Spray-cooled furnace roof with gravity drain

A metallurgical furnace comprising:

• a tilt platform;
• a gantry crane attached to the tilt platform, the gantry crane having arms;
• a furnace body disposed on the tilt platform, the furnace body comprising:
• a sidewall, the sidewall having a top disposed opposite a bottom, wherein the sidewall surrounds an interior portion of the furnace body;
• a roof disposed on the top of the sidewall, the roof comprising:
• a body comprising:
• a top surface having a center opening;
• a bottom surface opposite the top surface;
• and
• an outer sidewall connecting the top surface to the bottom surface, the outer sidewall, the bottom surface and the top surface defining an interior portion, wherein the outer sidewall has a lift side and a hood side;
• an internal spray cooling system disposed in the interior portion of the body;
• and
• a drain system integral with the body, the drain system comprising:
• a roof evacuation conduit disposed outside the interior portion and configured to collect spay coolant from the interior portion of the body;
• and
• a drain box having a vent and an exit pipe, wherein the drain box is at atmospheric pressure and the roof evacuation conduit channels spent coolant into the drain box which is sloped to the exit pipe for drainage.

A method of evacuating spent coolant from a spray cooled roof of a metallurgical furnace, comprising:

• spraying coolant in an internal volume of a roof,
• gravity feeding the coolant into a roof drain disposed along an outer wall of the roof;
• spraying coolant in an internal volume of an elbow vent for the roof,
• gravity feeding the coolant into an elbow drain disposed along an outer wall of the roof;
• channeling the elbow drain and the roof drain into a drain box wherein an outlet of the elbow drain is disposed above an outlet of the roof drain;
• and
• draining the drain box of spent coolant by gravity out an exit pipe.