What is the primary goal of chemical dosing in a feedwater system?

The primary goal of chemical dosing in a feedwater system revolves around the prevention of scaling and corrosion. When water is heated, minerals and impurities can precipitate out, leading to scale formation on boiler tubes and other surfaces. This scaling can significantly reduce thermal efficiency and, if not managed, can result in costly damage and reduced operational lifespan of the equipment.

Additionally, many feedwater systems are made of materials that are susceptible to corrosion when in contact with certain chemicals present in the water or from external factors. By carefully controlling the chemical composition of the feedwater, operators can inhibit corrosion processes that might otherwise compromise system integrity. This includes using chemicals like phosphates, which help to bind to minerals and keep them suspended in the water, preventing them from depositing as scale.

While enhancing thermal efficiency, increasing flow rates, and cooling feedwater are important aspects of a feedwater system’s operation, they are not the primary focus of chemical dosing. The main objective is to safeguard the system against the adverse effects of scale and corrosion, ensuring reliable performance and longevity.