DONALD SANSOUCY
Engineering in Providence, RI

5722354, Mar 3, 1998

Dec 8, 1995

8/569285

Donald M. Sansoucy - Providence RI

DB Riley, Inc. - Worcester MN

F22B 3724

122510

A new and improved heat recovery steam generating apparatus for extracting heat from a hot gas stream, comprises a vertically extending tube bank having upper and lower headers at opposite ends. Two pairs of external, gravity force, support columns are spaced upstream and downstream of the tube bank and a top support structure is mounted at the upper end of the columns for supporting the tube bank in downwardly hanging relation from the upper header. A pair of permanent internal trusses are supportively connected at the upper end to the columns and each truss has opposite edges slidably supported from a pair of columns for accommodating expansion and contraction of the tubes and for transferring and resisting lateral and shear loads, which loads are eventually transferred to a bottom structure at the lower end of the columns. Tube spacing elements are provided at several different levels at oppositely spaced apart intervals and the sheets are supported on side members extending between the trusses for maintaining alignment of the tubes and for transferring lateral loads to the trusses. The trusses are useful in preventing damage and distortion of the tube bank during transport and erection, and then become a permanent part of the HRSG structure when erection is completed.