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• W1608925009 abstract "This thesis evaluates the suitability of a cyclone dryer for the drying of paddy (rice grain).The design aim is to reduce the moisture content of paddy from a fresh harvest level of33% dry-basis to a more manageable level of 22% of dry basis, and to replace allclassical methods of drying. The cyclone dryer consists of a cylindrical tower containinga series of inverted conical baffles with central orifices that divide the tower intochambers. The moist particulate matter is fed into a stream of hot, dry air which enterstangentially at the base of the tower, creating a rotating flow within the dryer. The centralvortex and through-flow jet transport the particles upwards from chamber to chamberuntil discharged tangentially at the top. Recirculation of flow within the chamberslengthens the particle residence timeSingle-phase numerical calculations with the commercial RANS-based ComputationalFluid Dynamics (CFD) code CFX 5.7 are used for flow field and pressure droppredictions. Experimental observations in a small scale laboratory model are used forvalidation. Useful descriptions of the axial and tangential velocity distributions areobtained, and the pressure drop across the cyclone dryer chamber is predicted to about20% accuracy.Particle residence time in the laboratory model cyclone dryer is measured by the pulsetracer stimulus response technique. Observations using paddy grain and spherical silicagel particles show the mean residence time to vary quadratically with particleconcentration. The residence time distribution (RTD) is explained well by a tank-in-seriesmodel. Numerical predictions of particle residence time obtained from one-way coupledparticle transport modelling without particle dispersion using a Lagrangian/Eulerianapproach produce RTDs differing significantly from the experimental observations.However, the trends of mean residence time variations in response to changes in inlet airvelocity and number of cyclone chambers are correctly predicted. Single-pass drying tests with paddy grain demonstrate maximum moisture reductions of2.6-6.5% dry-basis obtained at inlet air temperatures of 82-89 °C and paddy grain feedrate of 0.03 kg/s. The specific energy consumption (SPEC) varies between 7.5-20.5MJ/kg of water evaporated, depending on the initial moisture content of paddy grain.Compared with fluidised bed and spouted bed paddy dryers employing 50-70% exhaustair recycling, the cyclone dryer gives a lower moisture reduction and a higher SPEC. Thisindicates that practical application of the model-scale cyclone dryer would require multipassoperation with exhaust air recycling to be sufficiently economic.Multi-pass laboratory tests show three-pass drying in a four-chamber cyclone dryer withinlet air temperature of about 80°C and 0.03 kg/s paddy grain feed rate to reduce themoisture content of paddy grain by about 11% dry-basis, with an SPEC of 13 MJ/kg ofwater evaporated. Recycling about 90% of the air would give a 70-75% reduction inSPEC compared to non-recycled air operation, and 3.5-4 MJ/kg water evaporated. This iscomparable to fluidised bed paddy dryer operation for similar initial moisture content ofthe paddy grain.Numerical simulations of silica gel particle drying based on two-way coupled particletransport modelling with a Lagrangian/Eulerian approach are also reported. Thesimulations consistently overpredict the moisture and heat transfer observedexperimentally using silica gel particle 3.25 mm in average diameter. As the meanparticle residence time was underpredicted , it is concluded that the water evaporationmodel used here gives a much higher moisture transfer rate than that observedexperimentally.Computational studies of the increase in residence time with geometric scale-up of thedryer indicate that a commercial scale unit small enough to be field portable couldachieve the desired moisture reduction of paddy grain with single pass operation." @default.
• W1608925009 created "2016-06-24" @default.
• W1608925009 creator A5086211314 @default.
• W1608925009 date "2006-01-01" @default.
• W1608925009 modified "2023-09-27" @default.
• W1608925009 title "Development of a cyclone rice dryer" @default.
• W1608925009 hasPublicationYear "2006" @default.
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