How to Deal with Fouling of Welded Plate Heat Exchanger?

In actual use, fouling will gradually increase on the circulating water side of the heat exchanger, so the heat exchanger should be treated for fouling after a period of use. The formation of fouling has a lot to do with water quality. Water quality varies greatly from place to place, welded plate heat exchanger applications are different in the water quality requirements are not the same, so it is difficult to determine the minimum requirements of water quality. Users can be resolved according to the actual local water quality, or find professional water treatment solutions. In the process of daily maintenance, please pay attention to the following issues.

Here is the content list:

• Insoluble in water solids

• Soluble substances in water

• Cleaning

Insoluble in water solids

If the water contains insoluble solids such as sand, weeds, leaves, and various fibers, it is easy to block pipes and heat exchangers. Fibrous debris is impossible to pass through the heat exchanger, so be sure to try to get rid of it. Particle debris can not be larger than 0.8mm, it is recommended to install a 40 to 70 purpose belt ware. However, the apparatus must be regularly maintained and cleared of debris.

Soluble substances in water

Calcium and magnesium ions in the water will precipitate and adhere to the heat exchange surface under certain conditions, forming scale and reducing heat transfer performance. The greater the concentration of calcium and magnesium ions in water, the higher the temperature of the water, and the greater the possibility of scale formation. Scale is too thick will seriously affect the heat transfer capacity of the heat exchanger, and some will even block the heat exchanger channel. Any kind of welded plate heat exchanger should not use this water directly, must be pre-treated water to reduce the content of calcium and magnesium ions in the water. When the scale is formed and then processed, it will be half the effort.

Cleaning

Depending on the application of the fully welded plate heat exchanger, different methods are available for cleaning. Cooling tower circuit condenser, its water quality is poor, available chemical cleaning, backwashing, or a combination of both to remove the dirt. If the fouling is mainly caused by sedimentation, regular on-site backwashing is the simplest and most effective option. However, if scale buildup occurs, chemical treatment is necessary. A neutral or weak acid cleaning agent can be used to clean the heat exchanger in the opposite direction at approximately twice the conventional flow rate. Circulate through the system in the opposite direction to normal use (usually 24 hours). After the system is cleaned, it should be flushed with water for at least 30 minutes.

These are some of the cleaning considerations for welded plate heat exchangers. All heat exchangers will have scale generation, but how to deal with these scales make the key to extending the life of the heat exchanger. Only with good follow-up maintenance can the service life of the heat exchanger be greatly improved. If you still have doubts about the use of heat exchangers, you can pay attention to Shanghai Jiangxing Chemical Equipment Co.Led. The company develops many kinds of heat exchangers and pays much attention to the post-maintenance of heat exchangers, and will have the answer you want in a moment.