After Sale Maintenance Service / Acid Wash Service For Plate Heat Exchanger

During long-term use, plate heat exchangers are prone to scaling on the surface of the plates due to factors such as water quality and medium, which affects heat transfer efficiency. Therefore, regular acid washing is necessary. Below, we will provide a detailed introduction to the method of pickling plate heat exchangers and the precautions to be taken.

1, Method of pickling plate heat exchanger

①　Preparation work: Firstly, it is necessary to close the inlet and outlet valves of the heat exchanger and drain the internal medium. Next, remove the end cover of the heat exchanger to expose the plates.

②　Preparation of acid pickling solution: Select the appropriate acid pickling agent based on the material of the plate and the composition of the scale layer, and mix it with water in a certain proportion to prepare the acid pickling solution.

③　Acid washing process: Inject the prepared acid washing solution into the heat exchanger to ensure that all plates are fully immersed in the solution. Determine the soaking time based on the thickness and composition of the scale layer. During the pickling process, it is necessary to regularly check the pickling effect to prevent excessive pickling from causing corrosion to the plates.

④　Flushing and Inspection: After acid washing is completed, rinse the inside of the heat exchanger repeatedly with clean water to ensure that all acid washing solution and scale residue are completely removed. Then, inspect the board to confirm that there is no damage or corrosion.

2, Precautions for Pickled Plate Heat Exchanger

①　Safety protection: When performing acid washing operations, it is necessary to wear protective equipment such as acid and alkali resistant gloves, protective goggles, etc. At the same time, it is necessary to ensure good ventilation in the operating environment to avoid the volatilization of acid pickling solution from causing harm to the human body.

②　Pickling agent selection: Different pickling agents have different effects on different scale layers, so the appropriate pickling agent should be selected according to the actual situation. In addition, attention should be paid to the concentration and usage temperature of the acid detergent to avoid corrosion of the board.

③　Control the pickling time: The pickling time should not be too long, otherwise it will cause damage to the plate. Regular inspections should be conducted during the pickling process, and once the scale layer is removed, pickling should be stopped immediately.

④　Thoroughly rinse: After acid washing is completed, ensure that the interior of the heat exchanger is thoroughly rinsed to prevent residual acid pickling agents from affecting subsequent use.

In short, acid washed plate heat exchangers are important measures to maintain their normal operation and extend their service life. By mastering the correct pickling method and precautions, the scale layer can be effectively removed, heat transfer efficiency can be improved, and the stable operation of plate heat exchangers can be ensured.