Centrifugal granulation collection device and method based on liquid film cooling and wall attachment effect

Abstract

The invention belongs to the technical field of metallurgical industry, and particularly relates to a centrifugal granulating and collecting device and method based on liquid film cooling and wall attachment effect, the centrifugal granulating and collecting device comprises a granulating mechanism and a collecting mechanism, the collecting mechanism is arranged around the granulating mechanism, and the inner circumferential wall of the collecting mechanism is covered with a flowing liquid film; the inner peripheral wall of the collecting mechanism comprises a slag particle impact area which is positioned at the upper part and collides with the slag particles formed by the granulating mechanism and cools the slag particles and a separation expansion area which is positioned at the lower part and expands outwards, and the separation expansion area is configured to enable a flowing liquid film to be attached to the wall surface of the separation expansion area to flow by utilizing a wall attachment effect; the slag particles are separated from the wall surface of the separation expansion area under the action of gravity and inertia so as to be separated from the liquid film; according to the device, high-temperature slag particles can be rapidly cooled to prevent adhesion, meanwhile, slag and cooling medium water can be rapidly and effectively separated, favorable conditions are created for follow-up possible sensible heat recovery, and it is guaranteed that dry, uniform and high-quality granulated slag products are finally obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metallurgical industry and solid waste resource utilization, and particularly relates to a centrifugal granulation and collection device and method based on liquid film cooling and wall attachment effect. BACKGROUND

[0002] Blast furnace ironmaking is the main process of modern steel production, and about 300-400 kg of blast furnace slag will be produced per ton of pig iron. The slag is discharged at a temperature of 1450-1550℃, containing a large amount of high-quality sensible heat, with a heat enthalpy of about 1700-1800 megajoules per ton of slag. If this part of heat can be effectively recovered, it can meet a considerable part of the energy demand in the blast furnace production process, and even be used for power generation, thereby achieving significant energy saving and carbon emission reduction.

[0003] However, the mainstream process of blast furnace slag treatment is still mainly water quenching. This method is to pour high-temperature molten slag into a large amount of cooling water, and the molten slag is granulated to form glass particles (water quenched slag) through rapid cooling, which is used as a cement raw material. Although the water quenching process is mature and the product has a market, it has the following inherent defects: 1. Heat cannot be recovered: The huge sensible heat of the molten slag is wasted in an instant when it comes into contact with water, not only resulting in a huge loss of energy, but also requiring energy to heat and evaporate a large amount of cooling water, and generating a large amount of steam containing sulfur and other pollutants, causing environmental load.

[0004] 2. Water resource consumption and pollution: This process requires a large amount of fresh water, and produces wastewater containing harmful substances such as sulfides and cyanides, which requires a complex wastewater treatment system, increasing the operating cost and environmental risk.

[0005] 3. Poor safety: Molten slag may explode due to vaporization expansion in an instant when it comes into contact with water, posing a serious safety hazard.

[0006] 4. Inhomogeneous slag particle quality: The water quenching process is difficult to control, and is prone to internal stress cracks, and the particle size distribution of the slag particles is uneven, affecting their performance as building materials.

[0007] In order to overcome the shortcomings of water quenching, dry granulation technology has emerged. Among them, centrifugal granulation technology is considered to be a promising direction due to its low energy consumption, small particle size, and controllable particle size distribution. The basic principle of this technology is to use a high-speed rotating disc or cup to break and stretch the molten slag stream, which is thrown out under the action of centrifugal force, and cools and solidifies into solid particles in the air, but the existing centrifugal granulation technology still faces many challenges: 1. Insufficient cooling efficiency: The natural cooling speed of slag particles in air is slow, which may cause them to be in a semi-molten or high-temperature plastic state when collected, easily sticking together into large blocks or adhering to the inner wall of the collection device, causing equipment blockage, operation interruption, and affecting the particle size distribution and quality of the final product.

[0008] 2. Difficult to adapt to flow mutation state: The slag flow of a blast furnace or other metallurgical furnace often fluctuates during the entire slagging process. When the slag flow changes suddenly, the rotary cup has difficulty in adapting to the sudden change in slag quantity, especially after the flow increases, the subsequent cooling intensity cannot respond quickly, and large blockage is more likely to occur, affecting the smooth running of the system.

