Drying Process in Electromagnetic Fields

Lima, Antônio Gilson Barbosa de; Delgado, J. M. P. Q.; Silva, E. G.; Neto, Severino Rodrigues de Farias; Santos, José Fortunato Ferreira; Lima, Wanderson Magno Paiva Barbosa de

doi:10.1007/978-3-319-19767-8_5

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…The sludge temperature for 100, 400, 600, and 800 W of microwave levels increased up to 114, 142, 215, and 204 °C, respectively. The sharp increase in the material temperature might be due to the phenomenon of thermal runaway (Ao et al 2018; Apinyavisit et al 2018;Barbosa de Lima et al 2016;Gaukel et al 2017). The phenomenon effect enhanced thermal degradation and the charring in the dried material.…”

Section: Effect Of Microwave Power Level On Sludge Temperaturementioning

confidence: 99%

Comparative Study of Hot Air Drying and Microwave Drying for Dewatered Sludge

Wulyapash

Phongphiphat

Towprayoon

2021

Preprint

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Large amounts of sludge are generated from wastewater treatment in seafood processing industries. Most of the dewatered sludge in Thailand is not utilized and disposed by landfilling. The dried sludge utilization as refuse-derived fuel (RDF) is an alternative solution due to the gross calorific value (GCV), which is greater than 21.9 MJ/kg. However, the key obstacle is its high moisture content of 87.4% (wet basis). Therefore, drying methods using hot air and microwave techniques were investigated for preparing dried sludge. The effects of hot air temperatures (100-150 °C) and microwave power levels (100-800 W) were compared on drying kinetics, specific energy consumption (SEC), and characteristics of the dried products. The results showed that drying times were decreased by increasing the hot air temperatures. In the same way, the increase in microwave power levels decreased the drying time. The application of microwaves contributed to reducing the drying time by more than 46% compared to the hot air. The reduction of drying times resulted in the saving SEC. The GCV of the dried sludge decreased with the decrease in the volatile matter (VM) due to the high component of VM as 79.5-80.3% (dry ash-free basis). The sludge dried by the microwaves showed a lower GCV than the hot air products. However, dried sludges still had high GCV (≥ 20.8 MJ/kg). Furthermore, the minimal variation of the product characteristics demonstrated that the microwave technique could be applied as an alternative drying method with a rapid process compared to the conventional hot air technique.

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Section: Effect Of Microwave Power Level On Sludge Temperaturementioning

confidence: 99%

Comparative Study of Hot Air Drying and Microwave Drying for Dewatered Sludge

Wulyapash

Phongphiphat

Towprayoon

2021

Preprint

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“…T=T 0 for t = 0 (5) -K T ∇T| s =h c (T eq -T)� s (6) According to Lima et al [4], an equation that has been reported in the literature for power absorbed and converted in heat during microwave irradiation can be expressed as:…”

Section: New Perspectives On Mass and Thermal Transport In Engineerin...mentioning

confidence: 99%

“…The rapid absorption of energy by the molecules of water causes rapid evaporation of water and higher drying rate of wet porous solid. Further, food products dried by microwave presented the best results regarding the characteristics of rehydration [4]. The ability of microwave radiation to penetrate dielectric materials can lead to controlled and precise heating, providing improvements and acceleration in the drying process [5].…”

Section: Introductionmentioning

confidence: 99%

Convective and Microwave Drying of Prolate Spheroidal Solids: Modeling and Simulation

Silva

Lima

et al. 2019

DDF

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This paper focuses some fundamental aspects of combined convective and microwave drying of prolate spheroidal solids. A transient mathematical modeling based on the diffusion theory (mass and heat balance equations) written in prolate spheroidal coordinates was derived and the importance of this procedure on the analysis of the drying process of wet porous solid, is also presented. Results pointed to the behavior of the moisture migration and heating of the solid with different aspect ratio. Solids with higher area/volume relationships dry and heat faster.

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