Multifunctional rotary desulfurization equipment and desulfurization method thereof

Abstract

The invention discloses multifunctional rotary desulfurization equipment and a desulfurization method thereof, and relates to the technical field of metallurgical steelmaking. The desulfurization main body equipment comprises a main body frame, a lifting guide rail, a lifting trolley, a lifting device, a desulfurization spray gun, a rotary driving device and clamping devices, at least two sets of clamping devices are symmetrically arranged on the outer side of the lifting trolley in the circumferential direction, and each clamping device comprises a roller support, an elastic clamping roller mechanism and a fixed clamping roller mechanism; the two clamping devices in the same group are arranged in pairs and are arranged in a mirror manner by taking the lifting guide rail as a symmetry plane; the steel ladle is filled with molten iron; the composite blowing system is used for blowing a desulfurizing agent into the desulfurization spray gun; the KR feeding system is used for adding a desulfurizing agent to the surface of the steel ladle; and a control device. The device can give full play to the technical advantages of rotary stirring desulfurization and blowing desulfurization, and solves the problems of insufficient functions, low desulfurization efficiency and the like of high-viscosity vanadium and titanium-containing molten iron desulfurization equipment.

Description

Technical Field

[0001] The present invention relates to the field of metallurgy and steelmaking technology, and more specifically, to a multifunctional rotary desulfurization device and a desulfurization method applied to the multifunctional rotary desulfurization device. Background Art

[0002] In existing technology, there are two main desulfurization methods: the KR method and the injection method. The KR method utilizes mechanical agitation to desulfurize molten iron. Specifically, while the molten iron is being desulfurized in a ladle, a desulfurizer is added to the ladle surface and a stirring head is used to thoroughly mix and react the desulfurizer with the molten iron. The advantages of the KR (Kambara Reactor) desulfurization method include: 1. It offers favorable desulfurization kinetics, facilitating the use of inexpensive desulfurizers and achieving superior desulfurization results; 2. Mechanical agitation ensures uniform mixing of the desulfurizer and molten iron; and 3. It enables deep desulfurization. However, the disadvantages and shortcomings of the KR desulfurization method are: 1. Since the desulfurizer of KR desulfurization is added from the surface of the molten iron, the high-temperature gas on the surface of the molten iron will cause part of the added desulfurizer to diffuse and float, resulting in a large amount of dust in the desulfurization workshop, a harsh working environment and a shortened equipment life; 2. In order to quickly rotate the desulfurizer into the molten iron, mix and react with the molten iron in the ladle, a high-power high-speed stirring device must be used. The equipment is expensive and complex, which increases energy consumption. Moreover, high-power stirring causes large eddies on the surface of the molten iron, large splashes and a large liquid level rise, which reduces the effective capacity of the ladle and results in a waste of resources; 3. Rotating the desulfurizer into the molten iron by mechanical stirring will cause the desulfurizer to clump and cannot be fully mixed with the molten iron, which increases the amount of desulfurizer used; 4. A dead zone is easily formed at the bottom of the stirring head, resulting in poor desulfurization uniformity of the molten iron.

[0003] The injection method uses a desulfurization gun to spray the desulfurizer into the molten iron through a carrier gas. The carrier gas also acts as a stirrer, mixing the spray gas, desulfurizer, and molten iron to desulfurize. The advantages of the injection method are: 1. Low cost; 2. The desulfurizer is sprayed directly into the molten iron, preventing it from agglomerating. However, the disadvantages of the injection method are: 1. The method has poor kinetic conditions. In order to fully mix the desulfurizer with the molten iron, a high air pressure and volume are required. However, this also brings the disadvantage of large bubbles, which burst on the surface of the molten iron, causing splashing. Moreover, the desulfurizer within the bubbles fails to mix and react with the molten iron, resulting in waste of desulfurizer; 2. Large blind spots make it difficult to achieve uniform desulfurization; 3. Deep desulfurization cannot be achieved, the desulfurization time is long, and the desulfurization rate is low. The desulfurization rate of the injection method is about 1 / 4 of that of the KR method.

[0004] At present, with the rapid development of social economy and steel industry, the requirements for steel quality are becoming higher and more stringent. Moreover, in recent years, with the gradual improvement of environmental standards and the country's requirements for cost reduction and efficiency improvement, the country's requirements for the environment and cost reduction and efficiency improvement of steel workshops have become increasingly stringent, causing the shortcomings of the above two desulfurization methods to gradually become prominent.

[0005] In summary, how to give full play to the technical advantages of rotary stirring desulfurization and injection desulfurization to solve the problems of insufficient function of high-viscosity vanadium and titanium molten iron desulfurization equipment and low desulfurization efficiency is an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a multifunctional rotary desulfurization equipment that can give full play to the technical advantages of rotary stirring desulfurization and injection desulfurization, and solve the problems of insufficient function and low desulfurization efficiency of high-viscosity vanadium and titanium molten iron desulfurization equipment.

[0007] Another object of the present invention is to provide a desulfurization method applied to the above-mentioned multifunctional rotary desulfurization equipment.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A multifunctional rotary desulfurization equipment, comprising:

[0010] Equipment platform;

[0011] The desulfurization main equipment includes a main frame arranged on the equipment platform, a lifting guide rail arranged on the inner side of the main frame, a lifting trolley that moves up and down along the lifting guide rail, a lifting device for driving the lifting trolley to lift and lower, a desulfurization spray gun, a rotary drive device for driving the desulfurization spray gun to rotate, and a clamping device, the rotary drive device is arranged on the lifting trolley, and the driving end of the rotary drive device passes through the lifting trolley and is connected to the desulfurization spray gun, at least two groups of the clamping devices are symmetrically arranged along the circumferential direction on the outer side of the lifting trolley, the clamping device includes a roller support vertically arranged on the outer side of the lifting trolley, an elastic clamping roller mechanism for elastically contacting the lifting guide rail, and a fixed clamping roller mechanism, the elastic clamping roller mechanism and the fixed clamping roller mechanism are both vertically arranged on the roller support, the fixed clamping roller mechanism is used to clamp or move away from the lifting guide rail, and the two clamping devices in the same group are arranged in pairs and are mirror-arranged with the lifting guide rail as the symmetry plane;

[0012] a ladle, which contains molten iron;

[0013] A composite injection system, which is used to blow the desulfurization agent into the desulfurization spray gun;

[0014] A KR feeding system for adding the desulfurizer to the surface of the ladle;

[0015] The control device, the lifting device, the rotary drive device, the fixed clamping roller mechanism, the composite blowing system and the KR feeding system are all connected to the control device.

