DBPapers
DOI: 10.5593/sgem2017/42/S17.045

INCREASING THE EFFICIENCY OF COGENERATION PLANTS WITH GAS TURBINES, BY USING COMBINED GAS-STEAM CYCLES

V. E. CENUSA, D. TUTICA, F. N. ALEXE, C. V. APOSTOL
Tuesday 12 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7408-07-2 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 42, 361-368 pp, DOI: 10.5593/sgem2017/42/S17.045

ABSTRACT

The paper is a technical analysis for choosing the heat supply source of a technological heat consumer requiring steam at 2 parameters pairs: 32 bar & 400⁰C, respectively 6.4 bar & at least 200⁰C. The analysis of the whole combined heat and power plant (CHPP) processes and performances are performed for 4 CHPP designs, all of them with Gas Turbines (GT) and Heat Recovery Steam Generators (HRSG), through the numerical modeling of the processes in the CHPP components and by assembling them. The computing steps are: 1) modeling the heat load curve; 2) GTs selection; 3) choosing the steam circuit design, and steam parameters; 4) the HRSG’s processes modeling; 5) the steam turbines processes modeling, and 6) the assembly modeling. For each design we quantify the main technical indicators: a) electrical efficiency, b) thermal efficiency, c) global efficiency, d) electricity versus heat ratio, and e) the fuel savings through cogeneration. The results indicate that, for almost the same global efficiencies in all 4 designs, the best values for electricity vs. heat ratios, and for fuel savings through cogeneration, are obtained using gas and steam combined cycles.

Keywords: cogeneration, industrial heat consumers, gas turbines, heat recovery steam generators, combined cycle.