Pore-scale study on heat and mass transfer of electrothermal swing adsorption process into X-ray tomography reconstructed activated carbon fibre felt

Ma, Qiang; Zhao, Lijuan; Chen, Zhenqian; Su, Huaneng; Xu, Qian

doi:10.1016/j.ces.2021.116494

Cited by 5 publications

(5 citation statements)

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“…The flow velocity of carrier gas plays a key role in the performance of the adsorption/desorption process. In our previous work, [ 28 ] the effects of carrier gas velocity denoted by Reynolds number ( Re ) on the electrothermal swing adsorption was investigated using LBM simulation. This work reveals the convective heat and mass transfer behaviours of the combined regeneration process with the varying carrier gas velocities.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, at the interface between the ACF and fluid in the macropores, the continuity of temperature and normal heat flux are satisfied as follows:

T_{f, interface +} goodbreak= T_{s, interface -},

((), k_{f} \nabla T_{f, interface +} goodbreak+ ρ_{f} c_{Pf} bold-italicu T_{f, interface +}) \cdot \overset{n}{true} goodbreak= ((), k_{s, italiceff} \nabla T_{s, interface -}) \cdot \overset{n}{true} .

The relationship between the equalized adsorption amount and the concentration of toluene at the interface is obtained using the Langmuir theory [ 30 ] :

\frac{N_{w, e}}{N_{m}} goodbreak= \frac{K C_{w}}{1 + K C_{w}},

where N w,e and N m denote the equalized adsorption amount at the surface and the saturation adsorption amount of toluene, respectively, and K denotes the Langmuir model parameter. Using the principle of mass conservation, the mass flux at the ACF surface induced by adsorption/desorption effects is determined by the following [ 28 ] :

\frac{\partial N_{w}}{\partial t} d \overset{n}{true} goodbreak= D_{m, t} \frac{\partial C_{w}}{\partial \overset{n}{true}} .

This mathematical model mainly focuses on the reactive and adsorptive transport behaviours during the combined regeneration process of ACF felt. Some complex additional interaction mechanisms occurring in the actual industry process (e.g., the adsorbate thermal decomposition, chemical adsorption, and oligomerization [ 31 ] ) are not considered in this numerical model.…”

Section: Methodsmentioning

confidence: 99%

“…The above equations can be solved using a pore‐scale 3D multiple‐relaxation‐time LBM, and the computing method and the validation cases were elaborated in detail in our previous work. [ 28 ]…”

Section: Methodsmentioning

confidence: 99%

“…where N w,e and N m denote the equalized adsorption amount at the surface and the saturation adsorption amount of toluene, respectively, and K denotes the Langmuir model parameter. Using the principle of mass conservation, the mass flux at the ACF surface induced by adsorption/desorption effects is determined by the following [28] :…”

Section: Numerical Modelmentioning

confidence: 99%

“…In our previous work, [ 28 ] we proposed a three‐dimensional (3D) LBM to solve convective heat and mass behaviours of electrothermal swing adsorption of VOCs in the pore structure of ACF felt reconstructed by X‐ray microtomography technology. Nevertheless, the in‐situ degradation process of VOCs has not yet been considered in the existing work.…”

Section: Introductionmentioning

confidence: 99%

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A pore‐scale investigation for recovering adsorptive capacity of activated carbon fibre felt using electrothermal desorption combined with ozonization in‐situ degradation method

Weng

et al. 2022

Can J Chem Eng

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Porous activated carbon fibre (ACF) materials, as a recycled absorbent, have been widely applied in the harmless disposal of volatile organic chemicals (VOCs). In order to reduce the energy consumption of cyclic regeneration process and avoid second pollution of high concentration VOCs, there is an urgent need to develop a synergistic regeneration method to recover the adsorptive capacity of ACF and achieve the in‐situ degradation of VOCs simultaneously. Due to the outstanding oxidation performance of ozone, ozonization was used to degrade VOCs adsorbed by absorbent materials and has a potential advantage in combination with the traditional electrothermal desorption technology. In this work, a three‐dimensional pore‐scale lattice Boltzmann method (LBM) is established to solve the convective heat and mass transfer processes considering the desorption and ozonization effects. Using this numerical model, a pore‐scale simulation is performed to investigate the reactive and desorptive transport behaviours in the reconstructed pore structure of ACF felt, which is regenerated using the electrothermal desorption process combined with the ozonization degradation method. The simulation works reveal the effects of key operation parameters on the desorption and degradation mechanisms into the pores of ACF felt during this combined regeneration process. The numerical results show that the flow velocity of carrier gas plays an important role on the performance of the combined regeneration process. The approach of reducing the carrier gas velocity would obviously improve the degradation ratio of VOC and the efficiency of the combined regeneration process.

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Section: Discussionmentioning

confidence: 99%

“…Moreover, at the interface between the ACF and fluid in the macropores, the continuity of temperature and normal heat flux are satisfied as follows:

T_{f, interface +} goodbreak= T_{s, interface -},

((), k_{f} \nabla T_{f, interface +} goodbreak+ ρ_{f} c_{Pf} bold-italicu T_{f, interface +}) \cdot \overset{n}{true} goodbreak= ((), k_{s, italiceff} \nabla T_{s, interface -}) \cdot \overset{n}{true} .

The relationship between the equalized adsorption amount and the concentration of toluene at the interface is obtained using the Langmuir theory [ 30 ] :