Impact of the operating conditions and position of exhaust gas recirculation on the performance of a micro gas turbine

Ali, Usman; Font-Palma, Carolina; Hughes, Kevin J.; Ingham, D.B.; Ma, Lin; Pourkashanian, Mohamed

doi:10.1016/b978-0-444-63576-1.50097-2

Cited by 7 publications

(7 citation statements)

References 5 publications

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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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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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“…EGR has already been tested both numerically and experimentally on large-scale Gas Turbines (GTs) [4][5][6][7], while, from a small-scale point of view, it has been only simulated [8][9][10]. Recirculating around 60% of the exhaust gas in the compressor inlet of a mGT would increase CO 2 concentration from 1.5% to 4.3% and decrease the exhaust mass flow rate by approximately 55% [8].…”

Section: Introductionmentioning

confidence: 99%

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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“…The EGR ratio is varied to check its impact on the system performance through the splitter in the model to adjust the amount of the EGR ratio defined by Equation (5). The modelling is done at the ISO conditions and electrical power output is maintained at 100 kW e and TOT is fixed at 645 o C. The location for the recycle and process conditions of the recycle stream is already optimised by the author (Ali et al, 2015a). The increase in the EGR ratio increases CO 2 in the exhaust gas with a decrease in O 2 concentration both at the combustor inlet and exhaust gas, as shown in Figure 5 (a).…”

Section: 3effect Of the Egr Ratiomentioning

confidence: 99%

“…In addition, the increase in the CO 2 concentration in the working stream of the gas turbine, due to the EGR, results in the change of the thermodynamic properties of the fluid stream, both in the turbo machinery and the combustion section of the gas turbine (Ali et al, 2015b). Also, the recycled stream results in a higher water content at the combustor inlet, which can be controlled by the condenser present in the recycle loop (Ali et al, 2015a). Further, the injection of the recycle stream can be done at various locations in the gas turbine, resulting in different control algorithms due to the imbalance on the shaft (Ali et al, 2015a).…”

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“…Also, the recycled stream results in a higher water content at the combustor inlet, which can be controlled by the condenser present in the recycle loop (Ali et al, 2015a). Further, the injection of the recycle stream can be done at various locations in the gas turbine, resulting in different control algorithms due to the imbalance on the shaft (Ali et al, 2015a). An important consideration for EGR operation is that the maximum amount of the exhaust gas to be circulated is still undefined, as with an increase in the EGR, the combustion kinetics, stability, and emissions issues arise.…”

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

Ali

Hughes

Ingham

et al. 2017

Chemical Engineering Research and Design

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Effect of the CO 2 enhancement on the performance of a micro gas turbine with a pilot-scale CO 2 Highlights: A validated process model of the micro gas turbine is presented.  A validated CO 2 injected micro gas turbine model is presented.  EGR is evaluated as mean to enhance the CO 2 content and reduce amount of flue gas.  Effect of CO 2 enrichment on the pilot-scale CO 2 capture plant is evaluated.  Effect of CO 2 enrichment on the thermodynamic properties of turbo machinery is assessed. AbstractGas turbines are a viable and secure option both economically and environmentally for combined heat and power generation. Process modelling of a micro gas turbine for CO 2 injection and exhaust gas recirculation (EGR) is performed. Further, this study is extended to assess the effect of the CO 2 injection on the pilot-scale CO 2 capture plant integrated with a micro gas turbine. In addition, the impact of the EGR on the thermodynamic properties of the fluid at different locations of the micro gas turbine is also evaluated. The micro gas turbine and CO 2 injection models are validated against the set of experimental data and the performance analysis of the EGR cycle results in CO 2 enhancement to 5.04 mol% and 3.5 mol%, respectively. The increased CO 2 concentration in the flue gas, results in the specific reboiler duty decrease by 20.5 % for pilot-scale CO 2 capture plant at 90 % CO 2 capture rate for 30 wt. % MEA aqueous solution. The process system analysis for the validated models results in a much better comprehension of the impact of the CO 2 enhancement on the process behaviour.Keywords: Micro gas turbine; Process modelling; CO 2 injection; Exhaust gas recirculation; Specific reboiler duty. Nomenclature IntroductionThe energy trend across the globe is changing due to the overwhelming concern regarding emission of greenhouse gases from the power generation sector (IEA, 2012). The contribution of the conventional power generation system, including coal-and natural gas-power generation, is in the gradual transition stage towards more sustainable systems, as towards low or zero carbon emission emitters. However, natural gas-fired power plants are a secure and viable option both economically and e...

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Impact of the operating conditions and position of exhaust gas recirculation on the performance of a micro gas turbine

Cited by 7 publications

References 5 publications

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

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

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

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

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