Views: 76 Author: Site Editor Publish Time: 2019-12-31 Origin: Site
A heat exchanger is a device that transfers a portion of the heat of a hot fluid to a cold fluid. Heat exchangers play an important role in industrial production and are widely used. The heat exchanger keeps the plate clean as one of the important conditions for maintaining a high heat transfer coefficient. Between the plates, the medium moves along a narrow, meandering flow path. Even if a less thick scale layer is produced, it will cause a change in the flow path, significantly affecting the movement of the fluid, increasing the pressure drop, and the heat transfer coefficient. decline. So, it is important to keep the plate clean. In this passage, we will introduce three methods to clean the plate and four things which needs caution.
For this method, a chemical solution is circulated through the heat exchanger to dissolve and discharge the dirt on the surface of the plate. This method does not require disassembling the heat exchanger, which simplifies the cleaning process and reduces the labor level of cleaning. Since the corrugation of the sheet can promote the turbulent flow of the cleaning liquid and facilitate the dissolution of the dirt layer, the chemical cleaning method is an ideal method.
In this method, the plate is manually washed with a brush to achieve the purpose of removing dirt on the surface of the plate. Although this method is relatively straightforward, it is not easy to clean the harder and thicker dirt layer. And it is hard for a brush to clean every corner.
In the case where the dirt layer is relatively hard and thick, it is difficult to clean by simply using one of the above methods. The comprehensive method is to first soften the scale layer by chemical cleaning, and then remove the scale layer by mechanical cleaning method to keep the sheet clean.
1)The solution should maintain a certain flow rate during chemical cleaning, generally 0.8~1.2m/s. Its purpose is to increase the degree of turbulence in the solution.
2)Different chemical cleaning solutions should be used for different soils. In addition to the frequently used diluted soda ash solution, a 5% nitric acid solution can be used for the dirt. For the scale generated in the production of soda ash, a 5% hydrochloric acid solution can be used. However, chemical lotions that corrode the plates should not be used.
3)Mechanical cleaning is not allowed to brush stainless steel with a carbon steel brush to avoid corrosion of the plate. At the same time, the surface of the plate cannot be scratched or deformed.
4)After cleaning, the plate should be rinsed with water and dried, and the plate should be prevented from being deformed.
It is common in our daily life that there is scale deposit on the plate of heat exchanger, which will influence the function of the heat exchanger. With the three cleaning methods and four precautions, we can deal with the problem by ourselves and clean the exchanger easily. But if we encounter something we can’t solve, we’d better seek the help of professional workers. Hopefully, this passage will help you.
