High Temperature Energy Storage Performances of Methane Reforming with Carbon Dioxide in Tubular Packed Reactor

Lu, Jianfeng; Chen, Yuan; Ding, Jing; Wang, Weilong

doi:10.1016/j.egypro.2014.11.1136

Cited by 8 publications

(12 citation statements)

References 8 publications

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“…Validation runs were carried out for MSR and MDR to validate the set of equations presented in Section 2. Results obtained from the computational model (i.e., continuity, momentum, energy, species, and reaction kinetics) of steam and dry methane reforming were validated against the experiential data obtained from Hoang 31 and Lu, 24 respectively. In the work of Hoang, 31 the reformer bed is of 10 mm inner diameter and 150 mm long and it is packed with nickel catalyst supported on gamma alumina.…”

Section: Model Validationmentioning

confidence: 99%

“…For simplicity, this study was carried out for exhaust gas reforming of methane (main constituent of natural gas) in a tubular packed bed reactor. This kind of reactor has been widely studied for both steam 21,22 and dry 23,24 methane reforming. The packed bed reactor adopted in this study is shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…25 The adopted reactor is similar to the one reported in reference. 24 A computational fluid dynamics approach was used to model the reactor under steady state conditions. The reactor is modeled as a pseudohomogeneous catalytic bed such that the feed gases and the catalyst are modeled as one continuum.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling and Simulation of Oxy-Combustion Exhaust Gas Recycling for Fuel Reforming

Sanusi

Mokheimer

2017

Energy Fuels

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Different pragmatic approaches have recently been adopted in Paris Agreement of 2015 on the reduction of greenhouse gases, especially carbon dioxide (CO2). A viable option toward reduction of CO2 emission is to couple an exhaust gas fuel reforming reactor to an oxy-combustion power plant for in situ recycling and utilization of unwanted CO2 emission for fuel upgrade. In such a system, steam and dry fuel reforming take place simultaneously with the exhaust gases that are mainly water vapor and carbon dioxide. This study was carried out to explore the advantage of using the gas turbine high exhaust temperature and utilize the unwanted CO2 for fuel upgrade via methane-exhaust gas reforming. A numerical model was developed to study the effect of reforming temperature, gas hourly space velocity (GHSV) and reformer gas ratio (CO2/H2O) on the following performance metrics: methane conversion, fuel upgrade, and hydrogen yield in an exhaust gas-reforming reactor. Results show that the methane conversion increases with decreasing GHSV (i.e., increasing residence time) and approaches its thermodynamic equilibrium at GHSV= 1000 h–1. Different scenarios were investigated under different reformer gas ratio (CO2/H2O). At low temperature, steam methane reforming is the dominant route for methane conversion. While at high reforming temperature, methane becomes the limiting reactant that is consumed via both steam and dry reforming. Wet exhaust gas reforming with reformer gas ratio (CO2/H2O) of 2.85 has fuel upgrade of about 25% as compared to about 19% obtained in dry exhaust gas reforming. It was further shown that the reformer gas ratio (CO2/H2O) can be manipulated to give the desired syngas ratio (H2/CO) depending on the application. For reformer gas ratio of 2.85, the syngas ratio obtained is 1.66 at 1073 K, which is suitable for use in Fischer–Tropsch and MeOH/DME synthesis.

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Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling and Simulation of Oxy-Combustion Exhaust Gas Recycling for Fuel Reforming

Sanusi

Mokheimer

2017

Energy Fuels

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“…As a result, the endothermic ammonia decomposition reaction temperature is adjusted to be high ~550 • C for a considerable conversion. Nevertheless, the high reaction temperature does not only increase the exergy loss through the heat recuperation but also cause a large re-radiation loss [22,31,35]. Consequently, decreasing the ammonia decomposition temperature at a relatively high pressure is very critical to improve the efficiency.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Enhancement of an Ammonia-Based Solar Thermochemical Energy Storage System Implemented with Hydrogen Permeation Membrane

