Investigation of a Generic Gas Turbine Combustor With Exhaust Gas Recirculation

Exhaust Gas ◽

Nitric Oxides ◽

Gas Turbine Combustor ◽

A Minor ◽

On the topic of CO2 capture from gas turbines, exhaust gas recirculation (EGR) is a commonly discussed method to increase CO2 concentration at a gas turbine outlet to make the CO2 capture process more efficient. This paper presents the influence of the recirculation on heat release rate and emissions. The investigation is made using the commercial RANS solver ANSYS CFX coupled with an in-house code for a hybrid transported PDF/RANS simulation using detailed chemistry of GRI 3.0. Initially an investigation on reactivity was made using numerical calculation of laminar flame speed. It is found that exhaust gas recirculation has only a minor effect on reactivity in lean premixed combustion. Therefore, the operation point of the combustor can be kept constant with and without EGR. Simulations of the combustor with exhaust gas recirculation using the hybrid PDF/RANS with GRI 3.0 show a minor influence of NO and NO2 doping of the vitiated air on the flame speed and the doping delays heat release slightly. CO doping has no effect on heat release rate. CO emissions at combustor exit remain unaffected by NO, CO or NO2 doping. Seeding the vitiated air with 50ppm nitric oxides reveal that any NO2 present in the vitiated air is reduced to NO in the flame. NO2 emissions increase with NO2 doping but are still 2 magnitudes lower than NO emissions. It is found that NO is reduced by 3% due to of NO reburn. Based on literature data it is concluded that there is a deficit of the GRI 3.0 reaction mechanism. Experimental data taken from literature reveal of NO reburn by approximately 20%. Therefore emission data of nitric oxides of flames that should show a considerable reburn effect should be used with caution, while heat release and CO emissions are predicted more accurately. It is shown, that with the model created for the generic gas turbine combustor it is possible to study the effects of exhaust gas recirculation on the combustion process in detail and resolve detailed kinetic effects.

Exhaust Gas Recirculation Performance in Dry Low Emissions Combustors

Volume 2: Combustion, Fuels and Emissions, Parts A and B ◽

10.1115/gt2011-46482 ◽

2011 ◽

Cited By ~ 3

Author(s):

A. M. Elkady ◽

A. R. Brand ◽

C. L. Vandervort ◽

A. T. Evulet

Keyword(s):

Gas Turbine ◽

Co2 Capture ◽

Carbon Capture ◽

Power Plants ◽

Nox Reduction ◽

Co2 Concentration ◽

Exhaust Gas ◽

Low Oxygen ◽

In a carbon constrained world there is a need for capturing and sequestering CO2. Post-combustion carbon capture via Exhaust Gas Recirculation (EGR) is considered a feasible means of reducing emission of CO2 from power plants. Exhaust Gas Recirculation is an enabling technology for increasing the CO2 concentration within the gas turbine cycle and allow the decrease of the size of the separation plant, which in turn will enable a significant reduction in CO2 capture cost. This paper describes the experimental work performed to better understand the risks of utilizing EGR in combustors employing dry low emissions (DLE) technologies. A rig was built for exploring the capability of premixers to operate in low O2 environment, and a series of experiments in a visually accessible test rig was performed at representative aeroderivative gas turbine pressures and temperatures. Experimental results include the effect of applying EGR on operability, efficiency and emissions performance under conditions of up to 40% EGR. Findings confirm the viability of EGR for enhanced CO2 capture; In addition, we confirm benefits of NOx reduction while complying with CO emissions in DLE combustors under low oxygen content oxidizer.

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

Thermodynamic analysis of combined cycle gas turbine power plant with post-combustion CO2 capture and exhaust gas recirculation

10.1177/0954408912469165 ◽

2012 ◽

Vol 227 (2) ◽

pp. 89-105 ◽

Cited By ~ 32

Author(s):

Roberto Canepa ◽

Meihong Wang ◽

Chechet Biliyok ◽

Antonio Satta

Keyword(s):

Power Plant ◽

Gas Turbine ◽

Thermodynamic Analysis ◽

Co2 Capture ◽

Combined Cycle ◽

Exhaust Gas ◽

Gas Recirculation ◽

Gas Turbine Power Plant

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

Evaluation of a Micro Gas Turbine With Post-Combustion CO2 Capture for Exhaust Gas Recirculation Potential With Two Experimentally Validated Models

10.1115/gt2017-63551 ◽

2017 ◽

Author(s):

Homam Nikpey Somehsaraei ◽

Usman Ali ◽

Carolina Font-Palma ◽

Mohammad Mansouri Majoumerd ◽

Muhammad Akram ◽

...

