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Title:
DETECTION OF REVERSE IONIZATION IN ELECTROSTATIC PRECIPITATOR
Document Type and Number:
Japanese Patent JPS5867360
Kind Code:
A
Abstract:

PURPOSE: To prevent the degradation in the dust precipitation efficiency of dust precipitating electrodes in an electrostatic precipitator by detecting the reverse ionization phenomena generated in the dust precipitating electrodes from the waveforms of secondary voltages and decreasing the applied voltage thereby removing the electric charge accumulated in dust layers.

CONSTITUTION: When the electric resistance of dust exceeds 1×1011Ω.cm on accumulation of the dust on dust preciptating plates during the operation of an electrostatic precipitator, reverse ionization phenomena take place, and the dust precipitating performance is considerably degraded. In this time the instantaneous value of the secondary current observed by the condenser function of the dust precipitator is the value wherein photoelectric current is superposed on the true corona discharge current. The peak voltage of the waveforms of said secondary voltage and the instantaneous value of the voltage thereafter are detected and are compared with the boundary voltage of the reverse ionization determined as a function of the peak voltage. According to the difference in the compared values, the presence or absence of the generation of the reverse ionization phenomena is detected. When the reverse ionization phenomenon arises, the applied voltage of the dust precipitator is decreased to remove the electric charge accumulated in the dust; thereafter the voltage is applied again to prevent the degradation in the dust precipitating performance.


Inventors:
TERAI HIROSHI
YAMAMOTO ICHIROU
KUJI MANABU
ISHII YUKINORI
Application Number:
JP16408781A
Publication Date:
April 21, 1983
Filing Date:
October 16, 1981
Export Citation:
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Assignee:
SUMITOMO HEAVY INDUSTRIES
International Classes:
B03C3/68; B03C3/74; (IPC1-7): B03C3/68; B03C3/74