DEVELOPMENT A MECHANICAL STIRRING UNIT FOR DRYING RICE GRAINS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 3, Volume 32, Issue 2, April 2015, Page 433-450 PDF (1.05 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2015.98573 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Mokhtar C. Ahmed | ||||
| Agricultural Engineering Research Institute, Agric. Res. Center, Dokki-Giza, Egypt. | ||||
| Abstract | ||||
| The present study was carried out to develop and evaluate the performance of a mechanical stirring unit for rice crop after harvesting for drying to increase stirring efficiency and decrease both power and cost requirements. The aim of this study is to develop a mechanical stirring-unit for drying rough rice-grains after harvesting. The performance of the developed stirring unit was studied as a function of change in screw paddles speed of (120, 180 and 300 rpm ), paddle inclination angle of( zero, 15 and 30deg) with two paddle shapes (trapezoid and rectangle) and a unit wheel width of (4 and 10 cm). The developed unit performance was evaluated in terms of unit capacity, stirring efficiency and required power. The results showed that the screw trapezoid paddle with inclination angle of 300 decreased specific power by 15.79 % and 20.83 % by increasing paddle speed from 120 to 180 rpm and from 180 to 300 rpm, respectively. While, under the same conditions, stirring efficiency increased by 4.39 %, and volumetric capacity decreased by 8.8 % and 17.6 % under conditions of increasing inclination angle from zero to 150 and to 300, respectively at the same screw pitch of 20 cm with layer height of 7.0 cm. Total costs with the use of the developed stirring unit decreased by 48.2% comparing to the traditional method (by feet) according to hiring laborers with recent prices | ||||
| References | ||||
|
Angledette, A. (1962). Rice Drying Principles and Techniques. Informal Working Bulletin No. 23, FAO, Rome. 73 pp.
Bonazzi, C.; Courteis, F.; Geneste, C.; Lahon, M. C. and Bimbent, J. (1997). Influence of Drying Conditions on the Processing Quality of Rough Rice. Dry. Technol., 15(3, 4): 1141-1157.
Bradburn, N., Blunden, G., Cocker, R.D., Jewers, K. (1993). Aflatoxin contamination of maize. Tropical Science 33 (1), 418–428.
Daniels, M. J., Marks, B. P., Siebenmorgen, T. J., Mc New, R. W., Meullenet, J. F. (1998). Effect of long grain rice storage history on end use quality. Journal of Food Science 63 (1), 832–835.
Dillahunty, A. L., Siebenmorgen, T. J., Buescher, R. W., Smith, D. E., Mauromoustakos, A. (2001). Effect of temperature, exposure duration, and moisture content on color and viscosity of rice. Cereal Chemistry 78 (5), 559–563.
Evanson, R. E., Herdt, R. W., Hossain, M. (Eds.) (1996). Rice Research in Asia: Progress and Priorities. International Research Institute-CAB International, Wallingford, UK, 418p.
FAO (2013). Agricultural engineering in development - Post-harvest operations http://www.fao.org/documents/en/detail/20980-( 2013)
Jenkins, B. M. (1989). Field-drying rice using modified swath harvesting. California Agriculture, March-April, 1989: 26-27.
Jeon, Y. W; Halos, S. L. and Elepano, A. R. (1989). Innovations dans les technologies de séchage des grains, In : Céréales en régions chaudes. Conservation & transformation (pp. 71-83).Agricultural Engineering Department, International Rice Research Institute (IRRI), PO Box 933, Manila, Philippines.
Li, H. and R. V. Morey (1984). Thin-layer drying of yellow dent corn. Transactions of the ASAE: 581-585.
Mendoza. E. E.; Rigor, A. C.; Mordido, C. C. and Marajas, A. A. (1982). Grain Quality Deterioration in On-farm Level of Operations. Proceedings of 5th Annual Grains Postharvest Technology Workshop, Los Baños, 1982. Manila: South East Asia Cooperative Postharvest Research and Development Programme.
Meullenet, J. F., Bradley, C., Griffin, P. M., Daniels, M. J. (1999). Effects of rough rice drying and storage conditions on sensory profiles of cooked rice. Cereal Chemistry 76 (4), 483–486.
Pearce, M.D., Marks, B.P., Meullenet, J. F. (2001). Effects of postharvest parameters on functional changes during rough rice storage. Cereal Chemistry 78 (4), 354–357.
Proctor, D. L. (1994). Grain storage techniques Evolution and trends in developing countries. FAO Agricultural Services Bulletin No. 109
Ranalli, R. P., Howell J. R., T. A., Siebenmorgen, T. J. (2003). Effects of controlled ambient aeration on rice quality during on-farm storage. Cereal Chemistry 80 (1), 9–12.
Soetoyo, R. and Soemardi, R. (1979). The Effect of Thickness of Paddy Sun Drying on Milling Quality. Proceedings of 2nd Annual Grains Post-harvest Workshop, Jakarta, 16-18 January 1979. Manila; South East Asia Co-operative Post-harvest Research and Development Programme.
Srivastava, A.C. (1993). Engineering Principals of Agric. Machines ASAE Textbook No. 6 Published the ASAE.
Teter, N. (1987). Paddy Drying Manual. Agricultural Services Bulletin No. 70, FAO, Rome. 123 pp.
Zhou, Z., Robards, K., Helliwell, S., Blanchard, C. (2003). Effect of rice storage on pasting properties of rice flour. Food Research International 36 (1), 625–634. | ||||
|
Statistics Article View: 163 PDF Download: 202 |
||||
