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

Best, Thom; Finney, Karen N.; Ingham, D.B.; Pourkashanian, Mohamed

doi:10.1016/j.energy.2016.09.075

Cited by 26 publications

(20 citation statements)

References 17 publications

(39 reference statements)

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“…This had an impact on the turbine efficiency, which increased specific fuel consumption by 2.9% and the CO and the UHC emissions respectively by 109% and 338%. On the other hand, NO x emissions showed a decreasing trend when increasing CO 2 [11].…”

Section: Introductionmentioning

confidence: 95%

Humidified Micro Gas Turbine for Carbon Capture Applications: Preliminary Experimental Results With CO2 Injection

Giorgetti

Parente

Contino

et al. 2018

Volume 3: Coal, Biomass, and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organic Rankine

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The large adoption of renewable energies is crucial to achieve a low-carbon economy, however, in the transition period, a flexible and clean production from fossil fuels is still necessary. With the current shift towards decentralized power production, micro Gas Turbines (mGTs) appear as a promising technology for small-scale generation. The target of a carbon-clean power production calls for the implementation of Carbon Capture Use and Storage (CCUS) technologies. Compared to coal fired power production, the low CO2 concentration in the exhaust gas of a mGT makes Carbon Capture (CC) much more expensive. However, the CO2 concentration can be increased by performing Exhaust Gas Recirculation (EGR), therefore reducing the CC energy penalty. Additionally, cycle humidification can also help to increase the electrical efficiency of the turbine plant. Nevertheless, the higher CO2 content in the inlet air, in combination with the high humidity level, will affect the operation of the mGT. This paper presents a numerical study of this innovative cycle combined with preliminary experimental validation of CO2 injection. To the authors’ best knowledge, experimental analysis of EGR together with humidification applied to a mGT has never been carried out. Experimental results showed a stable turbo-machinery operation under a moderate CO2 injection. The results of this paper are a first step towards a more severe dilution conditions, with the aim of a full implementation of EGR on a micro Humid Air Turbine (mHAT).

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Section: Introductionmentioning

confidence: 95%

Humidified Micro Gas Turbine for Carbon Capture Applications: Preliminary Experimental Results With CO2 Injection

Giorgetti

Parente

Contino

et al. 2018

Volume 3: Coal, Biomass, and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organic Rankine

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“…CO 2 . This is as a result of CO 2 injection into the micro gas turbine compressor inlet, to simulate different gas compositions typical of EGR/S‐EGR processes . The CO 2 concentration of the flue gas going to the capture plant can also be varied by directly injecting CO 2 into the slip stream …”

Section: Post‐combustion Co2 Capture In Gas‐fired Systemsmentioning

confidence: 99%

“…This is as a result of CO 2 injection into the micro gas turbine compressor inlet, to simulate different gas compositions typical of EGR/S-EGR processes. 52 The CO 2 concentration of the flue gas going to the capture plant can also be varied by directly injecting CO 2 into the slip stream. 16 The results obtained in the commercial and pilot plants mentioned above and in further process simulation studies indicate that there are opportunities for significant process improvements, which have the potential to reduce capital and operational costs.…”

Section: Amine Capture Plant Systemsmentioning

confidence: 99%

Making gas‐CCS a commercial reality: The challenges of scaling up

et al. 2017

Self Cite

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Significant reductions in CO 2 emissions are required to limit the global temperature rise to 2°C. Carbon capture and storage (CCS) is a key enabling technology that can be applied to power generation and industrial processes to lower their carbon intensity. There are, however, several challenges that such a method of decarbonization poses when used in the context of natural gas (gas-CCS), especially for solvent-based (predominantly amines) post-combustion capture. These are related to: (i) the low CO 2 partial pressure of the exhaust gases from gas-fired power plants (ß3-4%vol. CO 2 ), which substantially limits the driving force for the capture process; (ii) their high O 2 concentration (ß12-13%vol. O 2 ), which can degrade the capture media via oxidative solvent degradation; and (iii) their high volumetric flow rates, which means large capture plants are needed. Such post-combustion gas-CCS features unavoidably lead to increased CO 2 capture costs. This perspective aims to summarize the key technologies used to overcome these as a priority, including supplementary firing, humidified systems, exhaust gas recirculation and selective exhaust gas recirculation. These focus on the maximum CO 2 levels achievable for each, as well as the electrical efficiencies attainable when the capture penalty is taken into account. Oxy-turbine cycles are also discussed as an alternative to post-combustion gas-CCS, indicating the main advantages and limitations of these systems together with the expected electrical efficiencies. Furthermore, we consider the challenges for scaling-up and deployment of these technologies at a commercial level to enable gas-CCS to play a crucial role in a low-carbon future. C

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“…Additional carbon dioxide delivered to the combustion chamber, e.g., from EGR, can affect combustion parameters such as flame temperature, laminar and turbulent flame speed, heat transfer, flame length, combustion efficiency, and NO and CO emission. A lot of research has been done on EGR application in micro-gas turbines (MGT) and gas turbines in the context of CCS [5][6][7]. Recently, Best et al investigated the impact of CO 2 -enriched air combustion in the micro-gas turbine Turbec T100 PH.…”

Section: Introductionmentioning

confidence: 99%

“…They expected that 8% CO 2 by volume may be supplied to combustion air without blowoff (about 35% EGR). The influence of CO 2 on NO x reduction was in the range from 0.20 g/kWh to 1.01 g/kWh, although a minor decrease of efficiency was observed [5]. ElKady et al [8] tested the general electric DLN combustor with EGR rate up to 40%.…”

Section: Introductionmentioning

confidence: 99%

Study on the Combustion Process of Premixed Methane Flames with CO2 Dilution at Elevated Pressures

Ślefarski

2019

Energies

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The article presents the results of experimental and numerical investigation of turbulent premixed methane flames diluted by carbon dioxide (up to 30%) at atmospheric and elevated pressures (up to 0.5 MPa). The study included the influence of fuel properties and operation parameters on the emission of NOx and CO as well as flame properties. The investigation has been prepared for two combustion system configurations (axisymmetric flames and flames supported by a pilot flame) in a wide range of air/fuel equivalence ratios (ϕ = 0.42 ÷ 0.85). It has been reported that reduction of NOx emission by CO2 fuel dilution reached a level of up to 45% in atmospheric conditions and 30% at elevated pressure, decreasing with a drop in the equivalence ratio. The results have shown influence of pressure on NOx composition, where for pressurized tests, NO2 was doubled compared to atmospheric tests. Carbon monoxide emission rises with CO2 content in the fuel as a result of thermal dissociation, but this phenomenon is mitigated by a pressure increase. Planar laser induced fluorescence (PLIF) study has shown that flame length decreases with an increase in pressure and CO2 content in the fuel. Fuel staging increased NOx emission, especially for richer flames (ϕ > 0.6) at low pressure, while CO increased in the whole range of equivalence ratios.

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

Cited by 26 publications

References 17 publications

Humidified Micro Gas Turbine for Carbon Capture Applications: Preliminary Experimental Results With CO2 Injection

Humidified Micro Gas Turbine for Carbon Capture Applications: Preliminary Experimental Results With CO2 Injection

Making gas‐CCS a commercial reality: The challenges of scaling up

Study on the Combustion Process of Premixed Methane Flames with CO2 Dilution at Elevated Pressures

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