Steam boilers are commonly used thermal energy equipment in industrial production, and boiler water treatment refers to the chemical treatment of the water used in boilers to protect them, improve thermal efficiency, and extend the service life of equipment. Below, we will introduce the working principle of boiler water treatment from several aspects.
The main purpose of boiler water treatment is to protect the boiler and its accessories, and improve thermal efficiency. Specifically, it mainly includes the following three aspects:
1. Prevention of corrosion: Boilers are prone to corrosion during operation. If water treatment is not carried out, it can cause corrosion to the inner walls, pipelines, and other accessories of the boiler, exacerbating the degree of boiler damage.
2. Preventing scaling: During the operation of the boiler, water containing a large amount of calcium, magnesium and other substances can form scaling, affecting thermal efficiency and even posing a risk of boiler explosion.
3. Prevention of foam: if foam appears in the boiler, the water surface will drop, forming a gap, thus exposing the heating surface to the air, thus shortening the service life of the boiler.
The methods of boiler water treatment mainly include physical methods, chemical methods, and biological methods.
1. Physical method: This method refers to the removal of impurities and pollutants from water through physical means. This includes methods such as natural precipitation, filtration, and ion exchange.
2. Chemical method: This method refers to the removal of pollutants and impurities from water by adding chemical agents. Including the addition of chelating agents, oxidants, corrosion inhibitors, etc.
3. Biological method: This method refers to the use of microorganisms to remove harmful substances from water. Including microbial degradation method, plant purification method, etc.
Water quality requirements
Water quality is one of the important factors affecting boiler operation. The following are common boiler water quality requirements:
Water hardness: The hardness of boiler water is required to be between 75-100mg/L to prevent scale and exacerbate corrosion.
Alkalinity of water: The alkalinity of boiler water is generally 60-400mg/L to maintain stable operation of the boiler.
Oxygen content in water: In boilers, oxygen in water is prone to corrosion, and its content is generally required to be below 7mg/L.
Boiler water treatment is an important measure to protect boilers and their accessories and improve thermal efficiency. There are various treatment methods, and it is necessary to choose the appropriate method based on the actual situation and water quality to achieve the best treatment effect.
