Design of a Semiclosed Cycle Gas Turbine With Carbon Dioxide-Argon as Working Fluid

Ulizar, Iñaki; Pilidis, Pericles

doi:10.1115/97-gt-125

Cited by 11 publications

(4 citation statements)

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“…5 Modifi cations are also required to adapt gas turbines to the new working fl uid and oxy-fuel combustion. 6 Th us, continuous eff orts have been made to predict the working characteristics of various components in the cycle and to handle such a new power plant. [7][8][9][10][11][12][13] Th e mechanical design will likely present no signifi cant problems with the use of state-of-the-art technology, and the primary issue will involve the economic considerations.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method

Song

2015

Greenhouse Gases

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This paper outlines the aerodynamic performance of a highly loaded 5‐stage compressor in a conceptual semi‐closed cycle. An in‐house throughflow computation procedure that has been proven to be a powerful tool in aerodynamic analysis for modern compressors is applied to simulate the compressor. The influences of changes in physical properties of the working medium with varying ratios of exhaust CO2 recirculation are considered in the computation. A series of numerical simulations is conducted with two settings depending on whether the rotational speed is set to obey the criterion of similarity. For the identical non‐dimensional speed parameter, the compressor can operate stably with pure CO2 as the working fluid. The distributions of aerodynamic parameters undergo no big differences under various CO2 contents; however, a somewhat little higher loss is observed for the 5th stage. When the absolute rotational speed is set according to the originally designed value, the compressor can bear a 25% CO2 content at the cost of a substantially narrowed working range, and a recirculation ratio of approximately 10% is a safe threshold value. The aerodynamic configuration also undergoes a notable redistribution given these circumstances; the load of the front stages is reduced, but the rear stages become the risk factors at near stall condition. This research reveals that from the compressor design point of view, a semi‐closed cycle is feasible using existing technology and that compressor modifications are needed according to situational requirements. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Introductionmentioning

confidence: 99%

Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method

Song

2015

Greenhouse Gases

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“…They started with cycle optimization and also simulated off-design performance. They did more extensive work exploring the selection of an optimal cycle pressure ratio and turbine inlet temperature [6] and on operational aspects of the cycle [7]. Bolland and Mathieu also published studies on the SCOC-CC concept [8] comparing its merits with a postcombustion removal plant.…”

Section: Scoc-ccmentioning

confidence: 99%

A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles

Thorbergsson

Grönstedt

2016

Journal of Energy

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A comparative analysis of two mid-sized oxyfuel combustion combined cycles is performed. The two cycles are the semiclosed oxyfuel combustion combined cycle (SCOC-CC) and the Graz cycle. In addition, a reference cycle was established as the basis for the analysis of the oxyfuel combustion cycles. A parametric study was conducted where the pressure ratio and the turbine entry temperature were varied. The layout and the design of the SCOC-CC are considerably simpler than the Graz cycle while it achieves the same net efficiency as the Graz cycle. The fact that the efficiencies for the two cycles are close to identical differs from previously reported work. Earlier studies have reported around a 3% points advantage in efficiency for the Graz cycle, which is attributed to the use of a second bottoming cycle. This additional feature is omitted to make the two cycles more comparable in terms of complexity. The Graz cycle has substantially lower pressure ratio at the optimum efficiency and has much higher power density for the gas turbine than both the reference cycle and the SCOC-CC.

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“…b) Keep ambient air as the basic working fluid and remove CO 2 by a separation process conveniently located along the cycle. Concept a) translates into the semi-closed cycle analyzed by Mathieu and De Buick (1993), Ulizar and Pilidis (1997), Chiesa and Lozza (1998). Rather than being vented to the atmosphere, the gas turbine exhausts -almost exclusively comprised of CO 2 and 1120-are cooled (thereby condensing most of the water), deprived of the CO2 generated in the combustor and then sent back to the gas turbine compressor.…”

Section: Plant Configurationsmentioning

confidence: 99%

Shift Reactors and Physical Absorption for Low-CO2 Emission IGCCs

Chiesa

Consonni

1998

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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Integrated Gasification Combined Cycles (IGCC) exhibit conditions particularly favourable to the sequestration of CO2. The concept pursued in this paper is the generation of syngas low in carbon, where most of the heating value of the coal fuel is carried by hydrogen. Catalytic shift reactors convert most of the CO in the syngas into CO2, which is subsequently removed by physical absorption and then compressed to make it suitable for transport and permanent storage. Energy balances, performance and cost of electricity are evaluated for two plants based on a Texaco gasifier and a large, heavy-duty gas turbine giving an overall IGCC power output between 350 and 400 MW. In one plant the raw syngas exiting the gasifier is cooled in a high-temperature, radiative cooler; in the other it is quenched by the injection of liquid water. With respect to “conventional” Texaco IGCCs, the reduction of specific CO2 emissions by 90% reduces LHV efficiency from 5 to 7 percentage points and increases the cost of electricity of about 45%. These penalties can be reduced by accepting lower reductions of CO2 emissions. Compared to the semi-closed cycle considered by other authors, where CO2 is the main component of the gas turbine working fluid, the plants analyzed here exhibit higher efficiency over the whole range of specific CO2 emissions.

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Design of a Semiclosed Cycle Gas Turbine With Carbon Dioxide-Argon as Working Fluid

Cited by 11 publications

References 0 publications

Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method

Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method

A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles

Shift Reactors and Physical Absorption for Low-CO2 Emission IGCCs

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