[0016] In one embodiment, two gun-changing devices for replacing the desulfurization spray gun are further included, and the two gun-changing devices are respectively arranged on both sides of the desulfurization main equipment.

[0017] In one embodiment, the lifting device includes a lifting drive motor, a reducer, a hoist, a pulley block, a steel wire rope, and a tension detection device for detecting whether the steel wire rope is evenly stressed or slack. The lifting drive motor is connected to the reducer, and the reducer is connected to the hoist.

[0018] The lifting drive motor, the reducer and the winch are all arranged above the main frame, the fixed pulley of the pulley group and the end support of the wire rope are both arranged on the top of the main frame, the movable pulley of the pulley group is arranged in the lifting trolley, one end of the wire rope is wound around the winch, and the other end of the wire rope is passed around the fixed pulley and connected to the movable pulley, the lifting drive motor and the tension detection device are both connected to the control device.

[0019] In one embodiment, it further includes a slag removal device for removing slag on the desulfurization lance and a cooling device for circulating cooling gas into the desulfurization lance, and the slag removal device and the cooling device are both connected to the control device.

[0020] In one embodiment, the slag removal device includes a vertically arranged scraper, a swing arm, a power unit for driving the swing arm to rotate, a transfer support for connecting the scraper and one end of the swing arm, and a mounting support. The other end of the swing arm is mounted on the power unit. The power unit can be raised and lowered on the mounting support through a guide rod and a limit bolt. The mounting support is arranged on the main frame.

[0021] In one embodiment, the lifting trolley includes a trolley frame and lifting guide wheels, the lifting guide wheels are symmetrically arranged at the upper and lower end positions of the trolley frame, and the lifting guide wheels roll along the lifting guide rails.

[0022] In one embodiment, the composite blowing system includes a composite desulfurizer silo filled with desulfurizer, a first auxiliary blowing pipe connected to the discharge port of the composite desulfurizer silo, and a first nitrogen pipe for introducing nitrogen. The first nitrogen pipe is connected to the first auxiliary blowing pipe, the stirring shaft of the rotary drive device is connected to the first auxiliary blowing pipe through a rotary joint, and the stirring shaft and the desulfurization spray gun are coaxially connected.

[0023] In one embodiment, the KR feeding system includes a KR desulfurizer silo filled with the desulfurizer, a second blow-assist pipe connected to the discharge port of the KR desulfurizer silo, a second nitrogen pipe for introducing nitrogen, a fixed chute, a movable chute movably embedded in the fixed chute, and a transmission device for driving the movable chute to move, the movable chute rolls along the fixed chute through a guide wheel, the second nitrogen pipe is connected to the second blow-assist pipe, and the second blow-assist pipe is connected to the fixed chute.

[0024] A desulfurization method, applied to any of the multifunctional rotary desulfurization equipment described above, comprising:

[0025] After the desulfurization lance is installed in place, the ladle is moved below the desulfurization lance;

[0026] The lifting device drives the lifting trolley to descend along the lifting guide rail, so that the desulfurization lance is lowered to the upper surface of the molten iron in the ladle;

[0027] The rotary drive device drives the desulfurization lance to rotate, and selectively controls the composite injection system to inject the desulfurizer into the desulfurization lance, or controls the KR feeding system to add the desulfurizer to the upper surface of the molten iron;

[0028] The lifting device drives the lifting trolley to descend along the lifting guide rail, so that the desulfurization lance descends to the stirring position. At this time, the fixed clamping roller mechanism is controlled to clamp the lifting guide rail, and the speed and direction of the rotary drive device are set according to the parameter requirements of the molten iron;

[0029] After the desulfurization operation of the ladle is completed, the composite blowing system or the KR feeding system is controlled to stop running, the fixed clamping roller mechanism is controlled to return to the initial position, and the lifting device is controlled to drive the lifting trolley to rise to the initial position along the lifting guide rail to remove the ladle.

[0030] In one embodiment, the removing of the ladle, after that, comprises:

[0031] Determine whether the desulfurization spray gun is damaged. If not, control the lifting device to drive the lifting trolley to move along the lifting guide rail to a waiting position to prepare for the next desulfurization operation;

[0032] If so, control the empty gun changing device to move to the gun changing position to place the damaged desulfurization spray gun on the gun changing device, control the gun changing device equipped with the damaged desulfurization spray gun to leave the gun changing position, control the gun changing device equipped with the new gun to move to the gun changing position, control the hydraulic cylinder of the gun changing device to lift the new desulfurization spray gun so that the new desulfurization spray gun is installed into the driving end of the rotary drive device, control the gun changing device to leave the gun changing position, and return to the desulfurization spray gun after it is installed in place, and then the ladle moves to under the desulfurization spray gun.

[0033] When using the multifunctional rotary desulfurization equipment provided by the present invention, a stirring blade can be installed at the bottom of the desulfurization lance, and a nozzle for spraying desulfurizer can be set at the bottom of the desulfurization lance. First, the desulfurization lance is installed in place, and the ladle is moved under the equipment platform and aligned with the bottom of the desulfurization lance. Then, the control device controls the operation of the lifting device to drive the lifting trolley to descend along the lifting guide rails, lowering the desulfurization lance to the upper surface of the molten iron in the ladle. Afterwards, the control device controls the operation of the rotary drive device to drive the desulfurization lance to rotate, and selectively controls the composite blowing system to spray desulfurizer into the desulfurization lance, or controls the KR feeding system to add desulfurizer to the upper surface of the molten iron. That is, according to the desulfurization conditions and process requirements, the KR method (that is, adding the desulfurizer to the upper surface of the molten iron in the ladle, and then using the stirring blades of the desulfurization lance to fully mix and react the desulfurizer and molten iron) can be selected as the main method for desulfurization, or the blowing method (that is, spraying the desulfurizer into the molten iron in the ladle through the blowing port of the desulfurization lance, and blowing gas can be blown in at the same time, and the stirring blades of the desulfurization lance are controlled to stir, so that the blowing gas, desulfurizer and molten iron are mixed for desulfurization) can be selected as the main method for desulfurization.

