Modelling Diffusion-Limited Drying Behaviour in a Batch Fluidized Bed Dryer

Food storage is an essential process for food security and it needs to be free from any biological contamination. For the same, agriculture produce needs to be completely dried before sending for storage. The present work discusses a systematic approach to model drying parameters of corn kernels in a fluidized bed dryer. Experiments were designed according to a higher level Box-Behnken design combined with response surface methodology. Four parameters were chosen to vary namely: amount of corn kernels (50 -100 gm), temperature of drying (50 – 80⁰C), air velocity (6.01 – 8.08 m/s) and drying time (30 – 60 min) for experiments as well as for the model. The reduction of moisture content was determined after each experiment for understanding the behaviour of drying process. The model equations were obtained and surface response plots were generated in MATLAB to investigate the drying behaviour of corn kernels with all four parameters. Ultimately, this work represents the dependence of moisture removal on all four parameters chosen with efficient use of response surface methodology and Box-Behnken design. Analysis of variance confirmed that velocity of air and amount of corn are the most significant parameters along with temperature and time of drying. Optimum condition with the model were obtained as 50 gm of corn kernels, 80 ⁰C drying temperature, 8 m/sec velocity of air, and 60 min time of drying for 73.3 % of moisture from corn kernels.

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Performance Analysis of Solar Assisted Fluidized Bed Dryer Integrated Biomass Furnace with and without Heat Pump for Drying of Paddy

International Journal of Photoenergy ◽

10.1155/2016/3801918 ◽

2016 ◽

Vol 2016 ◽

pp. 1-17 ◽

Cited By ~ 2

Author(s):

M. Yahya

Keyword(s):

Moisture Content ◽

Fluidized Bed ◽

Heat Pump ◽

Specific Energy Consumption ◽

Drying Rate ◽

Fluidized Bed Dryer ◽

Moisture Extraction ◽

Rate Period ◽

Drying Behaviour ◽

Kinetics Of

The performances of a solar assisted fluidized bed dryer integrated biomass furnace (SA-FBDIBF) and a solar assisted heat pump fluidized bed dryer integrated biomass furnace (SAHP-FBDIBF) for drying of paddy have been evaluated, and also drying kinetics of paddy were determined. The SA-FBDIBF and the SAHP-FBDIBF were used to dry paddy from 11 kg with moisture content of 32.85% db to moisture content of 16.29% db (14% wb) under an air mass flow rate of 0.1037 kg/s within 29.73 minutes and 22.95 minutes, with average temperatures and relative humidities of 80.3°C and 80.9°C and 12.28% and 8.14%, respectively. The average drying rate, specific energy consumption, and specific moisture extraction rate were 0.043 kg/minute and 0.050 kg/minute, 5.454 kWh/kg and 4.763 kWh/kg, and 0.204 kg/kWh and 0.241 kg/kWh for SA-FBDIBF and SAHP-FBDIBF, respectively. In SA-FBDIBF and SAHP-FBDIBF, the dryer thermal efficiencies were average values of 12.28% and 15.44%; in addition, the pickup efficiencies were 33.55% and 43.84% on average, whereas the average solar and biomass fractions were 10.9% and 10.6% and 36.6% and 30.4% for SA-FBDIBF and SAHP-FBDIBF, respectively. The drying of paddy occurred in the falling rate period. The experimental dimensionless moisture content data were fitted to three mathematical models. Page’s model was found best to describe the drying behaviour of paddy.

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Reliability Evaluation and Failure Rate Prediction of Ilmenite Fluidized Bed Dryer at IREL, Chavara

International Review on Computers and Software (IRECOS) ◽

10.15866/irecos.v15i1.19316 ◽

2020 ◽

Vol 15 (1) ◽

pp. 26

Author(s):

J. Abdul Jaleel ◽

Minchu Vijayan

Keyword(s):

Fluidized Bed ◽

Failure Rate ◽

Reliability Evaluation ◽

Fluidized Bed Dryer ◽

Rate Prediction

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Modeling a Fluidized Bed Dryer through Computational Fluid Dynamics and Discrete Element Method

Chemical Engineering & Technology ◽

10.1002/ceat.202100134 ◽

2021 ◽

Author(s):

Sebastian Alexander Pérez Cortés ◽

Yerko Rafael Aguilera Carvajal ◽

Juan Pablo Vargas Norambuena ◽

Javier Antonio Norambuena Vásquez ◽

Juan Andrés Jarufe Troncoso ◽

...

