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Advanced Gas Turbine Cycles with Water-Air Mixtures as Working Fluid
KTH, Superseded Departments, Chemical Engineering and Technology.
2000 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Since the early 80's, the worldwide utilization of gas turbines for thermal power generation has increased rapidly. They have less pollution than any other major combustion energy converters. One important development trend in gas turbine technology is new processes for better flue gas heat recovery (gaining better efficiency, power density and environmental impact), so called advanced cycles. The purpose of this work has been to evaluate the performance and process system and subsystems of advanced gas turbine cycles with air/water mixture as working medium. The focus of the thesis is on the evaporative gas turbine cycle. This cycle has extraordinary heat recovery possibilities. An increased understanding of the interaction of the different process components is sought, with an emphasis on modeling the high pressure humidification column. Efforts have been made to synthesize innovative strategies for EvGT humidification. Theoretical and experimental work concerning the water recovery and purification issues are also presented.

Some important results are that the flow of air through the humidifier should be optimized. For the different cases presented in this thesis, the optimal fraction (with regard to efficiency) varies from about 12% to 40% of the compressor inlet air. Savings in heat exchanger area and reduced pressure work for booster fan are advantages of using only a part of the compressor air in the humidifier. For obtaining best efficiency of the evaporative cycle, the heat flows above the boiling point should preferably be taken care of by conventional boilers for steam injection or by a separate humidifier section working only slightly below boiling temperature. This is particularly important in gas turbines without intercooling or without recuperation due to high temperatures in exit streams. The unique nature of the humidifier is its ability to evaporate water below the boiling point, by the use of air dilution. However, the best temperature performance (lowest temperature of outlet water from humidifier) is reached if the thermal loading on the humidifier is not excessive.

The need for large quantities of demineralized water has previously been identified as a possible drawback for the EvGT cycle. In favor of the EvGT-technology, the first water testing experiments on a pilot EvGT-plant, presented in this work, contradict this notion. It is theoretically and experimentally shown that an EvGT-plant can be run with no external water feed at all, by means off lue gas condensation and condensate recovery. After internal condensate treatment, the recycled condensate was of equal quality or better than the deionized fresh feed used for initial system fill-up.

Place, publisher, year, edition, pages
Stockholm: Kemiteknik , 2000. , 54 p.
Series
TRITA-KET, ISSN 1104-3466 ; 120
Keyword [en]
gas turbine cycles, HAT cycles, evaporative cycles, power generation
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-3010OAI: oai:DiVA.org:kth-3010DiVA: diva2:8757
Public defence
2000-09-18, 00:00
Note

NR 20140805

Available from: 2000-09-13 Created: 2000-09-13 Last updated: 2017-04-05Bibliographically approved

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  • apa
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