| 摘要 |
PCT No. PCT/SE92/00815 Sec. 371 Date May 9, 1994 Sec. 102(e) Date May 9, 1994 PCT Filed Nov. 26, 1991 PCT Pub. No. WO93/10902 PCT Pub. Date Jun. 10, 1993.The present invention relates to a method for controlling, in an electrostatic precipitator unit comprising discharge electrodes and collecting electrodes between which a varying high voltage is maintained, a pulsating direct current supplied to these electrodes. In the method according to the invention the frequency, pulse charge and/or pulse duration of the pulsating direct current are caused to vary such that a plurality of combinations of frequency, charge and duration are obtained. For each of these combinations, the voltage U between discharge electrodes and collecting electrodes is measured, and for each of these combinations, a voltage level Uref is determined, measured or calculated. In a defined time interval, for each of these combinations, either the integral Ik= INTEGRAL Ux(U-Uref).dt is measured and/or calculated during the time interval, or Ai=Ux(U-Uref) is measured at a number of points of time, whereupon Ik or linear combinations of Ai are used to select the combination of frequency, charge and duration of the pulsating direct current. |
