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Positive direct current (DC) is not used in electrostatic precipitators (ESPs) primarily because it can lead to the charging of particles in a way that promotes their re-entrainment into the gas stream after collection. Instead, negative DC is employed, as it effectively attracts positively charged particles to the negatively charged plates, enhancing particle capture efficiency. Additionally, using negative DC reduces the likelihood of back corona discharge, which can compromise the ESP's performance.

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5d ago

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