【摘要】 自制中试规模的双级串联填料塔,以臭氧（O₃）作为氧化剂,对尿素溶液吸收二氧化硫和氮氧化物的工艺条件进行了实验研究。分析了尿素脱硫脱硝的机理,考察了液体流量、停留时间、臭氧使用量、pH等因素对SO₂和NO_x脱除率的影响。实验结果表明,当液体流量0.8 m³×h^-1、停留时间40 s、尿素溶液质量分数20%、吸收温度50℃、n（O₃）:n（NO）=1:1、pH为7时,SO₂的脱除率接近100%,NO_x的脱除率可达到87.02%。在本一体化烟气脱硫脱硝过程中烟气中SO₂对脱硝效果有协同作用。更多还原

【Abstract】 Absorption of sulfur dioxide and nitrogen oxides with urea solution was studied in a pilot scale double stage tandem packing tower using O₃ as the oxidant, and the mechanism of desulfurization and denitrification was analyzed. Effects of liquid flow rate, residence time, ozone dosage and pH on SO₂ and NO_x removal rates were investigated. The results show that when studied under conditions of liquid flow rate = 0.8 m³×h^-1, residence time = 40 s, mass fraction of urea solution = 20%, absorption temperature = 50℃, n（O₃）:n（NO） = 1:1 and p H = 7, the SO₂ and NO_x removal rates are close to 100% and 87.02%, respectively. Moreover, SO₂ is found to show synergistic effects on denitrification during flue gas desulfurization and denitrification.更多还原