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US 9,963,754 B2Granted
Long campaign life stave coolers for circular furnaces with containment shells
OwnerAllan J. MacRaeinventor
Life of this patent
Estimating the term…
Abstract
The campaign lives are extended and the risks of process gas leaks past seals are reduced by improved stave coolers that each hang together inside steel shelled furnaces by a single neck extended out through a steel jacketed collar. All the coolant circuits inside the stave cooler are collected and grouped together to pass inside through the one collar. The steel in the collar is matched to the steel used in the containment shell, and a matching steel weld seals them together. Thermal stresses are thereby prevented from accumulating over separation distances as a consequent of the steel's coefficient of expansion. A single point of penetration has no separation distance to another.
Claims15
A liquid cooled stave cooler for smelting furnaces with steel containment shells, comprising:
- a single, copper casting of a stave body that is rectangular in shape with a top edge, a bottom edge, left and right side edges, a hot face, and a cold face, wherein such stave body is substantially taller than it is wide, and that is substantially wider than it is thick, and that is shaped with a single point of penetration and mounting to the inside of a wall of a steel containment shell of a smelting furnace;
- at least two independent circuits of coolant piping all of which are cast into the stave body as flat loops in a single layer and arranged to be uniform, parallel, and proximate to the inside of the hot face, wherein all said independent circuits of coolant piping have their respective ends collected together in a single group in the single point of penetration and mounting of the stave body;
- a single, protruding elongated neck of the single copper casting is disposed proximate to the middle of the top edge and on the cold face of the stave body to serve as the single point of penetration and mounting, and is configured to vertically support the entire weight of the liquid cooled stave cooler within the steel containment shell;
- a steel-to-steel welding collar adaptor that completely jackets the end of the protruding elongated neck, and that comprises steel, and further comprising a type of steel with a thermal coefficient of expansion that substantially matches the thermal coefficient of expansion of the type of steel of which a steel containment shell is comprised;
- and
- wherein, each end of each independent circuit of coolant piping are further all turned up together in a single group inside and through the protruding elongated neck jacketed by the steel-to-steel welding collar adaptor.
3 more elements
A liquid cooled stave cooler for smelting furnaces with steel containment shells, comprising:
- a cast iron stave body for cooling a portion of a lining inside a smelting furnace with a cylindrical steel containment shell;
- a single, protruding squared or round neck mid-laterally disposed on a cold face of the cast iron stave body configured for the whole liquid cooled stave cooler to be hung from a single matching penetration for it inside the steel containment shell;
- a squared or round steel-to-steel welding collar adaptor inside which the protruding squared or round neck is disposed, and comprising a steel having a thermal coefficient of expansion that matches the thermal coefficient of expansion of the steel of which the steel containment shell is comprised;
- and
- a least two independent circuits of coolant piping all of which are disposed as loops in a single layer, and where at least one loop is flat inside another loop, and all of which independent circuits of coolant piping are laid inside the cast iron stave body and are flat, parallel, and proximate to the inside of the hot face;
- wherein, each end of each independent circuit of coolant piping are all turned up together in a single group inside and through both the protruding neck and inside the steel-to-steel welding collar adaptor.
3 more elements
A liquid cooled stave cooler, comprising:
- a body of cast copper alloyed to balance its thermal conductivity, pipe bonding, strength, and small grain properties with an electrical conductivity of not less than 80% of International Annealed Copper Standard (IACS);
- a single protruding squared or round neck of the body of cast copper configured and positioned on a cold face of the liquid cooled stave cooler to provide substantially all of the vertical support of the liquid cooled stave cooler when hung inside from a matching penetration of a steel containment shell of a furnace;
- a squared or round steel-to-steel welding collar adapter cast into, embedded, and bonded with both the single protruding squared or round neck and a base area of the body of cast copper surrounding the single protruding squared or round neck;
- and
- a network of liquid cooling pipes disposed in a common single layer pattern within the body of cast copper between the cold face and a hot face, and having all its respective ends of pipes turned up and gathered together in a single group that pass through both the squared or round steel-to-steel welding collar adapter cast the single protruding neck for connection outside the steel containment shell.
2 more elements
Dependencies are inferred from the claim text.