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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Design Study of a Humidification Tower for the Advanced Humid Air Turbine System

[+] Author and Article Information
Hidefumi Araki, Shinichi Higuchi, Shinya Marushima, Shigeo Hatamiya

Hitachi Ltd., Power and Industrial Systems R&D Laboratory, 7-2-1 Omika-cho, Hitachi-shi, 319-1221, Japan

J. Eng. Gas Turbines Power 128(3), 543-550 (Sep 28, 2005) (8 pages) doi:10.1115/1.2132384 History: Received August 25, 2005; Revised September 28, 2005

The advanced humid air turbine (AHAT) system, which can be equipped with a heavy-duty, single-shaft gas turbine, aims at high efficiency equal to that of the HAT system. Instead of an intercooler, a WAC (water atomization cooling) system is used to reduce compressor work. The characteristics of a humidification tower (a saturator), which is used as a humidifier for the AHAT system, were studied. The required packing height and the exit water temperature from the humidification tower were analyzed for five virtual gas turbine systems with different capacities (1, 3.2, 10, 32, and 100MW) and pressure ratios (π=8, 12, 16, 20, and 24). Thermal efficiency of the system was compared with that of a simple cycle and a recuperative cycle with and without the WAC system. When the packing height of the humidification tower was changed, the required size varied for the three heat exchangers around the humidification tower (a recuperator, an economizer, and an air cooler). The packing height with which the sum total of the size of the packing and these heat exchangers became a minimum was 1m for the lowest pressure ratio case, and 6m for the highest pressure ratio case.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of AHAT (advanced humid air turbine) system

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Figure 2

Simplified model of WAC system

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Figure 3

Schematic of humidification tower

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Figure 4

Heat and mass transfer model inside the humidification tower packing

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Figure 5

Compressor inlet airflow rate and diameter of packing for each calculation case

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Figure 6

Compressor outlet temperature and turbine entry/exhaust temperature

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Figure 7

Cooling airflow ratio

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Figure 8

Humidification ratio by WAC system and humidification tower

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Figure 9

Comparison of thermal efficiency

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Figure 10

(a) Temperature and the humidity profiles and (b) temperature-enthalpy diagram inside the packing of 2m height for π=16 case

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Figure 11

Temperature of water at the humidification tower exit

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Figure 12

Packing height and log-mean temperature difference, and the KA value of the economizer for π=16 case

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Figure 13

KA values of (a) economizer, (b) air cooler, and (c) recuperator

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Figure 14

Volume of the three heat exchangers and the packing of the humidification tower required for 1MW of electric power output

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Figure 15

Size and shape of the packing required for each calculation case

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