烟道气固碳脱硫与海水脱钙的耦合研究  

On the coupling of flue gas desulfurization and carbon sequestration with sea water decalcification

作　　者：赵颖颖 冯娜 吴梦凡 李丹 马倩薇 袁俊生 

机构地区：[1]河北工业大学海洋科学与工程学院,天津300130

出　　处：《河北工业大学学报》2017年第5期45-50,共6页Journal of Hebei University of Technology

基　　金：中国博士后科学基金(2017M611142);国家科技支撑计划(2015BAB09B00);天津市自然科学基金(14JCYBJC20700);河北省科技支撑计划(17273101D)

摘　　要：利用海水和碱源的碱性与烟道气中二氧化碳和二氧化硫的酸性,实现了海水脱钙和烟道气固碳脱硫两者的耦合.加入碱源氧化镁,向海水中通入模拟烟道气,控制每次实验的通气时间,每次实验结束后研究溶液中Ca^(2+)、Mg^(2+)、CO_3^(2-)、HCO_3^-等离子的变化趋势,并结合固相XRD图谱分析推测实验过程中的反应机理.结果表明:随着通气时间的增加,Ca^(2+)浓度逐渐减小,脱钙率高达87.6%,固碳率先增加后降低,最高可达48.2%,通过Ca^(2+)、Mg^(2+)、CO_3^(2-)、HCO_3^-离子的变化趋势并结合XRD峰图可推测出,Ca^(2+)先与CO_2反应生成CaCO_3,而MgO与水结合生成Mg(OH)_2,随CO_2的通入,Mg(OH)_2不断提供OH^-促进二氧化碳的电离.但随着CO_2继续增多,少量CaCO_3会转换为Ca(HCO_3)_2而溶解,使脱钙率下降.According to the characteristics of sea water and flue gas, the coupling of flue gas desulfurization and carbon sequestration with seawater decalcification was studied. Not only the concentration changes of Ca^(2+)、Mg^(2+)、CO_3^(2-)、HCO_3^- were studied, but also the mechanism of the experimental process was speculated with XRD spectrum. Simulated flue gas was added into sea water, varying from 1 min to 10 min, after adding new alkali source——MgO. It is found that the concentration of Ca^(2+)gradually decreases while carbon fixation rate increases first and then decreases. Combined with the concentration changes of Ca^(2+)、Mg^(2+)、CO_3^(2-)、HCO_3^- and XRD spectrum, it is speculated that firstly the reaction between Ca^(2+)and CO_2 produces CaCO_3 while MgO reacts with the water to give Mg(OH)2 which continually provides OH-to promote the ionization of carbon dioxide, and then a little CaCO_3 turns into Ca(HCO_3)_2 with continuous influx of CO_2.

关 键 词：海水脱钙 烟道气 脱硫 固碳 新型碱源 

分 类 号：TQ95[化学工程]