Present study was conducted to find out energy consumption of various types of energies to convert one tonne of paddy into rice in raw rice mill and parboiled rice mill. The study was design in such a way that each unit operation can study closely and the energy input determined experimentally. The EEC was measured with an electrical energy meter (kwh). The NEEC was calculated from the difference of energy meter readings at load and no load. The results indicated that the polisher consume a considerably large amount of NEEC (5.07 kWh). Minimum EEC was 0.5 kWh with aspirator. The maximum SEC was high 5.07 kWh/t of polisher whereas; minimum SEC was 0.39 kWh of separator. MEC was 10.46 kWh/t, EEC was 25.83 kWh/t and total energy consumption of rice mill was 36.29 kWh/t. The recovery of polished rice was 70%.
Pre-parboiling section of parboiled rice mill was of 3 t/h capacity having a cleaner and a storage bin of 15 tonnes. The milling section got the power from electricity whereas parboiling and drying of paddy was done by the heat energy got from rice husk. Based on the production technology under study, the type and magnitudes of the parameters required for the energy evaluation of each unit operation were recorded. For consistency, the energy components were calculated on the basis of one tonne of paddy. Maximum and minimum NEEC were of polisher-II 7.23 kWh and grader 0.48 kWh for one tonne paddy processing, respectively. EEC at load was high (8.50 kWh) of hot air blower. Aspirator was consumed minimum energy 0.5 kWh at load. Maximum and minimum SEC was 3.67 kWh/t of polisher-III and 0.34 kWh/t of bucket elevator, respectively. The results also depicted that the energy consumed in pre parboiling 1.34, soaking 527.21, steaming 75.16, drying 27158, milling 39.75 and weighing and bagging 1.67 kWh/t. The total energy consumption was 923.97 kWh/t. The recovery of final product was 80%.
