Numerical study on the distribution of flue gas residence time in the desulfurization and denitrification system by the optimization of the model
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Junjie Wang
,
Jianfang Wang
Abstract
During the operation of the CSCR activated carbon desulfurization and denitrification flue gas purification system, due to the unreasonable design of flue gas pipe diameter and the uneven distribution of activated carbon porosity, the uniformity of flue gas distribution is prone to problems, which affects flue gas removal efficiency and increases operating costs. In this article, the Fluent software was used to establish a three-dimensional numerical model of the flue gas purification system, and the flow characteristics of the flue gas were studied by continuously optimizing the structure of the system model. The effects of different pipe diameters, the accumulation method of activated carbon in the desulfurization and denitration module and the distribution of porosity on the flue gas are analyzed, and the effects on the average residence time and variance of flue gas were further analyzed. The results show that the average residence time, the variance, the dead volume fraction, and well-mixed volume decreased, while the dispersed plug volume fraction increased for a module after optimization. The average residence time and the dispersed plug volume fraction decreased. While the variance, the dead volume fraction, and well-mixed volume fraction increased for the system after optimization.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: U1960205
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The work is financially supported by National Natural Science Foundation of China(U1960205).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
Cao, J., B. S. Jin, W. Q. Zhong, K. Wang, M. Tao, Y. Zhang, and H. Tao. 2013. “Numerical Simulation of the Particle Flow Characteristic in Cross-Flow Moving Bed with Internals.” Journal of Mechanical Engineering 49 (10): 144–50.10.3901/JME.2013.10.144Search in Google Scholar
Gao, J. X., J. Liu, Y. Zeng, S. P. Zhai, Y. M. Fu, and C. X. Xin. 2012. “Application and Analysis of Dry Activated Coke (Carbon) Process of Sintering Flue Gas Purification Technology in Iron and Steel Industry.” Sintering and Pelletizing 37 (02): 61–6, doi:https://doi.org/10.13403/j.sjqt.2012.02.017.Search in Google Scholar
He, T. 2014. “The Study of Gas-Solid Two-phase Flowing Characteristics in the Cross Moving Bed.” Science Technology and Engineering 14 (11): 103–6+122, doi:https://doi.org/10.3969/j.issn.1671-1815.2014.11.021.Search in Google Scholar
Kumar, A., D. Mazumdar, and S. C. Koria. 2008. “Modeling of Fluid Flow and Residence Time Distribution in a Four-Strand Tundish for Enhancing Inclusion Removal.” ISIJ International 48 (1): 38–47, https://doi.org/10.2355/isijinternational.48.38.Search in Google Scholar
Li, Y. R., Y. T. Lin, B. Wang, S. Ding, F. Qi, and T. Y. Zhu. 2019. “Carbon Consumption of Activated Coke in the Thermal Regeneration Process for Flue Gas Desulfurization and Denitrification.” Journal of Cleaner Production 228: 1391–400, doi:https://doi.org/10.1016/j.jclepro.2019.04.225.Search in Google Scholar
Li, Q. Y., Y. Q. Hou, X. J. Han, J. C. Wang, Y. J. Liu, N. Xiang, and Z. G. Huang. 2020. “Promotional Effect of Cyclic Desulfurization and Regeneration for Selective Catalytic Reduction of NO by NH3 over Activated Carbon.” Journal of Cleaner Production 249: 119392, doi:https://doi.org/10.1016/j.jclepro.2019.119392.Search in Google Scholar
Liao, J. Y., M. Zhou, and X. M. Li. 2012. “Application of Activated Carbon Purification Technology in the Field of Sintering Flue Gas Control.” Sintering and Pelletizing 37 (04): 61–3, doi:https://doi.org/10.13403/j.sjqt.2012.04.019.Search in Google Scholar
Liu, Q. Y., J. S. Guan, J. G. Li, and C. H. Li. 2003. “SO2 Removal from Flue Gas by Activated Semi-cokes: 2. Effects of Physical Structures and Chemical Properties on SO2 Removal Activity.” Carbon 41 (12): 2225–30, doi:https://doi.org/10.1016/S0008-6223(03)00230-6.Search in Google Scholar
Liu, Y. T., Y. R. Li, Z. C. Xu, J. Xiong, and T. Y. Zhu. 2018. “Transformation of Functional Groups in the Reduction of NO with NH3 over Nitrogen-Enriched Activated Carbons.” Fuel 223: 312–23, doi:https://doi.org/10.1016/j.fuel.2018.01.092.Search in Google Scholar
Sahai, Y., and T. Emi. 1996. “Melt flow characterization in continuous casting tundishes.” ISIJ international 36 (6): 667–72, doi:https://doi.org/10.2355/isijinternational.36.667.Search in Google Scholar
Wang, H. H., Y. S. Liu, Z. Y. Li, and X. Yang. 2015. “Kinetic Models and Numerical Simulation of SO2 Adsorption on Activated Carbon.” Journal of China Coal Society 40 (01): 203–11, doi:https://doi.org/10.13225/j.cnki.jccs.2014.0062.Search in Google Scholar
Ye, H. D., J. C. Wei, and C. Q. Liu. 2015. “Research and Application of Activated Carbon Method for Sintering Flue Gas Purification.” In Proceedings of the 10th CSM Steel Congress and the 6th Baosteel Biennial Academic Conference III, 6. BeiJing: Metallurgical Industry Press.Search in Google Scholar
Yu, X. B. 2014. Numerical Simulation of Gas Distribution in Oxygen Blast Furnace. Northeastern University.Search in Google Scholar
Zhang, S., Y. R. Li, et al.. 2019a. “Optimization of the Internal Structure in the Reactor Based on the Flue Gas Purification Technology with Activated Carbon.” In Environmental Engineering 2019 National Academic Annual Conference Proceedings, 4.Search in Google Scholar
Zhang, C. Q., J. Gao, L. Lyu, and L. He. 2019b. “Resistance Characteristics of Bed Packed with Mono-Size Cylindrical Particles.” Journal of Chemical Industry 70 (11): 4181–90, https://doi.org/10.11949/0438-1157.20190457.Search in Google Scholar
Zhou, H., K. Xu, Y. F. Hu, S. L. Wu, M. Y. Kou, and Y. W. Luo. 2020. “Numerical Study on the Influence of Center Gas Supply Device on Gas-Solid Residence Time Distribution in COREX Shaft Furnace.” Particulate Science and Technology 39 (7): 887–95, doi:https://doi.org/10.1080/02726351.2021.1871793.Search in Google Scholar
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Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Special Issue Articles
- Preface: Special issue of “Metallurgical Reaction Engineering”
- The relationship between melt structure and viscosity: the effect of different fluxes on CaO–SiO2 slags
- Analysis of nozzle clogging position in a continuous casting mold
- Numerical simulation of iron ore sintering process with coke oven gas injection and oxygen enrichment
- Bubble behavior and evolution characteristics in the RH riser tube-vacuum chamber
- Combined models with tanks in series for characterization of tundish flows in continuous casting of steel
- Numerical simulation of inner characteristics in COREX shaft furnace with center gas distribution: influence of bed structure
- Effects of operation parameters on particle mixing performance in a horizontal high shear mixer
- Numerical study on the distribution of flue gas residence time in the desulfurization and denitrification system by the optimization of the model
- Numerical investigation of scrap melting in high-carbon hot metal
