Effect of the CO2 enhancement on the performance of a micro gas turbine with a pilot-scale CO2 capture plant

Ali, Usman; Hughes, Kevin J.; Ingham, D.B.; Ma, Lin; Pourkashanian, Mohamed

doi:10.1016/j.cherd.2016.10.001

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…This cooled, recycled exhaust gas replaces a fraction of the inlet air in the working fluid that passes through the turbine, thus decreasing the flow rate and increasing the CO 2 concentration of the exhaust gas sent to the CO 2 capture plant. As a result, the energy penalty and costs associated with CO 2 capture from NGCC plants reduce, notably, both equipment size and reboiler duty …”

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

confidence: 99%

“…As a result, the energy penalty and costs associated with CO 2 capture from NGCC plants reduce, notably, both equipment size and reboiler duty. 15,16,22,23,[45][46][47] Deployment of EGR in NGCC power plants at industrial scale presents several challenges, mainly related to flame stability. From Fig.…”

Section: Exhaust Gas Recirculationmentioning

confidence: 99%

“…This, in turn, can result in significant energy and cost reductions -particularly in the capital and operational expenditure (CAPEX and OPEX) -and contribute to the deployment of gas-CCS. For this purpose, modifications to existing systems, alternative processes and new configurations have been proposed, including the use of supplementary firing, 8,[12][13][14]20,21 exhaust gas recirculation, 8,15,16,22,23 selective exhaust gas recirculation, 17,24 and humidified cycles. 8,[17][18][19][25][26][27][28] Also, advancements have been made for the development of oxy-fired gas turbine cycles, 15,[29][30][31][32][33][34] which are seen as a potential alternative to post-combustion capture systems.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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

confidence: 99%

Section: Exhaust Gas Recirculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…A schematic diagram of the integrated system, the MGT with EGR coupled to the CO 2 capture plant, that has been modeled using Hysys and IPSEpro is shown in Figure 10. A full description of the MGT with EGR can be found in [51,52]; main features are described again herein. In the two models, part of the exhaust gas is circulated back to the compressor inlet of the MGT to mix with air, defined as the EGR ratio.…”

Section: Integrated Systemmentioning

confidence: 99%

Benchmarking of a micro gas turbine model integrated with post-combustion CO 2 capture

Ali

Font-Palma

Somehsaraei

et al. 2017

Energy

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The deployment of post-combustion CO 2 capture on large-scale gas-fired power plants is currently progressing, hence the integration of the power and capture plants requires a good understanding of operational requirements and limitations to support this effort. This article aims to assist research in this area, by studying a micro gas turbine (MGT) integrated with an amine-based post-combustion CO 2 capture unit. Both processes were simulated using two different software tools IPSEpro and Aspen Hysys, and validated against experimental tests. The two MGT models were benchmarked at the nominal condition, and then extended to part-loads (50 and 80 kW e), prior to their integration with the capture plant at flue gas CO 2 concentrations between 5 and 10 mol%. Further, the performance of the MGT and capture plant when gas turbine exhaust gases were recirculated was assessed. Exhaust gas recirculation increases the CO 2 concentration, and reduces the exhaust gas flowrate and specific reboiler duty. The benchmarking of the two models revealed that the IPSEpro model can be easily adapted to new MGT cycle modifications since turbine temperatures and rotational speeds respond to reaching temperature limits; whilst a detailed rate-based approach for the capture plant in Hysys resulted in closely aligned simulation results with experimental data.

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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%

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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Effect of the CO2 enhancement on the performance of a micro gas turbine with a pilot-scale CO2 capture plant

Cited by 10 publications

References 38 publications

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

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

Benchmarking of a micro gas turbine model integrated with post-combustion CO 2 capture

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

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