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Hydrothermal Ethanol Flames in Co-Flow Jets.

M C Hicks1, U G Hegde1,2, J J Kojima2

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|November 12, 2019
PubMed
Summary
This summary is machine-generated.

This study reports on ethanol hydrothermal flames autoignition and stabilization in supercritical water oxidation (SCWO). These diffusion flames exhibit laminar and turbulent features under varying flow conditions.

Keywords:
autoignitionhigh pressurehydrothermal flamejet injectionsupercritical water oxidation

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Area of Science:

  • Chemical Engineering
  • Combustion Science
  • Environmental Engineering

Background:

  • Supercritical Water Oxidation (SCWO) is an effective technology for waste treatment.
  • Understanding flame behavior in SCWO is crucial for process optimization.
  • Ethanol combustion in supercritical water presents unique challenges and opportunities.

Purpose of the Study:

  • To investigate the autoignition and stabilization of ethanol hydrothermal flames.
  • To characterize flame behavior under supercritical water conditions.
  • To analyze flame features using visual and spectroscopic methods.

Main Methods:

  • Utilized a co-flow injector for ethanol-water mixtures (20-50% v/v) and air.
  • Operated the Supercritical Water Oxidation reactor at constant pressure (approx. 24.3 MPa) and temperature (approx. 425 °C).
  • Employed orthogonal camera views (backlit shadowgraphy, color imaging) and UV-Visible spectroscopy.

Main Results:

  • Successfully achieved autoignition of ethanol hydrothermal flames.
  • Observed diffusion flames with both laminar and turbulent characteristics.
  • Correlated flame features with specific flow conditions.
  • Acquired spectroscopic data of flame emissions.

Conclusions:

  • Ethanol hydrothermal flames can be autoignited and stabilized in SCWO reactors.
  • Flame behavior is dependent on flow parameters.
  • Visual and spectroscopic data provide insights into flame dynamics and combustion processes.