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Design of a Small-Scale Supercritical Water Oxidation Reactor. Part I: Experimental Performance and Characterization

preprint
submitted on 01.11.2020, 05:44 and posted on 02.11.2020, 13:21 by Stuart Moore, Brian Pinkard, Anmol L. Purohit, John Misquith, John Kramlich, Per G. Reinhall, Igor V. Novosselov

A small-scale supercritical water oxidation reactor is designed and fabricated to study the destruction of hazardous wastes. The downward bulk flow is heated with the introduction of pilot fuel (ethanol/water mixture), and oxidant (H2O2/water mixture). Both streams are introduced coaxially. The fuel dilution is varied from 2 to 7 mol% ethanol/water, and the oxidant-to-fuel stoichiometric equivalence ratio (ΦAF), is varied from 1.1 to 1.5. Higher ethanol concentrations in the pilot fuel stream and operation near-stoichiometric results in a more stratified temperature profile, i.e., highest local fluid temperatures near the top and the lowest temperatures at the bottom of the reactor. Steady operation at 603.5 °C is achieved with a nominal residence time of 25.3 s at 7 mol% fuel dilution and ΦAF of 1.1. At the lowest pilot fuel dilution (2 mol%), the temperature profile is nearly uniform, approaching a distributed reaction regime.

History

Email Address of Submitting Author

pinkardb@uw.edu

Institution

University of Washington

Country

United States

ORCID For Submitting Author

0000-0002-4517-4712

Declaration of Conflict of Interest

No conflict of interest

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