Numerically study of CH4/NH3 combustion characteristics in an industrial gas turbine combustor based on a reduced mechanism

Sun, Jihao; Yang, Qiang; Zhao, Ningbo; Chen, Mingmin; Zheng, Hongtao

doi:10.1016/j.fuel.2022.124897

Cited by 35 publications

(8 citation statements)

References 62 publications

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“…The available heat (Q 1 , kJ kg −1 ) entering the furnace could be determined by (16) where Q k is the heat entrained by the combustion air (kJ kg −1 ).…”

Section: Discussionmentioning

confidence: 99%

“…For NH 3 combustion, some studies have been carried out since the 1960s, mainly focusing on flame propagation properties and various reaction mechanisms . Some other studies have focused on cofiring NH 3 with gas, gasoline or coal in the porous media, the internal engine, the gas turbine, − or the bench scale furnace. − However, little attention has been devoted to the feasibility of coupling NH 3 with coal in utility boilers. Zhang et al built a computation fluid dynamics model for a pulverized coal combustion facility to analyze the impacts of cofiring NH 3 with coal on NO x emission, flame shape, and combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Yao

Wang

et al. 2022

Energy Fuels

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As an alternative to hydrogen, hydrogen-derived fuel (NH3, CH3OH, or CH3OCH3) is considered to be an ideal secondary energy source. The effects of coupling hydrogen-derived fuels with coal on the thermodynamic parameters of a boiler are analyzed through thermal calculations according to the principles of mass and energy conservation. A 300 MW tangentially fired boiler is selected for a case study. The results show that the variations of boiler thermodynamic parameters depend on the properties of hydrogen-derived fuels and coupling mass percentage. After the coupling, the furnace exit flue gas temperature changes, which results in alterations in heat distribution of radiation and convection for the water-cooled walls and the convective heating surfaces. The furnace exit flue gas temperature drops for coupling H2 or NH3 but rises for coupling CH3OH or CH3OCH3 with the growth of the coupling mass percentage. The variations of boiler thermal efficiency with different coupling mass percentages under BMCR load are 0.55% to 0.90% for H2, −0.32% to −1.16% for NH3, −0.22% to −2.03% for CH3OH, and −0.08% to −0.59% for CH3OCH3. The acid dew point rises and then drops as the coupling mass percentage grows. The flow rate of the total flue gas increases at the outlet of the air preheater. Thus, the current forced draft fan could not meet the requirements, and its retrofit should be performed. After the large proportion of cofiring, the coal consumption rate drops. The annual emissions reductions of CO2 are up to 0.734 million tons for H2, 0.231 million tons for NH3, 0.062 million tons for CH3OH, and 0.101 million tons for CH3OCH3 under BMCR load at a 20% coupling mass percentage. The lifecycle CO2 reduction potential should be considered for better illustrating the benefits of cocombustion in future studies.

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“…The available heat (Q 1 , kJ kg −1 ) entering the furnace could be determined by (16) where Q k is the heat entrained by the combustion air (kJ kg −1 ).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Yao

Wang

et al. 2022

Energy Fuels

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“…The use of ammonia/methane mixtures is one of the ways to promote ammonia as a natural gas substitute fuel. 22,23 Stable combustion of ammonia-containing mixed fuels in gas turbine combustion chambers and reducing the high emission of NO in combustion ames are among the most important challenges in the development of gas turbine combustion chambers. Therefore, extensive data simulation and analysis are necessary for the development of burners for ammonia and ammonia mixed with other fuels.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the effect of NH₃ addition on CH₄/air combustion characteristics under gas turbine operating conditions

Liu,

Zhang,

et al. 2024

Sustainable Energy Fuels

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“…In order to improve the characteristics of ammonia, more reactive fuels can be used for doping with ammonia, such as methane (Valera-Medina et al, 2015) and hydrogen (Zhang et al, 2022). Since methane is the main component of natural gas fuel widely used in gas turbines, using ammonia/methane blends is one way to promote ammonia as an alternative fuel to natural gas (An et al, 2021;Sun J. et al, 2022). To design an advanced gas turbine combustor, the ammonia/methane fuel in the combustor must achieve the goal of stable combustion and low NO x emission.…”

Section: Introductionmentioning

confidence: 99%

Premixed combustion and emission characteristics of methane diluted with ammonia under F-class gas turbine relevant operating condition

Zhang

Zhao

et al. 2023

Front. Energy Res.

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Ammonia has been used on a small scale in other industrial equipment, such as gas turbines, as a carbon-free fuel. However, ammonia fuel suffers disadvantages such as high ignition temperature, low flame velocity and high NOx emissions. Doping with ammonia using a more reactive fuel, such as methane, can solve the above problems. Therefore, under the relevant operating conditions of the gas turbine (T = 723 K, p = 16.5 atm), the effect of ammonia content on the combustion and emission characteristics of laminar premixed methane flames was numerically investigated. This research uses the PREMIX code from ANSYS CHEMKIN-PRO 2020 and Okafor chemical kinetic mechanisms and provides a reference for our subsequent analysis of gas turbine operating conditions. Firstly, the emission data of major pollutants under different ammonia content (XNH3 = 0–1.0) and equivalent ratio (Φ = .6–1.4) were calculated. Then, the laminar premixed flame structure is analyzed under the lean fuel conditions associated with gas turbines (Φ = .6, .8). Finally, the effect of ammonia addition on the chemical reaction path of NO and CO emission was studied. The results show that ammonia/methane mixture fuel is more suitable for combustion at .6 < Φ < .8 under high temperature and pressure. High ammonia content (XNH3 > .6) and low equivalent ratio can reduce NO and CO emissions. The molar fractions of H, O, and OH radicals and flame temperature decreased with the increase in ammonia content. In addition, high temperature and high pressure conditions and ammonia content greatly influence the reaction path of NO and CO production. The increase in pressure resulted in a change in the primary reaction that produced NO. In conclusion, this study guides reducing the emission of NO and CO from lean side of gas turbine plants.

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Numerically study of CH4/NH3 combustion characteristics in an industrial gas turbine combustor based on a reduced mechanism

Cited by 35 publications

References 62 publications

Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Numerical study of the effect of NH₃ addition on CH₄/air combustion characteristics under gas turbine operating conditions

Premixed combustion and emission characteristics of methane diluted with ammonia under F-class gas turbine relevant operating condition

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Numerically study of CH4/NH3 combustion characteristics in an industrial gas turbine combustor based on a reduced mechanism

Cited by 35 publications

References 62 publications

Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Feasibility Analysis of Coupling Hydrogen-Derived Fuel on a Coal-Fired Boiler for Power Generation

Numerical study of the effect of NH3 addition on CH4/air combustion characteristics under gas turbine operating conditions

Premixed combustion and emission characteristics of methane diluted with ammonia under F-class gas turbine relevant operating condition

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Product

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Numerical study of the effect of NH₃ addition on CH₄/air combustion characteristics under gas turbine operating conditions