What do electrostatic precipitators use to remove dust from collecting electrodes?

Electrostatic precipitators are devices designed to remove particulate matter from exhaust gases, and they achieve this by utilizing electric fields to charge dust particles, which are then collected on electrodes. Over time, the accumulated dust can form a layer on these electrodes, reducing the efficiency of the precipitator.

Rappers are specifically used to dislodge the collected dust from the collecting electrodes. They work by delivering mechanical vibrations or impacts, which help to loosen the dust and allow it to fall into a hopper or collection system for disposal. This process is essential to maintaining the operational effectiveness of an electrostatic precipitator, ensuring that it remains efficient in capturing particulate matter from flue gases.

Other options, while related to the process of dust removal or air handling, do not serve the same purpose in this context. Blowers are typically used to move air through the system, filters are designed to capture particulate matter by trapping it within the medium, and scrapers might be used in different scenarios to clear surfaces but are not the primary mechanism in electrostatic precipitators. Rappers are thus the correct choice as they specifically target and facilitate the removal of dust that has adhered to the electrodes.