Effect of continuous steaming and different storage systems on parboiled rice quality | |
| Author | Adhikarinayake, T. B. |
| Call Number | AIT Thesis no. AE-89-15 |
| Subject(s) | Rice, Parboiled Rice--Storage |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A prototype model of a continuous flow steamer was designed and developed considering flow characteristics of high moist paddy through a pipe and evaluated using a laboratory autoclave as the steam source. This steamer was used with conventional and laboratory steaming methods to evaluate two farm level low cost storage structures made of ferrocement and clay/straw by steaming paddy at every 20 days storage, for a period of 2 months. Each storage bin has a holding capacity of 5 t of paddy. Paddy soaked at 60• C for 5 hrs and equilibrated overnight was steamed by the steamer. The flap inclination of 10° to the horizontal and discharge port area of 28. 9 sqcm was found to give optimum quality of parboiled rice when steam was supplied at a rate of 9 kg/hr with a steam pressure of 1 . 5 kg/cm·. Under these conditions, the steamer had a capacity of 104. 5 kg/hr parboiled rice at a 14% moisture content Cwb). When compared with conventional methods of steaming, the developed steamer was able to steam soaked paddy 2. 78 times faster. The steam requirement was 2. 7 1 times lower than the conventional method. Temperature at the center of both storage bins and at the periphery of the clay/straw bin was almost constant throughout the day, but the temperature near the wall of the ferrocment bin fluctuated with ambient temperature. The moisture content of paddy located near the wall and the top layer of the ferrocement bin was decreased from on an average, 1 3. 5 to 1 2. 5% while the moisture content of paddy at the other points of the ferrocement and also, the moisture content of paddy stored in the clay/straw bin was found to be unchanged during the period of test. The structure of both bins had no effect on quality of parboiled rice steamed by three methods, but the ferrocement bin structure has a significant effect on total milling yield and brokens during raw milling, beyond 20 days of storage. Although the total ' construction cost of clay/straw bin was higher than the ferrocement bin, material requirement for the clay/straw bin was 1. 6 times less than the ferrocement bin. Overall performance of the clay/straw bin over the ferrocement bin was satisfactory in terms of temperature and moisture distribution and quality of raw rice. |
| Year | 1989 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Athapol Noomhorm; |
| Examination Committee(s) | Illangantileke, Sarath G. ;Gupta, Chandra P. ;Jindal, Vinod Kumar ; |
| Scholarship Donor(s) | Federal Republic of Germany ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |