Measurement of the laminar burning velocities and markstein lengths of lean and stoichiometric syngas premixed flames under various hydrogen fractions

Li, Hong‐Meng; Li, Guo-Xiu; Sun, Zuo-Yu; Zhai, Yue; Zhou, Zi-Hang

doi:10.1016/j.ijhydene.2014.07.177

Cited by 46 publications

(12 citation statements)

References 54 publications

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“…However, slightly higher CO emissions were observed for high CO 2 diluents ratio (20% and 25%), as shown in Higher H 2 content in the mixture leads to higher mixture reactivity rate which increases flame speed and reduces chemical time for complete reactions [22]. The relative high flame speed of H 2 -rich syngases delays blowout phenomena as the velocity of the incoming unburnt reactants matches those of the flames to enable stabilisation of flame at the burner outlet [40][41][42][43]. With higher H 2 fraction in syngas, the additional H 2 in the free stream increases the concentration of radicals, thus increases the mixture's reactivity [44].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Samiran

Jaafar

et al. 2016

International Journal of Hydrogen Energy

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The combustion performance of H 2-rich model syngas was investigated by using a premixed swirl flame combustor. Syngas consisting mainly of H 2 and CO was blended with components such as CH 4 and CO 2 in a mixing chamber prior to combustion at atmospheric condition. The global flame appearance and emissions performance were examined for high (H 2 /CO = 3) and moderate (H 2 /CO = 1.2) H 2-rich syngases. Results showed that higher H 2 fractions in the syngases produce lower NO x emissions per kWh basis across all equivalence ratios tested. CO emissions are equivalence ratio dependent and are less affected by the H 2 fraction in the syngas. Increasing CO 2 diluent ratios result in the decrease of NO x , particularly for moderate H 2-rich syngases. In contrast, syngas without CO shows an increase of NO x with increasing CO 2 for fuel-lean mixtures. Addition of CO 2 increases the lean blowout limit of all syngases. Higher fraction of H 2 produces lower lean blowout limits due to the characteristics of high diffusivity of hydrogen molecules and high flame speed that assist in the stabilisation of the flame under flame-lean conditions. The range of blowout limits for moderate and high H 2-rich and pure hydrogen syngases under diluent ratios up to 25% were within the range of φ = 0.12-0.15.

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Section: Accepted Manuscriptmentioning

confidence: 99%

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Samiran

Jaafar

et al. 2016

International Journal of Hydrogen Energy

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“…The chemical and physical properties of fuel influence the measurements uncertainties through possible reactions with devices and phase change. If the fuel is CO, the interaction of CO and the material of the gas cylinder wall can produce nickel carbonyl or iron carbonyl [63,64]. Considering that the flowing oscillation can lead to undesired changes in equivalence ratio and liquid fuels face a stronger oscillation than gaseous fuels due to the difference of supply system, there is a higher inaccuracy for liquid fuels than gaseous fuels, which are 0.5% and 0.2% for liquid and gaseous fuels respectively [61,62].…”

Section: Common Uncertainty Sourcesmentioning

confidence: 99%

Experimental error assessment of laminar flame speed measurements for digital chemical kinetics databases

Walter

Wang

Kanz

et al. 2020

Fuel

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This paper focuses on the uncertainty sources in experimental techniques applied for laminar flame speed measurements. The work was motivated due to the necessity to develop flexible standard sets of the key experimental parameters and descriptors to be included in the machine-readable files of digitalized data repositories such as ReSpeTh, PriMe, CloudFlame, etc. Besides identifying and making the data findable through the associated parameterized descriptions, available information should be interoperable with numerical codes evaluating uncertainty of experimental data. These uncertainty boundaries are very important for interpreters of the data and for development of statistical methods applied for the kinetic model optimization. On this way, four most common used techniques -Heat Flux Method (HFM), Bunsen Flame Method (BFM), Spherical Flame Method (SFM) and CounterFlow Method (CFM) were analyzed. The possible sources of experimental uncertainties have been investigated using data published by different research groups. Respective principles and structures of the experimental uncertainty sources for each studied method have been described.The uncertainty sources, their parameters and descriptors have been classified and systematically summarized in a universal data set to be used in the XML files of digitalized data repositories.

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“…Relevant data support and engineering reference are provided for revealing the influence of the coupling mechanism of initial parameters on the laminar burning process, which is of great significance. Figure 1 is a schematic of the test system, which is mainly composed of a constant volume chamber (CVC), a temperature monitoring system, an ignition system, a data acquisition system and a Schlieren imaging system [15]. The temperature monitoring system includes a K-Type thermocouple and a proportional-integral-derivative (PID) temperature controller, which is capable of maintaining the Tu error within ±3 k. The parameters of the ignition system are as follows: the ignition voltage is 14 V, provided by a stabilized power supply; the ignition pulse width is 3 ms; the ignition electrode diameter is 2 mm; and the gap between the ignition electrodes is 3 mm.…”

Section: Introductionmentioning

confidence: 99%

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

Wang

Zhu

et al. 2021

Energies

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Initial temperature has a promoting effect on laminar burning velocity, while initial pressure and dilution rate have an inhibitory effect on laminar burning velocity. Equal laminar burning velocities can be obtained by initial condition coupling with different temperatures, pressures and dilution rates. This paper analysed the equivalent distribution pattern of laminar burning velocity and the variation pattern of an equal weight curve using the coupling effect of the initial pressure (0.1–0.3 MPa), initial temperature (323–423 K) and dilution rate (0–16%). The results show that, as the initial temperature increases, the initial pressure decreases and the dilution rate decreases, the rate of change in laminar burning velocity increases. The equivalent effect of initial condition coupling can obtain equal laminar burning velocity with an dilution rate increase (or decrease) of 2% and an initial temperature increase (or decrease) of 29 K. Moreover, the increase in equivalence ratio leads to the rate of change in laminar burning velocity first increasing and then decreasing, while the increases in dilution rate and initial pressure make the rate of change in laminar burning velocity gradually decrease and the increase in initial temperature makes the rate of change in laminar burning velocity gradually increase. The area of the region, where the initial temperature influence weight is larger, gradually decreases as the dilution rate increases, and the rate of decrease gradually decreases.

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Measurement of the laminar burning velocities and markstein lengths of lean and stoichiometric syngas premixed flames under various hydrogen fractions

Cited by 46 publications

References 54 publications

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Experimental error assessment of laminar flame speed measurements for digital chemical kinetics databases

The Equivalent Effect of Initial Condition Coupling on the Laminar Burning Velocity of Natural Gas Diluted by CO2

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