Energy analysis in rice mills for cogeneration in Thailand
1995
Wannee Ekasilp | Somchart Soponronnarit | Apichit Therdyothin (King Mongkut's Institute of Technology Thonburi, Bangkok (Thailand). Faculty of Energy and Materials. Dept. of Energy Technology)
Three types of rice mills are studied: the white rice mills that use only electricity, the white rice mills that use electricity and steam engines and the par-boiled rice mills that use electricity and steam in the parboiled process. The white rice mills and par-boiled rice mills use steam in heating process for paddy drying. Electrical energy consumption in the milling process of white rice mill and par-boiled rice mill are approximately 110 MJ/ton paddy and 129 MJ/ton paddy respectively. Electrical energy consumption of white rice mill is spent 43 percent in whitening and polishing process, 26 percent in screening and blowing process, 23 percent in bucket and conveyor process, and 8 percent in husking process. Electrical energy consumption in the milling process of par-boiled rice mill is spent 43 percent in whitening and polishing process, 38 percent in screening, bucket and conveyor process, 14 percent in blowing process, and 5 percent in husking process. The thermal energy consumption for par-boiled rice process is 2,410 MJ/ton paddy, of which 8 percent for soaking process, 6 percent for cooking process and 86 percent for paddy drying process. In the paddy drying process, the moisture content of the grain is reduced from 34 percent w.b. to 14 percent w.b. and thermal energy used is 10 MJ/kg water evaporated.
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