Local exhaust ventilation systems are designed to take harmful emissions from the places of their formation with the help of shelters or local suction, transport polluted air, clean it in filters or dust collectors and release it into the atmosphere. Local suction and shelters have the most diverse design and shape: these are umbrellas, fume hoods, full shelters, side and ring suction at baths and shaft furnaces, suction panels, casings, etc.
Many harmful substances released during technological processes actively affect local suction pipes, air ducts, fans, filters, causing their severe corrosion, in addition, they can be explosive and fire-hazardous. In these cases, air ducts and other devices in contact with an aggressive environment are made of materials that are not subject to intense corrosion by the moving medium (corrosion-resistant alloy steels, aluminum, titanium. metal, vinyl, polyethylene, etc.), or apply special coatings of steel ducts with acid- and alkali-resistant dyes, enamels and varnishes. In such systems, fans and other equipment are installed in an intrinsically safe protected design.
1. Name the main parameters of the air environment.
2. What is the main purpose of the ventilation system?
3. In which cases the use of natural ventilation systems is justified.
4. What is the advantage of mechanical ventilation systems?
5. What is the name of the process of heat recovery of the removed air, what are its technical and economic advantages?
6. What material is used to produce ventilation ducts most often?
7. What, in your opinion, is affected by the thickness of the metal in the production of air ducts?
8. In which cases air showering is used?
9. Name the main processes of air treatment in the supply ventilation system.
10. In which cases a special design of air ducts and ventilation equipment is used?