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Title: Residence time distribution in a structured packing unit for monitoring aerosol emissions

Abstract

Solvent absorption in a structured packed column has been demonstrated as a viable option for post-combustion carbon capture. Amine emissions in the form of aerosol particles pose a major challenge that severely impacts the separation efficiency of the packed column. The aerosol particles quickly achieve the motion of the gas flow. In this context, residence time distribution (RTD) of the gaseous phase will provide insights for managing aerosol particles, thereby controlling amine loss in the packed column. Computational fluid dynamics (CFD) modeling of such columns is a multiscale problem because of a wide range of disparity in length scales. Accordingly, three-dimensional CFD simulations in the representative elementary unit of a structured packing are conducted using OpenFOAM. The RTD is analyzed in terms of residence time distribution function, mean residence time, and variance. Effects of the diffusivity and flow rates on RTD are extensively studied, and the dispersion coefficient is calculated using a one-dimensional axial dispersion model. Furthermore, RTDs computed in a smaller domain are extrapolated to a larger domain using a convolution integral. The computed and corresponding CFD models derived from the convolution integral match well at different flow rates and domain sizes. A comparison of RTD among different packingmore » designs also is presented at a fixed number of repeating units and different flow rates.« less

Authors:
; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1488459
Report Number(s):
PNNL-SA-135050
Journal ID: ISSN 1750-5836
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 79; Journal Issue: C; Journal ID: ISSN 1750-5836
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
structured packings, residence time distribution

Citation Formats

Singh, Rajesh K., Wang, Chao, and Xu, Zhijie. Residence time distribution in a structured packing unit for monitoring aerosol emissions. United States: N. p., 2018. Web. doi:10.1016/j.ijggc.2018.11.001.
Singh, Rajesh K., Wang, Chao, & Xu, Zhijie. Residence time distribution in a structured packing unit for monitoring aerosol emissions. United States. doi:10.1016/j.ijggc.2018.11.001.
Singh, Rajesh K., Wang, Chao, and Xu, Zhijie. Sat . "Residence time distribution in a structured packing unit for monitoring aerosol emissions". United States. doi:10.1016/j.ijggc.2018.11.001.
@article{osti_1488459,
title = {Residence time distribution in a structured packing unit for monitoring aerosol emissions},
author = {Singh, Rajesh K. and Wang, Chao and Xu, Zhijie},
abstractNote = {Solvent absorption in a structured packed column has been demonstrated as a viable option for post-combustion carbon capture. Amine emissions in the form of aerosol particles pose a major challenge that severely impacts the separation efficiency of the packed column. The aerosol particles quickly achieve the motion of the gas flow. In this context, residence time distribution (RTD) of the gaseous phase will provide insights for managing aerosol particles, thereby controlling amine loss in the packed column. Computational fluid dynamics (CFD) modeling of such columns is a multiscale problem because of a wide range of disparity in length scales. Accordingly, three-dimensional CFD simulations in the representative elementary unit of a structured packing are conducted using OpenFOAM. The RTD is analyzed in terms of residence time distribution function, mean residence time, and variance. Effects of the diffusivity and flow rates on RTD are extensively studied, and the dispersion coefficient is calculated using a one-dimensional axial dispersion model. Furthermore, RTDs computed in a smaller domain are extrapolated to a larger domain using a convolution integral. The computed and corresponding CFD models derived from the convolution integral match well at different flow rates and domain sizes. A comparison of RTD among different packing designs also is presented at a fixed number of repeating units and different flow rates.},
doi = {10.1016/j.ijggc.2018.11.001},
journal = {International Journal of Greenhouse Gas Control},
issn = {1750-5836},
number = C,
volume = 79,
place = {United States},
year = {2018},
month = {12}
}