Boiler Efficiency 3: Superheaters Reheaters and the Economizer

At the end of this course you will be able to: Explain why superheaters are used to increase the temperature of steam. Explain why a primary superheater and a secondary superheater are normally connected in series to superheat steam. Explain how a reheater affects boiler efficiency and heat rate. Explain how attemperators limit steam temperature and describe the impact that attemperators have on heat rate. Explain how the economizer affects boiler efficiency and heat rate. Describe the effects of ash buildup on superheaters reheaters and economizers and how ash buildup can be minimized. Describe the effects of too much excess air on heat transfer in superheaters reheaters and economizers and why excess air should be maintained at desired levels.