Which device is commonly used to remove particulates from smokestack emissions?

Which device is commonly used to remove particulates from smokestack emissions?

• A. Electrostatic precipitator
• B. Baghouse filter
• C. Cyclone separator
• D. Wet scrubber

Answer: (A)

Particulates are removed from smokestack emissions most effectively with an electrostatic precipitator because it uses a high-voltage field to charge the particles in the gas stream and then draws them onto collector plates. The charged particles stick to these plates and are periodically removed, forming a dense layer of ash that drops into a hopper. This approach works very well for very small particles (like PM2.5) and can handle large volumes of flue gas with relatively low energy and pressure loss, which is why it’s widely used in power plants and other industrial stacks. Other devices have their roles but aren’t as universally effective for fine particulates in smokestack conditions. Baghouse filters trap particles on fabric and can offer high removal efficiency, but they require more energy for filtration and cleaning and have higher pressure drops. Cyclone separators rely on inertia to remove larger particles and don’t capture the finest particulates well. Wet scrubbers remove gases and particulates by bringing the gas into contact with a liquid, which is great for certain pollutants but not the primary choice for general particulate control in many smokestacks.

Particulates are removed from smokestack emissions most effectively with an electrostatic precipitator because it uses a high-voltage field to charge the particles in the gas stream and then draws them onto collector plates. The charged particles stick to these plates and are periodically removed, forming a dense layer of ash that drops into a hopper. This approach works very well for very small particles (like PM2.5) and can handle large volumes of flue gas with relatively low energy and pressure loss, which is why it’s widely used in power plants and other industrial stacks.

Other devices have their roles but aren’t as universally effective for fine particulates in smokestack conditions. Baghouse filters trap particles on fabric and can offer high removal efficiency, but they require more energy for filtration and cleaning and have higher pressure drops. Cyclone separators rely on inertia to remove larger particles and don’t capture the finest particulates well. Wet scrubbers remove gases and particulates by bringing the gas into contact with a liquid, which is great for certain pollutants but not the primary choice for general particulate control in many smokestacks.