System for arranging an emission reducing catalyst in an exhaust duct of a gas turbine engine

Abstract

An exhaust section for a gas turbine power plant including: an exhaust duct in fluid communication with exhaust gas from a gas turbine engine, wherein the exhaust gas flows through the exhaust duct along a flow direction; a catalyst supporting platform spanning a flow passage in the exhaust duct such that the exhaust gas passes through the platform, wherein the platform includes apertures having catalyst coated surfaces and the catalyst supporting platform has a front face which is no perpendicular to the flow direction.

What is claimed is: 
     
         1 . An exhaust section for a gas turbine power plant, comprising:
 an exhaust duct in fluid communication with exhaust gas from a gas turbine engine, wherein the exhaust gas flows through the exhaust duct along a flow direction;   a catalyst supporting platform spanning a flow passage in the exhaust duct such that the exhaust gas passes through the platform, wherein the platform includes apertures having catalyst coated surfaces and the catalyst supporting platform has a front face which, at least in part, is not perpendicular to the flow direction.   
     
     
         2 . The exhaust section for a gas turbine power plant according to  claim 1 , wherein the catalyst supporting platform is substantially a conical shape with a cone axis parallel to the flow direction. 
     
     
         3 . The exhaust section for a gas turbine power plant according to  claim 2  wherein the conical shape has a V-cross section which converges in the flow direction. 
     
     
         4 . The exhaust section for a gas turbine power plant according to  claim 1  wherein a plurality of the apertures have axes oriented in a range of ten to ninety degrees with respect to the flow direction. 
     
     
         5 . The exhaust section for a gas turbine power plant according to  claim 1 , wherein the catalyst supporting platform is oriented in a plane at an angle with respect to the flow direction in a range of ten to ninety degrees. 
     
     
         6 . The exhaust section for a gas turbine power plant according to  claim 1 , wherein the catalyst supporting platform includes steps. 
     
     
         7 . The exhaust section for a gas turbine power plant according to  claim 6 , wherein each step includes a riser in a plane substantially perpendicular to the flow direction and a tread in a plane substantially parallel to the flow direction. 
     
     
         8 . The exhaust section for a gas turbine power plant according to  claim 1 , wherein the catalyst coated surfaces include an oxidation or reduction agent coating. 
     
     
         9 . An exhaust section for a gas turbine power plant comprising:
 a transition duct;   an exhaust duct;   an exhaust exit stack;   a porous catalyst supporting platform within the exhaust duct or exhaust exit stack, wherein the catalyst supporting platform extends across an exhaust air flow passage such that the exhaust air from a gas turbine engine flows through platform; and the catalyst supporting platform is arranged such that the exhaust air flow passes through catalyst coated apertures in the platform at angles to the direction of the exhaust air flow in a range of ten to ninety degrees.   
     
     
         10 . The exhaust section for a gas turbine power plant according to  claim 9 , wherein the catalyst supporting platform is substantially a conical shape with a cone axis parallel to the flow direction. 
     
     
         11 . The exhaust section for a gas turbine power plant according to  claim 10  wherein the conical shape has a V-cross section which converges in the flow direction. 
     
     
         12 . The exhaust section for a gas turbine power plant according to  claim 9  wherein a plurality of the apertures have axes oriented in a range of ten to ninety degrees with respect to the flow direction. 
     
     
         13 . The exhaust section for a gas turbine power plant according to  claim 9 , wherein the catalyst supporting platform is oriented in a plane at an angle with respect to the flow direction in a range of ten to ninety degrees. 
     
     
         14 . The exhaust section for a gas turbine power plant according to  claim 9 , wherein the catalyst supporting platform includes steps. 
     
     
         15 . The exhaust section for a gas turbine power plant according to  claim 14 , wherein each step includes a riser in a plane substantially perpendicular to the flow direction and a tread in a plane substantially parallel to the flow direction. 
     
     
         16 . The exhaust section for a gas turbine power plant according to  claim 9 , wherein the catalyst coated surfaces include an oxidation or reduction agent coating.