Question 162Steam Plants - Assistant Engineer70% to pass
Which statement is true concerning two-stage air ejector assemblies?
AI Explanation
The correct answer is D. The steam/air mixture from the main condenser is discharged by the first stage air ejector to the inter condenser.
In a two-stage air ejector assembly, the first stage takes suction on the main condenser and discharges the steam/air mixture to the inter condenser. The second stage then takes suction on the inter condenser to further reduce the pressure and remove the remaining air. This allows the system to maintain a higher level of vacuum in the main condenser, improving the overall efficiency of the steam cycle.
The other answer choices are incorrect because: A) the first stage does not take suction on the second stage, B) the condensate is not returned to the main condenser via a loop seal, and C) the air is removed by the ejector assembly, not as the condensate passes through the tubes.
Related Questions
#160 Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler? #161 Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off? #163 Main condensate recirculating systems are primarily intended to _______________.#164 Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank? #165 While vacuum is being raised on the main unit and the turbine is being warmed, condensate is recirculated to the main condenser to _______________.