Journal of Nuclear Fuel Cycle and Waste Technology

The structural and contamination characteristics of hot cells at KAERI were investigated. The SEM results showed that the size of the hot particulate on the inner surface of the hot cell ranged from 0.2 to 10 . It was found that an inlet flow rate of 15 m/sec was suitable for this developed cyclone with a 49 mm optimum vortex finder length. The results showed that the collection efficiency was about 85% for 3 particles. The collection efficiency didn';t show a sharp increase when the inlet flow rate was faster than 15m/sec. When the temperature of the inlet flow gas was increased, the collection efficiency of the cyclone was slightly decreased. The larger the vortex finder length was, the higher the pressure drop in the cyclone was. The cut size diameter decreased with an increment of the Reynolds number. It was established that the flow in the cyclone was a turbulent flow on the basis of the Reynolds number and this turbulent flow caused a pressure drop in the cyclone. decreased with increasing values of the Reynolds number and it gradually approached a constant value at a higher value of the Reynolds number. Namely, approached approximately 0.045 between 6000 and 8000 of the Reynolds number.

Keywords

cyclone,hot particulate,collection efficiency,cut size,Reynolds number