Thread Content
Installation and usage methods of heat exchangers: Plate heat exchangers can be installed in two ways, depending on whether they have saddle supports or not. Firstly, for plate heat exchangers that do not have saddle supports, the heat exchanger should be installed on a brick-built saddle foundation; after installation, the plate heat exchanger does not need to be fixed to the foundation, allowing it to move freely as it expands. Secondly, for plate exchangers with saddle supports, concrete should first be poured on the foundation; once it has completely dried, the saddle supports should be firmly fixed to the concrete floor using anchor bolts. During the installation of plate heat exchangers, sufficient space should be left at both the front and rear ends of the exchanger for maintenance and cleaning. The heat exchanger must not be operated under conditions exceeding those specified on the nameplate. The temperature and pressure of the medium flowing through the heat exchanger should be monitored and analyzed to prevent abnormal operation of the device. The heat exchange efficiency of a heat exchanger is closely related to scale; the more scale there is, the worse the heat exchange performance becomes. Therefore, the scale on the heat exchange fins should be cleaned promptly. To prevent excessive buildup from affecting the heat exchange efficiency. Cleaning and routine maintenance methods for heat exchangers: Due to the presence of small amounts of calcium and magnesium ions in water, as well as microorganisms such as bacteria, scale tends to accumulate on the smooth plates of heat exchangers over time, and bacteria also multiply. Scale is formed due to the presence of calcium and magnesium salts in water; the solubility of some of these salts decreases as temperature rises, and the resulting crystalline salts accumulate on the surfaces, forming scale. Scale has poor thermal conductivity, and its accumulation on the plates will inevitably affect their heat exchange efficiency. If effective cleaning is not carried out over an extended period, the increasing accumulation of scale will reduce the flow cross-section (as shown on the corrugated surface of the plates), increasing the flow resistance; in severe cases, it may even block the flow cross-section. Therefore, regularly cleaning scale is essential to ensure the efficiency of heat exchange in plate exchangers. The most commonly used cleaning method at present is chemical cleaning and sterilization. During cleaning, chemicals and disinfectants are added to cause a chemical reaction with the scale, rust, bacteria, and other contaminants on the plates, allowing them to be removed and restoring the smooth surface of the plates. Furthermore, for routine maintenance, corrosion and scale inhibitors can be appropriately added to prevent the crystallization and precipitation of calcium and magnesium ions. In cases with favorable conditions, methods such as magnetization and ion rod scaling prevention treatment, as well as sodium ion exchange treatment, can be employed.