Which type of stoker requires an ignition arch for proper operation?

The requirement of an ignition arch is specifically associated with a chain grate stoker. This type of stoker employs a moving chain that transports fuel through the combustion chamber while maintaining a consistent flow. As the fuel moves along, it needs an ignition source to ensure efficient and complete combustion. The ignition arch provides the necessary heat to ignite the fuel as it enters the combustion zone, facilitating proper operation.

In the context of other stoker types, they operate differently. A moving grate stoker, while also utilizing a grate for combustion, typically employs an alternation of fuel movement and airflow without needing a specific ignition arch. Similarly, fluidized bed stokers use a different approach, where fuel is suspended in air, creating a fluid-like state that promotes rapid combustion, thus negating the need for an ignition arch. Vertical stokers do not rely on the same mechanisms, thus also avoiding this requirement.

Understanding the function of the ignition arch in relation to combustion efficiency and the unique operational characteristics of these stoker types highlights why the chain grate stoker specifically necessitates this component for optimal performance.