Numerical comparison study of methane catalytic combustion characteristic between newly proposed opposed counter-flow micro-combustor and the conventional ones

Yan, Yunfei; Wu, Gange; Huang, Weipeng; Zhang, Li; Li, Lixian; Yang, Zhongqing

doi:10.1016/j.energy.2018.12.114

Cited by 65 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In (11), if the linear relationship between ln r and 1/T can be fitted, then the slope of the line is solved. After further calculation, the apparent activation energy E can be obtained.…”

Section: Reaction Kinetics Testmentioning

confidence: 99%

“…Ethylene is one of the most produced and essential chemical products in the world [1][2][3]. Oxydehydrogenation of C 2 H 6 with CO 2 to C 2 H 4 provides new ideas for pressing issues (energy conservation and emission reduction, green chemical industry, sustainable development) [4][5][6][7][8][9][10][11][12]. The reaction not only promotes the comprehensive utilization of natural gas [13], but also overcomes the shortcomings (high pollution and high energy consumption) of hightemperature pyrolysis of petroleum to ethylene [14,15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Wang¹,

Wang²,

Yang³

et al. 2020

Comptes Rendus. Chimie

Self Cite

View full text Add to dashboard Cite

Single metal catalysts with different active components (La, Sm, Ce) and La loadings (5%, 10%, 15%) were prepared. Oxydehydrogenation of C 2 H 6 with CO 2 over the above catalysts was studied by catalyst activity experiments and characterization tests. The results indicate that the homogeneous reaction of CO 2 /C 2 H 6 is the coupling of ethane pyrolysis and hydrogenolysis. Dehydrogenation has better selectivity than reforming on La/Sm/Ce-based catalysts; Sm exhibits the best catalytic activity due to carbon deposition resistance and many oxygen vacancies. C 2 H 6 conversion on 10% Sm/SiO 2 is 42.75% at 700°C, but C 2 H 4 selectivity is lowest. Because of the existence of Ce 4+ , Ce has the best C 2 H 4 selectivity; it has potential to modify the catalyst, but its catalytic activity is lowest. La shows the best catalytic performance. The activation energy on 10% La/SiO 2 is 83.99 kJ/mol, C 2 H 4 selectivity is 96.84% at 700°C, and its optimum loading is between 10% and 15%.

show abstract

“…In (11), if the linear relationship between ln r and 1/T can be fitted, then the slope of the line is solved. After further calculation, the apparent activation energy E can be obtained.…”

Section: Reaction Kinetics Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Wang¹,

Wang²,

Yang³

et al. 2020

Comptes Rendus. Chimie

Self Cite

View full text Add to dashboard Cite

show abstract

“…Increasing the effective heat loss coefficient decreases the critical blowout velocity. Yan et al 13 numerically examined the catalytic combustion characteristics of methane/air in opposed counter-flow micro combustion chamber with special multi-step separated baffles and planer micro combustion chamber. It was shown that opposed counter-flow micro combustion chamber significantly expands the inlet velocity limits for stable combustion.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the blow-off limit of premixed hydrogen/air flames in a cylindrical micro-combustor

Naeemi

Hashemi

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

In the current work, a numerical study on combustion of premixed H2–air in a micro-cylindrical combustor was carried out and the critical velocity of inlet flow that causes the blow-off was obtained. Furthermore, the effects the equivalence ratio, wall thickness, geometry of combustor and thermal properties of walls on the critical blow-off velocity were studied. The numerical results showed that, increasing the equivalence ratio results in higher critical blow-off velocity. A micro combustor with thicker wall had better flame stability. As the combustor dimeter is decreased the blow-off occur in lower inlet flow velocity. Higher thermal conductivity of walls increases the critical blow-off velocity. In addition, with varying heat convection coefficient (h) and emissivity coefficient [Formula: see text] of the walls from 1 to 60 W/m2.K and 0.2 to 0.8 respectively, the critical blow-off velocity is reduced and shows the importance of wall thermal properties in the design and operation of micro-combustors.

show abstract

“…Micro-electro-mechanical system (MEMS) technology has received considerable attention in recent years [1][2][3]. Micropower generation devices based on combustion has several advantages, such as light weight, high-power density, long charge duration, and short recharging time [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Combustion in an Improved Microcombustion Chamber with Rib

Chen

Liu

2019

Journal of Chemistry

View full text Add to dashboard Cite

This study proposes an improved microcombustor with a rectangular rib to improve the temperature level of the combustor wall. Moreover, the OH mass fraction, temperature distribution, and outer wall temperature of the original and improved combustors of premixed hydrogen/air flames are numerically investigated under various inlet velocities and equivalence ratios. Results show that the improved microcombustor enhances heat transfer between the mixture and wall because its recirculation zone is larger than that of the original, thereby resulting in high wall temperature. Conversely, thermal resistance in the horizontal direction increases with upstream and downstream step lengths. Consequently, the outer wall temperature decreases with step length in the improved combustor. A high equivalence ratio (e.g., 0.6) may result in the destruction of the combustor because the wall temperature has exceeded the acceptable temperature of wall material quartz. Therefore, the improved microcombustor is recommended for micro-thermo-photovoltaic systems.

show abstract

Numerical comparison study of methane catalytic combustion characteristic between newly proposed opposed counter-flow micro-combustor and the conventional ones

Cited by 65 publications

References 30 publications

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

A numerical study on the blow-off limit of premixed hydrogen/air flames in a cylindrical micro-combustor

Numerical Investigation of the Combustion in an Improved Microcombustion Chamber with Rib

Contact Info

Product

Resources

About