Investigation on combustion characteristics and emissions of biogas/hydrogen blends in gas turbine combustors

Benaissa, Sabrina; Adouane, B.; Ali, Shahzad; Rashwan, Sherif S.; Aouachria, Z.

doi:10.1016/j.tsep.2021.101178

Cited by 26 publications

(9 citation statements)

References 54 publications

(57 reference statements)

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“…As reported in previous studies, a constant heat input is a common constraint for evaluating various fuel compositions in gas turbine combustors. 15,16 Accordingly, in this study, the simulation cases were conducted assuming constant heat input in the combustor, gas turbine inlet pressure, and temperature, similar to the reference case.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Kim,

Mai,

et al. 2023

International Journal of Engine Research

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Hydrogen energy forms an attractive solution for reducing greenhouse gas emissions from gas turbine systems. Although hydrogen combustion has been widely studied for combustors, only a few studies have considered the combustion effect downstream of the combustor. This study conducted an integral simulation of the combustion and flow of a GE-E3 aero-engine under hydrogen fuel and compared its performance with that of representative fossil fuels such as Jet A in an aero-engine and methane in an industrial gas turbine. All simulations were conducted under a constant heat input at the combustor and turbine inlet temperatures. During combustion simulation, the HyChem mechanism was applied to evaluate the composition of the products in an equilibrium model. Specifically, Reynolds-averaged Navier–Stokes steady simulation of a two-stage high-pressure gas turbine was conducted using the calculated boundary condition from the combustion simulation and k − ω shear stress transport γ turbulence model. The results revealed the high velocity of the hydrogen combustion flue gas owing to its low density under a large pressure difference. Overall, the power output, thermal efficiency, and fuel consumption were improved by hydrogen combustion. The thermal and flow results of the simulation can be used to develop hydrogen gas turbines.

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Section: Methodsmentioning

confidence: 99%

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Kim,

Mai,

et al. 2023

International Journal of Engine Research

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“…Other successful works account for gaseous non-premixed combustion in can-type combustor. [33] Hence, a strategy of simulation for unsteady flamelet model allowed to predict both fast and slow-forming species, such as NO x , with detailed chemical nonequilibrium due to straining effect of turbulence. Unsteady flamelet species calculation used Equation ( 14):…”

Section: Combustion Simulationmentioning

confidence: 99%

Analysis of Gas Turbine Combustor Exhaust Emissions: Effects of Transient Inlet Air Pressure

Tenango‐Pirín,

Espinosa,

García

et al. 2023

Energy Tech

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Gas turbine combustors are often subjected to combustion instabilities because of variability of operating conditions, affecting components, and altering exhaust emissions. Herein, the analysis focuses on simulating numerically the non‐premixed combustion as unsteady flamelet combustion and detailed kinetic mechanism. The goal is analyzing exhaust gases under unsteady inlet airflow conditions to define operation guidelines. The numerical approach is validated using data from the literature for nonperturbed cases. Three periodical perturbations of different amplitude show differences with the nonperturbed case. Besides emission of exhaust gases, the temperature field is sensitive to airflow inlet conditions. According to the simulation results, a strong dependence of temperature and pressure in primary and dilution zones of combustor exists on the inlet air pressure condition. Emissions of flue gases like CO and NOx respond to combustor thermal behavior showing high sensitivity to inlet air pressure as well. Results indicate that moderate pressure oscillations may derive into flashback effects.

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“…The study also developed laminar flame velocity analysis correlations for biogas/hydrogen–air mixtures related to the operating conditions of combustion chambers in internal combustion engines and gas turbines. In addition to this, Sabrina et al [ 10 ] demonstrated that mixing hydrogen in a gas turbine combustion chamber can stabilize flame operation, extend flammability limits, and reduce CO 2 emissions. The study also includes details related to the importance of the recirculation zone in stabilizing stability and the role of secondary air in reducing the temperature of the combustion chamber wall.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

Zhang,

Liu,

Huang

et al. 2023

Energy Tech

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In this article, the effects of hydrogenation amount (0–80%), oxygen content (14–18%), and strain rate (10–1000 s−1) on the emission characteristics of NO and CO in moderate or intense low‐oxygen dilution (MILD) fractional combustion are studied under the actual working conditions of gas turbine (T = 723 K, P = 16.5 atm). The pathway of NO and CO production and the reaction with the greatest influence on their emissions are analyzed. In the findings, it is indicated that NO emissions are suppressed at lower hydrogen levels, while the addition of hydrogen leads to a decrease in CO emissions. Specifically, the key reaction for NO formation is H + NO + M = HNO + M, whereas CO emissions are primarily controlled by the direct reaction OH + CO = H + CO2. Furthermore, the reduction of oxygen levels effectively suppresses NO and CO emissions during MILD combustion. The variation in oxygen level exerts the greatest influence on the reaction rate of the NNH pathway. High concentrations of O2 are identified as the primary cause of elevated CO levels in MILD combustion. Finally, elevating the strain rate in MILD combustion demonstrates a mitigating effect on NO and CO emissions.

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Investigation on combustion characteristics and emissions of biogas/hydrogen blends in gas turbine combustors

Cited by 26 publications

References 54 publications

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Analysis of Gas Turbine Combustor Exhaust Emissions: Effects of Transient Inlet Air Pressure

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

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Investigation on combustion characteristics and emissions of biogas/hydrogen blends in gas turbine combustors

Cited by 26 publications

References 54 publications

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Hydrogen combustion in two-stage high-pressure gas turbine—thermal and flow simulations for performance comparison with fossil fuels

Analysis of Gas Turbine Combustor Exhaust Emissions: Effects of Transient Inlet Air Pressure

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH4/H2 in Staged MILD Combustion

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Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion