Flow control device for air quenching granulation of ferronickel slag

Abstract

The utility model relates to the technical field of air-quenching granulation, in particular to a flow control device for air-quenching granulation of ferronickel slag, which comprises a steel ladle body, a baffle component and a stopper adjusting mechanism, a cavity is formed in the steel ladle body, a flow guide pipe is arranged on one side of the bottom of the steel ladle body, a ladle cover is arranged on the top of the steel ladle body, a long nozzle is formed in the top of the side, away from the flow guide pipe, of the steel ladle body, a heat preservation layer is arranged on the outer side of the steel ladle body, and a composite refractory material furnace lining is arranged on the inner side of the steel ladle body. A heat supplementing electric wire is arranged at the bottom in the steel ladle body, and an emergency slag discharging opening is formed in the steel ladle body; the device is a metallurgical container for connecting a slag ladle and air-quenching granulation equipment in the air-quenching granulation process of the high-temperature molten liquid ferronickel slag, and has the main functions of storing the ferronickel slag, regulating and controlling the flow of the ferronickel slag, relieving the impact of the ferronickel slag, and ensuring that the high-temperature molten liquid ferronickel slag slowly flows out and forms a laminar stream, so that the continuous air-quenching granulation is conveniently realized.

Description

Technical Field

[0001] The utility model relates to the technical field of air quenching and granulation, in particular to a flow control device for air quenching and granulation of nickel-iron slag. Background Art

[0002] The rotary kiln combined with electric furnace process (RKEF) is used to smelt nickel-iron alloy. During the smelting process, a large amount of nickel-iron slag with a temperature of about 1600°C will be discharged. The water quenching method currently used to cool the slag will lead to a large amount of waste heat resources contained in the slag and consume a large amount of water resources. The use of dry waste heat recovery technology using air quenching to recycle waste heat resources can greatly reduce production energy consumption. The nickel-iron slag air quenching waste heat recovery system is mainly composed of nickel-iron slag buffer and flow control device, air quenching granulation device, particle accumulation bed and waste heat boiler and other units. In order to ensure the stable and continuous operation of the air quenching granulation process, a buffer and flow control device must be equipped to allow the periodically discharged nickel-iron slag to be injected into the buffer and flow control device, and then continuously flow from the buffer and flow control device into the air quenching granulation device.

[0003] Traditional continuous casting tundishes, as metallurgical reaction vessels, are primarily used to purify molten steel and improve the quality of cast ingots, and are not suitable for slag quenching and pelletizing systems. For example, a tundish with a top-spinning turbulence suppressor creates a rotating velocity field in the molten steel within the tundish's impact zone during steady-state pouring, start-up pouring, and ladle changes. This weakens the molten steel's reflux to the steel-slag interface, reduces turbulent kinetic energy, and prevents slag coiling and secondary oxidation of the molten steel, ultimately purifying the molten steel within the impact zone. However, this tundish struggles to store slag, regulate slag flow, mitigate slag impact, and form laminar streams, making it impossible to achieve continuous pelletizing of nickel-iron slag. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies in the prior art and proposes a flow control device for ferronickel slag air quenching and granulation, aiming to solve at least one of the problems raised in the above background technology.

[0005] The utility model provides a flow control device for quenching and granulating nickel-iron slag, comprising:

[0006] a steel ladle, wherein a chamber is provided inside the steel ladle, a draft tube is provided on one side of the bottom of the steel ladle, the draft tube is communicated with the interior of the steel ladle, an ultrasonic flowmeter is provided at the draft tube, a ladle cover is provided on the top of the steel ladle, and a closable opening communicated with the interior of the steel ladle is provided on the ladle cover; a long shroud is provided on the top of the steel ladle away from the draft tube, the bottom of the long shroud passes through the steel ladle and extends into the steel ladle, a side wall of the long shroud is fixedly connected to the top of the steel ladle, an insulation layer is provided on the outside of the steel ladle, a composite refractory lining is provided on the inside of the steel ladle, an ultrasonic liquid level sensor and a thermocouple are provided on the steel ladle, a heating wire is provided at the bottom of the steel ladle, and an emergency slag discharge port is provided on the side of the bottom of the steel ladle away from the draft tube;

