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Drying performances and milling quality of rice during industrial fluidized bed drying of paddy in Malaysia


Citation

Ibrahim, Mohd Nordin and Sarker, Md. Sazzat Hossain and Ab. Aziz, Norashikin and Punan, Mohd Salleh (2015) Drying performances and milling quality of rice during industrial fluidized bed drying of paddy in Malaysia. Pertanika Journal of Science & Technology, 23 (2). pp. 297-309. ISSN 0128-7680; ESSN: 2231-8526

Abstract / Synopsis

Field investigation on the operation of an industrial fluidized bed paddy dryer of 25 t/h capacity available in a processing complex of Padiberas Nasional Berhad (BERNAS) of Malaysia was carried out to assess its drying characteristics, energy consumption and quality of product during two paddy harvesting seasons. A grain drying simulation model was used to predict dryer performance which can be used as a basis for improving drying operations. For the first season (August-September), average drying rate was found to be 538 kg moisture/h to reduce moisture content (mc) from 36.98± 0.89% dry basis (db) to 27.58±0.79% (db) at 100-120°C of drying air temperature with a feed rate (capacity) of 7.75 t/h. In the second season (February-March), average drying rate was found to be 435 kg moisture/h to reduce mc from 28.14 ±0.68% (db) to 22.54 ± 0.69% (db) at 78-90°C drying air temperature with a feed rate of 9.5 t/h. The thermal and electrical energy consumptions were obtained as 7.57 and 0.97 MJ/kg water removed, respectively, for the first season, while 5.92 and 1.2 MJ/kg water removed for the second season. Higher head rice yield and whiteness and lower milling recovery were achieved during the first season than the second season at acceptable milling degree and transparency. Meanwhile, simulation results indicated that the dryer performed better in terms of increased drying capacity during the second than the first season; the dryer could be operated at 150°C to achieve almost double throughput capacity up to 20 t/h for the second season, while for the first season, high mc hindered the capacity to be at or below 7.75 t/h even when using higher a temperature of 160°C to reduce moisture to the desired final moisture of 24-25% (db). proportion of slower vehicles based on users’ opinion poll.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: Universiti Putra Malaysia Press
Keywords: Drying performance; Drying rate; Drying simulation; Energy consumption; Head rice yield; Industrial fluidized bed paddy dryer; Milling quality
Depositing User: Nabilah Mustapa
Date Deposited: 21 Aug 2015 16:41
Last Modified: 26 Jan 2016 12:46
URI: http://psasir.upm.edu.my/id/eprint/32878
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