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气调贮藏是当前果蔬贮藏中被认为效果最好的方法。它是在一定的低温条件下,通过人工或自然降低贮藏环境中氧的浓度,提高二氧化碳的浓度,以达到抑制果蔬的新陈代谢和微生物活动的目的。目前用于果蔬贮藏中调节氧和二氧化碳的气调机有燃烧式、裂解氨式和分子筛吸附式。碳分子筛是由煤经过精选、粉碎、成型、造孔、活化学方法加工而成。分离气体的原理是通过碳分子筛对不同气体分子吸附能力大小和不同运动学直径的气体分子向碳分子筛微孔内扩散速度差异来实现。我们知道氧的运动学直径为3.5A°,氮的运动学直径为3.7°A,氧的扩散速度大于氮的扩散速度。当空气进入分子筛时,分子筛微孔先吸附氧,而在气相中富集氮,这氮就是分离出来我们所需要的产品气。
Atmospheric storage is currently considered the best fruit and vegetable storage methods. Under certain low temperature conditions, it can reduce the concentration of oxygen in the storage environment and increase the concentration of carbon dioxide by artificially or naturally to achieve the purpose of inhibiting the metabolism and microbial activities of fruits and vegetables. Currently used for storage of fruits and vegetables in the regulation of oxygen and carbon dioxide gas conditioner combustion, cracking ammonia and molecular sieve adsorption. Carbon molecular sieve is made of coal through the selection, crushing, forming, making holes, live chemical processing. The principle of gas separation is achieved by the carbon molecular sieve diffusion rate difference of gas molecules with different gas molecules adsorption capacity and different kinetic diameters to carbon molecular sieve micropore. We know that the kinematic diameter of oxygen is 3.5A °, the kinetic diameter of nitrogen is 3.7 ° A, and the oxygen diffusion rate is greater than the nitrogen diffusion rate. When air enters the molecular sieve, the pores of the molecular sieve adsorb oxygen first, and nitrogen is enriched in the gas phase. This nitrogen is the product gas we need to separate.