Experimental investigation of gas heating and dissociation in a microwave plasma torch at atmospheric pressure

Liu, Su; Kumar, Rajneesh; Ogungbesan, Babajide; Sassi, Mohamed

doi:10.1016/j.enconman.2013.12.001

Cited by 23 publications

(25 citation statements)

References 54 publications

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“…A previous study from the authors showed that the temperature in H2O and CO2 plasmas ranged from approximatively 6,000°C where the plasma is generated to 2,300°C 14 cm downstream of the plasma plume [36]. Similar temperatures are expected in air plasma [37]. Moreover, it was demonstrated that the temperature in the centre of the plasma was not significantly influenced by the applied microwave power [36].…”

Section: Radial Temperature Gradientsmentioning

confidence: 56%

Experimental investigation of the temperature distribution in a microwave-induced plasma reactor

Vecten

Wilkinson

Bimbo

et al. 2021

Fuel Processing Technology

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It is urgent to reduce CO2 emissions to mitigate the impacts of climate change. The development of advanced conversion technologies integrated with plasma torches provides a path for the optimisation of clean energy recovery from biomass and wastes, thus substituting fossil fuels utilization. This article presents the temperature characterisation within a laboratory-scale microwave-induced plasma reactor operated with air, H2O and CO2 as the plasma working gases. The benefits associated with the plasma torch are highlighted and include rapid responses of the plasma and the temperature profile within the reactor to changing operating conditions. The average temperature near the side wall in the laboratoryscale reactor is proportional to the applied microwave power, ranging from 550°C at 2 kW to 850°C at 5 kW, while significantly higher temperatures are locally present within the plasma plume. The described system demonstrates promising conditions that are ideal for effective energy recovery from biomass and wastes into clean fuel gas.

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Section: Radial Temperature Gradientsmentioning

confidence: 56%

Experimental investigation of the temperature distribution in a microwave-induced plasma reactor

Vecten

Wilkinson

Bimbo

et al. 2021

Fuel Processing Technology

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“…In this equation, T g (=1208 K) was the plasma gas temperature, which was measured by a thermocouple, T 0 (=300 K) was the room temperature. Su et al [18] calculated also molecular average velocity of air-nitrogen, air-argon, and air-air plasmas as 2 × 10 5 cm/s, 2 × 10 5 cm/s, and 2.1 × 10 5 cm/s, respectively, using…”

Section: Resultsmentioning

confidence: 99%

“…The gas flow velocity was calculated as 212 cm/s according to the gas flow rate (10 L/min) and the diameter of the tube (1 cm). The gas flow velocity for higher plasma gas temperature was estimated as 848 cm/s by using v hot = (T g /T 0 )v cold relation [18]. In this equation, T g (=1208 K) was the plasma gas temperature, which was measured by a thermocouple, T 0 (=300 K) was the room temperature.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric Pressure 2.45-GHz Microwave Helium Plasma

Güleç

Bozduman²,

Hala

2015

IEEE Trans. Plasma Sci.

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A waveguide-based microwave plasma system was built using a resonant cavity and a quartz tube. 2.45 GHz 850 W magnetron was used to obtain helium discharge without an igniter. The temporal images of discharge were recorded on microsecond time scales using an intensified charge-coupled device camera. The excitation temperature was calculated as 3385 K using the helium lines, which were obtained from emission spectrum of the discharge. The gas temperature was measured as 1208 K by a thermocouple.

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“…This can correspond to the observed effect, detected in the research. 14 Nevertheless, the increase in MW power leads to the growth of electron density (Figure 6_.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Numeric Model for Assessment of Naphthalene Conversion through Ionization Reactions in a Microwave Air Plasma Torch

Pilatau

Medeiros²,

Sobrinho

et al. 2016

Energy Fuels

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In this study, the authors have presented a numeric model (NM) for application to naphthalene (C10H8) conversion via ionization reaction in a microwave air plasma torch. The NM has included a pressure-independent enhanced electron energy distribution function (EEDF) and cross-section calculation, enhanced by a new formula of phase shift determination. Based on the validated NM, electron density n e and O 2 +, O –, C 10 H 8, N 2, and O 2 particles densities were calculated, as well as the conversion rate of C10H8 molecules was predicted. The predicted results showed that the ionization impact on C10H8 molecules conversion has not exceeded 0.81 × 10–10%. Based on the calculated collision cross-section of each species (O2, N2, and C10H8) of carrier gas, the authors suggested using cubic polynomial approximations of the cross-section curves with R-Square (COD) parameter R 2 = 99%. MW power increasing in the range 1.75–20 kW has raised the electron density in the range (0.5–4.5) × 1012 m–3. The maximal effect of electron density decreasing with pressure increasing was simulated at values of MW power greater than 7.5 kW. Herewith, pressure increasing and MW power increasing have not had any significant effect on the average electron energy.

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Experimental investigation of gas heating and dissociation in a microwave plasma torch at atmospheric pressure

Cited by 23 publications

References 54 publications

Experimental investigation of the temperature distribution in a microwave-induced plasma reactor

Experimental investigation of the temperature distribution in a microwave-induced plasma reactor

Atmospheric Pressure 2.45-GHz Microwave Helium Plasma

Numeric Model for Assessment of Naphthalene Conversion through Ionization Reactions in a Microwave Air Plasma Torch

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