Explosion pressure and flame characteristics of CO/CH4/air mixtures at elevated initial temperatures

Luo, Zhenmin; Li, Ruikang; Wang, Tao; Cheng, Fangqin; Liu, Yin; Yu, Zhonghua; Fan, Shixing; Zhu, Xiaochun

doi:10.1016/j.fuel.2020.117377

Cited by 66 publications

(21 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has the largest thermal weight loss due to maximum gaseous release in the temperature range of 450 °C to 600 °C [28] . The as‐released gas is mainly composed of light hydrocarbons, nitrogen‐containing hydrocarbons, CO 2 , CO and H 2 [28–30] . Hence, we design that the first‐stage zone stays at 600 °C for 90 mins in order to slowly release the gas derived from coal pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Cong

Yang²,

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

The N‐doped porous carbon (NPC) /carbon micro‐nanotubes (CMNT) /NixCoyOz nanosheets with rich mesopores and 1.37 wt% nitrogen doping are successfully synthesized by a pyrolysis‐ionization‐precipitation combination process, using coal‐based polyaniline and nickelocene as original materials. Therein, most of the CMNT are upright CMTs and worm‐like curved CNTs, and a few are bamboo‐like tubes or carbon nanofibers. Moreover, many flower‐like aggregates assembled by spinel NiCo2O4 nanosheets are anchored on the surface of the NPC and CMNT. The NPC/CMNT/NixCoyOz exhibits a high specific capacitance and cycling stability, attributed to the large BET specific surface area (485 m2/g), suitable BET average pore size (2.3 nm), good hydrophilicity and wettability, and synergistic effects among three components. The assembled NPC/CMNT/NixCoyOz//AC asymmetric supercapacitor also demonstres a high specific capacitance of 120 F g−1 at a current density of 1 A g−1 and a high energy density of 16.7 Wh kg−1 at a power density of 500 W kg−1.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Cong

Yang²,

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…The chemical reaction mechanism simulation was calculated using the GRI-Mech3.0 reaction mechanism, and the calculation used a closed homogeneous 0-D reaction model 30 . The reactor was adiabatic.…”

Section: Experimental Equipment and Research Methodsmentioning

confidence: 99%

Influence of acetylene on methane–air explosion characteristics in a confined chamber

Jia

Zhu

Niu³

et al. 2021

Sci Rep

View full text Add to dashboard Cite

To study the impact of acetylene on methane explosions, the safe operation of coal mines should be ensured. In this paper, a 20 L spherical tank was used to study the explosive characteristics of acetylene–methane–air mixture. In addition, the GRI-Mech3.0 mechanism was used to study the chemical kinetic mechanism for the mixed gas, and the effect of adding acetylene on the sensitivity of methane and the yield of free radicals was analysed. The results show that acetylene can expand the scope for methane explosion, lower the lower explosion limit, and increase the risk of explosion. Acetylene increases the maximum explosion pressure, laminar combustion rate and maximum pressure rise rate for the methane–air mixture while shortening the combustion time. Three combustion modes for the acetylene–methane–air mixture were determined: methane-dominated, transitional and acetylene-dominated combustion modes. Chemical kinetic analysis for the mixed gas shows that as the volume fraction of acetylene increases, the generation rate for key free radicals (H*, O* and OH*) gradually increases, thereby increasing the intensity of the explosive reaction. The results from this research will help formulate measures to prevent coal mine explosion accidents.

show abstract

“…Similarly, Xiao et al [17] had researched on the effects of opening ratio about flame characteristics, when opening ratio is less than 0.075, there will be obvious tulip distortions, and with the decrease of the opening ratio, the growth rate of the pipe pressure and oscillation amplitude increases, along with the rising of the opening ratio, the tulip flame and distorted tulips cutting-edge position also will increase. Otherwise, there are many researches on the flame characteristics of syngas tulip in pipe [18][19][20], this work is based on the predecessors.…”

Section: Introductionmentioning

confidence: 99%

The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

et al. 2021

View full text Add to dashboard Cite

To further understand the combustion characteristics of syngas/air, the behaviors of premixed flame at various hydrogen additions and opening ratios were investigated. The combustion vessel is a half-open rectangular duct 50mm square by 900mm long. The shape of the flame is photographed by a high-speed camera and the pressure is measured by a pressure sensor at the closed end of the duct. The effect of the two variables on the flame dynamics are considered through the analysis of the flame shape evolution and the overpressure oscillation. The results show that the tulip flame appeared earlier and the overpressure peak reach the maximum under the condition of 30% hydrogen fraction; with increasing of the opening ratio, the tulip flame appeared later and the overpressure peak gradually decreased. Under the experimental conditions of the opening with the increase of the volumes of hydrogen blend ratio, the overpressure peak increased systematically, but the occurrence time fluctuated. The results show that the influence of the opening ratio and the hydrogen blend ratio pressures is mainly impacted when the hydrogen blend ratio is at least 30%,with a 0.25 opening ratio. At these critical parameters, the overpressure peak reaches a maximum of 0.9bar;when the opening ratio is 0.5, the overpressure peak suddenly dropped to 0.39bar.

show abstract

Explosion pressure and flame characteristics of CO/CH4/air mixtures at elevated initial temperatures

Cited by 66 publications

References 55 publications

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Influence of acetylene on methane–air explosion characteristics in a confined chamber

The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

Contact Info

Product

Resources

About

Explosion pressure and flame characteristics of CO/CH4/air mixtures at elevated initial temperatures

Cited by 66 publications

References 55 publications

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/NixCoyOz Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/NixCoyOz Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Influence of acetylene on methane–air explosion characteristics in a confined chamber

The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

Contact Info

Product

Resources

About

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors

Synthesis of N‐Doped Porous Carbon/Carbon Micro‐Nanotubes/Ni_xCo_yO_z Nanosheets as a High‐Capacity Electrode Material for Supercapacitors