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Title: Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system

Abstract

A hybrid Eulerian-Lagrangian model was developed to simulate gas-droplet-particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. The effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 {mu} m and an optimal particle injection location corresponding to the maximum humidification efficiency in thismore » paper.« less

Authors:
; ; ;  [1]
  1. Shanghai Jiao Tong University, Shanghai (China). School for Mechanical Engineering
Publication Date:
OSTI Identifier:
21073798
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 47; Journal Issue: 14; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FLUE GAS; DESULFURIZATION; MULTIPHASE FLOW; FLOW MODELS; SPRAYS; DROPLETS; ADSORBENTS; FLOW RATE; OPTIMIZATION; WATER

Citation Formats

Zhou, Y G, Cao, W C, Wang, L, and Zhang, M C. Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. United States: N. p., 2008. Web. doi:10.1021/ie071494c.
Zhou, Y G, Cao, W C, Wang, L, & Zhang, M C. Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. United States. https://doi.org/10.1021/ie071494c
Zhou, Y G, Cao, W C, Wang, L, and Zhang, M C. 2008. "Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system". United States. https://doi.org/10.1021/ie071494c.
@article{osti_21073798,
title = {Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system},
author = {Zhou, Y G and Cao, W C and Wang, L and Zhang, M C},
abstractNote = {A hybrid Eulerian-Lagrangian model was developed to simulate gas-droplet-particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. The effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 {mu} m and an optimal particle injection location corresponding to the maximum humidification efficiency in this paper.},
doi = {10.1021/ie071494c},
url = {https://www.osti.gov/biblio/21073798}, journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 14,
volume = 47,
place = {United States},
year = {Tue Jul 15 00:00:00 EDT 2008},
month = {Tue Jul 15 00:00:00 EDT 2008}
}