Drying Characteristics of Corn in Fluidized Bed Dryer

Soponronnarit, Somchart; Pongtornkulpanich, Anan; Prachayawarakorn, Somkiat

doi:10.1080/07373939708917311

Cited by 44 publications

(24 citation statements)

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“…With gradually increasing in air flow through a bed of material, fixed bed, minimum fluidized bed (semi fluidized bed), bubbling fluidized bed and transportation will be created, respectively. From minimum fluidized bed to transportation point is known as fluidization (Kunii and Levenspiel 1991;Soponronnarit et al 1997). In fluidized bed drying, heat and mass transfer between drying air and material are very high.…”

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“…Furthermore, fluidized bed drying prevents the hot spots formation and makes easy the control of process, especially for materials sensitive to temperature (Gazor 2009). Fluidized bed drying has been utilized for obtaining dried food and agricultural materials with high quality such as: corn (Soponronnarit et al 1997), broad beans (Hashemi et al 2009), milky mushroom (Arumuganathan (1) inverter, (2) fan and electrical motor, (3) thermostat, (4) electrical heater, (5) mixing chamber, (6) diffuser, (7) thermocouple (8) input air temperature recorder, (9) drying chamber, (10) air velocity sensor, (11) chamber cap, (12) outlet air temperature recorder, (13) computer et al 2009), rough rice (Amiri Chayjan et al 2009) and green beans (Souraki and Mowla 2007).…”

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Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

et al. 2011

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This study investigated thin layer drying of squash seeds under semi fluidized and fluidized bed conditions with initial moisture content about 83. 99% (d.b.). An experimental fluidized bed dryer was also used in this study. Air temperature levels of 50, 60, 70 and 80°C were applied in drying samples. To estimate the drying kinetic of squash seed, seven mathematical models were used to fit the experimental data of thin layer drying. Among the applied models, Two-term model has the best performance to estimate the thin layer drying behavior of the squash seeds. Fick's second law in diffusion was used to determine the effective moisture diffusivity of squash seeds. The range of calculated values of effective moisture diffusivity for drying experiments were between 0.160×10 −9 and 0.551×10 −10 m 2 /s. Moisture diffusivity values decreased as the input air temperature decreased. Activation energy values were found to be between 31.94 and 34.49 kJ/mol for 50°C to 80°C, respectively. The specific energy consumption for squash seeds was calculated at the boundary of 0.783×10 6 and 2.303×10 6 kJ/kg. Increasing in drying air temperature in different bed conditions led to decrease in specific energy value. Results showed that applying the semi fluidized bed condition is more effective for convective drying of squash seeds. The aforesaid drying characteristics are useful to select the best operational point of fluidized bed dryer and to precise design of system.

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Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

et al. 2011

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“…Results showed that drying process is affected by drying air flow rate, air temperature, air relative humidity and initial moisture content. Soponronnarit et al (1997) studied the drying characteristics of corn in a laboratory fluidized bed dryer at 150, 170 and 200°C air temperatures. They reported that corn drying with high initial moisture content with air temperature at 170°C could be done without quality loss.…”

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Modeling of moisture diffusivity, activation energy and specific energy consumption of high moisture corn in a fixed and fluidized bed convective dryer

Chayjan¹,

Parian²,

Esna-Ashari³

1970

Span. j. agric. res.

