Hydrogen production, oxygen separation and syngas oxy-combustion inside a water splitting membrane reactor

Nemitallah, Medhat A.; Habib, Mohamed A.; Salaudeen, Shakirudeen A.; Mansir, Ibrahim B.

doi:10.1016/j.renene.2017.05.086

Cited by 17 publications

(7 citation statements)

References 50 publications

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“…, at sweep side (7) where J O 2 and J H 2 are the oxygen permeation rate (mol/m 2 •s) and hydrogen production rate (mol/m 2 •s), respectively; A cell and V cell are the area (m 2 ) and volume (m 3 ) of the cells, respectively, and MW O 2 and MW O 2 are the molecular weight of oxygen and hydrogen (kg/mol), respectively. The oxygen permeation model for the LSCuF−7328 membrane that combines surface exchange on the feed and sweep sides, and the bulk diffusion in terms of the oxygen partial pressures, is given as follows [23]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…The density and the thermal conductivity of the membrane are taken as 6000 kg/m 3 and 4 W/(m•K), respectively [7]. The emissivity of the membrane and the quartz tube walls are set to 0.8 [7]. These parameters are summarized in Table 1.…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

“…The OTMs are made of mixed ionic and electronic conducting materials that can simultaneously conduct electrons and oxygen ions. Thus, the membrane has a 100% selectivity to oxygen while it is impermeable to other gases; only oxygen can permeate through the membrane [7]. In a water splitting membrane reactor, one side of the membrane (defined as the feed side) is exposed to the water vapor, where water splits into oxygen and hydrogen at an elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

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CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor

Zhao

Chen

2021

Energies

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Hydrogen production from water splitting remains difficult due to the low equilibrium constant (e.g., Kp ≈ 2 × 10−8 at 900 °C). The coupling of methane combustion with water splitting in an oxygen transport membrane reactor can shift the water splitting equilibrium toward dissociation by instantaneously removing O2 from the product, enabling the continuous process of water splitting and continuous generation of hydrogen, and the heat required for water splitting can be largely compensated for by methane combustion. In this work, a CFD simulation model for the coupled membrane reactor was developed and validated. The effects of the sweep gas flow rate, methane content and inlet temperature on the reactor performance were investigated. It was found that coupling of methane combustion with water splitting could significantly improve the hydrogen generation capacity of the membrane reactor. Under certain conditions, the average hydrogen yield with methane combustion could increase threefold compared to methods that used no coupling of combustion. The methane conversion decreases while the hydrogen yield increases with the increase in sweep gas flow rate or methane content. Excessive methane is required to ensure the hydrogen yield of the reactor. Increasing the inlet temperature can increase the membrane temperature, methane conversion, oxygen permeation rate and hydrogen yield.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor

Zhao

Chen

2021

Energies

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“…The thermal conductivity of the membrane is 4 W/(m•K). The emissivity of the membrane and the quartz tube are set to be 0.8 [21]. The thermal conductivity of the baffle is 0.1 W/(m•K), and the emissivity of the baffle is assumed to be 0.95.…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

CFD Simulation of Syngas Combustion in a Two-Pass Oxygen Transport Membrane Reactor for Fire Tube Boiler Application

Zhao

Chen

2021

Energies

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The oxygen transport membrane reactor technology enables the stable combustion of syngas and reduction in NOx emission. Applying the syngas combustion membrane reactor to fire tube boiler can integrate oxygen separation, syngas combustion, and steam generation in a single apparatus. In this study, a CFD model for oxygen permeation and syngas combustion in a two-pass LSCoF-6428 tubular membrane reactor for fire tube boiler application was developed to study the effects of the inlet temperature, the sweep gas flow rate, and the syngas composition on the reactor performance. It is shown that the inlet temperature has a strong effect on the reactor performance. Increasing the inlet temperature can efficiently and significantly improve the oxygen permeability and the heat production capacity. A 34-times increase of oxygen permeation rate and a doubled thermal power output can be obtained when increasing the inlet temperature from 1073 to 1273 K. The membrane temperature, the oxygen permeation rate, and the thermal power output of the reactor all increase with the increase of sweep gas flow rate or H2/CO mass ratio in syngas. The feasibility of the syngas combustion membrane reactor for fire tube boiler application was elucidated.

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“…O aumento da fração H2 no combustível syngas aumenta a permeação de oxigênio bem como a temperatura de combustão, melhorando significativamente a combustão (NEMITALLAH et al, 2017).…”

Section: Combustão E Meio Ambienteunclassified

Influência Da Relação De Pressão E Fração De Ar Extraída Do Compressor No Arrefecimento Das Pás De Turbinas a Gás

Venâncio¹,

Marconi²,

Monhol³

2019

SODEBRAS

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projeto de extensão com decorrências no contexto contemporâneo de consumo. Para isso, foi realizada uma análise por meio das confluências entre a literatura e o arsenal documental do projeto para sua caracterização extensionistas. Observou-se, a partir da pesquisa, que o Clube de Trocas tem possibilitado a ressignificação do consumo e a mitigação de suas consequências, pautando assim a construção de uma nova epistemologia benéfica e solidária. Além disso, o mesmo tem se apresentado como um espaço potencial para a formação coletiva que propicia a experimentação e a vivência de outra dinâmica de consumo, direta, critica e socializadora.

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Hydrogen production, oxygen separation and syngas oxy-combustion inside a water splitting membrane reactor

Cited by 17 publications

References 50 publications

CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor

CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor

CFD Simulation of Syngas Combustion in a Two-Pass Oxygen Transport Membrane Reactor for Fire Tube Boiler Application

Influência Da Relação De Pressão E Fração De Ar Extraída Do Compressor No Arrefecimento Das Pás De Turbinas a Gás

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