[0007] a baffle assembly, the baffle assembly being disposed within the ladle;

[0008] A stopper rod adjustment mechanism, wherein the stopper rod adjustment mechanism is arranged at one end of the steel ladle close to the guide tube, the side wall of the stopper rod adjustment mechanism is fixedly connected to the side wall of the steel ladle, a stopper rod is fixedly connected to the stopper rod adjustment mechanism, the stopper rod is vertically arranged, the bottom of the stopper rod passes through the steel ladle and extends into the steel ladle, and the axial center line of the stopper rod coincides with the axial center line of the guide tube, the stopper rod adjustment mechanism can drive the stopper rod to move horizontally and vertically; a gas channel is provided in the stopper rod.

[0009] In some embodiments, the diversion pipe is a single-hole straight water pipe.

[0010] In some embodiments, a supplementary heat burner is provided on the cover, and the supplementary heat burner is arranged to be tilted downward.

[0011] In some embodiments, an additive addition port is provided at the top of the shroud.

[0012] In some embodiments, the insulation layer covers the entire outer surface of the steel ladle.

[0013] In some embodiments, the composite refractory lining covers the entire inner wall of the steel ladle.

[0014] In some embodiments, the ultrasonic liquid level sensor is arranged on the top of the steel ladle, the thermocouple is arranged on the side of the top of the steel ladle close to the ultrasonic liquid level sensor, the thermocouple detection end passes through the steel ladle and extends into the steel ladle, and two ultrasonic liquid level sensors and two thermocouples are each symmetrically arranged with the axis of the steel ladle as the axis.

[0015] In some embodiments, the heating wire is arranged at the bottom of the steel ladle near the guide tube, and the height of the bottom of the steel ladle near the guide tube is lower than that of the bottom of the steel ladle near the emergency slag discharge port.

[0016] In some embodiments, the baffle assembly comprises:

[0017] A retaining dam is provided in the steel ladle on a side close to the guide pipe, and the bottom of the retaining dam is fixedly connected to the bottom wall of the steel ladle;

[0018] A retaining wall, the retaining wall being arranged in the ladle body on one side close to the emergency slag discharge port, the top of the retaining wall being fixedly connected to the top wall of the ladle body;

[0019] A turbulence suppressor is arranged on the bottom wall of the steel ladle, and the top of the turbulence suppressor is arranged corresponding to the bottom of the long nozzle.

[0020] In some embodiments, the stopper rod adjustment mechanism comprises:

[0021] a first electric slide rail, wherein a mounting end of the first electric slide rail is fixedly connected to the side wall of the steel ladle, and the first electric slide rail is vertically arranged;

[0022] The second electric slide rail is arranged perpendicular to the first electric slide rail, the left end of the second electric slide rail is fixedly connected to the sliding end of the first electric slide rail, the first electric slide rail can drive the second electric slide rail to perform linear motion in the vertical direction, the sliding end of the second electric slide rail is fixedly connected to the top of the stopper rod, and the second electric slide rail can drive the stopper rod to perform linear motion in the horizontal direction.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the simultaneous provision of a turbulence suppressor, a stopper rod, a retaining wall, and a dam as a buffer and flow control device. The combined action of these mechanisms can reduce the flow velocity of the nickel-iron slag in the tundish, suppress liquid level fluctuations in the slag drop pipe area, prevent the formation of converging vortices, reduce the effect of large particle inclusions to prevent clogging of the slag outlet, and form a stable laminar flow stream from the buffer and flow control device at a lower speed. Numerical simulation and experimental verification show that the nickel-iron slag can form a stable laminar flow stream, which facilitates the subsequent smooth and continuous slag air quenching and granulation.

