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Simulation and Experiment of NO_x Removal Based on Discharge Barrier Discharge

Author: WangKeFeng
Tutor: DuBoXue
School: Tianjin University
Course: High Voltage and Insulation Technology
Keywords: Plasma Dielectric barrier discharge NO_x Energy consumption
CLC: X51
Type: Master's thesis
Year: 2009
Downloads: 22
Quote: 0
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Abstract


Emissions has now become the city 's first major sources of air pollution , restrictions and control vehicle exhaust emissions has become a very urgent task , but the inherent limitations of the traditional gas treatment method can no longer meet the requirements of increasingly stringent emissions regulations , especially for nitrogen oxides (NO_x) most toxic effects and because the most difficult to deal with ineffective . The dielectric barrier Discharge Plasma technology to combine technical perfection of the gas discharge and high voltage , with good effect , a wide range and can handle a variety of contaminants and clean thoroughly advantages become the hotspot of research in recent years in the field of motor vehicle exhaust purification . Dielectric barrier discharge NO_x removal research , has high academic value and practical value . For the most current studies are based on the current situation of the simulated gas , actual diesel engine exhaust NO_x study , the use of low temperature dielectric barrier discharge plasma technology , applied voltage amplitude and frequency of the power supply , the shape of the electrode , the plasma discharge region , as well as exhaust relative humidity affect the removal of NO_x a more systematic study . Experimental results : The results show that when the electrode is a coaxial cylindrical NO_x by the removal rate is increased with the voltage amplitude and the frequency increases , there exists a threshold value , while its power consumption is increased ; of NO_x by the removal rate with the diameter of the high voltage electrode and discharge the increase of the effective area increases ; NO_x removal rate is increased with decreasing the outer electrode radius of a maximum increase of relative humidity , with the exhaust gas and reduce ; when the electrode structure of a zigzag , sawtooth electrode structure on the NO_x the removal rate was less affected. Meanwhile, based on the dielectric barrier discharge works to establish the chemical kinetic model , computer simulation , in-depth study of low-temperature plasma technology to purify diesel exhaust NO_x reaction mechanism , and experiments and comparative analysis of simulation results .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control
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