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Cards In This Set
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Two of the major jobs that a boiler drum performs are ____ _____ for the boiler and _____ _____ from the boiler before it goes to the turbine.
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Receiving feedwater / collecting steam
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List 2 reasons why circulation is necessary in the boiler.
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Provides a constant supply of water to be turn to steam.
Carries intense heat of the boiler furnance away from the water wells.
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What affects natural circulation in a drum type boiler?
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Amount of heat produced in the furnace.
The height of the boiler.
The pressure at which the boiler operates.
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Drum boilers that have pumps to help circulate water through the downcomers are called ____ ____ boilers.
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Controlled circulation
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Before steam is sent through the outlet pipes of a drum, it is usually sent through _____ to remove additional water that is not removed by the moisture separators.
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Dryers
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What is boiling?
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Convert water into steam.
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The temperature at which water will boil at a given pressure is called the _____ ______.
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Saturation temperature
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Whenever water and steam are present together, the temperature of both the water and the steam will always be ____________________________.
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The saturation temperature for the existing pressure.
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_____ increase the efficiency of boilers by using heat that would otherwise be lost up the stack.
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Superheaters
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A ______ superheater is located in a direct "line of sight" with the furnance flames.
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Radient
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What do attemperators do?
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Keeps final temperature from becoming too hot cause damage to metal.
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Before steam flows from the HP section of the turbine to the IP section, it is often returned to the _____ for reheating.
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Boiler
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The point at which there is no distinguishable difference between water and steam is called the _____ ______.
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Critical point
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Boilers that operate at ________ temperatures and _______ have a built-in inefficiency.
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Subcritical / pressures
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In a once-through boiler _____ _______ ______.
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Water goes through only once
There is no recirculation flow path
The temperatures and pressures are often supercritical
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