Na_(2)SO_(4)电解制备NaOH捕集CO_(2)  

Preparation of NaOH for CO_(2)capture by electrolysis of Na_(2)SO_(4)

作　　者：王博葳 郑明朕 王乐萌 付东 王珊 朱生俊 赵昆 张盼 WANG Bowei;ZHENG Mingzhen;WANG Lemeng;FU Dong;WANG Shan;ZHU Shengjun;ZHAO Kun;ZHANG Pan(Department of Environmental Science and Engineering,North China Electric Power University(Baoding),Baoding 071003,Hebei,China;Key Laboratory of Coal-Fired Flue Gas Multi-pollutant Synergistic Control,North China Electric Power University(Baoding),Baoding 071003,Hebei,China;Hebei Zhongke Langbo Environmental Protection Technology Co.,Ltd.,Shijiazhuang 050018,Hebei,China)

机构地区：[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

出　　处：《化工进展》2024年第S01期604-614,共11页Chemical Industry and Engineering Progress

基　　金：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)。

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CO_(2)以及干法脱硫脱除SO_(2)后的含Na_(2)SO_(4)废水,利用双极膜电渗析法将电解Na_(2)SO_(4)与NaOH捕集CO_(2)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CO_(2)的效果,并比较了不同条件下的NaHCO_(3)结晶量。结果表明,双极膜电渗析可以使Na_(2)SO_(4)有效电解为NaOH。CO_(2)吸收平衡实验表明电解产物NaOH相对于Na_(2)CO_(3)具有更高的CO_(2)吸收量和吸收速率,且乙醇胺(MEA)能进一步加强NaOH对CO_(2)的吸收效果。当温度为50℃和液气比为167时,喷淋塔中CO_(2)捕集效果最佳,吸收量达到CO_(2)理论吸收值的98.67%,可获取结晶细小的棒状NaHCO_(3)粉末,最大的结晶量可达22.447g。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 CO_(2)in flue gas and the desulfurization wastewater containing Na_(2)SO_(4)after dry desulfurization and SO_(2)removal,electrolytic Na_(2)SO_(4)and CO_(2)capture by NaOH aqueous solution were coupled to analyze the electrolytic efficiency and NaOH yield under different conditions,explore the absorption effect of CO_(2)capture in absorption equilibrium experiment and spray tower,and compare the crystallization amount of NaHCO_(3)under different conditions.The electrolysis efficiency and NaOH yield under various conditions were analyzed.The CO_(2)absorption equilibrium experiment showed that the electrolytic product NaOH had a higher absorption amount and absorption rate than Na_(2)CO_(3),and MEA could further enhance the CO_(2)absorption effect of NaOH.When the temperature was 50℃and the liquidgas ratio was 167,the CO_(2)capture effect in the spray tower was optimal with an absorption rate of 98.67%.Fine crystalline rod-shaped NaHCO_(3)powder can be obtained and the maximum crystallization amount can reach 22.447g.

关 键 词：电渗析 二氧化碳捕集 吸收 结晶 喷淋塔 

分 类 号：TQ028.8[化学工程]