Limits...
Effect of catalytic cylinders on autothermal reforming of methane for hydrogen production in a microchamber reactor.

Yan Y, Guo H, Zhang L, Zhu J, Yang Z, Tang Q, Ji X - ScientificWorldJournal (2014)

Bottom Line: A new multicylinder microchamber reactor is designed on autothermal reforming of methane for hydrogen production, and its performance and thermal behavior, that is, based on the reaction mechanism, is numerically investigated by varying the cylinder radius, cylinder spacing, and cylinder layout.The results show that larger cylinder radius can promote reforming reaction; the mass fraction of methane decreased from 26% to 21% with cylinder radius from 0.25 mm to 0.75 mm; compact cylinder spacing corresponds to more catalytic surface and the time to steady state is decreased from 40 s to 20 s; alteration of staggered and aligned cylinder layout at constant inlet flow rates does not result in significant difference in reactor performance and it can be neglected.The results provide an indication and optimize performance of reactor; it achieves higher conversion compared with other reforming reactors.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China ; College of Power Engineering, Chongqing University, Chongqing 400030, China.

ABSTRACT
A new multicylinder microchamber reactor is designed on autothermal reforming of methane for hydrogen production, and its performance and thermal behavior, that is, based on the reaction mechanism, is numerically investigated by varying the cylinder radius, cylinder spacing, and cylinder layout. The results show that larger cylinder radius can promote reforming reaction; the mass fraction of methane decreased from 26% to 21% with cylinder radius from 0.25 mm to 0.75 mm; compact cylinder spacing corresponds to more catalytic surface and the time to steady state is decreased from 40 s to 20 s; alteration of staggered and aligned cylinder layout at constant inlet flow rates does not result in significant difference in reactor performance and it can be neglected. The results provide an indication and optimize performance of reactor; it achieves higher conversion compared with other reforming reactors.

Show MeSH

Related in: MedlinePlus

Mass fraction of methane along sectional position with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) at reaction time of 5 s (a) and 25 s (b).
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4109667&req=5

fig6: Mass fraction of methane along sectional position with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) at reaction time of 5 s (a) and 25 s (b).

Mentions: Figures 6(a) and 6(b) show results of a series of numerical simulations. Mass fraction of methane with cylinder spacing of 0.7, 0.9, and 1.1 mm are plotted on sectional position along reactor length at reaction time of 5 s and 25 s. Mass fraction of methane generally decreases from 26% to 16% (see Figure 6(a)) and coincides at 3 mm (reaction time of 5 s). After that methane mass fraction with cylinder spacing of 0.7 mm decreases from 16% to 7%, while the spacing of 0.9 mm and 1.1 mm moves downstream to 14% and 10%, this indicates that a decrease in cylinder spacing (from 1.1 mm to 0.7 mm) promotes the reactor performance at outlet section. As a contrast, the same alteration of cylinder spacing is made and mass fraction of methane is approaching at reaction time of 25 s (see Figure 6(b)), partially due to fully developed and adjusted flow field and temperature profile, thus rather small differences are observed after 3 mm.


Effect of catalytic cylinders on autothermal reforming of methane for hydrogen production in a microchamber reactor.

Yan Y, Guo H, Zhang L, Zhu J, Yang Z, Tang Q, Ji X - ScientificWorldJournal (2014)

Mass fraction of methane along sectional position with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) at reaction time of 5 s (a) and 25 s (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4109667&req=5

fig6: Mass fraction of methane along sectional position with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) at reaction time of 5 s (a) and 25 s (b).
Mentions: Figures 6(a) and 6(b) show results of a series of numerical simulations. Mass fraction of methane with cylinder spacing of 0.7, 0.9, and 1.1 mm are plotted on sectional position along reactor length at reaction time of 5 s and 25 s. Mass fraction of methane generally decreases from 26% to 16% (see Figure 6(a)) and coincides at 3 mm (reaction time of 5 s). After that methane mass fraction with cylinder spacing of 0.7 mm decreases from 16% to 7%, while the spacing of 0.9 mm and 1.1 mm moves downstream to 14% and 10%, this indicates that a decrease in cylinder spacing (from 1.1 mm to 0.7 mm) promotes the reactor performance at outlet section. As a contrast, the same alteration of cylinder spacing is made and mass fraction of methane is approaching at reaction time of 25 s (see Figure 6(b)), partially due to fully developed and adjusted flow field and temperature profile, thus rather small differences are observed after 3 mm.

Bottom Line: A new multicylinder microchamber reactor is designed on autothermal reforming of methane for hydrogen production, and its performance and thermal behavior, that is, based on the reaction mechanism, is numerically investigated by varying the cylinder radius, cylinder spacing, and cylinder layout.The results show that larger cylinder radius can promote reforming reaction; the mass fraction of methane decreased from 26% to 21% with cylinder radius from 0.25 mm to 0.75 mm; compact cylinder spacing corresponds to more catalytic surface and the time to steady state is decreased from 40 s to 20 s; alteration of staggered and aligned cylinder layout at constant inlet flow rates does not result in significant difference in reactor performance and it can be neglected.The results provide an indication and optimize performance of reactor; it achieves higher conversion compared with other reforming reactors.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China ; College of Power Engineering, Chongqing University, Chongqing 400030, China.

ABSTRACT
A new multicylinder microchamber reactor is designed on autothermal reforming of methane for hydrogen production, and its performance and thermal behavior, that is, based on the reaction mechanism, is numerically investigated by varying the cylinder radius, cylinder spacing, and cylinder layout. The results show that larger cylinder radius can promote reforming reaction; the mass fraction of methane decreased from 26% to 21% with cylinder radius from 0.25 mm to 0.75 mm; compact cylinder spacing corresponds to more catalytic surface and the time to steady state is decreased from 40 s to 20 s; alteration of staggered and aligned cylinder layout at constant inlet flow rates does not result in significant difference in reactor performance and it can be neglected. The results provide an indication and optimize performance of reactor; it achieves higher conversion compared with other reforming reactors.

Show MeSH
Related in: MedlinePlus