Title: Externally fired biomass gasification-based combined cycle plant: exergo-economic analysis

Authors: P. Mondal; S. Ghosh

Addresses: Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India ' Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India

Abstract: This paper reports an exergo-economic evaluation of an externally fired biomass gasification-based plant. Effects of major design and operating parameters: pressure ratio (r_p), gas turbine inlet temperature (TIT) and cold end temperature difference (CETD) of the heat exchanger (HX), on the plant performance are reported. Parametric optimisation has also been attempted. The study reveals that, higher r_p and lower TIT result in higher unit product cost of the plant. Also unit product cost decreases with increase in CETD of the HX. It is further observed that levelised unit cost of electricity is minimised at a particular combination of the parameters.

Keywords: biomass gasification; combined cycle; exergy analysis; exergo-economic evaluation; electricity costs; pressure ratio; gas turbines; turbine inlet temperature; cold end temperature difference; heat exchangers; plant performance; parametric optimisation.

DOI: 10.1504/IJEX.2016.078097

International Journal of Exergy, 2016 Vol.20 No.4, pp.496 - 516

Received: 22 Jun 2015
Accepted: 21 Nov 2015
Published online: 02 Aug 2016 *

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