空分装置有效能分析研究

Exergy Analysis for Air Separation Unit

分析方法是低温法精馏过程分析,也是空气分离过程节能分析的主要方法。本文使用空分有效能分析(EAASU)系统对唐钢气体公司的40000 m3/h(标准)空分装置进行了分析,其设计工况的流程效率为45.25%。分析结果表明,气态产品中氧的摩尔最大,液态产品中氩的摩尔最大;同种产品中液态摩尔大于气态摩尔。在相同环境条件和加工空气量的情况下,增加液态产品的产量,尤其是液氩的产量,可以提高空分装置的流程效率。以设计工况作为参照,基于EAASU软件进一步分析了不同产量的流程效率,即当液体总产量增加9%,则流程效率提高0.65%以上;气氧产量增加10%,则流程效率可提高1.56%。

An exergy analysis is perlormea to analyse the possiblities of fele saving in the cryogennic distillation proccss ,which is the main method of air separation unit （ASU）. The product exergy analysis for an actual 40000 Nm3/h ASU of Tangshan TangSteel Gases Corporation Limited is evaluated with the developed exergy analysis of ASU （EAASU） system. The process exergy efficiency under design operation of the ASU is 45.25%. The calculation result shows, the molar exergy contained in oxygen is the largest among all gaseous products, liquid argon contains the largest molar exergy among all liquid products, and liquid products get larger exergy value than the gaseous in the same product. In a same environmental condition and with equivalent air feed mass flow, the process would be more efficient on the rated load of expander by improving output of liquid production, especially improving output of liquid Argon. Reference to design conditions of ASU, the process exergy efficiency under different product combination based on EAASU system was also analyzed. When output of liquid production increased by 9% of design operation, the process exergy efficiency would be improved by 0.65% at least. When output of gas oxygen production increased by 10% of design operation, the process exergy efficiency can be improved by 1.56%.