Kinetic features of non-thermal plasma conversion of propane-air mixture at high pressure

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Abstract

The paper presents the results of modeling the conversion of a lean non-combustible propane-air mixture with initiation by a high-frequency corona discharge at a pressure of 5 bar and an initial temperature of 300 K for different equivalence ratios. The discharge creates non-thermal plasma in filament channels. Experiments on the development of such a discharge in air for different conditions were carried out. At pressures of 1 and 2 bar, the discharge has a complex morphology with branching of discharge filaments. At pressures above 3 bar, the glow region has the shape of a straight spoke. The paper presents a kinetic analysis of the conversion. The key component for propane decomposition is the O atom produced in the discharge as a result of O2 dissociation by direct electron impact and excited N2 molecules. In the afterglow, after completion of discharge, the source of the O atom is the reactions of ozone decomposition with N2 and O2. For the formation of NO, it is necessary to take into account the production of N atoms in the excited and ground states. Intermediate oxidized hydrocarbons play a major role in increasing the concentrations of C3H6, C2H4, and CO over time. The decomposition of O3 occurs to a greater extent in a cycle involving NO3. The heating of the discharge-activated zone did not exceed 600 K. The composition of the conversion products obtained as a result of modeling was compared with known experimental literature data.

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About the authors

E. A. Filimonova

Joint Institute for High Temperatures, Russian Academy of Sciences

Author for correspondence.
Email: helfil@mail.ru
Russian Federation, Moscow

I. V. Selivonin

Joint Institute for High Temperatures, Russian Academy of Sciences

Email: helfil@mail.ru
Russian Federation, Moscow

I. A. Moralev

Joint Institute for High Temperatures, Russian Academy of Sciences

Email: helfil@mail.ru
Russian Federation, Moscow

A. S. Dobrovolskaya

Joint Institute for High Temperatures, Russian Academy of Sciences

Email: helfil@mail.ru
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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1. JATS XML
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2. Fig. 1. Schematic diagram of the setup: 1 – gas chamber, 2 – high-voltage input, 3 – electrode, 4 – optical chamber, 5 – measuring capacitor.

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3. Fig. 2. a – Oscillograms of the applied voltage and the charge transferred through the electrode system; b – graph of the energy deposition into the discharge. The data are presented for a pressure of 2 bar.

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4. Fig. 3. Discharge images at different pressures and a voltage amplitude of 15 kV: a – 1 bar (Etot = 82 mJ), b – 2 bar (Etot = 34 mJ), c – 3 bar (Etot = 28 mJ), d – 4 bar (Etot = 27 mJ); Etot is the total energy deposited per radio pulse. Chamber exposure is 1 ms.

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5. Fig. 4. Dependence of component concentrations on the discharge filament formation time at ϕ = 0.45; DeC3H8 – amount of consumed propane (difference between initial propane concentration and remaining after discharge treatment).

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6. Fig. 5. Evolution of the activated zone after discharge shutdown at ϕ = 0.45. The “legend” indicates the curve type at different points in time. This applies to both temperature curves (red) and mole fractions of propane (black).

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7. Fig. 6. Evolution of components after discharge completion in the activated zone at point r = 0.

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