Liquid heaters and vaporizers – Supports
Reissue Patent
1999-11-30
2001-05-29
Ferensic, Denise L. (Department: 3749)
Liquid heaters and vaporizers
Supports
C122S511000
Reissue Patent
active
RE037192
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is generally related to industrial furnaces and particularly to the floor tube supports in such furnaces.
2. General Background
In industrial furnaces such as those used by utilities, heat exchange tubes which form the walls and floor carry a liquid that serves as a heat exchange medium. The tubes must be protected from cracking or crushing in order to operate efficiently. Slag particles carried in the hot furnace gases collect on the exposed surfaces in the upper furnace and, eventually, fall onto the floor tubes of the furnace. Even though furnace floors generally are sloped to shed slag and other deposits, the impact and weight of the slag has damaged or crushed the floor tubes in certain furnaces. Such furnaces have the problem of having rigid mountings for the floor tubes that force the tubes to absorb the impact and weight of the slag. This leads to support truss and tube damage, reduced operating efficiency, and the need for outages to make repairs and install new materials which also will be subject to damage. This results in a need in such furnaces for floor tube mountings that will prevent damage to the floor tubes and support trusses by absorbing the impact and weight of falling slag and that are replaceable at less cost than that of the heat exchange tubes.
SUMMARY OF THE INVENTION
The invention addresses the above need. What is provided is a deformable and replaceable energy absorbing structure between the furnace floor tubes and the floor tube supporting truss. When necessary to provide for greater distribution of the load over the supporting structure, additional vertical trusses may be added and the number of contact points between the vertical trusses and tube panels may be increased. A beam, such as an I-beam, extends from the supporting structure and is adapted to hold a deformable structure. A tie bar attached to the floor tube panel extends across the panel and rests upon the deformable structure. This arrangement is provided at as many contact points between the floor tube panel and support structure as necessary to support the dead weight of the tubes while still providing suitable energy absorption characteristics.
REFERENCES:
patent: 4917172 (1990-04-01), Falduti
patent: 5136985 (1992-08-01), Krowech
patent: 5207184 (1993-05-01), Kreider
patent: 5282442 (1994-02-01), Payne
patent: 5449037 (1995-09-01), Welkey
Detzel Roger Alan
Harth, III George Henry
Shiffer Dennis Robert
Wewer Robert Wayne
Ferensic Denise L.
Lu Jiping
McDermott Technology Inc.
Rader & Fishman & Grauer, PLLC
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