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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Natural Gas Fired Combined Cycles With Low CO2 Emissions

[+] Author and Article Information
Paolo Chiesa, Stefano Consonni

Dipartimento di Energetica, Politecnico di Milano, P.zza Leonardo da Vinci, 32, 20133 Milan, Italy

J. Eng. Gas Turbines Power 122(3), 429-436 (May 15, 2000) (8 pages) doi:10.1115/1.1287496 History: Received March 09, 1999; Revised May 15, 2000
Copyright © 2000 by ASME
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Combined cycle configurations considered in the paper. The difference between schemes A and B lies in the recirculation of part of the flue gases to the gas turbine compressor.
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Chemical absorption system considered in the paper. The configuration is representative of typical ethanolamine plants adopted in the chemical industry 2
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Marginal cost of electricity (COE) versus carbon tax. For new plants yet to be built, the marginal COE incorporates all costs, including the cost of capital. For existing plants, marginal COE does not include amortization, whereby the marginal cost of existing NGFSCs is the same of switching existing PCSCs to natural gas.
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Cost of electricity of conventional gas-fired CCs and Scheme B versus natural gas price and carbon tax. In the leftward region, where conventional CCs are more convenient, the lines at constant COE refer to NGFCCs; in the rightward region they refer to Scheme B.
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Marginal COE of alternative strategies for the addition of 100 MW of new capacity under the constraint of virtually constant CO2 emissions. All strategies (a) to (e) imply an increase of CO2 emissions of 3.75 t/h, i.e., 0.0374 kgCO2 per kWh generated in excess of the production of the existing system.
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Optimum strategies to reduce CO2 emissions at constant generation capacity. Lines at constant cost of avoided CO2 emission always refer to the cheapest strategy; in the rightmost region where IGCCs with shift and CO2 removal should replace existing PCSCs, the cost of avoided CO2 emissions is almost constant (about 69.2 $/tonnCO2). Δe is the reduction of specific emissions of each strategy.

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