A steel slag hot quenching dust removal system and its application method

Abstract

This invention relates to a steel slag hot quenching dust removal system and its usage method, comprising: a hot quenching tank; a gas collection section; a demisting component; a dust removal component is included between the gas collection section and the demisting component, the dust removal component comprising: a spray section; an acceleration section, connected to the spray section, which increases the flow velocity of the dust-laden gas by means of a narrowing diameter, causing the water vapor to collide and mix with the particles in the dust-laden gas to form a clump of liquid; a deceleration section; a rotation section, connected to the deceleration section, which rotates the dust-laden gas; a diversion section; the diversion section is fitted with a frustum-shaped pipe section with a narrowing diameter facing the direction of the dust-laden gas, separating the clean airflow at the center of the dust-laden gas from the surrounding dust-laden clumps; and a recovery section, connected to the diversion section, which collects the clumps collected under gravity. The beneficial effects are: the use of pre-spraying and rotational dehydration eliminates the impact of steam transportation during the steel slag hot quenching process on the pipeline.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical environmental protection technology, specifically relating to a steel slag hot quenching dust removal system and its usage method. Background Technology

[0002] Hot slag dust removal is a key environmental protection technology used in the hot slag treatment of molten steel slag during steel smelting. Its core lies in effectively controlling the large amount of high-temperature, dust-laden flue gas generated during the hot slag process through a highly efficient dust removal system. In the hot slag process, after the high-temperature molten steel slag is poured into the hot slag tank, it is rapidly cooled and hydrated by water spraying, generating a large amount of steam and dust. At this time, the dust removal system must quickly capture these flue gases containing particles such as calcium oxide, iron oxide, and silicates to prevent them from escaping into the atmosphere and causing environmental pollution. This system typically employs a combination of closed-hood collection and wet or dry dust removal technologies. It utilizes equipment such as bag filters, electrostatic precipitators, or wet scrubbing towers to cool, condition, and efficiently filter the high-temperature, high-humidity flue gas, ensuring that the emission concentration meets national environmental protection standards. Simultaneously, the recovered dust can be returned to the sintering or steelmaking processes as raw material for reuse, achieving the dual goals of resource recycling and environmental protection.

[0003] The inventors discovered during their research on existing technologies that the hot quenching process of steel slag generates high-temperature, high-humidity, dust-laden steam, which easily forms dust and sludge that adheres and accumulates in pipelines and inside equipment. Long-term operation can easily cause problems such as pipeline blockage, equipment scaling and wear. To solve these problems, it is usually necessary to use water washing or mist spraying throughout the entire process to reduce the emission of dust in the flue gas. However, this requires a huge amount of water. Even if the water consumption is reduced, it is still impossible to solve the corrosion and caking problems during pipeline transportation.

[0004] Therefore, there is an urgent need for a steel slag hot quenching dust removal system and its usage method to overcome the problem of pipe caking when water consumption is low. Summary of the Invention

[0005] To overcome the problems in existing technologies, this invention employs a primary dust removal pre-filter to remove the vast majority of coarse particles, keeping the dust removal pipeline clean. Compared to traditional wet dust removal, it eliminates the need for continuous spray nozzle cleaning along the entire pipeline, thus protecting the transport pipeline. The technical solution adopted by this invention is: a steel slag hot quenching dust removal system, comprising: Hot, stuffy pool; The gas collection section is a pipe section for collecting the dust-laden gas generated in the hot sump. Defogging components are components designed to eliminate moisture. A dust removal component is included between the gas collection section and the demisting component, and the dust removal component includes: The spray section is connected to the gas collection section and sprays water vapor toward the dust-laden gas; The acceleration section, which is connected to the spray section, increases the flow velocity of the dust-laden gas by narrowing its diameter, so that the water vapor collides and mixes with the particles in the dust-laden gas to form a liquid clump. The deceleration section is a pipe section that reduces the flow velocity of the dust-laden gas by means of an increased diameter in order to connect with the acceleration section; The rotating section is a pipe section connected to the deceleration section, which causes the dust-laden gas to rotate. The diversion section is a tube segment that is connected to the rotating section to separate the liquid clumps that adhere to the side wall of the rotating section after centrifugation. The inner sleeve of the diversion section is a truncated cone tube section that narrows towards the direction of the dust-laden gas, separating the clean airflow in the center of the dust-laden gas from the dust-laden liquid clumps on the periphery; The recovery section is connected to the diversion section and collects the liquid clumps that have gathered under the influence of gravity.

