Effect of Fluidized Bed Drying Temperature on Various Quality Attributes of Paddy

2004 ◽  
Vol 22 (7) ◽  
pp. 1731-1754 ◽  
Author(s):  
Supawan Tirawanichakul ◽  
Somkiat Prachayawarakorn ◽  
Warunee Varanyanond ◽  
Patcharee Tungtrakul ◽  
Somchart Soponronnarit
Keyword(s):  
Fluidized Bed ◽  
Quality Attributes ◽  
Drying Temperature ◽  
Fluidized Bed Drying

scholarly journals Challenges and Opportunities Associated with Drying Rough Rice in Fluidized Bed Dryers: A Review

2020 ◽  
Vol 63 (3) ◽  
pp. 583-595 ◽  
Author(s):  
Kaushik Luthra ◽  
Sammy S. Sadaka
Keyword(s):  
Developing Countries ◽  
Moisture Content ◽  
Fluidized Bed ◽  
Airflow Rate ◽  
List Type ◽  
Rice Quality ◽  
Drying Temperature ◽  
Rough Rice ◽  
Energy And Exergy ◽  
Fluidized Bed Drying

Highlights Fluidized bed drying of rice has several advantages that outweigh its disadvantages. Increasing the drying temperature above 60°C could reduce rice quality. Research related to energy and exergy efficiencies in fluidized bed dryers of rice is needed. Abstract. Rice (Oryza sativa L.) is a staple food for more than half the world’s population. World rice production reached approximately 740 million metric tons (MMT) in 2018 due to the ever-increasing demand driven by population and economic growth. Rice producers face challenges in meeting this demand, especially in developing countries where rice is prone to spoilage if the moisture content is not reduced to a safe level shortly after harvest. Rice producers, particularly in developing countries, typically use conventional drying methods, i.e., sun drying and natural air drying. These methods are time-consuming and environmentally dependent. On the other hand, fluidized bed drying, which is a well established technology, could provide rice producers with an effective drying technique that is quick, practical, affordable, and portable. Several innovative designs for fluidized bed dryers have been developed that could be installed on-farm or off-farm at a reasonable cost. Some studies have mentioned that the main advantage of fluidized bed drying is the increase in drying rate and the reduction of rice spoilage after harvest. Conversely, other studies have raised alarms regarding low rice quality, which is seen as a significant flaw of fluidized bed drying. Due to this lack of consensus, there is a great need to review this drying technology objectively. Therefore, this review article explores fluidized bed drying and details its advantages and disadvantages related to rice drying. It also sheds light on the effects of the operating parameters involved in fluidized bed drying, i.e., rice moisture content, drying temperature, airflow rate, air velocity, drying duration, and tempering duration, on dryer performance and rice quality. Several fluidized bed numerical models are also reviewed and evaluated. Additionally, this review explores the energy and exergy efficiencies of fluidized bed dryers and suggests opportunities for research associated with fluidized bed drying of rice. Keywords: Energy, Exergy, Fluidized bed drying, Fluidized bed modeling, Moisture content, Rice quality, Rough rice, Tempering.

Effects of fluidized bed drying temperature and tempering time on quality of waxy rice

2009 ◽  
Vol 95 (3) ◽  
pp. 517-524 ◽  
Author(s):  
Petcharat Jaiboon ◽  
Somkiat Prachayawarakorn ◽  
Sakamon Devahastin ◽  
Somchart Soponronnarit
Keyword(s):  
Fluidized Bed ◽  
Drying Temperature ◽  
Waxy Rice ◽  
Fluidized Bed Drying ◽  
Tempering Time

scholarly journals Drying Characteristics and Quality Attributes Affected by a Fluidized-Bed Drying Assisted with Swirling Compressed-Air for Preparing Instant Red Jasmine Rice

