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Thermodynamic Analysis of Different Configurations for Microturbine Cycles in Simple and Cogeneration Systems

[+] Author Affiliations
Ehsan Sadeghi, Hiwa Khaledi, Mohammad Bagher Ghofrani

Sharif University of Technology, Tehran, Iran

Paper No. GT2006-90237, pp. 247-255; 9 pages
doi:10.1115/GT2006-90237
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4240-1 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

In recent years, the development of distributed power generation has resulted in significant reduction in network losses and transmission costs while it has increased reliability. Microturbine is one of these power generators that has the ability of relatively high power generation in spite of its small volume [1], [2]. In this paper, different layouts for advanced microturbine cycles are analyzed. In order to modify cycle characteristics such as power and efficiency, and reduce exergy destruction, different configurations including intercooler, aftercooler, and heat recovery boiler are separately and synthetically analyzed and compared. The effects of various parameters, such as compressor pressure ratio, vapor pressure, and bypass ratio on the cycle performance are studied. For configurations including inter/aftercooling, the possibility of use of heat recovery boiler is surveyed, depending on the temperature of the coolers outlet water and the recuperator outlet gas. Each part of the cycle is analyzed based on first and second laws of thermodynamics. Results show that microturbine with intercooler and recuperator (MTC-IC) is the best option, with regard to efficiency and power criteria, but its steam production is less than simple cycle with recuperator (MTC). MTC-IC has higher total exergetic efficiency in higher pressure ratios, because of the priority of power versus heat. This configuration is also more suitable than MTC with heat recovery boiler for variable thermal loads especially with bypass ratio between 0 and 0.5.

Copyright © 2006 by ASME

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