[0009] The patent slag granulation initial cooling section device (ZL202122742856.4) proposes to forcibly blow air in the collection wall and set a high cooling section to prolong the falling and cooling time of the slag particles to prevent sticking. However, the height difference between the granulator and the discharge port of this technical solution is large, often more than 8-10 meters, which not only increases the cost of civil construction, but also increases the investment in equipment. SUMMARY

[0010] The technical problem to be solved by the present application is to solve the problems of insufficient cooling efficiency and difficulty in adapting to flow mutation state in the prior art. A centrifugal granulation and collection device based on liquid film cooling and wall attachment effect is provided.

[0011] The technical solution adopted by the present application to solve the technical problem is: a centrifugal granulation and collection device based on liquid film cooling and wall attachment effect, comprising: a granulation mechanism for receiving high-temperature liquid slag and centrifugally granulating it into slag particles; and a collection mechanism arranged around the granulation mechanism and covered with a flowing liquid film on the inner wall, the collection mechanism comprising a slag particle impact area at the upper part to collide with the slag particles formed by the granulation mechanism and cool them, and a separation expansion area at the lower part and expanding outward, the separation expansion area is configured to use the wall attachment effect to make the flowing liquid film adhere to the wall surface of the separation expansion area to flow, while the slag particles are separated from the liquid film under the action of gravity and inertia.

[0012] Further, the wall surface of the slag particle impact area is cylindrical, and the wall surface of the separation expansion area is a circular truncated cone shape gradually expanding in the direction away from the slag particle impact area.

[0013] Further, the wall surface of the slag particle impact area is a reverse cone shape gradually narrowing in the direction approaching the separation expansion area, and the wall surface of the separation expansion area is cylindrical.

[0014] Further, the liquid injection mechanism is arranged above the collecting mechanism, and is used to inject cooling liquid to the inner circumferential wall of the collecting mechanism to form the liquid film.

[0015] Further, the liquid injection mechanism comprises an annular liquid injection groove arranged around the collecting mechanism.

[0016] Further, the liquid injection mechanism comprises a plurality of liquid injection ports arranged along the circumference of the collecting mechanism.

[0017] Further, the granulating mechanism is a rotating cup made of high-temperature-resistant alloy, and the inner circumferential wall of the collecting mechanism is coated with a wear-resistant and fire-resistant lining.

[0018] Further, the liquid collecting groove is arranged at the bottom of the liquid film flow path, and the slag collecting groove is arranged at the bottom of the slag particle movement path.

[0019] Further, the liquid collecting groove is connected to the liquid injection mechanism through a liquid supply pipeline.

[0020] A method for the centrifugal granulation and collecting device based on the liquid film cooling and the wall attachment effect, comprising the following steps: (a) the high-temperature liquid slag is stably dropped onto the high-speed rotating granulating mechanism, and the granulating mechanism granulates the slag into small slag particles through centrifugal force and throws them outwards; (b) the liquid injection mechanism is used to inject cooling water to the collecting device to form a downward flowing liquid film covering the inner circumferential wall of the collecting device; (c) the high-temperature slag particles flying out of the granulating mechanism impact on the liquid film in the slag particle impact area and are rapidly cooled and solidified; (d) when the liquid film carrying the slag particles flows from the slag particle impact area to the separation and expansion area, the liquid film adheres to the wall of the separation and expansion area and flows to the liquid collecting groove due to the wall attachment effect, and the slag particles fall into the slag collecting groove under the action of gravity and inertia.

[0021] The present application has the following advantages: 1. Efficient cooling and anti-adhesion: the continuous flowing liquid film arranged on the inner circumferential wall of the collecting mechanism provides a complete and continuously updated cooling interface for the high-temperature slag particles. The slag particles are forced to cool instantly when they impact, and are rapidly changed from the molten or plastic state to the solid state, thereby fundamentally solving the technical problems of slag particle adhesion to form large blocks and slag particle adhesion to the collecting wall, and ensuring the continuous and stable operation of the device and the uniform particle size of the product.

[0022] 2.Quick and efficient separation of slag and water: innovatively using the wall attachment effect, by designing a separation expansion area deviating from the extension direction of the slag particle impact area, the liquid film and slag particles are naturally separated in the flow process. This separation method does not require additional mechanical screening or power equipment, the separation process is continuous, stable, low in energy consumption, and high in separation efficiency, and the water content of the finally collected slag particles is extremely low, almost dry, greatly facilitating subsequent transportation, storage and resource utilization.