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1738
Author(s):  
Prarin Chupawa ◽  
Tiwanat Gaewsondee ◽  
Wasan Duangkhamchan
Keyword(s):  
Fluidized Bed ◽  
Air Temperature ◽  
Effective Diffusion ◽  
Quality Attributes ◽  
Air Pressure ◽  
Compressed Air ◽  
Model Parameters ◽  
Drying Characteristics ◽  
Fluidized Bed Drying ◽  
Jasmine Rice

A new process for the production of instant red jasmine rice was investigated using fluidized bed drying with the aid of swirling compressed air. Drying characteristics were evaluated using the operating parameters of fluidizing air temperature (90–120 °C) and pressure of swirling compressed air (4–6 bar). Appropriate air pressure was determined based on the highest value of model parameters from the semi-empirical Page equation and effective diffusivity. Influences of supply time of swirling compressed air (2–10 min) and drying temperature of 90–120 °C were investigated and optimized based on the quality attributes using response surface methodology. Drying at 120 °C and compressed air pressure of 6 bar gave the highest rate constant and effective diffusion coefficient. Drying at 120 °C combined with injecting swirling air for 2 min was the most suitable approach, while drying at 90 °C and supplying compressed air for 10 min was the best choice to preserve antioxidant properties. Air temperature of 98.5 °C with 2 min supply of swirling compressed air suitably provided high physical and rehydration properties and retained high health benefits of antioxidant compounds. Finally, after rehydration in warm water at 70 °C for 10 min, the textural properties of the rehydrated rice sample were comparable to conventionally cooked rice.

scholarly journals Fluidized Bed Drying of Pumpkin (Cucurbita sp.) Seeds

Foods ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 147 ◽  
Author(s):  
Saheeda Mujaffar ◽  
Sheena Ramsumair
Keyword(s):  
Fluidized Bed ◽  
Crude Protein ◽  
Agricultural Waste ◽  
Fluidized Bed Dryer ◽  
Rate Period ◽  
Drying Behavior ◽  
Pumpkin Seeds ◽  
Fluidized Bed Drying ◽  
Fresh Cut ◽  
Pumpkin Powder

Pumpkin seeds are a major agricultural waste from the fresh-cut produce industry. The objective of this study was to investigate the drying behavior of untreated, whole pumpkin seeds in a fluidized bed dryer at 50–80 °C (2.87 m/s), with a view to producing a high-quality pumpkin powder from dried seeds. Seeds were dried at 50–80 °C to an average equilibrium moisture value of 0.035 to 0.006 g H2O/g DM (3.4 to 0.6% wb). Drying occurred in the falling rate period only and drying rate constants ranged from 0.0226 to 0.0900 1/min with corresponding diffusivity values for the first falling-rate period ranging from 4.68 to 18.63 × 10−10 m2/s. The activation energy (Ea)—for the first falling rate period was determined to be 43.9 kJ/mol. Of the nineteen thin layer models tested, the Alibas model could be successfully used as a general model to predict the Moisture Ratio (MR) data for all temperatures investigated. After drying, seeds were blended to produce powders, which were found to be high in fat, crude protein and fiber.

Numerical Simulation on Superheated Steam Fluidized Bed Drying: I. Model Construction

2011 ◽  
Vol 29 (11) ◽  
pp. 1325-1331 ◽  
Author(s):  
Deyong Yang ◽  
Zhenhua Wang ◽  
Xiaoli Huang ◽  
Zhifeng Xiao ◽  
Xiangdong Liu
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Superheated Steam ◽  
Model Construction ◽  
Fluidized Bed Drying

Designing and Optimizing a Neural Network for the Modeling of a Fluidized-Bed Drying Process

2002 ◽  
Vol 41 (9) ◽  
pp. 2262-2269 ◽  
Author(s):  
José A. Castellanos ◽  
María C. Palancar ◽  
José M. Aragón
Keyword(s):  
Neural Network ◽  
Fluidized Bed ◽  
Drying Process ◽  
Fluidized Bed Drying
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