What is the primary purpose of continuous blowdown in a boiler system?

The primary purpose of continuous blowdown in a boiler system is to control total dissolved solids (TDS). In a boiler, water is heated to generate steam, and as water evaporates, it leaves behind impurities that accumulate and can lead to scaling, corrosion, and overall system inefficiency if not managed. Continuous blowdown helps to remove a portion of the concentrated water from the boiler, thereby keeping the concentration of TDS within acceptable levels.

By regularly discharging a controlled amount of water, the system ensures that TDS concentrations do not reach harmful levels, which can affect the boiler's operation and longevity. This not only helps maintain the quality of the steam produced but also protects the equipment from damage and the need for more extensive maintenance.

Other options, while relevant to boiler operation, do not specifically capture the main goal of continuous blowdown as effectively as controlling TDS does.