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Where does graphite heat exchanger fouling come from?
Release time:
2021-11-26
For commonly used graphite heat exchangers, according to the scaling mechanism, scaling is generally divided into the following categories.
For commonly used graphite heat exchangers, according to the scaling mechanism, scaling is generally divided into the following categories.
(1) crystallization scale: it refers to the dissolution of inorganic salts in the supersaturated flowing liquid crystals formed and deposited on the surface of the graphite heat exchanger scale, known as crystallization scale, scale is the most common scale in industrial equipment. In the water-cooled system, due to the oversaturation of calcium and magnesium salts in the water, due to changes in temperature, pH, etc., crystallized from the water and deposited on the surface of the graphite heat exchanger, i.e., the formation of scale.
(2)Particle scale:The scale formed by the accumulation of suspended solid particles such as sand, dust, carbon black, etc. on the heat exchange surface in the fluid system.
(3)Chemical reaction scaling:Between the heated surface and the fluid, deposits are formed due to self-oxidation and polymerization reactions, i.e. chemical reactions.
(4)Corrosive scale:Fluid is corrosive or contains corrosive impurities, corrosion of the heat transfer surface, corrosion products deposited on the heat transfer surface to form scale.
(5) biological scale: is the microbial population and its excreta, chemical pollutants, mud and other components attached to the heat transfer pipe wall and piping to form sticky deposits, known as biological scale.
(6) cured fouling: cleaning solution or multi-component solution of highly soluble components in the supercooled heat exchange surface curing deposits formed fouling.
Scaling is usually the result of the interaction of various processes, in the actual fouling of heat exchanger surfaces, a variety of fouling is often mixed together.
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