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Title: Numerical simulations of the temperature and velocity fields in a plasma-arc system and equilibrium calculations of steam injected for syngas recovery from POPs
Author: Wang Y(王阳); Tian JG(田君国); Li YJ(李要建); Wang R(王蕊); Xu YX(徐永香); Sheng HZ(盛宏至)
Issued Date: 2009
Conference Name: Joint Conference: International Thermal Treatment Technologies (IT3) and Hazardous Waste Combustors (HWC)
Conference Date: May 18, 2009 - May 21, 2009
Conference Place: Cincinnati, OH, United states
Abstract: A direct current (DC) experimental facility of 30 kW with plasma-arc technology was set up to study the pyrolysis process in the laboratory. The temperature and velocity fields make a great impact on the transfer and reaction among the molecules, and so determining the destruction efficiency. It's difficult to directly measure the temperature of the arc region, therefore numerical simulation becomes a substitute method. According to the dimension of this facility, a magnetohydrodynamic model is used to simulate the temperature and velocity fields. The section drawings clearly exhibit the phenomenon of cathode jet and cathode spot. Furthermore, the treatment of Persistent Organic Pollutants (POPs) agents in a steam-plasma system for syngas recovery has been simulated. Based on the principle of Gibbs free energy minimum, the equilibrium product distribution versus steam content and temperature is calculated. Amount of syngas increases with the increase of temperature, the process acts as energy transformation - electrical energy is finally restored in the syngas. At the ideal temperature of POPs treatment, the energy recovered (Qre) and the energy input (Qin) both increase with the increase of steam content, but Qin subtracted from Qre gets to maximum while the molar ratio of oxygen to carbon (O/C) is near 1. The results show that the plasma-arc technology is an environmentally friendly and economically feasible for the disposal of POPs.
Keyword: Arc ; Cathode jet ; Cathode spot ; Destruction efficiency ; Direct current ; Electrical energy ; Energy inputs ; Energy transformation ; Environmentally-friendly ; Equilibrium calculation ; Experimental facilities ; Magnetohydrodynamic model ; Magnetohydrodynamic plasmas ; Molar ratio ; Numerical simulation ; Persistent organic pollutants ; Plasma systems ; Product distributions ; Pyrolysis process ; Steam content ; Syn-gas ; Velocity field
Indexed Type: EI
Corresponding Author: Sheng, H. (hz_sheng@imech.ac.cn)
Source: Joint Conference: International Thermal Treatment Technologies (IT3) and Hazardous Waste Combustors (HWC)
Language: 英语
ISBN: 9781615671830
Content Type: 会议论文
URI: http://dspace.imech.ac.cn/handle/311007/60470
Appears in Collections:等离子体与燃烧中心(2009-2011)_会议论文

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