A numerical study on the combustion limits of mesoscale methane jet flames with hydrogen addition

Hou, Bin; Fan, Aiwu

doi:10.1016/j.ijhydene.2022.07.018

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…The reason is that the process is a homogeneous ignition reaction, and the gas phase components in the coal burn first to ignite the coal seam 54 . The occurrence of a homogeneous ignition reaction depends on the combustion limit (c0) and activation energy (T0) 55 . When hot oxygen is introduced into the coal seam, the coal seam near the gas injection port (Coal1) will precipitate some volatiles and generate free radicals under the action of oxygen and temperature, and the free radicals will further form tar vapor.…”

Section: Resultsmentioning

confidence: 99%

“…54 The occurrence of a homogeneous ignition reaction depends on the combustion limit (c0) and activation energy (T0). 55 When hot oxygen is introduced into the coal seam, the coal seam near the gas injection port (Coal1) will precipitate some volatiles and generate free radicals under the action of oxygen and temperature, and the free radicals will further form tar vapor. The ignition point of the component, and when the component reaches the concentration required for the flammability limit, the component will burn and ignite other components so that the coal seam releases more volatiles and is finally ignited.…”

Section: Analysis Of the Mechanism Of Coal Ignitionmentioning

confidence: 99%

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Pure oxygen condition forced oxidation ignition process of underground coal gasification

Liang

Zhao

et al. 2023

Asia-Pacific J Chem Eng

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Underground coal gasification without shaft is a technology that uses directional drilling technology to gasify deeply buried coal. The technology first needs to ignite the coal seam during drilling, but as the depth of the coal seam (drilling) increases, it is very difficult to ignite the underground coal seam. In order to ignite the underground coal seam more safely and effectively, the forced oxidation ignition technology has been developed; that is, the coal seam is heated by hot oxygen, and the coal seam is rapidly oxidized and released to ignite the coal seam. Due to the complex confidential environment, it is challenging to ignite underground coal seams. To ignite the underground coal seams more safely and effectively, this paper used a self-made reactor to simulate the forced convection heating of the bituminous coal under different oxygen flow rates with hot oxygen and used a Fourier transform infrared spectrometer flue gas analyzer to detect the outlet gas, used ATR-FTIR spectrometer to analyze the solid residues in different areas, and recorded the time and maximum temperature of coal ignition under other processes. The results showed that low-flow high-temperature oxygen could quickly burn coal seams.When the oxygen flow rate was 2.5 m 3 /h, and the coal seam was ignited when heated to 130 C for 170 min. Through GC-MS analysis of nine flammable components in the tar components under different processes, the content of shortchain aliphatic hydrocarbons in the tar decreases, and the content of benzene series tends to increase. Through ATR-FTIR analysis, the solid sample near the gas injection port contained fewer oxygen functional groups; the middle of the furnace body included the most oxygen functional groups; near the gas outlet contained more oxygen functional groups than the raw coal. CO 2 would rise to 3% when coal was about to ignite.

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of the Mechanism Of Coal Ignitionmentioning

confidence: 99%

Pure oxygen condition forced oxidation ignition process of underground coal gasification

Liang

Zhao

et al. 2023

Asia-Pacific J Chem Eng

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“…Hou et al [32] studied the effect of hydrogen addition (up to 25%) for methane meso-scale combustion and observed that the combustible range is significantly enhanced. Additionally, the combustion reaction was enhanced and the blow-off limit was extended due to the improved chemical effect.…”

Section: Introductionmentioning

confidence: 99%

Impact of H2 Blending of Methane on Micro-Diffusion Combustion in a Planar Micro-Combustor with Splitter

Sudarsanan,

Velamati,

Alquaity

et al. 2024

Energies

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An investigation into the non-premixed combustion characteristics of methane in a planar micro-combustor with a splitter was performed. The impact of blending methane with hydrogen on these characteristics was also analyzed. Additionally, the effects of inlet velocity and global equivalence ratio on flame location, flame temperature, combustion efficiency and outer wall temperature were studied for three different fuel compositions: pure methane (MH0), 60% methane with 40% hydrogen (MH40), and 40% methane with 60% hydrogen (MH60)). A heat recirculation analysis of the combustor wall was conducted to determine the amount of heat recirculated into the unburnt gas at various inlet velocities for all three fuel compositions. The results demonstrated that the stability limit of methane in terms of inlet velocity (1–2 m/s) and global equivalence ratio (1.0–1.2) was significantly enhanced to 1–3 m/s and 0.8–1.2, respectively, with the addition of hydrogen. At an inlet velocity of 2 m/s, the flame location of 3.6 mm for MH0 was significantly improved to 2.2 mm for MH60. Additionally, outer wall temperature exhibited a rise of 100 K for MH60 compared to MH0. Furthermore, from heat recirculation analysis, when the ratio of heat recirculated to heat loss exceeded unity, the flame started exhibiting the lift-off phenomenon for all the fuel compositions.

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Experimental analysis and multi-objective optimization of flame dynamics and combustion performance in methane-fueled slit-type combustors

Gao,

Tang,

Cai

et al. 2024

Applied Energy

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A numerical study on the combustion limits of mesoscale methane jet flames with hydrogen addition

Cited by 9 publications

References 34 publications

Pure oxygen condition forced oxidation ignition process of underground coal gasification

Pure oxygen condition forced oxidation ignition process of underground coal gasification

Impact of H2 Blending of Methane on Micro-Diffusion Combustion in a Planar Micro-Combustor with Splitter

Experimental analysis and multi-objective optimization of flame dynamics and combustion performance in methane-fueled slit-type combustors

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