[0023] 3. Create conditions for heat recovery: although water is directly used as the cooling medium in this scheme, the contact time of water and slag is minimized through quick slag-water separation, and the thickness of the water film is adjusted to adapt to different slag flow. Thus, the conversion loss of high-quality heat to low-grade steam is reduced. The collected high-temperature, dry slag particles can be more easily recovered by subsequent dry heat exchange systems such as fluidized bed heat exchangers and moving bed heat exchangers, improving the grade and efficiency of energy recovery in the entire system.

[0024] 4. Simple and reliable structure, strong adaptability: the main body of the device is a static structure, with no complex moving parts working in high-temperature areas, high reliability, and easy maintenance. By adjusting the particleizing mechanism speed, liquid film flow, and the geometric parameters of the separation expansion area wall, the device can flexibly adapt to the processing requirements of different components and different flow of molten slag, with good process adaptability.

[0025] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, which description should be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application is further described below in conjunction with the drawings and examples.

[0027] Figure 1 is a structural schematic diagram of embodiment one of the present application; Figure 2 is a structural schematic diagram of embodiment two of the present application; Figure 3 is a structural schematic diagram of the liquid injection mechanism being a ring-shaped liquid injection tank in the present application; Figure 4 is a structural schematic diagram of the liquid injection mechanism being a plurality of liquid injection ports in the present application; Figure 5 is a structural schematic diagram of the liquid film and the collection mechanism in the present application; In the drawings: 1, particleizing mechanism; 2, collection mechanism; 21, slag particle impact area; 22, separation expansion area; 3, liquid injection mechanism; 31, ring-shaped liquid injection tank; 32, liquid injection port; 4, liquid supply pipeline; 5, slag collection tank; 6, liquid collection tank; 7, slag flow guide channel; 8, liquid film; 9, slag particle movement path; 10, liquid film flow path. DETAILED DESCRIPTION

[0028] The application will now be described in further detail with reference to the drawings. These drawings are simplified schematic illustrations of the basic structure of the application and are therefore only to illustrate the application in a schematic way and thus only show the construction relevant to the application, the directions and references (e.g. up, down, left, right, etc.) can only be used to facilitate the description of the features in the drawings. The following detailed description is therefore not to be taken in a limiting sense and the scope of the subject matter sought to be protected is defined only by the claims that follow this detailed description and their equivalents. EMBODIMENT

[0029] As shown in Figure 1 , Figures 3-5 , a centrifugal granulation and collection device based on liquid film cooling and wall attachment effect, comprising a granulation mechanism 1, a collection mechanism 2, a liquid injection mechanism 3, a liquid collection tank 6 and a slag collection tank 5: The granulation mechanism 1 is used to receive high-temperature liquid slag falling from above and centrifugally granulate it into slag particles, the granulation mechanism 1 is a rotating cup, the material of which is high-temperature resistant alloy, the high-temperature liquid slag falls to the surface of the high-speed rotating granulation mechanism 1 through the slag flow distributor or slag flow guide groove 7 located directly above the granulation mechanism 1. Under the action of its own gravity and the centrifugal force of the rotating cup, the slag is quickly thinned and torn and granulated into a large number of small molten slag droplets, which fly outward along the tangential direction or at a specific angle of the rotating cup; The collection mechanism 2 is a rotary body structure and is arranged around the granulation mechanism 1, preferably, the granulation mechanism 1 and the collection mechanism 2 are coaxially arranged, the granulation mechanism 1 is located at the center of the collection mechanism 2, the inner peripheral wall of the collection mechanism 2 is lined with wear-resistant and refractory lining and covered with a flowing liquid film 8, the liquid film 8 is continuous, and the collection mechanism 2 includes a slag particle impact area 21 located at the upper part to collide with and cool the slag particles formed by the granulation mechanism 1 and a separation expansion area 22 located at the lower part and expanding outward; The slag particle impact area 21 corresponds in position to the granulation mechanism 1, which is used to receive the high-temperature slag particles flying out from the granulation mechanism 1; The separation expansion area 22 is located below the slag particle impact area 21 and the two are smoothly transitioned to form an expansion wall surface, the curvature of the generatrix of the expansion wall surface can be determined through fluid mechanics simulation and experiment, which ensures smooth transition to maximize the occurrence of wall attachment effect, the separation expansion area 22 is configured to utilize the wall attachment effect to make the flowing liquid film 8 adhere to the wall surface of the separation expansion area 22 to flow, while the slag particles are separated from the liquid film 8 under the action of gravity and inertia to realize the separation of the paths of slag and water.

