Cleaning and maintenance of the plate cooler of the air cooler after cooler.

Cleaning and maintenance of the plate cooler of the air cooler after cooler. In addition to the overhaul under special circumstances, plate heat exchangers should also be regularly maintained. Because the plate heat exchanger is easy to assemble and disassemble, the maintenance is simple, and no special tools and equipment are generally needed. Different methods can be used according to different situations. If there is no leakage in the equipment, but the heat transfer system K has dropped, then the heat exchanger can be disassembled and a closed circuit system is used to drive the descaling liquid into the equipment for several hours. That's it. There is no such condition at the site, and when the equipment is disassembled or the scale is found to be not serious, you can rinse it directly with water without removing the plate, and brush with a soft brush. Plate cleaning and protection Keeping the plate clean is one of the important conditions for maintaining a high heat transfer coefficient. Between the plates, the medium moves along the narrow and tortuous flow channel. Even if a relatively thick scale layer is generated, it will cause the change of the flow channel, significantly affecting the movement of the fluid, increasing the pressure drop, and the heat transfer coefficient. Decline, for example, when a sugar factory uses a plate heat exchanger for heating, because the secondary water is not well treated, the flow channel is blocked in only two months during use, and it cannot continue to operate. 1. Chemical cleaning method This method is to circulate a chemical solution through the heat exchanger to dissolve and discharge the dirt on the surface of the plate. This method does not need to disassemble the heat exchanger, which simplifies the cleaning process and also reduces the labor of cleaning. Because the corrugation of the plate can promote the turbulent turbulence of the cleaning liquid and is beneficial to the dissolution of the scale layer, the chemical cleaning method is an ideal method. 2. Mechanical (physical) cleaning method This method is to manually wash the plate with a brush, so as to achieve the purpose of removing the dirt on the surface of the plate. Although this method is relatively straightforward, it is not easy to clean the harder and thicker scale layer. 3. The comprehensive cleaning method is difficult to clean if the dirt layer is relatively hard and thick. The comprehensive method is to soften the scale layer first by chemical cleaning method, and then remove the scale layer by mechanical (physical) cleaning method to keep the plate clean. 4. Precautions during cleaning ① During chemical cleaning, the solution must maintain a certain flow rate, generally 0.8 ~ 1.2m / s. The purpose is to increase the degree of turbulence of the solution. ② Different chemical cleaning fluids should be used for different dirt. In addition to the frequently used diluted soda ash solution, a 5% nitric acid solution can be used for scale. For the scale generated in the production of soda ash, a 5% hydrochloric acid solution can be used. However, chemical detergents that corrode the plates must not be used. ③ During mechanical (physical) cleaning, it is not allowed to scrub the stainless steel sheet with a carbon steel brush, so as not to accelerate the corrosion of the sheet. At the same time, the surface of the plate cannot be scratched or deformed. ④ The cleaned plates should be rinsed with clean water and wiped dry. The plates should be prevented from deformation when placed.

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