Bent tube waste heat steam generator and method

Details Bent tube waste heat steam generator and method Bent tube waste heat steam generator and method

1988-02-16

1989-03-14

Favors, Edward G.

Liquid heaters and vaporizers

Miscellaneous

122235D, 122367C, 16510415, F22B 100

Patent

active

048116963

ABSTRACT:
A bent tube waste heat steam generator for use in a catalytic regenerator, and method of use. The regenerator has an outer shell and has a level of catalysts therein. A steam generator is in operative association with the regenerator and includes a riser, downcomer and steam drum positioned externally of the shell and a heat exchanger positioned within the shell. The heat exchanger includes a substantially horizonal lower manifold connected to the downcomer and a substantially horizontal upper manifold connected to the riser. A plurality of substantially C-shaped, bent tubes interconnect the upper and lower manifolds. The upper manifold is above the catalyst level, and the lower manifold is below the catalyst level. Each tube has a lower portion connected to the lower manifold and extending angularly upwardly therefrom, an upper portion connected to the upper manifold and extending angularly downwardly therefrom, and an intermediate portion interconnecting the upper and lower portions. Preferably, the lower, upper and intermediate portions are coplanar. A bank of substantially coplanar tubes are nested together, and a plurality of such banks of tubes are spaced longitudinally with respect to the upper and lower manifolds. Vertically oriented fins may be positioned on the intermediate portions of the tubes, and shielding may be positioned above the upper and lower manifolds. Also, insulation may be placed on the external surface of the upper and lower manifolds.

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