[0024] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0025] Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A front structural cross-sectional view of a flow control device for ferronickel slag air quenching and granulation provided by an embodiment of the present utility model;

[0028] Figure 2 A top view of a flow control device for ferronickel slag air quenching and granulation provided by an embodiment of the present utility model;

[0029] Figure 3 This is a partially enlarged view of the flow control device for wind quenching and granulation of nickel-iron slag provided in an embodiment of the present utility model.

[0030] Among them: 1. Steel ladle; 2. Draft tube; 3. Ladle cover; 4. Closable opening; 5. Long nozzle; 6. Insulation layer; 7. Composite refractory lining; 8. Ultrasonic liquid level sensor; 9. Thermocouple; 10. Supplementary heating wire; 11. Emergency slag discharge port; 12. Stopper rod; 13. Gas channel; 14. Supplementary heating burner; 15. Additive addition port; 16. Dam; 17. Retaining wall; 18. Turbulence suppressor; 19. First electric slide rail; 20. Second electric slide rail; 21. Ultrasonic flow meter. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do 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 this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] As mentioned in the background technology, the traditional continuous casting tundish is a metallurgical reaction vessel, mainly used to purify molten steel and improve the quality of the casting, and is not suitable for the slag air quenching granulation system. For example, a tundish with a top-rotating turbulence suppressor can cause the molten steel in the impact zone of the tundish to generate a rotating velocity field under its action during steady-state pouring, pouring and ladle changing, thereby weakening the intensity of the molten steel flowing back to the steel-slag interface, reducing turbulent kinetic energy, avoiding slag rolling and secondary oxidation of the molten steel, and achieving the purpose of purifying the molten steel in the impact zone. However, this tundish is difficult to store slag, regulate slag flow, slow down the impact of slag, and form laminar flow streams, and cannot achieve continuous granulation of nickel-iron slag.

[0036] To improve the above-mentioned problems, the present application proposes a flow control device for ferronickel slag air quenching and granulation, which is equipped with a turbulence suppressor, a stopper rod, a retaining wall and a dam buffer and flow control device. The combined action of these mechanisms can reduce the flow velocity of ferronickel slag in the tundish, suppress the liquid level fluctuation in the slag drop pipe area, prevent the generation of converging vortices, reduce the effect of large particle inclusions to prevent clogging of the slag outlet, and form a smooth laminar flow stream from the buffer and flow control device at a lower speed. Through numerical simulation and experimental verification, it is concluded that ferronickel slag can form a stable laminar flow stream, which is conducive to the subsequent smooth and continuous slag air quenching and granulation.

[0037] See Figure 1-3 As shown, a flow control device for wind quenching and granulating nickel-iron slag according to an embodiment of the present application includes:

[0038] A steel ladle 1 is provided with a chamber inside the steel ladle 1, a draft tube 2 is provided on one side of the bottom of the steel ladle 1, the draft tube 2 is communicated with the interior of the steel ladle 1, an ultrasonic flowmeter 21 is provided at the draft tube 2, a ladle cover 3 is provided on the top of the steel ladle 1, and a closable opening 4 communicated with the interior of the steel ladle 1 is provided on the ladle cover 3; a long shroud 5 is provided on the top of the steel ladle 1 away from the draft tube 2, the bottom of the long shroud 5 extends through the steel ladle 1 into the steel ladle 1, and the side wall of the long shroud 5 is fixedly connected to the top of the steel ladle 1, an insulation layer 6 is provided on the outside of the steel ladle 1, a composite refractory material lining 7 is provided on the inside of the steel ladle 1, an ultrasonic liquid level sensor 8 and a thermocouple 9 are provided on the steel ladle 1, a heating wire 10 is provided at the bottom of the steel ladle 1, and an emergency slag discharge port 11 is provided on the side of the bottom of the steel ladle 1 away from the draft tube 2;

[0039] A baffle assembly is provided in the steel ladle 1;

[0040] The stopper rod adjustment mechanism is arranged at one end of the steel ladle 1 near the guide tube 2. The side wall of the stopper rod adjustment mechanism is fixedly connected to the side wall of the steel ladle 1. A stopper rod 12 is fixedly connected to the stopper rod adjustment mechanism. The stopper rod 12 is vertically arranged. The bottom of the stopper rod 12 passes through the steel ladle 1 and extends into the steel ladle 1. The stopper rod 12 coincides with the axial center line of the guide tube 2. The stopper rod adjustment mechanism can drive the stopper rod 12 to move horizontally and vertically; a gas channel 13 is provided in the stopper rod 12.

