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

作　　者：Wenchang Wu Kefan Yu Liang Zhao Hui Dong 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2024年第2期224-237,共14页中国化学工程学报（英文版）

基　　金：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：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 

分 类 号：X705[环境科学与工程—环境工程]