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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.

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Related in: MedlinePlus

Mass fraction of (a) methane and (b) hydrogen along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) in steady state.
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fig5: Mass fraction of (a) methane and (b) hydrogen along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) in steady state.

Mentions: As shown in Figures 5(a) and 5(b), it can be seen that larger cylinder radius typically increased hydrogen yield. Particularly at sectional position of 3 mm, the mass fraction of hydrogen with cylinder radius of 0.75 mm is 2% higher than that of 0.25 mm, the mass fraction of methane with cylinder radius of 0.25 mm is 7% higher than that of 0.75 mm, indicating that larger cylinder radius results in increase of conversion mainly due to more efficient heat transfer. Rather small differences in mass fraction of methane and hydrogen are observed after 8 mm in steady state. The methane conversion and mass fraction of hydrogen with different radius are reported in Table 4, the effect of cylinder radius can be neglected in steady state. Thus the alteration of the cylinder radius does not affect significantly the outlet conversion and outlet reactor performance, partially for that reactant molecules have enough time to reach the wall before they exit the reactor [18].


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 (a) methane and (b) hydrogen along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) in steady state.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig5: Mass fraction of (a) methane and (b) hydrogen along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) in steady state.
Mentions: As shown in Figures 5(a) and 5(b), it can be seen that larger cylinder radius typically increased hydrogen yield. Particularly at sectional position of 3 mm, the mass fraction of hydrogen with cylinder radius of 0.75 mm is 2% higher than that of 0.25 mm, the mass fraction of methane with cylinder radius of 0.25 mm is 7% higher than that of 0.75 mm, indicating that larger cylinder radius results in increase of conversion mainly due to more efficient heat transfer. Rather small differences in mass fraction of methane and hydrogen are observed after 8 mm in steady state. The methane conversion and mass fraction of hydrogen with different radius are reported in Table 4, the effect of cylinder radius can be neglected in steady state. Thus the alteration of the cylinder radius does not affect significantly the outlet conversion and outlet reactor performance, partially for that reactant molecules have enough time to reach the wall before they exit the reactor [18].

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