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Turndown ratio refers to the width of the operational range of a device, and is defined as the ratio of the maximum capacity to minimum capacity. For example, a device with a maximum output of 10 units and a minimum output of 2 units has a turndown ratio of 5.
A deaerator is a device that is used for the removal of dissolved gases like oxygen from a liquid. Thermal deaerators are commonly used to remove dissolved gases in feedwater for steam-generating boilers .
Use of a deaerator. Degasification, the removal of dissolved gases, such as oxygen, from liquids. This page was last edited on 23 ...
A deaerator is a special case of the open feedwater heater which is specifically designed to remove non-condensable gases from the feedwater. Closed feedwater heaters are typically shell and tube heat exchangers where the feedwater passes throughout the tubes and is heated by turbine extraction steam. These do not require separate pumps before ...
Deaerators are used for many types of boilers and steam generators such as waste heat boilers, gas turbine cogeneration systems, large petroleum refinery and petrochemical plant utility boilers, thermal power plants (or power stations), and many others.
Dissolved oxygen is removed by injecting auxiliary exhaust steam into the upper portion of the tank (above the feed water level) at roughly the same location (elevation) that the condensate enters the tank.
Powder Deaerators consist of two parallel drums – a filter drum and a pressure drum – which rotate in opposite directions. The drums are driven via drive motor and spur gear. The filter drum is coated with a porous sinter metal layer. It is connected to a vacuum line via a hollow shaft creating a negative pressure within the filter drum. An ...
The level of water in the steam separator is mainly controlled by the feedwater supply, with the deaerator tanks serving as a water reservoir. The maximum allowed heat-up rate of the reactor and the coolant is 10 °C (18 °F)/h; the maximum cool-down rate is 30 °C (54 °F)/h. [15]