A wet dust removal device for steelmaking slag fume
Patent Information
- Application Number
- CN202521917250.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-07
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-07
AI Technical Summary
目前，许多企业采用无组织排放的方式，在渣跨区域造成雾气弥漫，严重影响大气环境，同时弥漫的水蒸气还会腐蚀钢结构，存在安全隐患；其次，有的企业会采用洗涤塔喷淋的方式，通过喷雾洗涤的方式除去烟气中的粉尘，但存在除尘效率低和除尘效果差的问题，处理后还是不能很好的满足排放要求
[0011]本实用新型在使用时，可利用捕气罩等集气装置对炼钢焖渣时产生的烟尘进行捕集，预先在除尘塔内的水槽和底部通入一定量的除尘用水，并向中心水管中通入除尘用水，实际使用时，可采用碱性水，使得喷淋水与水槽下水管排出的水量相当，确保水槽内水位稳定，然后通过进气管将焖渣烟尘通入除尘塔底部的水中，烟气中的部分粉尘等杂质被水吸收，完成第一次烟气除尘，随后烟气向上流动，经L形通气管进入最下方一个水槽内，与该水槽内的水接触，再一次进行烟气的除尘，最后继续向上流动，依次进入多个水槽，烟气得到多次除尘，随后向上流动依次与多层喷淋管喷出的水雾逆向接触，再次除去烟气中的粉尘等杂质，最后送入湿电除尘器，进一步去除烟气中的微细粉尘，达到炼钢焖渣烟尘的除尘目的。在本实用新型中，烟气先喷入除尘塔底部的水中，再依次分别喷入各个水槽的水中，分别形成大量的气泡和湍流，烟气与水剧烈混合，粉尘通过惯性碰撞、扩散、截留等机制被快速捕获，采用了冲击除尘的原理，使烟气能够被充分的冲击，进而将粉尘分离出来，结构简单，除尘成本较低，随后采用喷淋除尘的方式，进一步对烟气进行除尘处理，最后使用湿电除尘器除去烟气中微细粉尘，三种除尘方式相结合，具有较高的除尘效率和除尘效果，且运行指标稳定，解决了目前采用无组织排放和常规湿法除尘技术粉尘排放无法达标的问题，处理后的气体能够满足排放要求，不会造成周边区域的环境污染，更不会腐蚀钢结构，更加安全环保。综上所述，本实用新型具有除尘效率高，除尘效果好，安全环保的优点。
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Figure CN224736449U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dust removal technology for slag removal in steelmaking, specifically to a wet dust removal device for slag removal in steelmaking. Background Technology
[0002] During the steelmaking process, a large amount of molten solid waste, namely steel slag, is generated. Slag blanching is a process for treating steel slag. During slag blanching, the high-temperature steel slag of 1400-1600℃ is slowly cooled in a closed or semi-closed environment by controlling the cooling conditions, which promotes the sedimentation and separation of iron particles in the steel slag, and at the same time stabilizes the physicochemical properties of the steel slag. This process usually uses water spraying to blanch the steel slag, which causes the steel slag to expand and break, making it easier for subsequent crushing, recovery of metallic iron and other recyclable materials.
[0003] The slag-quenching process in steelmaking generates a large amount of dust, primarily composed of particulate matter such as CaO, SiO2, MgO, S, and MnO, as well as substantial amounts of water vapor. Currently, many enterprises employ fugitive emission methods, causing widespread fog in the slag-quenching area, severely impacting the atmospheric environment. Furthermore, the diffused water vapor corrodes steel structures, posing safety hazards. Secondly, some enterprises use scrubbing towers to remove dust from the flue gas through spray washing, but this method suffers from low dust removal efficiency and poor dust removal effect, failing to adequately meet emission requirements even after treatment. Therefore, the development of a high-efficiency, effective, safe, and environmentally friendly wet dust removal device for steelmaking slag-quenching flue gas is objectively necessary. Utility Model Content
[0004] The purpose of this utility model is to provide a wet dust removal device for steelmaking slag dust that is highly efficient, effective, safe and environmentally friendly.
