What effect does increasing the supply of overfire air have on the combustion of soft coal?

Increasing the supply of overfire air during the combustion of soft coal enhances combustion efficiency. Overfire air refers to the additional air introduced above the primary combustion zone in a furnace. This air helps complete the combustion process by ensuring that any unburned volatile compounds and particulate matter are adequately combusted.

When more overfire air is supplied, it promotes better mixing of fuel and air, leading to a more thorough and even combustion process. This improvement in combustion efficiency can result in better fuel utilization, reducing unburned carbon in the ash and minimizing the formation of pollutants. Enhanced combustion efficiency is crucial in industrial settings, as it can lead to increased energy output and lower operational costs.

More than just boosting efficiency, the introduction of overfire air can also contribute to more complete burning of the coal, help break down the remaining fuel components, and ultimately support cleaner combustion. This aspect is particularly relevant when managing emissions and optimizing energy production.