Heat Recovery Steam Generator Boiler Tube Arrangement

Abstract

A heat recovery steam generator includes a casing having an inlet and an outlet, a boiler tube disposed in the casing, the boiler tube defining an inner cavity and an outer surface, the boiler tube having a cross-sectional shape with a longitudinal axis and a transverse axis, wherein a length of the longitudinal axis is greater than a length of the transverse axis, and at least one fin arranged on the outer surface of the boiler tube.

1 . A heat recovery steam generator comprising:
 a casing having an inlet and an outlet;   a boiler tube disposed in the casing, the boiler tube defining an inner cavity and an outer surface, the boiler tube having a cross-sectional shape with a longitudinal axis and a transverse axis, wherein a length of the longitudinal axis is greater than a length of the transverse axis; and   at least one fin arranged on the outer surface of the boiler tube.   
     
     
         2 . The heat recovery steam generator of  claim 1 , wherein the cross-sectional shape of the boiler tube is elliptical. 
     
     
         3 . The heat recovery steam generator of  claim 2 , wherein the at least one fin is elliptically shaped. 
     
     
         4 . The heat recovery steam generator of  claim 1 , wherein the cross-sectional shape of the boiler tube includes a first longitudinal segment and a second longitudinal segment, the first longitudinal segment arranged in parallel to the second longitudinal segment. 
     
     
         5 . The heat recovery steam generator of  claim 4 , wherein the cross-sectional shape of the boiler tube further includes a first radially shaped transverse segment and a second radially shaped transverse segment. 
     
     
         6 . The heat recovery steam generator of  claim 1 , wherein the at least one fin includes a planar surface. 
     
     
         7 . The heat recovery steam generator of  claim 6 , wherein the planar surface of the at least one fin is arranged in parallel with a planar surface of a second fin. 
     
     
         8 . The heat recovery steam generator of  claim 1 , wherein the inlet is connected to an exhaust duct of a gas turbine engine. 
     
     
         9 . A power system comprising:
 a gas turbine engine having an exhaust duct; and   a heat recovery steam generator comprising:   a casing having an inlet connected to the exhaust duct and an outlet;   a boiler tube disposed in the casing, the boiler tube defining an inner cavity and an outer surface, the boiler tube having a cross-sectional shape with a longitudinal axis and a transverse axis, wherein a length of the longitudinal axis is greater than a length of the transverse axis; and   at least one fin arranged on the outer surface of the boiler tube.   
     
     
         10 . The system of  claim 9 , wherein the cross-sectional shape of the boiler tube is elliptical. 
     
     
         11 . The system of  claim 10 , wherein the at least one fin is elliptically shaped. 
     
     
         12 . The system of  claim 9 , wherein the cross-sectional shape of the boiler tube includes a first longitudinal segment and a second longitudinal segment, the first longitudinal segment arranged in parallel to the second longitudinal segment. 
     
     
         13 . The system of  claim 12 , wherein the cross-sectional shape of the boiler tube further includes a first radially shaped transverse segment and a second radially shaped transverse segment. 
     
     
         14 . The system of  claim 9 , wherein the at least one fin includes a planar surface. 
     
     
         15 . The system of  claim 14 , wherein the planar surface of the at least one fin is arranged in parallel with a planar surface of a second fin. 
     
     
         16 . A boiler tube assembly comprising:
 a tube disposed in the casing, the tube defining an inner cavity and an outer surface, the tube having a cross-sectional shape with a longitudinal axis and a transverse axis, wherein a length of the longitudinal axis is greater than a length of the transverse axis; and   at least one fin arranged on the outer surface of the tube.   
     
     
         17 . The assembly of  claim 16 , wherein the cross-sectional shape of the tube is elliptical. 
     
     
         18 . The assembly of  claim 17 , wherein the at least one fin is elliptically shaped. 
     
     
         19 . The assembly of  claim 16 , wherein the cross-sectional shape of the tube includes a first longitudinal segment and a second longitudinal segment, the first longitudinal segment arranged in parallel to the second longitudinal segment. 
     
     
         20 . The assembly of  claim 19 , wherein the cross-sectional shape of the tube further includes a first radially shaped transverse segment and a second radially shaped transverse segment.