[0041] In some specific embodiments, the flow guide pipe 2 is a single-hole straight water pipe.

[0042] It should be understood that there can be multiple guide pipes 2 in this device. In this application, it is preferred to set up two guide pipes 2. Setting up multiple guide pipes 2 can be suitable for when the flow rate of high-temperature molten liquid nickel-iron slag is large, thereby realizing a one-machine multi-flow structure.

[0043] In some specific embodiments, a supplementary heat burner 14 is provided on the cover 3, and the supplementary heat burner 14 is arranged to be tilted downward.

[0044] In some specific embodiments, an additive adding port 15 is provided at the top of the shroud 5 .

[0045] In some specific embodiments, the insulation layer 6 covers the entire outer surface of the steel ladle 1 .

[0046] In some specific embodiments, the composite refractory lining 7 covers the entire inner wall of the steel ladle 1 .

[0047] In some specific embodiments, the ultrasonic liquid level sensor 8 is arranged at the top of the steel ladle 1, and the thermocouple 9 is arranged at the top of the steel ladle 1 close to the side of the ultrasonic liquid level sensor 8. The detection end of the thermocouple 9 penetrates the steel ladle 1 and extends into the steel ladle 1. Two ultrasonic liquid level sensors 8 and two thermocouples 9 are each symmetrically arranged with the axis of the steel ladle 1 as the axis.

[0048] In some specific embodiments, the heating wire 10 is arranged at the bottom of the steel ladle 1 near the guide pipe 2, and the height of the bottom of the steel ladle 1 near the guide pipe 2 is lower than the bottom of the steel ladle 1 near the emergency slag discharge port 11.

[0049] In some specific embodiments, the baffle assembly includes:

[0050] The dam 16 is provided in the ladle 1 near the side of the flow guide pipe 2, and the bottom of the dam 16 is fixedly connected to the bottom wall of the ladle 1;

[0051] The retaining wall 17 is arranged in the ladle 1 near the emergency slag discharge port 11, and the top of the retaining wall 17 is fixedly connected to the top wall of the ladle 1;

[0052] The turbulence suppressor 18 is arranged on the bottom wall of the ladle 1 , and the top of the turbulence suppressor 18 is arranged corresponding to the bottom of the long nozzle 5 .

[0053] In some specific embodiments, the stopper rod adjustment mechanism includes:

[0054] A first electric slide rail 19, the mounting end of which is fixedly connected to the side wall of the steel ladle 1, and the first electric slide rail 19 is vertically arranged;

[0055] The second electric slide rail 20 is arranged perpendicular to the first electric slide rail 20. The left end of the second electric slide rail 20 is fixedly connected to the sliding end of the first electric slide rail 19. The first electric slide rail 19 can drive the second electric slide rail 20 to perform linear motion in the vertical direction. The sliding end of the second electric slide rail 20 is fixedly connected to the top of the stopper rod 12. The second electric slide rail 20 can drive the stopper rod 12 to perform linear motion in the horizontal direction.

[0056] It should be understood that after the fluid flows from the long water inlet 5 into the buffer and flow control device, the liquid level fluctuations are mainly concentrated in the inlet area near the turbulence suppressor 18 and the front end of the retaining wall 17, while the flow tends to be stable at the rear end of the retaining wall 17. The retaining wall 17 effectively prevents the generation of surface backflow and suppresses the transmission of surface fluctuations. In the area above the guide tube 2, the liquid level is relatively stable and has no fluctuations, and no converging vortex appears. The molten nickel-iron slag passes through the turbulence suppressor 18, the retaining wall 17, and the dam 16, and is adjusted by the flow control device including the plug rod 12 and the guide tube 2, and slowly flows out of the guide tube 2 and forms a laminar flow stream. The experimental results show that the average flow velocity at the guide tube 2 is 0.918 m / s, and the Reynolds number is 55.1.

