CIESC Journal ›› 2022, Vol. 73 ›› Issue (1): 322-331.DOI: 10.11949/0438-1157.20211441

• Separation engineering • Previous Articles     Next Articles

Process simulation and energy consumption analysis of CO2/N2 pilot-scale separation using ZIF-8 slurry

Zixuan HUANG1(),Huan CHEN1(),Hai LI1,2(),Minglong WANG1,Guangjin CHEN1,Bei LIU1   

  1. 1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
    2.Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2021-10-09 Revised:2021-11-27 Online:2022-01-18 Published:2022-01-05
  • Contact: Hai LI

ZIF-8浆液中试分离CO2/N2过程模拟及能耗分析

黄子轩1(),陈欢1(),李海1,2(),王明龙1,陈光进1,刘蓓1   

  1. 1.中国石油大学(北京)重质油国家重点实验室,北京 102249
    2.中国科学院过程工程研究所,绿色过程与工程重点实验室,北京 100190
  • 通讯作者: 李海
  • 作者简介:黄子轩(1996—),男,博士研究生,913215038@qq.com|陈欢(1997—),男,硕士研究生,ch13677979219@163.com
  • 基金资助:
    国家自然科学基金项目(21776301)

Abstract:

ZIF-8/2-methylimidazole-ethylene glycol-water slurry was used for separating CO2 from CO2/N2 in a pilot-scale packed tower. In order to evaluate the tower efficiency and energy consumption of the packed tower in the CO2 capture process, firstly, the binary interaction parameters kCO2 of CO2 and ZIF-8 slurry were fitted by Peng-Robinson equation of state. Then the binary interaction parameters were related to Aspen Plus to simulate the multi-stage absorption process of CO2/N2. The calculation results show that in the pilot-scale packed tower, with only 5 theoretical plates, ZIF-8 slurry could reduce the CO2 concentration from 20%(mol) to less than 2%(mol), indicating the tray efficiency of the packed tower is 25%. About the energy consumption for the separation of CO2/N2 in the pilot plant, the results indicate that when desorption conditions were set at 333 K, 0.8 MPa, and 200 L/h, the CO2 capture equivalent work can be as low as 0.474 GJ/t CO2. When ZIF-8 slurry and MEA (30%(mass)) aqueous solution were used for CO2 capture under the same conditions, the CO2 capture equivalent work are 0.507 GJ/t CO2 and 0.957 GJ/t CO2, respectively. The CO2 capture equivalent work of ZIF-8 slurry is only 53% of that of MEA aqueous solution.

Key words: ZIF-8, CO2 capture, packed tower, process simulation, energy consumption analysis

摘要:

ZIF-8/2-甲基咪唑-乙二醇-水浆液(ZIF-8浆液)可以高效低耗能地分离CO2。为了进一步评估ZIF-8浆液在填料塔中分离CO2的塔效率及能耗,使用Peng-Robinson(PR)状态方程,求出CO2和ZIF-8浆液的二元交互作用参数(kCO2),将二元交互作用参数和Aspen Plus软件进行关联,对CO2/N2多级吸收分离进行过程模拟。计算结果表明在中试填料塔中,ZIF-8浆液仅需要5块理论塔板即可将CO2浓度由20%(mol)降低至2%(mol)以下,填料塔的塔板效率为25%。对中试分离CO2/N2进行能耗计算,结果表明当解吸条件为解吸温度333 K,解吸压力0.8 MPa和空气吹扫流量200 L/h时,CO2捕集等效功最低可至0.474 GJ/t CO2。在同样条件下使用ZIF-8浆液和MEA(30%(mass))水溶液进行碳捕集时,CO2捕集等效功分别为0.507 GJ/t CO2和0.957 GJ/t CO2,ZIF-8浆液的CO2捕集等效功仅为MEA水溶液的53%。

关键词: ZIF-8, 二氧化碳捕集, 填料塔, 过程模拟, 能耗分析

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