| 摘要 |
In order to mitigate the problem of back-corona discharge in electrostatic precipitators, method and apparatus are provided for energizing the precipitator electrodes with repeated bursts of high voltage electrical pulses, superimposed upon a direct current voltage level. Additionally, the voltage of the pulses in a single burst is increased from each pulse to the next pulse during the time period that the pulse burst is applied. The effect of the ramping of the pulse burst voltage is to increase the average electric field and ion density during the pulse burst. The result is substantially higher particle charging which leads to improved particle charging collection efficiency. Moreover, in addition to eliminating the back-corona discharge problem which particularly occurs in the collection of high resistivity dust particles, the present method and apparatus for precipitator energization achieves the same advantages as so-called board pulse powering precipitator methods, without, however, the concomitant circuit cost associated with high voltage and high power switching devices.
|
