Impacts of exhaust gas recirculation (EGR) on the natural gas combined cycle integrated with chemical absorption CO2 capture technology

Li, Hailong; Haugen, Geir; Ditaranto, Mario; Berstad, David; Jordal, Kristin

doi:10.1016/j.egypro.2011.02.006

Cited by 96 publications

(63 citation statements)

References 9 publications

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“…However these focused on the combustor performance isolated from the turbine, and not the whole system. These studies have shown that EGR can take the exhaust emissions of a Combined Cycle Gas Turbine (CCGT) from 3.8% up to 10% with 55% EGR [10]. These percentages are possibly even pessimistic as Evulet, et al [13] experimentally achieved over 8% CO 2 in the exhaust at the equivalent 25% EGR, and ElKady, et al [12] achieved over 10% CO 2 at 35% EGR.…”

Section: Introductionmentioning

confidence: 99%

“…Li, et al [9,10] found that 60% EGR meant only sufficient oxygen for stoichiometric combustion, and at 55% EGR, only 11% oxygen for combustion. O 2 at 11% is insufficient for a stable flame to be maintained , and for complete combustion resulting in lean blow out, excess CO and unburnt hydrocarbons [9].…”

Section: Introductionmentioning

confidence: 99%

“…There have been a significant number of high quality modelling studies such as those by Li, et al [9,10] and Mansouri, et al [11] into the potential benefit of exhaust gas recirculation (EGR) implementation on gas turbines to increase the CO 2 partial pressure, and create net efficiency gains through reboiler duty reduction. The optimal EGR ratio is the highest degree to which combustion is kept stable and does not require additional vitiation with oxygen to maintain the flame.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of CO2-enriched combustion air on micro-gas turbine performance for carbon capture

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Finney

Ingham

et al. 2016

Energy

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of CO2-enriched combustion air on micro-gas turbine performance for carbon capture

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Finney

Ingham

et al. 2016

Energy

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“…However, the EGR ratio is limited to 35-40% in practice (Li et al, 2011 andMerkel et al, 2013) as increased an increasing EGR ratio reduces the level of oxygen that is available in the air to the combustion chamber. The O 2 concentration in the inlet air to the combustion chamber should be greater than 16% to prevent the production of significant quantities of unburned hydrocarbons and carbon monoxide (Li et al, 2011). The maximum EGR ratio is therefore the value that leads to an O 2 concentration of 16% in the inlet air to the combustion chamber.…”

Section: Maximum Egr Ratiosmentioning

confidence: 99%

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Adams

Dowell

2016

Applied Energy

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The use of natural gas for power generation is becoming increasingly important in many regions in the world. Given that the combined cycle gas turbine (CCGT) power stations are lower in capital cost and carbon intensity than their coal-fired counterparts, natural gas fired power stations are considered a vital part of the transition to a low carbon economy. However, CCGTs are not themselves "low carbon" and in order to reach a carbon intensity of less than 50 kg CO2 /MWh, it will be necessary to decarbonise them via CCS, with postcombustion CCS currently regarded as being a promising technology for this application. In this study, we present a detailed model of a 420 MW triple-pressure reheat CCGT and evaluate its technical and economic performance under full and part load conditions. We evaluate the technical performance of our CCGT model by comparison to an equivalent model implemented in Thermoflow THERMOFLEX and observe agreement of power output and efficiency to within 4.1% and the temperature profile within the HRSG within 2.9%. We further integrate the CCGT with a dynamic model of an amine based CCS process, and observe a reduction in the base plant efficiency from 51.84% at full-load and 50.23% at 60% load by 8.64% points at full-load and 7.93% points at 60% load. A core conclusion of this paper is that CCGT power plants equipped with post-combustion CCS technologies are well suited to dynamic operation, as might be required in an energy system characterised by high penetrations of intermittent renewable power generation.

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“…Traditionally, membrane-based carbon capture has only been considered for natural gas sweetening before NGCC [3] and for pre-combustion capture before the IGCC process [4], while post-combustion capture has only been studied in depth using solvent absorption [5][6][7][8][9], or as a novel Integrated Gasification Combined Cycle (IGCC) process with flue gas recycling [10]. This is because for NGCC the flue gas has a low CO 2 partial pressure which has previously been seen as a limitation for membrane gas separation.…”

Section: Introductionmentioning

confidence: 99%

Membrane-Cryogenic Post-Combustion Carbon Capture of Flue Gases from NGCC

Scholes

Wiley

2016

Technologies

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Membrane gas separation for carbon capture has traditionally been focused on high pressure applications, such as pre-combustion capture and natural gas sweetening. Recently a membrane-cryogenic combined process has been shown to be cost competitive for post-combustion capture from coal fired power stations. Here, the membrane-cryogenic combined process is investigated for application to post-combustion carbon capture from the flue gas of a Natural Gas Combined Cycle (NGCC) process. This process involves a three-membrane process, where the combustion air is used as the sweep gas on the second membrane stage to recycle CO 2 through the turbine. This ensures high CO 2 recovery and also increases the CO 2 partial pressure in the flue gas. The three-CO 2 -selective membrane process with liquefaction and O 2 -enrichment was found to have a cost of capture higher than the corresponding process for coal post-combustion capture. This was attributed to the large size and energy duty of the gas handling equipment, especially the feed blower, because of the high gas throughput in the system caused by significant CO 2 recycling. In addition, the economics were uncompetitive compared to a modelled solvent absorption processes for NGCC.

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Impacts of exhaust gas recirculation (EGR) on the natural gas combined cycle integrated with chemical absorption CO2 capture technology

Cited by 96 publications

References 9 publications

Impact of CO2-enriched combustion air on micro-gas turbine performance for carbon capture

Impact of CO2-enriched combustion air on micro-gas turbine performance for carbon capture

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Membrane-Cryogenic Post-Combustion Carbon Capture of Flue Gases from NGCC

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