[0030] The Coanda effect is the tendency of a fluid flow or gas flow to follow a convex surface, changing its direction from the original stream. When there is surface friction between the fluid and the surface it flows over, also known as fluid viscosity, the fluid will follow the surface as long as the curvature is not too great. The angle of the inner wall of the collecting mechanism 2 changes gently, ensuring that the curvature meets the requirements of the effect, and controlling the thickness of the liquid film 8 ensures that the water flow follows the effect; The liquid injection mechanism 3 is arranged above the collecting mechanism 2, and is used to continuously and stably inject liquid to the inner wall of the collecting mechanism 2. The liquid can be cooling water. Under the action of gravity and the momentum of the water flow itself, a uniform and continuous liquid film 8 is formed, which cools the slag particles to below the bonding temperature. The liquid injection mechanism 3 includes an annular liquid injection groove 31 surrounding the collecting mechanism 2, or a plurality of liquid injection ports 32 arranged circumferentially along the collecting mechanism 2.

[0031] The flow rate of the liquid injection mechanism 3 can be adjusted to form a liquid film 8 of different thicknesses. The flow rate needs to ensure that a continuous and complete liquid film 8 is formed on the entire inner wall. The flow rate is usually calculated according to the flow rate and temperature of the molten slag to ensure that the slag particles can be cooled to below the bonding temperature. The thickness of the liquid film 8 in the collecting mechanism 2 can be monitored by image detection, liquid level measurement, etc., and then adjusted. Preferably, the thickness of the liquid film 8 is controlled to be between 1mm and 3mm, which reduces water consumption and also avoids rapid cooling of the slag particles.

[0032] The liquid collecting groove 6 is located at the bottom of the liquid film flow path 10 and is used to collect liquid. The slag collecting groove 5 is located at the bottom of the slag particle movement path and is used to collect slag particles. The liquid collecting groove 6 is connected to the liquid injection mechanism 3 through the liquid supply pipeline 4, and a circulating pump is installed on the liquid supply pipeline 4. After the cooling water is collected by the liquid collecting groove 6, the circulating pump is used to deliver the cooling water to the liquid injection mechanism 3 above, thereby realizing the recycling of the cooling water.

[0033] The working principle of the separation is as follows: the high-temperature slag particles flying out of the granulating mechanism 1 are rapidly cooled and solidified when impacting on the liquid film 8 on the upper part of the collecting mechanism 2, thereby greatly reducing the adhesion tendency between the slag particles and between the slag particles and the wall surface. The cooled slag particles and the liquid film 8 flow downward along the wall surface under the action of gravity. When they reach the outwardly expanding expansion wall surface, the liquid film 8 with stronger flowability closely adheres to the smooth expansion wall surface under the effect of the wall attachment effect, changes the flow direction, and flows outward and downward along the wall surface. The solid or semi-solid slag particles, due to their larger mass, stronger inertia, and poorer wettability with the wall surface, are less affected by the wall attachment effect. Therefore, the slag particles will mainly rely on their own gravity and inertia to move inward and downward along the tangential direction of the trajectory before reaching the separation expansion area 22, thereby separating from the wall surface. Finally, the liquid film 8 is guided into the liquid collecting groove 6 below the side wall of the device for discharge, and the slag particles pass through the central space and fall into the slag collecting groove 5 (such as a slag storage bin or a conveyor) at the bottom of the device, thereby realizing the spatial path separation and effective collection of slag and water.

