湿法脱硫浆液的真空蒸馏特性  

Distillation characteristics of wet flue gas desulfurization serosity

作　　者：洪永强[1] 陈桂芳[1] 毛岩鹏[1] 马春元[1] 

机构地区：[1]山东大学燃煤污染物减排国家工程实验室,山东省能源碳减排技术与资源化利用重点实验室,山东济南250061

出　　处：《化工进展》2016年第8期2561-2568,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(21307075)

摘　　要：湿法脱硫系统耗水量大,大量水分随净烟气流失,本文拟利用真空蒸馏的方式降低脱硫浆液温度,回收烟气中水分及潜热,达到节能、节水、提高脱硫效率等多重目的。实验利用旋转蒸发仪,进行了不同蒸发温差、冷却水温、蒸发压力下脱硫浆液的蒸馏特性、冷凝水品质及不凝气体释放特性的研究。研究结果表明:实验条件下,蒸发率在0.07~0.77之间,随着蒸发温差的升高呈线性升高趋势,随蒸发压力和冷却水温的升高呈下降趋势。冷凝水p H为8.14~8.33,随蒸发压力、蒸发温差及冷却水温的升高均未呈现明显规律,总体变化很小;氨氮浓度变化不大,在1.25~5.26mg/L之间,随着蒸发压力、蒸发温差的升高略有升高,随着冷却水温的升高变化不大;SⅣ浓度在6.13×10^(–4)~7.78×10^(–4)mol/L之间,随蒸发温差及冷却水温的升高而升高,随蒸发压力的增加略有降低;冷凝水中的总碱度主要以HCO_3~–的形式存在,在10.3~20.7mg/L之间,随着蒸发温差和蒸发压力的升高逐渐升高,随着冷却水温的升高不断降低;产生单位体积冷凝水释放的NH_3量随着蒸发压力和冷却水温的升高不断增加,随蒸发温差的增加明显降低。The wet flue gas desulfurization（WFGD） system occupies a heavy water consumption,and large amounts of water get loss with net gas. This study can decrease the desulfurization serosity temperature and reuse moisture and latent heat of flue gas by the way of vacuum distillation to achieve the multiple purposes including energy and water conservation and improving the desulfurization efficiency. In this experiment,we studied distillation characteristics,the condensate water quality and release characteristics of the non-condensable gas under different evaporation temperature difference,cooling water temperature and evaporation pressure by whirling evaporator. Under the experimental conditions of this paper,results showed that the evaporation rate was between 0.07 and 0.77. It increased with an increase in the evaporation temperature difference and decreased with an increase in the cooling water temperature and evaporation pressure. For the condensing water,pH was between 8.14 and 8.33 and its change was small which did not present obvious rules with evaporation pressure,evaporation temperature difference and cooling water temperature rising. The effect of ammonia co concentration becomed weak which was just between 1.25mg/L and 5.26mg/L. It increased with the increase of evaporation pressure and evaporation temperature difference. It becomed weak with the increase of cooling water temperature. SIV ncentration was between 6.13×10–4mol/L and 7.78×10–4mol/L. It increased with the increase of the evaporation temperature difference and evaporation pressure. It decreased with an increase in the cooling water temperature. Total alkalinity existed in the form of HCO3–,changing from10.3mg/L to 20.7mg/L,which has the same regular pattern with ammonia. NH3 producing each unit condensate water,increased with evaporation pressure and cooling water temperature rising. It decreased with evaporation temperature difference increase.

关 键 词：湿法脱硫 真空蒸馏 蒸发温差 冷却水温 蒸发压力 

分 类 号：X78[环境科学与工程—环境工程] TK5[动力工程及工程热物理—热能工程]