Which method can be adjusted to control the furnace temperature and burning rates of an incinerator?

The ability to control furnace temperature and burning rates in an incinerator is critical for effective waste management and environmental compliance. Each of the methods mentioned plays a significant role in this process.

Adjusting the amount of overfire air allows for better combustion efficiency by promoting complete fuel burn and controlling the temperature in the combustion chamber. By tilting the air distribution towards overfire air, operators can maximize the availability of oxygen at different heights in the furnace, which directly impacts temperature and combustion quality.

The amount of underfire air also contributes significantly to combustion rates. Underfire air is introduced at the bottom of the incinerator, promoting the initial combustion of waste materials. By manipulating this air supply, it is possible to control the fire dynamics, thereby affecting both the burning rate and the furnace temperature.

Using the forced draft fan is another mechanism to influence the combustion process. This fan provides the necessary airflow to support combustion. By adjusting the fan speed, air supply to the combustion process can be increased or decreased, thus affecting both temperature and burning rate.

Since all three methods—overfire air, underfire air, and the forced draft fan—are integral to managing the incinerator's combustion environment, the correct answer is comprehensive as it encompasses all these controls