Research Papers: Gas Turbines: Cycle Innovations

Design Concept for Large Output Graz Cycle Gas Turbines

[+] Author and Article Information
H. Jericha, E. Göttlich

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Graz, Austria

W. Sanz

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Graz, Austriawolfgang.sanz@tugraz.at

J. Eng. Gas Turbines Power 130(1), 011701 (Dec 26, 2007) (10 pages) doi:10.1115/1.2747260 History: Received June 12, 2006; Revised February 14, 2007; Published December 26, 2007

The introduction of closed cycle gas turbines with their capability of retaining combustion generated CO2 can offer a valuable contribution to the Kyoto goal and to future power generation. Therefore research and development work at the Graz University of Technology since the 1990s has led to the Graz Cycle, a zero emission power cycle of highest efficiency. It burns fossil fuels with pure oxygen which enables the cost-effective separation of the combustion CO2 by condensation. The efforts for the oxygen supply in an air separation plant are partly compensated by cycle efficiencies far higher than for modern combined cycle plants. Upon the basis of the previous work, the authors present the design concept for a large power plant of 400 MW net power output making use of the latest developments in gas turbine technology. The Graz Cycle configuration is changed, insofar as condensation and separation of combustion generated CO2 takes place at the 1 bar range in order to avoid the problems of condensation of water out of a mixture of steam and incondensable gases at very low pressure. A final economic analysis shows promising CO2 mitigation costs in the range of $20–30/ton CO2 avoided. The authors believe that they present here a partial solution regarding thermal power production for the most urgent problem of saving our climate.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 9

Influence of capital costs on the mitigation costs (CO2 provided at 100bar)

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Figure 1

Principle flow scheme of the basic Graz Cycle power plant

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Figure 2

Principle flow scheme of modified Graz Cycle power plant with condensation/evaporation in the 1bar range

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Figure 3

Heat-temperature diagram of the condensation/evaporation process

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Figure 4

Arrangement of the main turbomachinery for a 400MW Graz Cycle plant

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Figure 5

C1 design with an uncooled drum rotor and an additional radial stage from nickel alloy, with radial diffuser and exit scroll to the intercooler

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Figure 6

Design of C2 drum rotor with cooling steam flow arrangement, combuster, and HTTC

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Figure 7

Design of two-stage HTTC and 50Hz HTTP

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Figure 8

Design of transonic one-stage HTTC and 60Hz HTTP



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