Study On Structure Optimization And Control Of Two-bed Pressure Swing Adsorption Oxygen Generation System

Pressure swing adsorption(PSA)oxygen generation technology,as a kind of air separation oxygen generation technology,has attracted more and more attention from various oxygen production industries.The two-bed pressure swing adsorption oxygen generation system studied in this paper can generally produce oxygen-enriched gas with oxygen concentration of more than 90%.Compared with other oxygen generation technologies,it has the characteristics of strong applicability,high reliability,low cost and high efficiency.However,the gas oxygen concentration of the system product is affected by internal and external factors such as molecular sieve material,atmospheric pressure and temperature environment.With the continuous research of PSA oxygen generation system,it is found that the cycle period of mutual oxygen generation of two molecular sieve beds and the diameter of flushing sizing hole have a great impact on the oxygen concentration of the system product gas in the actual oxygen generation process.Therefore,this paper takes the two-bed pressure swing adsorption oxygen generation system as the research object,carries out modeling analysis on the key structure of the system,and on the basis of optimizing the PID control molecular sieve bed cyclic adsorption and desorption,explores the optimal oxygen generation cycle(including pressure equalization time)and the optimal diameter of the flushing sizing hole of the pressure swing adsorption oxygen generation system through simulation experiments of different oxygen generation cycle(including pressure equalization time)and different flushing sizing hole diameters,Find out the influence of the structure and control parameters of the oxygen generation system on the oxygen generation efficiency.Main research contents:(1)The studied two-bed PSA oxygen generation system selected piston air compressor and SXSDM Li molecular sieve,designed aluminum alloy tube with diameter of 87 mm,effective height of 380 mm(height-diameter ratio of molecular sieve bed is 4.37)as the molecular sieve bed,and aluminum alloy tube with inner diameter of 41 mm,wall thickness of 3 mm,and height of 140 mm as the gas storage tank material;Because SXSDM type Li molecular sieve material has good adsorption performance under the pressure of 0.08-0.17 MPa,this paper systematically selects it as molecular sieve in the molecular sieve bed.(2)The static structural module in Ansys is used to carry out corresponding mechanical simulation on the molecular sieve bed and gas storage tank,which are the key structures of the two-bed PSA oxygen generation system.When the input pressure is 0.08 and 0.17 MPa,the deformation of molecular sieve bed and gas storage tank is analyzed.(3)Taking the ground miniature oxygen generator as the experimental object,the algorithm modeling of the air compressor,molecular sieve bed,gas storage tank and the whole,which are the key components of the two-bed PSA oxygen generation system,is carried out,and the simulation comparison of the closed-loop system without any control,conventional PID control and fuzzy parameter self-adjusting PID control is carried out by using the Simulink module in Matlab,and finally a relatively suitable stable control is obtained.(4)Based on the research of the overall structure design,the simulation experiment of the system is carried out.The experimental results show that under certain conditions,the optimal cycle of oxygen generation is 8.0s(pressure equalizing time is 1.3s),and the optimal diameter of flushing sizing hole is 0.8mm.Figure [42] table [5] reference [70]...