[0006] Furthermore, it also includes: A purification system is a system for purifying water. The purification system is connected to the recovery section, the demisting component, and the spray section respectively, purifying the collected dust-containing liquid and simultaneously providing water vapor to the spray section to achieve independent circulation.

[0007] Furthermore, the purification system includes: Sedimentation tanks separate water from impurities through sedimentation. A water storage tank is used to extract clean water from the surface of the sedimentation tank. The recovery section and the demisting component are connected to the sedimentation tank; The spray section is connected to the water storage tank.

[0008] Furthermore, The demisting component is a demister.

[0009] Furthermore, The rotating section includes a wind-breaking cone and fan blades facing the direction of the dust-laden gas; The air-breaking cone guides the dust-laden gas to separate to the periphery and rotates centrifugally.

[0010] Furthermore, The spray section includes a side-openable inspection port.

[0011] A method for using a steel slag hot quenching dust removal system includes the following steps: The gas collection section collects the dust-laden gas from the hot sump and transports it to the spray section; The spray section sprays the water vapor along the flow direction of the dust-laden gas at an angle greater than the maximum diameter of the acceleration section; The water vapor and the particles in the dust-laden gas collide and mix in the acceleration section to form the liquid mass; The liquid mass enters the rotating section and, under the action of centrifugal force, disperses on the inner periphery of the diversion section and passes through the obstruction; The blocked liquid clumps are discharged under the action of the recovery section.

[0012] Furthermore, it also includes the following steps: The dust-laden gas passes through the dust removal component and then enters the demisting component for drying.

[0013] Furthermore, it also includes the following steps: The clump of liquid is collected by the recovery section and sent to the sedimentation tank; Water and impurities are separated in the sedimentation tank; The water storage tank draws clean water and delivers it to the spray section.

[0014] Furthermore, it also includes the following steps: The water collected by the demisting component enters the sedimentation tank.

[0015] The advantages of this invention over the prior art are as follows: 1) It uses pre-spraying and rotary dehydration to eliminate the impact of steam transport of hot steel slag on the pipeline; 2) It utilizes the purification system (400) to achieve water circulation; 3) It achieves deep cleaning and step-by-step purification by using the demisting component. Attached Figure Description

[0016] Figure 1 This is a front view of a specific embodiment of the present invention; Figure 2 This is a detailed view of the spray section to the rotating section according to a specific embodiment of the present invention; Figure 3 This is a rotating segment axial view of a specific embodiment of the present invention; Figure 4 This is a simulation diagram of airflow motion in a specific embodiment of the present invention; The annotation is represented as follows: 100 - Hot sump; 110 - Gas collection section; 200 - Dust removal component; 210 - Acceleration section; 220 - Deceleration section; 230 - Rotation section; 231 - Air-breaking cone; 240 - Flow diversion section; 250 - Recovery section; 260 - Spray section; 261 - Inspection port; 300 - Defogging component; 400 - Purification system; 410 - Sedimentation tank; 420 - Water storage tank; Detailed Implementation

[0017] The technical solutions in the embodiments are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] To overcome the problems in existing technologies, this invention employs a primary dust removal pre-filter to remove the vast majority of coarse particles, keeping the dust collection pipeline clean. Compared to traditional wet dust removal, it eliminates the need for continuous spray nozzles along the entire pipeline, thus protecting the transport pipeline. Please refer to [link / reference]. Figures 1 to 4 The specific implementation method is as follows: a steel slag hot quenching dust removal system, comprising: Hot simmering pool 100; The gas collection section 110 is a pipe section for collecting the dust-containing gas generated by the hot sump 100. It should be noted that the length of the front end should be shortened as much as possible to avoid clogging the pipe. Therefore, the gas collection section 110 only provides the collection function. After this function is achieved, it will immediately move to the next section.

[0019] The demisting assembly 200 is a component for eliminating water vapor; in this embodiment, the demisting assembly 200 is a high-efficiency demister that utilizes centrifugal separation.

[0020] A dust removal component 200 is included between the gas collection section 110 and the demisting component 200, the dust removal component 200 comprising: The spray section 260 is connected to the gas collection section 110 and sprays water vapor toward the dust-laden gas. It should be noted that this section is only a single section of spraying water vapor, which is different from the traditional spraying method. It only provides a carrier that can capture impurities.

