| Fine particles, whose sizes range from0.1μm to1μm are very hard to capture in the Electrostatic precipitators. Due to their poor migration velocities. However, fine particles are very dangerous because they can cause bad weathers, catalyze contaminants, and do great harm to human health. It is urgent to find a efficient way to eliminate fine particles from flue gases.ESPs have been one of the most popular techniques used to remove particulate matters. They are now being noticed because recent researches show that ionic winds greatly disrupt flow fields in the ESPs, and hinder fine particles from travelling to collecting electrodes. Thus lower the performance of ESPs.If the ionic winds in ESPs could be controlled and utilized, it would greatly improve the collection efficiency of the ESPs. For this purpose, PIV measurements were carried out to reveal the nature of the ionic wind. These measurements are designed to get high resolution data, which would be more accurate than reported worksResults show that in an ESP, ionic wind can be generated under very low voltage, as long as there is a corona discharge. And ionic wind accelerate and finally disperse in a very short distance. But it would influence external flow and cause vortexes and turbulence. The speed of ionic wind is linearly positive to the square root of discharge current, or to the discharge voltage. And discharge power is the key factor determining the performance of ionic wind. |
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