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TECHNICAL PAPERS: Gas Turbines: Industrial & Cogeneration

Flow Stability of Heat Recovery Steam Generators

[+] Author and Article Information
Heimo Walter

Institute for Thermodynamics and Energy Conversion, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austriah.walter@tuwien.ac.at

Wladimir Linzer

Institute for Thermodynamics and Energy Conversion, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria

The program “Dynamic Boiler Simulation” (DBS ) was developed at the Vienna University of Technology, Institute for Thermodynamics and Energy Conversion.

J. Eng. Gas Turbines Power 128(4), 840-848 (Mar 01, 2004) (9 pages) doi:10.1115/1.2179469 History: Received October 01, 2003; Revised March 01, 2004

This paper presents the results of theoretical flow stability analyses of two different types of natural circulation heat recovery steam generators (HRSG)—a two-drum steam generator—and a HRSG with a horizontal tube bank. The investigation shows the influence of the boiler geometry on the flow stability of the steam generators. For the two-drum boiler, the steady-state instability, namely, a reversed flow, is analyzed. Initial results of the investigation for the HRSG with a horizontal tube bank are also presented. In this case, the dynamic flow instability of density wave oscillations is analyzed.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Model of a natural circulation boiler

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Figure 2

Mass flow in the lower heated riser system 1 for different heat absorption ratios V as three-dimensional surface (3)

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Figure 3

Model of the two-drum boiler

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Figure 4

Temperature and mass flow of the flue gas

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Figure 5

Mass flow in various tubes of the two-drum boiler: dynamic behavior without cyclones and finned downcomer tubes (case 1)

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Figure 6

Mass flow in various tubes of the two-drum boiler: detail of the first 100s of the results shown in Fig. 5

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Figure 7

Pressure difference in various tubes of the two-drum boiler: dynamic behavior without cyclones and finned downcomer tubes (case 1)

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Figure 8

Mass flow in various tubes of the two-drum boiler: dynamic behavior without cyclones and plain downcomer tubes (case 2)

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Figure 9

Pressure difference in various tubes of the two-drum boiler: dynamic behavior without cyclones and plain downcomer tubes (case 2)

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Figure 10

Mass flow in various tubes of the two-drum boiler: dynamic behavior with cyclones and finned downcomer tubes (case 3)

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Figure 11

Pressure difference in various tubes of the two-drum boiler: dynamic behavior with cyclones and finned downcomer tubes (case 3)

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Figure 12

HRSG with a horizontal tube bank

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Figure 13

Mass flow in various tubes of the HRSG with a horizontal tube bank: dynamic behavior with da=48.3mm at all layers (case 4)

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Figure 14

Mass flow in various tubes of the HRSG with a horizontal tube bank: dynamic behavior with da=44.5mm for the first four layers (case 5)

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Figure 15

Comparison between the total pressure differences of the test cases 4 and 5 at all layers

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Figure 16

Mass flow in various tubes of the HRSG with a horizontal tube bank: dynamic behavior with da=44.5mm for the connecting tubes between the header and the first four layers (case 6)

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Figure 17

Mass flow in various tubes of the HRSG with a horizontal tube bank: dynamic behavior with da=44.5mm for the connecting tubes between the header and the first four layers and an additional orifice at the tube inlet (case 7)

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