Modeling and simulation of direct contact evaporators

Campos, Flavio Barboza; Lage, Paulo L.C.

doi:10.1590/s0104-66322001000300007

Cited by 6 publications

(17 citation statements)

References 7 publications

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“…The predicted T vn value seems reasonable, but the estimated T v value is too high. This indicates that, as remarked by Campos and Lage [15], the gas distributor heat transfer model of Queiroz [11] needs improvement.…”

Section: A Case Studymentioning

confidence: 93%

“…In the following, the steady-state calculations of the model developed by Queiroz [11] was used. This model was reported by Campos and Lage [15], where the reader should look for more details.…”

Section: The Gas Distributor Heat Transfer Modelmentioning

confidence: 97%

“…Usually, the evaporator is assumed to be adiabatic: Q p = 0. The transient liquid-phase model can be found in Campos and Lage [15]. For design, m Ç e and X e are known and X s is specified for the desired concentration.…”

Section: Liquid-phase Modelmentioning

confidence: 99%

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Advances in Direct Contact Evaporator Design

Lage¹,

Campos²

2004

Chem Eng & Technol

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Direct contact evaporators are nonisothermal bubble columns where a hot gas, usually obtained by combustion, is used to heat and vaporize the solvent of a given solution that needs to be concentrated. The design of such equipment has been relied on experimental data or on a simplified method that assumes that the gas leaves the evaporator at equilibrium with the liquid phase, giving no information about the necessary bubbling height to attain such equilibrium conditions. Recent advances in the heat and mass transfer processes during the formation and ascension of superheated bubbles together with simple mass and energy balances in the liquid phase and gas distributor system were used to develop a more detailed design procedure. The accuracy of both design procedures are compared to available experimental data in a direct contact evaporator operating in semibatch mode. The new design method agreed well with the experimental data.

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Section: A Case Studymentioning

confidence: 93%

Section: The Gas Distributor Heat Transfer Modelmentioning

confidence: 97%

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Advances in Direct Contact Evaporator Design

Lage¹,

Campos²

2004

Chem Eng & Technol

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“…In fact, the neglect of Q D has already led some authors [34] to the erroneous conclusion that DCEs are capable of removing heat from the surroundings. Its value, as well as the one associated with heat losses, can be computed with the aid of an overall heat-transfer coefficient, either theoretically estimated [198] or experimentally determined [160,200] for a given sparger design.…”

Section: Modeling and Simulationmentioning

confidence: 99%

“…(25) and (26) are directly applied in the computation of the evaporation and sensible heat transfer rates in the equipment [198]:…”

Section: Evmentioning

confidence: 99%

Gas-Liquid Direct-Contact Evaporation: A Review

Ribeiro¹,

Lage²

2005

Chem. Eng. Technol.

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Gas-liquid direct-contact evaporators are characterized by the bubbling of a superheated gas through the solution to be concentrated. In other words, they are nonisothermal bubble columns. Despite their simplicity of construction, these units exhibit rather complex hydrodynamics and, similar to what occurs to isothermal bubble columns, the design of such units still poses a problem. The present paper reviews the literature regarding this kind of equipment, addressing both experimental studies and modeling efforts. The covered issues include classic and potential applications, bubbling regimes, gas holdup and bubble size distributions, as well as mathematical models proposed for simulating the unit. Additionally, pertinent literature on isothermal bubble columns is also discussed. Recommendations are made for future research.

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Desalination; a comprehensive and practical assessment on challenges and opportunities ahead

Akram¹

2021

Preprint

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Modeling and simulation of direct contact evaporators

Cited by 6 publications

References 7 publications

Advances in Direct Contact Evaporator Design

Advances in Direct Contact Evaporator Design

Gas-Liquid Direct-Contact Evaporation: A Review

Desalination; a comprehensive and practical assessment on challenges and opportunities ahead

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