Working principle of vacuum deoxygenation
2025-06-30 15:55:49
The working principle of vacuum deoxygenation is to apply Henry's law and Dalton's law. According to Henry's law, in a closed container, if any gas exists on the water surface at the same time, the solubility of the gas is proportional to its own partial pressure, and the solubility of the gas is only related to its own partial pressure. Under a certain pressure, as the water temperature increases, the partial pressure of water vapor increases, while the partial pressure of air and oxygen decreases. At 100 ℃, the partial pressure of oxygen decreases to zero, and the dissolved oxygen in water also decreases to zero. When the pressure on the water surface is lower than atmospheric pressure, the solubility of oxygen can also reach zero at lower water temperatures. In this way, oxygen molecules on the water surface are expelled or converted into other gases, resulting in zero partial pressure of oxygen. Oxygen in the water continuously escapes, achieving the effect of deoxygenation.
This deoxygenation method is generally carried out at a temperature of 30 ℃ to 60 ℃. It can achieve deoxygenation at low temperatures on the water surface (at 60 ℃ or room temperature), and vacuum deoxygenation can be used to achieve satisfactory deoxygenation effects for thermal boilers and steam boilers with large load fluctuations and poor deoxygenation effects. Compared to thermal deoxygenation technology, its heating conditions are very low, the self consumption of steam in the boiler room is reduced, and the vacuum deaerator can be arranged at a low position, which requires higher requirements for key equipment such as jet pumps and booster pumps for operation and management than thermal deoxygenation. Low level layout also requires a certain height difference, and there are high requirements for the operation and management of key equipment such as jet pumps and booster pumps.
This deoxygenation method is generally carried out at a temperature of 30 ℃ to 60 ℃. It can achieve deoxygenation at low temperatures on the water surface (at 60 ℃ or room temperature), and vacuum deoxygenation can be used to achieve satisfactory deoxygenation effects for thermal boilers and steam boilers with large load fluctuations and poor deoxygenation effects. Compared to thermal deoxygenation technology, its heating conditions are very low, the self consumption of steam in the boiler room is reduced, and the vacuum deaerator can be arranged at a low position, which requires higher requirements for key equipment such as jet pumps and booster pumps for operation and management than thermal deoxygenation. Low level layout also requires a certain height difference, and there are high requirements for the operation and management of key equipment such as jet pumps and booster pumps.
