Microwave Torch Plasmas for Decomposition of Gaseous Pollutants

2004 ◽  
Vol 7 (1) ◽  
Author(s):  
Mariusz Jasiński ◽  
Jerzy Mizeraczyk ◽  
Zenon Zakrzewski
Keyword(s):  
Atmospheric Pressure ◽  
Energy Cost ◽  
Gas Flow ◽  
Coaxial Line ◽  
Low Energy ◽  
Gaseous Pollutants ◽  
Gas Flow Rate ◽  
Torch Discharge ◽  
Volatile Organic ◽  
Moderate Power

AbstractResults of the study of decomposition of volatile organic compounds (VOCs including Freons) in their mixtures with either synthetic air or nitrogen, and nitrogen oxides NOx in their mixtures with N2 or Ar in low (~ 100 W) and moderate-power (200-400 W) microwave torch plasmas at atmospheric pressure are presented. Three types of microwave torch discharge (MTD) generators, i.e. the low-power coaxial-line-based MID, the moderate-power waveguide-based coaxial-line MTD and the moderate-power waveguide-based MTD generators were used. The gas flow rate and microwave power (2.45 GHz) delivered to the discharge were in the range of 1÷3 l/min and 100÷ 400 W, respectively. Concentrations of the processed gaseous pollutants usually were from several up to several tens percent. The energy efficiency of decomposition of several gaseous pollutants reached 1000 g/kWh. It was found that the microwave torch plasmas fully decomposed the pollutants at relatively low energy cost. This suggests that the MTD plasma can be a useful tool for decomposition of highly-concentrated gaseous pollutants.

Decomposition of Toluene with Plasma-catalysis: A Review

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Arne M. Vandenbroucke ◽  
Rino Morent ◽  
Nathalie De Geyter ◽  
Christophe Leys
Keyword(s):  
Energy Efficiency ◽  
Organic Compounds ◽  
Atmospheric Pressure ◽  
Low Energy ◽  
Gaseous Pollutants ◽  
Plasma Catalysis ◽  
Harmful Emission ◽  
Volatile Organic ◽  
Non Thermal Plasma ◽  
Mineralization Degree

AbstractNon-thermal plasma (NTP) generated at atmospheric pressure has been widely applied to abate the harmful emission of gaseous pollutants such as volatile organic compounds (VOCs). These studies have proven the existence of some drawbacks that hinder commercialization, such as a low energy efficiency and mineralization degree with the formation of undesired byproducts as a consequence. Recently, NTP has successfully been combined with catalysis in an attempt to solve these issues through complex interacting mechanisms. Toluene can be regarded as being the most frequent studied VOC for removal with plasma-catalysis on laboratory scale. Therefore, this paper aims at reviewing the current research on this model VOC.

Facile growth of centimeter-sized single-crystal graphene on copper foil at atmospheric pressure

2015 ◽  
Vol 3 (15) ◽  
pp. 3530-3535 ◽  
Author(s):  
Jing Li ◽  
Xuan-Yun Wang ◽  
Xing-Rui Liu ◽  
Zhi Jin ◽  
Dong Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Copper Foil ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Single Crystalline ◽  
Slowing Down ◽  
Cu Foil

By mildly oxidizing Cu foil and slowing down the gas flow rate, centimeter-sized single-crystalline graphene was grown on Cu at atmospheric pressure.

scholarly journals Computational Fluid Dynamics (CFD) Simulations and Experimental Measurements in an Inductively-Coupled Plasma Generator Operating at Atmospheric Pressure: Performance Analysis and Parametric Study

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 133 ◽  
Author(s):  
Sangeeta Punjabi ◽  
Dilip Barve ◽  
Narendra Joshi ◽  
Asoka Das ◽  
Dushyant Kothari ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Atmospheric Pressure ◽  
Inductively Coupled Plasma ◽  
Gas Flow ◽  
Rf Power ◽  
Gas Flow Rate ◽  
Inductively Coupled ◽  
Plasma Resistance ◽  
Computational Fluid Dynamics Cfd ◽  
Icp Torch

In this article, electrical characteristics of a high-power inductively-coupled plasma (ICP) torch operating at 3 MHz are determined by direct measurement of radio-frequency (RF) current and voltage together with energy balance in the system. The variation of impedance with two parameters, namely the input power and the sheath gas flow rate for a 50 kW ICP is studied. The ICP torch system is operated at near atmospheric pressure with argon as plasma gas. It is observed that the plasma resistance increases with an increase in the RF-power. Further, the torch inductance decreases with an increase in the RF-power. In addition, plasma resistance and torch inductance decrease with an increase in the sheath gas flow rate. The oscillator efficiency of the ICP system ranges from 40% to 80% with the variation of the Direct current (DC) powers. ICP has also been numerically simulated using Computational Fluid Dynamics (CFD) to predict the impedance profile. A good agreement was found between the CFD predictions and the impedance experimental data published in the literature.

scholarly journals KLa Determination Using the Effectiveness-NTU Method: Application to Countercurrent Absorbers in Operation Using Viscous Solvents for VOCs Mass Transfer

2019 ◽  
Vol 3 (2) ◽  
pp. 57
Author(s):  
Éric Dumont
Keyword(s):  
Mass Transfer ◽  
Flow Rate ◽  
Gas Flow ◽  
Liquid Flow Rate ◽  
Gas Flow Rate ◽  
Heat Exchanger Design ◽  
Volatile Organic ◽  
Overall Mass Transfer Coefficient ◽  
Viscous Solvents

In this study, the Effectiveness-NTU method, which is usually applied to heat exchanger design, was adapted to gas–liquid countercurrent absorbers to determine the overall mass transfer coefficient, KLa, of the apparatus in operation. It was demonstrated that the ε-NTU method could be used to determine the KLa using the Henry coefficient of the solute to be transferred (HVOC), the gas flow-rate (QG), the liquid flow-rate (QL), the scrubber volume (V), and the effectiveness of the absorber (ε). These measures are calculated from the gaseous concentrations of the solute measured at the absorber inlet (CGin) and outlet (CGout), respectively. The ε-NTU method was validated from literature dedicated to the absorption of volatile organic compounds (VOCs) by heavy solvents. Therefore, this method could be a simple, robust, and reliable tool for the KLa determination of gas–liquid contactors in operation, despite the type of liquid used, i.e., water or viscous solvents.

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