Effect and mechanism of combustion enhancement and emission reduction for non-premixed pure ammonia combustion based on fuel preheating

Chen, Yifeng; Zhang, B.; Su, Yi; Sui, Chunjie; Zhang, Junqing

doi:10.1016/j.fuel.2021.122017

Cited by 38 publications

(10 citation statements)

References 39 publications

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“…In this region, it is expected that the level of thermal NO X to be lower than the fuel NO X . Moreover, Chen et al [23] highlighted that the significant NO X emission of pure ammonia in nonpremix combustion is proportional to the degree of completion of the combustion.…”

Section: Ammonia In the Boilermentioning

confidence: 99%

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Comparative analysis of ammonia combustion for domestic applications

Bazooyar

Coomson²,

Manović³

et al. 2023

Journal of the Energy Institute

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Section: Ammonia In the Boilermentioning

confidence: 99%

“…They highlighted that flame stabilisation and NO X emissions are two potential problems that are needed to be addressed for the successful delivery of ammonia in nonpremixed systems. Chen et al [23] suggested that NO X emissions can be reduced when enhancing NH 3 combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of ammonia combustion for domestic applications

Bazooyar

Coomson²,

Manović³

et al. 2023

Journal of the Energy Institute

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“…Although ammonia can replace hydrocarbon fuel in gas turbines, the consumption of ammonia fuel is 2.25 times higher than that of methane fuel for the same power output. In addition, ammonia fuel has the disadvantages of low laminar flame velocity, narrow flammability equivalence ratio, and high minimum ignition energy (Chen et al, 2022). These disadvantages result in a flame that isn't easily ignited, has poor stability, and has a low heat release rate.…”

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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“…Current methods for achieving the stable combustion of NH 3 mainly include mixed combustion with hydrocarbon fuels [11], optimisation of heat and mass transfer processes [12], increase of turbulence intensity [13] and external auxiliary technology [14]. In addition, problems of high NO X emission whilst improving the reactivity of NH 3 must be urgently solved.…”

Section: Introductionmentioning

confidence: 99%

Flame and emission characteristics from NH3/CH4 combustion under ultrasonic excitation

Chen

Sui

et al. 2023

THERM SCI

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As a high energy density hydrogen-rich carrier, ammonia (NH3) is a highly promising carbon-free fuel. The large-scale industrial application of NH3 is limited by its low reactivity and high nitrogen oxide (NOX) emission. In this work, the flame and emission characteristics of ammonia/methane (NH3/CH4) non-premixed combustion were investigated under ultrasonic excitation. An experimental system was designed and built, including non-premixed combustion system, loading ultrasonic system, deflection tomography temperature measurement system and flue gas measurement system. Combustion and measurement experiments at different ultrasonic frequencies and NH3/CH4 blending ratios were carried out. Flame images and flue gas species concentrations under ultrasonic excitation were acquired. The 3D temperature field was reconstructed. The influence of ultrasonic excitation at different frequencies on flame characteristics, flame temperature field and emission characteristics of the combustion process was analysed. The mechanism of NH3/CH4 combustion enhancement and emission reduction was revealed when the flame was excited by ultrasonic waves. Results showed that part of the hydrocarbon fuels was replaced by NH3 to reduce carbon dioxide (CO2) emission. The height and colour of the NH3/CH4 flame were changed and the high-temperature area of the flame gradually expanded as ultrasonic acted on the flame. As ultrasonic frequency increased, the emission concentrations of unburned CH4, unburned NH3 and NO decreased significantly. The flame was excited by ultrasonic waves, which reduced its local equivalent ratio, improved combustion efficiency and suppressed NOX generation.

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Effect and mechanism of combustion enhancement and emission reduction for non-premixed pure ammonia combustion based on fuel preheating

Cited by 38 publications

References 39 publications

Comparative analysis of ammonia combustion for domestic applications

Comparative analysis of ammonia combustion for domestic applications

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

Flame and emission characteristics from NH3/CH4 combustion under ultrasonic excitation

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