LNG冷能利用与废旧橡胶低温粉碎的集成优化

为降低废旧橡胶低温粉碎生产精细胶粉的能耗，提出了集成利用LNG冷能的废旧橡胶液氮低温粉碎法和低温氮气粉碎法的模型，研究结果表明：⑴ 空分装置利用LNG冷能，可将液氮等液体空分产品的生产能耗降低60.2％，利用LNG冷能可节省用电244.3kW•h/t，冷能利用的火用效率达到60.7％，可为废旧橡胶低温粉碎装置提供廉价的液氮；⑵ 如果紧临LNG接收站建立废旧低温粉碎装置，直接空分副产的氮气和LNG冷能生产低温氮气用于废旧橡胶的冷冻和粉碎，相对空气涡轮膨胀机制冷法，利用1.0t LNG携带的冷能可节省用电342.9kWh，冷能利用的火用效率为63.4％。

Integration and optimization of LNG cold energy utilization in waste rubber cryogenic comminution

In order to reduce the energy consumption of rubber powder through cryogenic comminution of waste rubber, two integration and optimization models of LNG cold energy utilization in waste rubber cryogenic comminution were proposed, which including the method of crushing under liquid nitrogen freezing and cryogenic comminution method of cold nitrogen refrigeration. The research showed that, the unit power consumption of liquid air separation products by using LNG cold energy reduced 60.2% of that of traditional air separation device. The saved power by using unit LNG cold energy to manufacture liquid nitrogen could reached 244.3 kW•h/t, and the exergy efficience of LNG cold utilization has achieved 60.7%, and a large number of lower-cost liquid nitrogen could been provided to rubber powder plant. If the cryogenic crushing device of waste rubber was situated near LNG terminal, the cold nitrogen by recovered cryogenic energy of LNG could been provided to rubber powder plant to refrigerate waste rubber. Compared with traditional grinding method under refrigeration of air turbine, it could saved 342.9 kW•h power by using cold energyof one ton LNG in waste rubber cryogenic comminution under cold nitrogen refrigeration, and the exergy efficience of LNG cold utilization has achieved 63.4%.