Analysis of the working principle of boiler deoxygenation agent to safeguard the safety of boiler operation

During the operation of the boiler, dissolved oxygen in the water can corrode the metal tube walls of the boiler, causing thinning and damage to the tube walls, shortening the service life of the boiler, and even posing safety hazards. Boiler deoxidizer, as the core agent for solving boiler oxygen corrosion, effectively removes dissolved oxygen in water through a scientific mechanism, ensuring stable operation of the boiler. To help practitioners have a clear understanding of their work logic, the core working principles of boiler deoxygenation agents are summarized as follows.

Boiler deoxygenation agentThe core working principle of chemical deoxygenation is "targeted removal of dissolved oxygen in water". According to different types of agents, it is mainly divided into two categories: chemical deoxygenation and physical deoxygenation auxiliary. Among them, chemical deoxygenation is widely used, and the mechanism of action of different types of chemical deoxygenation agents has its own emphasis, which is suitable for different boiler operation scenarios.

Firstly, reducing oxygen scavengers consume dissolved oxygen in water through chemical reactions. These types of oxygen scavengers (such as sodium sulfite, hydrazine, etc.) have strong reducibility and can undergo redox reactions with dissolved oxygen in water, converting oxygen into harmless substances and removing dissolved oxygen from water. Taking the commonly used sodium sulfite as an example, it reacts with oxygen in water to produce sodium sulfate. The reaction process is mild and free of harmful products, making it suitable for use in medium and low pressure boilers; Hydrazine can react with oxygen under high temperature conditions to generate nitrogen and water, with good deoxygenation effect. It is suitable for high-pressure and high-temperature boilers and can effectively prevent oxygen corrosion.

Secondly, chelating oxygen scavengers lock in dissolved oxygen through chelation. This type of deoxygenation agent (such as EDTA) can form stable complexes with dissolved oxygen and metal ions in water, encapsulating oxygen and preventing it from contacting the metal tube wall of the boiler, thereby avoiding corrosion. At the same time, its networking function can also reduce the content of metal ions in water, lower the probability of scale formation, and have dual effects of deoxygenation and scale inhibition, making it suitable for boiler scenarios with complex water quality and high metal ion content.

Furthermore, physical assisted deoxygenating agents can help improve deoxygenation efficiency. These types of agents (such as defoamers and catalytic oxygen scavengers) do not directly react with oxygen, but improve the deoxygenation environment and accelerate the reaction process to enhance the deoxygenation effect. For example, defoamers can eliminate bubbles in water, allowing dissolved oxygen to better come into contact with chemical oxygen scavengers; Catalytic deoxidizers can reduce the activation energy of oxidation-reduction reactions, accelerate the deoxygenation reaction rate, shorten the deoxygenation time, and reduce the dosage of reagents.

Kind Reminder:Boiler deoxygenation agentThe selection should be based on the actual situation of boiler pressure, water temperature, water quality, etc., and the corresponding type of deaerator should be selected reasonably. The dosage should be strictly used according to the specifications in order to achieve the best deaeration effect. Scientific use of deoxidizers can effectively inhibit boiler oxygen corrosion, extend boiler service life, reduce operation and maintenance costs, and lay a solid foundation for safe and stable operation of boilers.