The chemical method is used to remove the scale

The fouling of the tube side of the heat exchanger is mainly due to the poor water quality, which forms two forms of coking precipitation and adhesion of scale and oil scale. The chemical method is used to remove the scale. First, the chemical analysis of the scale of the heat exchanger should be analyzed to find out the scale Nature, you can decide which solvent to use for cleaning. Generally, alkaline washing (soda ash, caustic soda, trisodium phosphate, etc.) is used for sulfate and silicate scales, and acid washing (hydrochloric acid, nitric acid, phosphoric acid, hydrofluoric acid, etc.) is used for carbonate scales.

The oil scale of the heat exchanger can be cleaned with sodium hydroxide, sodium carbonate, washing powder, liquid detergent, sodium silicate and water according to a certain ratio to form a cleaning solution. The heat exchanger adopts the chemical cleaning method, and the piping needs to be re-installed on site, which takes more time.

In order to solve the dripping phenomenon caused by the aging of the heat exchanger gasket, the sealing performance of the heat exchanger is allowed to be adjusted, that is, the bolts of the combined heat exchanger are tightened again, and the pressure between the elastic gaskets adjusts the heat exchanger to solve the problem.

Dripping problem. dryer heat exchanger of a heat exchanger with this function, it is usually given that large and small stresses are allowed. For new heat exchangers, the connection should be fixed with less allowable stress. According to the number of heat exchangers in each group, the tightening force of the heat exchangers can be adjusted one or more times. Every time the screw is tightened, the nut can be screwed in 3mm. During the tightening process, always pay attention to the stress of the adjustment part, and only allow the heat exchanger to adjust the tightening force at room temperature without working pressure. Prevent dripping.