{"id":4707,"date":"2024-03-01T14:04:14","date_gmt":"2024-03-01T05:04:14","guid":{"rendered":"https:\/\/www.dry-fog.com\/th\/?post_type=technical-report&p=4707"},"modified":"2024-06-28T15:00:51","modified_gmt":"2024-06-28T06:00:51","slug":"dust-002","status":"publish","type":"technical-report","link":"https:\/\/www.dry-fog.com\/th\/projects-technology\/technical-report\/dust-002\/","title":{"rendered":"Dust Control Solutions Using Spray Nozzles | High-velocity Fog Version"},"content":{"rendered":"
Dust Control Solutions Using Spray Nozzles: Two Versions of the System<\/div>\n

IKEUCHI, an industrial spray nozzle manufacturer, provides dust control solutions that effectively suppress airborne dust dispersion and prevent dust eruptions using the fogs generated by its spray nozzles.<\/p>\n

To design and provide a system suited to the specific environment of a facility, there are two main versions of the system. One is a \u201csoft fog design\u201d that sprays fine and soft fog to settle airborne dust and suppress dispersing. The other one is a \u201chigh-velocity fog design\u201d that sprays a large volume of semi-fine fog at high velocity directly at the point where the dust is generated to prevent dust from bursting into the environment.<\/p>\n

Both designs are already used in power plants and steel mills in Indonesia, Thailand, Vietnam, South Korea, the United States, Japan, and other countries, to reduce air pollution and improve work environments.<\/p>\n

The soft fog design was discussed in the previous article. This article describes a steel mill using the high-velocity fog design.<\/p>\n

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Problems of Dust Dispersing | Material Yards and Coke Ovens | Steel Mills<\/h3>\n

There are a variety of sources for dust in steel mills. A large amount of dust comes from the material yards, coke ovens and in blast furnace taphole areas. From there it is spread easily by draft and wind causing unhealthy work conditions inside the mill and complaints from nearby residents outside the mill.<\/p>\n

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Outside measures to suppress dust were implemented, which include spraying water in the raw material yard to keep the dust from dispersing and renovating the equipment of the coke ovens to reduce dust.<\/p>\n

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Problems of Dust Eruptions | Blast Furnace Taphole Areas | Steel Mills<\/h3>\n

However, preventing dust from erupting in the taphole area when the taphole was opened had not been solved and was still causing a worsening of working conditions.<\/p>\n

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There are two main sources for the dust; one is area right around the taphole, and the other is the main runner that is the flow path of molten iron. Dust is generated around the taphole when the hot metal comes into contact with air and causes dust to escape at the opening, this however can be remedied with the help of a dust collection hood placed above this area.<\/p>\n

The molten iron then goes through the main runner to the next process. The main runner is usually covered by a main runner cover, with each section being approximately eight meters in length.
\nThese cover sections keep the molten iron from splashing but are also a shield against heat and prevent the dust clouds from escaping the runner.<\/p>\n

These measures generally work well, but the cover section in front of the taphole needs to be removed temporarily to allow the drilling machine to move into position to open the taphole. During these three or four minutes while the taphole is being opened, this gap without the cover leaves the pig iron surface exposed to air and allows the dust to rise and escape into the facility on an updraft of hot air. This dust, reaching high up in the facility and then dispersing broadly, cannot be completely captured with the overhead dust hood, and thereby causes a harmful environment.<\/p>\n

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High-Velocity Fog for Preventing Dust from Erupting<\/h3>\n

To address this problem, a high-velocity dust control system was proposed. It sprays a large volume of fog at high velocity to suppress the dust from escaping.<\/p>\n

Specialized nozzles installed to the upper left and right of the taphole start spraying directly at the taphole as soon as it is opened, suppressing the dust, and keeping it from escaping.<\/p>\n

By spraying the fog at a high flow velocity, it is possible to engulf the point of origin of the dust without being affected by the updraft. The fine droplets, approximately 80 \u00b5m, will also prevent the surrounding area and equipment from getting wet.<\/p>\n

Installation of the system is not a large-scale project, and the only things the customer needs to provide are water and compressed air.<\/p>\n