Section 4.2.6. Gas-Solid Separation (Gas Cleaning) PART 2

Which statement is true about impingement separators?

• They use electrical forces

• Particle momentum causes them to strike baffles

• Suitable for submicron particles

• Pressure drop is negligible

In designing a cyclone for gas-solid separation, increasing tangential velocity:

• Reduces separation efficiency

• Increases centrifugal force, improving efficiency

• Has no effect

• Causes emulsion formation

A high-efficiency ESP is installed in a power plant. Which precaution is needed?

• Regular vibration cleaning

• High-pressure gas supply

• Cooling of dust particles

• Precoating filter medium

Which equipment is best for dust removal when the particle density difference is extremely small?

• Cyclone

• Settling chamber

• Electrostatic precipitator

• Impingement separator

A plant requires continuous removal of fine dust and occasional recovery of solids. Which combination is best?

• Cyclone + wet scrubber

• Bag filter + vibratory cleaning

• Settling chamber + venturi scrubber

• ESP + cyclone

Which gas-cleaning device is suitable for extremely high-temperature gas streams (>400°C)?

• Settling chamber

• Wet scrubber

• Bag filter with synthetic fibers

• ESP

Which method is most appropriate when both particle removal and neutralization of acidic gas is required?

• Cyclone

• Wet scrubber

• Bag filter

• Settling chamber

In a plant with flammable dust, which equipment is least suitable?

• Cyclone

• ESP

• Settling chamber

• Bag filter

Which statement about bag filters is false?

• They use fibers to capture particles

• They can remove particles down to ~1 μm

• They are self-cleaning without vibration or reverse gas flow

• They are suitable for high dust loads

A plant wants low-maintenance separation for coarse dust only, with no concern for fine particle removal. Recommended equipment:

• Cyclone

• Settling chamber

• ESP

• Wet scrubber