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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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Mass fraction of methane along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) at reaction time of 3 s.
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fig3: Mass fraction of methane along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) at reaction time of 3 s.

Mentions: The numerical analysis has been carried out in order to verify the effect of cylinder radius (0.25 mm, 0.50 mm, and 0.75 mm) on reforming reaction. As shown in Figure 3, the mass fraction of methane decreases from 26% to 21% with cylinder radius of 0.75 mm at 3 s, while cylinder radius of 0.50 mm and 0.25 mm decreases to 23.5% and 25.3%, indicating that larger cylinder radius (from 0.25 mm to 0.75 mm) promotes the reactor performance. The methane conversion with different cylinder radius generally achieves 97% (see Figure 4) with operating temperature of 1190 K, higher than the conventional research [8, 19], partially due to the adjusted temperature profile and reaction heat flux caused by catalytic cylinders. Larger cylinder radius corresponds to more catalytic surface and the time to steady state reaction is decreased from 50 s to 30 s. Hence, expanding the cylinder radius is one option to improve reforming performance, subject to limited physical size of micro-chamber reactor.


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 radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) at reaction time of 3 s.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: Mass fraction of methane along sectional position with cylinder radius of 0.25 mm (■), 0.50 mm (●), and 0.75 mm (▲) at reaction time of 3 s.
Mentions: The numerical analysis has been carried out in order to verify the effect of cylinder radius (0.25 mm, 0.50 mm, and 0.75 mm) on reforming reaction. As shown in Figure 3, the mass fraction of methane decreases from 26% to 21% with cylinder radius of 0.75 mm at 3 s, while cylinder radius of 0.50 mm and 0.25 mm decreases to 23.5% and 25.3%, indicating that larger cylinder radius (from 0.25 mm to 0.75 mm) promotes the reactor performance. The methane conversion with different cylinder radius generally achieves 97% (see Figure 4) with operating temperature of 1190 K, higher than the conventional research [8, 19], partially due to the adjusted temperature profile and reaction heat flux caused by catalytic cylinders. Larger cylinder radius corresponds to more catalytic surface and the time to steady state reaction is decreased from 50 s to 30 s. Hence, expanding the cylinder radius is one option to improve reforming performance, subject to limited physical size of micro-chamber reactor.

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