[0005] The purpose of this utility model is achieved as follows: it includes a dust removal tower and a wet electrostatic precipitator. The dust removal tower has multiple isolation ring plates arranged vertically at intervals inside. A water tank is fixed inside the isolation ring plates. Multiple L-shaped vent pipes are evenly distributed around the upper circumference of the side wall of the water tank. The ends of the L-shaped vent pipes extend downward into the lower part of the water tank. A drain pipe is provided at the bottom of the water tank. An air inlet pipe is provided at the lower part of the dust removal tower. The end of the air inlet pipe extends into the dust removal tower and then bends downward. A central water pipe is provided at the upper part of the dust removal tower. Multiple spray pipes are arranged vertically at intervals on the central water pipe. The top of the dust removal tower is connected to the wet electrostatic precipitator through an exhaust pipe.
[0006] Furthermore, a rotating shaft is concentrically arranged inside the dust removal tower, which runs through each water tank and is sealed to the water tank for rotation. The lower end of the rotating shaft is connected to a motor installed at the bottom of the dust removal tower. Swirl blades are installed on the rotating shaft between the air inlet pipe and the lowest water tank, between two adjacent water tanks, and between the spray pipe and the highest water tank.
[0007] Furthermore, agitators are installed on the shaft below the air intake pipe and on the shaft in each water tank, with the agitators in the water tank located below the L-shaped air vent pipe.
[0008] Furthermore, the bottom of the dust removal tower is connected to a sedimentation and filtration tank, and the upper layer of the sedimentation and filtration tank is connected to the central water pipe through a circulation pipe.
[0009] Furthermore, the drain outlet of the wet electrostatic precipitator is connected to the sedimentation and filtration tank via pipeline.
[0010] Furthermore, a hollow air disc is provided at the end of the air intake pipe, and several air jet holes are provided on the lower surface of the air disc.
[0011] In use, this invention utilizes gas collection devices such as gas traps to capture the dust generated during steelmaking slag curing. A certain amount of dust-removing water is pre-circulated into the water tank and bottom of the dust removal tower, and also into the central water pipe. In actual use, alkaline water can be used to ensure that the spray water volume is equivalent to the water discharged from the water tank's drain pipe, thus maintaining a stable water level in the tank. Then, the slag curing dust is introduced into the water at the bottom of the dust removal tower through the air inlet pipe. Some dust and other impurities in the flue gas are absorbed by the water, completing the first dust removal process. Subsequently, the flue gas flows upwards, entering the lowest water tank through an L-shaped ventilation pipe, where it comes into contact with the water for another round of dust removal. Finally, it continues to flow upwards, entering multiple water tanks in sequence, undergoing multiple dust removal processes. Then, it flows upwards again, coming into counter-current contact with the water mist sprayed from multiple layers of spray pipes, further removing dust and other impurities. Finally, it is sent to a wet electrostatic precipitator for further removal of fine dust, achieving the dust removal purpose for steelmaking slag curing dust. In this invention, flue gas is first injected into the water at the bottom of the dust removal tower, and then sequentially injected into the water in each of the individual tanks, forming a large number of bubbles and turbulence. The flue gas and water mix violently, and dust is rapidly captured through mechanisms such as inertial collision, diffusion, and interception. The principle of impact dust removal is employed, ensuring the flue gas is fully impacted, thereby separating the dust. The structure is simple and the dust removal cost is low. Subsequently, spray dust removal is used to further treat the flue gas. Finally, a wet electrostatic precipitator is used to remove fine dust from the flue gas. The combination of these three dust removal methods results in high dust removal efficiency and effect, with stable operating indicators. It solves the problem of uncontrolled emissions and the inability of conventional wet dust removal technologies to meet emission standards. The treated gas meets emission requirements, does not cause environmental pollution to the surrounding area, and does not corrode steel structures, making it safer and more environmentally friendly. In summary, this invention has the advantages of high dust removal efficiency, good dust removal effect, and safety and environmental protection. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1-Dust removal tower, 2-Wet electrostatic precipitator, 3-Isolation ring plate, 4-Water tank, 5-L-shaped vent pipe, 6-Drain pipe, 7-Air inlet pipe, 8-Central water pipe, 9-Spray pipe, 10-Rotating shaft, 11-Motor, 12-Swirl vane, 13-Agitator, 14-Sedimentation filter tank, 15-Circulation pipe, 16-Air plate. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.
