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Research Papers: Gas Turbines: Coal, Biomass, and Alternative Fuels

Techno-Economic Assessment of Gas Turbine Cogeneration Cycles Utilizing Anaerobic Digestion Products for Biogas Fuel

[+] Author and Article Information
Georgios Kontokostas

Department of Mechanical Engineering,
Polytechnic School,
University of Thessaly,
Volos 38334, Greece

Ioannis Goulos

Propulsion Engineering Centre,
School of Aerospace, Transport
and Manufacturing,
Cranfield University,
Bedfordshire MK43 0AL, UK
e-mail: i.goulos@cranfield.ac.uk

1Corresponding author.

Contributed by the Coal, Biomass and Alternate Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 15, 2016; final manuscript received June 16, 2016; published online August 16, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(1), 011401 (Aug 16, 2016) (13 pages) Paper No: GTP-16-1221; doi: 10.1115/1.4034156 History: Received June 15, 2016; Revised June 16, 2016

This work presents the development of an integrated approach for the techno-economic assessment of recuperated gas turbine cycles utilizing anaerobic digestion (AD) products of animal manure and energy crops for biogas fuel. The overall approach consists of a series of modeling methods applicable to AD and biogas fuel yield, thermodynamic evaluation of cogenerated gas turbine cycles, exergy analysis, and economic evaluation of powerplant operation. The developed method is applied for the techno-economic analysis of an AD plant yielding biogas fuel supplied to a recuperated gas turbine. The influence of gas turbine technology level on the economic sustainability of cogenerated powerplants powered by AD products is investigated. The obtained results suggest that the dominant cycle variables affecting the electrical performance of integrated digestion–cogeneration systems are the gas/air temperatures at the combustor outlet and recuperator air side (AS) exit, respectively. It is demonstrated that the profitability of the investment is highly dependent on electrical power output and the feed-in tariff used for electrical energy. It is argued that the desired split between electrical and thermal power output is dependent on the gas turbine technology level. It is shown that optimizing the cogenerated cycle for maximum electrical power output is key in terms of securing investment sustainability. A general review of the acquired results indicates that anaerobic treatment of animal manure and energy crops to produce biogas fuel can constitute a sustainable investment. This applies especially for cases that substantial volumes of substrates are available to ensure stable powerplant operation.

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Figures

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Fig. 1

Techno-economic analysis model architecture

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Fig. 2

Thermodynamic cycle configuration of a recuperated cogeneration gas turbine engine: station numbering

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Fig. 3

Effect of polystyrene insulation thickness on digester tank heat demand

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Fig. 4

Effect of cycle OPR and COT on recuperated engine performance parameters: (a) electrical efficiency ratio, (b) heat rate ratio, and (c) recuperator GS inlet and AS exit temperatures for nrec=88%

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Fig. 5

Effect of recuperator effectiveness nrec and cycle COT on electrical efficiency

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Fig. 6

Effect of technology level on cogenerated gas turbine cycle performance parameters: (a) electrical efficiency ratio, (b) heat rate ratio, and (c) exergetic efficiency ratio

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Fig. 7

Effect of COT and OPR on the exergetic efficiency of cogenerated gas turbine engine cycles

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Fig. 8

Economic sustainability assessment: (a) annual revenue and expenses, (b) annual EBITDA, OIBDA and EBT, and (c) cash account

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Fig. 9

Effect of gas turbine technology level on projected cash account

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Fig. 10

Effect of gas turbine technology level on the IRR

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