Where is a radiant superheater typically located?

A radiant superheater is specifically designed to absorb radiant heat from the combustion process occurring within the furnace of a boiler. Located within this area, the radiant superheater's primary function is to increase the temperature of the steam produced, thereby enhancing its energy content before it travels onward to the turbine or different parts of the power cycle.

Positioning it in the furnace area allows for optimal heat absorption where the temperatures are highest, ensuring efficient conversion of heat to steam. The other options don't align with the correct operational principles of a radiant superheater. For instance, the economizer is primarily involved in heating feedwater, the steam drum is mainly for steam and water separation, and heat exchangers serve different thermal management roles within the overall system.