There are many kinds of heat exchanger equipment, but no matter what type of heat exchanger, after running for a period of time, a layer of white fouling adheres to the inner and outer walls of the heat exchanger. The main reason for scale formation is that there are less soluble calcium and magnesium salts in the water. These salts have the same characteristics. Their solubility decreases with the increase of water temperature and become difficult salt.
The influence of scale after heat exchanger on equipment:
1. Scale attached to the heat transfer surface is difficult to remove, which increases the overhaul costs. It not only consumes manpower and material resources, but also damages the heating surface and reduces the life of the heat exchanger.
Secondly, the scale will reduce the flow cross-section inside and outside the heat transfer surface and increase the flow resistance of circulating water inside and outside the heat transfer surface. If the flow cross-section is very small, or even completely blocked, the heat exchanger will not work properly.
3. Scale has poor thermal conductivity, which is 30-50 times less than that of iron and steel. The existence of scale will deteriorate the heat transfer on the heating surface, so that the heat transfer surface can not reach the desired temperature drop. According to the relevant information, the heat exchanger will reduce efficiency by about 10% after the experiment, which produces 1 mm thick scale.
Treatment of fouling in heat exchanger:
1. add medicine softening treatment. Softening treatment by adding medicine is a kind of practical anti-fouling water treatment method with the characteristics of simple method, high efficiency, good economy and no special water-making equipment. According to different dosing methods, there are two kinds of positive treatment and anti scaling treatment.
2. ion rod scale water treatment. Anti scaling treatment of ionic rods is a new and advanced water treatment equipment. It has been applied in hot water circulation system, central air conditioning system and circulating cooling water system with satisfactory scale prevention effect. It is a promising new water treatment equipment, especially in heat exchanger, and the effect will be more remarkable.
3. magnetization and scale prevention. The principle of magnetization and scale prevention is to make use of the polarity of water molecules, that is, water molecules are covalently bonded. When water flows through a high-intensity magnetic field, the interaction between the multimolecular associations and the ionic magnetic field in the water, the associations formed by the original single ions are split into single or short-bonded associations, which cut the magnetic field lines vertically at a certain speed to generate induced current. Therefore, each ion establishes a new magnetic field in the same direction as the external magnetic field, and the adjacent polar ion molecules compress and attract each other orderly, resulting in the change of crystallization conditions. The crystals formed are very relaxed, poor in compression and tensile strength, and very brittle, and their adhesion and adhesion are weak, and they do not. It is easy to deposit on the heating surface to form scale.
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