What is the purpose of boiler blowdown?

The primary purpose of boiler blowdown is to remove sediment and contaminants from the boiler water. Over time, dissolved solids, sludge, and other impurities can accumulate in the boiler due to the evaporation of water and the addition of feedwater. If these contaminants are not periodically removed, they can lead to several issues, including:

1. Corrosion and Scaling: Accumulated sediments can cause scaling on heat exchange surfaces, leading to reduced heat transfer efficiency and increased fuel consumption. This scaling can also contribute to corrosion, which can damage the boiler over time.

2. Water Quality Maintenance: Blowdown helps maintain the chemical balance and system integrity of the boiler water. It aids in keeping the total dissolved solids (TDS) within recommended limits, ensuring safe and efficient operation.

3. Operational Efficiency: By controlling TDS levels through regular blowdown operations, the boiler can operate more efficiently, reducing the need for maintenance and enhancing the lifespan of the system.

As for the other options, while blowdown may indirectly influence pressure or fuel efficiency, those are not its primary functions. Furthermore, stabilizing water levels in the boiler is typically managed through feedwater systems, not blowdown processes. Thus, removing contaminants and sediments from the boiler