Experimental evaluation of a heat pipe cooled structured reactor as part of a two-stage catalytic methanation process in power-to-gas applications

Neubert, Michael; Hauser, Alexander; Pourhossein, Babak; Dillig, M.; Karl, Jürgen

doi:10.1016/j.apenergy.2018.08.002

Cited by 32 publications

(27 citation statements)

References 41 publications

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“…Gruber et al proposed two‐stage structured reactors with integrated cooling and increasing thickness of the catalyst layer from 160 to 750 µm to achieve high conversions exceeding 90 % . Other cooling concepts for structured reactors include the incorporation of heat pipes into the reactor .…”

Section: Introductionmentioning

confidence: 99%

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design

et al. 2019

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The sulfur tolerance of mono‐ and bimetallic ruthenium catalysts for CO2 hydrogenation was investigated in microchannel reactors. H2S was selected as a model compound. It was found that a Ru/CeO2 catalyst deactivates rapidly. Ni was a much better additive to improve the catalyst stability compared to Rh and serves as a sulfur trap. The influence of the support was evaluated showing that a SiO2‐supported catalyst has a higher stability and better selectivity compared to CeO2 and TiO2. A plant concept was developed comprising two‐step methanation with a first adiabatic reactor stage followed by a plate heat‐exchanger reactor with integrated cooling which allows more than 97 % CO2 conversion. A pilot plant will be put into operation in connection with a biogas plant and an electrolyser of 50 kW power consumption.

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Section: Introductionmentioning

confidence: 99%

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design

et al. 2019

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“…There are techniques that measure subsurface temperatures, such as the use of thermowells. [2][3][4] However, they need to be installed invasively with clear implications on cost and structural integrity. 5,6 This article presents a method for estimating the temperature of an inaccessible surface using a time-of-flight (ToF) measurement from an opposing accessible surface.…”

Section: Motivationmentioning

confidence: 99%

“…where temperature T (x, t) is a function of both time and space; a is the thermal diffusivity of the material; k, c p and r denote the heat conductivity, specific heat capacity and density of the material, respectively. The heat diffusion equation can be solved either analytically or numerically; here, an explicit 1D finite difference scheme (see illustration in Figure 4) is applied to transform equation (4) into the discretised form (equation 6). Equation 7subsequently allows the temperature of a node at the current status (T n i ) to be determined based on the past status of the adjacent nodes (T nÀ1 iÀ1 , T nÀ1…”

Section: Ultrasonic Temperature Measurementmentioning

confidence: 99%

Ultrasonic monitoring of pipe wall interior surface temperature

Zhang

Cegla

Corcoran

2020

Structural Health Monitoring

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Accurate temperature measurement is a crucial aspect of structural health monitoring and prognosis. Conventional temperature measurement devices are either incapable of measuring subsurface temperatures in solids or need to be invasively installed. This study investigates the use of an ultrasonic technique for non-invasive measurement of subsurface temperatures in steel components; the temperature of a point on an inaccessible surface is inferred using a time-of-flight measurement from a transducer placed on an opposing accessible surface. Two different inversion approaches are presented, one named the assumed distribution method and the other named the inverse thermal modelling method. The robustness and accuracy of the two ultrasonic temperature inversion methods are quantitatively assessed via simulations and controlled experiments. It was found that both the assumed distribution and inverse thermal modelling methods demonstrate short thermal response times and are able to track the temperature evolution of inaccessible surfaces. A series of experimental studies show that in the presence of a 15°C difference between the accessible and inaccessible surfaces, the inaccessible surface temperature is typically measured to within better than 2°C with respect to a resistance temperature detector reference measurement. Additionally, the article compares the measurement performance achieved using a deployable electromagnetic acoustic transducer and a permanently installed piezo-electric PZT transducer. The time-of-flight measurements taken using the electromagnetic acoustic transducer system had higher random noise than the PZT system (standard deviations of 0.42 and 0.016 ns, respectively), subsequently leading to higher random noise in the temperature estimates.

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“…Koytsoumpa used thermodynamic and kinetic modeling approaches for their findings, which is certainly sufficient to prove the main concept advantage of decreased compression power. Neubert et al [ 14 ] correctly concluded, that intermediate compression is particularly useful if the hydrogen is generated at moderate pressures. The proposed PtG concept of combined Co‐SOEC and methanation with intermediate compression represents an alternative to upstream syngas compression.…”

Section: Introductionmentioning

confidence: 99%

Dual Pressure Level Methanation of Co‐SOEC Syngas

et al. 2020

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The objective of this article is to demonstrate significant efficiency and performance improvements by simple process modifications of a power to gas plant consisting of high‐temperature coelectrolysis and catalytic methanation. For the advanced process design dual step methanation with two different pressure levels including intermediate compression is proposed, leading to several advantages. By experimental investigations on a lab‐scale methanation test plant higher turnovers (increase of up to 7.1 percentage points) and lower temperature peaks (decrease by up to 130 K) can be proven. Basic energy balance calculations reveal furthermore a reduction in compressor power by 42% for this proposed system.

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Experimental evaluation of a heat pipe cooled structured reactor as part of a two-stage catalytic methanation process in power-to-gas applications

Cited by 32 publications

References 41 publications

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design

Ultrasonic monitoring of pipe wall interior surface temperature

Dual Pressure Level Methanation of Co‐SOEC Syngas

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Experimental evaluation of a heat pipe cooled structured reactor as part of a two-stage catalytic methanation process in power-to-gas applications

Cited by 32 publications

References 41 publications

CO2 Methanation in Microstructured Reactors – Catalyst Development and Process Design

CO2 Methanation in Microstructured Reactors – Catalyst Development and Process Design

Ultrasonic monitoring of pipe wall interior surface temperature

Dual Pressure Level Methanation of Co‐SOEC Syngas

Contact Info

Product

Resources

About

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design

CO₂ Methanation in Microstructured Reactors – Catalyst Development and Process Design