Design Of High Temperature Atomization Systems For High Speed Cellulose Acetate Tow Production Lines

Cellulose acetate tow is an important raw material for filter tips in the tobacco industry,and the heat-moisture treatment in the processing process can directly affect the quality of the tow.Therefore,in this thesis,theoretical research and engineering design are carried out on the high-speed tow production line high-temperature atomization system in the heat-moisture treatment process,and a set of production line high-temperature atomization system engineering with low energy consumption,small atomized particles,and uniform atomization is realized.First,the domestic and foreign fiber heating and humidifying equipment are summarized and analyzed.According to the functional requirements of the high-temperature atomization system of the high-speed tow production line,the swirl atomization nozzle is selected.At the same time,the inlet pressure range of the atomizing nozzle is determined according to the atomization temperature and particle size,and the flow field of the swirl atomizing nozzle is analyzed by FLUENT software,and the velocity cloud map and pressure cloud map are obtained influence of nozzle outlet pressure.Secondly,in order to increase the moist heat effect of the swirl atomizing nozzle,the atomization and the insulation box are combined in the system design,and the atomization device is placed in a semi-closed insulation box.The eddy current formed by the high-speed moving tow in the incubator is simulated by double coupling of the temperature field and flow field.The simulation analysis is carried out for the incubator under different airflow velocities,and the velocity vector nephogram and the distribution of droplets are analyzed.The central surface temperature and component data obtained from the simulation under different airflow velocities have important reference values for engineering practice.When passing through the incubator,the atomization is uniform,and the temperature is consistent.Thirdly,based on the above theoretical research,the schematic diagram of the heat-moisture process of the high-temperature atomization system,the design of the equipment assembly diagram,the design of the measurement and control system,and the design of the safety protection have been completed.On this basis,a test bench including PLC,touch screen,atomizing pump,pressure sensor,flow sensor,temperature sensor,and other components is assembled and built,and the closed-loop PID control function of temperature setting and heating system and the pressure adjustment function of atomizing nozzle are completed.Finally,on the high-temperature atomization system experimental platform built,the non-contact infrared temperature measurement module is used to carry out the measurement experiment of the temperature field and flow field in the incubator when the tow moved at high-speed,and the actual temperature field in the incubator is measured.In comparison,the relative error between the experimental temperature value and the simulated value is 6.26% at maximum and 5.67% at minimum.The theory and experiment are combined to optimize and improve the high-temperature atomization system of the high-speed tow production line,and increase the thermal insulation design,sealing design,and explosion-proof design.The equipment runs stably on site,completes the heat and humidity function,the center plane temperature is stable,and the atomized particles are uniform,which meets the production needs of the enterprise.