Multi-channel gas-solid rotational flow injection feed preheating device for tin smelting

Abstract

The utility model discloses a multi-channel gas-solid rotational flow injection feeding preheating device for tin smelting. The device comprises a pulverized coal conveying pipeline, a dry powder conveying pipeline, a gas phase pipeline, a roasted product conveying pipeline, a pulverized coal storage tank, a dry powder storage tank, a roasted product storage tank and a multi-channel gas-solid two-phase spray gun, pulverized coal and dry powder are directly injected into the deep part of melt through a pulverized coal conveying pipeline and a dry powder conveying pipeline, and the smelting process is accelerated; injecting calcine, and rotationally dispersing and spraying the calcine at the outlet of the outermost channel above the melt through a calcine conveying pipeline, so that calcine particles are preheated above the molten pool and participate in chemical reaction in advance; oxygen-enriched air is injected, axial blowing kinetic energy is converted into tangential blowing kinetic energy through a multi-stage cyclone, and the stirring capacity of blowing gas to a molten pool is enhanced; through combination of numerical simulation and a multi-interpolation technology, parameter optimization is carried out on rotary injection of the roasted sand. The device improves the smelting efficiency, saves energy, reduces the smoke dust rate, and is convenient to popularize and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of tin metallurgy, and particularly relates to a multi-channel gas-solid cyclone injection feeding preheating device for tin smelting. Background Art

[0002] In traditional tin metallurgy, concentrated ore after roasting and desulfurization and dry powder collected from a fuming furnace and a top-blown furnace are often transported by vehicles and conveyed by belts, and finally poured into a molten bath from the top of the top-blown furnace. This method brings a series of problems: First, during transportation and conveyance, about 0.1% of the materials are consumed by dusting, reducing the direct metal recovery rate. At the same time, it brings serious low-altitude pollution and deteriorates the working environment. Second, since the distance between the top of the furnace and the free liquid surface of the molten bath is more than ten meters, a large number of material particles are carried by the gas flow in the furnace and finally discharged from the outlet in the form of flue gas, resulting in a reduction in the actual material entering the furnace and an increase in the dust content of the flue gas, exacerbating the downstream treatment difficulty and cost. Third, the materials entering the furnace by pouring freely in a free-fall manner from the furnace top often accumulate in a local area of the molten bath, and some materials cannot come into full contact with the high-temperature melt, increasing the time required for the material particles to melt. At the same time, the concentration of materials in a local area is also not conducive to their diffusion throughout the furnace, increasing the time for participating in chemical reactions and reducing the smelting efficiency.

[0003] Chinese Patent CN 202311364945.7 discloses an automatic injection device and method for adding granular sulfur for sulfuration and volatilization in a low-tin fuming furnace. Although it solves problems such as low sulfur utilization rate caused by sulfur volatilization or oxidation when sulfur falls during the traditional belt-type sulfur feeding process at the top of the fuming furnace, and solves manual intervention from control, realizes one-key operation, improves production efficiency, and achieves the purpose of energy conservation and consumption reduction. However, it reduces the direct metal recovery rate and at the same time brings serious low-altitude pollution and deteriorates the working environment.

[0004] Chinese Patent CN 202410082502.7 discloses a tin smelting method with bottom feeding including a top-blown lance. Although it reduces smelting energy consumption and flue gas emissions by avoiding adding moisture to fine-grained materials before entering the furnace, realizing a more environmentally friendly and energy-saving smelting process. However, the actual material entering the furnace is reduced and the dust content of the flue gas increases.

[0005] Chinese Patent CN 202310447300.3 discloses a smelting device and its smelting process for shortening the indium-tin smelting time, which can avoid the problem of long smelting time caused by uneven raw material distribution. However, the concentration of materials in a local area is also not conducive to their diffusion throughout the furnace, increasing the time for participating in chemical reactions.

[0006] In summary, the existing technologies have problems such as more material consumption, low direct metal recovery rate, high treatment difficulty and cost, and low smelting efficiency.

[0007] Therefore, how to provide a new type of multi-channel gas-solid swirl injection feeding preheating device for tin smelting that can reduce the soot rate and is conducive to energy conservation and emission reduction is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a multi-channel gas-solid swirl injection feeding preheating device for tin smelting, which simultaneously sprays three kinds of material particles, namely pulverized coal, dry powder and calcined ore, into the molten bath through pneumatic conveying, so as to solve the problems in the prior art that the material consumption is relatively large, the direct metal recovery rate is reduced, the processing difficulty and cost are increased, and the smelting efficiency is reduced.

[0009] In order to achieve the above object, the present invention adopts the following technical scheme: A multi-channel gas-solid swirl injection feeding preheating device for tin smelting, which includes:

[0010] A multi-channel gas-solid two-phase spray gun, a pulverized coal conveying pipeline, a dry powder conveying pipeline, a gas pipeline and a calcined ore conveying pipeline;

[0011] Among them, the multi-channel gas-solid two-phase spray gun is internally and externally layered with a plurality of pipeline channels. One end of the multi-channel gas-solid two-phase spray gun corresponding to the pipeline channel is the feeding end, and the other end is the discharging end;

[0012] The pulverized coal conveying pipeline, the dry powder conveying pipeline, the gas pipeline and the calcined ore conveying pipeline are sequentially connected to the feeding end of the multi-channel gas-solid two-phase spray gun, and the ends of the pulverized coal conveying pipeline, the dry powder conveying pipeline, the gas pipeline and the calcined ore conveying pipeline are all connected with an air compressor to provide pumping pressure;

[0013] A pulverized coal storage tank providing a pulverized coal source is connected to the pulverized coal conveying pipeline, a dry powder storage tank providing a dry powder source is connected to the dry powder conveying pipeline, and a calcined ore storage tank providing a calcined ore source is connected to the calcined ore conveying pipeline.

[0014] The beneficial effects of the present invention are as follows: The pulverized coal storage tank, the dry powder storage tank and the calcined ore storage tank are used to provide pulverized coal, dry powder and calcined ore respectively, and the materials are fed under the action of an air compressor. The gas pipeline provides high-speed air flow through the air compressor. The air flow and the materials are finally sent into the molten bath through the multi-channel gas-solid two-phase spray gun. The gas-solid two-phase refers to the gas phase and the solid phase. Feeding through the multi-channel gas-solid two-phase spray gun can avoid material consumption during the conveying process, improve the direct metal recovery rate, reduce the subsequent processing difficulty and cost, and improve the smelting efficiency. In addition, the present invention simultaneously sprays three kinds of material / fuel particles, namely pulverized coal, dry powder and calcined ore, into the molten bath through pneumatic conveying, effectively inhibits the splash of the melt, reduces the soot rate, and is conducive to energy conservation and emission reduction.

