초록 ▼

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 i

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.

대표청구항 ▼

A support structure for a cylindrical ceramic catalyst bed for use with a gas turbine combustor, comprising: an outer cooled support cylinder; said outer cooled support cylinder including apertures therethrough effective for permitting entry of compressed air from a surrounding space; a cylindrical

A support structure for a cylindrical ceramic catalyst bed for use with a gas turbine combustor, comprising: an outer cooled support cylinder; said outer cooled support cylinder including apertures therethrough effective for permitting entry of compressed air from a surrounding space; a cylindrical outer ceramic shell concentric within said outer support cylinder and spaced therefrom to form an annular space therebetween; a sheet meal heat shield in said annular space interposed between and concentric with said outer cooled support cylinder and said cylindrical outer ceramic shell, said heat shield being effective to form a first passageway for permitting air entering through said apertures to flow generally along an outer surface of said heat shield in a first axial direction, apertures for permitting said air to flow around an end of said heat shield, and a second passageway for permitting said air to flow in a second opposite axial direction along an inner surface of said heat shield and apertures to permit said air to exit into a main stream of gas flowing through said combustor, whereby entry of a fuel-air mixture into said annular space is prevented and said support cylinder and said heat shield are cooled without unduly cooling said outer ceramic shell.