Side blowing structure of a fuming furnace bath

Abstract

The utility model discloses a side -blowing structure of smelting furnace molten pool belongs to metallurgical side -blowing technical field, including mixing cavity, float ball and stop ball. Mixing cavity is connected with air pipe and material pipe. Float ball is hinged with mixing cavity and can cooperate with the output pipe mouth of air pipe. Stop ball is hinged with mixing cavity and can cooperate with the output pipe mouth of material pipe. Float ball forms fixed moving path through hinged design, when side -blowing normal operation, float ball keeps airflow circulation through the gravity of itself and separates air pipe, when reflux, the opening and closing of air pipe are controlled by the buoyancy of liquid slurry, prevent slurry and flow into air pipe. Stop ball utilizes the gravity and slurry pressure of itself and blocks material pipe when reflux through hinged design and forms fixed moving path. The side -blowing structure effectively avoids the reflux of molten pool slurry under the condition of not influencing the normal passage of air pipe and material pipe.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical side-blowing technology, specifically a side-blowing structure for the molten pool of a fuming furnace. Background Technology

[0002] Fuming furnaces are important pieces of equipment widely used in the non-ferrous metallurgical industry. They are mainly used to process smelting waste or low-grade materials containing valuable metals such as zinc, lead, and tin, achieving metal enrichment and recovery through a high-temperature reduction and volatilization process. Traditional fuming furnaces mostly employ top-blowing or bottom-blowing processes, blowing air, pulverized coal, or other reducing agents into the molten pool. This utilizes a gas-liquid-solid multiphase reaction to promote the reduction and volatilization of metal oxides, ultimately recovering the target metal in the form of flue gas.

[0003] In the top-blowing process, gas is injected vertically from the surface of the molten pool. However, the gas penetration depth is limited, resulting in insufficient reduction reaction at the bottom of the molten pool and reduced metal volatilization efficiency. While the bottom-blowing process can improve the stirring effect of the molten pool, the nozzles are susceptible to corrosion by high-temperature molten slag, leading to high equipment maintenance costs. In contrast, the side-blowing technology, as a novel method for strengthening the molten pool, is gradually gaining attention. It uses multi-layered spray guns arranged on the side wall of the furnace to inject gas or powdered fuel into the molten pool at high speed and at an angle, forming a swirling flow field to enhance mass and heat transfer.

[0004] Side-blown spray guns typically integrate ventilation and combustion pipes, with each channel independently controlled. They can be independently fed into the molten pool through nozzles within the mixing chamber or mixed before being fed into the molten pool, achieving precise adjustment of the gas-solid mixing ratio. Patent CN221571133U discloses a tuyer structure for an oxygen-enriched side-blown melting furnace. The reducing agent enters the mixing chamber through a reducing agent pipe, and the air in the air inlet chamber mixes with the reducing agent before entering the melting furnace through the nozzle. While this structure achieves precise control of the air-to-reducing agent ratio and mixing output, it lacks a backflow prevention structure, posing a risk that the liquid slurry in the molten pool may flow back into the air duct and reducing agent pipe. Utility Model Content

[0005] The purpose of this invention is to provide a side-blowing structure for the molten pool of a fuming furnace to solve the problems mentioned in the prior art.

[0006] A side-blowing structure for the molten pool of a fumigation furnace is provided, comprising:

[0007] The mixing chamber is connected to an air duct and a material pipe;

[0008] A float ball, which is hinged to the mixing chamber and can be fitted with the outlet of the air duct;

[0009] The ball is hinged to the mixing chamber and can be fitted with the output port of the feed pipe.

[0010] Furthermore, the mixing chamber is located between the air duct and the material pipe, with the side wall recessed inward to form an assembly cavity, and the float ball and the blocking ball are respectively hinged to the assembly cavity.

[0011] The recessed design of the mixing chamber wall provides articulated assembly space for the float and the plug, integrating the float and the plug together to avoid design redundancy and maximize the use of the mixing chamber space for airflow and material mixing.

[0012] Furthermore, the float contacts the side wall of the plug near the air duct.

[0013] The rotation axes of the float and the blocking ball are designed on the same hinge axis, which improves structural integration and avoids redundancy in the width of the side-blowing structure. During normal operation, the float, constrained by the blocking ball, is suspended on top of it, allowing the slurry to apply buoyancy to the float, avoiding the hinge point. This creates a large arm torque, driving the float to rotate rapidly upwards and block the duct.

[0014] Furthermore, the side wall of the ball blocker near the duct is recessed inward to form a receiving cavity, and the float ball can contact and cooperate with the receiving cavity.

