Adaptive Control for NOx Removal in Non-Thermal Plasma Processing

2007 ◽  
Vol 4 (5) ◽  
pp. 556-562 ◽  
Author(s):  
Peter A. Gorry ◽  
J. Christopher Whitehead ◽  
Jinhui Wu
Keyword(s):  
Adaptive Control ◽  
Thermal Plasma ◽  
Plasma Processing ◽  
Nox Removal ◽  
Thermal Plasma Processing ◽  
Non Thermal Plasma

Dilute Trichloroethylene Decomposition in Air by Using Non-Thermal Plasma - Catalyst Effect

2003 ◽  
Vol 6 (1) ◽  
Author(s):  
Tetsuji Oda ◽  
Kei Yamaji
Keyword(s):  
Energy Efficiency ◽  
Thermal Plasma ◽  
Plasma Processing ◽  
Operating Conditions ◽  
Plasma Region ◽  
Enhancing Effect ◽  
Long Period ◽  
Thermal Plasma Processing ◽  
Non Thermal Plasma ◽  
Catalyst Effect

AbstractDilute trichloroethylene (TCE) decomposition by the non-thermal plasma processing is investigated concerning with the enhancement of the removal-energy efficiency by use of the catalyst. Tested catalysts are zeolite, titania, vanadium oxide and tungsten oxide, which are inserted into the plasma region as pellets of a few mm spheres or discs. As the zeolite adsorbs too much TCE during a long period, the enhancing effect on the removal energy efficiency by the zeolite is not yet clear, but other catalysts can surely reduce the necessary energy to decompose TCE. As there are still too many parameters affecting the removal performance, the best catalyst, as enhancing the plasma processing, and that operating conditions will be analyzed in future.

Non-Thermal Plasma Processing for VOCs Decomposition and NOx Removal in Flue Gas

1997 ◽  
Vol 2 (2) ◽  
Author(s):  
Tetsuji Oda ◽  
Tadashi Takahashi ◽  
Ryuichi Yamashita
Keyword(s):  
Flue Gas ◽  
Thermal Plasma ◽  
Power Efficiency ◽  
Plasma Processing ◽  
Pulse Excitation ◽  
Thermal Plasma Processing ◽  
Vocs Decomposition ◽  
Reactor Geometry ◽  
Reduction Of Nox ◽  
Non Thermal Plasma

AbstractDecomposition performance of non-thermal plasma for volatile organic compounds (VOCs) such as chlorofluorocarbon (CFC), chlorohydrocarbon and other typical organic materials, were studied experimentally. DeNOx process of the non-thermal plasma for the flue gas was also tested. Frequency dependence of plasma exciting voltage including pulse and AC, humidity effects (OH radical effects) on the plasma processing and reactor geometry effects were studied to understand the decomposition mechanism and optimize the power efficiency of the processing. 500 Hz or 1kHz excitation is found to be the upper limit to realize good decomposition efficiency of VOCs or good reduction of NOx. Higher frequency causes other loss by heating residual ions. Pulse excitation was much better than the AC excitation, especially at the high decomposition rate of the VOCs.

scholarly journals Chemical and Antimicrobial Effects of Air Non-Thermal Plasma Processing of Fresh Apple Juice with Focus on Safety Aspects

Foods ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 2055
Author(s):  
Barbora Tarabová ◽  
Francesco Tampieri ◽  
Elisabetta Maran ◽  
Ester Marotta ◽  
Andrea Ostrihoňová ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Apple Juice ◽  
Plasma Processing ◽  
Antimicrobial Effect ◽  
Ambient Air ◽  
Yeast Saccharomyces Cerevisiae ◽  
Thermal Plasma Processing ◽  
Physico Chemical ◽  
Application Potential ◽  
Non Thermal Plasma

Freshly squeezed apple juice was subjected to air non-thermal plasma treatment to investigate the capability of this processing method to inactivate microorganisms and to evaluate its safety when applied to liquid food products. Two different configurations of a transient spark discharge in ambient air were tested: an electrospray system with the juice flowing directly through the high voltage needle electrode, and a batch system, where the discharge was generated onto the surface of the juice. The key physico-chemical parameters of the juice, such as pH, conductivity, color, transmittance, and Brix degree, did not significantly change upon treatment. The concentration of nitrate ions formed by the plasma was safe, while that of nitrite ions and hydrogen peroxide was initially higher than the safety limits, but decreased within 24 h post treatment. The plasma effect on individual natural components of the juice, such as sugars, organic acids, and polyphenols, treated in water solutions led to their partial or substantial decomposition. However, when these compounds were plasma-treated altogether in the juice, they remained unaffected. The antimicrobial effect of the plasma processing was evaluated via the inoculation of model microorganisms. A stronger (6 log) decontamination was detected for bacteria Escherichia coli with respect to yeast Saccharomyces cerevisiae. Plasma processing led to a substantial extension of the juice shelf-life by up to 26 days if refrigerated, which represents a promising application potential in food technology.

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