Unsteady behaviour of hydrothermal oxidation reactors: theoretical and numerical studies near the critical point

Dutournié, Patrick; Mercadier, Jacques

doi:10.1016/j.supflu.2005.01.004

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…Consequently, current disposal methods are increasingly unpopular with the public. It is likely that climbing wastewater-related energy costs, coupled with more stringent environmental regulations, will ultimately lead to the adoption of new wastewater processing and sludge disposal techniques (Dutourníe & Mercadier, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Supercritical water reactions have been demonstrated to be very stable. Temperature profiles represent a quasiconstant plateau near the critical conditions, and there is little or no reaction effect from pressure variations above a threshold point (Dutourníe & Mercadier, 2005). Nonetheless, the limited reaction effect from pressure could be attributed to the fact that high pressure stabilizes reaction energetics (Dutourníe & Mercadier, 2005).…”

Section: Effects Of Temperature Pressure and Residence Timementioning

confidence: 99%

“…Temperature profiles represent a quasiconstant plateau near the critical conditions, and there is little or no reaction effect from pressure variations above a threshold point (Dutourníe & Mercadier, 2005). Nonetheless, the limited reaction effect from pressure could be attributed to the fact that high pressure stabilizes reaction energetics (Dutourníe & Mercadier, 2005). Similarly, the potential for complex pressure effects should not be ignored because water properties including density, dielectric constant, and ion product increase with pressure (Guo et al, 2007).…”

Section: Effects Of Temperature Pressure and Residence Timementioning

confidence: 99%

See 2 more Smart Citations

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

Kamler¹,

Soria²

2012

Gasification for Practical Applications

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Section: Resultsmentioning

confidence: 99%

Section: Effects Of Temperature Pressure and Residence Timementioning

confidence: 99%

Section: Effects Of Temperature Pressure and Residence Timementioning

confidence: 99%

See 1 more Smart Citation

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

Kamler¹,

Soria²

2012

Gasification for Practical Applications

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“…Models like those need a kinetic model for the reaction and also good predictions of densities. Due their simplicity they can easily solve non-stationary reactors and can be used in control systems that demands fast responses [108,109]. To overcome the problems of corrosion and salt deposition, and to improve the energy recovery efficiency, several reactors with complex designs have been developed.…”

Section: Modeling Of Scwomentioning

confidence: 99%

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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“…Dutournié et al [11][12][13] developed numerical model to simulate the critical behaviour of the fluid in a tubular oxidation reactor during stationary and non-stationary operation. Their model was validated from experimental temperature profiles with a quasi-adiabatic hydrothermal oxidation tubular reactor.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on premixed hydrothermal combustion in tube reactor

Koido

Hirosaka

Kubo

et al. 2009

Combustion Theory and Modelling

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Premixed hydrothermal combustion of ethanol was numerically studied as a fundamental research to develop an energy conversion system utilising biomass and low quality oil. A simulation code available for oxidation of water solution mixture under sub/super critical conditions was developed. Lee-Kesler equation was selected as the equation of state. Chemical species of ethanol, oxygen, carbon dioxide and water, were considered as reactants and products of complete reaction. Mixing laws by Chung et al. and Wilke et al. were used for transport properties and that of Plöcker et al. was used for thermal properties and Lee-Kesler equation of state.Behaviours of ethanol oxidation under sub/super critical conditions were numerically simulated. For the reaction rate, we selected Schanzenbächer et al.'s expression obtained by the experiment under supercritical condition. Effects of preheat temperature, heat loss and flow velocity were examined by simulation. The differences of preheat temperatures led to the differences of temperature increase T around critical point because of the specific heat peak at the critical point. Larger flow velocity caused slower increase of ethanol conversion and temperature increase. Changes of reaction rate for different flow velocities showed that larger flow velocity caused thicker reaction zone and higher reaction peak than that for smaller one because of the fluid advection. From the calculation with different heat losses (different heat transfer rate coefficients α), twostep temperature decrease appeared for larger heat loss (α = 2.5 × 10 4 W·m −2 ·K −1 ) while monotonous temperature decrease appeared for smaller heat loss (α = 2.5×10 3 W·m −2 ·K −1 ).

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Unsteady behaviour of hydrothermal oxidation reactors: theoretical and numerical studies near the critical point

Cited by 9 publications

References 14 publications

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

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

Numerical study on premixed hydrothermal combustion in tube reactor

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