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2022
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02
What are the corrosive factors of combination dryers?
Combination dryers boast high thermal efficiency, a large heat transfer coefficient, and high moisture evaporation rate. Their unique structure provides a large heating surface area within a small volume. The blades ensure thorough heat exchange between the material, the drum, and the hot surface, achieving efficient drying. However, prolonged use can lead to corrosion. Identifying the factors contributing to this corrosion is crucial. What are the causes of this corrosion?
Combination dryers boast high thermal efficiency, a large heat transfer coefficient, and high moisture evaporation rate. Their unique structure features a large heating surface area within a small unit volume. The blades ensure thorough heat exchange between the material, the drum, and the hot surface, achieving the drying objective. However, prolonged use can lead to corrosion. Therefore, identifying the factors contributing to this corrosion is crucial. So, what causes this corrosion?
Causes of Corrosion in Combination Dryers:
1. Metal Properties
Corrosion in combination dryers primarily stems from the use of metallic materials with high chemical activity. Prolonged exposure to humid air causes oxidation and subsequent corrosion. The combination dryer's construction from various metals exacerbates this oxidation reaction.
2. Metal Composition
The purer the metal, the lower the likelihood of corrosion in the combination dryer. Conversely, higher impurity levels increase the susceptibility to corrosion.
3. Surface Condition of Combination Dryer Components
More complex and rough internal component shapes lead to poorer corrosion resistance. Corrosion of one component quickly spreads to adjacent metal parts, accelerating the corrosion process.
4. Environment
High operating temperatures and humidity, or environments rich in oxygen and chloride ions, readily react with the combination dryer, accelerating corrosion.
5. Acid Corrosion of Combination Dryers:
Dryer trays can be damaged by corrosive acids. We conducted fundamental research on the tray's performance. However, the trays exhibit good resistance to most acids. Three types cause significant damage—hydrofluoric acid, phosphoric acid, and phosphorous acid. Corrosion occurs rapidly when trays are exposed to these acids, especially in concentrated solutions. Temperature also plays a crucial role in accelerating this degradation.
6. Alkali Corrosion:
Dryer tray equipment should be protected from damage and corrosion. The main component of the tray, silica, is highly soluble in alkaline solutions; therefore, chemicals like sodium hydroxide and potassium hydroxide are detrimental. If alkali is used in your process, it should be routed through downpipes. When a rare earth drying tray vessel is needed, the corrosion rate should be factored into your planning. Visual signs of alkali damage include dark, rough, pitted, pinhole, and cutting corrosion.
7. Salt Corrosion:
Salt corrosion of dryer trays results from acid ion erosion. The extent of damage depends on the type of ions formed. Acidic fluorides often cause damage. A good preventative measure is to anticipate the negative effects of these acid ions, such as chlorine and lithium, magnesium, and aluminum. When damage is caused by the liquid phase, flame polishing and a significant loss of surface roughness occur. Gas-phase corrosion is more concentrated in specific areas; repolishing is a good solution for repairing this type of corrosion.
Combination dryer
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