| Author | Cho, Cho |
| Call Number | AIT Thesis no.AE-91-30 |
| Subject(s) | Rice--Drying
|
| Note | A thesis submitted in partial fulfilment of the requirement
for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | In this study, the mode ling of rough rice drying in a spouted-bed
was investigated in order to control the drying operation in
terms of the grain temperature. A spouted-bed dryer was designed
and constructed by Paramalingam was used for carrying out the
experiments, and its performance characteristics were evaluated.
Th e grain temperature was considered most important variable and an
attempt was made to control it using a simple thermostat controller
to turn the air heat er on and off depending upon the set grain
temperature level.
In first phase of experimentation, the drying experiments were
carried out using inlet air heated to constant temperatures of 50,
60, 70, 80, and 90°C. The grain temperature and moisture content
histories were determined. Empirical models for drying of rice in
spouted-bed were developed in terms of fixed conditions of inlet
air as well as bulk mean grain temperature. Both type of models
estimated the spouted-bed drying of rice reasonably well.
In second phase of study, it was shown that the thermostat
operation enabled the control of grain temperature within
reasonable limits. Drying experiments using grain temperatures of
40, 45, 50, and 55°C were conducted. It was possible to estimate
the changes in moisture content of rice with the help of the
developed models. It was observed that the head yield decreased
abruptly after grain temperature reached a level of 40°C and above.
This grain temperature limit was lower than the findings of
conduction h eating of rice most possibly due to the initial poor
quality of rewetted rough rice. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| 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) | Jindal, Vinod Kumar; |
| Examination Committee(s) | Gupta, C.P.;Athapol Noomhorm; |
| Scholarship Donor(s) | DANIDA; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |