Flow Field Analysis And Design Of Supercritical Fluid Jig Dyeing Device

Supercritical fluids dyeing(SFD)technology can effectively solve the problems of water waste and wastewater pollution in the traditional printing and dyeing industry.which has broad application prospects and will provide sustainable development for the printing and dyeing industry.The author summarizes the development of SFD dyeing technology from the aspects of supercritical CO2(SC-CO2)dyeing process,dyeing device,main dyeing equipment and numerical simulation in flow field analysis.Summarize the design points of jigger and give the structure of the industrial jigger prototype.The numerical simulation scheme of the internal flow field of the jigger is designed,including:making reasonable assumptions;establishing 3D geometric model;dividing structured grid;selecting control equation;setting boundary conditions.The fabric,metal mesh and porous plate structure are simplified into porous media,and the porous jump model is used to simulate the pressure drop characteristics.The simulation results show that the dye solution can circulate inside the jigger.The development of the jigger prototype was completed.The experiment of dyeing polyester fabric with dispersing red 60 was carried out on the dyeing machine prototype.And design experiment scheme compared the dyeing effect under different dyeing time.The results showed that the dyeing machine can dye the fabric stably and evenly.At the same time,the experimental results are consistent with the analysis and conclusion of the numerical simulation,indicating the feasibility of the simulation method.Analyze the deficiencies and give the optimal design of internal structure of the jigger prototype.Based on the optimized structure,the three-dimensional model is built for numerical simulation,the influence of circulating flow and fabric parameters and the regulation of dye solution distributor parameters on the flow field distribution are further analyzed.Combined with the experiment results of the jigger prototype and the simulation results of the flow field,an improved jigger structure with more convenient operation and higher production efficiency was designed,and the structure and design method of the key components were given,including the quick-opening structure,built-in dye box,fabric loading and unloading structure,transmission sealing structure,built-in fan and dye solution distributor.