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绕管式换热器气液进料混合特性数值模拟与实验研究

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绕管式换热器是连续重整装置的关键设备之一,其石脑油与氢气的气液混合性能及效果直接影响管内结晶堵塞程度.针对现役重整绕管式换热器因气液混合不均,导致管内铵盐等物质结晶堵塞造成管程压降升高、换热效率差等问题,开展了该换热器混合装置气液混合性能实验研究.对液体喷射结构开展优化设计,分别对原始结构液体喷射与优化结构液体喷雾两种方式进行实验研究以及CFD数值分析,确定不同结构对气液混合效果的影响.通过铵盐沉积实验研究,开展绕管式换热器堵塞机理分析.实验与模拟结果表明,水平喷嘴雾化气液混合效果优于圆孔射流结构,且喷嘴朝向角度越大其气液均匀度越差,铵盐结晶与绕管式换热器运行工况相关,研究成果对连续重整进料装置整体优化提供了重要的理论依据.
Numerical Simulation and Experimental Research on the Mixing Characteristics of Gas-liquid Feed of Tubular Heat Exchanger
The tube-wound heat exchanger is one of the key equipment of continuous reforming units,and its gas-liquid mixing performance and effect of naphtha and hydrogen directly affect the degree of crystallization and blockage in the tube.Aiming at the uneven gas-liquid mixing of the existing reforming tube-wound heat exchangers,which leads to the crystallization and blockage of ammonium salts and other substances in the tube,resulting in the increase of pressure drop in the tube and poor heat transfer efficiency.This paper carries out experimental research on the gas-liquid mixing performance of the mixing device.In this paper,the optimal design of the liquid injection structure is carried out,and the experimental research and CFD numerical analysis of the original liquid injection structure and the optimized liquid spray structure are carried out to determine the influence of different structures on the gas-liquid mixing performance.Through the experimental study of ammonium salt deposition,the clogging mechanism analysis of the tube-wound heat exchanger is carried out.The experimental and simulation results show that the gas-liquid mixing performance of horizontal nozzle atomization is better than that of the round hole jet structure;the larger the nozzle facing angle,the worse the gas-liquid uniformity;and the ammonium salt crystallization is related to the operating conditions of the tube-wound heat exchanger.The results of the research provide an important theoretical basis for the optimization of the continuous reforming feeding device.

tube-wound heat exchangergas-liquid mixingnozzle atomizationammonium salt crystallizationstructure optimization

李世伟

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华东理工大学,上海 200237

绕管换热器 气液混合 喷嘴雾化 铵盐结晶 结构优化

2024

机械设计与研究
上海交通大学

机械设计与研究

CSTPCD北大核心
影响因子:0.531
ISSN:1006-2343
年,卷(期):2024.40(3)