[0015] The design of the containment cavity can significantly reduce the initial suspension height of the float when it is mounted on the blocking ball, thereby providing clearance space for the air outlet of the duct and ensuring that the airflow has sufficient circulation area.

[0016] Furthermore, the float is a hollow structure.

[0017] The hollow structure reduces the overall density of the float, ensuring that it can float in a liquid slurry environment when high-strength and corrosion-resistant materials are used on the outside of the float.

[0018] Furthermore, it also includes a feed rod that can penetrate the feed tube and extend into the mixing chamber, and the feed rod can contact the bottom surface of the ball.

[0019] The feed rod extends into the feed pipe to feed solid materials into the mixing chamber. During the insertion process, the feed rod can be guided by the arc-shaped surface of the plug ball to push the plug ball up and continue to go deeper. After the feed rod is removed, the plug ball will block the feed pipe again under the action of gravity.

[0020] Furthermore, the feed rod has a constricted portion that extends toward the receiving cavity and whose outer diameter gradually decreases.

[0021] When air is not required to be introduced into the duct, the material rod can be pushed further inward to extend the constricted part away from the contact surface with the blocking ball, and the blocking ball will contact the flared part. During this process, the float ball is driven to rotate further until it blocks the duct opening, preventing solid materials from flowing into the duct.

[0022] Furthermore, it also includes a nozzle that connects the molten pool to the mixing chamber.

[0023] The nozzle connects the mixing chamber and the molten pool, injecting the gas-solid mixture into the molten pool at high speed to create a swirling flow that enhances stirring. The nozzle also serves as a structural transition between the mixing chamber and the molten pool, preventing the mixing chamber from directly bearing the high temperature of the molten pool.

[0024] Furthermore, the inner diameter of the nozzle gradually decreases towards the molten pool.

[0025] The Venturi effect accelerates the jet velocity and enhances the penetration depth of the molten pool. In addition, the nozzle's constriction design ensures that the gas-solid mixture still has a sufficient jet velocity when the duct pressure decreases or the duct is closed, preventing backflow of the molten pool slurry.

[0026] Furthermore, the nozzle is provided with flanges that respectively mate with the side wall of the fumigation furnace and the side wall of the mixing chamber.

[0027] The flange connects the nozzle to the side wall of the fuming furnace, and the mixing chamber is detachably connected to the flange, making it easy to remove the entire mixing chamber for internal maintenance.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] The mixing chamber, serving as the junction of the air duct and the material pipe, facilitates the mixing of gas and solid materials, forming a gas-solid two-phase flow that is input into the molten pool. The float, with its hinged design, has a fixed movement path. During normal side-blowing operation, the float detaches from the air duct under its own weight, maintaining airflow. In case of backflow, the buoyancy of the liquid slurry controls the opening and closing of the air duct, preventing slurry from flowing into it. The blocking ball, also with its hinged design, has a fixed movement path. In case of backflow, the blocking ball uses its own weight and slurry pressure to block the material pipe. This side-blowing structure effectively prevents backflow of molten pool slurry without affecting the normal flow of the air duct and material pipe. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of the side-blowing structure provided by this utility model;

[0032] Figure 2 This is one of the usage state diagrams of the side-blowing structure provided by this utility model;

[0033] Figure 3 This is the second diagram showing the usage state of the side-blowing structure provided by this utility model.

[0034] In the diagram: 1. Mixing chamber; 11. Air duct; 12. Material pipe; 13. Assembly chamber; 2. Float ball; 3. Blocking ball; 31. Receiving chamber; 4. Material rod; 41. Narrowing section; 5. Nozzle; 51. Flange. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments provided by this utility model without inventive effort are within the scope of protection of this utility model.

[0036] Obviously, the accompanying drawings described below are merely some examples or embodiments of this utility model. Those skilled in the art can apply this utility model to other similar scenarios without any creative effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this utility model, any changes to the design, manufacturing, or production methods based on the disclosed technical content are merely conventional technical means and should not be construed as insufficient disclosure of this utility model.

[0037] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this utility model and are not intended to limit the subject matter of the claims.

[0038] Please see Figure 1-3 As shown, the side-blowing structure of the molten pool in the fuming furnace of this embodiment includes a mixing chamber 1, a float 2, and a blocking ball 3. The mixing chamber 1 is connected to an air duct 11 and a material pipe 12. The float 2 is hinged to the mixing chamber 1 and can cooperate with the output port of the air duct 11. The blocking ball 3 is hinged to the mixing chamber 1 and can cooperate with the output port of the material pipe 12.

