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Research Papers: Heat Exchangers

Geometric and Thermodynamic Optimization of a Heat Recovery Steam Generator: A Constructal Design

[+] Author and Article Information
E. Norouzi

Department of Energy System Engineering, Faculty of Mechanical Engineering,  K. N. Toosi University of Technology, 19991-43344 Tehran, Iranelnaznorouzi@gmail.com

M. Mehrgoo

Department of Energy System Engineering, Faculty of Mechanical Engineering,  K. N. Toosi University of Technology, 19991-43344 Tehran, Iranmortezamehrgoo@yahoo.com

M. Amidpour1

Department of Energy System Engineering, Faculty of Mechanical Engineering,  K. N. Toosi University of Technology, 19991-43344 Tehran, Iranamidpour@kntu.ac.ir

1

Corresponding author.

J. Heat Transfer 134(11), 111801 (Sep 28, 2012) (12 pages) doi:10.1115/1.4007070 History: Received October 05, 2011; Revised June 08, 2012; Published September 28, 2012; Online September 28, 2012

Heat recovery steam generator (HRSG) is a critically important subsystem of a combined cycle. The global objective of a HRSG is to heat the stream of water. The HRSG is composed of three major sections, including an economizer, an evaporator, and a superheater. In this study, a water tube HRSG is considered and its main design features are deduced from the minimization of the entropy generation by using the constructal theory. Entropy generation is obtained by considering all irreversibilities associated with the processes. Considering the minimum total entropy generation as the objective function, the optimum parameters in the HRSG unit are derived by using the genetic algorithm method under the fixed total volume condition. In the present work, the number and arrangement of the tubes, the optimal diameters of tubes and spacing between adjacent tubes for three main sections, total length, width, and height of the HRSG unit and the water flow rate are significant features of the flow configuration inducted by the constructal design. Furthermore, the effect of changing in the size of the flow system on the flow architecture is determined.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of a water tube HRSG unit

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Figure 2

Schematic of evaporator

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Figure 3

Schematic of superheater and economizer

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Figure 4

Effect of the saturation temperature on the optimized gas temperature at exit of the economizer

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Figure 5

Effect of the saturation temperature on the optimized superheated temperature

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Figure 6

Optimized steam flow rate for different values of the saturation temperature

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Figure 7

Optimized entropy generation number as a function of the saturation temperature

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Figure 8

Effect of the gas flow rate on the optimized steam flow rate

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Figure 9

Effect of flow rate of flue gas on the optimized exhaust gas temperature and superheated temperature

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Figure 10

Optimized gas pressure drop as a function of gas flow rate

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Figure 11

Optimized entropy generation number values by varying flow rate of flue gas

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Figure 12

Effect of flue gas flow rate on optimized tubes diameter of three sections of HRSG

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Figure 13

Variation of the optimized size of HRSG versus flue gas flow rate

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