[0034] Subsequently, the control device controls the lifting device to continue operating, driving the trolley down along the guide rails, lowering the desulfurization lance to the stirring position. At this point, the control device controls the rotary drive device to increase its speed. Simultaneously, as the rotary drive device drives the desulfurization lance to rotate and stir the molten iron, the trolley is subject to significant circumferential and radial forces. Relying solely on the elastic clamping roller mechanism to clamp the guide rails is insufficient to prevent trolley wobbling. Therefore, the control device controls the fixed clamping roller mechanism to clamp the guide rails, thereby securing the guide rails and preventing irregular wobbling during the rotation of the desulfurization lance. Finally, after the desulfurization operation of the ladle is complete (i.e., no rotation of the desulfurization lance is required to stir the molten iron), the composite injection system or KR feeding system is deactivated. Simultaneously, the control device controls the fixed clamping roller mechanism to return to its initial position. At this point, the desulfurization lance no longer needs to rotate, and the trolley is subject to minimal or no circumferential and radial forces. Relying solely on the elastic clamping roller mechanism to clamp the guide rails prevents trolley wobbling. At the same time, the control device can control the lifting device to run in reverse to drive the lifting trolley to rise along the lifting guide rail to the initial position (i.e., the waiting position), and then remove the desulfurized ladle so that the new ladle can be desulfurized.

[0035] By using this device, desulfurization can be performed primarily using either the KR method or the injection method on the same desulfurization equipment, depending on the desulfurization conditions and process requirements. When using the KR method for desulfurization, inert gas can be injected into the desulfurization lance to improve the dynamic conditions at the base of the lance. The lance can be raised and lowered simultaneously during agitation and rotated bidirectionally, ensuring thorough mixing and reaction between the molten iron and the desulfurizer, fundamentally avoiding dead zones and poor uniformity in desulfurization. When using the injection method for desulfurization, the desulfurizer is injected into the molten iron in the ladle through the lance. Simultaneously, the lance selection is controlled to achieve mechanical agitation. During mechanical agitation, the lance's elevation and rotation can be switched bidirectionally. This eliminates the need for high air pressure and volume when injecting the desulfurizer, preventing the generation of large bubbles and, consequently, splashing on the molten iron surface. This improves desulfurizer utilization and the desulfurization working environment. That is, this device comprehensively utilizes the advantages of mechanical stirring desulfurization and injection desulfurization, and overcomes the shortcomings of each of them. It is beneficial to improve the on-site working environment and improve the efficiency of molten steel desulfurization.

[0036] In summary, the multifunctional rotary desulfurization equipment provided by the present invention can give full play to the technical advantages of rotary stirring desulfurization and injection desulfurization, and solve the problems of insufficient function and low desulfurization efficiency of high-viscosity vanadium and titanium molten iron desulfurization equipment.

[0037] In addition, the present invention also provides a desulfurization method applied to the above-mentioned multifunctional rotary desulfurization equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] Figure 1 This is a front view of the multifunctional rotary desulfurization equipment provided by the present invention;

[0040] Figure 2 This is the rear view of the multifunctional rotary desulfurization equipment;

[0041] Figure 3 This is a side view of the multifunctional rotary desulfurization equipment;

[0042] Figure 4 This is a structural diagram of the multifunctional rotary desulfurization equipment;

[0043] Figure 5 This is a top view of the multifunctional rotary desulfurization equipment;

[0044] Figure 6 It is a structural diagram of the clamping device and the lifting guide rail;

[0045] Figure 7 A schematic diagram of the structure of the fixed clamping roller mechanism clamping the lifting guide rail;

[0046] Figure 8 This is a schematic flow chart of the desulfurization method provided by the present invention.

[0047] Figures 1-8 middle:

[0048] 1 is the equipment platform, 11 is the walking guide rail, 2 is the main desulfurization equipment, 21 is the main frame, 22 is the lifting guide rail, 23 is the lifting trolley, 24 is the lifting device, 241 is the lifting drive motor, 242 is the reducer, 243 is the winch, 244 is the pulley block, 245 is the wire rope, 25 is the desulfurization spray gun, 26 is the rotary drive device, 261 is the rotary joint, 262 is the rotary reducer, 27 is the clamping device, 271 is the elastic clamping roller mechanism, 2711 is the roller support, 2712 is the elastic member, 2713 is the second guide wheel, 272 is the fixed clamping roller mechanism, 2721 is the actuator, 2722 is the transmission mechanism, 2723 is the eccentric rocker, 2724 is the first guide wheel, 28 is the stirring blade, 3 is the ladle, 4 is the composite blowing system, 41 is the composite desulfurizer silo, 42 is the first blowing-assisting pipe, 43 is the first nitrogen pipe, 5 is the KR feeding system, 51 is the KR desulfurizer silo, 52 is the second blowing-assisting pipe, 53 is the second nitrogen pipe, 54 is the fixed chute, 55 is the movable chute, 56 is the guide wheel, 6 is the gun changing device, 61 is the gun changing car, 62 is the walking wheel, 7 is the slag removal device, 71 is the scraper, 72 is the swing arm, 73 is the power unit, 74 is the transfer support, and 75 is the installation support. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] The core of this invention is to provide a multifunctional rotary desulfurization system that can fully utilize the technical advantages of rotary agitation desulfurization and injection desulfurization to address the problems of insufficient functionality and low desulfurization efficiency of high-viscosity vanadium- and titanium-containing hot metal desulfurization equipment. Another core of the invention is to provide a desulfurization method applicable to this multifunctional rotary desulfurization system.