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Discrete Element Method ◽

Fluidized Bed ◽

Discrete Element ◽

Fluidized Bed Dryer ◽

Element Method

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Fluidized Bed Drying of Pumpkin (Cucurbita sp.) Seeds

Foods ◽

10.3390/foods8050147 ◽

2019 ◽

Vol 8 (5) ◽

pp. 147 ◽

Cited By ~ 1

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.

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Design of Hybrid Drying- Dedusting Unit Processor for Rough Rice Processing

International Journal of Food Engineering ◽

10.2202/1556-3758.1487 ◽

2008 ◽

Vol 4 (6) ◽

Author(s):

Law Chung Lim ◽

Wan Ramli Wan Daud

Keyword(s):

Moisture Content ◽

Fluidized Bed ◽

Separation Efficiency ◽

Cross Flow ◽

Drying Kinetics ◽

Rice Husks ◽

Two Stage ◽

Fluidized Bed Dryer ◽

Rough Rice ◽

Superficial Gas Velocity

Advanced drying technology enables drying of rough rice and dedusting of rice husks to be carried out simultaneously in the same unit processor. This paper reports the efficiency of dedusting of rice husks in a two-stage inclined cross flow fluidized bed dryer and the drying kinetics of rough rice in a batch fluidized bed dryer as well as the conceptual design of a hybrid drying dedusting unit processor. Experimental works had been carried out using rough rice (a Group D particle according to Geldart classification of powders) in a 2.5 m height two-stage inclined fluidized bed column of cross sectional area of 0.61m x 0.15m and a 3 m high batch fluidized bed dryer. The objectives of the study was to investigate the separation efficiency of dedusting of rice husks in the two-stage cross flow fluidized bed dryer and to study the drying kinetics of rough rice drying in the batch fluidized bed dryer. The experimental results showed that the dedusting separation efficiency at low superficial gas velocity gave unsatisfactory separation of merely 40% of rice husks. At higher superficial gas velocity, separation efficiency of rice husks as high as 93% was achieved. In addition, higher distributor inclination angle gave slightly improved separation efficiency. The drying kinetics showed that the residence time that is required to reduce the moisture content of rough rice to 18% (intermediate storage moisture content for second stage drying) is 3 minutes whereas the residence time that is required to reduce the moisture content to 13% (desirable final moisture content) is approximately 10 minutes regardless of the effect of kernel cracking. It was also found that higher drying temperatures gave higher drying rate. A conceptual design has been developed based on the results obtained in the studies. In order to maximize the heat utilization and to carry out two processes viz. dedusting and drying in one unit processor, it is suggested that drying dedusting can be carried out in a multistage mode where drying is taken place at each stage while dedusting is taking place at the upper stage. This concept can be applied to a packed bed or a fluidized bed unit processor.

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KARAKTERISTIK FISIKOKIMIA PATI SAGU HASIL PENGERINGAN SECARA FLUIDISASI MENGGUNAKAN ALAT PENGERING CROSS FLOW FLUIDIZED BED BERTENAGA SURYA DAN BIOMASSA

REAKTOR ◽

10.14710/reaktor.13.3.155-164 ◽

2011 ◽

Vol 13 (3) ◽

pp. 155 ◽

Cited By ~ 6

Author(s):

Abadi Jading ◽

Eduard Tethool ◽

Paulus Payung ◽

Sarman Gultom

Keyword(s):

