A computational model for supercritical water oxidation of organic toxic wastes

Zhou, Ning; Krishnan, Anantha; Vogel, Frédéric; Peters, William A.

doi:10.1016/s1093-0191(00)00011-3

Cited by 44 publications

(23 citation statements)

References 7 publications

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“…The development of more complex reactor designs, such as the reverse flow reactor vessel or the transpiring wall reactor, and the awareness of the importance of the reagents mixing [40] have opened the way to more complicated models using CFD tools [18,33,39] to accurately describe the flow pattern inside the reactor. With this objective, the momentum balance must be solved and accurate values of the transport properties are needed.…”

Section: Propertiesmentioning

confidence: 99%

“…Anikeev et al [20] RKS -Bermejo et al [26] VTPR IM (NIST) a Chen et al [27] Pure water Pure water Donatini et al [15] PSRK -Dutournié et al [28] Pure water Pure water Lavric et al [6] PR PR Leybros et al [29] IM (VTPR) a IM (VTPR) a Lieball [18] IM (VTPR) a IM (VTPR) a Moussière et al [30] Ideal Mixing Ideal Mixing Moussière et al [31] IM (NIST) a IM (NIST) a Narayanan et al [32] IM (VTPR) a IM (VTPR) a Oh et al [33] IM (SR-Polar, NIST) a , b IM (SR-Polar, NIST) a , b Queiroz et al [34] VTPR PR Queiroz et al [35] VTPR PR Sierra-Pallares et al [36] VTPR VTPR Vielcazals et al [37] Pure water Pure water Zhou et al [38] IM (NIST) a IM (NIST) a Zhou et al [39] SUPERTRAPP SUPERTRAPP a IM stands for ideal mixture. The property of each pure component is calculated by the method inside parenthesis.…”

Section: Workmentioning

confidence: 99%

“…These reactors can present flow patterns quite different from plug flow or perfectly mixed. Models for these new reactors are also more complicated and usually use CFD tools [18,26,31,32,39]. Thus, this family of models solves conservation equations, the applicable constitutive equations, and dynamically calculates transport properties at different conditions as needed.…”

Section: Modeling Of Scwomentioning

confidence: 99%

See 2 more Smart Citations

Supercritical water oxidation with hydrothermal flame as internal heat source: Efficient and clean energy production from waste

Queiroz

Bermejo

Mato

et al. 2015

The Journal of Supercritical Fluids

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Section: Propertiesmentioning

confidence: 99%

Section: Workmentioning

confidence: 99%

Section: Modeling Of Scwomentioning

confidence: 99%

See 1 more Smart Citation

Supercritical water oxidation with hydrothermal flame as internal heat source: Efficient and clean energy production from waste

Queiroz

Bermejo

Mato

et al. 2015

The Journal of Supercritical Fluids

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“…Since water is the main component of the SCWO reaction mixtures, the density of SCWO reaction mixtures is presumed to be that of pure water at supercritical conditions [16]. Steam tables provide density data for pure water [68], and it can be also estimated using equations of state e.g.…”

Section: Calculations For Kineticsmentioning

confidence: 99%

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Akgün

Söğüt

2014

Biofuels and Biorefineries

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Water behaves as an acidic and alkaline precursor for acidic or basic reactions, since the formation of both H 3 O C and OH -ions takes place in accordance with the self-dissociation of water at near-critical and above supercritical (T c D 374 ı C, P c D 22.1 MPa) conditions. Therefore, supercritical water is considered both as a solvent for organic materials and as a reactant at processes such as the oxidative treatment of wastewaters, the gasification of aqueous organic solutions and the production of fine metal oxide particles. Supercritical water oxidation is a very efficient method for wastewater treatment, which is based on oxidation of organic compounds in aqueous media above critical temperature and pressure conditions of pure water.In this chapter, general information on supercritical water oxidation processes is given, effects of operational parameters such as temperature, pressure, reaction time, waste and oxidant concentration on waste treatment are discussed, and applied scientific methods and practical solutions to possible operational problems such as corrosion, salt deposition and carbonization are compiled in detail. Treatment of industrial wastewaters such as olive mill, textile dyehouse, cheese whey and commercial pesticide with high environmental hazard potential are subjected and evaluated in order to understand the effects of reactor temperature, organics and oxidant concentrations, residence time and reactor pressure. Hydrothermal degradation and oxidation kinetics of wastewater are stracked in terms of total organic carbon (TOC) and analyzed, followed by discussion of supercritical water oxidation rate models.

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“…In the recent literature, there are several approaches to the modeling and simulation of supercritical water oxidation processes through commercial computational fluid dynamics (CFD) simulation programs such as CFD-ACE (Zhou et al, 2000), STREAM (Masuda et al, 2006), Ansys CFX (Narayanan et al, 2008), NPHASE (Gallaway et al, 2008), COMSOL Multiphysics (Marulanda and Bolaños, 2008) and Fluent (Bermejo et al, 2010). These studies have focused on predicting the final conversion and temperature profile that can be achieved in an existing lab scale reactor and comparing the simulation with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Reacting flow simulations of supercritical water oxidation of PCB-contaminated transformer oil in a pilot plant reactor

Marulanda

2011

Braz. J. Chem. Eng.

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-The scale-up of a supercritical water oxidation process, based on recent advancements in kinetic aspects, reactor configuration and optimal operational conditions, depends on the research and development of simulation tools, which allow the designer not only to understand the complex multiphysics phenomena that describe the system, but also to optimize the operational parameters to attain the best profit for the process and guarantee its safe operation. Accordingly, this paper reports a multiphysics simulation with the CFD software Comsol Multiphysics 3.3 of a pilot plant reactor for the supercritical water oxidation of a heavily PCBcontaminated mineral transformer oil. The proposed model was based on available information for the kinetic aspects of the complex mixture and the optimal operational conditions obtained in a lab-scale continuous supercritical water oxidation unit. The pilot plant simulation results indicate that it is not feasible to scale-up directly the optimal operational conditions obtained in the isothermal lab-scale experiments, due to the excess heat released by the exothermic oxidation reactions that result in outlet temperatures higher than 600°C, even at reactor inlet temperatures as low as 400°C. Consequently, different alternatives such as decreasing organic flowrates or a new reactor set-up with multiple oxidant injections should be considered to guarantee a safe operation.

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A computational model for supercritical water oxidation of organic toxic wastes

Cited by 44 publications

References 7 publications

Supercritical water oxidation with hydrothermal flame as internal heat source: Efficient and clean energy production from waste

Supercritical water oxidation with hydrothermal flame as internal heat source: Efficient and clean energy production from waste

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Reacting flow simulations of supercritical water oxidation of PCB-contaminated transformer oil in a pilot plant reactor

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