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Summarize the cleaning and maintenance methods of plate heat exchanger
Release time:
2020-09-09
Under special circumstances, plate heat exchangers should be maintained regularly in addition to maintenance.
Under special circumstances, plate heat exchangers should be maintained regularly in addition to maintenance. The plate heat exchanger is easy to disassemble and maintain, and generally does not need special tools and equipment. In different cases, different methods can be used. If there is no leakage in the equipment and the heat transfer system drops, the closed-circuit system can be used to replace the heat exchanger for decomposition, and the descaling agent can be placed on the equipment for several hours. Now let's summarize the cleaning and maintenance methods of plate heat exchanger.
1、 Normal operation and maintenance of plate heat exchanger cleaning and maintenance methods
1. The equipment to be repaired shall be driven in reverse direction according to the installation sequence, and the heat exchanger shall be removed.
2. Equipment used in the petroleum and chemical industry should be regularly maintained according to the maintenance cycle.
3. If the medium in the equipment is flammable, explosive or corrosive, it should be repaired at least once a year.
4. If the plate heat exchanger used in other industries does not leak, it is recommended to repair it once every three years.
2、 Cleaning and protection of the plates and keeping the plates clean are important conditions for maintaining high heat transfer coefficient
Between the plates, the medium moves along the narrow and tortuous flow path. When the thickness is not too thick, the formation of layer teeth and the change of flow path also greatly increase the influence on the fluid movement. The pressure drop increases and the heat transfer coefficient decreases.
1. Chemical cleaning method This method is to circulate a kind of eggplant chemical solution to dissolve and discharge the dirt on the surface of the heat exchanger. The tooth method does not need to disassemble the heat exchanger, which simplifies the cleaning process and reduces the labor level of cleaning. The plate ripple promotes the intense turbulence of the cleaning solution and is conducive to the dissolution of the time layer, so the chemical cleaning method is an ideal method.
2. Machine (physical) cleaning method This method is to manually clean the board with a brush to remove the dirt on the board surface. The tooth method is relatively direct, but it is not easy to clean the hard and thick scale layer.
3. When the dirt layer is hard and thick, the comprehensive cleaning method is also difficult to clean by simply using one of the methods. The comprehensive method is to soften the dirt layer with chemical cleaning method, and then remove the dirt layer with mechanical (physical) cleaning method to keep the plate clean.
3、 Cleaning and maintenance methods of plate heat exchanger and precautions during cleaning
1. During chemical cleaning, the solution should maintain a certain flow rate, generally 0.8~1.2M/s. The purpose is to increase the turbulence of the solution.
2. Use different chemical cleaning solution for different dust. In addition to the diluted soda ash solution often used, 5% nitric acid solution can also be used for scale.
3. Wash with clean water to prevent the deformation of the board when it is placed.
