Manufacture and evaluation of double pass cooler for aquatic feed pellets
2010
El-Kinawy, W.S. | El-Shal, M.S. | Arnaout, M.A.I. | Megahed, M.M.
Cooling is one of the most important post-processing operations in the production of extruded aquatic feed pellets. In this study a simple design of double pass cooler was manufacturing for sinking pellets and the effect of different operating parameters on the final quality of extruded sinking aquatic feed (auger speed, air velocity and feeding rate) were investigated. The cooler parameters that were studied included three different air velocity in upper cylinder of 2.9, 4.6 and 5.8m/s, and 3.7, 5.3 and 8.2 m/s in bottom cylinder, four different auger rotating speeds of (45, 60, 75 and 90 rpm.), and three different cooler feeding rate of (250, 350 and 450 kg/h). The results showed that the highest cooling efficiency was 83.66%, the lowest out-put pellets temperature and output moisture content were 27.3°C and 9.93%, respectively at parameters of 5.8 and 8.2 m/s air velocity in upper cylinder and bottom cylinder respectively, 45 rpm. auger speed, and 250 kg feeding rate. The best pellets durability was 98.91 at air velocity of 2.9 and 3.7 m/s in upper cylinder and bottom cylinder respectively, 45rpm auger speed, and 450 kg feeding rate. Specific energy was 4.866 kW.h/ton and 0.00% total mash losses at air velocity of 2.9 and 8.2 m/s in upper cylinder and bottom cylinder respectively, 45 rpm auger speed, and 450 kg feeding rate.
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