Determination of the drying rate and effective diffusivity coefficients during convective drying of two-phase olive mill waste at rotary dryers drying conditions for their application

Cruz, Francisco J. Gómez-de la; Carnicero, José Manuel Palomar; Hernández-Escobedo, Quetzalcoatl; Cruz-Peragón, Fernando

doi:10.1016/j.renene.2020.02.062

Cited by 28 publications

(10 citation statements)

References 36 publications

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“…moisture content (X e ) and the drying curve of a falling-rate drying period [59,60,66]. The kinetic data for drying of wet olive pomace were obtained from [9]. The mass and heat transfer coefficients were calculated from Eqs.…”

Section: Rotary Drum Dryermentioning

confidence: 99%

“…Olive pomace must be continuously transported to olive pomace oil extraction plants in cargo trucks, because its accumulation at oil mills can cause production stoppages and substantial economic losses [9]. In these plants, the wet olive pomace from oil mills is deposited in large ponds for subsequent drying and eventual extraction of crude olive pomace oil, generating exhausted olive pomace (also called orujillo) as a by-product.…”

Section: Introductionmentioning

confidence: 99%

“…The required thermal energy for such purpose is generally supplied by burning large amounts of exhausted pomace in furnaces or even by using fossil fuels such as natural gas in reciprocating internal combustion engines, leading to large amounts of carbon dioxide emissions into the atmosphere [10]. Drying of wet pomace has been traditionally performed in large-scale continuous rotary drum dryers through which an air stream at high inlet temperatures (400-800 °C) and velocities (1-7 m/s) is driven [9]. The dried pomace is eventually subjected to a solid-liquid extraction process of the crude pomace oil with an organic solvent, usually hexane.…”

Section: Introductionmentioning

confidence: 99%

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An integrated gasification plant for electric power generation from wet biomass: toward a sustainable production in the olive oil industry

Aguado

Vera

Jurado

et al. 2022

Biomass Conv. Bioref.

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This research work proposes an integrated gasification plant for simultaneous generation of renewable electricity and drying of olive pomace, a thick sludge with a moisture content close to 60–70% (wet basis), which constitutes by far the most abundant by-product in the Spanish olive oil industry. Due to its massive rate of production and increasing associated transportation costs, olive pomace management currently represents a substantial expense for oil mills. The integrated gasification plant, which can be installed directly at oil mills, consists of a pelletizer, a downdraft gasifier under autothermal operation fueled with dried olive pomace pellets, a producer gas cooling and cleaning unit and a microturbine as power generation unit. The wet olive pomace continuously produced in oil mills is eventually dried in a co-current flow rotary drum dryer with the hot exhaust gases leaving the microturbine at temperatures close to 300 °C, allowing a self-sufficient operation of the integrated gasification plant. The integrated gasification plant was modeled using Aspen Plus® process simulator. The developed model was validated against experimental and simulation results of relevant works. Under optimum operating conditions, the electrical efficiency of the proposed plant is 18.8%, while the additional drying stage allows achieving an overall efficiency of 51.0%. Electricity consumption by the pelletizer and ancillary equipment represents 10–20% of the net electric power generation from the microturbine. However, since the integrated gasification plant is fueled with an inexpensive by-product of olive oil production that is massively produced on-site, the plant performance parameters are remarkably satisfactory.

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Section: Rotary Drum Dryermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An integrated gasification plant for electric power generation from wet biomass: toward a sustainable production in the olive oil industry

Aguado

Vera

Jurado

et al. 2022

Biomass Conv. Bioref.

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“…In the period of decreasing rate, on the other hand, the surface of the material is no longer saturated with water and the drying rate is controlled by the diffusion of moisture from the interior of the solid to the surface (Cruz et al, 2020). In this period, the heat transfer is not compensated by the mass transfer because the internal resistance to water transport becomes greater than the external resistance.…”

Section: Heat and Mass Transfermentioning

confidence: 99%

Determination and modeling of physical and aerodynamic properties of coffee beans ( Coffea arabica ) during the drying process

Araújo

Corrêa

Barbosa

et al. 2021

J. Food Process. Preserv.

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“…Only the highest air wind speed had a remarkable influence on total vapor flux according to results. CD of olive mill waste with different dimensions in a rotary dryer under the effects of varying AT and AV were investigated by Cruz et al (Gómez-de la Cruz et al , 2020). They calculated drying rate and effective diffusivity according to the experimental results for varying ATs and AVs.…”

Section: Introductionmentioning

confidence: 99%

Convective drying performance of porous moist objects under turbulent flow conditions: effects of object shape and material

Çoban

Selimefendigil

Öztop

2021

HFF

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Purpose The purpose of this paper is to examine the coupled heat and mass transport of different shaped porous moist objects in a rectangular channel under the effects of convective drying. Numerical simulations were performed under turbulent conditions for cylindrical, triangular and rectangular shaped different food products in a two-dimensional channel. Design/methodology/approach Finite element method was used for the unsteady problem and, effects of drying air velocity (AV) and temperature on transport mechanism were evaluated. Three different food materials were used for the circular shaped object and drying performance of the products under different conditions was compared. Findings Results showed that, changing the air temperature has an important effect on drying for all shaped objects and all materials. The same effect was seen for the AV as, increasing the velocity had positive effects on drying. Two identical objects were placed in the channel one behind the other, and this configuration showed that location of the object in the channel is also important for drying. The moisture content in the object at the front is lower than in the object behind at the end of drying. Originality/value This paper can provide technical support to optimize drying performance in the industry with comprehensive data for the process.

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Determination of the drying rate and effective diffusivity coefficients during convective drying of two-phase olive mill waste at rotary dryers drying conditions for their application

Cited by 28 publications

References 36 publications

An integrated gasification plant for electric power generation from wet biomass: toward a sustainable production in the olive oil industry

An integrated gasification plant for electric power generation from wet biomass: toward a sustainable production in the olive oil industry

Determination and modeling of physical and aerodynamic properties of coffee beans ( Coffea arabica ) during the drying process

Convective drying performance of porous moist objects under turbulent flow conditions: effects of object shape and material

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