超重力尿素湿法烟气脱硝技术的研究

Wet flue gas denitrification using a urea solution and high gravity technology

通过考察氮氧化物湿法吸收机理,对NOx液相吸收的传质理论进行了相关分析。采用定-转子反应器(RSR)作为新型吸收设备,对尿素溶液吸收氮氧化物废气的工艺条件进行了试验研究,考察了液体流量、进气流量、定-转子反应器转速、尿素含量及吸收温度等因素对NOx脱除率的影响,确定了脱除NOx的最佳条件。试验结果表明,对定-转子反应器内部结构为SS-RH这种组合,最佳操作参数为液体流量0.2 m3/h、进气流量0.2 m3/h、定-转子反应器转速1400 r/min、尿素溶液质量分数20%、吸收温度60℃。在此条件下,NOx的脱除率可达到63%。

Based on the wet-process absorption mechanism,a mass transfer theory of NOx absorption by a liquid is introduced.A rotor-stator reactor is proposed as a new type of absorber.The effects of varying the experimental parameters—such as liquid flow,inlet gas flow,rotation speed,concentration of urea,and temperature—have been investigated.The results indicated that the optimum operational parameters of SS-RH were as follows： liquid flow of 0.2 m3/h,inlet gas flow of 0.2 m3/h,rotation speed of 1400 r/min,mass fraction of urea of 20%,and temperature of 60 ℃.Under these conditions,the removal ratio of NOx can reach 63%.