There are many types of heat exchanger equipment, but no matter which type of heat exchanger it is, after a period of operation, a layer of white scale will adhere to the inner and outer walls of the heat exchanger. The main reason for the formation of scale is that the water contains calcium and magnesium salts with low solubility. These salts have common characteristics. Their solubility decreases as the water temperature increases, and they become intolerable salts.
       The impact of heat exchanger scaling on equipment:
       1. Scale adheres to the heat transfer surface and is difficult to remove, which increases maintenance costs. It not only consumes manpower and material resources, but also damages the heating surface and reduces the life of the heat exchanger.
       2. After scale is generated, it will reduce the flow cross-section inside and outside the heat transfer surface, and increase the flow resistance of the circulating water inside and outside the heat transfer surface. In severe cases, the flow cross-section will be very small or even completely blocked, which will prevent the heat exchanger from operating normally.
       3. The thermal conductivity of scale is very poor, and its thermal conductivity is smaller than that of steel.30~50Times, the presence of scale will cause the heat transfer of the heating surface to deteriorate, so that the heat transfer surface cannot reach the appropriate temperature. According to relevant information and experiments, it was produced1mmthick scale, the heat exchanger will degrade10%About efficiency.
       How to deal with heat exchanger scaling:
       1. Dosing and softening treatment. Dosing and softening treatment has the characteristics of simple method, high efficiency, good economy and no need for special water production equipment. It is a highly practical anti-scale water treatment method. According to the different methods of dosing, there are two types: corrective agent treatment and anti-scaling treatment.
       2. Ion rod anti-scale water treatment. Ion rod anti-scale water treatment is an emerging water treatment equipment. It is used in hot water circulation systems, central air-conditioning systems, and circulating cooling water systems, and has achieved satisfactory anti-scaling effects. It is a promising new water treatment equipment, especially when used in heat exchangers, the effect is obvious.
       3. Magnetized anti-scale treatment. The principle of magnetized anti-scaling treatment is to utilize the characteristics of water molecules, that is, water molecules are covalently combined. When the water flows through a high-intensity magnetic field, under the action of the multi-molecule associations in the water and the ion magnetic field, the original single scattered poly-ion associations are disassembled into single or short-bond associations, which vertically cut through the external magnetic field at a certain speed.       Magnetic lines of force produce induced current. Therefore, each ion establishes a new magnetic field in the same direction as the external magnetic field, and adjacent polar ion molecules compress and attract each other in an orderly manner, which leads to changes in crystallization conditions. The formed crystals are very loose, have poor compression and tensile resistance, and are very brittle. Their cohesion and adhesion are also very weak, and they are not easy to adhere to the heated surface to form scale.