Chemical effects of hydrogen addition on low-temperature oxidation of premixed laminar methane/air flames

He, Yonghong; Liang, Mengqing; Liao, Shiyong; Jian, Xiaochun; Shao, Yiming; Jin, Zhao

doi:10.1016/j.fuel.2020.118600

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…It can also be seen that, with the pressure rise, the chemical reaction of H 2 O strengthens the inhibition of the H sensitivity. He et al 9 showed that among OH, H and HO 2 have vital triangular reactions. The main consumption route of HO 2 is R8 (HO 2 + M ⇔ H + OH + M), and the main production route R9 H + O 2 (+M) ⇔ HO 2 (+M).…”

Section: Resultsmentioning

confidence: 99%

“…Li et al investigated the influence of non-premixed ignition of iso-octane with hydrogen addition. Previous studies − have shown that hydrogen addition is in favor of the combustion of hydrocarbon fuels. There are a lot of research on the gasoline surrogate fuels.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, there are many research studies about hydrogen addition on hydrocarbon. − He et al and Liu researched on the hydrogen mixture in methane and dimethyl ether (DME) flames, respectively. He et al found that the reactions between OH, H, and HO 2 were vital reactions for the hydrogen/methane/air combustion process. Liu conducted numerical simulation to explore DME blended with the hydrogen combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…9−16 He et al 9 and Liu 10 researched on the hydrogen mixture in methane and dimethyl ether (DME) flames, respectively. He et al 9 found that the reactions between OH, H, and HO 2 were vital reactions for the hydrogen/methane/air combustion process. Liu 10 conducted numerical simulation to explore DME blended with the hydrogen combustion process.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Combustion Characteristics of Laminar Premixed n-Heptane/Hydrogen/Air Flames at Elevated Pressure

Dong

Xiang

et al. 2020

Energy Fuels

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The simulation results used the CHEMKIN/PREMIX code to explore the combustion characteristics of n-heptane/hydrogen/air flame. The initial temperature is set as 300 K, the pressures are set as 1, 2, 5, 10, and 20 atm, and the equivalence ratios are set as 0.8–1.4. This research mainly focuses on the characteristic of flame, radicals, and temperature sensitivity of the H radical. The results show that the simulation results maintain the consistency of the experimental results, and other mechanism simulation results and the tendency are same. The changes of laminar burning velocity (LBV) are obvious when hydrogen (H2) is mixed, but the influence of H2 addition on adiabatic flame temperature is greater slightly than that on LBV. The sensitivity analysis of the H radical shows that the release of the H radical will compete with n-heptane for oxygen when the H2 doping ratio is increased. With the pressure rise, the chemical reaction of H2O strengthens the inhibition of H sensitivity. Hydrogen addition does not change the main reaction of hydrocarbon fuels. H + O2 ⇔ O + OH and H2O + M ⇔ H + OH + M are also the exothermic reaction and endothermic reactions, respectively, which are the uppermost.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Investigation on Combustion Characteristics of Laminar Premixed n-Heptane/Hydrogen/Air Flames at Elevated Pressure

Dong

Xiang

et al. 2020

Energy Fuels

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“…H 2 is an ideal energy resource because no carbon dioxide or soot is produced in hydrogen combustion. Hydrogen addition in hydrocarbon fuels can reduce the soot emission in diffusion flames − and improve the combustion efficiency , and chemical activity. , Specifically, the experimental investigation of Gülder et al showed that H 2 addition in the fuel stream inhibited soot formation chemically in a C 2 H 4 /air laminar coflow flame. However, this chemical inhibition effect of H 2 addition did not exist in C 3 H 8 /air and C 4 H 10 /air flames.…”

Section: Introductionmentioning

confidence: 99%

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

et al. 2021

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The effects of adding acetylene to the fuel stream on soot formation and flame properties were investigated numerically in a laminar axisymmetric coflow ethylene/air diffusion flame using the open-source flame code Co-Flame in conjunction with an elementary gas-phase chemistry scheme and detailed transport and thermodynamic database. Radiation heat transfer of the radiating gases (H 2 O, C 2 H 2 , CO, and CO 2 ) and soot was calculated using a statistical narrow-band correlated- k -based wide band model coupled with the discrete-ordinates method. The soot formation was described by the consecutive steps of soot nucleation, surface growth of soot particles via polycyclic aromatic hydrocarbons (PAHs)-soot condensation or the hydrogen abstraction acetylene addition (HACA) mechanism, and soot oxidation. The added acetylene affected the flame structure and soot concentration through not only chemical reactions among different species but also radiation effects. The chemical effect due to the added acetylene had a significant impact on soot formation. Specifically, it was confirmed that the addition of 10% acetylene caused an increase in the peak soot volumetric fraction (SVF) by 14.9% and the peak particle number density by about 21.1% ( z = 1.5 cm). Furthermore, increasing acetylene concentration led to higher concentrations of propargyl, benzene, and PAHs and consequently directly enhanced soot nucleation rates. In addition, the increased H mole fractions also accentuated the soot surface growth. In contrast, the radiation effect of the addition of 10% acetylene was much weaker, resulting in slightly lower flame temperature and SVF, which in turn reduced the radiant heat loss.

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Effects of hydrogen mixing ratio on combustion and emissions of natural gas‐diesel dual fuel engine with high natural gas substitution rate

Guo

Xia

et al. 2023

Env Prog and Sustain Energy

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In order to explore the feasibility of natural gas (NG)/diesel dual‐fuel engine with high NG substitution rate under medium and low load, the effects of hydrogen (H2) on the performance and emissions of the engine are studied numerically. The baseline engine is a four‐cylinder turbocharged diesel engine, which is modified into a diesel‐Natural Gas‐Hydrogen ternary fuels engine with port‐injected H2 and NG fuels and direct‐injected diesel fuel. The simulation is performed using GT‐Power software, and numerical results are validated with the experimental data. The percentage of diesel fuel is set at 10% and 20% (by energy). The engine speed decreases from high speed to medium speed and finally to low speed. The engine load decreases from medium load to low load. The H2 mixing ratio increases from 10% to 50%. The results show that, with the increase of H2 mixing ratio, the peak cylinder pressure (PCP), the peak cylinder temperature (PCT), the heat release rate (HRR) and the maximum pressure rise rate (MPRR) increase, while the indicated thermal efficiency (ITE) decreases under all working conditions. Among them, the MPRR increases by 4%~13% at medium load and 1%~2% at low load, but it does not exceed 0.6 MPa/ (°) CA. The indicated thermal efficiency decreases by 1%~4% at medium and low load. In terms of emissions, the carbon monoxide (CO) and the hydrocarbons (HC) decrease by 34%~43%, but the nitrogen oxide (NOX) increases by 58%~73%.

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Chemical effects of hydrogen addition on low-temperature oxidation of premixed laminar methane/air flames

Cited by 18 publications

References 34 publications

Numerical Investigation on Combustion Characteristics of Laminar Premixed n-Heptane/Hydrogen/Air Flames at Elevated Pressure

Numerical Investigation on Combustion Characteristics of Laminar Premixed n-Heptane/Hydrogen/Air Flames at Elevated Pressure

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

Effects of hydrogen mixing ratio on combustion and emissions of natural gas‐diesel dual fuel engine with high natural gas substitution rate

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