1.What is blow-suction ventilation dust removal?
This is a highly efficient technology for controlling iron oxide scale dust on the surface of cold-rolled strip steel. The principle is to use compressed gas to create a high-speed airflow that blows away loose dust from the upper and lower surfaces of the strip steel, which is then collected by a suction hood and sent into the dust removal system. In practical applications, the dust removal effect is optimal when the nozzle installation angle is between 0° and 5°. This technology is particularly suitable for workstations that generate large amounts of iron oxide scale, such as at the inlet of pickling units, and can effectively reduce the dust concentration in the workshop.
2.In what scenarios is a combination of local exhaust ventilation and dust collector used?
Based on the characteristics of the dust generated in different processes, targeted dust collection equipment is configured.
Wet scrubbers: Particularly suitable for handling zinc powder and iron oxide fumes containing moisture generated in the galvanizing process. They effectively prevent flammable dust explosions and feature high purification efficiency.
Cyclone dust collectors: Commonly used to handle larger, heavier dust particles, such as the large amounts of metal powder generated in the grinding process.
3.In what scenarios are the unit's enclosed enclosure and ventilation system used?
At workstations that generate acid mist or alkali mist, such as pickling units, enclosed hoods are installed on the production line to centrally extract the dust-laden exhaust gas and send it to a scrubber for purification. This not only controls dust but also treats harmful gases.
4.What are the differences in the sources of dust?
Dust generated during cold rolling mainly originates from iron oxide scale in the pre-pickling stage, oil mist from the emulsion during rolling, and metal vapors (such as zinc powder) from the coating process. The particle size, humidity, oil content, and chemical composition of the dust vary greatly; therefore, technical solutions must be selected based on the characteristics of different processes.
5.What are the application scenarios for oil mist purification systems specifically designed for rolling mills?
To address the large amount of emulsion oil mist generated during the rolling process in cold rolling mills for cooling and lubrication, a dedicated exhaust system and oil mist purification device are required. This is a key aspect of the ventilation system design for cold rolling mills.