Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

A First and Second Thermodynamics Law Analysis of a Hydrogen-Fueled Microgas Turbine for Combined Heat and Power Generation

[+] Author and Article Information
Francisco Toja-Silva

Av. Complutense,
40, Madrid 28040, Spain
e-mail: frantojasilva@yahoo.es

Antonio Rovira

E.T.S. Ingenieros Industriales – UNED,
C/Juan del Rosal, 12,
Madrid 28040, Spain
e-mail: rovira@ind.uned.es

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 11, 2012; final manuscript received August 21, 2013; published online October 25, 2013. Assoc. Editor: Kalyan Annamalai.

J. Eng. Gas Turbines Power 136(2), 021501 (Oct 25, 2013) (8 pages) Paper No: GTP-12-1482; doi: 10.1115/1.4025321 History: Received December 11, 2012; Revised August 21, 2013

As is well known, the increasing energy demand requires an efficient use of conventional energy sources, as well as the development of renewable technologies. The distributed generation systems entail significant benefits in terms of efficiency, emission reduction, availability and economy consequences. Renewable energy technologies are fed by intermittent resources. This feature makes the energy storage an important issue in order to improve the management or to enlarge annual operation of the facility. The use of hydrogen as an energy vector may satisfy this requirement and; at the same time, it introduces additional advantages in terms of energy efficiency and emissions reduction. This work presents an analysis based on the first and second thermodynamics law to investigate the efficiency of a hydrogen/oxygen-fueled gas turbine, which produces both electrical and thermal energy (cogeneration). A 20 kWe, microgas turbine is proposed to supply the base load demand of a residential area. The results show that the proposed facility is appropriate when the thermal energy demand is significant. We obtain an exergy efficiency of 45.7% and an energy efficiency of 89.4% regarding the lower heating value (LHV) of hydrogen. This high energy efficiency remains on the use of the liquid water effluent and the condensation heat. The main sources of irreversibility are analyzed and the effect of the design parameters on the energy and exergy efficiencies is discussed.

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Fig. 1

Diagram of the CHP microgas turbine fed with hydrogen and oxygen

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Fig. 2

Diagram T-s of the thermodynamic cycle of the proposed facility

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Fig. 3

Irreversibilities at each component of the facility

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Fig. 4

Sankey diagram with the exergy flows within the facility

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Fig. 5

Sensitivity analysis of the preheating temperature T9

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Fig. 6

Sensibility of the main design parameters according to P2

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Fig. 7

Sensibility of the main design parameters according to T3




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