Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
Condensate and Boiler feed system |
The purpose of these two is to deliver the condensate from the hotwell of the condenser to the boiler economizer. |
|
|
Condensate Pumps |
The _____ handle water at low pressure and must have a positive head on the suction pipe. |
|
|
Shaft Glands |
It prevents air leakage into the condensate from the pumps. |
|
|
Cavitation |
It can cause rapid wear of a pump impeller and shorten the life of the pump and also causes noise through the pump. |
|
|
Hotwell |
The ____ stores the condensate and also assures a head on the condensate pumps. |
|
|
Evactor |
It uses steam to remove the ncgs from the condenser. |
|
|
Gland steam condenser |
It is next to the evactor where it will pick up heat from the turbine steam seals. |
|
|
U seal |
The ____ seal prevents air from leaking into the condenser. |
|
|
Recirculation |
One way to increase main condensate flow is called ______ which diverts part of the main condensate back to the hotwell to be cooled. |
|
|
Extraction |
Another term for bleed steam. |
|
|
Regenerative cycle |
When steam is bled from the turbine at one or more stages to heat feedwater the steam - water cycle called ____. |
|
|
Heat exchanger |
Another term for HEATER. |
|
|
Closed or non contact type / Open or direct contact type |
Two basic groups of heat exchanger or heaters. |
|
|
Closed or non contact type |
In these heaters the water is separated from the steam by a metal wall. |
|
|
Open or direct contact type |
In these heaters the steam and heater are mixed together to obtain heating. |
|
|
High or Low |
_____ levels in a heater decrease its performance making it less efficient. |
|
|
Heater drainage |
The ____ can be pumped back into a condensate line or allowed to flow to the next lower steam pressure heater. |
|
|
Deaerating heater |
____ is an open type heater where the heated condensate is mixed with extraction steam. |
|
|
Open heater |
____ is simply a shell where all water and steam lines lead into the heater except one large line which drains to and vents the storage tank. |
|
|
Deaerating heater |
Its purpose is to remove dissolved oxygen from the condensate. |
|
|
Boiler feed pump |
It's purpose is to provide the boiler with enough water at a high enough pressure to replace the steam leaving the boiler. |
|
|
Feedwater regulating valve |
A valve that controls the amount of water supplied by the boiler feed pump. |
|
|
Venting |
It is accomplished by bleeding a small quantity of steam and gases from the confined spaces. |
|
|
Internal leakage |
______ through the tube walls cuts down the amount of heat picked up by the water and overloads the draining system. |
