臭氧氧化结合湿法喷淋对玻璃窑炉烟气同时脱硫脱硝实验研究

采用臭氧氧化结合湿法喷淋对模拟玻璃窑炉烟气开展了同时脱硫脱硝实验研究.采用不同溶液(NaOH、Na₂S)进行了喷淋实验.结果表明,保证溶液pH值在10以上,NaOH浓度对NO_x脱除效率无影响,SO₂的存在促进了NO_x吸收.当O₃/NO物质的量比为1.6、溶液NaOH浓度为0.5%时,NO_x脱除效率可达70%,SO₂脱除效率在99%以上.往喷淋液中添加Na₂S,NO_x脱除效率随Na₂S浓度增加而提高,SO₂的存在对NO_x脱除效率无影响.当O₃/NO物质的量比为1.2、溶液中NaOH浓度为0.5%、添加剂Na₂S浓度为0.6%时,NO_x脱除效率可达70%,SO₂脱除效率在95%以上.60 min长时间运行实验证明,模拟烟气中的NO_x经碱液和添加剂吸收后主要以NO^-₂的形式存在于喷淋液中,且NO_x脱除效率不随溶液pH值的变化而变化.

Simultaneous removal of NOx and SO2 from glass furnace flue gas by ozone oxidation and spray tower

The experiment on simultaneous removal of NO_x and SO₂ from glass furnace flue gas by ozone oxidation and spray tower was carried out. The experimental results show that the concentration of the sodium hydroxide as the spray solution has less effect on NO_x removal efficiency when pH is above 10, but SO₂ in the flue gas greatly enhances the NO_x removal. The NO_x removal efficiency reaches 70% and the SO₂ removal efficiency remains above 99% as the concentration of sodium hydroxide (NaOH) is 0.5% and the O₃/NO mol ratio is 1.6. When sodium sulfide (Na₂S) is added into the spray solution, the NO_x removal efficiency is improved and increases with the concentration of Na₂S. During this process, SO₂ has no obvious influence on the NO_x removal; the NO_x removal efficiency reaches 70% and the SO₂ removal efficiency remains above 95% as the concentration of NaOH and Na₂S is 0.5% and 0.6%, respectively, and the O₃/NO mol ratio is 1.2. Long-running experiments (60 min) indicate that NO is transformed into NO₂^- in the solution and the NO_x removal efficiency does not change with the pH value of the spray solution.