A vacuum deaerator, a water boiling temperature under vacuum, to remove oxygen, nitrogen, carbon dioxide, water and other gases contained in the device, consists of two parts oxygen tank (an oxygen column) and the vacuum unit composition, oxygen tanks can be high or low arrangement, vacuum pump can be used to steam-powered steam jet pumps to circulate water or water jet pump working medium. An overview of the boiler feed water treatment process, oxygen is a very critical aspect. Oxygen is the main water supply system and boiler corrosive substance, give oxygen in the water should be quickly cleared, otherwise the water supply systems and components it will corrode the boiler goes into the pot and iron corrosion products deposited or attached to the boiler tubes and heat surface, the formation of insoluble iron and dirt poor heat transfer and corrosion will cause the pipe wall occurs point pit, drag coefficient increases. Pipeline corrosion is severe, even pipeline explosion will occur. State regulations evaporation in steam boilers and water temperatures equal to two tons per hour is more than equal to 95 ℃ hot water boilers are required oxygen. Over the years a number of boiler feed water treatment workers have been in search for efficient and economical method of oxygen, and vacuum oxygen method is one excellent one. 2 Principle of the working principle of the vacuum deaerator is the application of Henry's Law and Dalton's law, according to Henry's Law shows that, in a closed vessel, no gas is present in the water, the solubility of the gas is proportional to its partial pressure of its own at the same time, and the solubility of the gas and its partial pressure is only about itself. Under a certain pressure, as the temperature rises, the water vapor partial pressure is increased, and the partial pressure of oxygen in the air and smaller. At 100 ℃, the partial pressure of oxygen is reduced to zero and the dissolved oxygen in the water is also reduced to zero. When the water pressure is less than atmospheric pressure, the solubility of oxygen at low temperature can also be reached zero. Thus, the space is discharged oxygen molecules on the surface, or converted into other gas, causing the oxygen partial pressure of zero, the continuous escape of oxygen in the water, to the effect of oxygen. This method is generally oxygen at a temperature of 30 ℃ ~ 60 ℃ conducted. Can achieve the water of oxygen at low temperatures (at 60 ℃ or room temperature), to heat boilers and load fluctuations and poor thermal oxygen effect of steam boilers are available vacuum oxygen and oxygen to obtain satisfactory results. With respect to the thermal oxygen technical terms: its heating requirements are very low, the boiler room consumable reduce steam consumption, and low vacuum deaerator can be arranged on the operation and management of jet pumps, pressure pumps and other critical equipment requirements than the heat Oxygen higher. Low arrangement also requires a certain height difference, but also for injection pumps, pressure pumps and other critical equipment operation and management requirements are high.