Technical requirements for maintenance and cleaning of plate heat exchanger_
The 165 plate heat exchanger has a small circulation cross section, fouling and clogging cause the efficiency of the heat exchanger to decrease, which affects the heating effect. Therefore, choosing a reasonable cleaning method has become a necessary means to improve the heat exchange efficiency and prolong the service life of the equipment. Today, the editor will share with you the technical requirements for the maintenance and cleaning of plate heat exchangers ① For equipment that needs to be repaired, the heat exchangers should be disassembled retrogradely in the order of installation. ② Equipment used in petroleum, stainless steel and other industries should be regularly repaired in accordance with the maintenance cycle. ③ If the medium in the equipment is flammable, explosive or corrosive, it needs to be repaired at least once a year. ④ The plate heat exchangers used in other industries should be repaired once every three years, even if there is no leakage. The three important conditions for the heat exchanger to maintain a high heat transfer coefficient are: the cleaning of the plates, the protection of the plates, and the cleaning and maintenance of the plates. Between the plates, the medium moves along a narrow and tortuous flow channel. Even if a not too thick scale is produced, it will cause changes in the flow channel, which will significantly affect the movement of the fluid and increase the pressure drop. The heat transfer coefficient decreases, and the following three cleaning methods are commonly used at present: 1. (Chemical cleaning method) This method is to circulate a chemical solution through the heat exchanger to dissolve the dirt on the surface of the plate, discharge. This method does not need to disassemble the heat exchanger, simplifies the cleaning process, and also reduces the cleaning labor. Because the plate corrugation can promote the violent turbulence of the cleaning fluid and is beneficial to the dissolution of the scale layer, the chemical cleaning method is currently an ideal method. 2. (Mechanical (physical) cleaning method) This method is to manually wash the plates with a brush after disassembling the heat exchanger, so as to achieve the purpose of removing dirt on the surface of the plates. Although the advantage of this method is relatively straightforward, the disadvantage is that it is difficult to clean the harder and thicker scale layer. 3. (Comprehensive cleaning method) For those cases where the dirt layer is relatively hard and thick, it is difficult to clean it by simply using any of the above methods. At this time, it is necessary to use a comprehensive method for cleaning. The comprehensive method is to first soften the scale layer with a chemical cleaning method, and then use a mechanical (physical) cleaning method to remove the scale layer to keep the plate clean and clean. The editor in the above article shared with you the technical requirements for the maintenance and cleaning of the plate heat exchanger. If you have any needs or questions about the plate heat exchanger, the official website of Diguang Heat Transfer welcomes your consultation.