摘要
提出了利用液化天然气(LNG)冷能空分新流程,产品是用于满足电厂富氧燃烧的气态富氧空气。空气视为N2(79.1 mol%)和O2(20.9 mol%)二元混合气体,采用Aspen Plus软件进行了流程模拟,物性方法选择Peng-Robinson方程。模拟结果表明,生产95.08 mol%富氧空气的能耗是0.667 kW.h/(kg.O2),液化天然气(LNG)的消耗量是87.64 mol/(kg.O2)。与文献[7]生产多种液态产品模拟结果比较,单位氧气的能耗大致相等,LNG消耗减少约50%,精馏塔冷凝蒸发器两侧的传热温差从1.2 K增大到2.8 K,可大大减小换热器的面积。
A novel process for air separation by utilization of liquefied natural gas cold energy was proposed based on the existing studies,in which the product is oxygen-enriched air for oxy-combustion in power plant.The process simulation was carried out by Aspen Plus software with the simulated air（N2,79,1 mol%,O2,20.9 mol%） and Peng-Robinson equation was chosen for property method.The results show that energy consumption is 0.667 kW·h/（kg·O2）and the LNG consumption is 87.64 mol/（kg·O2）for production of air with 95.08 mol% oxygen.A comparison with reference[7]was also carried out,the results indicate that as for producing per kg oxygen,energy consumption for both process are equal and LNG amount could reduce roughly 50%.The heat transfer temperature difference in condenser in cryogenic distillation column increased from 1.2 K to 2.8 K,which could lead to a greatly reduction in heat exchanger areas.
出处
《节能技术》
CAS
2011年第3期211-213,218,共4页
Energy Conservation Technology
基金
唐山LNG项目冷能利用可行性研究报告
关键词
富氧空气
液化天然气
冷能利用
低温精馏
流程模拟
oxygen-enriched air
liquefied natural gas
cold energy utilization
cryogenic distillation
process simulation
