Simulation of Methanol Steam Reforming Heated by Waste Heat for Hydrogen Production in a Microreactor

2011 ◽  
Vol 216 ◽  
pp. 718-722
Author(s):  
Feng Wang ◽  
Jing Zhou ◽  
Guo Qiang Wang ◽  
Xin Jing Zhou
Keyword(s):  
Steam Reforming ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Waste Heat ◽  
Catalyst Loading ◽  
Methanol Steam Reforming ◽  
Rate Model ◽  
Reactor Outlet ◽  
Catalytic Surface ◽  
Design And Optimization

In order to intensify the process of methanol steam reforming and improving the heating supply process by waste heat, the effect of evenly and interrupted distributed catalytic surface was studied on H2 content at reactor outlet. With the application of general finite reaction rate model in CFD software of FLUENT, we carried out 3-D simulation of this process. Results show that, outlet H2 content can be increased through interrupted distributed catalytic surface with the same catalyst loading. This result can be used to provide the basis for surface reaction design and optimization in microreactor.

scholarly journals Performance Study on Methanol Steam Reforming Rib Micro-Reactor with Waste Heat Recovery

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1564 ◽  
Author(s):  
Guoqiang Wang ◽  
Feng Wang ◽  
Bohong Chen
Keyword(s):  
Steam Reforming ◽  
Heat Recovery ◽  
Waste Heat ◽  
Effective Means ◽  
Inlet Temperature ◽  
Methanol Steam Reforming ◽  
Inlet Velocity ◽  
Automobile Exhaust ◽  
Exhaust Heat ◽  
Production Of Hydrogen

Automobile exhaust heat recovery is considered to be an effective means to enhance fuel utilization. The catalytic production of hydrogen by methanol steam reforming is an attractive option for onboard mobile applications, due to its many advantages. However, the reformers of conventional packed bed type suffer from axial temperature gradients and cold spots resulting from severe limitations of mass and heat transfer. These disadvantages limit reformers to a low efficiency of catalyst utilization. A novel rib microreactor was designed for the hydrogen production from methanol steam reforming heated by automobile exhaust, and the effect of inlet exhaust and methanol steam on reactor performance was numerically analyzed in detail, with computational fluid dynamics. The results showed that the best operating parameters were the counter flow, water-to-alcohol (W/A) of 1.3, exhaust inlet velocity of 1.1 m/s, and exhaust inlet temperature of 773 K, when the inlet velocity and inlet temperature of the reactant were 0.1 m/s and 493 K, respectively. At this condition, a methanol conversion of 99.4% and thermal efficiency of 28% were achieved, together with a hydrogen content of 69.6%.

A Proposal of Waste Heat Recovery System Through Methanol Steam Reforming Integrated With Absorption Heat Pump

2011 ◽  
Author(s):  
Shunsuke Kawasaki ◽  
Willy Yanto Wijaya ◽  
Hirotatsu Watanabe ◽  
Ken Okazaki
Keyword(s):  
Heat Pump ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Waste Heat ◽  
Methanol Steam Reforming ◽  
Pass System ◽  
Heat Temperature ◽  
Absorption Heat Pump ◽  
Waste Heat Recovery System ◽  
Recovery System

Through the methanol steam reforming (MSR), the energy of low temperature waste heat (100–150°C) can be recovered into that of hydrogen. However, actual MSR requires over 200°C to enable the high conversion of methanol into hydrogen. In this research, two types of combined absorption heat pump (AHP) and MSR systems were proposed: one-pass system and steam recycling system. The role of the AHP is to enhance the temperature level of the waste steam up to 230°C, which is used for the MSR. To evaluate the performances of these systems, “energy enhancement factor” was defined. As a result, the recovered energy of the waste heat was almost three times as much as the required work for the AHP when the reaction temperature and waste heat temperature and S/C ratio were 210°C and 150°C and 4.0, respectively. It was also indicated that the steam recycling was more effective at the higher reaction temperature and lower waste heat temperature and higher S/C ratio.

Optimization of Catalyst Loading for Porous Copper Fiber Sintered Felts Used in Methanol Steam Reforming Microreactors

2013 ◽  
Vol 36 (2) ◽  
pp. 307-314 ◽  
Author(s):  
W. Zhou ◽  
Y. Tang ◽  
Q. Wang ◽  
K. S. Hui ◽  
K. N. Hui ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Catalyst Loading ◽  
Methanol Steam Reforming ◽  
Porous Copper
Sign in / Sign up

Export Citation Format

Share Document