Supercritical water oxidation of isopropyl alcohol was investigated in a pilot-scale reactor. A computationalfluid-dynamics model developed reveals the detailed flow field, chemical-component distribution, temperature distribution, and salt-particle trajectories in the reactor flow domain. The near-wall fluid temperature from the numerical analysis was compared with experimental temperature data. The temperature comparison was within a 3% error band. The effect of the chemical kinetic rate was investigated for four different rates. Turbulent salt-particle trajectories were also calculated to investigate the effect of particle sizes on salt deposit on the wall. Also, a method of calculating the adiabatic reaction temperature was developed to estimate reaction temperatures prior to a full numerical simulation.
This is an informal report intended for use as a preliminary or working document Work supported by t h e U. S. Department o f Energy A s s i s t a n t Secretary for Resource A p p l i c a t i o n , O f f i c e o f Geothermal, under DOE Contract No. DE-AC07-76ID01570. m EGZG Idaho DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. DISCLAIMER This book was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty. express or implied, or assumes any legal liability
The FLUENT computer code was used to construct a coupled fluid flow-chemical kinetics model of a MODAR bench scale reactor. This model predicted temperatures measured during MODAR test run 523.F very satisfactorily but required some modification to the measured boundary conditions. Several imprcwements to the model were made during a similar study of a MODAR pilot scale reactor. This report presents a rerun of the bench scale results using the updated model and shows better predictions than the initial runs. As before, the results of these calculations indicate that for better model validation, we need to obtain more accurate boundary conditions in future test runs.iii iv DISCLAIMERPortions of this document may be illegible in electronic irnage products. Images are produced from the best available original document. SUMMARYIn the SCWO process, organics are oxidized in the presence of air and water at conditions above the critical temperature and pressure of water. This process is being evaluated by the U.S. DOE for extension to the treatment of mixed wastes by investigating the performance of bench and pilot scale units in treating hazardous wastes and surrogate mixed wastes. Since these small scale units have proven to be very effective waste reducers, it is desired to scale them up to the size of a production facility.In order to use the small scale Iesults properly in designing the larger scale units, it is necessary to create coupled flow-chemical kinetics model of the bench and pilot scale SCWO reactors, validate their accuracy against the measured data, and then use the same modeling techniques to extrapolate the results to the larger scales. Then, when the larger scale plant is built and tested, the extrapolation procedures can themselves be validated for subsequent use.The detailed flow-chemical kinetics models will also provide the capability of modeling the effects of chemical corrosion and salt formation, which, too, are strongly coupled to the flow and chemical compositions. No simple scaling will be able to predict the magnitudes and extent of these effects, and extrapolation from a specific test condition to another would be extremely difficult, if not impossible, without a coupled code.A previous report presented thc: rationale used to select a CFD code for SCWO reactor thermal hydraulic studies, and then, using the selected code, a model of a MODAR bench-scale vessel reactor was made and compared with test results from that MODAR reactor. Subsequent to that study, another CFD model was created for a MODAR pilot scale reactor and test. During the pilot scale study, the model was improved in several areas. We have now rerun the bench scale study with the more accurate model and hive found that the results are more consistent. This report summarizes these final results for MODAR Run 523.f.Although the results of the model have been improved, this study still shows that more accurate boundary conditions (e.g., input flows and temperatures, wall temperatures) are required to be able to perform...
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