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US 8,574,488 B2Granted
Furnace refractory brick hearth tap hole
OwnerAllan MacRaeinventor
Life of this patent
Estimating the term…
Abstract
A method for accommodating increasing outward pressures in the tap holes of a hearth furnace includes configuring a tap hole lining and disposing it inside a hollow cylindrical conduit such that the tap hole lining can slide in response to outward pressures and growth in the hearth brick. The tap hole lining is retained inside the hollow cylindrical conduit with a retaining ring and spring assemblies.
Claims7
An improved tap hole for a downwardly dished hearth brick in a compressed brick furnace hearth with a cylindrical base shell, the improvement comprising:
- a hollow conduit radially attached to the outside of a furnace base shell and peripheral to a downwardly dished hearth brick, and concentric to a horizontally disposed tap hole;
- a tap hole brick lining through which the tap hole is longitudinally and centrally disposed, and configured to fit inside the conduit and able to outwardly slide bit-by-bit in the hearth brick during the campaign life of the furnace to compensate for incremental growth;
- wherein, excess pressures that would otherwise develop incrementally over time around the tap hole are relieved.
An elastically interconnected cooler compressed hearth and walls, comprising:
- one or more tiers of wall-cooling blocks shaped into arc segments and having flanges configured to be joined together to form complete sets of tiered rings;
- a plurality of spring-bolt assemblies installed on said flanges and at the joints between individual wall-cooling blocks, and configured to close the spaces that develop between;
- an outer perimeter of refractory and/or hearth brick within said tiered rings configured to be inwardly compressed by spring pressure toward the center to disallow any leaks from forming between separate bricks;
- and
- a tap hole comprising:
- a hollow conduit radially attached to the outside of a furnace base shell and peripheral to a hearth brick, and concentric to a horizontally disposed tap hole;
- and
- a tap hole brick lining through which the tap hole is longitudinally and centrally disposed, and configured to fit inside the conduit and able to outwardly slide in the hearth brick bit-by-bit during the campaign life of the furnace to compensate for incremental growth;
- wherein, excess pressures that would otherwise develop incrementally over time around the tap hole are relieved.
6 more elements
Dependencies are inferred from the claim text.