In modern thermal systems, such as thermal power generation, petrochemical, and heating supply fields, the deaerator is a crucial piece of equipment. It silently safeguards the efficient and stable operation of the system and is closely related to goals such as energy conservation and safety.
I. Core Function of the Deaerator
The core mission of a deaerator is to remove dissolved gases such as oxygen from water. Dissolved oxygen in water can cause corrosion to thermal equipment. Over time, it will shorten the service life of boilers, pipelines, etc., increase maintenance costs, and raise the risk of failures. Through processes like heating and desorption, the deaerator separates and discharges oxygen and other gases from the water, providing qualified deoxygenated water for the thermal system and ensuring the safe and stable operation of the equipment.
II. Working Principle and Types
(I) Working Principle The common thermal deaeration is based on "Henry's Law": the solubility of a gas in water decreases as the temperature rises. The deaerator heats the water to its boiling point, causing the solubility of dissolved oxygen and other gases in the water to drop sharply. These gases then escape from the water and are discharged through an exhaust device, achieving deaeration.
(II) Main Types
Spray - packed Deaerator: It first atomizes the water to increase the contact area between water and steam. Then, it uses a packing layer to enhance heat and mass transfer. It has high deaeration efficiency and a wide application range, and is widely used in large - scale thermal power plants.
Water - distributing Tray Deaerator: Water falls through multiple water - distributing trays and contacts steam in the reverse direction for heating and deaeration. Its structure is relatively simple, and it is suitable for some small and medium - sized thermal systems.
III. Application Value in Industries
(I) Thermal Power Generation Field
In thermal power generation, the deaerator is a key link in the steam - water system. It provides deoxygenated water for the boiler, avoids corrosion of the boiler heating surface, ensures the efficient power generation of the unit, reduces unplanned shutdowns caused by corrosion, and improves the reliability and economy of power generation.
(II) Petrochemical Industry
In petrochemical production, boilers, heating furnaces, etc. require a large amount of qualified make - up water. The deoxygenated water treated by the deaerator can protect these devices from corrosion, maintain stable production, and avoid safety accidents and production losses caused by equipment corrosion and leakage.
(III) Heating Supply System
In urban heating supply systems and other heating systems, the deaerator ensures the water quality of the heating boiler, prolongs the service life of the equipment, and ensures stable heating supply. If the oxygen content in water is high, pipeline corrosion will lead to water leakage and a decrease in thermal efficiency, affecting the heating quality for residents.
IV. Technological Development and Trends
With the increasing requirements for energy efficiency and intelligence in the industry, deaerators are also being upgraded. On one hand, their structures and materials are optimized. Efficient packings and corrosion - resistant materials are adopted to improve deaeration performance and their own service lives. On the other hand, intelligent control is integrated. Parameters such as water temperature and oxygen content are monitored in real - time, and the operating conditions are automatically adjusted to achieve precise deaeration, energy conservation, and consumption reduction.
From ensuring equipment safety to helping industries reduce costs, increase efficiency, and achieve green development, although not "conspicuous", deaerators play the role of "invisible guardians" in thermal systems. In the future, with the innovation of energy technologies, they will continue to evolve and provide protection for the efficient operation of more fields.
