【作者】 孟令嫒；

【导师】 薛娟琴；

【作者基本信息】 西安建筑科技大学 ， 冶金物理化学， 2008， 硕士

【摘要】 再生胺法烟气脱硫由于吸收剂可重复使用,系统不产生废弃物,所回收的二氧化硫可经济地加以利用,因而具有广泛的应用前景。确定溶液中胺的形态是目前的技术难题,本文选择了三种聚胺化合物(乙二胺、二乙三胺、三乙四胺)水溶液作为吸收剂,在对聚胺溶液性质研究的基础上,探讨了聚胺溶液吸收和解吸二氧化硫的原理,并通过实验系统研究了多种因素对二氧化硫吸收和解吸过程的影响规律。通过对聚胺溶液性质的研究,明确了在吸收和解吸过程中起作用的是质子化胺。实验结果表明,当pH=6～8时聚胺溶液的吸收容量最大;综合考虑到解吸过程,吸收液较合理的初始pH值应在7左右;吸收液溶液配比为胺/水的体积比=5/200;温度为20～50℃,溶液吸收效果最佳。表面活性剂可改变溶液的性质,对二氧化硫解吸效果具有一定的促进作用,不同的添加剂影响效果也不同,在所研究的表面活性剂中十二烷基硫酸钠对二氧化硫解吸效果最好。同时通过实验研究了两种聚胺化合物-水多元体系的各种因素对二氧化硫吸收和解吸过程的影响。实验结果表明:在总胺量一定的条件下,二乙三胺/三乙四胺体积比为4/1时,吸收和解吸效果较好。更多还原

【Abstract】 Flue gas desulfurization (FGD) by using regenerative amine solution have some merits such as absorbing agent reusaging、not giving off waste material in system、economizing reclaimed sulfur dioxide, so it has widely practical perspective. Determining the shape of amine in aqueous solution is recently difficult problem. Three kinds of polyamine compounds are chosen to be the absorbing agent. On the base of studing on the property of polyamine compounds, the mechanism of polyamine compounds absorption of sulfur dioxide from polyamine compounds is investigated and the factors influencing absorption and desorption of sulfur dioxide are discussed by experiments.From the study of property of polyamine compounds, the protonated amines play the dominant role in the buffer action during the process of absorption and desorption sulfur dioxide. The experiment results are showed that the buffer capacity of polyamine compounds in aqueous solution is the strongest when pH=6～8. the optimal pH value of polyamine compounds in aqueous solution should be about 7 by jointly considering the process of absorption and desorption; the concentration of polyamine compounds in aqueous solution is 5/200 (ratio by volume of amine and water); the temperature is 20～50℃. Adding surfactants into the polyamine compounds in aqueous solution can lower the viscosity and surface tension of solution, and accelerate the desorption efficiency of sulfur dioxide. Dodecyl sodium sulfate is the best surfactants in this study.Simultaneously, the influence of absorption and desorption of sulfur dioxide by using two kinds of amines and water multivariate system is studied. Results show that the Diethylenetriamine/Triethylenetetramine solution (ratio by volume is 4/1) is the best mixture of absorbing medium if the total amine concentration is definite value.更多还原