二氧化硫在脱钙后海水体系中的溶解平衡  

Solubility equilibrium of SO_2 in the decalcified seawater

作　　者：谢英惠[1] 曹海楠[1] 赵颖颖[1] 袁俊生[1] 

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：《化工进展》2016年第4期1012-1016,共5页Chemical Industry and Engineering Progress

基　　金：国家"十二五"科技支撑计划(2015BAB09B00);国家自然科学基金(21306037);天津市自然科学基金(13JCQNJC05600;14JCYBJC20700);河北省高层次人才资助项目(C2013003041)

摘　　要：CO2脱钙后海水与标准海水相比,具有更少的Ca2＋和更多的HCO3-,理论上HCO3-可与SO2溶于水后产生的亚硫酸氢根反应,促进SO2的溶解。为此本文以N2为惰性载气,研究了1atm下,温度变化范围为34.0～63.9℃,SO2在标准海水、Na HCO3含量增多的海水以及钙离子减少的海水中的溶解性能,以期实现海水CO2脱钙与烟道气脱硫的耦合。结果表明SO2在标准海水中的溶解度随着温度的升高显著降低,且SO2溶解度的数值与温度呈近似线性关系;海水中HCO3-含量的增加会提高SO2在此水体系中的溶解度;而海水中钙离子的减少对SO2在此水体系中的溶解性能并无显著影响。因此与标准海水体系相比,CO2脱钙后海水体系对SO2具有更好的溶解性能,为利用CO2脱钙后海水进行烟气脱硫,从而实现海水脱钙与烟气脱硫的耦合提供了理论支持及基础数据。Compared with normal seawater,the content of HCO3- in the seawater of calcium removed using CO2 is higher. Because HCO3- can react with hydrogen sulfite produced by sulfur dioxide dissolving in water,which in return helps increase the solubility of sulfur dioxide. Therefore,the effect of the amount of HCO3- and Ca2＋ on the solubility of sulfur dioxide in seawater was studied at temperatures of 34.0—63.9℃ with N2 as inert carrier gas and under 1atm. The results showed that the solubility of SO2 in standard seawater significantly reduced linearly with increasing temperature. The increase of HCO3- ion concentration in demineralized seawater will enhance the solubility of SO2 in water. But there is no significant effect of the reduction of Ca2＋ ion concentration on the SO2 solubility within the studied scope. It can be concluded that sulfur dioxide shows a better dissolution performance in the seawater decalcified by CO2 than in the standard seawater,and this study provides a theoretical support to the coupling of flue gas desulfurization and seawater decalcification using CO2.

关 键 词：脱钙海水 溶解性能 二氧化硫 

分 类 号：TQ132.2[化学工程—无机化工]