[0015] Preferably, the feeding end of the multi-channel gas-solid two-phase spray gun is hierarchically provided with a pulverized coal feeding port, a dry powder feeding port, a gas-phase interface, and a calcined ore feeding port from inside to outside in sequence. The pulverized coal feeding port is communicated with the pulverized coal conveying pipeline, the dry powder feeding port is communicated with the dry powder conveying pipeline, the gas-phase interface is connected with the gas pipeline, and the calcined ore feeding port is communicated with the calcined ore conveying pipeline; the pipeline channels of the multi-channel gas-solid two-phase spray gun are, from the inner layer to the outer layer, a pulverized coal channel, a dry powder channel, an oxygen-enriched air channel, and a calcined ore channel in sequence. The discharging end of the multi-channel gas-solid two-phase spray gun is, from the inner layer to the outer layer, a pulverized coal discharging port, a dry powder discharging port, an air flow outlet, and a calcined ore discharging port in sequence. There is a height difference of 1.5 m to 2.5 m between the calcined ore discharging port and the pulverized coal discharging port, the dry powder discharging port, and the air flow outlet.

[0016] The resulting technical effect is that the multi-channel gas-solid two-phase spray gun is provided with a pulverized coal channel, a dry powder channel, an oxygen-enriched air channel, and a calcined ore channel from the inner layer to the outer layer in sequence. The pulverized coal channel is used to convey pulverized coal, the dry powder channel is used to convey dry powder, the oxygen-enriched air channel is used to provide high-speed air flow, and the calcined ore channel is used to convey calcined ore. Specifically, the material conveying is carried out by using an air compressor installed upstream to generate high-pressure and high-speed air flow to push the materials into the respective channels of the spray gun. The calcined ore outlet is not arranged flush with other material outlets, which provides conditions for the feeding of calcined ore.

[0017] Preferably, a calcined ore channel cyclone is provided near the calcined ore discharging port of the multi-channel gas-solid two-phase spray gun. The calcined ore channel cyclone has a spiral channel and changes the discharging direction of the calcined ore, so that the calcined ore generates a spiral movement track. After passing through the calcined ore cyclone, the calcined ore is ejected from the calcined ore discharging port, and the calcined ore discharging port is provided with a reduced opening.

[0018] The resulting technical effect is that the calcined ore channel cyclone is used to change the movement track of the calcined ore. By generating a spiral movement track of the calcined ore through the calcined ore channel cyclone, the residence time is increased, and more particles are promoted to be preheated and melted before reaching the molten bath, realizing the preheating of the calcined ore. In addition, the reduced opening of the calcined ore discharging port is used to accelerate the air flow. Since the calcined ore discharging port is at a relatively high distance from the free liquid surface of the melt, secondary combustion of carbon monoxide will occur at this height, and the temperature can reach 1350 °C, which is higher than the melting point of the calcined ore particles. Therefore, the calcined ore will be preheated during the falling process, and some of the calcined ore particles will melt and participate in chemical reactions in advance during the falling process.

[0019] Preferably, a plurality of oxygen-enriched air channel cyclones are arranged at intervals in the oxygen-enriched air channel corresponding to the gas conveying direction. The oxygen-enriched air channel cyclones are used to change the gas flow direction in the oxygen-enriched air channel and generate a swirl.

[0020] The resulting technical effects are as follows: By using multiple oxygen-enriched air channel swirlers to change the flow direction of the high-speed air flow from axial to tangential, and redistributing the proportion of axial kinetic energy and circumferential kinetic energy through the oxygen-enriched air channel swirlers, the stirring ability is enhanced while avoiding a large amount of melt splashing caused by the high-speed air flow impacting the melt vertically.

[0021] Preferably, the spiral channel angles of the multiple oxygen-enriched air channel swirlers are different and the spiral angles corresponding to the air flow outlet directions increase step by step.

[0022] The resulting technical effects are as follows: The angle of the downstream swirlers gradually increases, which is used to generate a stronger swirl, enhance the stirring ability of the melt, and avoid material splashing.

[0023] Preferably, a dry powder channel swirler is provided near the dry powder discharge port of the dry powder channel. The dry powder channel swirler is used to increase the circumferential and radial velocities of the dry powder particles and generate a spiral dry powder blowing trajectory.

[0024] The resulting technical effects are as follows: The dry powder swirler is located at the dry powder discharge port, which is used to increase the circumferential and radial velocities of the dry powder particles, generate a spiral blowing trajectory, and increase the preheating time.

[0025] Preferably, valves for controlling the material flow rate are connected to the outlet pipelines corresponding to the pulverized coal storage tank, the dry powder storage tank, and the calcine storage tank. The pulverized coal storage tank, the dry powder storage tank, and the calcine storage tank are communicated with the pulverized coal pipeline, the dry powder pipeline, and the calcine pipeline through the corresponding outlet pipelines.

[0026] The resulting technical effects are as follows: The pulverized coal storage tank, the dry powder storage tank, and the calcine storage tank are used to provide the corresponding materials, and the valves on the outlet pipelines are used to control the discharge amount, so as to meet the working requirements.

[0027] The present utility model also discloses a multi-channel gas-solid swirl injection feeding preheating method for tin smelting, which uses the above preheating device and includes the following steps:

[0028] Step 1: Preliminary preparation. First, inject pulverized coal, dry powder, and calcine into the corresponding storage tanks. Install the multi-channel gas-solid two-phase spray gun in the middle position of the molten pool. The pulverized coal discharge port, the dry powder discharge port, and the air flow outlet of the multi-channel gas-solid two-phase spray gun are located below the molten liquid level, and the calcine discharge port of the multi-channel gas-solid two-phase spray gun is located above the molten liquid level.

[0029] Step 2: Start feeding. Under the pumping pressure of the air compressor, through the pulverized coal conveying pipeline and the dry powder conveying pipeline, the pulverized coal and the dry powder are injected into the melt interior through a multi-channel gas-solid two-phase spray gun to accelerate the smelting process. The pulverized coal directly enters the melt and burns, and the dry powder spirally enters the melt through the dry powder channel cyclone. The high-speed air flow in the oxygen-enriched air channel generates tangential kinetic energy through the oxygen-enriched air channel cyclone and stirs the melt.

[0030] Step 3: Inject calcined ore. Through the calcined ore conveying pipeline, at the outlet of the outermost layer channel of the spray gun above the melt, the calcined ore is sprayed into the molten pool; the calcined ore discharge port is located above the melt level. Due to the secondary combustion of carbon monoxide, some of the calcined ore particles will melt during the falling process; under the action of the calcined ore channel cyclone, part of the axial kinetic energy of the gas phase is converted into tangential, and the residence time of the calcined ore particles above the melt is extended to realize the preheating process of the melt.

