Advanced+Reaction+Engineering+Seminar

Figure 7 Axial temperature distribution on three kinds of catalyst distributions
Results and discussion
MSR on gradient distributed catalyst bed
inlet temperature of 543 K
Experiment of catalyst activity distribution effect on methanol steam reforming performance in the packed bed plate-type reactor
Team 8:
Li Zunhua Tang Zengmin Luo Yongguang Xia Ming Sun Xiaotong
Still has cold spots
Cold spot could be removed only when Impractical the equivalent diameter was as small as 300 mm
Introduction
5. Strategy in this study Designed optimal distributions of catalyst bed Carried out MSR in catalyst beds with a plate-type reactor Optimized catalyst activity & heat load l Higher methanol conversion & hydrogen production rate have been achieved
Introduction
3. Packed bed reactor
Packed beds are widely used to produce hydrogen in industry. Packed bed is a hollow tube, pipe, or other vessel that is filled with a packing material. To improve contact area between two phases. Advantages: High efficiency; easy operation; simple structure; Suitable for all kinds of shapes immobilized enzyme et al. Limitation: Slow heat and mass transfer makes occurrence of cold spots. The effectiveness factor of conventional steam reformers is less than 5%
(1) Low Emission.
Clean Energy sources Mitigating
(2) High Energy
Energy Heat Value (108J/kg) H2 1.43 Petroleum 0.38-0.46 Naturaln Gas 0.33 Liquid Petroleum Gas 1.05
c
d
Catalyst distribution
Micro-reactor
Soap film flow meter Measure the gas product volume
Gas chromatograph
Analyzing gas product
Condense and ice trap Remove unreacted CH3OH and water
A higher space velocity could lead to a smaller residence time, thus resulting in a lower catalyst utilization.
Figure 4 Methanol conversion as a function of space velocity on uniform distributed catalyst
Advantages:
(1) High H/C ratio: 4:1. Idealized conversion of all carbon to CO2 and all hydrogen to H2.
(2) Reformed at a relatively low temperature (240–260 ℃). Methane reforming:800–1000 ℃. (3) Small amount of CO impurity. Good to supply PEMFCs (Proton exchange membrane fuel cells). (4) Does not contain S(sulfur), which is poisonous to the fuel cell.
Figure 10 Variation of methanol conversion with temperature
Results and discussion
MSR on gradient distributed catalyst bed
Figure 11 Variation of hydrogen production rate with temperature
Emission of
CO2,SO2…….
Introduction
2. Hydrogen Production Mechanism: Methanol Steam Reforming (MSR)
(1) MSR reaction (2) Water gas shift reaction (3) Methanol decomposition reaction
Figure 8 Comparison of methanol conversion on different catalyst activity distributions
Results and discussion 161.3
MSR on gradient distributed catalyst bed
Experiment
Gradient catalyst
0.3/0.7 0.5/0.5 0.7/0.3 0.9/0.1 1.1/0 Distribution A: Increasing
3.5/1.6
Uniform Distribution: Uniform CuO/ZnO/Al2O3/quartz
1.1/0 0.9/0.1 0.7/0.3 0.5/0.5 0.3/0.7 Distribution B : Reduction
Figure 3 images of the reactor and catalyst distribution
Contents
Introduction
Experiment
Results and discussion
Conclusion
Results and discussion
MSR on uniform distributed catalyst bed
2015-12-17
ቤተ መጻሕፍቲ ባይዱ
Contents
Introduction
Experiment
Results and discussion
Conclusion
Contents
Introduction
Experiment
Results and discussion
Conclusion
Introduction
1. Motivation Conventional Energy &
Results and discussion
MSR on gradient distributed catalyst bed
inlet temperature of 543 K space velocity of 1.42 h-1
cold spot temperature difference 3K 6K 10 K
Figure 9 Comparison of hydrogen production rate on different catalyst activity distribution
Results and discussion
MSR on gradient distributed catalyst bed
Contents
Introduction
Experiment
Results and discussion
Conclusion
Experiment
Injection pump CH3OH/H2O flow Evaporator Super heater reaction gas phase flow
Figure 5 Temperature profile along the reactor on uniform distributed catalyst
Results and discussion
MSR on uniform distributed catalyst bed
Figure 6 Temperature profile along the reactor under variable inlet condition on uniform distributed catalyst
Figure 1 reaction system process
Experiment
Measure temperature