[0014] like Figure 1 As shown, this utility model includes a dust removal tower 1 and a wet electrostatic precipitator 2. The wet electrostatic precipitator 2 is an existing device used to remove fine dust from flue gas. The dust removal tower 1 has multiple isolation ring plates 3 arranged vertically at intervals inside. A water tank 4 is fixed inside the isolation ring plates 3. Multiple L-shaped ventilation pipes 5 are evenly distributed around the upper circumference of the side wall of the water tank 4. The ends of the L-shaped ventilation pipes 5 extend downward into the lower part of the water tank 4. A drain pipe 6 is provided at the bottom of the water tank 4. An air inlet pipe 7 is provided at the lower part of the dust removal tower 1. The end of the air inlet pipe 7 extends into the dust removal tower 1 and then bends downward. A central water pipe 8 is provided at the upper part of the dust removal tower 1. Multiple spray pipes 9 are arranged vertically at intervals on the central water pipe 8. The top of the dust removal tower 1 is connected to the wet electrostatic precipitator 2 through an exhaust pipe.
[0015] In use, this invention utilizes a gas collection device such as a gas trap to collect the dust generated during the slag-collecting process in steelmaking. A certain amount of dust-collecting water is pre-circulated into the water tank 4 and bottom of the dust removal tower 1, and also into the central water pipe 8. In actual use, alkaline water can be used to ensure that the spray water volume is equivalent to the water discharged from the drain pipe 6 of the water tank 4, thus maintaining a stable water level in the water tank 4. Then, the slag-collecting dust is introduced into the water at the bottom of the dust removal tower 1 through the air inlet pipe 7. Some of the dust and other impurities in the flue gas are absorbed by the water. The flue gas undergoes its first dust removal process. It then flows upwards through the L-shaped ventilation pipe 5 into the lowest water tank 4, where it comes into contact with the water for another dust removal. Continuing upwards, it enters multiple water tanks 4 in sequence, receiving multiple dust removal treatments. The flue gas then flows upwards again, coming into counter-current contact with the water mist sprayed from the multi-layer spray pipes 9, further removing dust and other impurities. Finally, it is sent to the wet electrostatic precipitator 2 for further removal of fine dust, achieving the dust removal purpose for steelmaking slag dust.
[0016] In this invention, flue gas is first injected into the water at the bottom of the dust removal tower 1, and then sequentially injected into the water in each of the water tanks 4, forming a large number of bubbles and turbulence. The flue gas and water are violently mixed, and the dust is quickly captured through mechanisms such as inertial collision, diffusion, and interception. The principle of impact dust removal is adopted, which allows the flue gas to be fully impacted, thereby separating the dust. The structure is simple and the dust removal cost is low. Subsequently, spray dust removal is used to further treat the flue gas. Finally, a wet electrostatic precipitator 2 is used to remove fine dust from the flue gas. The combination of the three dust removal methods has high dust removal efficiency and effect, and stable operating indicators. It solves the problem that the dust emissions cannot meet the standards when using fugitive emissions and conventional wet dust removal technology. The treated gas can meet the emission requirements, will not cause environmental pollution in the surrounding area, and will not corrode the steel structure, making it safer and more environmentally friendly.
[0017] A rotating shaft 10 is concentrically arranged inside the dust removal tower 1. The rotating shaft 10 passes through each water tank 4 and is sealed and rotatably connected to the water tank 4. The lower end of the rotating shaft 10 is connected to the motor 11 installed at the bottom of the dust removal tower 1. Swirl blades 12 are provided on the rotating shaft 10 between the air inlet pipe 7 and the lowest water tank 4, between two adjacent water tanks 4, and between the lowest spray pipe 9 and the highest water tank 4. During operation, the motor 11 is started, which drives the rotating shaft 10 to rotate. The rotating shaft 10 drives the swirl blades 12 to rotate. When the swirl blades 12 rotate, they have two main functions: First, when rotating, the surface of the swirl blades 12 collides with the dust and moisture in the flue gas. The dust and moisture have a large mass. When the dust collides with the swirl blades 12, it will separate from the airflow, while the moisture will adhere to the swirl blades 12 and continuously accumulate. At the same time, it will adsorb a certain amount of dust and then be thrown out by the swirl blades 12, ultimately playing a role in dust removal. Second, the swirl blades 12 can drive the airflow to rotate, so that the airflow forms a swirl, and remove the dust and moisture in it by using the purpose of spiral dust removal.