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Thin layer drying characteristics of high moisture corn under fixed, semi fluidized and fluidized bed conditions with high initial moisture content (66.82% wb) in a laboratory fluidized bed convective dryer was studied at air temperatures of 50, 65, 80 and 95°C. In order to find a suitable drying curve, seven thin layer-drying models were fitted to the experimental data of moisture ratio. Among the applied mathematical models, Midilli et al. model was the best for drying behavior prediction in corn thin layer drying. This model presented high values for correlation coefficient (R 2 ). Fick´s second law was used to compute moisture diffusivity with some simplifications. Computed values of moisture diffusivity varied at the boundary of 4.87 × 10 -11 -2.90 × 10 -10 m 2 s -1 and 1.02 × 10 -10 -1.29 × 10 -9 m 2 s -1 during the first and second drying falling-rate, respectively. Values of effective moisture diffusivity for corn were also increased as input air temperature was increased. Value of activation energy varied from a minimum of 18.57 to a maximum of 50.74 kJ mol -1 from 50 to 95°C with drying conditions of fixed to fluidized bed. Specific energy consumption (SEC) for thin-drying of high moisture corn was found to be in the range of 0.33 × 10 6 -1.52 × 10 6 kJ kg -1 from 50 to 95°C with drying condition of fluidized and fixed bed, respectively. Increase in air temperature in each air velocity caused decrease in SEC value. These corn properties would be necessary to design the best dryer system and to determine the best point of drying process.Additional key words: drying; maize; Midilli et al. model; semi fluidized. ResumenModelización de la difusividad de la humedad, la energía de activación y el consumo específico de energía para el grano de maíz húmedo en un secador convectivo de lecho fijo y fluidizado Se estudiaron las características del secado en capa delgada del grano de maíz húmedo en condiciones de lecho fijo, semi-fluidizado y fluidizado con alto contenido de humedad inicial (66,82%), en un secador de convección de lecho fluidizado de laboratorio a las temperaturas del aire de 50, 65, 80 y 95°C. Con el fin de encontrar una curva de secado apropiada, se ajustaron siete modelos matemáticos de secado en capa delgada a los datos experimentales de la ratio de humedad. Entre los modelos aplicados, el de Midilli et al., con un alto coeficiente de correlación (R 2 ), fue el mejor para predecir el secado del maíz en capa delgada. Se utilizó la segunda ley de Fick para calcular, con algunas simplificaciones, la difusividad de la humedad, que dio unos valores entre 4,87 × 10 -11 -2.90 y 1,02 × 10 -11 -1.29 m 2 s -1 durante la primera y segunda fase de secado de rapidez decreciente, respectivamente. Los valores de la difusividad efectiva de la humedad para el maíz también aumentaron al aumentar la temperatura de entrada del aire. El valor de la energía de activación varió desde un mínimo de 18,57 a un máximo de 50,74 kJ mol -1 entre 50 y 95°C, con condiciones de secado del lecho fijo a fluidizado. El c...

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“…Fluidized bed drying is rapid and more uniform compared with fixed bed drying (Soponronnarit et al 1997). Fluidized bed drying was employed for drying of some agricultural grain products such as: broad beans (Hashemi et al 2009) (Souraki, Mowla 2007) and corn (Soponronnarit et al 1997).…”

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“…With gradually increasing in air flow rate, a bed of fluffy material is obtained, namely minimum fluidized bed (semi fluidized bed); afterward with another increase in air flow rate, bubbling fluidized bed and transportation phenomenon would be observed. At the semi fluidized bed, maximum value of pressure drop is obtained and particles weight is equal to frictional force between bed particles (Kunii, Levenspiel 1991;Soponronnarit et al 1997).…”

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Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

Chayjan¹,

Salari²,

Shadidi³

2012

Res. Agric. Eng.

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Amiri Chayjan R., Salari K., Shadidi B., 2012. Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions. Res. Agr. Eng., 58: 73-82.Thin layer drying properties of high moisture garlic sheets under semi fluidized and fluidized bed conditions with high initial moisture content (about 154.26% d.b.) were studied. Air temperatures of 50, 60, 70 and 80°C were applied to garlic samples. Among the applied models, Page model was the best to predict the thin layer drying behavior of garlic sheets. Using this model, correlation coefficient (R 2 ) was high for all drying cases. The computed values of D eff were between 3.38 × 10 -10 and 2.54 × 10 -9 m 2 /s during the falling rate drying. Values of D eff for garlic sheets were also increased with increasing in input air temperature. Activation energy values were varied between 51.32 and 60.58 kJ/mol for 50 to 80°C, respectively. The specific energy consumption (SEC) for garlic specimens was placed in the range of 0.316 × 10 6 and 0.979 × 10 6 kJ/kg from 50 to 80°C, respectively. An increase in air temperature caused decrease in SEC value. Application of semi fluidized bed convective drying with temperature between 50 and 60°C was suitable to produce dried garlic.

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Drying Characteristics of Corn in Fluidized Bed Dryer

Cited by 44 publications

References 3 publications

Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

Modeling of moisture diffusivity, activation energy and specific energy consumption of high moisture corn in a fixed and fluidized bed convective dryer

Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

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