[0031] The beneficial effects of the present utility model are as follows: Through pneumatic conveying, three kinds of materials / fuel particles, namely pulverized coal, dry powder and calcined ore, are simultaneously sprayed into the molten pool, effectively suppressing the splashing of the melt, reducing the dust rate, and being beneficial to energy conservation and emission reduction. Specifically, the pulverized coal conveying pipeline directly injects the pulverized coal into the melt interior through the central channel to accelerate smelting; the dry powder conveying channel increases the circumferential speed and radial speed of the dry powder particles through the dry powder channel cyclone, generating a spiral spraying trajectory, promoting its dispersion in the radial direction and avoiding local accumulation; the oxygen-enriched air redistributes the ratio of the spraying axial kinetic energy and tangential kinetic energy through the multi-stage oxygen-enriched air channel cyclone, and uses the high-speed fluid to fully stir the melt, while effectively reducing the splashing of the melt. The calcined ore material sprayed from the outlet of the outermost calcined ore channel is evenly sprayed into the melt during the rotating and falling process, thereby reducing the amount of dust generated by the calcined ore particles being carried by the air flow and reducing the dust rate; in addition, the calcined ore is continuously and evenly sprayed into the melt, reducing the time required for the melting and mass transfer of the material particles, accelerating the chemical reaction, and improving the smelting efficiency; the swirl generated by the outermost calcined ore cyclone increases the suspension time of the calcined ore, fully heats the calcined ore above the furnace hearth, improves the smelting efficiency, effectively utilizes the energy of the secondary combustion above the melt, reduces the outlet dust temperature, and increases the energy utilization rate, achieving energy conservation and emission reduction.

[0032] Preferably, it also includes a method for designing, matching and optimizing the spraying parameters. Among them, the spraying parameters and the structural parameters of the multi-channel gas-solid two-phase spray gun are input, and the measurement indexes of the particle dispersion degree and the dust rate are input; the spraying parameters include the air supply volume, air pressure and concentrate particle feeding rate of the calcined ore channel; the structural parameters include the number of stages, cyclone angle, cyclone height, calcined ore channel length and outlet inclination angle of the oxygen-enriched air channel cyclone.

[0033] Through the computational fluid dynamics CFD computer simulation technology, different working conditions are analyzed, and the output parameters are the particle dispersion degree and the dust rate. The output parameters are used as measurement indexes to evaluate the spraying effect.

[0034] Based on establishing a database of output parameters and measurement indicators, the multiple imputation technique is adopted to obtain the combination of the best injection parameters and structural parameters;

[0035] Among them, the computational fluid dynamics (CFD) computer simulation technology includes:

[0036] The volume of fluid (VOF) method is used to simulate the gas-liquid interface and the morphology of the impact pit, capture the interface position of the gas-liquid two-phase, and accurately describe the morphology of the impact pit;

[0037] Obtain the common momentum equation and continuity equation of the continuous phase to describe the motion behavior of the fluid; at the same time, add a turbulence model to simulate the turbulence phenomenon in the fluid to describe the motion and flow properties of the fluid;

[0038] The motion of particles is solved using Newton's second law to describe the motion behavior of particles in the fluid; by considering the mass, acceleration, and acting forces of the particles, the force conditions of the particles in the fluid are described; the particle-particle collision force Fcol is calculated by normal and tangential decomposition, and the normal and tangential components are obtained through decomposition calculation to accurately describe the interaction between particles.

[0039] The resulting technical effect is that these steps in the CFD computer simulation technology can achieve accurate simulation and analysis of complex fluid mechanics phenomena, provide important reference basis for engineering design and optimization, and help improve engineering efficiency and save resources.

[0040] Preferably, the process of using the multiple imputation technique to obtain the combination of the best injection parameters and structural parameters includes:

[0041] Understand the data set and the missing pattern. For the data set of the injection system, understand the missing situation and distribution pattern of the injection parameters and structural parameters; group the injection parameters and structural parameters separately, and select the imputation method according to their types;

[0042] After multiple iterations, perform a convergence judgment on the imputation results. Judge whether the imputation converges according to the relationship between variables before and after imputation or the goodness of fit of the model; if the imputation results have converged, stop the iteration; otherwise, continue the iteration until convergence;

[0043] Generate multiple complete data sets: According to the imputation results of multiple iterations, generate multiple complete data sets, which are used for subsequent analysis or modeling to obtain the combination of the best injection parameters and structural parameters; use the average method or model fusion method to integrate the results of multiple data sets.

[0044] The resulting technical effects are as follows: By the above method, the optimal combination of injection parameters and lance structure parameters can be determined to achieve the best injection effect. It realizes better particle dispersion and reduces the soot rate, improves production efficiency and product quality, while reducing energy consumption and environmental pollution; it is of great significance for the optimization and improvement of the industrial production process. Description of the Drawings

[0045] Figure 1 It is the overall structure diagram of a multi-channel gas-solid swirl injection feeding preheating device for tin smelting according to the present utility model;

[0046] Figure 2 It is the enlarged schematic view at A of a multi-channel gas-solid swirl injection feeding preheating device for tin smelting according to the present utility model;

[0047] Figure 3 It is the enlarged schematic view at B of a multi-channel gas-solid swirl injection feeding preheating device for tin smelting according to the present utility model;

[0048] Figure 4 It is the structure diagram of a multi-channel gas-solid two-phase lance of a multi-channel gas-solid swirl injection feeding preheating device for tin smelting according to the present utility model;

[0049] Figure 5 is Figure 4 the enlarged schematic view at C;

[0050] Figure 6 is Figure 4 the enlarged schematic view at D;

[0051] Figure 7 It is the schematic diagram of the principle of the injection parameter design matching and optimization method of a multi-channel gas-solid swirl injection feeding preheating method for tin smelting according to the present utility model.

[0052] 1 Air compressor, 2 Pulverized coal conveying pipeline, 3 Dry powder conveying pipeline, 4 Gas phase pipeline, 5 Roasted ore conveying pipeline, 6 Pulverized coal storage tank, 7 Dry powder storage tank, 8 Roasted ore storage tank, 9 Multi-channel gas-solid two-phase lance, 10 Melt, 11 Roasted ore, 12 Pulverized coal, 13 Dry powder, 14 Pulverized coal channel, 15 Dry powder channel, 16 Oxygen-enriched air channel, 17 Roasted ore channel, 18 Roasted ore channel cyclone, 19 Pulverized coal feed port, 20 Dry powder feed port, 21 Gas phase interface, 22 Roasted ore feed port, 23 Oxygen-enriched air channel cyclone, 24 Dry powder channel cyclone. Detailed Embodiments

[0053] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] It should be noted that the core of the structure of the cyclone mentioned in this article is the spiral channel that changes the flow direction of the material.

