洁净煤技术

2020, v.26;No.129(05) 147-152

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2种离子液体对水泥窑窑尾烟气CO_2吸收特性试验研究
Experimental investigation on the absorption characteristics of two ionic liquids for CO_2 in cement kiln tail gas

闫全英;吕一帆;潘利生;魏小林;李冰;
YAN Quanying;LYU Yifan;PAN Lisheng;WEI Xiaolin;LI Bing;School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture;State Key Laboratory of High-temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences;

摘要(Abstract):

随着全球气候变暖趋势不断持续,工业领域的碳减排迫在眉睫。水泥熟料生产工艺中,水泥窑产生大量富含CO_2的烟气,浓度高达30%以上。因此,水泥窑窑尾烟气的碳捕集将对工业领域的碳减排具有重要作用。以2种离子液体[M_4Gu]Ac(四甲基胍醋酸盐)、[TMG][Lac](四甲基胍乳酸盐)为研究对象,分别考察了其在30、50、70℃下对纯CO_2和水泥窑窑尾模拟烟气中CO_2的吸收特性。结果表明,离子液体对纯CO_2和水泥窑窑尾模拟烟气中CO_2的最大吸收量皆随温度的升高而大幅降低,70℃时2种离子液体对纯CO_2的最大吸收量小于其在30℃时最大吸收量的50%;[M_4Gu]Ac、[TMG][Lac]对水泥窑窑尾模拟烟气中CO_2的吸收效果明显劣于对纯CO_2的吸收效果,最大吸收量仅为相同工况下2种离子液体对纯CO_2最大吸收量的22.3%和20.9%。70℃下对离子液体进行5次吸收和再生循环试验结果表明,2种离子液体的吸收性能基本稳定,再生次数对其CO_2吸收能力影响不大。
With the continuous global warming trend,reducing carbon emission from industry is imminent. In the production process of cement clinker,a large amount of tail gas in which consist over 30% CO_2 is emitted from the cement kiln. Therefore,it will contribute greatly to capture CO_2 from tail gas of cement kilns for carbon emission reduction of industrial field. Taking two ionic liquids,[M_4Gu]Ac( tetramethylguanidine acetate) and [TMG][Lac]( tetramethylguanidine lactate),as research objects,the absorption characteristics of pure CO_2 and CO_2 in simulated tail gas of cement kiln tail gas at 30 °C,50 °C and 70 °C were investigated. The results show that the maximum absorption capacity for pure CO_2 and CO_2 in simulated flue gas from cement kiln tail by ionic liquids decreases greatly with the increase of working temperature. The maximum absorption capacity of the two ionic liquids at 70 ℃ is 50% less than the maximum absorption capacity of the two ionic liquids at 30 ℃ . The absorption effect of [M_4Gu]Ac and [TMG][Lac]on CO_2 in simulated tail gas of cement kiln is obviously worse than that of pure CO_2. The maximum absorption of CO_2 by the two ionic liquids is only 22.3% and 20.9% of that of pure CO_2 under the same conditions. The five times absorption and regeneration cycle experiments of two kinds of ionic liquids were carried out at 70℃ . The results show that the absorption properties of the two ionic liquids are basically stable in five experiments,and the regeneration times have little effect on the CO_2 absorption capacity of the two ionic liquids.

关键词(KeyWords): 离子液体;CO_2吸收;水泥窑窑尾烟气;碳捕集
ionic liquid;CO_2 absorption;tail gas of cement kiln;carbon capture

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2016YFB0601504)

作者(Author): 闫全英;吕一帆;潘利生;魏小林;李冰;
YAN Quanying;LYU Yifan;PAN Lisheng;WEI Xiaolin;LI Bing;School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture;State Key Laboratory of High-temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences;

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DOI: 10.13226/j.issn.1006-6772.IF20080612

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