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The damage caused by impurities in water to heat exchangers

2008-01-11View Original

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1. Hazards of impurities dissolved in water in ionic or molecular form: a) Calcium salts. The main compounds present in water include Ca(HCO3)2, CaCl2, CaSO4, CaSiO3, etc. Calcium salts are the main components that cause scaling in heat exchangers. Among them, CaSO4 is a type of water scale that is hard and has a fine crystalline structure; it has a loose structure and low adhesion, forming a relatively soft sludge. It is fluid when separated from water, and can be easily removed even if it adheres to heated surfaces. b. The main components of magnesium salts in water include Mg(HCO3), MgCl2, MgSO4, etc. When magnesium dissolves in water, it decomposes upon heating to form Mg(OH)2 precipitate, which is also a type of sludge-scale water scale. MgCl2 and MgSO4 dissolved in water, at water pH

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