[0051] Please refer to Figures 1 to 5 This specific embodiment provides a multifunctional rotary desulfurization equipment, including:

[0052] Equipment platform 1;

[0053] The desulfurization main equipment 2 includes a main frame 21 provided on the equipment platform 1, a lifting guide rail 22 provided on the inner side of the main frame 21, a lifting trolley 23 that moves up and down along the lifting guide rail 22, a lifting device 24 for driving the lifting trolley 23 to move up and down, a desulfurization spray gun 25, a rotary drive device 26 for driving the desulfurization spray gun 25 to rotate, and a clamping device 27. The rotary drive device 26 is provided on the lifting trolley 23, and the driving end of the rotary drive device 26 passes through the lifting trolley 23 and is connected to the desulfurization spray gun 25. The outer side of the lifting trolley 23 is connected to the desulfurization spray gun 25. At least two groups of clamping devices 27 are symmetrically provided along the side surface in the circumferential direction. The clamping devices 27 include a roller support 2711 vertically provided on the outside of the lifting trolley 23, an elastic clamping roller mechanism 271 for elastically contacting the lifting guide rail 22, and a fixed clamping roller mechanism 272. The elastic clamping roller mechanism 271 and the fixed clamping roller mechanism 272 are both vertically provided on the roller support 2711. The fixed clamping roller mechanism 272 is used to clamp or move away from the lifting guide rail 22. The two clamping devices 27 in the same group are provided in pairs and are arranged in a mirrored manner with the lifting guide rail 22 as the symmetry plane.

[0054] Ladle 3, which contains molten iron;

[0055] The composite injection system 4 is used to inject the desulfurization agent into the desulfurization spray gun 25;

[0056] A KR feeding system 5 for feeding the desulfurizing agent into the surface of the ladle 3;

[0057] The control device, the lifting device 24, the rotary drive device 26, the fixed clamping roller mechanism 272, the composite blowing system 4 and the KR feeding system 5 are all connected to the control device.

[0058] It should be noted that a stirring blade 28 can be sleeved on the lower part of the desulfurization lance 25, and a blowing port for spraying the desulfurizer can be set at the bottom of the desulfurization lance 25. The main frame 21 can be welded by steel sections, and the main frame 21 includes four columns and a top frame arranged on the top of the four columns. The four columns are generally in a quadrilateral frame structure. The four columns are preferably I-steel or H-steel. Other profiles such as rectangular tubes can also be selected according to different force forms. The top frame is welded by steel sections and can serve as a working platform for the lifting device 24. The number of lifting guide rails 22 is 2 or 4. The lifting guide rails 22 are located on the inner side of the columns and are fixedly connected to the corresponding columns respectively. The upgrading trolley is slidably arranged in the main frame 21. The operation of the lifting device 24 can be controlled according to the process operation requirements to drive the lifting trolley 23 to rise or fall along the lifting guide rails 22.

[0059] It should also be noted that if Figure 6 and Figure 7 As shown, Figure 6 Schematic diagram of the fixed clamping roller mechanism 272 not clamping the lifting guide rail 22. Figure 7The schematic diagram of the fixed clamping roller mechanism 272 clamping the lifting guide rail 22 is that the clamping device 27 includes a roller support 2711 vertically arranged on the outside of the lifting trolley 23, an elastic clamping roller mechanism 271 and a fixed clamping roller mechanism 272, that is, the lifting trolley 23 is fixed on the lifting guide rail 22 by combining elastic clamping with fixed clamping. Each clamping device 27 includes an elastic clamping roller mechanism 271 and a fixed clamping roller mechanism 272 arranged parallel to the elastic clamping roller mechanism 271, and the two clamping devices 27 in the same group are combined in pairs and arranged in a mirrored manner with the lifting guide rail 22 as the symmetry plane. Moreover, the roller support 2711 of the clamping device 27 can be fixedly connected to the frame of the lifting trolley 23 by bolts. And multiple groups of clamping devices 27 are arranged in pairs symmetrically along the circumference of the outer side of the lifting trolley 23 frame, and the number of arranged groups is 2-4 groups. As shown in FIG. Figure 6 and Figure 7 As shown, it comprises four groups of clamping devices 27, namely eight elastic clamping roller mechanisms 271 and eight fixed clamping roller mechanisms 272. In addition, the rotation drive device 26 can be installed on the lifting trolley 23.

[0060] Furthermore, it should be noted that the lifting device 24 is used to control the ascent and descent of the lifting trolley 23 on the lifting guide rail 22. When the rotary drive device 26 is not driving the desulfurization lance 25 to rotate (i.e., the desulfurization lance 25 is not required to stir the molten iron), the circumferential and radial forces acting on the lifting trolley 23 are minimal or nonexistent. Simply clamping the lifting guide rail 22 with the elastic clamping roller mechanism 271 can prevent the lifting trolley 23 from shaking. However, when the rotary drive device 26 is driving the desulfurization lance 25 to rotate (i.e., the desulfurization lance 25 is required to stir the molten iron), the circumferential and radial forces acting on the lifting trolley 23 are significant. Simply clamping the lifting guide rail 22 with the elastic clamping roller mechanism 271 cannot prevent the lifting trolley 23 from shaking. Therefore, it is necessary to control the operation of the fixed clamping roller mechanism 272 to tighten the lifting guide rail 22 and prevent irregular shaking of the desulfurization lance 25 during rotation.

