What does the term "draft" refer to in boiler operations?

In boiler operations, the term "draft" specifically refers to the pressure difference created to facilitate the movement of air and flue gases through the system. This pressure differential is crucial for ensuring that combustion air flows into the boiler and exhaust gases are effectively expelled.

A proper draft is essential for maintaining efficient combustion, as it influences the mixing of air and fuel, the removal of combustion by-products, and the overall efficiency of the boiler. The draft can be influenced by various factors, including the design of the chimney, the temperature of the flue gases, and environmental conditions.

Inadequate draft can lead to poor combustion, increased emissions, and operational issues, while excessive draft can cause operational inefficiencies and increased fuel consumption. Therefore, understanding and managing draft is vital for optimal boiler performance and safety.