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Dry-mist dust removal system for steel plant ore bins
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Dry-mist dust removal system for steel plant ore bins
I. Overall Analysis of Dust Control in Steel Plant Ore Bins
The most significant source of fugitive emissions in the steel plant area is dust generated during the unloading process, when material-handling cars transfer materials into elevated storage silos. In the past, these unloading cars… 90% A lightweight discharge cart is used, with no accompanying dust-collection equipment; during discharge from the trough, dust is stirred up as the material falls. The maximum dust concentration can reach 1000mg/m3, The vast majority is 10 mu m The following respirable dust results in poor visibility within the workshop. 20m, The floor is piled high. 10cm The aforementioned dust. In recent years, in response to this issue, various measures have been implemented, such as installing mobile ventilation ducts on discharge cars to capture and extract the dust, and using rubber belts to seal the discharge openings. Although these approaches have reduced on-site dust levels to some extent, field measurements during unloading still reveal that the dust concentration at the workstations remains as high as… 50mg/m3 , exceeding the national standard.
The iron ore produced in the steel plant’s ore bins is transported by rail to the unloading car dumper at the beneficiation plant, where it undergoes crushing, screening, and other processing steps to reduce its particle size from… 20~300mm Crushed to 13~20mm, Through the transfer station, the discharge hopper, and the belt conveyor, the ore particles are conveyed to the main production building of the concentrator for processes such as magnetic separation and flotation. On-site investigations revealed that the excessive dust concentrations in the ore‑handling trough are primarily attributable to the significant drop height of materials as they descend into the storage bin, which generates substantial airborne dust. Some of this dust escapes through gaps in the feed‑port seals. Meanwhile, the accompanying mobile ventilation system is designed to capture dust generated by the unloading vehicle itself but fails to capture the dust within the bin, resulting in uncontrolled fugitive emissions.
II. Dust Control Solutions for Steel Mill Ore Bins
Dry-mist dust removal technology:
Based on the operating conditions and emission‑control requirements of steel plants, for dust control in ore bins, Aogong Spraying recommends dry‑mist dust suppression technology. This technology is grounded in the physical principle of nucleation and condensation: because water droplets exhibit surface tension, extremely fine dust particles will only agglomerate into larger clusters when the droplets are very small or when chemical agents—such as surfactants—are added. 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 is comparable to the dust particle size, the dust particles, carried by the airflow, can readily collide with, come into contact with, and adhere to the droplets, causing the dust aggregates to grow and eventually settle, thereby effectively suppressing fugitive dust. 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 velocity of the gas… 200~340 m/s), Meanwhile, the liquid flow rate is low, resulting in a substantial relative velocity between the two fluids and generating significant friction. The gas stream exerts strong tearing and shearing forces on the liquid, causing it to be atomized and sprayed out as a dust-suppression mist. The resulting two-phase mixture impacts the diffuser head, further increasing the gas velocity and enhancing the atomization effect, thereby producing secondary impact atomization under pneumatic pressure. 0.6MPa Below, more than 50% The diameter of the atomized particles can reach 10 mu m The fine water droplets below cause dust particles to adhere to one another, forming larger agglomerates that settle under their own weight. Dust can be bound and aggregated by water; however, only the finest particles will coalesce into clusters when the water droplets are extremely small, thereby reducing surface tension. As the mist droplets become progressively smaller, the likelihood of agglomeration increases, and the resulting dust aggregates grow in size and density, making them readily fall out of suspension. Thus, the filtering effect of the water mist on dust is established.
The dry‑mist dust suppression system for steel plant ore bins is driven by compressed air to operate a sonic oscillator, which uses high‑frequency sound waves to atomize water under high pressure, generating… 3~10 mu m Water droplets of varying sizes are generated, and compressed air passes through the resonant chamber of a dry‑mist nozzle to atomize them into a soft, low‑velocity mist that is sprayed directly at the dust‑generation source. This causes the dust particles to agglomerate and settle, thereby achieving dust suppression.
The installed dry‑mist dust suppression system has operated for one year with excellent performance, effectively controlling dust at the workstations. Sampling and testing of dust concentrations at these stations have shown a compliance rate of 93% . Dust removal rate reaches Over 95%, with a significant dust removal effect.
III. Technical Advantages of the Dry-Mist Dust-Removal System for Steel Mill Ore Bins
◆ Compact size, easy installation, energy-efficient
◆ Low operating and maintenance costs
◆ Excellent dust removal performance
◆ Low investment
◆ Low energy consumption
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