What does an Attemperator do?
Boiler attemperators are used to fine tune / control steam temperature from a boiler, as well as the steam temperature between boiler stages.
What is the difference between desuperheater and Attemperator?
An attemporator controls the steam temperature while a desuperheater removes whatever superheat there is in steam and reduces the temperature to a point at or nearly at saturation temperature.
What is steam Attemperation?
Attemperation involves simply controlling the temperature of the steam, without any direct regard for the level of superheat. Desuperheating, as a control operation, is not directly related to the temperature of the steam, just the degree by which it exceeds the saturation temperature at the current condition.
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.
Why do we need steam temperature control?
Keeping steam temperature constant is also important for minimizing thermal stresses on the boiler and turbine. Steam temperature is normally controlled by spraying water into the steam between the first and second-stage superheater to cool it down.
Where is Attemperator in boiler?
Attemperators are fitted between the 1st and the 2nd stage superheaters in the boilers. They help in achieving the right output temperatures of the steam.
Why are desuperheater used?
Desuperheating systems are used to reduce the temperature of process steam by spraying water into superheated steam, thereby reducing its enthalpy. Steam-conditioning systems combine the desuperheating function with pressure reduction.
Why Attemperator is used in boiler?
Attemperator is a spray of water to reduce the steam temperature that is limited as per the operational requirements. An Attemporator spray reduces the steam temperature in the superheater zones of a boiler so as to maintain around 535-540 degree centigrade temperature at the inlet of the steam turbine.
What is meant by Attemperator?
Definition of attemperator : a coil of pipe through which hot or cold water may be run for regulating temperature.
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.
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 are the different methods of steam temperature control?
The spry water comes from either an intermediate stage of the boiler feed water pump or from the pump discharge. Other methods of Steam temperature control include flue gas recirculation, flue gas bypass, and tilting the angle at which the burners fire into the furnace.