[0021] Acceleration section 210, which is connected to spray section 260, increases the flow velocity of the dust-laden gas by means of narrowing, so that the water vapor and the particles in the dust-laden gas collide and mix to form a liquid clump. The deceleration section 220 is a pipe section that reduces the flow velocity of the dust-laden gas by means of an increased diameter, in order to connect with the acceleration section 210. The above two paragraphs describe the principle of thoroughly mixing water vapor and impurities, similar to a venturi tube, but with the addition of a dust collector at the front end. This is the core invention of this embodiment, demonstrating the pre-positioning of dust removal.

[0022] Rotating section 230 is a pipe section connected to the deceleration section 220, which causes the dust-laden gas to rotate. The diversion section 240 is connected to the rotating section 230 and is a tube section that separates the liquid clumps that are attached to the side wall of the rotating section 230 after centrifugation. The inner sleeve of the diversion section 240 is a truncated cone tube section that narrows towards the direction of the dust-laden gas, separating the clean airflow in the center of the dust-laden gas from the dust-laden liquid clumps on the periphery; The recovery section 250 is connected to the diversion section 240 and collects the clumps of liquid that have gathered under the action of gravity.

[0023] In some embodiments, preferably, an independent water circulation system is provided, further comprising: Purification system 400 is a water purification system; The purification system 400 is connected to the recovery section 250, the demisting component 200, and the spray section 260 respectively, purifying the collected dust-containing liquid and simultaneously providing water vapor to the spray section 260 to achieve independent circulation.

[0024] Preferably, the purification system 400 includes: Sedimentation tank 410 separates water and impurities through sedimentation. Water storage tank 420, extracts the surface clean water from the sedimentation tank 410; The recovery section 250 and the demisting component 200 are connected to the sedimentation tank 410; The spray section 260 is connected to the water storage tank 420.

[0025] Preferred, The demisting component 200 is a demister.

[0026] In other embodiments, in order to improve the centrifugation efficiency of dust-laden water vapor, The rotating section 230 includes a wind-breaking cone 231 and fan blades facing the direction of the dust-laden gas; The air-breaking cone 231 guides the dust-laden gas to separate to the periphery and rotates centrifugally.

[0027] In other embodiments, please refer to Figure 2 For ease of maintenance, The spray section 260 includes a laterally openable inspection port 261.

[0028] Based on the above system, this embodiment proposes a method for using a steel slag hot quenching dust removal system, including the following steps: The gas collection section 110 collects the dust-laden gas in the hot sump 100 and transports it to the spray section 260; The spray section 260 sprays the water vapor along the flow direction of the dust-laden gas at an angle greater than the maximum diameter of the acceleration section 210. The water vapor and the particles in the dust-laden gas collide and mix in the acceleration section 210 to form the liquid agglomeration. The liquid mass enters the rotating section 230 and, under the action of centrifugal force, disperses on the inner periphery of the diversion section 240, and is blocked from passing through. The blocked liquid clumps are discharged under the action of the recovery section 250.

[0029] In other embodiments, a multi-level redundant dust removal system can also be designed, further including the following steps: The dust-laden gas passes through the dust removal component 200 and then enters the demisting component 200 for drying.

[0030] Preferably, in some embodiments, water circulation further includes the following steps: The clump liquid is collected by the recovery section 250 and sent to the sedimentation tank 410; Water and impurities are separated in the sedimentation tank 410; The water storage tank 420 draws clean water and delivers it to the spray section 260.

[0031] Preferably, the following steps are also included: The water collected by the demisting component 200 enters the sedimentation tank 410.

[0032] In specific operation: Dust-laden flue gas is generated in the hot sump 100, collected and discharged via the gas collection section 110, and then enters the spray section 260. The spray section 260 mixes impurities with water vapor, which then collides in the acceleration section 210, forming large clumps of liquid. The rotation section 230 centrifuges the clumps containing impurities to the periphery. Utilizing the structure of the diversion section 240, the gas with less dust and impurities in the middle passes through, while the clumps on both sides are discharged via the recovery section 250. Please refer to [link to relevant documentation]. Figure 4 The system's discharge pattern and effect were simulated. Experiments showed that the filtration efficiency for medium and coarse dust particles larger than 40 micrometers reached 92%, and the filtration efficiency for fine dust particles larger than 10 micrometers was 63%, effectively solving the problem of dust and sludge clogging in pipes. The filtration efficiency for ultrafine dust was slightly lower, at only 45%, but the overall equipment had low resistance and a simple structure that was easy to maintain.

[0033] The gas discharged from the diversion section 240 still contains some water vapor or fine dust impurities. Secondary dust removal can be established by adding a demisting component 200 at the rear end to further eliminate the fine dust and achieve the purpose of dust removal.

