scholarly journals The behavior and modelling of the vibrational-to-translational temperature ratio at long time scales in CO2 vibrational kinetics

2019 ◽  
Vol 4 (12) ◽  
pp. 2108-2116 ◽  
Author(s):  
Sergio H. Moreno ◽  
Andrzej I. Stankiewicz ◽  
Georgios D. Stefanidis
Keyword(s):  
Reaction Kinetics ◽  
Time Scales ◽  
Thermal Plasma ◽  
Kinetics Study ◽  
Temperature Ratio ◽  
Translational Temperature ◽  
Long Time ◽  
Vibrational Kinetics ◽  
Non Thermal Plasma

Reaction kinetics study of the vibrational-to-translational temperature ratio of CO2, a crucial variable to achieve an energetically efficient dissociation in non-thermal plasma.

Kinetics study on non-thermal plasma mineralization of adsorbed toluene over γ-Al2O3 hybrid with zeolite

2019 ◽  
Vol 369 ◽  
pp. 430-438 ◽  
Author(s):  
Caihong Qin ◽  
Hui Guo ◽  
Wenwen Bai ◽  
Jiayu Huang ◽  
Xuemin Huang ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Kinetics Study ◽  
Non Thermal Plasma

scholarly journals Investigation of Non-Thermal Plasma Assisted Charcoal Gasification for Production of Hydrogen-Rich Syngas

2019 ◽  
Author(s):  
Yin Pang ◽  
Thomas Hammer ◽  
Dominik Mueller ◽  
Juergen Karl
Keyword(s):  
Reaction Kinetics ◽  
Thermal Plasma ◽  
Steam Gasification ◽  
Hydrogen Release ◽  
Rate Coefficients ◽  
Specific Enthalpy ◽  
Drop Tube ◽  
Carbon Conversion ◽  
Production Of Hydrogen ◽  
Non Thermal Plasma

The motivation of this work is to investigate experimentally the influence of non-thermal plasma (NTP) application on the reaction kinetics of atmospheric pressure steam gasification of charcoal using a thermostatically controlled drop tube reactor. A gliding-arc generator provides about 1 kW electrical power NTP. For comparison thermal gasification is investigated under comparable flow and specific energy input conditions providing additional heat to the steam. Optical temperature measurement 20 cm flow down of the NTP zone is utilized to characterize the specific enthalpy of the reactive flow. The composition of produced syngas is measured by a gas analyzer and used for the calculation of gas flow rates. The results show a NTP-enhancement on the production of individual syngas components (H2, CO, CH4), especially on hydrogen production by around 39%. The syngas-based carbon conversion and hydrogen release are calculated from the carbon and hydrogen balance between the correspondent content in syngas and in the feedstock. The NTP promoted the carbon conversion and hydrogen release by 25% and 31%, respectively. The first-order reaction kinetics are determined by data-fitting in an Arrhenius diagram. The plasma enhanced the reaction rate coefficients by 27%. Based on experimental results and other literature, possible plasma-induced reactions are proposed.

scholarly journals Plasma-Assisted Biomass Gasification in a Drop Tube Reactor at Atmospheric Pressure

2018 ◽  
Author(s):  
Yin Pang ◽  
Leo Bahr ◽  
Peter Fendt ◽  
Lars Zigan ◽  
Stefan Will ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Thermal Plasma ◽  
Atmospheric Pressure ◽  
Drop Tube ◽  
Carbon Conversion ◽  
Gas Temperature ◽  
Gasification Process ◽  
Operation Conditions ◽  
Tube Reactor ◽  
Non Thermal Plasma

