+
Cards In This Set
| Front | Back |
|
Two of the major jobs that a boiler drum performs are ____ _____ for the boiler and _____ _____ from the boiler before it goes to the turbine.
|
Receiving feedwater / collecting steam
|
|
List 2 reasons why circulation is necessary in the boiler.
|
Provides a constant supply of water to be turn to steam.
Carries intense heat of the boiler furnance away from the water wells.
|
|
What affects natural circulation in a drum type boiler?
|
Amount of heat produced in the furnace.
The height of the boiler.
The pressure at which the boiler operates.
|
|
Drum boilers that have pumps to help circulate water through the downcomers are called ____ ____ boilers.
|
Controlled circulation
|
|
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.
|
Dryers
|
|
What is boiling?
|
Convert water into steam.
|
|
The temperature at which water will boil at a given pressure is called the _____ ______.
|
Saturation temperature
|
|
Whenever water and steam are present together, the temperature of both the water and the steam will always be ____________________________.
|
The saturation temperature for the existing pressure.
|
|
_____ increase the efficiency of boilers by using heat that would otherwise be lost up the stack.
|
Superheaters
|
|
A ______ superheater is located in a direct "line of sight" with the furnance flames.
|
Radient
|
|
What do attemperators do?
|
Keeps final temperature from becoming too hot cause damage to metal.
|
|
Before steam flows from the HP section of the turbine to the IP section, it is often returned to the _____ for reheating.
|
Boiler
|
|
The point at which there is no distinguishable difference between water and steam is called the _____ ______.
|
Critical point
|
|
Boilers that operate at ________ temperatures and _______ have a built-in inefficiency.
|
Subcritical / pressures
|
|
In a once-through boiler _____ _______ ______.
|
Water goes through only once
There is no recirculation flow path
The temperatures and pressures are often supercritical
|
