Numerical investigation on NOx emissions and thermal performance of hydrogen/ammonia fueled micro-combustors with periodic wall structures

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122347 - 122347

Published: Jan. 1, 2025

Language: Английский

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Experimental and numerical investigation on optimizing energy efficiency and emissions reduction of ammonia fueled combustion with addition of hydrogen and porous media

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122422 - 122422

Published: Jan. 1, 2025

Language: Английский

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Multi-objective impact mechanism on the performance characteristic for a diesel particulate filter by RF-NSGA III-TOPSIS during soot loading

Energy, Journal Year: 2023, Volume and Issue: 286, P. 129582 - 129582

Published: Nov. 10, 2023

Language: Английский

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Thermal performances investigation on an ammonia-fuelled heat-recirculating micro-combustor with reduced chemical mechanism

Applied Thermal Engineering, Journal Year: 2023, Volume and Issue: 236, P. 121685 - 121685

Published: Oct. 2, 2023

This study addresses the challenges in utilizing ammonia as a CO2-free fuel. However, drawbacks of are—low burning speed and nitrogen oxide emissions. To enhance ammonia's flammability atmospheric micro-combustion, hydrogen is blended First, simplified chemical reaction mechanism consisting 44-step reactions 19 species specifically for developed validated using experimental data to reduce computational cost time. Then, we proposed heat-recirculating micro-combustor fueled by premixed hydrogen/ammonia/air. Five key parameters are identical numerically studying thermal performance, entropy generation, NO The present findings confirm that higher inlet velocity boosts performance (power output achieving 15.8 W at 7 m/s) emissions peak 3 m/s (0.0169). Unity equivalence ratio optimizes rich-fuel combustion reduces At stoichiometric ratio, power 8.34 W, with highest 0.9 (0.168). Hydrogen blending has small effect on (8.5 ξm = 0.7, 0.51 above 0.4), but effectively (ξm 0.7 around 30 % lower than 0.4). Furthermore, changing material from steel Corundum enhances approximately 6 %, while longer heat recirculation improves performance.

Language: Английский

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Enhancing thermal and exergy performances in a CO2-Free micro-combustor with reverse flow double-channel outlet structure

Applied Thermal Engineering, Journal Year: 2023, Volume and Issue: 233, P. 121180 - 121180

Published: July 20, 2023

The present study proposes a reverse flow single-channel inlet and double-channel outlet (SIDO) micro-combustor for the analysis of thermal performance nitrogen oxide emission characteristics ammonia/hydrogen-fuelled energy conversion system. Comparison is then made between proposed system conventional single-inlet single-outlet findings indicate that SIDO combustor enhanced performances. Increasing pressure Pin improves exergy efficiency while reducing emissions. velocity Vin can enhance temperature uniformity wall. It also found ammonia combustion convection heat transfer optimized, when = 1.25 m/s. equivalence ratio Φ leads to reduction emissions, has better overall performance, 1.0. Finally, blending ration hydrogen with Φb give rise decayed advection but diffusion, loss (Ploss) be reduced. This confirms viability employing structure thermodynamic performances from micro-combustion systems.

Language: Английский

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Combustion characteristics and emissions of nitrogen oxides (NO, NO2, N2O) from spherically expanding laminar flames of ammonia–hydrogen blends

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 65, P. 164 - 176

Published: April 5, 2024

Language: Английский

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Experimental investigation on combustion and emission characteristics of non-premixed ammonia/hydrogen flame

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 61, P. 25 - 38

Published: Feb. 28, 2024

The use of ammonia and hydrogen as fuels to decarbonise the heavy transport industry has attracted worldwide attention. In this work, a swirl-enhanced combustion test rig been built investigate emission characteristics non-premixed ammonia/hydrogen flames. blowoff limits were first examined ensure that range stable flames could be achieved. Emissions containing nitric oxide (NO), nitrous (NO2), slip (NH3) unburnt (H2) then measured with variety global equivalence ratios, blending inlet gas temperature, swirl numbers chamber insulation conditions. structure relationship between excited hydroxyl radicals (OH*) NO revealed using OH* chemiluminescence profiles. achieved when ratio was greater than 20%. optimal performance under stoichiometric conditions, determined by efficiency. conditions combustor wall played key role in results, significant growth NO2 well reduction found. Although lower number improved flame stability range, increases emissions observed.

Language: Английский

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Review on the ammonia-blend as an alternative fuel for micro gas turbine power generation

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 82, P. 428 - 447

Published: Aug. 1, 2024

Language: Английский

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Investigation on NO emissions and thermal performance of an ammonia/methane-fuelled micro-combustor

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 58, P. 912 - 923

Published: Jan. 30, 2024

To enhance ammonia's flammability, blending methane with ammonia is a viable strategy to improve the laminar burning velocity of combustion. We conducted three-dimensional numerical simulations investigate thermal performance, 2nd thermodynamic law efficiency, and NO emissions micro-combustor fuelled by ammonia/methane. Three key parameters are identified examined. They include: 1) inlet volume flow rate, 2) CH4 mole blended ratio, 3) N2 dilution rate. It found that increasing rate give rise an increase combustor outer wall temperature, so second-law but reduction emissions. For example, when set 14.4 mL/s, temperature efficiency increased 36 % 21 respectively, emission reduced 15 %, in comparison those presence 7.2 mL/s flow. While ratio (molar fraction) shown have limited impact on performances. This variation such be associated notable 22 Additionally, injecting as gas not beneficial performance. However, reduced. When 0.6, 173 K. 47 more observed N_2 being 0.3.

Language: Английский

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Overview of the impact of oxygenated biofuel additives on soot emissions in laboratory scale

Fuel Processing Technology, Journal Year: 2024, Volume and Issue: 254, P. 108046 - 108046

Published: Jan. 30, 2024

Soot has harmful effects on the environment and human health. The formation process of soot includes six steps: fuel pyrolysis, nucleation, coalescence, surface growth, aggregation, oxidation. However, is very complex influenced by factors such as type, combustion conditions, environmental temperature. Oxygenated fuels additives have a positive effect reducing emissions, but recent studies shown that oxygenated can lead to an increase in number small particles soot. In this paper, alcohol, ether, esters emissions discussed terms mechanism formation. Subsequently, role after-treatment systems summarized. This work update our understanding impact emissions.

Language: Английский

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