Methods for Dust Suppression and Emission Reduction in Steelmaking Continuous Casting Slag Discharge

Abstract

This invention discloses a method for dust suppression and emission reduction during slag dumping in steelmaking continuous casting. The method defines a dust suppression area, constructs an induction zone with a normally open magnetic induction switch within the area of ​​the overhead crane tipping ladle, and installs magnetic blocks on the crane. A remote industrial mist cannon is set up in the slag dumping area. When the crane moves into the tipping area, the magnetic blocks sense the normally open magnetic induction switch, activating the remote industrial mist cannon via a control circuit. The pitch and horizontal rotation angles of the remote industrial mist cannon are adjusted to ensure precise coverage of the slag ladle opening and dust diffusion area. The remote industrial mist cannon targets the center of the slag ladle, forming a continuous, dense arc-shaped mist curtain to envelop the dust generated during slag dumping. After the slag is dumped, the crane leaves the dumping area, the magnetic induction switch is deactivated, and the remote industrial mist cannon resets to standby mode, completing the entire dust suppression operation. This method utilizes mist cannons and magnetic induction technology to achieve comprehensive dust suppression in the slag dumping area, balancing dust suppression with flue gas cooling, and meeting the ultra-low emission requirements of steelmaking operations.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology in the metallurgical industry, and in particular to a method for dust suppression and emission reduction in continuous casting slag discharge during steelmaking. Background Technology

[0002] During the final shutdown phase of a continuous casting machine, when the slag remaining in the ladle is poured into the slag pot by an overhead crane, the high-temperature slag violently collides with the air inside the slag pot, generating a large amount of yellowish-brown dust. This forms a dense dust fog that spreads with the wind, severely polluting the working environment, affecting visibility, and accompanied by slight heat and a pungent odor. If dust suppression measures are not taken in time, it can easily lead to fugitive emissions, placing enormous pressure on on-site cleanliness and environmental management.

[0003] The continuous casting slag removal process generates a large amount of high-temperature dust, flue gas and harmful particulate matter. If dust removal equipment is not provided on site, it will cause obvious drawbacks in many aspects, such as personnel safety, equipment wear and tear, site environment and production management.

[0004] Firstly, it seriously endangers the health of workers. During the slag dumping process, the residual heat of the steel slag evaporates and generates a large amount of metal dust and fumes. Without dust removal measures, these dusts directly permeate the work area. Workers who inhale the dust for a long time are very likely to develop pneumoconiosis and respiratory inflammation. At the same time, the fumes carry harmful gases that irritate the eyes and throat, causing dizziness and chest tightness, significantly increasing occupational health risks and resulting in extremely poor working safety conditions.

[0005] Secondly, it exacerbates equipment damage and on-site corrosion. Floating dust will adhere in large quantities to continuous casting equipment, electrical control cabinets, hydraulic components, and instrument wiring, accelerating mechanical wear, short circuits, and component aging, increasing equipment failure rate and maintenance costs, shortening equipment lifespan, and easily obstructing the operator's view, thus creating potential safety hazards.

[0006] At the same time, it does not comply with environmental protection regulations and on-site management requirements, and the unorganized emission of dust violates relevant regulations on air pollution prevention and control, and is likely to face environmental supervision and penalties. Summary of the Invention

[0007] The technical problem to be solved by this invention is to provide a method for dust suppression and emission reduction in continuous casting slag pouring. This method overcomes the defects of fugitive dust emission in the traditional continuous casting slag pouring process. It uses mist cannons and magnetic induction technology to achieve dust suppression without dead angles in the slag pouring area, taking into account both dust suppression and flue gas cooling, reducing fugitive dust and fine particulate matter emissions, meeting the ultra-low emission requirements of steelmaking operations, and achieving safe and long-term stable operation on site.

[0008] To solve the above-mentioned technical problems, the present invention provides a method for dust suppression and emission reduction in steelmaking continuous casting slag removal, comprising the following steps: Step 1: Confirm that the overhead crane has lifted the slag hopper to the designated slag dumping area, delineate the dust suppression range, and based on the actual on-site measurement of the dust suppression range, make an induction strip with a normally open magnetic induction switch within the range of the overhead crane tipping the slag hopper, and install magnetic blocks on the overhead crane. Step 2: Set up a remote industrial fog cannon in the dumping area. Connect the normally open magnetic induction switch to the control circuit of the remote industrial fog cannon. When the trolley runs to the dumping area, it senses the normally open magnetic induction switch through the magnetic block. The magnetic induction switch changes from normally open to normally closed and starts the remote industrial fog cannon through the control circuit. Step 3: Adjust the pitch angle of the remote industrial fog cannon to match the tilting range of the overhead crane, and set the horizontal rotation angle to a reciprocating angle of 15° to ensure that the sprayed fog screen accurately covers the slag tank opening and the dust diffusion area. Step 4: The remote industrial fog cannon targets the center of the slag tank and slowly rotates horizontally back and forth within a 15° fan-shaped area to form a continuous and dense arc-shaped fog curtain, which envelops the dust generated by dumping slag. Step 5: After the residue is dumped, the overhead crane leaves the dumping area, the magnetic induction switch is turned off, the remote industrial fog cannon stops spraying and rotating, and resets to standby mode, completing the entire dust suppression operation.

