Numerical Simulation on Superheated Steam Fluidized Bed Drying: II. Experiments and Numerical Simulation

Shi, Yuhua; Xiao, Zhenggang; Wang, Zhenhua; Liu, Xiangdong; Yang, Dongya

doi:10.1080/07373937.2011.592050

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…Work has been undertaken by Kim et al, observing the effect of humidified air (up to 40% relative humidity) on drying rate. With relatively little experimental information available, modeling equations have been used to approximate the drying of a particle or fluidized bed under a steam atmosphere; − however, these equations were primarily used for ceramic particles, fixed beds, or single particle drying.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Superheated Steam and Air Fluidized-Bed Drying Characteristics of Victorian Brown Coals

2013

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Brown coals represent a large resource for Victoria, with reserves of over 500 years at the current rate of consumption. However, its high moisture content (∼60%) impedes its utilization in an efficient manner. Information on drying kinetics of these coals is still scarce, affecting the development of economic and efficient drying technology. This experimental and modeling study presents a comparison of the drying kinetics between steam fluidized-bed drying and air fluidized-bed drying of three Victorian brown coals: Loy Yang, Yallourn, and Morwell. The effects of gas temperature (100−200 °C), gas velocity (0.32−0.61 m/s), and particle size (0.5−1.7 mm) on the drying kinetics have been examined. Both air and steam fluidized bed drying has been found to result in similar trends, with air drying having shorter drying times compared to steam drying. Increase in temperature and velocity, and a reduced particle size decreases the length of time required for complete drying to occur. Comparing air to steam fluidized bed drying, the relative drying ratios for a similar conditions (such as 130−170 °C) remains consistent, with the exception of particle size. The resultant 130 °C dried coal was used to analyze the moisture readsorption properties of the coals. The data show that steam fluidized-bed dried coals readsorb less moisture than air fluidized-bed dried coal, regardless of the coal type, with an average difference in moisture of 1.6%. The physical and chemical characterization of dried coal shows that moisture readsorption is a function of the oxygen functional group content. Several drying models available in the literature were compared against the experimental data acquired during this study. The results indicate that the Midilli− Kucuk model accurately describes the drying kinetics of the three investigated Victorian brown coals.

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Section: Resultsmentioning

confidence: 99%

Comparison of Superheated Steam and Air Fluidized-Bed Drying Characteristics of Victorian Brown Coals

2013

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“…When potato chips were placed in the drying chamber at a stable superheated steam temperature, the superheated steam condensed on the surface of potato chips. One of the main reasons was that the heat release in the condensation period caused the temperature to quickly climb to the saturation temperature of water under operational pressure (Shi et al, 2011). The condensation period lasted less than 30 s at three superheated steam temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…Superheated steam drying was discovered to have distinct volumetric manifestations for different types of materials, which differed from other drying methods. Shi et al (2011) discovered that the average volume shrinkage of rapeseed after superheated steam drying was only 7.8%, whereas Erkinbaev et al (2019) discovered that the distillers' spent grain pellets expanded up to 133%. Some studies showed that deformation and heat and mass transfer could not be studied separately, so the mathematical and geometric models were combined to discuss the effect of deformation on heat and mass transmission.…”

mentioning

confidence: 99%

Simulation and experimental study on the effect of deformation on heat and mass transfer in potato chips during superheated steam drying

Fu,

Zheng,

Ren

et al. 2023

J Food Process Engineering

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Superheated steam drying is a drying technology with enormous potential and numerous advantages. Volume change and substantial deformation will occur on the materials to be dried during the superheated steam drying, which would affect the heat and mass transfer of the sample. However, the influence mechanism is not clear. Therefore, the nonuniform volume change of potato slices was studied, and the deformation model (DM) and the non‐DM (NDM) were constructed and verified to study the heat and mass transfer processes of the sample. The results showed that there was little difference between the measured and simulated temperatures based on DM and NDM with a maximum error of 4.22% and 5.03%, respectively, but there was obvious difference between simulated moisture contents with a maximum error of 5.76% and 12.21%, respectively. The volume in DM was in good agreement with the experimental data. Temperature distribution and moisture distribution in potato chips during superheated steam drying were nonuniform and the maximum temperature gradient and moisture gradient appeared in the early period. The moisture gradient existed in the whole drying process, and the stress caused by the moisture gradient was the main factor causing the drying deformation.Practical applicationsThis work can reveal that the volume change and substantial deformation have a significant impact on the heat and mass transfer during drying. In production practice, there are many similar phenomena. The results would be helpful to understand the heat and mass transfer mechanism, optimize quality parameters to obtain better products in potato drying industry, and expand the applied range of the superheated steam drying technology.

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“…Mujumdar has discussed the principles, advantages and limitations as well as diverse applications of superheated steam dr ying technologies in a number of papers and books 39,40,51) , including the Handbook of Industrial Drying 1) . There have been several attempts to model heat and mass transfer during SSD process 52,53) . However, SSD has several limitations such as complexity of the process, making the system leak-proof to avoid leakage of atmospheric air in the system which results in problems during condensation and compression if the steam is recycled.…”

Section: Superheated Steam Dr Yingmentioning

confidence: 99%

Some Recent Advances in Drying Technologies to Produce Particulate Solids

Lee

Jangam

Mujumdar

2013

KONA

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Numerical Simulation on Superheated Steam Fluidized Bed Drying: II. Experiments and Numerical Simulation

Cited by 13 publications

References 23 publications

Comparison of Superheated Steam and Air Fluidized-Bed Drying Characteristics of Victorian Brown Coals

Comparison of Superheated Steam and Air Fluidized-Bed Drying Characteristics of Victorian Brown Coals

Simulation and experimental study on the effect of deformation on heat and mass transfer in potato chips during superheated steam drying

Some Recent Advances in Drying Technologies to Produce Particulate Solids

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