Somerscales in addition to Knudsen (1981) convey identified 6 categories off fouling:
- Particulate fouling. The accumulation ofsolid particles is suspended inward the procedure flow on the oestrus transfer surfaces. Typical examples include dust deposition, particles carried inward condenser cooling water, in addition to unburned fuel, or wing ash. If the enterprise deposition is due to gravity, the procedure is referred to every bit sedimentation fouling.
- Precipitation fouling. Dissolved substances carried inward the procedure flow are precipitated on the oestrus transfer surfaces. Examples include carbonates, sulfates, in addition to carbonates. Scaling occurs when atmospheric precipitation occurs on heated rather than cooled surfaces.
- Chemical reaction fouling. In for certain cases, deposits on the oestrus transfer surfaces which are not, inward themselves, reactants are formed past times chemic reactions. In this type off ouling, swell in addition to coking ofhydrocarbons in addition to polymerization are typical examples.
- Corrosion fouling. In this type of fouling, the oestrus transfer surface reacts, at for certain pH levels, to gain products that adhere to the oestrus transfer surfaces, in addition to inward turn, this may promote the attachment of additional fouling materials. Sulfur inward fuel stone oil in addition to sulfur products inward the flue gas, such every bit sulfur dioxide, tin atomic number 82 to sulfuric acid. This has caused, for example, meaning harm to oestrus central surfaces inward air heaters inward the ability industry.
- Biological fouling. Materials such every bit algae, bacteria, molds, seaweed, in addition to barnacles carried inward the procedure flow effort biological fouling of the oestrus transfer surfaces. Influenza A virus subtype H5N1 prime number instance of biological fouling is inward marine ability institute condensers.
- Freezing fouling. In this type off ouling, a liquid, or around ofits higher-eltingpoint components volition deposit on a subcooled oestrus transfer surface.