Keyword(s):

Renewable Energy ◽

Gas Turbine ◽

Co2 Capture ◽

Software Tools ◽

Combined Cycle ◽

Exhaust Gas ◽

Capture Process ◽

Micro Gas Turbine ◽

The growing global energy demand is facing concerns raised by increasing greenhouse gas emissions, predominantly CO2. Despite substantial progress in the field of renewable energy in recent years, quick balancing responses and back-up services are still necessary to maintain the grid load and stability, due to increased penetration of intermittent renewable energy sources, such as solar and wind. In a scenario of natural gas availability, gas turbine power may be a substitute for back-up/balancing load. Rapid start-up and shut down, high ramp rate, and low emissions and maintenance have been achieved in commercial gas turbine cycles. This industry still needs innovative cycle configurations, e.g. exhaust gas recirculation (EGR), to achieve higher system performance and lower emissions in the current competitive power generation market. Together with reduced NOx emissions, EGR cycle provides an exhaust gas with higher CO2 concentration compared to the simple gas turbine/combined cycle, favorable for post-combustion carbon capture. This paper presents an evaluation of EGR potential for improved gas turbine cycle performance and integration with a post-combustion CO2 capture process. It also highlights features of two software tools with different capabilities for performance analysis of gas turbine cycles, integrated with post-combustion capture. The study is based on a combined heat and power micro gas turbine (MGT), Turbec T100, of 100kWe output. Detailed models for the baseline MGT and amine capture plant were developed in two software tools, IPSEpro and Aspen Hysys. These models were validated against experimental work conducted at the UK PACT National Core Facilities. Characteristics maps for the compressor and the turbine were used for the MGT modeling. The performance indicators of systems with and without EGR, and when varying the EGR ratio and ambient temperature, were calculated and are presented in this paper.

Combustion Characteristics, Emissions and Heat Release Rate Analysis of a Homogeneous Charge Compression Ignition Engine with Exhaust Gas Recirculation Fuelled with Diesel

Energy & Fuels ◽

10.1021/ef801010m ◽

2009 ◽

Vol 23 (5) ◽

pp. 2396-2404 ◽

Cited By ~ 8

Author(s):

Miguel Torres García ◽

Francisco J. Jiménez-Espadafor Aguilar ◽

Tomás Sánchez Lencero

Keyword(s):

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Combustion Characteristics ◽

Exhaust Gas ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Rate Analysis ◽

Selective exhaust gas recirculation in combined cycle gas turbine power plants with post-combustion CO2 capture

International Journal of Greenhouse Gas Control ◽

10.1016/j.ijggc.2018.01.017 ◽

2018 ◽

Vol 71 ◽

pp. 303-321 ◽

Cited By ~ 11

Author(s):

Laura Herraiz ◽

Eva Sánchez Fernández ◽

Erika Palfi ◽

Mathieu Lucquiaud

Keyword(s):

Gas Turbine ◽

Co2 Capture ◽

Power Plants ◽

Combined Cycle ◽

Exhaust Gas ◽

CFD analysis of exhaust gas recirculation in a micro gas turbine combustor for CO 2 capture

Fuel ◽

10.1016/j.fuel.2016.01.063 ◽

2016 ◽

Vol 173 ◽

pp. 146-154 ◽

Cited By ~ 9

Author(s):

Andrea De Santis ◽

Derek B. Ingham ◽

Lin Ma ◽

Mohamed Pourkashanian

Keyword(s):

Gas Turbine ◽

Exhaust Gas ◽

Cfd Analysis ◽

Gas Turbine Combustor ◽

Micro Gas Turbine ◽

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

Experimental investigation of the combustion characteristics and the emission characteristics of biogas–diesel dual fuel in a common-rail diesel engine

10.1177/0954407017691398 ◽

2017 ◽

Vol 231 (14) ◽

pp. 1900-1912 ◽

Cited By ~ 2

Author(s):

Yong Qian ◽

Yahui Zhang ◽

Xiaole Wang ◽

Xingcai Lu

Keyword(s):

Carbon Monoxide ◽

Heat Release ◽

Nitrogen Oxide ◽

Release Rate ◽

Dual Fuel ◽

Emission Characteristics ◽

Exhaust Gas ◽

Nitrogen Oxide Emissions ◽

An experimental study on biogas–diesel dual-fuel compression ignition was conducted in which biogas and diesel are used as the port-injected fuel and the directly injected fuel respectively. The effects of the total lower heating values QLHVs per cycle and the premixed ratio on the combustion characteristics and the emission characteristics are discussed in detail. The results show that, for constant QLHVs, the peak values of the heat release rate curves first decrease and then increase with increasing premixed ratio. Furthermore, the combustion phase is delayed. For a constant premixed ratio, with increasing QLHVs, the heat release rate curves change from a unimodal distribution to a bimodal distribution, and the ignition delay decreases constantly. With higher QLHVs, the nitrogen oxide emissions and the smoke emissions are relatively higher. In addition, the impacts of biogases with different components on the combustion and emissions were also researched. With increasing hydrogen, the combustion becomes increasingly concentrated, which leads to higher nitrogen oxide emissions. The proportion of carbon monoxide in the biogas has a great effect on the carbon monoxide emissions. Also, the influence of exhaust gas recirculation was also studied. With 60% exhaust gas recirculation, the nitrogen oxide emissions can be inhibited effectively.