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过程工程学报 ›› 2020, Vol. 20 ›› Issue (7): 822-831.DOI: 10.12034/j.issn.1009-606X.219290

• 过程与工艺 • 上一篇    下一篇

基于链式循环二氧化碳重整的甲烷制甲醇过程火用分析

孙 灵, 诸 林*, 何阳东   

  1. 西南石油大学化学化工学院,四川 成都 610500
  • 收稿日期:2019-09-04 修回日期:2019-11-15 出版日期:2020-07-22 发布日期:2020-07-21
  • 通讯作者: 诸林
  • 基金资助:
    四川省应用基础研究项目;油气藏地质及开发工程国家重点实验室(西南石油大学)开放基金项目

Exergy analysis of synthesis of methanol from methane based on closed loop carbon dioxide reforming process

Ling SUN, Lin ZHU*, Yangdong HE   

  1. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2019-09-04 Revised:2019-11-15 Online:2020-07-22 Published:2020-07-21
  • Contact: Lin ZHU

摘要: 二氧化碳重整制甲醇过程对碳源高效利用和环境保护具有重要意义,可作为替代传统高能耗、高排放水蒸气重整过程的途径。用Aspen Plus软件模拟链式循环二氧化碳重整的甲烷制甲醇过程。结果表明,该过程的?损失主要集中在化学过程,占总?损的76.47%,其中燃烧反应与重整反应分别占41.62%和27.69%,而甲醇合成反应与水汽变换反应分别占3.55%与3.61%。与传统水蒸气重整制甲醇过程相比,在原料甲烷输入量一定情况下,二氧化碳重整制甲醇系统的重整过程比水蒸气重整过程?损失减少21.44%,水蒸气消耗量减少77.02%,整体系统二氧化碳排放量降低了25.89%,甲醇的产量提高了12.03%。随着重整反应温度的提高,?效率和甲醇产量均出现先升高、后平稳的趋势,并在980℃达到最大值。此外,较低的重整反应压力有利于提高甲醇产量。

关键词: 二氧化碳, 甲烷, 重整, 甲醇, 火用分析

Abstract: The process of carbon dioxide reforming to methanol is of great significance for the efficient use of carbon sources and environmental protection, used as a way to replace the traditional high energy consumption and high emission steam reforming process. With aid of Aspen Plus, the process of methane to methanol in closed loop carbon dioxide reforming was simulated. The results showed that the exergy loss of this process mainly concentrated on the chemical process, accounting for 76.47% of the total exergy loss. The combustion reaction and reforming reactions accounted for 41.62% and 27.69%, respectively, while the methanol synthesis reaction and the water gas shift reaction accounted for 3.55% and 3.61%, respectively. Compared with the traditional steam reforming methanol process in the case of a certain amount of raw material methane input, the carbon dioxide reforming methanol system reduced in exergy loss of 21.44%, in water vapor consumption of 77.02%, in overall system carbon dioxide emissions of 25.89%, and increased in methanol production of 12.03%. In addition, in order to further improve the efficiency of the carbon dioxide reforming methanol process, the impacts of temperature and pressure in the reforming process were analyzed, showing that the exergy efficiency and methanol yield of the system increased first with the increase of reforming reaction temperature, then stabilized, and the reached maximum at 980℃. And the lower reforming reaction pressure was, the more beneficial improved methanol production.

Key words: Carbon dioxide, methanel, reforming, methanol, exergy analysis