Evaluation of Design Performance of the Semi-Closed Oxy-Fuel Combustion Combined Cycle

Yang, Hyun Jun; Kang, Dong Won; Ahn, Jae Hoon; Kim, T. S.

doi:10.1115/1.4007322

Cited by 41 publications

(11 citation statements)

References 18 publications

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“…This can partly explain that only some of the studies aimed at optimizing the cycle with respect to pressure ratio, while others only selected a pressure ratio based on, for example, experience. Corchero et al [14] and Yang et al [16] looked at different pressure ratios and show similar trends as has been found in the current study. The resulting efficiencies from these studies have a very large spread and ranges from 36.7% to 53.9%.…”

Section: Scoc-ccsupporting

confidence: 89%

“…Corchero et al did a parametric study with regard to the pressure ratio at a fixed turbine entry temperature of 1327 ∘ C [14]. Yang et al [16] modelled the SOCC-CC along with the ASU and the CO 2 compression train at different pressure ratios and two different turbine inlet temperatures, 1200 ∘ C and 1600 ∘ C. They concluded that the optimal pressure ratio is around 60 and 90 for the turbine inlet temperatures of 1418 ∘ C and 1600 ∘ C, respectively. With optimal design conditions, the net cycle efficiency is lower than the efficiency of the conventional CC by about 8 percentage points for both of the two turbine inlet temperatures.…”

Section: Scoc-ccmentioning

confidence: 99%

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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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Section: Scoc-ccsupporting

confidence: 89%

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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“…*this value is attributed by independent researchers [52] which lies between the one provided by the company [9] and Llorente [38], 58.9 and 51.9%, respectively. **this value approximates efficiencies presented in other studies [53,54] The economic data provided for each cycle have different assumptions depending on factors such as the power plant size, the fuel price, the discount rate, etc. Thus, in order to show the results and make them comparable, the costs for each cycle have been divided by the costs for its reference plant (CCGT), obtaining a ratio that represents their overcost.…”

Section: Economicsupporting

confidence: 77%

A technical evaluation, performance analysis and risk assessment of multiple novel oxy-turbine power cycles with complete CO2 capture

Barba

Martínez‐Denegri

Seguí

et al. 2016

Journal of Cleaner Production

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In recent years there has been growing concern about greenhouse gas emissions (particularly CO2 emissions) and global warming. Oxyfuel combustion is one of the key technologies for tackling CO2 emissions in the power industry and reducing their contribution to global warming. The technology involves burning fuel with high-purity oxygen to generate mainly CO2 and steam, enabling easy CO2 separation from the flue gases by steam condensation. In fact, 100% CO2 capture and near-zero NOx emissions can be achieved with this technology.This study examines nineteen different oxy-turbine cycles, identifying the main parameters regarding their operation and development. It also analyses the use of advanced natural gas combustion cycles from the point of view of the carbon capture and storage (CCS) and considering political, legislative and social aspects of deploying this technology. Six oxy-turbine cycles which are at the most advanced stages of development (NetPower, CES, Modified Graz, E-MATIANT, AZEP100% and SCOC-CC), were chosen to conduct a Political, Environmental, Social, Technological, Legislative and Economic (PESTLE) risk analysis. This compares each technology with a conventional combined cycle gas turbine (CCGT) power plant without carbon capture as the base-case scenario. Overall, the net efficiency of the different oxy-turbine cycles ranges between 43.6% and 65%, comparable to a CCGT power plant, while providing the extra benefits of CO2 capture and lower emissions.A multi-criteria analysis carried out using DECERNS (Decision Evaluation in Complex Risk Network Systems) software determined that, depending on the specific criterion considered, one can draw different conclusions. However, in terms of technology, environment and social opinion, the most promising cycles are the NetPower and CES cycles, whereas from an economic point of view, E-MATIANT is more competitive in the energy market. Giving each factor equal importance, the NetPower cycle must be considered to be the best oxy-turbine cycle based on our analysis.Most of the oxy-turbine cycles are still under development and only a few cycles (e.g., CES and NetPower) are progressing to the demonstration phase. In consequence, political measures such as CO2 tax and emission allowances need to be implemented for oxy-turbine technologies to become the preferred option for fossil fuel power plants burning natural gas.

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“…Recently, alternative thermodynamic cycles are actively investigated, permitting, without significant energy costs, to remove CO 2 , formed as a result of fuel combustion [1][2][3][4], from the cycle. Calculations have shown that such cycles may not be inferior to the most advanced power plants with regard to thermal efficiency [4].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the Allam cycle and the cycle of compressorless combined cycle gas turbine unit

2020

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Nowadays, alternative thermodynamic cycles are actively studied. They allow to remove CO2, formed as a result of fuel combustion, from a cycle without significant energy costs. Calculations have shown that such cycles may meet or exceed the most advanced power plants in terms of heat efficiency. The Allam cycle is recognized as one of the best alternative cycles for the production of electricity. Nevertheless, a cycle of compressorless combined cycle gas turbine (CCGT) unit is seemed more promising for cogeneration of electricity and heat. A comparative analysis of the thermal efficiency of these two cycles was performed. Particular attention was paid to ensuring equal conditions for comparison. The cycle of compressorless CCGT unit was as close as possible to the Allam cycle due to the choice of parameters. The processes, in which the difference remained, were analysed. Thereafter, an analysis of how close the parameters, adopted for comparison, to optimal for the compressorless CCGT unit cycle was made. This analysis showed that these two cycles are quite close only for the production of electricity. The Allam cycle has some superiority but not indisputable. However, if cogeneration of electricity and heat is considered, the thermal efficiency of the cycle of compressorless CCGT unit will be significantly higher. Since it allows to independently regulate a number of parameters, on which the electric power, the ratio of electric and thermal power, the temperature of a working fluid at the turbine inlet depend. Thus, the optimal parameters of the thermodynamic cycle can be obtained in a wide range of operating modes of the unit with different ratios of thermal and eclectic powers. Therefore, the compressorless CCGT unit can significantly surpass the best steam turbine and combined cycle gas turbine plants in district heating system in terms of thermal efficiency.

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Evaluation of Design Performance of the Semi-Closed Oxy-Fuel Combustion Combined Cycle

Cited by 41 publications

References 18 publications

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

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

A technical evaluation, performance analysis and risk assessment of multiple novel oxy-turbine power cycles with complete CO2 capture

Comparative analysis of the Allam cycle and the cycle of compressorless combined cycle gas turbine unit

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