What is the purpose of feed water?
Introduction. A feedwater heater is used in a conventional power plant to preheat boiler feed water. The source of heat is steam bled from the turbines, and the objective is to improve the thermodynamic efficiency of the cycle.
What is feed water control system?
The Feedwater Control System also generates a control signal that can regulate the position of the startup flow control valves. A change in steam mass flow is immediately sensed, and the system adjusts the rate of feedwater flow to balance the two mass flow rates, maintaining this desired water level.
What is feed check valve?
Functions: To allow the feed water to pass/enters into the boiler. To prevent the back flow of water from the boiler, when the feed pump pressure is less than boiler pressure or pump is stopped by using of a non return valve.
What is a boiler feed valve?
Boiler feed valves provide make-up water to the system in the event of system leaks and allow rapid system fill and sustained air purge flow.
What is the main disadvantage of Lamont boiler?
formation of bubbles
Explanation: The main disadvantage of Lamont boiler is the formation of bubbles. These bubbles come in contact with the inner surface of the heating tubes and subsequently are attached to it.
What are the requirements for boiler feed water?
Characteristics of boiler feed water
| Working Pressure (Bar) | ||
|---|---|---|
| 75 – 100 | ||
| Dissolved oxygen (measured before oxygen scavenger addition) | mg/l | 0.02 (Physical removal of dissolved oxygen) |
| Total hardness | French degrees | 0.05 |
| Oily matter | mg/l | 0.05 |
What are the types of feed water control?
Three-element feedwater system, plus density compensation with drum pressure. In addition to the three primary control variables (three elements) — drum level, steam flow, and feedwater flow — drum vapor-space pressure can be utilized to compensate for density changes.
Where is feed check valve located?
Description: The feed check valve is fitted in the water space of the boiler slightly below the normal level of the water. It consists of a check valve CV which moves automatically up and down under the pressure of water on its gun metal seat.
What is auxiliary feed water check valve?
Check valves are installed between the auxiliary feedpumps and the steam generators (or in some plants, the main feedwater system) in order to prevent backflow into the auxiliary feedwater system when it is not in use or when a pump is out of service.
How does a feeder valve work?
The water feed valve adds water to the boiler when needed: If water pressure in the heating boiler drops below 12 psi, the water feeder valve will add makeup water to the system automatically, until it reaches 12 psi inside the boiler.
How do you adjust a boiler water feed valve?
To reset the regulator valve: Remove the fast fill lever cap, and loosen the lock nut. To raise the reduced pressure – slowly turn the adjusting screw clockwise until the system gauge indicates the pressure required. To lower the reduced pressure – turn the adjusting screw counterclockwise.
What is an automatic water feed valve?
The automatic water feed valve reduces the incoming water pressure from the building supply side down to (typically) 12 psi. That’s because the normal in-boiler water pressure, when the heating boiler is cold, is about 12 psi in a normal residential system.
What is a boiler feed water valve?
boiler feed valve. An automatically-controlled valve for maintaining a desired amount of water in a boiler.
What is a feeder valve?
A Feeder is a valve or device that’s main purpose is metering material into or out of something but is not separating a pressure differential. These can be volumetric feeders, vibratory feeders, screw conveyors, OR a Rotary Feeder.