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一、问题提出 我厂主工艺生产的特点决定了液体氮必须得到保证,原有液氮贮槽4台(型号ZYl/5000型),用来贮存液体氮,贮槽单台价值23.800元。系60年代初期产品,保温技术落后,且长期使用,设备老化,外壳腐蚀严重,局部已穿孔,有严重的结霜迹象,绝热效果较差。虽对保温材料进行多次更新,(开始为微孔泡膜塑料,后改为珠光砂),但保温性能仍然不良,其静蒸发损失多达12升/时,单台年蒸发液氮损失为105120升,按液氮成本0.55元/升计算,价值57816
First, the question put forward the characteristics of our factory production process determines the liquid nitrogen must be guaranteed, the original liquid nitrogen storage tank 4 (Model ZYl / 5000 type), used to store liquid nitrogen, storage tank single value 23.800 yuan. Department of the early 60’s products, insulation technology behind, and long-term use, aging equipment, shell corrosion serious, local perforation, there are signs of severe frost, poor insulation effect. Although many updates have been made to the thermal insulation material (starting from microporous foam plastic and later to pearlized sand), the thermal insulation performance is still poor with a loss of static evaporation of up to 12 liters / h 105120 liters, according to the cost of liquid nitrogen 0.55 yuan / liter basis, the value of 57,816