Chemical Industry and Engineering Progress ›› 2022, Vol. 41 ›› Issue (12): 6698-6710.DOI: 10.16085/j.issn.1000-6613.2022-0246

• Resources and environmental engineering • Previous Articles     Next Articles

Adsorption characteristics of CO2/H2O with low humidity

REN Kexin(), LU Junhui(), WANG Suilin, TANG Jinjing   

  1. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
  • Received:2022-02-16 Revised:2022-04-12 Online:2022-12-29 Published:2022-12-20
  • Contact: LU Junhui

低湿CO2/H2O混合气体吸附特性实验

任可欣(), 鲁军辉(), 王随林, 唐进京   

  1. 北京建筑大学环境与能源工程学院,北京 100044
  • 通讯作者: 鲁军辉
  • 作者简介:任可欣(1997—),女,硕士研究生,研究方向为电厂烟气碳捕集。E-mail:2108590020155@stu.bucea.edu.cn
  • 基金资助:
    国家重点研究计划(2016YFB0600105);北京学者计划(2015 022);北京市博士后工作经费项目(2021-ZZ-112);北京建筑大学市属高校基本科研业务专项资金项目(X21016)

Abstract:

Carbon capture, utilization and storage is an essential way to achieve the goal of carbon peak and neutrality, the gases exhaust from power industry and coal supercritical water gasification systems after condenser of carbon capture are mainly CO2/H2O with 1%—5% H2O, which needs to separate using by adsorption. To purify and reutilize the low-moisture CO2/H2O, the adsorption breakthrough curve, temperature profiles, adsorption capacity of binary CO2/H2O at different temperature (303K, 313K) and H2O mole fraction (0.7%—3.0%) were studied experimentally for four adsorbents of activated carbon, activated alumina, zeolites 3A and 13X. The separation factor and isosteric heat of binary CO2/H2O were also analyzed. Results show that as adsorption time increases, the bed temperature and the concentration of each component present the same trend. As the inlet temperature increases, the saturation time of H2O decreases. As the mole fraction of H2O increases, the adsorption of CO2 was inhibited due to competitive adsorption, and the saturated time of H2O in activated carbon and activated alumina increases, but that of H2O in zeolite 3A and 13X decreased. The adsorption amounts of H2O increased with the increase of H2O concentration, while the isosteric heat decreased with the adsorption amounts, which presented the opposite for CO2. Zeolite 3A had the smallest CO2 adsorption amounts and the largest CO2/H2O separation factor. When H2O mole fraction was less than 1%, the separation factor of zeolite 13X, which had the largest CO2 adsorption amounts, was greater than that of activated alumina. Therefore, the zeolite 3A and 13X were suitable for the separation of CO2/H2O with low moisture.

Key words: carbon capture, CO2/H2O, adsorption, activated carbon, activated alumina, zeolite 3A and 13X, selectivity

摘要:

CO2捕集、封存及利用是实现“双碳”目标的重要途径,为将碳捕集后的低湿CO2/H2O进行CO2提纯和资源化利用,采用动态吸附实验研究了不同温度(303K、313K)、H2O含量(0.7%~3.0%)的CO2/H2O在活性炭、活性氧化铝、分子筛3A和13X四种吸附剂上的动态吸附穿透曲线、吸附床温度分布、吸附量,分析了CO2/H2O分离系数和吸附热。结果表明,在CO2/H2O动态吸附过程中,吸附床温度与各组分浓度随时间变化趋势相同。H2O饱和时间随进气温度升高而缩短;H2O含量增加,抑制CO2吸附;活性炭和氧化铝中H2O的饱和时间随H2O含量增加而增长,但分子筛3A和13X饱和时间缩短。H2O吸附量随H2O含量增加而增加,吸附热随吸附量增加而减小,CO2则相反。分子筛3A对CO2吸附量最小且CO2/H2O分离系数最大。H2O含量小于1%时,CO2吸附量最大的分子筛13X分离系数大于活性氧化铝,分子筛3A和13X适合分离低湿CO2/H2O。

关键词: 碳捕集, CO2/H2O, 吸附, 活性炭, 活性氧化铝, 分子筛3A和13X, 选择性

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