Abstract
Swirling flows occur in many processes within industry with little consideration given to pressure recovery. High tangential velocities occur in the exhaust nozzle which have been shown to persist for up to 20 pipe diameters downstream. This kinetic energy is dissipated by turbulence and friction and is unnecessarily lost. There is potential to recover this energy and reduce operating costs.
This paper shows that a tangential offtake with associated diffuser can be used to recover up to 45 per cent of the pressure loss, with an accompanying reduction in energy consumption. It has particular application in the cement and process industries, and has been tested on a novel prototype cement raw meal preheater tower.
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