[0039] The mixing chamber 1 serves as the junction of the air duct 11 and the material pipe 12, enabling the mixing of gas (such as air) and solid materials (such as pulverized coal or reducing agent) through the chamber space. After the airflow and material are mixed in the mixing chamber 1, a gas-solid two-phase flow is formed, which is then sprayed into the molten pool through the nozzle 5 to ensure uniform gas-solid mixing and provide a foundation for subsequent efficient reactions.

[0040] The float 2 forms a lever structure through a hinged design, using the buoyancy generated by changes in the molten pool level to control the opening and closing of the air duct 11. During normal operation, the air pressure pushes the float 2 away from the outlet of the air duct 11, maintaining unobstructed airflow. During backflow, the molten pool slurry enters the mixing chamber 1, and the float 2 is driven by buoyancy to rotate around the hinge point, covering the outlet of the air duct 11 and blocking the backflow path.

[0041] The blocking ball 3 controls the opening and closing of the outlet of the feed pipe 12 through the combined action of gravity, slurry pressure, and the stroke of the feed rod 4. During normal operation, the material passes through the feed rod 4 and enters the mixing chamber 1 after passing through the feed pipe 12. The blocking ball 3 forms a clearance channel by adhering to the feed rod 4 due to gravity. Alternatively, when no material needs to be introduced, the feed rod 4 exits from the mixing chamber 1, and the blocking ball 3 adheres to the outlet of the feed pipe 12 due to gravity, preventing air from flowing into the feed pipe 12. During backflow, the slurry pressure pushes the blocking ball 3 to adhere tightly to the outlet of the feed pipe 12, forming a seal.

[0042] The mixing chamber 1, located between the air duct 11 and the material pipe 12, has an inwardly recessed side wall forming an assembly chamber 13. The assembly chamber 13 serves as the mounting base for the hinge shafts of the float 2 and the blocking ball 3, thus restricting the movement trajectories of the float 2 and the blocking ball 3. The mixing chamber 1 is both a channel for gas-solid mixing and the core for controlling the movement of the float 2 and the blocking ball 3. The assembly chamber 13, as a functional extension area of ​​the mixing chamber 1, integrates the anti-backflow control mechanism (i.e., the float 2 and the blocking ball 3) with the mixing function, simplifying the system complexity.

[0043] In one embodiment, the hinge axes of both the float 2 and the blocking ball 3 are fixed within the assembly cavity 13, and their rotation axes are located on the same hinge axis to reduce the number of independent hinge points and constrain their movement trajectories to the same plane. The float 2 and the blocking ball 3 contact the sidewall near the air duct 11. Since there is no linkage between the float 2 and the feed pipe 12, this arrangement does not require additional space to be reserved for the float 2 to move towards the feed pipe 12, significantly compressing the lateral width of the side-blowing structure.

[0044] During normal operation, float 2 is suspended on plug 3. When the molten slurry flows counter-currently into mixing chamber 1, float 2 is immersed in the slurry. At this time, the point of buoyancy of float 2 is far away from the hinge axis, and the contact point between float 2 and plug 3 separates, creating a large torque that drives float 2 to rotate and float rapidly. Plug 3, driven by its own weight and slurry pressure, rotates and presses down around the same hinge axis, sealing the outlet of material pipe 12.

[0045] Float 2 has a hollow structure, which reduces its density, making it easier to be propelled by the buoyancy of the slurry. The lightweight design shortens the float 2's ascent time and improves its backflow prevention sensitivity. The hollow structure allows for the use of a high-density alloy shell, resisting high-temperature molten slag corrosion.

[0046] The feed rod 4, as an externally operable component, is inserted or withdrawn manually or automatically, directly acting on the plug ball 3 to forcibly regulate the opening and closing of the feed pipe 12 channel. Initially, the plug ball 3 hangs down under gravity, covering the outlet of the feed pipe 12, and the feed pipe 12 channel is closed. When the feed rod 4 is not inserted, the plug ball 3 is in contact with the outlet of the feed pipe 12, blocking material flow. The feed rod 4 is pushed from outside the feed pipe 12 towards the mixing chamber 1, with its end contacting the bottom surface of the plug ball 3. The bottom surface of the plug ball 3 is arc-shaped; during its advancement, the feed rod 4 slides along the arc surface of the plug ball 3, generating a force perpendicular to the arc surface, pushing the plug ball 3 to rotate and rise around the hinge axis. After the plug ball 3 rises, the outlet of the feed pipe 12 opens, and material is conveyed into the mixing chamber 1 through the feed pipe 12.

