Sequential modeling of fluidized bed paddy dryer

Bizmark, Navid; Mostoufi, Navid; Sotudeh‐Gharebagh, Rahmat; Ehsani, Hossein

doi:10.1016/j.jfoodeng.2010.07.015

Cited by 27 publications

(12 citation statements)

References 24 publications

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“…A very satisfactory agreement between simulated and measured results was achieved. Bizmark et al (2010) reported a sequential method to model a continuous plug-flow fluidised bed dryer, which is based on dividing the dryer into sections in series with ideal mixing for both solid and gas phases in each section. It was shown that the model fitted the experimental data satisfactorily.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a continuous plug-flow fluidised bed dryer for rough rice

Picado

Gamero²

2014

Nexo Revista Científica

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In this study, a mathematical model to simulate the drying of rough rice in a continuous plug-flow fluidised bed dryer is presented. Equipment and material models were applied to describe the process. The equipment model was based on the differential equations obtained by applying mass and energy balances to each element of the dryer. Concerning the material model, mass and heat transfer rates in a single isolated particle were considered. Mass and heat transfer within the particles was described by analytical solutions with constant effective transport coefficients. To simulate the dryer, the material model was implemented in the equipment model in order to describe the whole process. Calculation results were verified by comparison with experimental data from the literature. There was very good agreement between experimental data and simulation. The effects of gas temperature and velocity, particle diameter, dry solid flow and solid temperature on the drying process were investigated. It was found that the changes in gas velocity, dry solids flow and solid temperature had essentially no effect on drying behaviour.Keywords: Plug-flow; Fluidised bed dryer; Modelling; Rough rice RESUMENEn este estudio, se presenta un modelo matemático para simular el secado de arroz con cáscara en un secador continuo de lecho fluidizado con flujo pistón. Para describir el proceso se aplicó un modelo del equipo y un modelo del material. El modelo del equipo se basó en las ecuaciones diferenciales obtenidas por la aplicación de balances de masa y energía a cada elemento del secador. En relación al modelo del material, se consideraron velocidades de transferencia de masa y calor en una partícula aislada. La transferencia de masa y calor dentro de las partículas fue descrita por soluciones analíticas con coeficientes efectivos de transporte constantes. Para simular el secador, el modelo del material fue implementado en el modelo del equipo con el fin de describir el proceso completo. Los resultados de la simulación fueron verificados por medio de la comparación con datos experimentales de la literatura. Se comprobó que existe una alta concordancia entre los datos experimentales y la simulación. Se investigaron los efectos de la temperatura y velocidad del gas, diámetro de partícula, flujo de solidos secos y temperatura del solido sobre el proceso de secado. Se encontró que los cambios en la velocidad del gas, flujo de solidos secos y temperatura del solido no tuvieron efecto esencialmente sobre el comportamiento del secado.Palabras clave: Flujo pistón; Secador de lecho fluidizado; Modelación; Arroz con cáscara (recibido

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Section: Introductionmentioning

confidence: 99%

Simulation of a continuous plug-flow fluidised bed dryer for rough rice

Picado

Gamero²

2014

Nexo Revista Científica

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“…Good agreement was obtained between the model output and experimental results. Bizmark et al (2010) developed a sequential model for a continuous plug-flow FB dryer using initial moisture content, airflow, and particle flow rate as variables. Their model estimated the final moisture content of rough rice with less than 4.5% inaccuracy.…”

Section: Fluidized Bed Modelingmentioning

confidence: 99%

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

Luthra¹,

Sadaka²

2020

Transactions of the ASABE

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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.

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“…Work [5] elaborated the system approach for choosing correspondent drying parameters. This approach can provide simple and comprehensive instructions for choosing suitable working parameters for any drying machine with a pseudo-liquefied layer with a possibility of the maximal permeability for drying vegetable raw materials with the high level of admixtures.…”

Section: Introductionmentioning

confidence: 99%

Iinfluence of Main Technological Parameters of Drying on Quality of Bagasse From Carrot and Beet

Сардаров

Mayak

Shevchenkо

et al. 2018

EUREKA: Life Sciences

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The work studies the drying process of vegetable bagasse, namely of carrot and beet. There is studied the moisture content kinetics of vegetable bagasse and determined the dependence of the process duration on main technological parameters in the work of a vibration vacuum dryer, namely, an amplitude and frequency. There were studied quality parameters of obtained concentrated products, namely the colorimetric estimation of dried bagasse of carrot and beet. Based on obtained results of the study, it was established, that the use of vibration in the process of drying bagasse favors conservation and formation of colorimetric characteristics of a dried product. Determined color characteristics gave a possibility to establish, that at thermal processing it is very important to decrease the drying process duration and temperature. Research data proved prospects of producing concentrated products, namely, dried bagasse of carrot and beet by the offered method. It allows to regulate quality parameters of a ready product: color, brightness, consistence, viscosity and physical-chemical properties. Obtained concentrated products are characterized with high organoleptic indices, food value. This product may be used in the wide spectrum of food industry, such as, for example: juice supplement, stuff for confectionary mass, filling for confectionary products, as biological supplement for healthy nutrition.

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Sequential modeling of fluidized bed paddy dryer

Cited by 27 publications

References 24 publications

Simulation of a continuous plug-flow fluidised bed dryer for rough rice

Simulation of a continuous plug-flow fluidised bed dryer for rough rice

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

Iinfluence of Main Technological Parameters of Drying on Quality of Bagasse From Carrot and Beet

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