我车间液氮储存原采用4台zy—5000型普通低温储槽。该储槽由于对空气不密封,所以在低温下,空气中的水份大量结聚在保温材料碳酸镁或珠光砂层里,造成保温效果差,液氮大量蒸发放空,并为此报废一台zy—5000型低温储槽。考虑到经济效益,改用真空粉末低温储槽。其结构示意图如图1所示。其内筒采用δ=4mm的1Cr18Ni9Ti I plant the original use of liquid nitrogen storage 4 zy-5000 ordinary cryogenic storage tank. The tank because of the air is not sealed, so at low temperatures, a large number of water in the air knot in the insulation material of magnesium carbonate or pearl sand layer, resulting in poor insulation, a large number of liquid nitrogen evaporation emptying, and to scrap one zy-5000-type cryogenic storage tank. Taking into account the economic benefits, use vacuum powder cryogenic storage tank. The structure diagram shown in Figure 1. The inner cylinder with δ = 4mm 1Cr18Ni9Ti