[0061] Furthermore, both the first guide wheel 2724 of the fixed clamping roller mechanism 272 and the second guide wheel 2713 of the elastic clamping roller mechanism 271 can clamp the lifting guide rail 22, allowing the lifting device 24 to raise and lower the lifting trolley 23 on the lifting guide rail 22 (i.e., both the first guide wheel 2724 and the second guide wheel 2713 roll in contact with the lifting guide rail 22). When the desulfurization lance 25 is no longer needed to rotate and stir the molten iron, the fixed clamping roller mechanism 272 can be controlled to move away from the lifting guide rail 22, with only the elastic clamping roller mechanism 271 in elastic contact with the lifting guide rail 22. This prevents shaking or jittering of the lifting trolley 23 and the desulfurization lance 25, and allows the lifting trolley 23 to be moved up and down along the lifting guide rail 22 driven by the lifting device 24. The combination of elastic and fixed clamping of the clamping device 27 stabilizes the lifting trolley 23 in its working position while also providing a cushioning and vibration-reducing effect. At the same time, the control device can control the lifting trolley 23 to move up and down and change the rotation direction according to the dynamic conditions of molten iron desulfurization when the desulfurization lance 25 rotates and stirs (that is, the rotation drive device 26 can drive the desulfurization lance 25 to rotate clockwise or counterclockwise), fundamentally avoiding the dead zone phenomenon during desulfurization, improving the dynamic conditions of molten iron desulfurization and the uniformity and reaction ability of the desulfurizer in the molten iron, thereby fully improving the efficiency of molten iron desulfurization.

[0062] It should also be noted that the fixed clamping roller mechanism 272 may include an actuator 2721, a transmission mechanism 2722 connected to the actuator 2721, an eccentric pendulum 2723 connected to the transmission mechanism 2722, and a first guide wheel 2724 connected to the eccentric pendulum 2723. The first guide wheel 2724 is configured to roll in contact with the lifting guide rail 22. The actuator 2721 and the transmission mechanism 2722 are both disposed on the roller support 2711. The elastic clamping roller mechanism 271 may include an elastic member 2712 and a second guide wheel 2713. One end of the elastic member 2712 is perpendicularly disposed on the roller support 2711, and the other end of the elastic member 2712 is connected to the second guide wheel 2713. The second guide wheel 2713 rolls along one side of the lifting guide rail 22.

[0063] That is, the control device can control the operation of the actuator 2721, thereby driving the transmission mechanism 2722 to drive the eccentric pendulum 2723 to swing, and the eccentric pendulum 2723 swings to the first guide wheel 2724 to press against the lifting guide rail 22. When the rotary drive device 26 drives the desulfurization lance 25 to rotate and stir the molten iron, due to the large circumferential and radial forces acting on the lifting trolley 23, relying solely on the elastic clamping roller mechanism 271 to clamp the lifting guide rail 22 cannot prevent the lifting trolley 23 from shaking and trembling. Therefore, it is necessary to control the operation of the fixed clamping roller mechanism 272, thereby using the first guide wheel 2724 to press against the lifting guide rail 22 to prevent irregular shaking of the desulfurization lance 25 during rotation. When stirring of the molten iron is not required, the actuator 2721 can be controlled to operate in the reverse direction to move the first guide wheel 2724 away from the lifting guide rail 22, leaving only the second guide wheel 2713 pressing against the lifting guide rail 22, thereby preventing shaking and trembling of the lifting trolley 23 and the desulfurization lance 25.

[0064] In addition, it should be noted that the rotary drive device 26 includes a rotary motor, a rotary reducer 262 with a hollow output shaft, a stirring main shaft, an upper bearing support, a lower bearing support, an upper bearing group and a lower bearing group. The rotary motor is connected to the rotary reducer 262, and the rotary reducer 262 is connected to the stirring main shaft. The upper part of the stirring main shaft is provided with an upper bearing group and the lower part is provided with a lower bearing group. The upper bearing group is provided with a lifting trolley 23 through the upper bearing support, and the lower bearing group is provided with a lifting trolley 23 through the lower bearing support, and the stirring main shaft and the desulfurization spray gun 25 are coaxially connected to drive the desulfurization spray gun 25 to rotate and stir.

[0065] In one embodiment, two gun-changing devices 6 for replacing the desulfurization lances 25 are further included. The two gun-changing devices 6 are respectively located on either side of the main desulfurization equipment 2. The gun-changing devices 6 may include a gun-changing carriage 61 for loading the desulfurization lances 25 and running wheels 62 located at the bottom of the gun-changing carriage 61. The equipment platform 1 is provided with a running guide rail 11 for the running wheels 62 to move.

[0066] It should be noted that the gun changing device 6 has functions such as anti-tipping, automatic centering and rapid lifting, which can realize efficient gun changing. When the desulfurization spray gun 25 needs to be replaced, the pre-installed new desulfurization spray gun 25 is hoisted on any gun changing device 6 for standby, and the lifting device 24 drives the lifting trolley 23 to the gun changing position, and then drives the gun changing device 6 of another station to the gun changing position. The operator then disassembles the damaged desulfurization spray gun 25 and places it on the gun changing device 6, and the gun changing device 6 returns to its initial position. At the same time, drive the gun changing device 6 of another station to the gun changing position, install the desulfurization spray gun 25 of the gun changing device 6 on the desulfurization main equipment 2, and drive the gun changing device 6 back to its initial position to complete the gun changing operation. By using a backup gun changing device 6, the gun changing time can be reduced to less than 20 minutes.

[0067] In one embodiment, the lifting device 24 includes a lifting drive motor 241, a reducer 242, a hoist 243, a pulley group 244, a wire rope 245, and a tension detection device for detecting whether the wire rope 245 is evenly stressed or loose. The lifting drive motor 241 is connected to the reducer 242, and the reducer 242 is connected to the hoist 243; the lifting drive motor 241, the reducer 242, and the hoist 243 are all arranged above the main frame 21, and the fixed pulley of the pulley group 244 and the end support of the wire rope 245 are connected. The seats are located at the top of the main frame 21, and the movable pulley of the pulley assembly 244 is located within the lifting trolley 23 (this arrangement helps to reduce the overall structure of the device, improve the force uniformity and lateral force of the lifting trolley 23, increase the life of the lifting guide rail 22 and the lifting trolley 23, achieve uniform clamping, and reasonably reduce the overall height of the lifting trolley 23). One end of the wire rope 245 is wound around the hoist 243, and the other end of the wire rope 245 is connected to the movable pulley by passing through the fixed pulley. The lifting drive motor 241 and the tension detection device are both connected to the control device. The tension detection device is used to detect whether the wire rope 245 is evenly stressed or slack, thereby ensuring that each wire rope 245 is evenly stressed and preventing malfunction of the lifting device 24.

