TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Using Hydrogen as Gas Turbine Fuel

[+] Author and Article Information
Paolo Chiesa, Giovanni Lozza

Dipartimento di Energetica, Politecnico di Milano, Milano, Italy

Luigi Mazzocchi

CESI, Milano, Italy

J. Eng. Gas Turbines Power 127(1), 73-80 (Feb 09, 2005) (8 pages) doi:10.1115/1.1787513 History: Received October 01, 2002; Revised March 01, 2003; Online February 09, 2005
Copyright © 2004 by ASME
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Relation between NOx emission and stoichiometric flame temperature, progressively reduced by steam dilution, for gas turbine diffusive combustion at 12–16 bar with different fuels. Nitrogen is the balance gas for 56% and 95% hydrogen.
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Variation of the SFT and of the inlet volume flow rate and isentropic enthalpy drop of a hydrogen fueled gas turbine with respect to the reference natural gas case. Curves are drawn as a function of the added diluent flow rate: the upper diagram refers to steam, the lower diagram to nitrogen.
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Typical compressor characteristic curve at constant rotational speed. Different lines correspond to different settings of the variable guide vanes angle.
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Typical turbine characteristic curve at constant rotational speed
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Simplified blade cooling model. Blade is assumed as a cross-flow heat exchanger where heat capacity of the outer stream is infinitely larger than the one of the inner stream. Main temperature profiles are reported in the right diagram.
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Temperature–heat-transfer area diagrams showing different situations in the simplified cooling circuit of Fig. 5. Temperature profiles have the same meaning of Fig. 5: from left, they refer to coolant, inner blade wall, outer blade wall, main gas stream. The continuous lines refer to the original situation, the dashed ones to modified conditions.
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(a) Combined cycle net power output, (b) combined cycle net efficiency, (c) total temperature at first rotor inlet (TIT), (d) air flow at compressor inlet, (e) gas turbine pressure ratio, (f) gas turbine/steam cycle power output




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