It is well known that plate heat exchangers usually produce some scale when they are used, which is caused by improper use of the products
(1)Peeling action: The acid solution can dissolve the oxide on the metal surface of the plate heat exchanger, destroying the combination with the scale, so that the scale attached to the surface of the metal oxide is peeled off and falls off.
(2)Dissolution: The acid solution easily reacts with calcium, magnesium and carbonate scale to form a soluble compound, which dissolves the scale.
(3) Loose effect: For the mixed scale containing silicate and sulfate, since the oxides of calcium, magnesium, carbonate and iron are dissolved in the acid solution, the residual scale becomes loose and the acid solution is easily washed down.
(4)Air enthalpy effect: After the acid solution reacts with calcium, magnesium and carbonate scale, a large amount of carbon dioxide is produced. The carbon dioxide gas of the plate heat exchanger has a certain enthalpy power for the scale layer which is difficult to dissolve or dissolve slowly during the overflow process, so that the scale falls off from the heated surface of the heat exchanger.
When the plate heat exchanger removes scale, the basic principle of the method is different. Correspondingly, the process of reacting scale with its acid solution is also very different. At the same time, when you remove scale, you can decide according to the situation. .