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RESEARCH PAPERS

Flow and Heat Transfer in Heat Recovery Steam Generators

[+] Author and Article Information
N. Hegde, I. Han, T. W. Lee, R. P. Roy

Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287-6106

One basis for this was a series of velocity measurements carried out in a 112 scale model of a vertical-tube HRSG of a California plant. Further details cannot be provided due to the proprietary nature of the measurements.

The locations of these tube-banks are shown schematically in Fig. 2.

J. Energy Resour. Technol 129(3), 232-242 (Mar 24, 2007) (11 pages) doi:10.1115/1.2751505 History: Received September 08, 2006; Revised March 24, 2007

Computational simulations of flow and heat transfer in heat recovery steam generators (HRSGs) of vertical- and horizontal-tube designs are reported. The main objective of the work was to obtain simple modifications of their internal configuration that render the flow of combustion gas more spatially uniform. The computational method was validated by comparing some of the simulation results for a scaled-down laboratory model with experimental measurements in the same. Simulations were then carried out for two plant HRSGs—without and with the proposed modifications. The results show significantly more uniform combustion gas flow in the modified configurations. Heat transfer calculations were performed for one superheater section of the vertical-tube HRSG to determine the effect of the configuration modification on heat transfer from the combustion gas to the steam flowing in the superheater tubes.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of horizontal-tube HRSG

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Figure 2

Schematic of vertical-tube HRSG

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Figure 3

Schematic of horizontal-tube HRSG laboratory model

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Figure 4

Superheater, evaporator, and economizer sections of the laboratory model

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Figure 5

Comparison of visualized velocity field in the laboratory model with CFD result—without 2∕3-width perforated plate

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Figure 6

Comparison of visualized velocity field in the laboratory model with CFD result—with 2∕3-width perforated plate

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Figure 7

Velocity measurement (LDV) planes in the laboratory model

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Figure 8

Streamwise velocity components at planes 1, 2, 4, and 5 shown in Fig. 7—without 2∕3-width perforated plate

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Figure 9

Velocity vectors for horizontal-tube HRSG—present configuration

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Figure 10

Velocity vectors for horizontal-tube HRSG—modified configuration

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Figure 11

Comparison of streamwise velocity component upstream of the superheater, evaporator, and economizer sections—present and modified configurations

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Figure 12

Velocity vectors for vertical-tube HRSG—present configuration

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Figure 13

Velocity vectors for vertical-tube HRSG—modified configuration

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Figure 14

Planes for comparison of computed velocity profiles in the vertical-tube HRSG

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Figure 15

Streamwise velocity profile at plane 1-1

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Figure 16

Streamwise velocity profile at plane 2-2

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Figure 17

Streamwise velocity profile at plane 3-3

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Figure 18

Transverse velocity profile at plane 1-1

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Figure 19

Transverse velocity profile at plane 2-2

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Figure 20

Transverse velocity profile at plane 3-3

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Figure 21

Comparison of pressure at the inlet plane—vertical-tube HRSG

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Figure 22

HPSH1 tube-bank

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Figure 23

HPSH1 tube-bank—“unit cell” for heat transfer simulation

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Figure 24

Comparison of exhaust gas temperature profile at HPSH1 outlet plane

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Figure 25

Comparison of steam temperature along HPSH1 tubes—tube rows 1, 2, and 3

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