【摘要】 采用ClO₂气相氧化联合CaCO₃浆液吸收工艺对模拟烟气进行同时脱硫脱硝,研究了ClO₂/NO摩尔比、SO₂初始浓度对气相氧化段NO氧化率的影响及液相吸收段中CaCO₃浆液pH、温度和液气比对同时脱硫脱硝效果的影响。结果表明,在气相氧化段,NO的氧化率随着ClO₂/NO摩尔比的增加呈先快速增加后逐渐平稳的变化趋势;在给定的ClO₂/NO摩尔比（0.8）下,随着SO₂初始浓度的增加,NO氧化率稍有下降,高浓度SO2的存在对ClO₂氧化NO的抑制作用有限,说明ClO₂对NO的氧化反应具有良好的选择性。ClO₂气相氧化联合CaCO₃浆液吸收工艺最优反应条件:ClO₂/NO摩尔比为0.8,CaCO₃浆液初始pH为7.0、温度为55℃,液气比为18L/m3。当SO2初始质量浓度为1 000 mg/m³、NO_x初始质量浓度为509 mg/m3时,最佳反应条件下SO₂去除率达100.00%,NO_x去除率达81%左右。更多还原

【Abstract】 Simultaneous desulfurization and denitrification of simulated flue gas was carried out by combining ClO₂ gas phase oxidation and CaCO₃ slurry absorption process.The influence of the ClO₂/NO molar ratio and the SO₂ initial concentration on the oxidation efficiency of NO in the gas phase oxidation section and the effect of the pH and temperature of CaCO₃ slurry absorbent,liquid to gas ratio on the desulfurization and denitrification efficiency were studied.The results show that in the gas phase oxidation section,the oxidation rate of NO was increased first and then steadily with the increase of ClO₂/NO molar ratio.With the increasing of the initial SO₂ concentration,the oxidation rate of NO decreased slightly under the given ClO₂/NO molar ratio（0.8）,means the existence of high concentrate SO₂ had little effect on NO oxidation by ClO₂,which indicated that ClO₂ had good selectivity for the oxidation of NO.When the initial concentration of SO₂ was 1 000mg/m³,the initial concentration of NOxwas 509mg/m³,the optimal reaction conditions of combining ClO₂ gas phase oxidation and CaCO₃ slurry absorption process were as follows:the ClO₂/NO molar ratio was 0.8,the initial pH of CaCO₃ slurry was 7.0,the temperature was 55 ℃,the liquid gas ratio was 18L/m³.Under these optimal conditions,the desulfurization rate reached 100.00% and the denitrification rate was about 81%.更多还原