Experimental study on the mixing characteristics inside an inner preheating transpiring-wall reactor for supercritical water oxidation

Zhang, Fengming; Su, Chuangjian; Chen, Zhiyu; Chen, Jiulin

doi:10.1016/j.supflu.2019.104682

Cited by 14 publications

(6 citation statements)

References 27 publications

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“…Simulation area was discretized through structural quadrilateral grids, of which total number was 1.5 Â 10. 5 Boundary layer was densified at the internal surface of the porous transpiring wall to improve calculation accuracy. The grid independence verification was conducted to eliminate the computational errors caused by grids.…”

Section: Physical Model and Boundary Conditionsmentioning

confidence: 99%

Effects of structural parameters on water film properties of transpiring wall reactor

Feng

Wang

et al. 2021

AIChE Journal

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Corrosion and salt deposition problems severely restrict the industrialization of supercritical water oxidation. Transpiring wall reactor can effectively weaken these two problems by a protective water film. In this work, methanol was selected as organic matter, and the influences of vital structural parameters on water film properties and organic matter removal were studied via numerical simulation. The results indicate that higher than 99% of methanol conversion could be obtained and hardly affected by transpiration water layer, transpiring wall porosity and inner diameter.Increasing layer and porosity reduced reactor center temperature, but inner diameter's influence was lower relatively. Water film temperature reduced but coverage rate raised as layer, porosity, and inner diameter increased. Notably, the whole reactor was in supercritical state and coverage rate was only approximately 85% in the case of one layer. Increasing reactor length affected slightly the volume of the upper supercritical zone but enlarged the subcritical zone.

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Section: Physical Model and Boundary Conditionsmentioning

confidence: 99%

Effects of structural parameters on water film properties of transpiring wall reactor

Feng

Wang

et al. 2021

AIChE Journal

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“…Given the inlet stream's conditions and flowrate, constraining outflows to satisfy experimental conditions as well as the energy balance, and assuming that light gases came out in the top stream and inerts came out in the bottom stream, the water flowrate distribution between the top and bottom could be derived, mass balances completed, and outlet streams completely determined. This approach is only strictly correct for thermodynamic equilibrium, and transfer dynamics or spatial distribution issues [36] may have detracted from its correctness, but considering the experimental residence times (20-30 s) and with steady-state operation energy analysis purposes, it can be considered acceptable.…”

Section: Supercritical Water Oxidation Reactormentioning

confidence: 99%

“…GT operating parameters were taken from the lowest range of CHP setups (3-7 MWe) in the U.S, EPA (Environmental Protection Agency) Catalogue of CHP Technology [36]. The specific values were: compression ratio = 30, air to fuel ratio (AFR) = 3.5, η s = 0.85 for the compressor and η s = 0.90 for the expander.…”

Section: Gas Turbine (Gt) and Combined Heat And Power (Chp)mentioning

confidence: 99%

Analysis of the Energy Flow in a Municipal Wastewater Treatment Plant Based on a Supercritical Water Oxidation Reactor Coupled to a Gas Turbine

et al. 2021

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Biological municipal wastewater treatments lead to high sludge generation and long retention times, and the possibilities for recovery of the energy content of the input waste stream are very limited due to the low operating temperature. As an alternative, we propose a sequence of exclusively physicochemical, non-biological stages that avoid sludge production, while producing high-grade energy outflows favoring recovery, all in shorter times. Ultrafiltration and evaporation units provide a front-end concentration block, while a supercritical water oxidation reactor serves as the main treatment unit. A new approach for energy recovery from the effluent of the reactor is proposed, based on its injection in a gas turbine, which presents advantages over simpler direct utilization methods from operational and efficiency points of view. A process layout and a numerical simulation to assess this proposal have been developed. Results show that the model process, characterized with proven operating parameters, found a range of feasible solutions to the treatment problem with similar energy costs, at a fast speed, without sludge production, while co-generating the municipality’s average electricity consumption.

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“…2000), supercritical degrading refractory organic wastewater process performance (Zhang et al. 2020 c ), lithium battery nanoparticles production in a supercritical hydrothermal synthesis process (Hong et al. 2013), supercritical combustion performance and pollutant emissions (Cheng et al.…”

Section: Introductionmentioning

confidence: 99%

Response of supercritical round jets to various excitation modes

et al. 2021

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Experimental study on the mixing characteristics inside an inner preheating transpiring-wall reactor for supercritical water oxidation

Cited by 14 publications

References 27 publications

Effects of structural parameters on water film properties of transpiring wall reactor

Effects of structural parameters on water film properties of transpiring wall reactor

Analysis of the Energy Flow in a Municipal Wastewater Treatment Plant Based on a Supercritical Water Oxidation Reactor Coupled to a Gas Turbine

Response of supercritical round jets to various excitation modes

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