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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

Methane conversion with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) for different reaction time.
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Related In: Results  -  Collection


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fig8: Methane conversion with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) for different reaction time.

Mentions: As shown in Figure 7, alteration of cylinder spacing leads to no significant difference in steady state. It illustrates that the spacing of cylinders has no significant effect on the final state of reaction. The present work achieves a methane conversion of 95% (see Figure 7); it generally higher than improved performance of 91% and 93% conversion in previous experimental research [20, 21] (inlet flow rate 0.75 and 2; temperature of feed 873 K and 943 K), partially due to higher operating temperature. As shown in Figure 8, larger cylinder spacing results in higher conversion and the time to steady state is decreased (from 40 s to 20 s). The cylinder spacing is concerned with catalyst loading and more reactants contact catalytic surface with compact cylinder spacing. The methane conversion of cylinder spacing varied in Figure 8 approaches in steady state, indicating that the parameter is unlikely to optimize performance for the steady state reaction. The result also shows that operating temperature is the major factor limiting reforming performance; thus, a cooler reactor leads to lower final conversions.


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)

Methane conversion with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) for different reaction time.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig8: Methane conversion with cylinder spacing of 0.7 mm (■), 0.9 mm (●), and 1.1 mm (▲) for different reaction time.
Mentions: As shown in Figure 7, alteration of cylinder spacing leads to no significant difference in steady state. It illustrates that the spacing of cylinders has no significant effect on the final state of reaction. The present work achieves a methane conversion of 95% (see Figure 7); it generally higher than improved performance of 91% and 93% conversion in previous experimental research [20, 21] (inlet flow rate 0.75 and 2; temperature of feed 873 K and 943 K), partially due to higher operating temperature. As shown in Figure 8, larger cylinder spacing results in higher conversion and the time to steady state is decreased (from 40 s to 20 s). The cylinder spacing is concerned with catalyst loading and more reactants contact catalytic surface with compact cylinder spacing. The methane conversion of cylinder spacing varied in Figure 8 approaches in steady state, indicating that the parameter is unlikely to optimize performance for the steady state reaction. The result also shows that operating temperature is the major factor limiting reforming performance; thus, a cooler reactor leads to lower final conversions.

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