[0034] The wall surface of the slag particle impact area 21 in the embodiment is cylindrical, and the wall surface of the separation expansion area 22 is a circular truncated cone shape gradually expanding away from the slag particle impact area 21. The embodiment as a whole has a rotary body structure of a cylindrical upper part and a smooth outwardly expanding horn-shaped lower part, and can be welded from heat-resistant and wear-resistant steel plates. The specific collection method is as follows: the granulating mechanism 1 is suspended in the center of the device by the main shaft and driven by the driving motor at a speed of 800-2000 rpm. The high-temperature molten slag at about 1500°C is guided to the central recess of the granulating mechanism 1 through the slag flow guide groove 7. When working, the high-speed rotating granulating mechanism 1 centrifugally throws out the molten slag to form a large number of fine slag droplets. These high-temperature slag droplets fly out along the radial direction and impact on the inner circumferential wall of the collecting device. The upper part of the inner circumferential wall (i.e., the particle impact area 21) is a cylindrical section in the embodiment. At the upper edge of this area, the liquid supply pipeline 4 provides cooling water to the liquid injection mechanism 3. The cooling water (which can be industrial circulating water) is uniformly injected to form a layer of liquid film 8 on the surface of the cylindrical inner wall, which flows downward.

[0035] The high-temperature slag droplets / slag particles impact on the liquid film 8, undergo intense heat exchange, and are rapidly cooled and solidified to form solid slag particles. At the same time, due to the vaporization of water and the flow of the water film, the slag particles cannot adhere to the collecting wall, and the mixture of the slag particles and the liquid film 8 flows downward along the cylindrical wall surface.

[0036] When the flow reaches the lower edge of the cylindrical section, i.e. the expanding wall of the separation expansion zone 22, the generatrix of the expanding wall is a smooth curve, the curvature radius of which is designed to effectively guide the adhesion of the fluid. Due to the wall adhesion effect, the liquid film 8 with good continuity will closely adhere to the smooth outwardly expanding wall, change the flow direction, and flow outwardly and downwardly along the wall. The solid slag particles, due to their large inertia, will have a movement trajectory that is less affected by the change in the wall shape after leaving the constraint of the cylindrical section. They will basically follow the tangent direction of the original falling trajectory, and will deviate from the wall and be projected inwardly and downwardly.

[0037] Finally, the wall-adhering liquid film 8 is guided into the liquid collection tank 6 at the lowermost part of the device, and is discharged from the device for subsequent treatment or recycling cooling. The dry and substantially cooled slag particles pass through the central space by gravity and are collected into the slag collection tank 5 (for example, a closed slag bin which can be connected to a vibrating conveyor) at the bottom. In this structure, the liquid film 8 flows outwardly along the wall, and the slag particles fall substantially vertically, achieving clear physical separation. Embodiment

[0038] As shown in Figure 2 , the difference between Embodiment Two and Embodiment One lies in the shape of the collection mechanism 2. In this embodiment, the wall of the slag impact zone 21 is a reverse taper which gradually narrows in the direction approaching the separation expansion zone 22, and the wall of the separation expansion zone 22 is cylindrical. This structure can reduce the floor area occupied by the slag collection tank 5, and the reverse taper-shaped slag impact zone 21 can better converge the horizontally flying slag particles from the rotating disc 1, so that the slag particles impact the wall at a smaller incident angle, which can help to reduce the wall wear; The collection method is as follows: Cooling water is injected from above the reverse taper-shaped wall and forms a downwardly flowing liquid film 8. By adjusting the water injection flow rate, the water film thickness is maintained in the range of 1mm-3mm, and the high-temperature slag particles are cooled and solidified at this time; In this embodiment, the slag-water separation starts from the lower edge of the reverse taper, first passes through a short and smooth transition, and then turns into a vertical downward cylindrical section. The vertical downward is also based on the wall adhesion effect compared to the previous reverse taper. The specific process is as follows: when the slag-water mixture flows from the reverse taper wall to the transition section and enters the vertical section, the liquid film 8 will continue to adhere to the wall due to the wall adhesion effect, and change the flow direction to flow vertically downward along the wall. The slag particles with large inertia will move in the direction along the extension line of the reverse taper wall, i.e. towards the central axis of the device. Therefore, the movement trajectory 11 of the slag particles is an inwardly inclined parabola.

[0039] Finally, the liquid film 8 flows down along the vertical wall and enters the liquid collection tank 6, while the slag particles, due to their inward trajectory, gather in the central area of ​​the device and fall into the slag collection tank 5. In this structure, the water film flows downward along the wall, while the slag particles move inward along the extension line of the inverted cone-shaped wall, thus achieving effective separation of slag and water.

