Designing a ventilation system in an existing work environment, all the while using good engineering practice -- straight lines, radius of curvature, distance from bends, etc., and respecting space limitations can be a complex matter. Thus design plans are drawn up with appropriate duct diameters, adequate number of elbows, right fittings and couplings, etc.
The challenge here involved the development and, moreover, the application of numeric models which would determine the velocity profiles in the ducts.
So STS Canada used modern software to validate the design of the new ventilation shafts. With the right data input, these software rendered the velocity profiles, abrasion zones and parts where settling and build up would occur, all of which in 3D.
The results obtained in such a fashion allowed STS personnel to characterize velocity profiles along the ducts and shafts. Zones where the velocity was too great corresponded to abrasion zones and, inversely, parts where the velocity was too low corresponded to possible build-up zones. With the results, shafts were modified to get better velocity profiles to reduce abrasion and settling. In parts where shafts were difficult to correct, recommendations were issued to protect them from abrasion.
Ventilation system for the ore calcining furnaces
Ventilation shaft flow modeling