[0055] Refer to the attached drawings of the present utility model Figures 1 to 7 , according to an embodiment of the present utility model, a multi-channel gas-solid cyclone injection feeding preheating device for tin smelting includes:

[0056] A multi-channel gas-solid two-phase spray gun 9, a pulverized coal conveying pipeline 2, a dry powder conveying pipeline 3, a gas-phase pipeline 4, and a calcined ore conveying pipeline 5;

[0057] Among them, the multi-channel gas-solid two-phase spray gun 9 is internally and externally stratified with a plurality of pipeline channels, a total of four layers of channels. One end of the multi-channel gas-solid two-phase spray gun 9 corresponding to the pipeline channel is the feeding end, and the other end is the discharging end;

[0058] The pulverized coal conveying pipeline 2, the dry powder conveying pipeline 3, the gas-phase pipeline 4, and the calcined ore conveying pipeline 5 are sequentially connected to the feeding end of the multi-channel gas-solid two-phase spray gun 9, and the ends of the pulverized coal conveying pipeline 2, the dry powder conveying pipeline 3, the gas-phase pipeline 4, and the calcined ore conveying pipeline 5 are all connected to an air compressor 1 to provide pumping pressure;

[0059] A pulverized coal storage tank 6 providing a pulverized coal source is connected to the pulverized coal conveying pipeline 2, a dry powder storage tank 7 providing a dry powder source is connected to the dry powder conveying pipeline 3, and a calcined ore storage tank 8 providing a calcined ore source is connected to the calcined ore conveying pipeline 5. The storage tanks are all inverted to facilitate feeding.

[0060] In some other embodiments, the feeding end of the multi-channel gas-solid two-phase spray gun 9 is sequentially provided with a pulverized coal feeding port 19, a dry powder feeding port 20, a gas-phase interface 21, and a calcined ore feeding port 22 from the inside to the outside. The pulverized coal feeding port 19 is communicated with the pulverized coal conveying pipeline 2, the dry powder feeding port 20 is communicated with the dry powder conveying pipeline 3, the gas-phase interface 21 is connected to the gas-phase pipeline 4, and the calcined ore feeding port 22 is communicated with the calcined ore conveying pipeline 5; the pipeline channels of the multi-channel gas-solid two-phase spray gun 9 are sequentially a pulverized coal channel 14 (central channel), a dry powder channel 15, an oxygen-enriched air channel 16, and a calcined ore channel 17 (the outermost channel) from the inner layer to the outer layer. The discharging end of the multi-channel gas-solid two-phase spray gun 9 is sequentially a pulverized coal discharging port, a dry powder discharging port, an air flow outlet, and a calcined ore discharging port from the inner layer to the outer layer. There is a height difference of 2.1 m between the calcined ore discharging port and the pulverized coal discharging port, the dry powder discharging port, and the air flow outlet.

[0061] The central pulverized coal passage 14 is used to convey pulverized coal. There is no cyclone designed, and it directly blows the pulverized coal into the interior of the melt. While burning and releasing heat to provide energy to maintain the high-temperature state of the furnace, it generates a reducing atmosphere to promote the reduction smelting of crude tin.

[0062] In some other embodiments, a calcine passage cyclone 18 is provided near the calcine discharge port of the multi-channel gas-solid two-phase spray gun 9. The calcine passage cyclone 18 has a spiral passage and changes the discharge direction of the calcine, causing the calcine 11 to have a spiral movement trajectory. After passing through the calcine cyclone 18, the calcine is ejected from the calcine discharge port, and the calcine discharge port is provided with a reduced opening.

[0063] The calcine passage cyclone 18 has two functions. One is to make the calcine particles rotate and fall into the melt 10, avoiding the local accumulation of calcine particles and increasing the material uniformity at the source. The other is that the calcine passage cyclone 18 converts the axial kinetic energy of the gas phase into the tangential direction, reducing the axial velocity of the particles and increasing the tangential velocity, generating a spiral material movement trajectory, increasing the residence time, promoting more particles to be preheated and melted before reaching the melt 10 and participating in chemical reactions in the reducing atmosphere in advance, and accelerating the smelting process. At the same time, the heat absorption of particle melting increases the fuel energy utilization rate and reduces the flue gas temperature, which is beneficial to energy conservation and emission reduction.

[0064] Under the action of the calcine passage cyclone 18, the calcine is evenly sprayed into the melt 10, effectively avoiding the calcine particles being carried away by the gas flow, thereby reducing the dust rate. In addition, the continuous and uniform spraying of particles into the melt 10 can reduce the time required for the melting and mass transfer of the material particles, accelerate the chemical reaction, and improve the smelting efficiency.

[0065] In some other specific embodiments, a plurality of oxygen-enriched air passage cyclones 23 are provided at intervals in the oxygen-enriched air passage 16 corresponding to the gas transmission direction. The oxygen-enriched air passage cyclones 23 are used to change the gas flow direction in the oxygen-enriched air passage and generate a swirl. The plurality of oxygen-enriched air passage cyclones can redistribute the proportion of axial kinetic energy and circumferential kinetic energy, strengthening the stirring ability while avoiding a large amount of melt splashing caused by the vertical impact of the high-speed gas flow on the melt.

[0066] In some other embodiments, the spiral channel angles of the plurality of oxygen-enriched air passage cyclones 23 are different and the spiral angles corresponding to the gas outlet direction increase step by step.

[0067] In some other specific embodiments, a dry powder passage cyclone 24 is provided near the dry powder discharge port of the dry powder passage 15. The dry powder passage cyclone 24 is used to increase the circumferential and radial velocities of the dry powder particles and generate a spiral dry powder spraying trajectory, promoting its dispersion in the radial direction and avoiding local accumulation.

[0068] In addition, valves for controlling the material flow rate are connected to the outlet pipelines corresponding to the pulverized coal storage tank 6, the dry powder storage tank 7, and the calcined ore storage tank 8. The pulverized coal storage tank 6, the dry powder storage tank 7, and the calcined ore storage tank 8 are communicated with the pulverized coal conveying pipeline 2, the dry powder conveying pipeline 3, and the calcined ore conveying pipeline 5 through the corresponding outlet pipelines.

[0069] Preheating and melting occur before reaching the molten bath and participating in chemical reactions in advance in a reducing atmosphere, accelerating the smelting process.

[0070] The utility model can improve the efficiency and product quality of tin smelting. The smelting efficiency can be improved by preheating the calcined ore. At the same time, the temperature of the outlet flue dust can be reduced, increasing the energy utilization rate. In addition, the design of the multi-channel gas-solid two-phase spray gun can realize the closed input of materials, improve the working environment, and increase the direct recovery rate of metals.

