化工进展 ›› 2022, Vol. 41 ›› Issue (11): 6167-6175.DOI: 10.16085/j.issn.1000-6613.2022-0063

• 资源与环境化工 • 上一篇    下一篇

低温甲醇洗碳捕集改进与优化

张陆(), 杨声()   

  1. 中南大学能源科学与工程学院,湖南 长沙 410083
  • 收稿日期:2022-01-09 修回日期:2022-04-02 出版日期:2022-11-25 发布日期:2022-11-28
  • 通讯作者: 杨声
  • 作者简介:张陆(1996—),男,硕士研究生,研究方向为化工系统工程。E-mail:zhang-lu@csu.edu.cn
  • 基金资助:
    中南大学中央高校基本科研业务费专项(1053320212585);国家自然科学基金(22008265)

Improvement and optimization of carbon capture via Rectisol

ZHANG Lu(), YANG Sheng()   

  1. School of Energy Science and Engineering, Central South University, Changsha 410083, Hunan, China
  • Received:2022-01-09 Revised:2022-04-02 Online:2022-11-25 Published:2022-11-28
  • Contact: YANG Sheng

摘要:

减少CO2排放对环境保护尤为重要。传统低温甲醇洗工艺中大量被贫甲醇吸收的CO2由于被N2稀释而直接作为尾气排放进大气中。为探究工艺改进空间,本研究基于Aspen Plus对一传统低温甲醇洗工艺进行模拟,物性方法选用CPA(Cubic-Plus-Association)模型并对该模型的二元交互系数进行回归修正,后与实际数据进行对比确保模型的准确性。对于工艺改进,首先在传统低温甲醇洗工艺的基础上采用四级增压热闪蒸和降压闪蒸相结合的方式进行一次改进以用于CO2捕集,并对相关参数进行优化以进一步降低系统公用工程消耗。结果显示,虽然一次改进工艺的CO2产量是传统工艺的3.3倍,但系统能量消耗增加了2.12%,系统㶲消耗增加了17.81%。接着,在一次改进工艺的基础上采用“半贫液+透平回收”相结合技术进一步进行节能改进,二次改进工艺的CO2产量不仅与一次改进工艺相当,系统能量消耗和系统㶲消耗相比于传统低温甲醇洗工艺也分别降低了17.16%和5.85%。

关键词: 甲醇洗工艺, 模拟, CPA模型, CO2捕集, 节能

Abstract:

Reducing CO2 emissions is particularly important for environmental protection. In conventional Rectisol process, a large amount of CO2, absorbed by poor methanol, is diluted by N2 and directly discharged into the atmosphere as tail gas. In order to explore the space for process improvement, a conventional Rectisol process was simulated based on Aspen Plus. The physical property method selected the CPA (Cubic-Plus-Association) model, and the binary interaction coefficient of the model was corrected, and then compared with the practical data to ensure the accuracy of the model. For process improvement, firstly, the first improvement, based on the conventional Rectisol process, was proposed by combining four-stage pressurized hot flash and depressurized flash for CO2 capture, and the related parameters were optimized to further reduce the system utilities consumption. The result showed that although the CO2 production of the first improvement process was 3.3 times that of the conventional process, the system energy consumption increased by 2.12%, and the system exergy consumption increased by 17.81%. Next, further energy saving improvement was made on the basis of the first improvement process by adopting the combined technology of "semi-lean solution + turbine recovery". The CO2 production of the second improvement process was not only equivalent to the first improvement process, but also the system energy consumption and exergy consumption reduce by 17.16% and 5.85% respectively compared with the conventional Rectisol process.

Key words: Rectisol process, simulated, CPA model, CO2 capture, energy saving

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