15 Questions
What is the main purpose of using deaerators in boiler feedwater systems?
To remove dissolved gases from the feedwater
How does an increase in temperature affect the solubility of dissolved gases in water?
It decreases the solubility of dissolved gases
What role does steam flow play in deaerator operation?
It ensures efficient mixing to support gas scrubbing
How does the use of trays contribute to the efficiency of a deaerator?
It increases the surface area of the water
What happens to dissolved gases when water is heated to just below its saturation temperature in a deaerator?
They come out of solution and are vented
What is the main problem caused by dissolved gases coming out of solution at high temperatures in boilers?
Corrosion
What are the two basic deaerator configurations mentioned in the text?
Tray type and spray type
What is the purpose of cascading water down several trays in a deaerator?
To increase the surface area of the water and promote greater water-steam contact
What is the function of spray nozzles in a spray-type deaerator?
To break up the inlet water into small particles to promote water-steam contact
In a tray-type deaerator, how is the water flow broken up for the deaeration process?
By trickling down over a series of trays
What is the purpose of a safety valve in a deaerator?
To release excess pressure from the system
What happens to the released gases and remaining steam in a tray-type deaerator?
They pass to the internal vent condenser where most of the steam is condensed and gases are vented to atmosphere
What is a bubbling tray deaerator designed to achieve?
Agitation and intimate contact between steam and water for deaeration
What is unique about a combination deaerator?
It combines both spray and tray principles in the deaeration process
How does a combination deaerator handle released gases and remaining steam?
They pass through the incoming water spray on their way to the vent opening, causing most of the steam that is being carried with the gases to condense.
Test your knowledge about deaeration and boiler feedwater systems. Learn about the process of removing dissolved gases from water to prevent corrosion in boilers.
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