| With the development of the global motor vehicle dieselization trend,the effective and controllable emission of diesel vehicle exhaust is put on the agenda.Oil quality improvement and the performance optimization technology of the internal device reduce the exhaust soot emission to a certain extent,but its cost is high and the improved performance is limited.Therefore,it is necessary to cooperate with the external purification post-treatment technology.At present,diesel particulate filter(DPF)and oxidative catalytic converters(DOC)are widely used in diesel vehicle exhaust mainstream post-processing devices.Although they slow down the exhaust emissions to a certain extent,but there is easy to block the filter cartridge,DPF regeneration difficulties.The DBD Non-temperature plasma discharge is stable and uniform,which can effectively collide with the molecular particles in the diesel vehicle exhaust,and Efficient Purification of Diesel Exhaust by Dielectric Barrier Discharge Non-temperature Plasma.The purification of soot particles in diesel vehicle exhaust by coaxial cylindrical dielectric barrier discharge Non-temperature plasma was studied.The results are as follows:With the increase of discharge voltage in 13 k V～17 k V,the soot purification rate,discharge power,and energy density increase.With the increase of soot concentration in the range of 33.75 mg/m~3～99.4 mg/m~3,the purification rate of the particulate matter showed a downward trend,and the purification performance of the reactor decreased sharply in the later stage.When the exhaust gas flow rate increases from 2 L/min to 5L/min,the electron deflection,and blow-off effect increase,resulting in the increase of the reactor corona voltage and the decrease in the purification rate.The orthogonal experimental analysis shows that the primary and secondary order of influencing factors is:gas flow>discharge voltage>gas concentration.The discharge voltage of 17 k V,the gas flow of 3 L/min,and the initial concentration of 50.1 mg/m~3are selected as the optimal conditions.The energy utilization rate is 0.0594 mg/k J,the energy density SIE=324 J/L,and the soot purification efficiency reaches52.7%.A suitable response surface model was established,and the applicability of the model and the regression equation was verified by variance residual analysis.There was an interaction between the three factors.With the increase in discharge voltage,the decrease in concentration,and the decrease in inlet flow,there was an increase in the response surface of both,which promoted the purification of soot particles.In this paper,a coaxial cylindrical dielectric barrier discharge of Non-temperature plasma combined with a catalyst one-stage reactor was used to purify the hydrocarbons in the exhaust gas of diesel vehicles.The effects of three factors on the purification of hydrocarbons in exhaust gas under different filling amounts were studied.The results are as follows:With the increase of discharge voltage,the purification rate of hydrocarbons under different catalyst filling amounts is improved.The addition of a catalyst effectively improves the purification effect compared with DBD discharge alone.In the range of 5mg/L～210 mg/L,the THC of different filling amounts showed a downward trend,and the increase of catalyst filling amount slowed down the influence of initial concentration on the purification rate of hydrocarbon.With the increase of exhaust gas flow,the purification rate of THC with different filling amounts decreased to different degrees,and the addition of catalyst significantly improved the purification effect.A three-factor three-level orthogonal experiment was carried out to remove hydrocarbon in a one-stage reactor filled with 400 g catalyst.The primary and secondary relationship between the three factors on THC was gas flow>discharge voltage>gas concentration.The discharge voltage is 17 k V,the gas flow rate is 3 L/min,and the initial concentration is 97 mg/L.The THC purification rate is 59.2%.Figure[43]Table[20]Reference[74]... |
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