化工进展 ›› 2024, Vol. 43 ›› Issue (S1): 604-614.DOI: 10.16085/j.issn.1000-6613.2023-1474

• 资源与环境化工 • 上一篇    下一篇

Na2SO4电解制备NaOH捕集CO2

王博葳1(), 郑明朕1, 王乐萌1,2, 付东1,2, 王珊3, 朱生俊3, 赵昆1,2, 张盼1,2()   

  1. 1.华北电力大学(保定)环境科学与工程系,河北 保定 071003
    2.华北电力大学(保定)河北省燃煤电站烟气多污染物协同控制重点实验室,河北 保定 071003
    3.河北中科朗博环保科技有限公司,河北 石家庄 050018
  • 收稿日期:2023-08-23 修回日期:2024-02-28 出版日期:2024-11-20 发布日期:2024-12-06
  • 通讯作者: 张盼
  • 作者简介:王博葳(1999—),男,硕士研究生,研究方向为CO2捕集。E-mail:2973538974@qq.com
  • 基金资助:
    国家自然科学基金青年项目(52106009);河北省自然科学基金面上项目(E2021502024)

Preparation of NaOH for CO2 capture by electrolysis of Na2SO4

WANG Bowei1(), ZHENG Mingzhen1, WANG Lemeng1,2, FU Dong1,2, WANG Shan3, ZHU Shengjun3, ZHAO Kun1,2, ZHANG Pan1,2()   

  1. 1.Department of Environmental Science and Engineering, North China Electric Power University (Baoding), Baoding 071003, Hebei, China
    2.Key Laboratory of Coal-Fired Flue Gas Multi-pollutant Synergistic Control, North China Electric Power University (Baoding), Baoding 071003, Hebei, China
    3.Hebei Zhongke Langbo Environmental Protection Technology Co. , Ltd. , Shijiazhuang 050018, Hebei, China
  • Received:2023-08-23 Revised:2024-02-28 Online:2024-11-20 Published:2024-12-06
  • Contact: ZHANG Pan

摘要:

化学吸收法作为当前烟气碳捕集的重要手段已经广泛应用于各项示范工程中,其中钠碱法相较于当前主流吸收法具有低挥发、低毒性、低成本的优点。为了应对烟气中的酸性气体CO2以及干法脱硫脱除SO2后的含Na2SO4废水,利用双极膜电渗析法将电解Na2SO4与NaOH捕集CO2相结合,对不同条件下的电解效率和NaOH产率进行了分析,探究了在吸收平衡实验和喷淋塔中NaOH捕集CO2的效果,并比较了不同条件下的NaHCO3结晶量。结果表明,双极膜电渗析可以使Na2SO4有效电解为NaOH。CO2吸收平衡实验表明电解产物NaOH相对于Na2CO3具有更高的CO2吸收量和吸收速率,且乙醇胺(MEA)能进一步加强NaOH对CO2的吸收效果。当温度为50℃和液气比为167时,喷淋塔中CO2捕集效果最佳,吸收量达到CO2理论吸收值的98.67%,可获取结晶细小的棒状NaHCO3粉末,最大的结晶量可达22.447g。

关键词: 电渗析, 二氧化碳捕集, 吸收, 结晶, 喷淋塔

Abstract:

As an important means of carbon capture in flue gas, chemical absorption has been widely used in various demonstration projects. Among them, the sodium alkali method has the advantages of low volatility, low toxicity and low cost compared to the current mainstream absorption method. In this paper, to deal with the acidic gas CO2 in flue gas and the desulfurization wastewater containing Na2SO4 after dry desulfurization and SO2 removal, electrolytic Na2SO4 and CO2 capture by NaOH aqueous solution were coupled to analyze the electrolytic efficiency and NaOH yield under different conditions, explore the absorption effect of CO2 capture in absorption equilibrium experiment and spray tower, and compare the crystallization amount of NaHCO3 under different conditions. The electrolysis efficiency and NaOH yield under various conditions were analyzed. The CO2 absorption equilibrium experiment showed that the electrolytic product NaOH had a higher absorption amount and absorption rate than Na2CO3, and MEA could further enhance the CO2 absorption effect of NaOH. When the temperature was 50℃ and the liquid-gas ratio was 167, the CO2 capture effect in the spray tower was optimal with an absorption rate of 98.67%. Fine crystalline rod-shaped NaHCO3 powder can be obtained and the maximum crystallization amount can reach 22.447g.

Key words: electrodialysis, carbon dioxide capture, absorption, crystallization, spray tower

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