Experimental Study on Charge Amounts of Abnormal Discharges Occurred from Bipolar Electrostatic Ionizer

Choi Kwangseok, Choi Min, Osada Yuki, Suzuki Teruo

doi:10.18943/safety.61.2_133

<p>The incendivity of abnormal discharges occurring from a nozzle-type bipolar electrostatic ionizer was experimentally examined through the discharge amount using three methods（ i.e., EN type probe, IEC type probe, JNIOSH type probe）. Prior to the main experiments, a calibration test was performed with all the three methods, referred to as preliminary experiment. Then, for the main experiment, corona discharge needle of the ionizer was contacted with the discharge electrode （metal ball, 25 mm in dimeter） attached to each probe. As a result, the values obtained using the three methods were almost the same, and their reliability was confirmed in the calibration test. Among them, the JNIOSH method is the easiest and has the smallest error. It was also confirmed that all the charge amount obtained in this study did not exceed 30 nC （absolute value） which is a safe level and is the threshold for the risk assessment in the industry process using electrostatic ionizer. Therefore, it was suggested that the ionizer used in this experiment is extremely safe. However, when the generation of corona ions was suppressed from the discharge needle, the maximum value was 32.38 nC （absolute value）, which is not within the safe level. In order to not hinder the production of corona ions, regular maintenance is required.</p>

Experimental Study on Charge Amounts of Abnormal Discharges Occurred from Bipolar Electrostatic Ionizer

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