[0009] Furthermore, the control circuit of the remote industrial fog cannon is equipped with a delay timer. When the magnetic induction switch changes from normally open to normally closed, the remote industrial fog cannon starts spraying after a delay of 30 seconds, and simultaneously starts a low-speed rotating spray mode at a 15° angle.

[0010] Furthermore, an emergency start / stop button for the remote industrial fog cannon is installed in the slag dumping area for starting and stopping the remote industrial fog cannon under special working conditions.

[0011] Furthermore, the air delivery and fog delivery distance of the remote industrial fog cannon is greater than or equal to 35 meters, and the spray volume is 15 to 30 cubic meters per hour. Because the present invention's method for dust suppression and emission reduction in continuous casting steelmaking adopts the above-mentioned technical solution, namely, this method delineates the dust suppression range, constructs an induction strip with a normally open magnetic induction switch within the range of the overhead crane tipping the slag, and installs magnetic blocks on the overhead crane; a remote industrial mist cannon is set up in the slag dumping area, and when the overhead crane moves to the tipping area, it senses the normally open magnetic induction switch through the magnetic blocks, and starts the remote industrial mist cannon through the control circuit; the pitch angle and horizontal rotation angle of the remote industrial mist cannon are adjusted to ensure that the sprayed mist accurately covers the slag pot opening and the dust diffusion area; the remote industrial mist cannon targets the center of the slag pot, forming a continuous and dense arc-shaped mist curtain to envelop the dust generated by slag dumping; after the slag is dumped, the overhead crane leaves the slag dumping area, the magnetic induction switch is disconnected, and the remote industrial mist cannon resets to standby, completing the entire dust suppression operation. This method overcomes the shortcomings of fugitive dust emissions in the traditional continuous casting slag dumping process. It uses mist cannons and magnetic induction technology to achieve dust suppression without dead angles in the slag dumping area, taking into account both dust suppression and flue gas cooling, reducing fugitive dust and fine particulate matter emissions, meeting the ultra-low emission requirements of steelmaking operations, and achieving safe and long-term stable operation on site. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the slag dumping method for dust suppression and emission reduction in continuous casting steelmaking according to the present invention. Detailed Implementation

[0013] The method for dust suppression and emission reduction in continuous casting steelmaking of the present invention includes the following steps: Step 1: Confirm that the overhead crane 1 will lift the slag tank 2 to the designated slag dumping area, delineate the dust suppression range, and make an induction strip 4 with a normally open magnetic induction switch 3 within the area of ​​the overhead crane 1's tank tipping, and install magnetic blocks 5 on the overhead crane 1. Step 2: Install a remote industrial fog cannon 6 in the dumping area. Connect the normally open magnetic induction switch 3 to the control circuit of the remote industrial fog cannon 6. When the trolley 1 runs to the dumping area, it senses the normally open magnetic induction switch 3 through the magnetic block 5. The magnetic induction switch 3 changes from normally open to normally closed and starts the remote industrial fog cannon 6 through the control circuit. Step 3: Adjust the pitch angle of the remote industrial fog cannon 6 to match the tilting range of the overhead crane 1, and set the horizontal rotation angle to a reciprocating angle of 15° to ensure that the sprayed fog screen accurately covers the opening of the slag tank 2 and the dust diffusion area. Step 4: The remote industrial fog cannon 6 targets the center of the slag tank 2 and slowly rotates horizontally back and forth within a 15° fan-shaped range to form a continuous and dense arc-shaped fog curtain to envelop the dust generated by dumping slag. Step 5: After the residue is dumped, the overhead crane 1 leaves the dumping area, the magnetic induction switch 3 is turned off, the remote industrial fog cannon 6 stops spraying and rotating, and resets to standby mode, completing the entire dust suppression operation.

[0014] Preferably, the control circuit of the remote industrial fog cannon 6 is equipped with a delay timer. When the magnetic induction switch 3 changes from normally open to normally closed, the remote industrial fog cannon 6 starts spraying after a delay of 30 seconds, and simultaneously starts a low-speed rotating spray mode at a 15° angle.

[0015] Since the overhead crane needs to lower the large tank to half a meter above the slag tank below and insert the auxiliary hook into the bottom tilting device of the slag tank when it is performing the slag dumping process in the sensing area, which takes 30 seconds, a delay timer is set to adapt to the slag dumping process to avoid the ineffective activation of the remote industrial fog cannon and interference with other operations.

