What is steam and its properties?

3.1 Introduction. Steam is a vapour. It is used as the working substance in the operation of steam engines and steam turbines. As stated in chapter 2, a vapour is a partially evaporated liquid carrying in it particles of liquid and it can be liquefied by minor changes in temperature or pressure.

Does steam contain oxygen?

The steam heats the water to the saturation temperature of the steam and removes all but the very last traces of oxygen. Most of the steam is condensed and becomes a part of the deaerated water. A small portion of the steam, which contains the noncondensable gases released from the water, is vented to the atmosphere.

Can steam carry chemicals?

Foaming and selective vaporous carryover are the two main mechanisms of chemical carryover. High suspended solids, high dissolved solids, high alkalinity, and process contamination from the condensate system can all cause foaming. Selective vaporous carryover occurs due to the solvent properties of steam.

How does a deaerator remove oxygen?

Deaerators are mechanical devices that remove dissolved gases from boiler feedwater. Deaeration protects the steam system from the effects of corrosive gases. It accomplishes this by reducing the concentration of dissolved oxygen and carbon dioxide to a level where corrosion is minimized.