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an electrostatic precipitator is a device in which a dusty air stream is passed through some plates carrying a high voltage. This adds an electric charge to the dust particles. When the air stream then passes close to some plates that are grounded, then the charges attract the dust to the plates, and the dust is captured for disposal.

Some furnace processes create a lot of fly ash, and the above device is typically used to capture the dust.

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Q: How does a electrostatic precipator work?
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