To keep an electrostatic precipitator working effectively, you should?

Having a good rapping system is essential for the effective operation of an electrostatic precipitator (ESP). Electrostatic precipitators rely on electrical fields to charge particles in the flue gas, allowing them to be collected on oppositely charged plates. Over time, dust and particulate matter can build up on these plates, forming a cake layer that can reduce the efficiency of particle collection.

The rapping system periodically loosens this accumulated dust by physically shaking or 'rapping' the collection plates. This action dislodges the accumulated particles, allowing them to fall into a hopper for removal. A well-functioning rapping system ensures that the ESP maintains optimal performance by reducing resistance to airflow and maintaining high collection efficiency.

While the other options may seem relevant, they do not directly address the crucial maintenance aspect of keeping the collection surfaces clean and effective.