| dry-steam drum [¦drī ´stēm `drǝm] MECHANICAL ENGINEERING 1. Pressurized chamber into which steam flows from the steam space of a boiler drum. 2. That portion of a two-stage furnace that extends forward of the main combustion chamber; fuel is dried and gasified therein, with combustion of gaseous products accomplished in the main chamber; the refractory walls of the Dutch oven are sometimes water- cooled. |