RFD Sand Cooler
As the cooling system starts, its control system first measures the temperature and moisture of return sand to determine rough water quantity accordingly. After return sand entering the cooler, it moves three-dimensionally in “∞” shape at horizontal and vertical directions driven by the blender and wind force. Meanwhile, the water dosing system sprays the determined quantity of water uniformly to the return sand. Water evaporates and carries a lot of heat. The evaporated hot air is exhausted into dust collecting system from the upper part of the cooler. During the stirring and cooling, the temperature and moisture measuring system continuously monitors the temperature and moisture variation of return sand. At the same time, the current of mixing motor is continuously monitored to adjust the position of discharging door so as to keep the sand quantity inside cooler stable. The output sand temperature and moisture is also measured and back fed to water dosing system to adjust water quantity. Thus, output sand temperature is controlled within 40℃ (or ambient temperature +10℃) and moisture is accurately controlled to 2.2±0.2%.