[0071] The utility model also discloses a multi-channel gas-solid swirl injection feeding preheating method for tin smelting, which uses the above-mentioned preheating device and includes the following steps:

[0072] Step S1: The air compressor operates, and the pulverized coal, dry powder, and calcined ore are respectively stored in the corresponding storage tanks; the pulverized coal and dry powder are injected. Through the pulverized coal conveying pipeline and the dry powder conveying pipeline, the pulverized coal and dry powder are directly injected into the interior of the melt to accelerate the smelting process;

[0073] Step S2: The calcined ore is injected. Through the calcined ore conveying pipeline, at the outlet of the outermost channel of the spray gun above the melt, the calcined ore is sprayed into the molten bath;

[0074] Step S3: The multi-channel gas-solid two-phase spray gun works, and the multi-channel gas-solid two-phase spray gun is placed in the middle position of the melt; the axial kinetic energy of the injection is converted into tangential by the multi-stage cyclone to stir the molten bath.

[0075] In step S1 of this embodiment, the smelting process is accelerated by injecting the pulverized coal and dry powder. The pulverized coal and dry powder are directly injected into the deep part of the melt, which can increase the contact area between the gas-liquid-solid phases, improve the combustion efficiency and smelting efficiency, speed up the smelting speed, and improve the production efficiency.

[0076] In step S2, the calcined ore is injected through the outermost channel of the spray gun. The outermost channel is the calcined ore channel. The calcined ore passes through the cyclone of the calcined ore channel, generating a circumferential velocity and a spiral material movement trajectory, increasing the residence time, promoting more particles to preheat and melt before reaching the molten bath and participating in chemical reactions in advance in a reducing atmosphere, accelerating the smelting process.

[0077] In step S3, the operation of the multi-channel gas-solid two-phase spray gun can convert part of the axial kinetic energy of the injection into tangential direction through a multi-stage cyclone to stir the molten bath, increase the mixing degree inside the molten bath, and promote the improvement of mass transfer and reaction rate. At the same time, the setting of the cyclone can also generate a larger impact pit and avoid a large amount of molten metal splashing caused by the vertical impact of the high-speed gas flow on the melt.

[0078] The utility model accelerates the smelting process through the injection of pulverized coal and dry powder, realizes the preheating of calcine through the cyclone injection of calcine, improves the smelting efficiency, improves the mixing degree and fluidity of the molten bath through the operation of the multi-channel gas-solid two-phase spray gun, improves the production efficiency and combustion efficiency of tin smelting, reduces energy consumption and environmental pollution, and improves the product quality.

[0079] More specifically, the injection process of pulverized coal, dry powder and calcine in step S1 specifically includes the following steps:

[0080] Step S11: The air compressor compresses air and transports it through the pulverized coal conveying pipeline, dry powder conveying pipeline, gas phase pipeline, and calcine conveying pipeline to the feeding end of the multi-channel gas-solid two-phase spray gun.

[0081] Step S12: The calcine, dry powder, and pulverized coal sequentially enter the calcine channel, dry powder channel, and central pulverized coal channel from the feeding end of the multi-channel gas-solid two-phase spray gun.

[0082] Step S13: Under the action of the cyclone, the gas and solid particles respectively form a swirling motion inside the spray gun, and the gas-solid two-phase mixture is sprayed into the melt through the outlet end of the spray gun.

[0083] In step S11 of this embodiment, the pulverized coal, dry powder, and calcine are transported to the spray gun by the air compressor to ensure that the materials can smoothly enter the spray gun.

[0084] In step S12, the pulverized coal, dry powder, and calcine enter the corresponding channels according to the design stratification. Among them, the outlet of the innermost channel (the outlet of the pulverized coal) is immersed below the melt, and the pulverized coal is directly blown into the melt. The combustion of the pulverized coal releases heat to provide energy to maintain the high temperature state of the furnace, and in addition, a reducing atmosphere is generated to promote the reduction smelting of crude tin. The outlet of the second outermost channel (the dry powder outlet) is immersed below the melt, and the dry powder material is directly sprayed into the melt. The outlet of the outermost channel (the calcine outlet) is about 2 m away from the free liquid surface of the molten bath. Secondary combustion of carbon monoxide will occur at this height, and the temperature can reach 1350 °C, which is higher than the melting point of the calcine particles.

[0085] In step S13, through the action of the cyclone, the dispersion effect of the particles in the melt is enhanced, the heat transfer effect between the melt and the injected material is enhanced, and the smelting efficiency is improved. Among them, the dry powder channel cyclone increases the circumferential and radial velocities of the dry powder particles, generates a spiral injection trajectory, promotes their dispersion in the radial direction, and avoids local accumulation. The oxygen-enriched channel cyclone converts the injection pressure energy into kinetic energy, and at the same time redistributes the ratio of axial kinetic energy and circumferential kinetic energy. By reducing the axial kinetic energy and enhancing the circumferential kinetic energy, the stirring ability can be strengthened under the same gas volume, generating larger impact pits, and at the same time avoiding a large amount of melt splashing caused by the vertical impact of the high-speed gas flow on the melt. The outermost channel cyclone makes the calcined ore particles rotate and fall into the molten pool, avoiding the local accumulation of calcined ore particles, increasing the material uniformity at the source, converting the axial kinetic energy of the gas phase into the tangential direction, reducing the axial velocity of the particles and increasing the tangential velocity, generating a spiral material movement trajectory, increasing the residence time, promoting more particles to be preheated and melted before reaching the molten pool and participating in chemical reactions in a reducing atmosphere in advance, and accelerating the smelting process.

[0086] The utility model can improve the efficiency and product quality of tin smelting. By preheating the calcined ore, the smelting efficiency can be improved, and at the same time, the temperature of the outlet soot can be reduced, increasing the energy utilization rate. In addition, the design of the multi-channel gas-solid two-phase spray gun can realize the closed input of materials, improve the working environment, and increase the direct metal recovery rate.

[0087] Furthermore, the method for designing, matching and optimizing the injection parameters (for the specific principle, please refer to the appendix Figure 7 ), and the method for designing, matching and optimizing the injection parameters specifically includes the following steps:

[0088] Step S4: Input the injection parameters and the structural parameters of the spray gun, and input the measurement indexes of the particle dispersion degree and the soot rate; the injection parameters include the air supply volume, air pressure, and concentrate particle feeding rate of the fourth-layer baking channel; the structural parameters include the number of cyclone stages, cyclone angle, cyclone height, length of the fourth-layer calcined ore channel, outlet inclination angle, etc.;

[0089] Step S5: Analyze different working conditions through the computational fluid dynamics (CFD) computer simulation technology, and the output parameters are the particle dispersion degree and the soot rate. The output parameters are used as measurement indexes to evaluate the injection effect;

[0090] Step S6: Based on the establishment of a database of output parameters and measurement indexes, use the multiple imputation technique to obtain the combination of the best injection parameters and structural parameters.

