Steam Boiler Parts And Their Functions [caption id="attachment_2595" align="alignleft" width="300"] Maker Shell Boilers[/caption] The main components of the boiler consist of furnace, membrane walls, boiler shell, economizer, cyclone, water storage tank, deaerator, coal bunker, hopper, conveyor and chimney. The following will be discussed one by one: 1. Furnace Furnace or also o...