[0057] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A flow control device for ferronickel slag air quenching granulation, characterized in that: include: a steel ladle, wherein a chamber is provided inside the steel ladle, a draft tube is provided on one side of the bottom of the steel ladle, the draft tube is communicated with the interior of the steel ladle, an ultrasonic flowmeter is provided at the draft tube, a ladle cover is provided on the top of the steel ladle, and a closable opening communicated with the interior of the steel ladle is provided on the ladle cover; a long shroud is provided on the top of the steel ladle away from the draft tube, the bottom of the long shroud passes through the steel ladle and extends into the steel ladle body, a side wall of the long shroud is fixedly connected to the top of the steel ladle, an insulation layer is provided on the outside of the steel ladle, a composite refractory material lining is provided on the inside of the steel ladle, an ultrasonic liquid level sensor and a thermocouple are provided on the steel ladle, a heating wire is provided at the bottom of the steel ladle, and an emergency slag discharge port is provided on the side of the bottom of the steel ladle away from the draft tube; a baffle assembly, the baffle assembly being disposed within the ladle; A stopper rod adjustment mechanism, wherein the stopper rod adjustment mechanism is arranged at one end of the steel ladle close to the guide tube, the side wall of the stopper rod adjustment mechanism is fixedly connected to the side wall of the steel ladle, a stopper rod is fixedly connected to the stopper rod adjustment mechanism, the stopper rod is vertically arranged, the bottom of the stopper rod passes through the steel ladle and extends into the steel ladle, and the axial center line of the stopper rod coincides with the axial center line of the guide tube, the stopper rod adjustment mechanism can drive the stopper rod to move horizontally and vertically; a gas channel is provided in the stopper rod.

2. A flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The diversion pipe is a single-hole straight-through water pipe, and two diversion pipes are provided.

3. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: A supplementary heat burner is provided on the package cover and is tilted downward.

4. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: An additive adding port is provided on the top of the long shroud.

5. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The thermal insulation layer covers the entire outer surface of the steel ladle.

6. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The composite refractory lining covers the entire inner wall of the steel ladle.

7. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The ultrasonic liquid level sensor is arranged on the top of the steel ladle, and the thermocouple is arranged on the side of the top of the steel ladle close to the ultrasonic liquid level sensor. The thermocouple detection end penetrates the steel ladle and extends into the steel ladle. Two ultrasonic liquid level sensors and two thermocouples are each symmetrically arranged with the axis of the steel ladle as the axis.

8. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The heating wire is arranged at the bottom of the steel ladle near the guide pipe, and the height of the bottom of the steel ladle near the guide pipe is lower than the bottom of the steel ladle near the emergency slag discharge port.

9. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The baffle assembly comprises: A retaining dam is provided in the steel ladle on a side close to the guide pipe, and the bottom of the retaining dam is fixedly connected to the bottom wall of the steel ladle; A retaining wall, the retaining wall being arranged in the ladle body on one side close to the emergency slag discharge port, the top of the retaining wall being fixedly connected to the top wall of the ladle body; A turbulence suppressor is arranged on the bottom wall of the steel ladle, and the top of the turbulence suppressor is arranged corresponding to the bottom of the long nozzle.

10. The flow control device for ferronickel slag air quenching granulation according to claim 1, characterized in that: The stopper rod adjustment mechanism comprises: a first electric slide rail, wherein a mounting end of the first electric slide rail is fixedly connected to the side wall of the steel ladle, and the first electric slide rail is vertically arranged; The second electric slide rail is arranged perpendicular to the first electric slide rail, the left end of the second electric slide rail is fixedly connected to the sliding end of the first electric slide rail, the first electric slide rail can drive the second electric slide rail to perform linear motion in the vertical direction, the sliding end of the second electric slide rail is fixedly connected to the top of the stopper rod, and the second electric slide rail can drive the stopper rod to perform linear motion in the horizontal direction.

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