What is the purpose of an air ejector in shipboard systems?

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Multiple Choice

What is the purpose of an air ejector in shipboard systems?

The main idea is removing non-condensable gases to keep the condenser and related steam systems under vacuum. In shipboard condensers, a strong vacuum lowers the condenser pressure, which improves condensation of exhaust steam and boosts overall turbine efficiency. Non-condensable gases (like air and dissolved gases) accumulate in the condenser and on heat transfer surfaces, creating a layer that reduces heat transfer and raises condenser pressure. An air ejector uses motive steam to suck out these gases and vent them to a receiver or atmosphere, keeping the vacuum conditions steady. It isn’t used to supply combustion air, monitor oxygen, or cool circulating water.

The main idea is removing non-condensable gases to keep the condenser and related steam systems under vacuum. In shipboard condensers, a strong vacuum lowers the condenser pressure, which improves condensation of exhaust steam and boosts overall turbine efficiency. Non-condensable gases (like air and dissolved gases) accumulate in the condenser and on heat transfer surfaces, creating a layer that reduces heat transfer and raises condenser pressure. An air ejector uses motive steam to suck out these gases and vent them to a receiver or atmosphere, keeping the vacuum conditions steady. It isn’t used to supply combustion air, monitor oxygen, or cool circulating water.

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