[0068] In one embodiment, the deslagging device 7 for removing slag from the desulphurization lance 25 and the cooling device for circulating cooling gas into the desulphurization lance 25 are further included, and the deslagging device 7 and the cooling device are both connected to the control device. Therefore, when slag appears on the outer peripheral wall of the desulphurization lance 25, the deslagging device 7 can be controlled to operate to perform a deslagging operation on the desulphurization lance 25. By designing the deslagging device 7, the present device avoids the problem that the center of gravity and the center of rotation of the desulphurization lance 25 are not coaxial due to severe slagging at the slag line position of the desulphurization lance 25, resulting in irregular vibration of the desulphurization lance 25, bending or even breaking of the desulphurization lance 25, thereby improving the life of the desulphurization lance 25.

[0069] Moreover, when performing the desulfurization operation, the control device can control the operation of the cooling device to circulate cooling gas into the desulfurization spray gun 25 to effectively cool the desulfurization spray gun 25. If the desulfurization spray gun 25 is not cooled, it is easy to cause the rigidity of the desulfurization spray gun 25 to weaken. After the rigidity weakens, the desulfurization spray gun 25 is easy to bend and deform when rotating, affecting the service life of the desulfurization spray gun 25.

[0070] In one embodiment, the slag removal device 7 includes a vertically arranged scraper 71 (with a slope at the end), a swing arm 72, a power unit 73 for driving the swing arm 72 to rotate, a transfer bracket 74 for connecting the scraper 71 and one end of the swing arm 72 (to facilitate replacement of the scraper 71), and a mounting bracket 75. The other end of the swing arm 72 is mounted on the power unit 73. The power unit 73 is mounted on the mounting bracket 75 in a manner that allows it to be raised and lowered by a guide rod and a limit bolt (so that the slag removal device 7 can be raised and lowered, and the limit bolt can prevent the power unit 73 from being separated from the mounting bracket 75). The mounting bracket 75 is mounted on the main frame 21. For example, the power unit 73 can be configured as a rotary motor to drive the swing arm 72 to achieve rotational swinging and slight lifting and lowering movements.

[0071] It should be noted that when the desulfurization lance 25 needs to be deslagging, first, the lifting device 24 is controlled to operate to lift the desulfurization lance 25 to the scraping position. When the desulfurization lance 25 reaches the scraping position, the fixed clamping roller mechanism 272 is controlled to operate to fix the position of the lifting trolley 23 and the desulfurization lance 25. Then, the rotary drive device 26 is controlled to operate to drive the desulfurization lance 25 to rotate. Subsequently, the power unit 73 is controlled to operate to drive the swing arm 72 to swing back and forth in the scraping area so that the scraper 71 contacts the surface of the slag body. When the desulfurization lance 25 rotates, the scraper 71 can perform the scraping operation, that is, the scraper 71 swings back and forth and repeatedly hits the slag body, repeatedly contacting different slag surfaces. In addition, during the scraping process, after the scraper 71 has scraped a certain place, the scraper 71 can be controlled to move up and down, or the scraper 71 can be controlled to move up and down synchronously during the scraping process to achieve effective removal of the slag body.

[0072] In one embodiment, the lifting trolley 23 includes a trolley frame and lifting guide wheels. The lifting guide wheels are symmetrically arranged at the upper and lower end positions of the trolley frame. The lifting guide wheels roll along the lifting guide rails 22, wherein the lifting guide wheels can be set as safety guide wheels.

[0073] In one embodiment, the composite blowing system 4 includes a composite desulfurizer silo 41 filled with desulfurizer, a first blowing-assisting pipe 42 connected to the discharge port of the composite desulfurizer silo 41, and a first nitrogen pipe 43 for introducing nitrogen. The first nitrogen pipe 43 is connected to the first blowing-assisting pipe 42, and the stirring main shaft of the rotary drive device 26 is connected to the first blowing-assisting pipe 42 through a rotary joint 261. The stirring main shaft and the desulfurization spray gun 25 are coaxially connected.

[0074] When the composite injection system 4 is injecting desulfurizer, the control device can control the operation of the cooling device (having an air inlet and outlet path to achieve the circulation of cooling gas) to circulate cooling gas into the desulfurization lance 25, effectively cooling the desulfurization lance 25. If the desulfurization lance 25 is not cooled, the rigidity of the desulfurization lance 25 will be weakened. When the rigidity is weakened, the desulfurization lance 25 will be easily bent and deformed during rotation, shortening the service life of the desulfurization lance 25. During the desulfurization process using the injection method, the desulfurizer passes through the composite desulfurizer silo 41, the first auxiliary blowing pipe 42, and then enters the stirring spindle, then enters the desulfurization lance 25, and finally enters the molten iron in the ladle 3 through the injection port at the bottom of the desulfurization lance 25.

[0075] In one embodiment, the KR feeding system 5 includes a KR desulfurizer silo 51 filled with desulfurizer, a second blowing-assisting pipe 52 connected to the discharge port of the KR desulfurizer silo 51, a second nitrogen pipe 53 for introducing nitrogen, a fixed chute 54, a movable chute 55 movably embedded in the fixed chute 54, and a transmission device for driving the movable chute 55 to move. The movable chute 55 rolls along the fixed chute 54 via a guide wheel 56. The second nitrogen pipe 53 is connected to the second blowing-assisting pipe 52, and the second blowing-assisting pipe 52 is connected to the fixed chute 54. When desulfurization by the KR method is required, the transmission device drives the movable chute 55 to descend along the inner wall of the fixed chute 54 via the guide wheel 56 to above the molten iron liquid level. After the desulfurizer feeding operation is completed, the transmission device drives the movable chute 55 to retreat to its initial position along the inner wall of the fixed chute 54 via the guide wheel 56.