[0091] Step S4 of this embodiment inputs the injection parameters, the structural parameters of the spray gun, and the measurement indicators of the particle dispersion degree and the soot rate; determines the basic input conditions of the injection parameters and the spray gun structural parameters, providing necessary parameters for subsequent simulation and optimization. Step S5 analyzes different working conditions through CFD computer simulation technology and outputs parameters such as the particle dispersion degree and the soot rate; through numerical simulation, evaluates the injection parameters and the spray gun structural parameters, and analyzes their influence on the particle dispersion degree and the soot rate. Step S6, based on the established database, uses the multiple imputation technique to obtain the combination of the optimal injection parameters and the structural parameters; through the comprehensive analysis and interpolation of the existing data, determines the optimal combination of the injection parameters and the spray gun structural parameters to achieve the best injection effect.

[0092] The utility model can optimize the injection parameters and the spray gun structure through computer simulation technology to improve the injection effect; by optimizing the combination of the injection parameters and the structural parameters, better particle dispersion degree can be achieved and the soot rate can be reduced, improving production efficiency and product quality, while reducing energy consumption and environmental pollution; it has important significance for the optimization and improvement of the industrial production process.

[0093] The computational fluid dynamics CFD computer simulation technology in step S5 specifically includes the following steps:

[0094] Step S51: Uses the volume of fluid method VOF to simulate the gas-liquid interface and the morphology of the impact pit, captures the interface position of the gas-liquid two-phase, and accurately describes the morphology of the impact pit;

[0095] Step S52: Obtains the common momentum equation and the continuity equation of the continuous phase to describe the motion behavior of the fluid; at the same time, adds a turbulence model to simulate the turbulence phenomenon in the fluid to describe the motion and flow properties of the fluid;

[0096] Step S53: Solves the particle motion using Newton's second law to describe the motion behavior of the particles in the fluid; by considering the mass, acceleration, and acting force of the particles, describes the force condition of the particles in the fluid; the particle-particle collision force Fcol is calculated by normal and tangential decomposition, and the normal and tangential components are obtained through decomposition calculation, which is used to accurately describe the interaction between particles.

[0097] In step S51 of this embodiment, the volume of fluid (VOF) method is used to simulate the gas-liquid interface and the shape of the impact pit, accurately capture the interface position of the gas-liquid two-phase, and describe the shape of the impact pit; it can simulate and analyze complex gas-liquid interaction phenomena, such as liquid spraying, bubble movement, etc.; achieve an accurate description of phenomena such as the gas-liquid interface and the impact pit, and provide accurate initial conditions and boundary conditions for subsequent steps. In step S52, the common momentum equation and continuity equation of the continuous phase are obtained, and at the same time, a turbulence model is added to simulate the turbulence phenomenon in the fluid; it can describe the motion behavior and flow properties of the fluid, including velocity distribution, pressure distribution, etc. At the same time, through the turbulence model, the turbulence phenomenon in the fluid can be simulated, further improving the accuracy of the flow simulation; it can accurately predict the dynamic behavior and flow characteristics of the fluid, providing an important reference basis for engineering design and optimization. In step S53, the motion of particles is solved using Newton's second law to describe the motion behavior of particles in the fluid; it can simulate the motion behavior of particles in the fluid, including the position, velocity, acceleration, etc. of the particles; by considering the mass, acceleration and acting forces of the particles, the force conditions of the particles in the fluid can be accurately described. The inter-particle collision force Fcol is calculated by normal and tangential decomposition to accurately describe the interaction between particles; it can simulate the motion behavior of particles in the fluid and the interaction between particles, providing an important engineering application basis for studying processes such as the transportation, sedimentation, and mixing of particle suspensions.

[0098] This utility model can accurately simulate and analyze complex fluid mechanics phenomena by using these steps in CFD computer simulation technology, provide an important reference basis for engineering design and optimization, and contribute to improving engineering efficiency and saving resources.

[0099] In this embodiment, the volume of fluid (VOF) method is used to capture the gas-liquid interface and the shape of the impact pit;

[0100] In CFD computer simulation technology, material particles are rotated and blown from a cyclone into a molten bath. This process involves gas-liquid-solid three-phase flow. The volume of fluid (VOF) method and the discrete element method (DEM) are used to evaluate the dispersion degree of the particles and their interaction with the molten bath. The specific scheme is as follows:

[0101] The volume of fluid (VOF) method is used to capture the gas-liquid interface and the shape of the impact pit, and its governing equations are as follows:

[0102]

[0103] ρ f = αρ l +(1 - α)ρ g (2)

[0104] μ f = αμ l+(1-α)μ g (3)

[0105] where t represents time, and u f represents the fluid velocity vector. The third term in Equation (1) is the interface compression term, which is used to mitigate the over-predicted numerical dissipation. Here, u r represents the relative velocity vector between the gas phase and the liquid phase. Equations (2) and (3) represent the density and viscosity of the continuous phase, where the subscripts f, l, and g represent fluid, liquid phase, and gas phase, respectively;

[0106] In the VOF method, the continuous phase shares the momentum equation and the continuity equation, which are described as follows:

[0107]

[0108] where ε f represents the volume fraction of the continuous phase; ρ f represents the density of the continuous phase; P f represents the fluid pressure; g is the acceleration due to gravity; μ f represents the viscosity of the fluid phase; F pf is the interaction force between the continuous phase and the discrete phase; F σ is the surface tension;

[0109] The influence of turbulence also needs to be considered in the calculation, and the governing equations are described as follows:

[0110]

[0111]

[0112] where α k and α ε are the inverse effective Prandtl numbers of k and ε, respectively. μ eff is the effective viscosity; G k represents the turbulent kinetic energy generated due to the mean velocity gradient. C 1ε and C 2ε are constants, and their values are 1.42 and 1.68, respectively. R ε is the additional term in the ε equation.

[0113] The particle motion is solved using Newton's second law, and its governing equation is as follows:

[0114]

[0115] where m p,i represents the particle mass; u p,i represents the particle velocity vector; F col,i represents the collision forces between particles and between particles and the wall; m p,i g represents gravity. Ip,i is the calculated particle moment of inertia; ω p，i is the angular velocity vector of particle rotation; M c,i is the moment on the particle. The subscript i represents the i-th particle;

[0116] The interphase interaction force F between the particle and the fluid pf,i includes the drag force F d,i , the lift force F lif,i , the pressure gradient force F p,i , the viscous force the virtual mass force F vm,i and the Basste force F B,i , which are described as follows:

[0117]

[0118]

[0119] where, V P represents the particle volume; the lift term includes the Saffman lift F lif,Saff and the Magnus lift F lif,Mag . The surface tension exerted on the particle at the gas-liquid interface is as follows:

[0120]

[0121] The particle-particle collision force F col is as follows and can be calculated by decomposing it into normal and tangential directions:

[0122]

[0123] where, k represents the elastic coefficient; η represents the damping coefficient; n and t represent the unit vectors in the normal and tangential directions; the superscripts n and t represent the tangential and normal components respectively; the subscripts i and j represent the interaction between the i-th and j-th particles.

