摘要
Modified atmosphere packaging(MAP)technology preserves food by regulating packaging gas composition,particularly for perishables such as fruits and vegetables,thereby significantly extending shelf life.Current gas blending systems,however,face critical limitations in concentration accuracy,operational stability,and costeffectiveness under dynamic production requirements.This study introduces an innovative closed-loop controlled ternary(CO_(2)/O_(2)/N_(2))gas mixing system,integrating the ideal gas law and Dalton’s law of partial pressures.The system employs real-time concentration monitoring via integrated sensors and adaptive valve adjustments to achieve high-precision gas formulation.Experimental validation under multiple target concentrations(5%-30%O_(2),0%-30%CO_(2),at 0.45-0.60 MPa and 15-45℃)demonstrates exceptional precision,with relative deviations of CO_(2) and O_(2) reduced to 0.75%and 0.72%,respectively,surpassing the industrial standard of±1.5%-2%for static gas mixers and meeting high industrial standards.A modular architecture incorporating localized MEMS sensors(replacing imported units)reduced unit manufacturing costs by 38%(from$12,500 to$7750).These advancements provide a robust technical framework for expanding MAP utilization in food preservation,pharmaceutical packaging,and industrial gas production,establishing critical benchmarks for precision-controlled gas regulation systems.
基金
supported by the National Natural Science Founda-tion of China(Grant No.32260617)
the Joint Fund of Natural Sci-ence Foundation of Ningxia Hui Autonomous Region(Grant No.2024AAC03110).
