Numerical Study On Flow Distribution Characteristics Within Modular Molecular Sieve Adsorber And Plate-fin Heat Exchanger Core

Molecular sieve adsorber and plate-fin heat exchanger is the key to ensure the safeand stable operation of air separation equipment. The flow distribution characteristics ofmolecular sieve bed layer and plate-fin heat exchanger core body directly affect theadsorption of the water, carbon dioxide and other impurities in the air of molecular sieveadsorber and the heat transfer performance of plate fin heat exchanger, so it has veryimportant significance to research the characteristics of air distribution in the molecularsieve bed layer and the plate-fin heat exchanger core body.In this paper, the molecular sieve bed layer and the plate-fin heat exchanger corebody are regarded as porous continuous medium containing a lot of pore,and they aresimplified as porous media model. combined with numerical simulation method the flowdistribution characteristics of molecular sieve bed layer and plate-fin heat exchanger corebody are studied.In this paper, a new type of vertical modularity molecular sieve adsorber wasdesigned by overlaying two or more traditional vertical axial flow molecular sieveadsorber, and the airflow distribution characteristics of this new type of molecular sieveadsorber was studied. The results in the study of the distribution of the airflow in singlestage adsorber show that the air distribution inside molecular sieve adsorber bed is unevendue to the changes of import and export pipe position, so it is necessary to add air flowuniform device, and porous plate is superior to the porous pipe, and the best place ofporous plate was studied. The results in the research of two stages modular air flowdistribution show that the airflow distribution when the import and export air flow in theopposite direction is more uniform than when the airflow direction of import and exportair flow in the same direction.In this paper the flow channel of plate fin heat exchanger was regarded as the pore ofporous medium and other structure as a skeleton of porous media. Respectively usingporous jump model, multi-channel zone model and the integral of anisotropic porous zone model to simplify the plate-fin heat exchanger core body, The distribution of fluidproperties of single strand in the body was studied by setting up the calculation modelincluding the head and core body. The results show that the anisotropic whole porousmedia region model can reflect the information of the flow distribution in the flow field,and using this model to simplify the plate-fin heat exchanger core body is reasonable andeffective. The research provides a theoretical reference basis for plate-fin heat exchangerstructure design in the future.