Thermal stress numerical study in granular packed bed storage tank

Sassine, Nahia; Donzé, Frédéric; Harthong, Barthélémy; Bruch, Arnaud

doi:10.1007/s10035-018-0817-y

Cited by 21 publications

(14 citation statements)

References 41 publications

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“…3(a) and (c). This behavior was also observed by Sassine et al [19]. The first regime is due to compaction of the granular material, since pressure increases as the total packing density increases.…”

Section: Resultssupporting

confidence: 81%

“…They studied the changes of the bed height and the force exerted on the vertical walls after one cycle. Sassine et al [19] considered a 3D system with spherical particles and examined the pressure exerted on a rigid cylindrical container and the particle displacements. They investigated both homogeneous and moving linear temperature fields.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of confined granular beds under cyclic thermal loading

et al. 2019

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We investigate the mechanical behavior of a confined granular packing of irregular polyhedral particles under repeated heating and cooling cycles by means of numerical simulations with the Non-Smooth Contact Dynamics method. Assuming a homogeneous temperature distribution as well as constant temperature rate, we study the effect of the container shape, and coefficients of thermal expansions on the pressure buildup at the confining walls and the density evolution. We observe that small changes in the opening angle of the confinement can lead to a drastic peak pressure reduction. Furthermore, the displacement fields over several thermal cycles are obtained and we discover the formation of convection cells inside the granular material having the shape of a torus. The root mean square of the vorticity is then calculated from the displacement fields and a quadratic dependency on the ratio of thermal expansion coefficients is established.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Behavior of confined granular beds under cyclic thermal loading

et al. 2019

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“…The settlement of the beds was measured only at the end of the test campaign and was not continuously surveyed during the tests. However, this phenomenon is likely to be progressive (Sassine et al, 2018). That's why, even if the settlement reduces the height of the beds and probably displaced some thermocouples, especially in the granular bed, the original heights and thermocouple positions were used to analyse the experimental results and to simulate the systems.…”

Section: Mechanical Observationsmentioning

confidence: 99%

Experimental study and numerical modelling of high temperature gas/solid packed-bed heat storage systems

Esence

Desrues

Fourmigué

et al. 2019

Energy

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Two pilot-scale regenerative heat storage systems have been tested by the French Alternative Energies and Atomic Energy Commission (CEA). The first one is a 1.1-MWhth structured packed bed consisting of ceramic plates forming corrugated channels. The second one is a 1.4-MWhth granular packed bed consisting of basaltic rocks enclosed by refractory walls. The two regenerators were tested over a hundred of thermal cycles between 80°C and 800°C with different fluid mass flows. Both systems showed their ability to store heat efficiently and to provide thermal energy at a stable temperature for the most part of the discharge process. The granular packed bed exhibited large transverse thermal heterogeneities due to flow channelling in the corners of the cross section. However, this phenomenon appears not to have degraded significantly the thermal performances, and the average one-dimensional thermal behaviour of the system may be assessed thanks to the surface weighted average of the temperature over the bed cross section. Compared to the granular packed bed, the structured bed showed comparable thermal performances while inhibiting flow heterogeneities and reducing by up to 54% the average pressure drop. Furthermore, at the end of the test campaign, the packed beds were observed and compared from a mechanical point of view. The thermal results were successfully simulated over numerous charge/discharge cycles thanks to a onedimensional numerical model. This is significant since the discrepancies between experimental and numerical results are likely to accumulate from a cycle to the other. The model considers the packed beds as continuous and homogeneous porous media but takes account of the conduction resistances within the solid filler and the walls. The pressure drop of the beds was computed using a correlation developed thanks to a previous CFD study for the structured packed bed, and the Ergun equation for the granular packed bed. Compared to experimental data, these correlations enabled to estimate the order of magnitude and the evolution trend of the pressure drop with an average deviation ranging from-7.2% to +61.9%. For the granular packed bed, these deviations are ascribed to the flow heterogeneities and the shape of the rocks which are not taken into account in the Ergun equation.

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“…The expansion of the heat-storing medium (bulk material) during the heating process leads to a stress increase on the walls of the heat storage tank. Previous results [1], [6], [7], [8] have shown that increasing contact forces of the bulk material and the associated stress increase on the heat storage walls can lead to damage (see Figure 1). The special feature of this project is to consider this thermal expansion of the bulk material and to investigate the thermal ratcheting phenomenon (increasing stress due to several loading and unloading cycles).…”

Section: Introductionmentioning

confidence: 87%

Analysis of the thermal ratcheting phenomenon in packed-bed thermal energy storage using Discrete Element Method

Mitterlehner¹,

Kartnig²,

Haider³

2020

FME Transactions

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Packed-bed thermal energy storages (TES) play a major role in energy technology. During energy absorption, hot air flows through the content of the TES in top-down direction. During the heating process, the expansion of the heat-storing medium (bulk material) leads to a stress increase on the walls of heat-storage tanks. These occurring loads are to be considered by means of a discretized model. Furthermore, it is of interest how the loads modify during several loading and unloading processes (thermal ratcheting phenomenon). In this paper, it will be investigated how this behaviour can be modelled using the DEM approach.

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Thermal stress numerical study in granular packed bed storage tank

Cited by 21 publications

References 41 publications

Behavior of confined granular beds under cyclic thermal loading

Behavior of confined granular beds under cyclic thermal loading

Experimental study and numerical modelling of high temperature gas/solid packed-bed heat storage systems

Analysis of the thermal ratcheting phenomenon in packed-bed thermal energy storage using Discrete Element Method

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