The Combined Reheat Gas Turbine/Steam Turbine Cycle: Part I—A Critical Analysis of the Combined Reheat Gas Turbine/Steam Turbine Cycle

Abstract

The reheat gas turbine cycle combined with the steam turbine Rankine cycle holds new promise of appreciably increasing power plant thermal efficiency. Apparently the cycle has been overlooked and thus neglected through the years. Research and development is being directed towards other gas turbine areas because of the world energy crunch; and in order to focus needed technical attention to the reheat cycle, this paper is presented, using logic and practical background of heat recovery boilers, steam turbines, gas turbines and the process industry. A critical analysis is presented establishing parameters of efficiency, cycle pressure ratio, firing temperature and output. Using the data developed, an analysis of an actual gas generator, the second generation LM5000, is applied with unique approaches to show that an overall 50 percent efficiency power plant can be developed using today’s known techniques and established base-load firing temperatures.

Energy and exergy analysis of steam cooled reheat gas–steam combined cycle

“…Macchi and Chiesa [3], El Masri [4], Bannister et al [5], Rice [6][7][8], Gambini et al [9], Bhargava and Perotto [10], Poullikkas [11] have studied and predicted performance of reheat gas turbine using air as coolant. In the light of the above works the present work is aimed at: To identify and quantify the sources of losses in the selected configuration (R3PR) with different means of cooling and hence to try for minimizing these losses to achieve maximum efficiency in R3PR.…”

Prediction of Film Cooling Effectiveness of Steam

“…The possibility of developing a combined reheat gas turbine/reheat steam turbine cycle, as proposed in the recent ASME papers by Rice [13][14][15][16][17] opens the way to prospects of using extracted superheated steam from a conventional steam cycle for the gas turbine blade and vane cooling [Jenkins and Rice,[18][19]. Superheated steam, as a coolant, compared to air is considerably better, particularly in regards to thermal properties for film cooling and radiation heat absorptivity from hot gas streams.…”

The Reheat Power Turbine With Steam Cooling: A Means of Increasing Reheat Temperature, Exhaust Temperature and Combined-Cycle Efficiency

“…The reheat-firing temperature is also limited as a result. This limitation has been previously reported to ASME by this author (1)(2)(3)(4)(5)(6)(7) and by the Japanese (8)(9). Ways of overcoming this limitation will be covered in this paper, and the resulting cycle improvements made possible in terms of output and cycle efficiency will be analyzed and set forth.…”

“…Certain assumptions must be made in analyzing the proposed non-intercooled reheat-gas turbine combined cycle (RHGT-CC) such as combustor-pressure drop, compression efficiency, expansion efficiency, combustion efficiency, air leakage, boiler loss, generator loss, etc. Assumptions used in the referencedpapers (1)(2)(3)(4)(5)(6) have been retained in this paper for continuity and for comparitive purposes.…”