阳极液对钠碱膜电解再生的影响  

Effects of Anolyte on Membrane Electrolysis Regeneration of Sodium Alkali Solution

作　　者：刘丽梅[1] 张书廷[1] 吕学斌[1] 刘勇[1] 孙路长[1] 支苏丽[1] 谢建治[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《天津大学学报》2012年第6期511-515,共5页Journal of Tianjin University(Science and Technology)

基　　金：日本国家基金资助项目(NEDO 0706001)

摘　　要：湿法脱硫以其高效成熟而得到广泛应用,但存在着脱硫废液处理和吸收富液再生等问题,为此,将膜技术应用于湿法脱硫吸收富液再生过程中,研究不同阳极液对膜电解过程各个参数的影响规律.在自制的二室A201阴极膜电解装置中,分别采用硫酸溶液和水作为阳极液,研究不同阳极液对钠碱吸收液再生过程中电流密度、硫酸回收率、吸收富液再生效果和再生电耗的影响规律.实验结果表明,阳极液的类型和浓度对膜电解再生过程中各个参数具有较大影响.当阳极液为稀硫酸时有利于电流的通过,阳极室初始稀硫酸浓度越大则硫酸回收效果越好,阴极钠碱液的再生电耗效率越高;当阳极液为水时,溶液导电能力较弱,但无论从电流密度还是电耗对再生效率的影响来看,水溶液相对于稀硫酸更利于阴极液的低能耗和高效率再生,其较佳的膜电解电耗约为690,kW.h/t(NaHSO3).Wet sodium alkali solution flue gas desulfurization technology has been widely applied in coal-fired power plants all over the world due to its high efficiency and reliability, but the problems of liquid waste disposal and sulfur dioxide-enriched absorption solution regeneration come along. This paper reports the membrane technique applied in the sulfur dioxide-enriched absorption solution regeneration process. The effects of anolyte such as dilute sulphuric acid and water solution on the regeneration process of sodium alkali solution have been systematically investigated in this paper, using a two-chamber electrolytic cell with an anion exchange membrane of A201. The results indicate that anolyte＇s properties and concentration have an important influence on the membrane electrolysis process. To dilute sulphuric acid anolyte, currents will easily occur due to the better conductivity of sulphuric acid. Furthermore, the higher the initial concentration of sulphuric acid is, the better the efficiency of the recycling of sulphuric acid in an- ode chamber is and the higher the energy efficiency in the recycle of sodium alkali solution is. On the other hand, based on the effects of current density or energy consumption on the regeneration efficiency of sodium alkali solution, water solution anolyte will be better in terms of saving energy and improving the regeneration efficiency, compared with dilute sulphuric acid anolyte. The optimum energy consumption for membrane electrolysis is 690 kW·h/t （NaHSO3） when anolyte is water solution.

关 键 词：湿法脱硫 膜电解 吸收富液再生 阳极液 电耗 

分 类 号：X7[环境科学与工程—环境工程]