Modular catalytic combustion bed support system

Details Modular catalytic combustion bed support system Modular catalytic combustion bed support system

1981-08-06

1984-02-21

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combustion products generator

60753, 60760, F03B 0000

Patent

active

044322070

ABSTRACT:
A modular catalytic combustor for a gas turbine has a plurality of individual, non-metallic cylindrical catalyst beds, and a support structure for each of the individual catalyst beds. Each catalyst bed together with its support structure forms an individual catalyst module. Each support structure includes an outer cooled support cylinder, with the individual support cylinders of the various modules interconnected in spaced relationship with cooling air passageways between. There are means for supplying compressed air, such as from a gas turbine compressor, into the space surrounding the support cylinders. The outer cooled support cylinders are provided with apertures for entry of cooling and purge air from the surrounding space. Each of the catalyst beds has an integral, cylindrical, outer ceramic shell, and is positioned within a corresponding outer support cylinder. A sheet metal heat shield is interposed between and concentric with each of the outer support cylinders and the catalyst bed within. The heat shield is mounted and configured so as to provide passageways for cooling and purge air such that a limited amount of cooling and purge air enters through the apertures and flows generally along the outer surface of the heat shield in one axial direction, around an end of the heat shield, and then in the opposite axial direction along the inner surface of the heat shield to exit into the main stream of gas flowing through the combustor. As a result, fuel-air mixture is prevented from entering the annular space just outside the catalyst beds, and cooling of the metal structure is provided without undue cooling of the outer ceramic shell.

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