Compared to conventional allothermal gasification of solid fuels (e.g. biomass, charcoal, lignite etc.), plasma-assisted gasification offers an efficient method to apply energy into the gasification process to increase the flexibility of operation conditions and to increase the reaction kinetics. In particular, non-thermal plasmas (NTP) are promising, in which thermal equilibrium is not reached and electrons have substantially higher mean energy than gas molecules. Thus it is generally assumed that in NTP the supplied energy is utilized more efficiently for generating free radicals initiating gasification reactions than thermal plasma processes. In order to investigate this hypothesis, we compared purely thermal to non-thermal plasma assisted gasification of biomass in steam in a drop tube reactor at atmospheric pressure. The NTP was provided by means of gliding arcs between two electrodes aligned in the inlet steam flow. Electric power of about 1 kW was supplied using a high voltage generator operating at frequencies between 70 and 150 kHz and voltage amplitudes up to 10 kV. A laser-assisted optical method (Raman spectroscopy) was applied for measuring the gas temperature both in the conventionally heated steam and flow-down of the visible plasma filaments of the gliding arcs. Reaction yields and rates were evaluated using these measured gas temperatures. The first experimental results have shown that the non-thermal plasma not only promotes the carbon conversion of the fuel particles, but also accelerates the reaction kinetics. The carbon conversion is increased by nearly 10% using wood powder as the fuel. With charcoal powder more than 3% are converted into syngas.

SYNTHESIS AND REACTION KINETICS STUDY OF TRI PHENYL PHOSPHITE

2019 ◽  
Vol 2 (2) ◽  
pp. 99-106
Author(s):  
Satish M. Mane ◽  
M. Praharaj Bhatnagar ◽  
M. R. Sawant ◽  
B. N. Thorat
Keyword(s):  
Reaction Kinetics ◽  
Kinetics Study

The Spread of Pollutants from Harbour Sludge Depots

1984 ◽  
Vol 16 (3-4) ◽  
pp. 623-633
Author(s):  
M Loxham ◽  
F Weststrate
Keyword(s):  
Time Scales ◽  
Molecular Diffusion ◽  
Near Field ◽  
Parameter Analysis ◽  
Migration Patterns ◽  
Long Time ◽  
Dilution Effects ◽  
Short Time ◽  
Harbour Sludge

It is generally agreed that both the landfill option, or the civil techniques option for the final disposal of contaminated harbour sludge involves the isolation of the sludge from the environment. For short time scales, engineered barriers such as a bentonite screen, plastic sheets, pumping strategies etc. can be used. However for long time scales the effectiveness of such measures cannot be counted upon. It is thus necessary to be able to predict the long term environmenttal spread of contaminants from a mature landfill. A model is presented that considers diffusion and adsorption in the landfill site and convection and adsorption in the underlaying aquifer. From a parameter analysis starting form practical values it is shown that the adsorption behaviour and the molecular diffusion coefficient of the sludge, are the key parameters involved in the near field. The dilution effects of the far field migration patterns are also illustrated.

Use of non-thermal plasma in lignocellulosic materials: A smart alternative

2021 ◽  
Vol 109 ◽  
pp. 365-373
Author(s):  
Gabriela N. Pereira ◽  
Karina Cesca ◽  
Anelise Leal Vieira Cubas ◽  
Débora de Oliveira
Keyword(s):  
Thermal Plasma ◽  
Lignocellulosic Materials ◽  
Non Thermal Plasma

Non-thermal pulsed plasma activated water: environmentally friendly way for efficient surface modification of semiconductor nanoparticles

2021 ◽  
Author(s):  
Pavel Galář ◽  
Josef Khun ◽  
Anna Fučíková ◽  
Kateřina Dohnalová ◽  
Tomáš Popelář ◽  
...  
Keyword(s):  
Surface Modification ◽  
Free Surface ◽  
Thermal Plasma ◽  
Environmentally Friendly ◽  
Semiconductor Nanoparticles ◽  
Reactive Species ◽  
Pulsed Plasma ◽  
Non Thermal Plasma ◽  
Plasma Activated Water

Non-thermal plasma activated water can be used for cheap, easy and chemicals-free surface modification of nanoparticles, with all the reactive species originating solely in air and water.

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