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