What role does a coal feeder play in a boiler?

A coal feeder is a crucial component in a boiler system primarily responsible for supplying coal to the combustion chamber at a controlled rate. This controlled feed ensures that there is a consistent and optimized amount of fuel available for combustion, which is essential for maintaining efficient operation and achieving desired output levels in the boiler. By regulating the quantity of coal introduced into the system, the coal feeder helps in balancing the fuel-air mixture, supporting complete combustion, and minimizing the production of pollutants.

The other functions mentioned, such as removing excess coal or monitoring air quality, do not align with the primary purpose of a coal feeder. The feeder’s main job is not to increase water temperature, as that is a function of the boiler's heating elements and steam generation process. Thus, the role of the coal feeder in maintaining an efficient and safe boiler operation is highlighted in its ability to control the fuel supply effectively.