Chemical Composition ◽

Fluidized Bed ◽

Cross Flow ◽

Physicochemical Characteristics ◽

Sago Starch ◽

Drying Time ◽

Fluidized Bed Dryer ◽

Conventional Drying ◽

Fluidized Bed Drying

PHYSICOCHEMICAL CHARACTERISTICS OF SAGO STARCH OBTAINED FROM FLUIDIZED BED DRYING USING SOLAR AND BIOMASS POWERED CROSS FLOW FLUIDIZED BED DRYER. The research aim is to study the comparative quality of sago starch drying results using cross flow fluidized bed dryer powered by solar and biomass in conventional drying, particularly the chemical composition and physicochemical characteristics. This research was conducted through a drying phase of wet sago starch using a cross flow fluidized bed dryer, and drying in conventional as well as dried sago starch quality testing results are drying. The results of this study indicate that dry sago starch which has been drained by means of cross flow fluidized bed dryer has a chemical composition that does not vary much with starch which is dried by conventional drying, so that the dried sago starch produced by the dryer is very good. On the other hand the use of dryers is the more correct because the physicochemical properties of sago starch using a low drying temperature and drying time is short. Tujuan penelitian ini adalah mempelajari perbandingan kualitas pati sagu hasil pengeringan menggunakan alat pengering cross flow fluidized bed bertenaga surya dan biomassa dengan pengeringan secara konvensional, khususnya komposisi kimia dan karakteristik fisikokimia. Penelitian ini dilakukan melalui beberapa tahapan yaitu pengeringan pati sagu basah menggunakan alat pengering cross flow fluidized bed, pengeringan secara konvensional serta pengujian kualitas pati sagu kering hasil pengeringan. Hasil dari penelitian ini menunjukkan bahwa pati sagu kering yang telah dikeringkan dengan alat pengering cross flow fluidized bed memiliki komposisi kimia yang tidak berbeda jauh dengan pati yang dikeringkan dengan cara pengeringan secara konvensional, sehingga pati sagu kering yang dihasilkan oleh alat pengering tersebut sangat baik. Di sisi lain penggunaan alat pengering ini semakin memperbaiki sifat fisikokimia pati sagu sebab menggunakan suhu pengeringan yang rendah dan waktu pengeringan yang singkat. Kata Kunci: pengering unggun terfluidakan; fisikokimia; pati sagu

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Method of producing parboiled rice without steam by fluidized bed dryer

E3S Web of Conferences ◽

10.1051/e3sconf/202018701002 ◽

2020 ◽

Vol 187 ◽

pp. 01002

Author(s):

Asadayuth Mitsiri ◽

Somkiat Prachayawarakorn ◽

Sakamon Devahastin ◽

Wathanyoo Rordprapat ◽

Somchart Soponronnarit

Keyword(s):

Moisture Content ◽

Fluidized Bed ◽

Rice Yield ◽

Experimental Result ◽

Rice Starch ◽

Parboiled Rice ◽

Starch Gelatinization ◽

Fluidized Bed Dryer ◽

Head Rice ◽

Head Rice Yield

A more simple methodology of producing parboiled rice is subject to be investigated in this work with proposed the method, the gelatinization of rice starch, commonly taking place at the steaming step in the traditional process, and drying are combined and replaced by a hot air fluidized bed dryer. A pilot-scale continuous fluidized bed, with a maximum capacity of 140-150 kg/h, has been designed, constructed and tested. Suphanburi 90 paddy variety with high amylose content was dipped into hot water at temperatures of 70, 80, 83°C for 4.0, 3.3, 3.2 h, respectively, to get the moisture content around 47-55% db and dried at 150-170°C using air speed of 3.5 m/s. The paddy bed depth within the dryer was 3 and 5 cm. In the dryer operation, the exhaust air was fully recycled and reheated again by 30 kW electrical heaters to the desired temperature. The experimental result has shown that parboiled rice with a different degree of starch gelatinization could be produced by this technique. The degree ranged between 80-100% as examined by differential scanning calorimeter. The exit moisture content was given in a range of 14-21% db, relying on the drying temperature and soaking time. The aforementioned exit moisture contents were not a detrimental effect on head rice yield although the tempering was not included. The head rice yield was given in the range of 59-66%, depending on the degree of starch gelatinization. The starch granules lost their original shape as revealed by scanning electron microscope.

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