Wuhan Kaidi Electrical Power Environmental Co.

Wuhan, China

Wuhan Kaidi Electrical Power Environmental Co.

Wuhan, China
SEARCH FILTERS
Time filter
Source Type

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.


Xia Y.,Dalian University of Technology | Yao X.,Dalian University of Technology | Zhang Y.,Wuhan Kaidi Electrical Power Environmental Co. | Shang K.,Dalian University of Technology | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2016

In order to investigate the oxidation effect of ozone produced by plasma activated air on calcium sulfite in desulfurization slurry, using a surface discharge plasma generator, we experimentally measured the influences of several factors, including discharge voltage, aeration quantity, aeration gas temperature, calcium sulfite slurry concentration, and calcium sulfite slurry temperature. The results show that, for calcium sulfite slurry concentration of 0.01 mol/L at room temperature, the oxidation was effective when the treatment conditions were at discharge voltage of 15 kV and aeration quantity of 1.0 m3/h. It is concluded that the lower aeration gas temperature, lower calcium sulfite slurry concentration, and higher calcium sulfite slurry temperature are favorable for the oxidation. When the discharge voltage is 14 kV and the calcium sulfite slurry concentration is 0.01 mol/L, the oxidation rate with 0.7 m3/h aeration quantity is 1.49~1.59 times as much as that with aeration quantity of 1.4 m3/h. When the calcium sulfite slurry concentration is the double of that of the air oxidation experiment, the oxidation rate of discharge oxidation is 1.2~1.5 times as much as that of air oxidation. Moreover, discharge oxidation possesses obvious advantages in technology investment and operation cost of process. © 2016, High Voltage Engineering Editorial Department of CEPRI. All right reserved.


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.


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.

Loading Wuhan Kaidi Electrical Power Environmental Co. collaborators
Loading Wuhan Kaidi Electrical Power Environmental Co. collaborators