Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

doi:10.1016/j.cjche.2023.10.009

中国化学工程学报 ›› 2024, Vol. 66 ›› Issue (2): 224-237.DOI: 10.1016/j.cjche.2023.10.009

• Full Length Article • 上一篇下一篇

Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

Wenchang Wu^1,2, Kefan Yu^1,2, Liang Zhao^1,2, Hui Dong^1,2

1. SEP Key Laboratory of Eco-industry, School of Metallurgy, Northeastern University, Shenyang 110819, China;
2. Liaoning Engineering Research Center of Energy Saving and Green Low Carbon Technology for Process Industry, Northeastern University, Shenyang 110819, China

收稿日期:2023-08-15 修回日期:2023-10-23 出版日期:2024-02-28 发布日期:2024-04-20
通讯作者: Hui Dong,E-mail:2110635@stu.neu.edu.cn
基金资助:
We would like to acknowledge the financial support for this work provided by the National Key R&D Program of China‘Technologies and Integrated Application of Magnesite Waste Utilization for High-Valued Chemicals and Materials’(2020YFC1909303).

Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

Wenchang Wu^1,2, Kefan Yu^1,2, Liang Zhao^1,2, Hui Dong^1,2

1. SEP Key Laboratory of Eco-industry, School of Metallurgy, Northeastern University, Shenyang 110819, China;
2. Liaoning Engineering Research Center of Energy Saving and Green Low Carbon Technology for Process Industry, Northeastern University, Shenyang 110819, China

Received:2023-08-15 Revised:2023-10-23 Online:2024-02-28 Published:2024-04-20
Contact: Hui Dong,E-mail:2110635@stu.neu.edu.cn
Supported by:
We would like to acknowledge the financial support for this work provided by the National Key R&D Program of China‘Technologies and Integrated Application of Magnesite Waste Utilization for High-Valued Chemicals and Materials’(2020YFC1909303).

摘要/Abstract

摘要： This study developed a numerical model to efficiently treat solid waste magnesium nitrate hydrate through multi-step chemical reactions. The model simulates two-phase flow, heat, and mass transfer processes in a pyrolysis furnace to improve the decomposition rate of magnesium nitrate. The performance of multi-nozzle and single-nozzle injection methods was evaluated, and the effects of primary and secondary nozzle flow ratios, velocity ratios, and secondary nozzle inclination angles on the decomposition rate were investigated. Results indicate that multi-nozzle injection has a higher conversion efficiency and decomposition rate than single-nozzle injection, with a 10.3 % higher conversion rate under the design parameters. The decomposition rate is primarily dependent on the average residence time of particles, which can be increased by decreasing flow rate and velocity ratios and increasing the inclination angle of secondary nozzles. The optimal parameters are injection flow ratio of 40 %, injection velocity ratio of 0.6, and secondary nozzle inclination of 30°, corresponding to a maximum decomposition rate of 99.33 %.

关键词: Multi-nozzle, Computational fluid dynamics, Thermal decomposition reaction, Pyrolysis furnace

Abstract: This study developed a numerical model to efficiently treat solid waste magnesium nitrate hydrate through multi-step chemical reactions. The model simulates two-phase flow, heat, and mass transfer processes in a pyrolysis furnace to improve the decomposition rate of magnesium nitrate. The performance of multi-nozzle and single-nozzle injection methods was evaluated, and the effects of primary and secondary nozzle flow ratios, velocity ratios, and secondary nozzle inclination angles on the decomposition rate were investigated. Results indicate that multi-nozzle injection has a higher conversion efficiency and decomposition rate than single-nozzle injection, with a 10.3 % higher conversion rate under the design parameters. The decomposition rate is primarily dependent on the average residence time of particles, which can be increased by decreasing flow rate and velocity ratios and increasing the inclination angle of secondary nozzles. The optimal parameters are injection flow ratio of 40 %, injection velocity ratio of 0.6, and secondary nozzle inclination of 30°, corresponding to a maximum decomposition rate of 99.33 %.

Key words: Multi-nozzle, Computational fluid dynamics, Thermal decomposition reaction, Pyrolysis furnace

Wenchang Wu, Kefan Yu, Liang Zhao, Hui Dong. Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods[J]. 中国化学工程学报, 2024, 66(2): 224-237.

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Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

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