porous channel 6 and the nitrogen pipe 4, and between the rotatable porous channel 6 and the fixed channel. The inlet and outlet ends of the rotatable porous channel 6 are rotatably connected to one end of each of the two bearings 7, and the other ends of the two bearings 7 are fixedly connected to the outlet end of the nitrogen pipe 4 and the inlet end of the fixed channel, respectively.

[0040] In a further optimized design, the fixed channel includes a fixed porous channel 8, within which coaxial fixed nitrogen and fixed oxygen channels are formed. The fixed nitrogen channel is located outside the fixed oxygen channel. The inlet of the fixed nitrogen channel is connected to the outlet of the adjustable nitrogen channel 601, and the inlet of the fixed oxygen channel is connected to the outlet of the adjustable oxygen channel 602. Based on the monitoring information of the melt changes within the smelting furnace 13 by the detection element, the fixed nitrogen and fixed oxygen channels deliver oxygen and nitrogen with varying flow rates to the smelting furnace 13.

[0041] In a further optimized design, the fixed multi-hole channel 8 is located inside the smelting furnace 13.

[0042] To further optimize the design, a copper sealing gasket 2 is provided between the outlet end of the reducing flange 1 and the inlet end of the oxygen lance base 3 to prevent air leakage.

[0043] To further optimize the design, an oil seal is installed inside the bearing 7.

[0044] In a further optimized design, the detection element is a pressure monitor 14. This monitor is used to detect the movement state of the melt within the melting furnace 13 and to provide feedback on the melt movement state.

[0045] The optimized solution includes an oscilloscope 15, a PID controller 16, a PLC controller 17, and a drive component 18.

[0046] A chaos control method, the specific steps of which include:

[0047] Oxygen and nitrogen enter the three-stage bottom-blowing oxygen lance from the oxygen delivery section and the nitrogen delivery section, respectively;

[0048] b. Oxygen and nitrogen are injected into the smelting furnace 13 in a non-linear manner under the action of the adjustable channel;

[0049] c. The detection element inside the smelting furnace 13 acquires information about the movement state of the melt and converts the melt movement state into an electrical signal, which is then transmitted to the component assembly.

[0050] The component d determines and acquires the chaotic state information inside the smelting furnace 13 based on the electrical signal of the detection element;

[0051] The component e issues a chaos program command based on the chaos state information;

[0052] The chaotic program command controls the rotation angle of the adjustable channel, i.e. the opening of the adjustable channel, through the component, thereby realizing the nonlinear change of gas flow rate;

[0053] The chaotic program command mentioned in g is implemented based on the Logistic mapping to generate a chaotic sequence. This sequence has ergodicity and unpredictability, and its formula is:

[0054] x i+1 =kx i (1-x i ); where k∈[0,4] is called the Logistic parameter, x∈[0,1].

[0055] The working process of this embodiment is as follows: the pressure monitor 14, oscilloscope 15, PID controller 16, PLC controller 17, and drive assembly 18 are electrically connected.

[0056] First, oxygen and nitrogen are supplied to the three-stage bottom-blowing oxygen lance through the oxygen supply equipment and the nitrogen supply equipment, respectively, from the reducing flange 1 and the necked flat-welding flange 9. Under the action of the rotatable multi-channel 6, the oxygen and nitrogen are injected into the melting furnace 13 in a non-linear manner. The rotatable multi-channel 6 is adjusted in the following way:

[0057] The pressure monitor 14 is installed inside the smelting furnace 13. The pressure monitor 14 monitors the internal conditions of the smelting furnace 13, obtains the melt motion state information, and converts the melt motion state into an electrical signal and transmits it to the oscilloscope 15 to obtain the waveform change information of the oscilloscope 15. The PID controller 16 determines the chaotic state of the melt inside the smelting furnace 13 based on the waveform change information. Then, the PID controller 16 issues a chaotic program command based on the chaotic state. The chaotic program command is transmitted to the PLC controller 17. The PLC controller 17 converts the chaotic program command into a start signal and transmits it to the drive component 18, so that the drive component 18 obtains the rotation signal of the rotatable multi-channel 6. The rotation signal includes a specific rotation angle signal, i.e., the opening of the rotatable multi-channel 6, which changes the gas flow rate between the adjustable nitrogen channel 601 and the oxygen pipe 5, and between the adjustable oxygen channel 602 and the nitrogen pipe 4. Thus, the gas flow rate through the fixed multi-channel 8 achieves nonlinear change.