[0124] The specific solution process is as follows:

[0125] Three-dimensional modeling: Construct a three-dimensional model according to the real industrial-scale molten bath and lance;

[0126] Discretization of the fluid domain: Discretize the three-dimensional fluid domain into polyhedral mesh elements;

[0127] Setting of boundary conditions: Set boundary conditions in the open-source solver OpenFoam, including the inlet gas velocity of different-layer feeding, the particle feeding rate, the outlet pressure, and the wall is set as a non-slip coupled standard wall function;

[0128] Setting of physical property parameters: Include the viscosities, densities, surface tension coefficients of the gas phase and slag phase, the diameters, densities, contact angles of the particles;

[0129] Solution algorithm settings: The SIMPLE algorithm is used for pressure-velocity coupling, and second-order accuracy is used for time and space discretization;

[0130] Time step settings: The fluid time step is 1×10 5 s, and the particle time step is 1×10 6 s. The discrete particles and the flow field are coupled once every 10 particle time steps;

[0131] Calculation: Given the initial field and start the calculation;

[0132] Result post-processing: Extract key indicators such as particle dispersion degree and outlet soot rate to evaluate the injection effect;

[0133] Database acquisition: Change different injection parameters and lance structures, and repeat steps 1) - 8) to obtain a database of the measurement indicators varying with the injection parameters and lance structures.

[0134] The process of using the multiple imputation technique to obtain the combination of the optimal injection parameters and structural parameters in step S6 specifically includes the following steps:

[0135] Step S61: Understand the data set and the missing pattern. For the data set of the injection system, understand the missing situation and distribution pattern of the injection parameters and structural parameters; Group the injection parameters and structural parameters separately, and select the imputation method according to their types (such as continuous type, categorical type);

[0136] Univariate imputation: For each variable with missing values in the injection parameters and structural parameters, perform separate imputation. For continuous variables, methods such as regression models, means, and medians can be used for imputation; For categorical variables, methods such as multinomial logistic regression and modes can be used for imputation;

[0137] Multiple imputation iteration: Based on univariate imputation, improve the imputation accuracy through multiple iterations. In each iteration, according to the existing complete data set, impute each variable and then update the missing values. Through multiple iterations, gradually reduce the imputation error.

[0138] Step S62: After multiple iterations, perform a convergence judgment on the imputation results. Judge whether the imputation converges according to the relationship between variables before and after imputation or the goodness of fit of the model; If the imputation results have converged, stop the iteration; Otherwise, continue the iteration until convergence.

[0139] Step S63: Generate multiple complete data sets: According to the imputation results of multiple iterations, generate multiple complete data sets. The data sets are used for subsequent analysis or modeling to obtain the combination of the optimal injection parameters and structural parameters; Use the mean method or model fusion method to integrate the results of multiple data sets.

[0140] Among them, the average value method: For the imputation results of each variable, calculate the average value of the corresponding variable in multiple datasets; combine the average values of multiple variables into a complete dataset, which contains the combination of the best injection parameters and structural parameters.

[0141] Model fusion method: Use the established model to analyze or model multiple imputed datasets to obtain the prediction results of multiple models; perform fusion methods such as weighted average and voting on the prediction results of multiple models to obtain the combination of the best injection parameters and structural parameters; according to the fused results, conduct subsequent analysis or modeling to obtain the combination of the best injection parameters and structural parameters.

[0142] The analysis includes descriptive statistical analysis: Conduct descriptive statistical analysis on the multiple complete datasets generated, such as calculating statistical indicators such as average value, standard deviation, maximum value, and minimum value, to understand the distribution of injection parameters and structural parameters; correlation analysis: By calculating the correlation coefficients between injection parameters and structural parameters in the multiple complete datasets generated, the degree of their association can be understood. This helps to determine which parameters have a greater impact on the performance of the injection system. Visualization analysis: Using the multiple complete datasets generated, data visualization analysis can be performed, such as plotting scatter plots, box plots, histograms, etc., to visually display the distribution and change trends of injection parameters and structural parameters. Modeling analysis: Use the multiple complete datasets generated to establish a model of the injection system, such as regression models, classification models, etc. Through modeling analysis, the combination of injection parameters and structural parameters can be predicted and optimized to achieve the best injection effect.

[0143] A model refers to a mathematical or statistical model used for predicting or analyzing data. It is an abstract representation of a system or process in the real world. By analyzing and modeling existing data, the characteristics or behaviors of unknown data can be inferred. In the process of obtaining the combination of optimal injection parameters and structural parameters, various models can be used for analysis and modeling, such as regression models, logistic regression models, neural network models, etc. These models can be trained using existing complete datasets and then used to predict or infer the values of missing data. The process of establishing a model includes the following steps: Data collection: Collect data samples related to the problem, including independent variables (input features) and dependent variables (output targets); Data preprocessing: Clean and process the collected data, including handling missing values, outliers, and duplicate values, and performing feature selection and feature scaling, etc.; Feature engineering: According to domain knowledge and understanding of the problem, transform, combine, or generate new features from the original features to improve the performance of the model; Model selection: According to the characteristics of the specific problem and the features of the data, select a suitable regression model. Common regression models include linear regression, polynomial regression, ridge regression, Lasso regression, etc.; Model training: Divide the dataset into a training set and a test set, and use the training set to train the selected regression model to fit the model parameters; Model evaluation: Use the test set to evaluate the trained model, calculate the prediction performance metrics of the model, such as mean squared error (MSE), root mean squared error (RMSE), mean absolute error (MAE), etc., to evaluate the accuracy and generalization ability of the model; Model tuning: According to the evaluation results, tune the model, and the hyperparameters of the model can be adjusted, such as regularization parameters, learning rates, etc., to improve the performance of the model; Model application: Use the trained model for prediction or inference to give the combination of optimal injection parameters and structural parameters.

[0144] In this embodiment, the Multiple Imputation by Chained Equations (MICE) is a data imputation method, especially suitable for handling missing data or expanding existing datasets. Its core idea is to estimate the missing data and generate multiple complete datasets by utilizing the information in the existing dataset and combining the relationships between multiple variables. These datasets can be used for subsequent analysis or modeling to obtain more accurate and reliable results.

