The main function and practical popularization of boiler deoxygenation agent

During the normal operation and long-term maintenance of boilers, deoxidizers are key agents to ensure the safety, stability, and long-term operation of boilers. They are widely used in various boiler systems such as industrial boilers, power plant boilers, hot water boilers, and steam boilers. Oxygen is an important factor causing corrosion of boiler equipment, pipeline blockage, and decreased operating efficiency. Adding and using boiler deoxygenation agents is an indispensable step in the boiler water treatment process. This article provides a detailed introduction to the core role of boiler deoxygenation agents, helping relevant personnel to scientifically understand and standardize the use of such agents.

1、 Core function: Remove dissolved oxygen in water and prevent equipment corrosion

Boiler feedwater and circulating water usually contain a certain amount of dissolved oxygen. In high-temperature and high-pressure operating environments, oxygen can cause strong oxidative corrosion to the metal heating surfaces, pipelines, steam drums, heads, welds, and other parts of the boiler, commonly known as oxygen corrosion.

Boiler deoxygenation agentThe main and core function is to quickly remove free oxygen and bound oxygen from water through chemical reactions, reduce the oxygen content of water, block the contact between oxygen and metal surfaces, thereby preventing oxidation and corrosion of metal components, and protecting the inner walls, pipelines, and heat exchange surfaces of boilers from damage.

Boilers that do not undergo deoxygenation treatment for a long time may experience problems such as pitting corrosion, crevice corrosion, and uniform corrosion on the inner wall. Mild cases can lead to thinning of the pipe wall and decreased pressure bearing capacity, while severe cases can cause safety accidents such as leakage and pipe bursting. Deoxidizers can eliminate such hidden dangers from the root and extend the overall service life of the boiler.

2、 Auxiliary function: passivate the metal surface and form a protective film

High quality boiler deaerator not only removes oxygen from water, but also forms a dense, stable, and strong adhesion passivation protective film on the inner wall of metal equipment. This film isolates water, oxygen, and other corrosive media from direct contact with the metal substrate, achieving secondary protection.

Passivation protective film has the characteristics of high temperature resistance and water flow erosion resistance, which can suppress the occurrence of new corrosion and slow down the deterioration of existing slightly corroded areas, keeping the metal surface in good condition and further improving the durability and operational safety of boiler equipment.

3、 Improve water quality and reduce the accumulation of scale and impurities

Dissolved oxygen not only causes corrosion, but also reacts with iron ions, calcium and magnesium ions in water to form rust and oxide precipitates, which adhere to the heating surface of the boiler and the inner wall of the pipeline, forming hard scale and impurity deposits.

usedeoxidizerAfter removing dissolved oxygen, the generation of such oxidized precipitates can be reduced, the probability of scale formation can be lowered, the pipeline can be maintained unobstructed, and the heat transfer efficiency of the heating surface can be guaranteed. Meanwhile, a clean heating surface can prevent heat accumulation and local overheating, reduce energy consumption and waste, and keep the boiler running.

4、 Ensure the safe operation of boilers and reduce maintenance costs

Oxygen corrosion is one of the main reasons for the high incidence of boiler equipment failures. Pipeline leaks, equipment maintenance, and shutdown replacement caused by corrosion can result in high maintenance costs and shutdown losses.

Standardizing the use of deoxidizers can significantly reduce corrosion failures, lower equipment maintenance frequency, extend boiler overhaul cycles, and save the cost of frequent maintenance and component replacement. At the same time, it can also ensure the stability of boiler pressure and temperature, avoid safety accidents caused by corrosion damage, and safeguard the bottom line of safety production.

5、 Classification of common boiler oxygen scavengers

Boiler deoxidizers on the market are mainly divided into two categories based on their composition and applicable scenarios, suitable for boiler systems with different pressures and temperatures:

1. Chemical reduction type deoxidizer

This type of deoxygenation agent removes oxygen through a reduction reaction. Common components include sodium sulfite, hydrazine, carbazide, sodium ascorbate, etc. It is suitable for medium and low pressure, medium and high pressure boilers, with fast deoxygenation speed and stable effect, and is a commonly used type in industrial scenarios.

2. Organic composite deoxidizer

Mainly composed of organic deoxygenation components, compounded with passivation and corrosion inhibition components, non-toxic and environmentally friendly, with good passivation effect and no secondary damage to equipment, suitable for hot water boilers, low-pressure steam boilers, and scenarios with high environmental requirements.

6、 Precautions for use

When using boiler deaerator, it is necessary to select the appropriate type of agent according to the boiler type, feedwater quality, and operating parameters, strictly add according to the ratio, and control the dosage and frequency of addition. Insufficient dosage can lead to poor deoxygenation, while excessive dosage can result in wastage of chemicals and even affect water quality. At the same time, in conjunction with boiler discharge and water quality monitoring, it can achieve better deoxygenation and anti-corrosion effects.

summary

In conclusion,Boiler deoxygenation agentThe core function is to remove dissolved oxygen in water, prevent metal oxygen corrosion, and at the same time, it has multiple values such as passivation protection, improving water quality, enhancing operational efficiency, reducing operation and maintenance costs, and ensuring equipment safety. Proper deoxygenation treatment of boilers is a key measure to extend their lifespan, ensure stable operation, and control operating costs. It is also a work implemented in the daily operation and maintenance of boilers.