Patent ID: 7621237

Claim:
A multi-pass upflow economizer for a HRSG, comprising: an array of heat transfer panels arranged in adjacent relationship; each panel of said array comprising an upper manifold and a lower manifold positioned beneath said upper manifold; an array of tubes connecting said upper manifold to said lower manifold of each respective panel, wherein said array of tubes extend in a perpendicular, vertical direction between said upper manifold and said lower manifold thereby providing flow in a vertically upward direction only; a respective jumper pipe connecting the upper manifold of each respective panel of said array of heat transfer panels to respective lower manifold of an adjacent panel thereby recircuiting the total volume of flow between each heat transfer panel so that the flow in each of the tubes is upflow; an economizer outlet connected to the upper manifold of one of the said array of panels; and an economizer inlet connected to the lower manifold of one of said array of panels.