1.How To Clean Heat exchanger Plates?
(1)Chemical cleaning method.
In this method, a chemical solution is circulated through the heat exchanger to dissolve and discharge the dirt on the surface of the sheet. This method does not require disassembling the heat exchanger, which simplifies the cleaning process and reduces the labor level of cleaning.
(2)Mechanical (physical) cleaning method.
In this method, the heat exchangerplates are manually washed with a brush to achieve the purpose of fouling the surface of the plate. Although this method is relatively straightforward, it is not easy to clean the harder and thicker scale layer.
(3)Comprehensive cleaning method.
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 soften the scale layer by chemical cleaning first, and then remove the scale layer by mechanical (physical) cleaning method to keep the sheet clean.
2.Precautions when heat exchanger plates cleaning.
(1)The solution should maintain the flow rate when the plate heat exchanger is chemically cleaned, generally 0.8-1.2 m/s. Its purpose is to increase the degree of turbulence in the solution.
(2) Different chemical cleaning solutions should be used for different fouling. For the scale produced in soda ash production, a 5 percent hydrochloric acid solution can be used. However, chemical lotions that corrode the plates should not be used.
(3)Mechanical (physical) 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.