Table of Contents
What is the use of Attemperator?
An attemperator is a part of the 4-stage superheater in the boiler system of the thermal power plant. The attemperator receives the over-heated steam and makes the steam with proper temperature by adjusting the control valve of the cold steam.
How does an Attemperator work?
Principle of Operation Fig. 6952 and Fig. 6953 Attemperator Desuperheaters reduce steam temperature by bringing superheated steam into direct contact with water. The steam is cooled through the evaporation of the water.
What does an Attemperator do on a boiler?
Boiler attemperators are used to fine tune / control steam temperature from a boiler, as well as the steam temperature between boiler stages.
What is an Attemperator valve?
Attemperator Desuperheaters reduce the steam temperature by combining the superheated steam with water. The steam is cooled through the evaporation of the water. The flow control of water is critical to ensure the correct temperature and pressure are achieved.
How does a desuperheater work?
When the desuperheater is operational, a measured amount of water is added to the superheated steam via a mixing arrangement within the desuperheater. As it enters the desuperheater, the cooling water evaporates by absorbing heat from the superheated steam. Consequently, the temperature of the steam is reduced.
What is PRS in boiler?
Pressure reducing stations (PRS) is the arrangement of certain valves which is used to provide the desired steam pressure at user’s end.
What is the purpose of a desuperheater?
Desuperheating is the process by which superheated steam is restored to its saturated state, or the superheat temperature is reduced. Most desuperheaters used to restore the saturated state produce discharge temperatures approaching saturation (typically to within 3°C of the saturation temperature as a minimum).
Why do we need steam temperature control?
The temperature of saturated steam is directly related to its pressure, so tighter control of temperature, elimination of PID requirement and less temperature drift is easily achieved using a steam pressure regulator. Simply put: If you control the pressure of saturated steam, you can control the temperature.
Where is the attemperator located?
Attemperators are typically located between the primary and platen superheaters and also between the platen and final superheaters (Fig. 1). In addition, a reheater attemperator is located between the primary reheater and final reheater [1].
How does a superheater work?
The superheater heats steam above the saturation temperature for a particular boiler pressure. Superheater tubes have steam on one side and hot combustion gases on the other. Surface temperatures are higher here than the boiler tubes.
Why desuperheater is used?
The primary function of a desuperheater is to lower the temperature of superheated steam or other vapors. This temperature reduction is accomplished as a result of the process vapor being brought into direct contact with another liquid such as water.
Why are desuperheater used?
The primary function of a desuperheater is to lower the temperature of superheated steam or other vapors. This temperature reduction is accomplished as a result of the process vapor being brought into direct contact with another liquid such as water. The injected water is then evaporated.
How does a pressure reducing station work?
Designed to withstand even the toughest environments, the pressure reducing valve is a hydraulically operated, diaphragm actuated control valve that reduces higher upstream pressure to lower constant downstream pressure—regardless of the fluctuating demand or the varying upstream force.
What is a PRS system in steam?
How do you maintain steam temperature?
Steam temperature is normally controlled by spraying water into the steam between the first and second-stage superheater to cool it down. Water injection is done in a device called an attemperator or desuperheater.
What does a desuperheater do?
The hot water generating component of a geothermal system is called a desuperheater. It is merely a pump and a heat exchanger that is plumbed in such a way so as to carry the waste heat away from the refrigeration cycle and into your water heater.