[0040] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A centrifugal granulation collection device based on liquid film cooling and wall attachment effect, characterized by: It comprises: a granulating mechanism (1) for receiving high-temperature liquid slag and centrifugally granulating it into slag particles; and a collecting mechanism (2) arranged around the granulating mechanism (1) and having a flow liquid film (8) coated on the inner circumferential wall, the collecting mechanism (2) comprising a slag particle impact area (21) at the upper part to collide with and cool the slag particles formed by the granulating mechanism (1) and a separation expansion area (22) at the lower part and expanding outward, the separation expansion area (22) being configured to utilize the wall attachment effect to make the flow liquid film (8) flow along the wall surface of the separation expansion area (22), while the slag particles are separated from the liquid film (8) under the action of gravity and inertia.

2. The centrifugal granulation and collection device based on liquid film cooling and wall attachment effect according to claim 1, characterized in that: The wall surface of the slag particle impact area (21) is cylindrical, and the wall surface of the separation expansion area (22) is frustoconical and gradually expands in the direction away from the slag particle impact area (21).

3. The centrifugal granulation and collection apparatus based on liquid film cooling and wall attachment effect according to claim 1, characterized in that: The wall surface of the slag particle impact area (21) is inverted conical and gradually shrinks in the direction approaching the separation expansion area (22), and the wall surface of the separation expansion area (22) is cylindrical.

4. The centrifugal granulation and collection apparatus based on liquid film cooling and wall attachment effect according to claim 1, characterized in that: It further comprises a liquid injection mechanism (3) arranged above the collecting mechanism (2), the liquid injection mechanism (3) being used to inject cooling liquid to the inner circumferential wall of the collecting mechanism (2) to form the above-mentioned liquid film (8), and the flow of the liquid injection mechanism (3) being adjustable to form liquid films (8) of different thicknesses.

5. The centrifugal granulation and collection apparatus based on liquid film cooling and wall attachment effect according to claim 4, characterized in that: The liquid injection mechanism (3) comprises an annular liquid injection groove (31) arranged around the collecting mechanism (2).

6. The centrifugal granulation and collection apparatus based on liquid film cooling and wall attachment effect according to claim 4, characterized in that: The liquid injection mechanism (3) comprises a plurality of liquid injection ports (32) arranged at intervals in the circumferential direction of the collecting mechanism (2).

7. The centrifugal granulation and collection apparatus based on liquid film cooling and wall-attachment effect according to claim 1, characterized in that: The granulating mechanism (1) is a rotating cup made of high-temperature-resistant alloy, and the inner circumferential wall of the collecting mechanism (2) is coated with a wear-resistant and fire-resistant lining.

8. The centrifugal granulation and collection apparatus based on liquid film cooling and wall attachment effect according to claim 4, characterized in that: It further comprises a liquid collecting groove (6) at the bottom of the liquid film flow path (10) and a slag collecting groove (5) at the bottom of the slag particle movement path (9).

9. The centrifugal granulation and collection device based on liquid film cooling and wall attachment effect according to claim 8, characterized in that: The liquid collecting groove (6) is connected with the liquid injection mechanism (3) through a liquid supply pipeline (4).

10. A method of centrifugal granulation and collection based on liquid film cooling and wall-attachment effect according to any one of claims 1-9, characterized in that: It comprises the following steps: (a) high-temperature liquid slag stably falls onto the high-speed rotating granulating mechanism (1), and the granulating mechanism (1) granulates the slag into small slag particles by centrifugal force and throws them outward; (b) cooling water is injected into the collecting mechanism (2) by the liquid injection mechanism (3) to form a downward flowing liquid film (8) covering the inner circumferential wall of the collecting mechanism (2); (c) high-temperature slag particles flying out of the granulating mechanism (1) impact on the liquid film (8) of the slag particle impact area (21) and are rapidly cooled and solidified; (d) when the liquid film (8) carrying the slag particles flows from the slag particle impact area (21) to the separation expansion area (22), the liquid film (8) flows along the wall surface of the separation expansion area (22) due to the wall attachment effect and flows to the liquid collecting groove (6), while the slag particles fall to the slag collecting groove (5) under the action of gravity and inertia and are separated from the liquid film (8).

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