尿素添加剂湿法烟气同时脱硫脱氮工艺实验研究(Ⅱ)

Study on the process of simultaneous desulfurization and denitrification from flue gas using urea/additive solution

对EA和PA两种添加剂,工艺条件变化对NOx脱除率影响有相同的规律: NOx脱除率不受烟气的浓度变化影响;随烟气的氧化度和吸收反应塔有效高度的增加而迅速增加。对吸收反应温度、尿素和添加剂质量分数、吸收塔有效高度进行正交实验得出最佳工艺条件为:吸收反应温度70℃;吸收塔有效高度1.8 m;尿素和添加剂质量分数分别为10%和0.01%。在最佳工艺条件作验证实验得出结果与正交实验得出的结果基本符合,此时SO2脱除率为100%,NOx脱除率大于75%。

The process of simultaneous desulfurization and denitrification from flue gas using urea/additive solution was studied. The laboratory experiment results indicated that desulfurization from flue gas using urea/additive solution is easy and removal efficiency of SO 2 exceeds 99%,but removal efficiency of NO x is affected by the process parameters and there is the same rule of affecting removal efficie\| ncy of NO x with the additives of EA and PA,it is not influenced by the concentration of SO 2 and NO x from flue gas and is enhanced with the increasing of oxidation level of flue gas and effective height of absorption tower. An orthogonal experimental design was used to evaluate the behavior of each factor relating to the removal efficiency of SO 2 and NO x,such as absorption reaction temperature,urea and additive concentrations,effective height of absorption tower. Based on these results,the optimum set of operating conditions to confirm the results,>99% SO 2 removal and >75% NO x removal were obtained in flue gas cleaning,with 70℃ of absorption reaction temperature,1.8 m of effective height of absorption tower,10% of urea concentration,0.01% of additive concentration.