A study on hot water generator (HWG) performance at drying process in BERNAS factory

Siti Nurzahidah, Md Zakhi (2014) A study on hot water generator (HWG) performance at drying process in BERNAS factory. Project Report. UTeM. (Submitted)

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Abstract

Hot Water Generator (HWG) and Cyclonic Husk Furnace (CHF) are the systems used for paddy drying. The drying process is an important process in rice processing to prevent the rice from getting damaged and broken during rice milling. Most of the BERNAS factories in Malaysia use the CHF system for paddy drying. The current problem with the CHF system is low quality of rice resulted from the paddy drying process in terms of grade, smell, and colour of rice. This is because the CHF system dries wet paddy with direct delivery of hot air to Inclined Bed Dryer (IBD). In view of the weakness of CHF, this study aims to prove the advantages of HWG over CHF for paddy drying process. More specifically, the aspects covered are rice productivity quality and its effect to sustainability. The objectives of this study are: (i) to analyse the HWG and CHF performances in terms of temperature of air supply, drying hours, quality of environment and rice processed; (ii) to study the problems associated with HWG and CHF systems; and (iii) to propose a solution for the HWG problems. Ishikawa diagram and 5 Whys analysis have been used in identifying the root causes and critical problems related to both systems. 25 experiments with different speed setting and number of IBD operating were conducted in determining standard speed setting of ID Fan, FD Fan, Screw Feeder 1 and Screw Feeder 2. A standard speed setting for ID Fan, FD Fan, Screw Feeder 1 and Screw Feeder 2 has been proposed for the HWG system. The experimental results show the quality of husk combustion has been improved by using the standard settings.

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