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2020
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09
Dust Control Solution for Steel Mill Ore Bin Dry‑Mist Dust Removal System – AoGong Solution
Author:
Oxygen spray
Dust Control Plan for the Dry-Mist Dust Removal System of the Ore Bin
The excessive dust concentrations in steel plant hopper systems are primarily due to the significant drop height when materials enter the bin, which generates substantial airborne dust. Some of this dust escapes through gaps in the feed‑inlet seals. Meanwhile, the accompanying mobile ventilation system is designed only to capture dust generated by the unloading carts themselves and fails to capture the dust produced inside the bin, resulting in uncontrolled fugitive emissions.
For dust control in steel plant ore bins, Aogong Spray Equipment Co., Ltd. recommends dry‑mist dust suppression technology. This technology is based on the physical principle of nucleation and condensation: due to surface tension, extremely fine dust particles will only agglomerate into larger clusters when the water droplets are very small or when chemical additives—such as surfactants—are introduced. If the diameter of the mist droplets is much larger than that of the dust particles, the dust will merely follow the airflow around the droplets without adhering to their surfaces. However, when the mist droplet size approaches that of the dust particles, the dust can easily collide with, come into contact with, and adhere to the droplets during airflow, causing the dust aggregates to grow heavier and eventually settle, thereby effectively suppressing dust emissions. The atomization mechanism involves mixing high‑pressure gas with water; as the two‑phase gas–liquid flow exits through the annular dry‑mist nozzle, the high gas velocity (200–340 m/s) combined with the relatively low liquid velocity creates a substantial relative velocity between the phases, generating significant friction. The gas stream exerts strong tearing and shearing forces on the liquid, atomizing it into a fine mist. The resulting mixed two‑phase flow then impinges on the diffuser, further accelerating the gas and enhancing atomization through secondary impact. At an air pressure of 0.6 MPa, more than 50% of the atomized droplets have diameters below 10 μm, enabling dust particles to adhere to one another, aggregate, and grow in size before settling under gravity. While water can bind and coalesce even the finest dust, only very small droplets—reduced in size to lower surface tension—can effectively promote agglomeration. As the mist droplets become progressively smaller, the likelihood of aggregation increases, leading to larger, more readily settleable dust clusters, thus establishing the dust‑filtering effect of the mist.
The dry‑mist dust suppression system for steel plant ore bins is driven by compressed air to activate a sonic oscillator, which uses high‑frequency sound waves to atomize water under high pressure, generating water droplets measuring 3–10 μm in size. The compressed air then passes through the resonant chamber of the dry‑mist nozzle, projecting these fine droplets as a soft, low‑velocity mist directly onto the dust‑generating source. This causes the dust particles to agglomerate and settle, thereby achieving effective dust suppression.
The installed dry‑mist dust suppression and removal system has demonstrated excellent performance over many years of operation, effectively controlling workplace dust. Sampling and analysis reveal that 93% of sampled locations meet the required dust concentration standards, with a dust removal efficiency exceeding 95%, resulting in a clearly noticeable reduction in airborne particulate matter.
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