scholarly journals Water Plasma Generation Under Atmospheric Pressure for Waste Treatment

2005 ◽  
Vol 5 (1) ◽  
pp. 30 ◽  
Author(s):  
Takayuki Watanabe
Keyword(s):  
Waste Treatment ◽  
Cooling Water ◽  
High Energy ◽  
Steam Generators ◽  
Plasma System ◽  
Plasma Generation ◽  
Halogenated Hydrocarbon ◽  
High Durability ◽  
Plasma Characteristics ◽  
Steam Plasma

DC lOO%-steam plasma characteristics were investigated for the application of halogenated hydrocarbon decomposition because steam plasmas are chemically reactive. However, plasma system generally requires complex subsystems such as steam generators and cooling units. The presented steam plasma system is a portable light-weight plasma generation system that does not require any gas supply unit. The system has high-energy efficiency because it does not need additional cooling water. Electrodes of high durability are required for a DC lOO%-steam plasma because the electrodes are exposed to reactive conditions. Thus, the electrode's characteristics were also investigated under different configurations and conditions. Keywords: CFC decomposition, halon decomposition, steam plasma, thermal plasma, and waste treatment.

Magnetic spectrometry of high energy deuteron beams from pulsed plasma system

2010 ◽  
Vol 52 (8) ◽  
pp. 085007 ◽  
Author(s):  
M V Roshan ◽  
S V Springham ◽  
A Talebitaher ◽  
R S Rawat ◽  
P Lee
Keyword(s):  
High Energy ◽  
Pulsed Plasma ◽  
Plasma System

scholarly journals Optimization Design and Analysis of Single-Stage Mixed Refrigerant Liquefaction Process

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiao Wu ◽  
Zhaoting Wang ◽  
Xiaodong Dai ◽  
Quan Ge ◽  
Fei Liu
Keyword(s):  
Natural Gas ◽  
Power Consumption ◽  
Optimization Design ◽  
Cooling Water ◽  
High Energy ◽  
Exergy Loss ◽  
Total Power ◽  
Small Scale ◽  
Water Load ◽  
Total Power Consumption

Small-scale natural gas liquefaction processes have several clear advantages, particularly in the exploitation of ‘unconventional’ natural gas (NG) from sources such as difficult-to-access and offshore gas fields. Moreover, conventional liquefaction processes have a number of disadvantages such as high energy consumption, large cooling loads required in the refrigeration cycle, and non-uniform matching of cold and hot flows in liquified natural gas (LNG) heat exchanger (HE). The main objective of this study was to optimize the most commonly used mixed refrigerant process. The liquefaction performance of the optimized process was analyzed and the influence of gas parameters on the power consumption, exergy loss, freezing mixture circulation, and cooling water load were investigated. The results show that compressor power consumption can be reduced by 29.8%, the cooling water load can be reduced by 21.3%, and the system exergy efficiency can be increased by 41% with the optimized process. Furthermore, throttling and compression of the freezing mixture were increased during the refrigeration stage. It can be concluded that reducing the feed gas temperature and increasing the feed gas pressure can reduce the total power consumption, exergy loss, freezing mixture circulation, and cooling water load, which can significantly improve liquefaction performance.

scholarly journals Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

2017 ◽  
Vol 9 (4) ◽  
pp. 62 ◽  
Author(s):  
Shoichi Katsuta ◽  
Naoki Kanaya ◽  
Kotaro Bessho ◽  
Hideaki Monjushiro
Keyword(s):  
Metal Oxide ◽  
Ph Dependence ◽  
Metal Oxide Nanoparticles ◽  
Cooling Water ◽  
High Energy ◽  
Adsorption Behavior ◽  
Oxide Surface ◽  
Oxide Nanoparticles ◽  
Hydroxyl Groups ◽  
Radioactive Trace

Radioactive trace 7Be produced in cooling water systems for high-energy accelerators is known to be captured by metal-oxide colloidal nanoparticles generated through corrosion of metal components in water. This study is aimed at investigating the adsorption behavior of trace Be2+ onto various oxide nanoparticles (Al2O3, SiO2, TiO2, Fe2O3, CoO, and CuO) dispersed in water at 25 °C in order to clarify the tendency and features of the interaction of Be2+ with metal oxides. From pH dependence of the distribution ratio of Be2+ between the nanoparticle phase and the aqueous solution phase, the surface complexation constants (βs,n) have been determined for the reaction of Be2+ with the hydroxyl groups on the oxide surface (>S−OH), i.e., Be2+ + n >S−OH ⇄ (>S−O)nBe(2−n)+ + n H+. The n values are generally 1 and 2 and the sequences of the βs,n values are Fe2O3 > TiO2 » Al2O3 > SiO2 for βs,1 and Fe2O3 > TiO2 > SiO2 > Al2O3 >> CoO » CuO for βs,2. The dependences of the the βs,n values on the kind of oxide are explained based on the electronegativity of the metal (or Si) composing the oxide.

Effect of antenna capacitance on the plasma characteristics of an internal linear inductively coupled plasma system

2008 ◽  
Vol 15 (8) ◽  
pp. 083501 ◽  
Author(s):  
Jong Hyeuk Lim ◽  
Kyong Nam Kim ◽  
Jung Kyun Park ◽  
Geun Young Yeom
Keyword(s):  
Inductively Coupled Plasma ◽  
Plasma System ◽  
Inductively Coupled ◽  
Plasma Characteristics

Ar torch plasma characteristics and its application to waste treatment

1998 ◽  
Vol 316 (1-2) ◽  
pp. 111-116 ◽  
Author(s):  
Tsuginori Inaba ◽  
Yoshimoto Watanabe ◽  
Masayoshi Nagano ◽  
Takayuki Ishida ◽  
Masao Endo
Keyword(s):  
Waste Treatment ◽  
Plasma Characteristics

Recycled Material for Sensible Heat Based Thermal Energy Storage to be Used in Concentrated Solar Thermal Power Plants

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Xavier Py ◽  
Nicolas Calvet ◽  
Régis Olives ◽  
Antoine Meffre ◽  
Patrick Echegut ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Industrial Development ◽  
Power Plants ◽  
Waste Treatment ◽  
Thermal Power ◽  
High Energy ◽  
High Concentration ◽  
Investment Cost

Current technologies of concentrated solar power plants (CSP) are under extensive industrial development but still suffer from lack of adapted thermal energy storage (TES) materials and systems. In the case of extended storage (some hours), thousands of tonnes of materials are concerned leading to high investment cost, high energy and GHG contents and major conflicts of use. In this paper, recycled industrial ceramics made by vitrification of asbestos containing wastes (ACW) are studied as candidates to be used as sensible TES material. The material presents no hazard, no environmental impact, good thermophysical properties (λ= 1.4 W m−1 K−1; Cp = 1025 J kg−1 K−1; ρ= 3100 kg m−3) and at very low investment cost. Thanks to the vitrification process of the wastes, the obtained ceramics is very stable up to 1200 °C and can be directly manufactured with the desired shape. The vitrified ACW can be used as TES material for all kinds of the CSP processes (from medium up to high concentration levels) with properties in the same range than other available materials but with lower cost and without conflict of use. The proposed approach leads also to sustainable TES allowing a pay back of the energy needed for the initial waste treatment. Furthermore, this new use of the matter can enhance the waste treatment industry instead of land fill disposal.

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