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Dual Alkali Solvent System for CO_2 Capture from Flue Gas

机译:从烟气中捕集CO_2的双碱溶剂系统

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摘要

A novel two-aqueous-phase CO_2 capture system, namely the dual alkali solvent (DAS) system, has been developed Unlike traditional solvent-based CO_2 capture systems in which the same solvent is used for both COz absorption and stripping, the solvent of the DAS system consists of two aqueous phases. The upper phase, which contains an organic alkali l-(2-hydroxyethyl) piperazine (HEP), is used for CO_2 absorption. The lower phase, which consists of a mixture of K2C03/ KHCO3 aqueous solution and KHCO3 precipitate, is used for CO_2 stripping. Only a certain kind of amine (such as HEP) is able to ensure the phase separation, satisfactory absorption efficiency, effective CO_2 transfer from the upper phase to the lower phase, and regeneration of the upper phase. In the meantime, due to the presence of K2C03/KHC03 in the lower phase, HEP in the upper phase is capable of being regenerated from its sulfite/sulfate heat stable salt, which enables the simultaneous absorption of CO_2 and S02/S03 from the Hue gas. Preliminary experiments and simulations indicate that the implementation of the DAS system can lead to 24.0% stripping energy savings compared to the Econamine process, without significantly lowering the CO_2 absorption efficiency (~90%).
机译:与传统的基于溶剂的CO_2捕集系统不同,在传统的基于溶剂的CO_2捕集系统中,相同的溶剂用于COz的吸收和汽提,传统的基于溶剂的CO_2捕集系统已被开发出来。 DAS系统由两个水相组成。上层相包含有机碱1-(2-羟乙基)哌嗪(HEP),用于吸收CO_2。由K2CO3 / KHCO3水溶液和KHCO3沉淀物的混合物组成的下层相用于CO_2汽提。只有某种胺(例如HEP)才能确保相分离,令人满意的吸收效率,有效的CO_2从上层相到下层相的转移以及上层相的再生。同时,由于在下部相中存在K2CO3 / KHC03,上部相中的HEP能够从其亚硫酸盐/硫酸盐热稳定盐中再生,从而能够从色相中同时吸收CO_2和SO2 / SO3加油站。初步实验和模拟表明,与Econamine工艺相比,DAS系统的实施可节省24.0%的汽提能量,而不会显着降低CO_2的吸收效率(〜90%)。

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  • 来源
    《Environmental Science & Technology》 |2017年第15期|8824-8831|共8页
  • 作者单位

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

    Environmental Energy Technology Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States TH.P.W., C.-Y.L., T.-L.H., S.-H.L.: On leave from the Department of Environmental Engineering, National Cheng-Kung University, Tainan 70101, Taiwan.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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