What is the primary cause of boiler scaling?

Scaling in boilers is primarily caused by the precipitation of dissolved minerals. When water is heated in a boiler, it can no longer hold certain dissolved minerals, such as calcium and magnesium, in solution due to increased temperature and pressure. As a result, these minerals precipitate out of the water and form solid deposits on the heat transfer surfaces. This scaling can impede heat transfer, reducing efficiency and potentially leading to overheating and damage to the boiler.

Controlling the chemical composition of the feedwater and maintaining appropriate treatment can help minimize scaling. Regular blowdown processes can also assist in managing the concentration of dissolved solids in the boiler water, thus reducing the risk of scaling. Understanding this process is crucial for maintaining optimal boiler performance and longevity.