洁净煤技术

2021, v.27;No.132(02) 231-236

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纳米颗粒及分散剂对TETA溶液吸收CO_2的影响
Effect of nanoparticles and dispersant on CO_2 absorption by TETA solution

赵子淇;张忠孝;江砚池;贾萌川;穆艾伟;
ZHAO Ziqi;ZHANG Zhongxiao;JIANG Yanchi;JIA Mengchuan;MU Aiwei;School of Energy and Power Engineering,University of Shanghai for Science and Technology;School of Mechanical and Power Engineering,Shanghai Jiao Tong University;

摘要(Abstract):

为探究纳米颗粒对TETA溶液吸收CO_2的影响及分散剂对纳米流体吸收CO_2的促进效果,采用两步法配制了不同纳米颗粒种类及粒径、不同震荡时间、不同TETA浓度、不同纳米颗粒固含量和不同分散剂固含量及种类的纳米流体,搭建TETA溶液鼓泡吸收CO_2试验台,分别测试了不同工况下制备的纳米流体对CO_2的吸收情况,并与空白TETA溶液进行对比。结果表明,纳米流体的脱除率增强系数随着纳米颗粒质量分数的增加而先提升后降低,粒径较大的纳米颗粒具有较好的传质性能,大尺寸可以减少相对表面积和能量,使得纳米颗粒的表面和量子尺度效应减弱; CO_2吸收速率在初始阶段随着超声破碎时间的增加而提升,但超声破碎时间超过1 h,吸收速率减缓; TETA浓度及纳米颗粒固含量影响试验中,随着浓度及固含量上升,脱除率增强系数均呈现先升高后降低的趋势,存在最佳值。综上,在浓度1 mol/L的TETA中添加固含量0.1%、粒径60 nm的TiO_2,经超声震荡1 h后对CO_2的吸收效果最好,脱除率增强系数最高可达1.9。以TiO_2-TETA-H_2O纳米流体为基液在其中添加C-Na、SDBS、X-100等分散剂时,由于TiO_2颗粒表面带正电荷,分散剂类型对TiO_2-TETA-H_2O纳米流体稳定性的影响大致呈现以下趋势:阴离子型>非离子型>阳离子型,且以双电子层理论为依据,添加阴离子型分散剂C-Na的质量分数为0.1%时对阳离子型纳米流体TiO_2-TETA-H_2O的稳定效果最好。
In order to explore the influence of nanoparticles on the absorption of CO_2 by TETA solution and the promotion effect of dispersants on the absorption of CO_2 by nanofluids,two-step method was used to prepare nanofluids with different oscillation time,different TETA concentration,different particle size,different solid content and type of nanoparticles and dispersant.The TETA solution bubbling experiment platform was built to absorb CO_2. The absorption of CO_2 by nanofluids prepared under different working conditions was tested and compared with the blank solution.The experimental results show that,the enhancement coefficient of the removal rate of the nanofluids appears to increase first and then decrease with the increase of the mass fraction of the nanoparticles. The larger nanoparticles have better mass transfer performance,and the larger size can reduce the relative surface area and energy,the surface and quantum scale effects of nanoparticles are weakened.The CO_2 absorption rate increases with the increase of ultrasonic crushing time in the initial stage.However,the absorption rate slows down when the ultrasonic crushing time exceeds 1.0 h.During the experiment of TETA concentration and solid content of nanoparticles,the enhancement coefficient of removal rate increases first and then decreases with the increase of concentration and solid content.To sum up,1.0 mol/L TETA added with 60 nm TiO_2 with 0.1 wt.% has the most obvious promotion effect on CO_2 after 1.0 h ultrasonic shock.The removal rate enhancement coefficient can be up to 1.9. When dispersants of C-Na,SDBS and X-100 are added into TiO_2-TETA-H_2O nanofluids,the surface of TiO_2 particles is positively charged,so the influence of dispersants on the stability of TiO_2-TETA-H_2O nanofluids is generally as follows: anionic > non-ionic > cationic.When the mass fraction of anionic dispersant C-Na is 0.1%,the stability of cationic nanofluid TiO_2-TETA-H_2O is the best based on the theory of double electron layer.

关键词(KeyWords): 纳米粒子;TETA;CO_2捕集;鼓泡反应器;分散剂
nanoparticles;TETA;CO_2 capture;bubble column reactor;dispersant

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2016YFE0102500)

作者(Author): 赵子淇;张忠孝;江砚池;贾萌川;穆艾伟;
ZHAO Ziqi;ZHANG Zhongxiao;JIANG Yanchi;JIA Mengchuan;MU Aiwei;School of Energy and Power Engineering,University of Shanghai for Science and Technology;School of Mechanical and Power Engineering,Shanghai Jiao Tong University;

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DOI: 10.13226/j.issn.1006-6772.20110604

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