[0076] This device can make the desulfurization lance 25 realize smooth upward or downward movement while rotating, blowing, and stirring according to the parameters such as the capacity, temperature, carbon content, desulfurization speed, and efficiency of the molten iron in the ladle 3 and the process requirements of desulfurization. Of course, the desulfurization lance 25 can also be controlled to stay at any height of the molten iron in the ladle 3 to rotate, blow, and stir. In addition, the rotary drive device 26 can control the desulfurization lance 25 to rotate forward or reverse, and the rotation speed can be adjusted between 0-180rpm (the rotary motor of the rotary drive device 26 can change the speed and direction). This device can give full play to the technical advantages of rotary stirring and spraying desulfurization, and solve the current problems of low desulfurization efficiency, insufficient power, dead zone and insufficient equipment functionality of high-viscosity vanadium and titanium molten iron. In addition to the above-mentioned multifunctional rotary desulfurization equipment, the present invention also provides a desulfurization method for the multifunctional rotary desulfurization equipment applied to any of the above items, such as Figure 8 As shown, the desulfurization method includes:

[0077] Step S1: After the desulfurization lance 25 is installed in place, the ladle 3 is moved below the desulfurization lance 25;

[0078] Step S2: The lifting device 24 drives the lifting trolley 23 to descend along the lifting guide rail 22, so that the desulfurization lance 25 is lowered to the upper surface of the molten iron in the ladle 3. At the same time, the cooling gas valve of the cooling device can be controlled to open so that the cooling gas enters the desulfurization lance 25 to cool the desulfurization lance 25;

[0079] Step S3: The rotary drive device 26 drives the desulfurization lance 25 to rotate, and selectively controls the composite injection system 4 to inject desulfurization agent into the desulfurization lance 25, or controls the KR feeding system 5 to add desulfurization agent to the upper surface of the molten iron;

[0080] Step S4: The lifting device 24 drives the lifting trolley 23 to descend along the lifting guide rail 22, so that the desulfurization lance 25 descends to the stirring position. At this time, the fixed clamping roller mechanism 272 is controlled to clamp the lifting guide rail 22, and the speed and direction of the rotary drive device 26 are set according to the parameter requirements of the molten iron;

[0081] Step S5: After the desulfurization operation of the ladle 3 is completed, the composite blowing system 4 or the KR feeding system 5 is controlled to stop running, the fixed clamping roller mechanism 272 is controlled to return to the initial position, and the lifting device 24 is controlled to drive the lifting trolley 23 to rise to the initial position along the lifting guide rail 22 to remove the ladle 3.

[0082] In one embodiment, the ladle 3 is removed, and then the process includes:

[0083] Determine whether the desulfurization spray gun 25 is damaged. If not, control the lifting device 24 to drive the lifting trolley 23 to move along the lifting guide rail 22 to the waiting position to prepare for the next desulfurization operation;

[0084] If so, the empty gun changing device 6 is controlled to move to the gun changing position to drop the damaged desulfurization lance 25 onto the gun changing device 6, the gun changing device 6 equipped with the damaged desulfurization lance 25 is controlled to leave the gun changing position, the gun changing device 6 equipped with the new gun is controlled to move to the gun changing position, the hydraulic cylinder of the gun changing device 6 is controlled to lift the new desulfurization lance 25, so that the new desulfurization lance 25 is installed into the driving end of the rotary drive device 26, the gun changing device 6 is controlled to leave the gun changing position, and after the desulfurization lance 25 is installed in place, the ladle 3 moves to under the desulfurization lance 25.

[0085] It should be noted that the first blowing-assisting tube 42 and the second blowing-assisting tube 52, the first nitrogen tube 43 and the second nitrogen tube 53, the first guide wheel 2724 and the second guide wheel 2713 mentioned in this application document, where the first and the second are only to distinguish the different positions, have no order of precedence.

[0086] In addition, it should be noted that the orientation or position relationship indicated by "upper" and "lower" in this application is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description and facilitating understanding, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0087] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by the present invention is within the scope of protection of this invention and will not be described in detail here.

[0088] The above is a detailed introduction to the multifunctional rotary desulfurization equipment and desulfurization method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A multifunctional rotary desulfurization equipment, characterized in that: include: Equipment platform (1); The desulfurization main equipment (2) comprises a main frame (21) arranged on the equipment platform (1), a lifting guide rail (22) arranged on the inner side of the main frame (21), a lifting trolley (23) that moves up and down along the lifting guide rail (22), a lifting device (24) for driving the lifting trolley (23) to move up and down, a desulfurization spray gun (25), a rotary drive device (26) for driving the desulfurization spray gun (25) to rotate, and a clamping device (27), wherein the rotary drive device (26) is arranged on the lifting trolley (23), and the driving end of the rotary drive device (26) passes through the lifting trolley (23) and is connected to the desulfurization spray gun (25), and the lifting trolley ( At least two groups of the clamping devices (27) are symmetrically provided on the outer side of the lifting trolley (23) along the circumferential direction, and the clamping devices (27) include a roller support (2711) vertically provided on the outer side of the lifting trolley (23), an elastic clamping roller mechanism (271) for elastically contacting the lifting guide rail (22), and a fixed clamping roller mechanism (272), the elastic clamping roller mechanism (271) and the fixed clamping roller mechanism (272) are both vertically provided on the roller support (2711), and the fixed clamping roller mechanism (272) is used to clamp or move away from the lifting guide rail (22), and the two clamping devices (27) in the same group are provided in pairs and are arranged in a mirrored manner with the lifting guide rail (22) as a symmetry plane; a ladle (3) containing molten iron; A composite injection system (4) for injecting the desulfurization agent into the desulfurization spray gun (25); A KR feeding system (5) for feeding the desulfurizing agent onto the surface of the ladle (3); The control device, the lifting device (24), the rotary drive device (26), the fixed clamping roller mechanism (272), the composite blowing system (4) and the KR feeding system (5) are all connected to the control device.