et al. 2021

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The ammonia-based solar thermochemical energy storage (TCES) is one of the most promising solar TCESs. However, the solar-to-electric efficiency is still not high enough for further commercialization. The efficiency is limited by the high ammonia decomposition reaction temperature, which does not only increase the exergy loss through the heat recuperation but also causes a large re-radiation loss. Nonetheless, lowering the reaction temperature would impact the conversion and the energy storage capacity. Thanks to the recent development of the membrane technology, the hydrogen permeation membrane has the potential to enhance the conversion of ammonia decomposition under the moderate operating temperature. In this paper, an ammonia-based solar thermochemical energy storage system implemented with hydrogen permeation membrane is proposed for the first time. The system model has been developed using the Aspen Plus software implemented with user-defined Fortran subroutines. The model is validated by comparing model-generated reactor temperatures and conversions profiles with data from references. With the validated model, an exergy analysis is performed to investigate the main exergy losses of the system. Furthermore, the effects of the membrane on system efficiency improvement are studied. The results show that exergy loss in the charging loop is dominant, among which the exergy losses of Heat Exchanger Eh,A, together with that of the re-radiation Er, play important roles. Compared with the conventional system, i.e., the system without the membrane, the Eh,A and Er of the proposed system are more than 30% lower because the hydrogen permeation membrane can improve ammonia conversion at a lower endothermic reaction outlet temperature. Consequently, the proposed system, presumably realized by the parabolic trough collector at ~400 °C, has a theoretical solar-to-electric efficiency of ηste, which is 4.4% higher than the conventional ammonia-based solar thermochemical energy storage system. Last but not least, the efficiency is 3.7% higher than that of a typical parabolic trough solar power plant, which verifies the thermodynamic feasibility of further commercialization.

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“…The performance characteristics of the MRCR for H 2 production was studied using computational fluid dynamic (CFD) modeling in the present work. The use of CFD techniques in modeling packed bed reformer, with hydrogen membrane, for both laboratory and industrial application has been widely reported. CFD studies have also been used to understand combustion dynamics in industrial furnaces .…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Sanusi

Mokheimer

2018

Int J Energy Res

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Summary Hydrogen is mostly produced in conventional steam methane reforming plants. In this work, we proposed a membrane‐based reformer‐combustor reactor (MRCR) for hydrogen generation in order to improve heat recovery and overall thermal efficiency. The proposed configuration will also reduce the complexity in existing steam methane reforming (SMR) plants. The proposed MRCR comprises combustion zone, hydrogen permeate zone, and SMR zone. A computational fluid dynamics model was developed using ANSYS‐Fluent software to simulate and analyze the performance of the proposed MRCR. Results show that high hydrogen yields were observed at high reformer pressures (RPs) and low gas hourly space velocities (GHSVs). Furthermore, by increasing the steam to methane ratio and addition of excess air in the combustion side, the hydrogen yield from the MRCR decreases. This is attributed to the reduction in the effective temperature of the hydrogen membrane. High RP, low GHSV, and low steam to methane ratio that increased the hydrogen yield also decreased carbon monoxide (CO) emissions. For an increased RP from 1 to 10 bar, the CO emission decreased by about 99%. The reduction in CO emission at high RP would be attributed to the effect of water gas shift reaction in the MRCR. Results of the extensive parametric study presented in this work can be used to determine the operating conditions based on tradeoffs between hydrogen yield (mole H2/mole CH4), hydrogen production rate (kg of H2/h), allowable CO emissions, and exhaust gas temperature for other applications such as gas turbine.

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High Temperature Energy Storage Performances of Methane Reforming with Carbon Dioxide in Tubular Packed Reactor

Cited by 8 publications

References 8 publications

Numerical Modeling and Simulation of Oxy-Combustion Exhaust Gas Recycling for Fuel Reforming

Numerical Modeling and Simulation of Oxy-Combustion Exhaust Gas Recycling for Fuel Reforming

Efficiency Enhancement of an Ammonia-Based Solar Thermochemical Energy Storage System Implemented with Hydrogen Permeation Membrane

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

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