基于自热再生的隔壁塔深冷空分工艺设计及优化

Design and optimization of cryogenic air separation process with dividing wall column based on self-heat regeneration

工业气体应用广泛,当前常用深冷精馏法获取,工艺能耗巨大,其中压缩和精馏部分的耗能占比最大。基于自热再生和隔壁塔技术,提出了一种隔壁塔深冷空分方案,用单塔精馏空分过程代替双塔精馏空分过程,利用自热再生优化过程换热。利用夹点原理对优化前后的工艺进行能量分析,并从总能量消耗(TEC)、二氧化碳排放量([CO_(2)]em)、年度总费用(TAC)三个角度分别进行评价。结果表明,基于自热再生的隔壁塔深冷空分工艺较常规空分工艺,制氧消耗降低了26.19%,二氧化碳排放减少了25.18%,年度总费用降低了31.93%。利用自热再生技术和隔壁塔技术优化后的空分工艺,在节能、经济以及环保方面表现出更强的优越性。

Industrial gases commonly obtained by cryogenic distillation are widely used currently.The energy consumption of the process is always huge,and the energy consumption of compression and rectification accounts for the largest proportion.A cryogenic air separation process with a dividing wall column was proposed based on the self-heat regeneration,in which the double-tower distillation air separation process was replaced by a single-tower distillation process applying the self-heat regeneration technology to complete the process of heat exchange.The energy of the process was analyzed by the pinch principle,and the total energy consumption(TEC),carbon dioxide emissions([CO_(2)]em),and total annual cost(TAC)were evaluated,respectively.The results showed the cryogenic air separation process based on the self-heating regeneration in the dividing wall column reduced energy consumption for oxygen production by 26.19%,CO_(2) emission by 25.18%,and the TAC by 31.93%.The optimized air separation process using self-heat regeneration technology and dividing wall column technology has shown stronger advantages in energy saving,economy,and environmental protection.