What condition is necessary for the combustion of fuel in a boiler furnace?

For combustion to occur efficiently in a boiler furnace, it is essential to have a sufficient amount of excess air. Excess air is necessary because it ensures that there is adequate oxygen available for the complete combustion of the fuel. When fuel burns, it needs oxygen to react with, and without enough air, incomplete combustion can occur, leading to the production of carbon monoxide and other pollutants, along with reduced efficiency.

Moreover, having excess air helps to maintain complete combustion even if there are fluctuations in fuel quality or varying combustion conditions. Ensuring that the right amount of air is present enhances the efficiency of the process and minimizes the chances of harmful emissions, contributing to better environmental standards and operational safety in the boiler furnace.