[0047] Furthermore, the feed rod 4 has a constricted section 41 extending towards the receiving cavity 31 with a gradually decreasing outer diameter. The constricted section 41 divides the feed rod 4 into a thin section, a reduced section, and a thick section. When the feed rod 4 is not fully advanced, the thin section at the front end of the feed rod 4 contacts the bottom surface of the blocking ball 3, forcing the blocking ball 3 to complete a small-angle rotation. The float ball 2, under the limiting structure of the blocking ball 3, simultaneously completes a small-angle rotation, allowing the air duct 11 to retain a certain opening for airflow. As the feed rod 4 advances, the blocking ball 3 gradually rotates towards the air duct 11 after passing through the reduced section. Until it engages with the thick section of the feed rod 4, the float ball 2, under the limiting structure of the blocking ball 3, simultaneously completes a large-angle rotation, completely sealing the air duct 11. At this point, air cannot enter the mixing chamber 1, and solid materials input into the mixing chamber 1 also cannot enter the air duct 11.

[0048] The side-blowing structure also includes a nozzle 5, which connects the molten pool to the receiving cavity 31. Air and solid materials are respectively introduced into the air duct 11 and the material pipe 12. After mixing in the mixing cavity 1, the mixture is sprayed into the molten pool through the nozzle 5. The inner diameter of the nozzle 5 gradually decreases towards the molten pool. As the gas-solid mixture passes through the converging section, the flow velocity increases, the kinetic energy is enhanced, and a high-speed jet is formed. The high-speed jet penetrates deep into the bottom of the molten pool, generating strong turbulence, promoting gas-liquid-solid multiphase reactions, and enhancing the reduction and volatilization of metal oxides. If the air pressure in the air duct 11 suddenly decreases, the converging structure of the nozzle 5 maintains the residual jet velocity, using the negative pressure generated by the Venturi effect to adsorb the gas-solid mixture and delay the slurry backflow.

[0049] Furthermore, the nozzle 5 is connected to the side wall of the fuming furnace and the side wall of the mixing chamber 1 via flange 51, and is fixed with bolts to achieve detachable assembly. During maintenance, the flange bolts can be removed to remove the side blowing pipe for cleaning and maintenance separately, without the need to disassemble the entire fuming furnace.

[0050] It should be noted that this utility model is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and function as the technical concept within the scope of this utility model are included within the technical scope of this utility model. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, are also included within the scope of this utility model without departing from the spirit of this utility model.

Claims

1. A side-blown configuration of a smelting furnace bath, characterized in that, include: The mixing chamber (1) is connected to the air duct (11) and the material pipe (12); A float (2) is hinged to the mixing chamber (1) and can be fitted with the output port of the air duct (11); The ball (3) is hinged to the mixing chamber (1) and can be matched with the output port of the feed pipe (12).

2. A side-blown configuration of a smelting furnace bath according to claim 1, characterized in that The mixing chamber (1) is located between the air duct (11) and the material pipe (12). The side wall is recessed inward to form an assembly chamber (13). The float (2) and the plug (3) are respectively hinged to the assembly chamber (13).

3. A side-blown configuration of a smelting furnace bath according to claim 2, characterized in that The float (2) contacts the side wall of the plug (3) near the air duct (11).

4. A side-blown configuration of a smelting furnace bath according to claim 3, characterized in that The side wall of the ball stopper (3) near the air duct (11) is recessed inward to form a receiving cavity (31), and the float ball (2) can contact and cooperate with the receiving cavity (31).

5. The side-blowing structure of the molten pool in a fumigation furnace according to claim 1, characterized in that, The float (2) is a hollow structure.

6. The side-blowing structure of the molten pool in a fumigation furnace according to claim 1, characterized in that, It also includes a feed rod (4), which can penetrate the feed tube (12) and extend to the mixing chamber (1), and the feed rod (4) can contact the bottom surface of the ball (3).

7. The side-blowing structure of the molten pool in a fuming furnace according to claim 6, characterized in that, The feed rod (4) has a constricted portion (41) that extends toward the receiving cavity (31) and whose outer diameter gradually decreases.

8. The side-blowing structure of the molten pool in a fuming furnace according to claim 1, characterized in that, It also includes a nozzle (5) that connects the molten pool to the mixing chamber (1).

9. The side-blowing structure of the molten pool in a fuming furnace according to claim 8, characterized in that, The inner diameter of the nozzle (5) gradually decreases towards the molten pool.

10. The side-blowing structure of the molten pool in a fuming furnace according to claim 8, characterized in that, The nozzle (5) is provided with flanges (51) that respectively cooperate with the side wall of the fuming furnace and the side wall of the mixing chamber (1).

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