Gte Sylvania Incorporated

Gte Products Corporation

Chester J Dziedzic

Joseph J Cleveland

Ray L Newman

Richard N Kleiner

Cross-flow ceramic recuperators are useful in industrial waste heat recovery in an assembly in which the ceramic recuperator is held by a metallic housing adapted for retrofitting to the metallic fittings of existing furnaces, ovens and preheaters. The housing is characterized by two pairs of opposing apertured plates held against the inlet and outlet faces of the ceramic recuperator by spring biased through-bolts.

Housing for ceramic heat recuperators and assembly

In the formation of cylindrically shaped heat regenerators from ceramic honeycomb structures for use in gas turbine engines, a gas-impervious seal of the peripheral honeycomb cells and a high strength outer ring are formed simultaneously in an apparatus which provides for surrounding the outer wall of the honeycomb structure with a castable ceramic composition suitable for forming the outer ring, contacting a peripheral area of the upper surface of the honeycomb structure defining a predetermined number of peripheral cell openings with a (different) ceramic slurry composition, evacuating the honeycomb cells whose openings are contacted with the slurry composition through corresponding openings in the lower surface of the honeycomb structure in order to promote flow of the slurry into the evacuated cells, thereby forming a gas impervious seal of these peripheral cells, while simultaneously vibrating the honeycomb structure and castable composition in order to promote flow and intimate contact of the castable composition with the outer wall of the structure, thereby to form an outer adherent layer of the castable composition on the wall of the structure. After drying, the honeycomb structure with the filled peripheral cells and the outer adherent layer of ceramic may be fired in the conventional manner to convert the structure to a unified ceramic regenerator having a sealed outer ring.

Method for forming a sealed outer ring for ceramic regenerator

Layered composite cross-flow ceramic recuperators having minimal leakage between layers and consequent high efficiencies are utilized for industrial waste heat recovery in an apparatus in which the ceramic recuperator is surrounded by a metallic housing adapted for coupling to the metallic fittings of existing furnaces, calciners, ovens and preheaters. The ceramic recuperators are formed from stacks of bi-sectioned ribbed layers, the sections of each layer being sealed together to minimize leakage of the heat transfer fluids between layers, and thus to increase the efficiency of the heat transfer.

Composite ceramic cellular structure and heat recuperative apparatus

High cell density (125 Cells/inch) cross-flow ceramic recuperators having high efficiencies are utilized for industrial waste heat recovery in an apparatus in which a ceramic recuperator core is surrounded by a metallic housing adapted for coupling to the metallic fittings of existing furnaces, ovens and preheaters. Insulating and sealing layers between the core and housing minimize heat loss through the housing and prevent leakage of the heat transfer fluids past the core.

Heat recuperative apparatus incorporating a cellular ceramic core

There is described an improved matrix structure for use in a heat regenerator for a turbine engine. The improvement comprises providing the structure's outer region with a plurality of corrugated and flat ceramic strips, a substantial portion of said strips of a thickness greater than the thickness of the structure's operative region. A method for making the structure is also disclosed.

Matrix structure and method for making

Spherical particulates containing inorganic material are produced by forming a slurry of particles in an aqueous solution of a gellable organic binder, introducing droplets of the slurry into a two-phase liquid containing an upper hydrophobic phase for forming and maintaining the droplets in spherical form, and a lower ionic phase containing divalent or trivalent metal cations for promoting gellation of the organic binder, thereby converting the slurry droplets into substantially self-supporting spheres of particles dispersed in the gelled binder. Upon separation from the two-phase liquid and one or more optional heat treatments to remove the binder, to convert precursors into the desired final inorganic form, or to strengthen or densify the spheres, such spheres are useful, for example, as starting materials for single crystal growth from a melt.

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Dushore, PA, United States of America

Chester J Dziedzic