[0058] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A three-section bottom-blowing oxygen lance, characterized in that, include: The front section includes an oxygen delivery section connected to the oxygen supply equipment, an oxygen gun base (3) fixedly connected to the oxygen delivery section, and a nitrogen delivery section connected to the nitrogen supply equipment. The nitrogen delivery section is located outside the oxygen delivery section, and the oxygen gun base (3) is connected to the nitrogen delivery section. The middle section includes an adjustable channel, the air inlet of which is connected to the air outlet of the front section, the nitrogen supply section and the oxygen supply section are respectively connected to the adjustable channel, the adjustable channel is connected to a drive assembly, and the drive assembly is electrically connected to a component assembly. The rear section includes a fixed channel connected to the outlet end of the adjustable channel, and the inlet end of the fixed channel connected to the outlet end of the adjustable channel. The fixed channel is located inside the smelting furnace (13) and is connected to the inner cavity of the smelting furnace (13). A detection element is connected inside the smelting furnace (13), and the detection element is electrically connected to the component assembly. The oxygen delivery unit includes a reducing flange (1), the air inlet of the reducing flange (1) is connected to the oxygen supply equipment, the air outlet of the reducing flange (1) is fixedly connected to the air inlet of the oxygen gun base (3) by bolts (10), an oxygen pipe (5) is fixedly connected to the inside of the oxygen gun base (3), a cavity (12) is formed between the oxygen gun base (3) and the oxygen pipe (5), and the air outlet of the oxygen pipe (5) is connected to the air inlet of the adjustable channel; The nitrogen supply unit includes a nitrogen pipe (4) and a three-way connector (11); the nitrogen pipe (4) is coaxial with the oxygen pipe (5) and is located outside the oxygen pipe (5); the outlet of the three-way connector (11) and the inlet of the nitrogen pipe (4) are respectively connected to the cavity (12); a necked flat welding flange (9) is fixedly connected between the inlet of the three-way connector (11) and the nitrogen supply equipment; the outlet of the nitrogen pipe (4) is connected to the inlet of the adjustable channel. The adjustable channel includes a rotatable multi-hole channel (6), in which a coaxial adjustable nitrogen channel (601) and an adjustable oxygen channel (602) are provided. The adjustable nitrogen channel (601) is located outside the adjustable oxygen channel (602). The inlet of the adjustable nitrogen channel (601) is connected to the outlet of the nitrogen pipe (4), and the inlet of the adjustable oxygen channel (602) is connected to the outlet of the oxygen pipe (5).

2. The three-section bottom-blowing oxygen lance according to claim 1, characterized in that: Bearings (7) are connected between the rotatable porous channel (6) and the nitrogen pipe (4), and between the rotatable porous channel (6) and the fixed channel. The inlet and outlet ends of the rotatable porous channel (6) are rotatably connected to one end of the two bearings (7), and the other ends of the two bearings (7) are fixedly connected to the outlet end of the nitrogen pipe (4) and the inlet end of the fixed channel, respectively.

3. A three-section bottom-blowing oxygen lance according to claim 1, characterized in that: The fixed channel includes a fixed porous channel (8), in which a fixed nitrogen channel and a fixed oxygen channel are provided on the same axis. The fixed nitrogen channel is located outside the fixed oxygen channel. The inlet of the fixed nitrogen channel is connected to the outlet of the adjustable nitrogen channel (601), and the inlet of the fixed oxygen channel is connected to the outlet of the adjustable oxygen channel (602).

4. A three-section bottom-blowing oxygen lance according to claim 3, characterized in that: The fixed multi-channel (8) is located inside the smelting furnace (13).

5. A three-section bottom-blowing oxygen lance according to claim 1, characterized in that: A copper sealing gasket (2) is provided between the outlet end of the reducing flange (1) and the inlet end of the oxygen lance base (3).

6. A three-section bottom-blowing oxygen lance according to claim 2, characterized in that: An oil seal is provided inside the bearing (7).

7. A chaos control method, characterized in that, According to any one of claims 1-6, the specific steps of a three-stage bottom-blowing oxygen lance include: First, the state of motion of the melt is obtained from the melting furnace (13); Secondly, based on the aforementioned melt motion state, the chaotic state of the melt is determined; Then, based on the chaotic state information of the solution, the chaotic program command is obtained; Finally, based on the chaotic program command, the gas flow rate is controlled by the oxygen lance to achieve a nonlinear change in the gas flow rate.

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