亚氯酸钠湿法同时脱硫脱硝技术研究

Removal of NO and SO_(2) from Flue Gas by Wet Scrubbing Using Aqueous NaClO_(2) Solution

针对四川省陶瓷行业大气污染物排放所造成的环境问题,以亚氯酸钠为氧化吸收剂,进行模拟烟气的湿法脱硝和脱硫脱硝实验.在脱硝实验中考察了pH、NaClO_(2)质量浓度、NO质量浓度、气体流量等条件对脱硝效率的影响,发现进口烟气量的增加会导致脱硝效率降低,吸收液中NaClO_(2)的质量浓度对脱硝效率影响最大,当pH=5、NaClO_(2)质量浓度为4.0 g/L、NO质量浓度为450 mg/m^(3)、气体流量为800 mL/min时,脱硝效率最高.在此基础上进行同时脱硫脱硝实验,考察NaOH质量浓度和SO_(2)质量浓度对脱硫脱硝效率的影响,发现NaOH质量浓度为0.5 g/L、SO_(2)质量浓度为180 mg/m^(3)时同时脱硫脱硝效率最高,NO_(x)和SO_(2)的最大去除效率分别达到90%和100%,结果显著优于脱硝实验中NO_(x)的最大去除效率(60%).SO_(2)与NO_(x)存在协同去除效应.该研究结果对陶瓷烟气的治理具有实际意义.

Aiming at the environmental problems caused by the emission of air pollutants from the ceramic industry in Sichuan Province,and providing theoretical and technical support for the research and development of the equipment suitable for the local ce-ramic industry air pollutants treatment,this paper takes sodium chlorite as the oxidation absorber,and conducts the wet denitrification and desulfurization denitrification experiments of the simulated flue gas in the laboratory.In the DeNO_(x)experiment,the influence of pH,concentration of NaClO_(2),NO concentration and gas flow rate on DeNO_(x)efficiency was investigated.It was found that the increase of flue gas quantity at the inlet would reduce the denitration efficiency.The concentration of NaClO_(2)in the absorption solution had the greatest influence on DeNO_(x)efficiency.The highest denitration efficiency was observed when pH=5,concentration of NaClO_(2)being 4.0 g/L,concentration of NO being 450 mg/m^(3),and gas flow rate being 800 mL/min On this basis,the experiments of simultaneous desulfurization and denitrification were carried out,and the effects of NaOH concentration and SO_(2)concentration on the efficiency of desulfurization and denitrification were investigated.It was found that when NaOH concentration was 0.5 g/L and SO_(2)concentration was 180 mg/m^(3),the efficiency of simultaneous desulfurization and denitrification was the highest,and the maximum removal efficiency of NO_(x)and SO_(2)could reach 90%and 100%,respectively.The results are significantly better than the maximum removal efficiency of NO_(x)(60%).SO_(2)and NO_(x)have synergistic removal effect.The research results have practical significance for the ceramic industry to deal with air pollutants.