2. The multifunctional rotary desulfurization equipment according to claim 1, characterized in that: It also includes two gun-changing devices (6) for replacing the desulfurization spray gun (25), and the two gun-changing devices (6) are respectively arranged on both sides of the desulfurization main equipment (2).

3. The multifunctional rotary desulfurization equipment according to claim 2, characterized in that: The lifting device (24) includes a lifting drive motor (241), a speed reducer (242), a hoist (243), a pulley block (244), a steel wire rope (245), and a tension detection device for detecting whether the steel wire rope (245) is evenly stressed or slack. The lifting drive motor (241) is connected to the speed reducer (242), and the speed reducer (242) is connected to the hoist (243). The lifting drive motor (241), the speed reducer (242) and the hoist (243) are all arranged above the main frame (21); the fixed pulley of the pulley group (244) and the end support of the steel wire rope (245) are both arranged on the top of the main frame (21); the movable pulley of the pulley group (244) is arranged in the lifting trolley (23); one end of the steel wire rope (245) is wound around the hoist (243); the other end of the steel wire rope (245) is wound around the fixed pulley and connected to the movable pulley; the lifting drive motor (241) and the tension detection device are both connected to the control device.

4. The multifunctional rotary desulfurization equipment according to claim 2, characterized in that: It also includes a slag removal device (7) for removing slag from the desulfurization lance (25) and a cooling device for circulating cooling gas into the desulfurization lance (25), and the slag removal device (7) and the cooling device are both connected to the control device.

5. The multifunctional rotary desulfurization equipment according to claim 4, characterized in that: The slag removal device (7) comprises a vertically arranged scraper (71), a swing arm (72), a power unit (73) for driving the swing arm (72) to rotate, a transfer support (74) for connecting the scraper (71) and one end of the swing arm (72), and a mounting support (75), the other end of the swing arm (72) is sleeved on the power unit (73), the power unit (73) is arranged on the mounting support (75) in a manner that it can be raised and lowered by a guide rod and a limit bolt, and the mounting support (75) is arranged on the main frame (21).

6. The multifunctional rotary desulfurization equipment according to any one of claims 2 to 5, characterized in that: The lifting trolley (23) includes a trolley frame and lifting guide wheels (56). The lifting guide wheels (56) are symmetrically arranged at the upper and lower end positions of the trolley frame. The lifting guide wheels (56) roll along the lifting guide rail (22).

7. The multifunctional rotary desulfurization equipment according to any one of claims 2 to 5, characterized in that: The composite blowing system (4) includes a composite desulfurizer silo (41) filled with desulfurizer, a first auxiliary blowing pipe (42) connected to the discharge port of the composite desulfurizer silo (41), and a first nitrogen pipe (43) for introducing nitrogen, the first nitrogen pipe (43) and the first auxiliary blowing pipe (42) are connected, the stirring main shaft of the rotary drive device (26) is connected to the first auxiliary blowing pipe (42) through a rotary joint (261), and the stirring main shaft and the desulfurization spray gun (25) are coaxially connected.

8. The multifunctional rotary desulfurization equipment according to any one of claims 2 to 5, characterized in that: The KR feeding system (5) includes a KR desulfurizer silo (51) containing the desulfurizer, a second blow-assisting pipe (52) connected to the discharge port of the KR desulfurizer silo (51), a second nitrogen pipe (53) for introducing nitrogen, a fixed chute (54), a movable chute (55) movably embedded in the fixed chute (54), and a transmission device for driving the movable chute (55) to move, the movable chute (55) rolling along the fixed chute (54) through a guide wheel (56), the second nitrogen pipe (53) and the second blow-assisting pipe (52) are connected, and the second blow-assisting pipe (52) and the fixed chute (54) are connected.

9. A desulfurization method, applied to the multifunctional rotary desulfurization equipment according to any one of claims 2 to 8, characterized in that: include: After the desulfurization lance (25) is installed in place, the ladle (3) is moved below the desulfurization lance (25); The lifting device (24) drives the lifting trolley (23) to descend along the lifting guide rail (22), so that the desulfurization lance (25) is lowered to the upper surface of the molten iron in the ladle (3); The rotary drive device (26) drives the desulfurization lance (25) to rotate, and selectively controls the composite injection system (4) to inject the desulfurization agent into the desulfurization lance (25), or controls the KR feeding system (5) to add the desulfurization agent to the upper surface of the molten iron; The lifting device (24) drives the lifting trolley (23) to descend along the lifting guide rail (22), so that the desulfurization lance (25) descends to the stirring position. At this time, the fixed clamping roller mechanism (272) is controlled to clamp the lifting guide rail (22), and the speed and direction of the rotary drive device (26) are set according to the parameter requirements of the molten iron; After the desulfurization operation of the ladle (3) is completed, the composite blowing system (4) or the KR feeding system (5) is controlled to stop running, the fixed clamping roller mechanism (272) is controlled to return to the initial position, and the lifting device (24) is controlled to drive the lifting trolley (23) to rise to the initial position along the lifting guide rail (22) to remove the ladle (3).

10. The desulfurization method according to claim 9, characterized in that: The step of removing the ladle (3) then comprises: Determine whether the desulfurization spray gun (25) is damaged. If not, control the lifting device (24) to drive the lifting trolley (23) to move along the lifting guide rail (22) to a waiting position to prepare for the next desulfurization operation; If so, the empty gun-changing device (6) is controlled to move to the gun-changing position so that the damaged desulfurization lance (25) falls on the gun-changing device (6), the gun-changing device (6) equipped with the damaged desulfurization lance (25) is controlled to leave the gun-changing position, the gun-changing device (6) equipped with the new lance is controlled to move to the gun-changing position, the hydraulic cylinder of the gun-changing device (6) is controlled to lift the new desulfurization lance (25) so that the new desulfurization lance (25) is installed into the driving end of the rotary drive device (26), the gun-changing device (6) is controlled to leave the gun-changing position, and return to the desulfurization lance (25). After the desulfurization lance (25) is installed in place, the ladle (3) moves to the bottom of the desulfurization lance (25).

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