[0016] Preferably, an emergency start / stop button 7 for the remote industrial fog cannon 6 is installed in the slag dumping area for starting and stopping the remote industrial fog cannon 6 under special working conditions. By setting the emergency start / stop button, the start and stop control of the remote industrial fog cannon can be easily realized. For example, if the remote industrial fog cannon malfunctions when the overhead crane passes through the sensing area, the remote industrial fog cannon can be shut down by using the emergency start / stop button.

[0017] Preferably, the air delivery and fog delivery distance of the remote industrial fog cannon 6 is greater than or equal to 35 meters, and the spray volume is 15 to 30 cubic meters per hour.

[0018] During the dumping process, the high-temperature dust quickly agglomerates and increases in weight when it encounters micron-sized water mist, preventing unorganized diffusion. At the same time, the 15° small-angle rotation of the remote industrial mist cannon ensures that the water mist is concentrated and does not disperse, improving dust suppression efficiency. The control system automatically maintains rotating spray according to the dumping time, keeping the wind speed and water volume stable, and avoiding excessive water mist that could cause water accumulation in the slag tank or equipment slippage.

[0019] The application of this method has the following technical effects: 1. Precise directional jet coverage: Optimizes the wind pressure and nozzle pitch and rotation angles of the remote industrial fog cannon, precisely focusing the fog curtain on the dust source from slag removal, penetrating and completely enveloping dust and smoke clouds without any blind spots; suitable for continuous casting platforms with dense equipment and limited space, without interfering with the main casting and slag removal operations. Low cost.

[0020] 2. Intelligent linkage and precise control: Equipped with online dust monitoring and PLC automatic control system, it automatically starts and stops when slag is dumped and dust is generated, and dynamically adjusts spray pressure and flow rate to achieve dust-free shutdown, saving water and reducing consumption; it is equipped with water filtration and anti-clogging nozzle design to adapt to industrial water quality and reduce the failure rate of scaling and clogging.

[0021] 3. Comprehensive safety and emission reduction management: It takes into account both dust suppression and flue gas cooling, reduces the emission of fugitive dust and fine particulate matter, and meets the ultra-low emission requirements of steelmaking; the equipment is resistant to high temperature and corrosion, avoids water vapor erosion of the furnace body, and takes into account both on-site operation safety and long-term stable operation.

Claims

1. A method for dust suppression and emission reduction in steelmaking continuous casting slag removal, characterized in that... Includes the following steps: Step 1: Confirm that the overhead crane has lifted the slag hopper to the designated slag dumping area, delineate the dust suppression range, and based on the actual on-site measurement of the dust suppression range, make an induction strip with a normally open magnetic induction switch within the range of the overhead crane tipping the slag hopper, and install magnetic blocks on the overhead crane. Step 2: Set up a remote industrial fog cannon in the dumping area. Connect the normally open magnetic induction switch to the control circuit of the remote industrial fog cannon. When the trolley runs to the dumping area, it senses the normally open magnetic induction switch through the magnetic block. The magnetic induction switch changes from normally open to normally closed and starts the remote industrial fog cannon through the control circuit. Step 3: Adjust the pitch angle of the remote industrial fog cannon to match the tilting range of the overhead crane, and set the horizontal rotation angle to a reciprocating angle of 15° to ensure that the sprayed fog screen accurately covers the slag tank opening and the dust diffusion area. Step 4: The remote industrial fog cannon targets the center of the slag tank and slowly rotates horizontally back and forth within a 15° fan-shaped area to form a continuous and dense arc-shaped fog curtain, which envelops the dust generated by dumping slag. Step 5: After the residue is dumped, the overhead crane leaves the dumping area, the magnetic induction switch is turned off, the remote industrial fog cannon stops spraying and rotating, and resets to standby mode, completing the entire dust suppression operation.

2. The method for dust suppression and emission reduction in continuous casting steelmaking according to claim 1, characterized in that: The control circuit of the remote industrial fog cannon is equipped with a delay timer. When the magnetic induction switch changes from normally open to normally closed, the remote industrial fog cannon starts spraying after a delay of 30 seconds, and simultaneously starts a low-speed rotating spray mode at a 15° angle.

3. The method for dust suppression and emission reduction in steelmaking continuous casting slag removal according to claim 1 or 2, characterized in that: An emergency start / stop button for the remote industrial fog cannon is installed in the slag dumping area for starting and stopping the remote industrial fog cannon under special working conditions.

4. The method for dust suppression and emission reduction in steelmaking continuous casting slag removal according to claim 1 or 2, characterized in that: The aforementioned long-range industrial fog cannon has an air delivery and fog delivery distance of 35 meters or more, and a spray volume of 15 to 30 cubic meters per hour.

Images