[0145] Implementing the MICE method is generally divided into the following steps:

[0146] 1) Understand the dataset and the missing pattern: Before starting, it is necessary to have an overall understanding of the dataset, including data types, relationships between variables, and the distribution and pattern of missing data. Understanding the pattern of missing data helps to select appropriate imputation methods and models;

[0147] 2) Variable grouping: Group the variables in the dataset according to their types (such as continuous, categorical), which helps to better select appropriate imputation models in the subsequent imputation process;

[0148] 3) Single-variable imputation: Impute each variable with missing values separately. For continuous variables, methods such as regression models, mean, median, etc. can be used for imputation; for categorical variables, methods such as multinomial logistic regression, mode, etc. can be used for imputation;

[0149] 4) Multiple imputation iteration: Based on single-variable imputation, improve the imputation accuracy through multiple iterations. In each iteration, impute each variable according to the existing complete dataset, and then update the missing values. Through multiple iterations, the imputation error can be gradually reduced and the imputation accuracy can be improved;

[0150] 5) Convergence judgment: After multiple iterations, it is necessary to judge the convergence of the imputation results. Usually, the relationship between variables before and after imputation or the goodness of fit of the model can be used to judge whether the imputation converges. If the imputation results have converged, the iteration can be stopped; otherwise, continue the iteration until convergence;

[0151] 6) Generate multiple complete datasets: Finally, according to the imputation results of multiple iterations, generate multiple complete datasets; the datasets can be used for subsequent analysis or modeling to obtain more accurate and reliable results. Usually, the average method or model fusion method can be used to integrate the results of multiple datasets.

[0152] Through the above process in this embodiment, the MICE method can effectively handle missing data, generate multiple complete datasets, improve the accuracy and reliability of data analysis and modeling, and thus obtain the combination of injection parameters and lance structure parameters corresponding to the optimal injection parameters.

[0153] The single-variable imputation technology in step S61 of the embodiment of the present utility model can predict and fill in the missing injection parameters and structure parameters based on the existing complete data; by selecting appropriate imputation methods, the imputation error can be reduced and the accuracy and reliability of the data can be maintained. The multiple imputation iteration technology in step S62 improves the imputation accuracy through multiple iterations. In each iteration, imputation is performed according to the existing complete dataset, and the imputation error is gradually reduced, making the imputation result approach the true value. There are two methods for generating multiple complete datasets in step S63, the average method and the model fusion method. The average method takes the average of the results of multiple imputed datasets to obtain the final complete dataset; the model fusion method inputs multiple imputed datasets into different models for analysis and modeling, and then fuses the results of different models to obtain the final complete dataset.

[0154] In summary, the goal of these steps in this embodiment is to obtain the combination of the best injection parameters and structural parameters. By interpolating the missing data, a complete data set can be obtained, making subsequent analysis and modeling more accurate and reliable. The ultimate goal is to find the combination of the best injection parameters and structural parameters, thereby optimizing the performance and effect of the injection system.

[0155] For the devices and usage methods disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, refer to the description in the method section.

[0156] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tin smelting multi-channel gas-solid cyclone injection feed preheating device, characterized in that: include: A multi-channel gas-solid two-phase spray gun (9), a pulverized coal conveying pipeline (2), a dry powder conveying pipeline (3), a gas phase pipeline (4) and a roasted sand conveying pipeline (5); The multi-channel gas-solid two-phase spray gun (9) is provided with a plurality of pipeline channels in layers inside and outside, and one end of the multi-channel gas-solid two-phase spray gun (9) corresponding to the pipeline channel is a feed end, and the other end is a discharge end; The pulverized coal conveying pipeline (2), the dry powder conveying pipeline (3), the gas phase pipeline (4) and the roasted sand conveying pipeline (5) are sequentially connected to the feed end of the multi-channel gas-solid two-phase spray gun (9); the ends of the pulverized coal conveying pipeline (2), the dry powder conveying pipeline (3), the gas phase pipeline (4) and the roasted sand conveying pipeline (5) are all connected to an air compressor (1) to provide pumping pressure; The pulverized coal conveying pipeline (2) is connected to a pulverized coal storage tank (6) for providing a pulverized coal source, the dry powder conveying pipeline (3) is connected to a dry powder storage tank (7) for providing a dry powder source, and the roasted sand conveying pipeline (5) is connected to a roasted sand storage tank (8) for providing a roasted sand source.

2. A tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 1, characterized in that: The feed end of the multi-channel gas-solid two-phase spray gun (9) is provided with a pulverized coal feed port (19), a dry powder feed port (20), a gas phase interface (21) and a roasted sand feed port (22) in order from the inside to the outside. The pulverized coal feed port (19) is connected to the pulverized coal conveying pipeline (2), the dry powder feed port (20) is connected to the dry powder conveying pipeline (3), the gas phase interface (21) is connected to the gas phase pipeline (4), and the roasted sand feed port (22) is connected to the roasted sand conveying pipeline. (5) connected; the pipeline channels of the multi-channel gas-solid two-phase spray gun (9) are, from the inner layer to the outer layer, a pulverized coal channel (14), a dry powder channel (15), an oxygen-enriched air channel (16) and a roasted sand channel (17); the discharge end of the multi-channel gas-solid two-phase spray gun (9) is, from the inner layer to the outer layer, a pulverized coal discharge port, a dry powder discharge port, an air flow outlet and a roasted sand discharge port; the roasted sand discharge port has a height difference of 1.5m to 2.5m from the pulverized coal discharge port, the dry powder discharge port and the air flow outlet.

3. A tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 2, characterized in that: The multi-channel gas-solid two-phase spray gun (9) is provided with a roasted sand channel cyclone (18) near the roasted sand discharge port. The roasted sand channel cyclone (18) has a spiral channel and changes the discharge direction of the roasted sand, so that the roasted sand (11) produces a spiral motion trajectory. The roasted sand passes through the roasted sand cyclone (18) and is sprayed out from the roasted sand discharge port. The roasted sand discharge port is configured with a constricted opening.

4. A tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 2, characterized in that: A plurality of oxygen-enriched air channel cyclones (23) are arranged in the oxygen-enriched air channel (16) at intervals corresponding to the gas conveying direction, and the oxygen-enriched air channel cyclones (23) are used to change the gas flow direction in the oxygen-enriched air channel and generate a swirl.

5. A tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 4, characterized in that: The spiral channel angles of the plurality of oxygen-enriched air channel cyclones (23) are different, and the spiral angles corresponding to the airflow outlet direction increase step by step.

6. A tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 2, characterized in that: The dry powder channel (15) is provided with a dry powder channel cyclone (24) near the dry powder discharge port, and the dry powder channel cyclone (24) is used to increase the circumferential and radial speeds of the dry powder particles and generate a spiral dry powder spraying trajectory.

7. The tin smelting multi-channel gas-solid cyclone injection feed preheating device according to claim 1, characterized in that: The corresponding outlet pipelines of the pulverized coal storage tank (6), the dry powder storage tank (7), and the roasted sand storage tank (8) are connected with valves for controlling the material flow rate. The pulverized coal storage tank (6), the dry powder storage tank (7), and the roasted sand storage tank (8) are connected to the pulverized coal conveying pipeline (2), the dry powder conveying pipeline (3), and the roasted sand conveying pipeline (5) through the corresponding outlet pipelines.

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