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Han C.,Wuhan Kaidi Electrical Power Environmental Co. | Zhang Y.,Wuhan Kaidi Electrical Power Environmental Co. | Shang K.,Dalian University of Technology | Wu S.,Dalian University of Technology | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

The forced oxidation method is commonly used in wet FGD processes for oxidizing the sulfite product, but it holds some drawbacks including low oxidation rate, high energy cost, and high device investment, etc. In this study, surface discharge plasma was used to activate air to produce reactive oxygen species (ROS), and it replaced air as the oxidant for improving the oxidation efficiency of sulfite. The influencing factors of sulfite oxidation including the air flow rate in surface discharge reactor, discharge voltage, solution pH value, and solution temperature and the content of ammonium sulfate in solution were examined. It is found that the oxidation efficiency of ammonium sulfite increased with the air flow rate and the discharge voltage, while the pH and the solution temperature presented less effect on the oxidation efficiency of ammonium sulfite, and the content of ammonium sulfate had little effect on the enhanced performance of sulfite oxidation by ROS injection. Comparing with air forced oxidation, ROS injection can effectively reduce the oxidation time, and it has a big application potential in wet FGD. ©, 2015, Science Press. All right reserved. Source


Shang K.,Dalian University of Technology | Shi F.,Wuhan Kaidi Electrical Power Environmental Co. | Han C.,Wuhan Kaidi Electrical Power Environmental Co. | Li J.,Dalian University of Technology | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2015

To improve the oxidation efficiency of the sulfite product in wet ammonia flue gas desulfurization, we used reactive oxygen species (ROS) generated from gas-phase surface discharge instead of air to oxidize ammonium sulfite, and investigated how the variation of gas flow parameters, including air temperature, air humidity, pore diameter of bubbler, and the transport distance of oxidative species, influences the oxidation rate of ammonium sulfite. According to the experimental results, the oxidation efficiency of ammonia sulfite increases with air flow rate, but decreases with increasing air humidity and air temperature. It is mainly due to the reduction of ozone at higher air humidity and temperature. Increasing the diameter of bubbler' pores and the delivery distance of oxidative species reduces the utilization rate of oxidative species including ozone, which further reduces the oxidation efficiency of ammonium sulfite. Compared with air forced oxidation, the oxidation method using ROS produced by surface discharge can raise the oxidation efficiency of ammonium sulfite by over one time. ©, 2015, Science Press. All right reserved. Source


Zhao H.,Wuhan Kaidi Electrical Power Environmental Co. | Yan X.A.,Wuhan Kaidi Electrical Power Environmental Co. | Wu S.,Dalian University of Technology | Shang K.F.,Dalian University of Technology | Li J.,Dalian University of Technology
Advanced Materials Research | Year: 2014

Surface discharge plasma was used to activate air to produce reactive oxygen species (ROS) for promoting the oxidation of ammonium sulfite by air forced oxidation method. The effect of applied voltage and the air speed in discharge reactor on the generation of ozone as well as the oxidation kinetic of ammonium sulfite were analyzed and discussed. The ozone concentration increased with the discharge voltage, but decreased with the air speed, and a maximum mass of generated ozone was obtained at air speed of 15 m/s. Compared with air forced oxidation, the oxidation kinetic constant of ammonium sulfite by ROS injection had an increase by 2.67-fold, and the oxidation of ammonium sulfite followed a pseudo zero order kinetics. An increase in air speed accelerated the oxidation of ammonium sulfite, and the oxidation kinetic constant of ammonium sulfite was increased by 5-fold when the air speed increased by 2-fold. © (2014) Trans Tech Publications, Switzerland. Source

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