可再生型有机胺脱除SO_2的实验研究

Experimental Study on SO_2 Removal with Renewable Organic Amines

采用静态鼓泡吸收法,对4种有机胺吸收模拟烟气中SO_2的脱硫性能进行了实验研究,并采用油浴加热装置,对4种有机胺的解吸性能进行了研究.结果表明:有机胺溶液脱硫效率随时间变化逐渐降低,不同有机胺吸收性能排序依次为哌嗪>乙二胺>DEA>MDEA;在相同解吸温度下,解吸率随反应进行逐渐升高;不同有机胺解吸性能优劣排序为MDEA>乙二胺>DEA>哌嗪;通过热力学参数计算得到MDEA吸收SO_2的吉布斯自由能比石灰石吸收SO_2的吉布斯自由能更小,说明MDEA吸收SO_2的能力比石灰石更好,理论上是一种更合适的脱硫剂.

Absorption experiments were performed in a bubbling system to study the effects of four differ- ent organic amines on the wet flue gas desulfurization, while desorption experiments were conducted in an oil-bath heating device to analyze the desorption effects of the four organic amines. Results show that the desulfurization rate of above organic amines declines with the variation of time following the order below： piperazine〉ethylenediamine〉DEA〉MDEA; whereas their desorption rate at same desorption tempera tures increases with the variation of time, showing the desorption performance from strong to weak as fol- lows： MDEA〉ethylenediamine〉DEA〉piperazine. Through calculation with thermodynamic parameters, it is found that the Gibbs free energy of MDEA for absorption of SO2 is less than that of limestone, indica- ting that MDEA is a better desulfurizing agent, with stronger capability in SO2 absorption than limestone.