How to deal with scaling on heat exchanger plates?
Thread Content
This post was last edited by Wang Wei2 on 2019-7-4 11:30. How to deal with scaling on heat exchanger fins? To date, the scaling problem in energy-saving plate heat exchangers that utilize geothermal energy has not been properly resolved. Many units are scrapped prematurely due to scaling and corrosion, and replacing these heat exchange equipment requires substantial funds. A new protection method should be sought to address the problems of scaling and corrosion on the metal surfaces of heat exchangers. Improve the anti-scaling and anti-rust scale capacity of the anti-corrosion coating. Avoid an increase in thermal resistance due to the formation of a scale layer, which would reduce the heat exchange efficiency of the heat exchanger. Geothermal plate heat exchangers, with plates made of titanium alloy, stainless steel, etc. The heat transfer medium is water, and the hot-side inlet consists of geothermal water at a temperature of around 90 degrees Celsius. The inlet temperature at the cold water side is around 30 degrees Celsius. Due to the complex quality of geothermal water, severe scaling occurs on the plates of the heat exchanger during its operation; in some cases, the scale accumulated over 7–8 days renders the heat exchanger ineffective, forcing a shutdown for maintenance and scale removal. Let’s see if there are any good ways to solve this problem
This is a device for purification, right? It uses anion and cation electrolysis to adsorb ions such as calcium and magnesium, thereby softening the water quality. The device patent and materials are likely from abroad.
It’s also rows of plates that can be pulled out for cleaning and then put back in.
Currently, the scale must be removed every 3 to 4 days, resulting in low equipment efficiency.
If it’s a closed-loop system, I have scale inhibitors here that work very well; you might want to give them a try.
It is recommended to change the water quality and add more filtration and adsorption equipment, rather than trying to clean the heat exchanger; no heat exchanger can withstand such a rapid rate of scaling
It is heated using geothermal water as a heat medium.
The pipe outlet can be coated; a super-smooth coating can prevent scaling. However, the coating on the plates has little impact on heat transfer efficiency.
This problem can be solved by using a coating with a thermal conductivity comparable to that of metal.
This type of plate heat exchanger has relatively high requirements regarding water quality; cleaning it is done using high-pressure water guns. The rapid buildup of scale, along with the need to use filters, is both time-consuming and costly. Additionally, filter devices should be installed on the inlet pipelines for both the hot and cold media. It is recommended to improve the quality of the water, consider using chemicals, and carrying out water replacement procedures.