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Answer: An electrostatic precipitator (ESP) is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge. The process involves three steps: 1) particle charging, where gas with suspended particles enters the ESP and the particles are exposed to a high voltage electric field, inducing an electrostatic charge on them; 2) particle attraction and collection, where charged particles are attracted to positively charged collection plates and trapped on their surfaces, allowing clean gas to flow through; and 3) particle removal and clean gas release, where accumulated particles are removed from the collection plates and the cleaned gas is released into the atmosphere or further processed. The efficiency of an ESP is crucial for its effectiveness in removing particles from the gas stream, with factors affecting efficiency including electric field strength, gas flow rate, and particle size and properties. ESPs can achieve removal efficiency of up to 99% or more for most particles, making them essential for emission control in industrial applications.