[0018] Agitator 13 is installed on the rotating shaft 10 below the air inlet pipe 7 and on the rotating shaft 10 in each water tank 4. The agitator 13 in the water tank 4 is located below the L-shaped air vent pipe 5. The agitator 13 can agitate the water, making the water flow, expanding the contact area between the flue gas and the water, so that all parts of the water can come into contact with the flue gas, thereby improving the dust removal efficiency of the flue gas.
[0019] The bottom of the dust removal tower 1 is connected to a sedimentation and filtration tank 14. The upper layer of the sedimentation and filtration tank 14 is connected to the central water pipe 8 through a circulation pipe 15. The sedimentation and filtration tank 14 is an existing device that can perform sedimentation and filtration treatment on sewage to remove various pollutants from the water. The water is then returned to the central water pipe 8 through the circulation pipe 15 for recycling, thereby improving the utilization rate of water resources.
[0020] The sewage outlet of the wet electrostatic precipitator 2 is connected to the sedimentation filter tank 14 through a pipeline. When the wet electrostatic precipitator 2 is working, it will discharge sewage containing a large amount of dust, which will be fed into the sedimentation filter tank 14 for unified treatment. The water in the tank will be recycled and reused to improve the utilization rate of water resources.
[0021] A hollow air plate 16 is provided at the end of the air inlet pipe 7. Several air jet holes are provided on the lower surface of the air plate 16. When in use, the flue gas enters the air plate 16 through the air inlet pipe 7 and is then ejected from the air jet holes. The flue gas impacts the water at a high speed, causing the airflow direction to change drastically. Dust is captured by colliding with the water due to inertia. Compared with the method of directly ejecting the flue gas from the air inlet pipe 7, this method allows the flue gas to be sprayed into the water more dispersedly, with a larger contact area with the water. The flow area of the air jet holes is smaller, which can appropriately increase the flow velocity and thus improve the dust removal effect.
Claims
1. A wet dust removal device for slag dust in steelmaking, comprising a dust removal tower (1) and a wet electrostatic precipitator (2), characterized in that: The dust removal tower (1) is equipped with multiple isolation ring plates (3) spaced vertically inside. A water tank (4) is fixed on the inner side of the isolation ring plate (3). Multiple L-shaped ventilation pipes (5) are evenly distributed on the upper circumference of the side wall of the water tank (4). The ends of the L-shaped ventilation pipes (5) extend downward into the lower part of the water tank (4). A drain pipe (6) is provided at the bottom of the water tank (4). An air inlet pipe (7) is provided at the lower part of the dust removal tower (1). The end of the air inlet pipe (7) extends into the dust removal tower (1) and then bends downward. A central water pipe (8) is provided at the upper part of the dust removal tower (1). Multiple spray pipes (9) are arranged vertically on the central water pipe (8). The top of the dust removal tower (1) is connected to the wet electrostatic precipitator (2) through an exhaust pipe.
2. The wet dust removal device for steelmaking slag dust according to claim 1, characterized in that: The dust removal tower (1) is concentrically equipped with a rotating shaft (10), which passes through each water tank (4) and is sealed and rotatably connected to the water tank (4). The lower end of the rotating shaft (10) is connected to the motor (11) installed at the bottom of the dust removal tower (1). Swirl blades (12) are provided on the rotating shaft (10) between the air inlet pipe (7) and the lowest water tank (4), between two adjacent water tanks (4), and between the lowest spray pipe (9) and the highest water tank (4).
3. A wet dust removal device for steelmaking slag dust according to claim 2, characterized in that: Agitator (13) is provided on the shaft (10) below the air inlet pipe (7) and on the shaft (10) in each water tank (4). The agitator (13) in the water tank (4) is located below the L-shaped air pipe (5).
4. A wet dust removal device for steelmaking slag dust according to claim 1, characterized in that: The bottom of the dust removal tower (1) is connected to a sedimentation filter tank (14), and the upper layer of the sedimentation filter tank (14) is connected to the central water pipe (8) through a circulation pipe (15).
5. A wet dust removal device for steelmaking slag dust according to claim 4, characterized in that: The drain outlet of the wet electrostatic precipitator (2) is connected to the sedimentation filter tank (14) via a pipeline.
6. A wet dust removal device for steelmaking slag dust according to claim 1, characterized in that: The end of the air intake pipe (7) is provided with a hollow air disc (16), and the lower surface of the air disc (16) is provided with a number of air jet holes.