[0034] In terms of water circulation, the recovery section 250 collects water containing impurities and discharges it to the purification system 400. Dust is removed using a sedimentation tank 410, and the clean water is pumped to a storage tank 420, which can also supply water to the spray section 260. Simultaneously, in the secondary dust removal process, the impurity water in the demisting component 200 can also be discharged to the sedimentation tank 410, achieving self-circulation. The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steel slag hot quenching dust removal system, characterized in that, include: Hot tub (100); The gas collection section (110) is a pipe section for collecting the dust-laden gas generated by the hot sump (100); Defogging assembly (200) is an assembly for eliminating water vapor; A dust removal assembly (200) is included between the gas collection section (110) and the demisting assembly (200), the dust removal assembly (200) comprising: The spray section (260) is connected to the gas collection section (110) and sprays water vapor toward the dust-laden gas; The acceleration section (210) is a pipe section that, in order to connect with the spray section (260), increases the flow rate of the dust-laden gas by means of a narrowing diameter, so that the water vapor and the particles in the dust-laden gas collide and mix to form a liquid clump. The deceleration section (220) is a pipe section that reduces the flow velocity of the dust-laden gas by means of an expansion diameter in order to connect with the acceleration section (210); The rotating section (230) is a pipe section connected to the deceleration section (220) to rotate the dust-laden gas; The diversion section (240) is connected to the rotating section (230) and is a tube segment that separates the liquid clumps that are attached to the side wall of the rotating section (230) after centrifugation. The inner sleeve of the diversion section (240) is a truncated cone tube section that narrows towards the direction of the dust-laden gas, separating the clean airflow in the center of the dust-laden gas from the dust-laden liquid clumps on the periphery; The recovery section (250) is connected to the diversion section (240) and collects the clumps of liquid that have gathered under gravity.

2. The steel slag hot quenching dust removal system according to claim 1, characterized in that, Also includes: The purification system (400) is a system for purifying water; The purification system (400) is connected to the recovery section (250), the demisting component (200), and the spray section (260) respectively, purifying the collected dust-containing liquid and providing the water vapor to the spray section (260) to achieve independent circulation.

3. The steel slag hot quenching dust removal system according to claim 2, characterized in that, The purification system (400) includes: Sedimentation tank (410) separates water and impurities by means of sedimentation; Water storage tank (420) is used to extract clean water from the surface of the sedimentation tank (410); The recovery section (250) and the demisting component (200) are connected to the sedimentation tank (410); The spray section (260) is connected to the water storage tank (420).

4. The steel slag hot quenching dust removal system according to claim 1, characterized in that, The demisting component (200) is a demister.

5. The steel slag hot quenching dust removal system according to claim 1, characterized in that, The rotating section (230) includes a wind-breaking cone (231) and fan blades facing the direction of the dust-laden gas; The air-breaking cone (231) guides the dust-laden gas to separate to the periphery and rotate centrifugally.

6. The steel slag hot quenching dust removal system according to claim 1, characterized in that, The spray section (260) includes a laterally openable inspection port (261).

7. The method of using the steel slag hot quenching dust removal system according to any one of claims 1 to 6, characterized in that, Includes the following steps: The gas collection section (110) collects the dust-laden gas in the hot sump (100) and transports it to the spray section (260). The spray section (260) sprays water vapor along the flow direction of the dust-laden gas at an angle greater than the maximum diameter of the acceleration section (210); The water vapor and the particles in the dust-laden gas collide and mix in the acceleration section (210) to form the liquid mass; The liquid mass enters the rotating section (230) and, under the action of centrifugal force, disperses on the inner periphery of the diversion section (240) and passes through the obstruction; The blocked liquid clumps are discharged under the action of the recovery section (250).

8. The method of using the steel slag hot quenching dust removal system according to claim 7, characterized in that, It also includes the following steps: The dust-laden gas passes through the dust removal component (200) and then enters the demisting component (200) for drying.

9. The method of using the steel slag hot quenching dust removal system according to claim 7, characterized in that, It also includes the following steps: The clump of liquid is collected by the recovery section (250) and sent to the sedimentation tank (410). Water and impurities are separated in the sedimentation tank (410); The water storage tank (420) draws clean water and delivers it to the spray section (260).

10. The method of using the steel slag hot quenching dust removal system according to claim 8, characterized in that, It also includes the following steps: The water collected by the demisting component (200) enters the sedimentation tank (410).

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