A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

A sidewall suitable for use in a metallurgical furnace is provided. The sidewall has an upper wall, and an outer wall is coupled to the upper wall and extends downward from the upper wall. An inner wall is coupled to the upper wall and extends downward from the upper wall. The inner wall has an inner surface facing and circumscribed by the outer wall. A bottom wall is coupled to the inner wall. The bottom wall has a bottom extension wall extending away from the inner wall. A liner wall is attached to the bottom extension wall and extends upward in a spaced apart relationship to the inner wall. A spray cooling assembly is disposed between the inner wall and the outer wall. The spray cooling assembly is configured to spray coolant on the inner surface of the inner wall.

A sidewall suitable for use in a metallurgical furnace is provided. The sidewall has an upper wall, and an outer wall is coupled to the upper wall and extends downward from the upper wall. An inner wall is coupled to the upper wall and extends downward from the upper wall. The inner wall has an inner surface facing and circumscribed by the outer wall. A bottom wall is coupled to the inner wall. The bottom wall has a bottom extension wall extending away from the inner wall. A liner wall is attached to the bottom extension wall and extends upward in a spaced apart relationship to the inner wall. A spray cooling assembly is disposed between the inner wall and the outer wall. The spray cooling assembly is configured to spray coolant on the inner surface of the inner wall.

A spray cooling system having a cleanout trap for use in a sidewall or roof of a metallurgical furnace is disclosed herein. The spray cooling system has a header fluidly coupled to a coolant source, a spray conduit fluidly coupled to the header for receiving coolant flowing from the header and one or more nozzles fluidly coupled to spray conduits. The nozzles are configured to receive coolant from the spray conduit and spray, mist or otherwise direct the coolant from spray conduit onto a surface of the sidewall or roof for cooling. The spray cooing system has a cleanout trap fluidly coupled thereto. The cleanout trap is configured to remove particulate from the coolant flowing through the cleanout trap prior to the coolant flowing through the nozzles.

A spray cooling system having a cleanout trap for use in a sidewall or roof of a metallurgical furnace is disclosed herein. The spray cooling system has a header fluidly coupled to a coolant source, a spray conduit fluidly coupled to the header for receiving coolant flowing from the header and one or more nozzles fluidly coupled to spray conduits. The nozzles are configured to receive coolant from the spray conduit and spray, mist or otherwise direct the coolant from spray conduit onto a surface of the sidewall or roof for cooling. The spray cooing system has a cleanout trap fluidly coupled thereto. The cleanout trap is configured to remove particulate from the coolant flowing through the cleanout trap prior to the coolant flowing through the nozzles.