Deaerators are one of the key equipment in boilers and heating systems. Poor deaeration capacity of the deaerator can result in severe corrosion of the boiler feedwater pipes, economizers, and other auxiliary equipment, leading to economic losses that can be several to hundreds of times the cost of the deaerator. Consequently, the National Electric Power Department has established certain standards for the oxygen content of deaerators, specifying that the oxygen content of the feedwater for atmospheric deaerators should be less than 15 mg/L, and for pressure deaerators, less than 7 mg/L.
Oxygen Removal Principle, Gay-Lussac's Law
At constant pressure, the volume increase of a gas of fixed mass for each 1°C rise in temperature is equal to 1/273 of its volume at 0°C; or the volume of a gas of fixed mass is proportional to its thermodynamic temperature at constant pressure. Discovered in experiments by the French scientist Gay-Lussac, hence the name. Applies to ideal gases and is approximately applicable to real gases under high temperature and low pressure.
Henry's Law: At a given temperature, for dilute solutions, the concentration of the solute in the solution is directly proportional to its partial pressure in the gas phase; Dalton's Law of Partial Pressures: At constant temperature and volume, the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases, and each gas's partial pressure is equal to the pressure it would exert if it alone occupied the total volume.
