有机亚砜类催化剂催化氧化脱硫脱硝研究

为了开发简易、有效和成本低的燃煤烟气污染物控制方法,搭建模化试验系统,对有机亚砜类催化剂催化氧化脱硫脱硝一体化技术进行了研究。结果表明,在烟气温度150℃左右,有机亚砜类催化剂可以高效脱除单质汞和硫氧化物,并且可以脱除合成烟气中的大量氮氧化物;通过添加氢氧化铵控制系统pH值,汞脱除效率可达95%;溶液pH6.3,SO_2脱除率99.5%以上,pH4时,SO_2脱除率低于60%;NO_x的脱除取决于烟气中的NO和NO_2的相对形态,实际操作中烟气入口处通入强氧化剂O_3,将NO氧化为N_2O_3和NO_2,再进行后续的脱除,可以保证烟气中氮氧化物的脱除效率不低于80%。结果表明采用有机亚砜类催化剂是在低温条件下处理燃煤烟气多种污染物的可行选择。

Catalytic oxidative desulfurization and denitration of organic sulfoxide catalysts

In order to develop a simple,effective and low-cost control method for coal-fired flue gas,the integrated technology of catalytic oxidative desulfurization and denitration of organic sulfoxide is based on the modeling test system.Results indicate that while the flue gas temperature is about 150 ℃,sulfoxide organic catalyst can remove elemental mercury and sulfur dioxide efficiently,and can remove a large number of nitrogen oxide in flue gas.Controlling system pH by adding ammonium hydroxide,the efficiency of mercury removal can reach 95％.When the pH value is greater than 6.3,the removal rate of sulfur dioxide is above 99.5％,and when the pH value is less than 4,the removal rate of sulfur dioxide is less than 60％.The removal of NOx depends on the form of NO and NO2 relatively in flue gas.In actual operation,the flue gas inlet is connected to the powerful oxidant O3 to oxidize NO to be N2O3 and NO2,then followed by subsequent removal.The removal efficiency of nitrogen oxide in flue gas can guarantee to 80％ or higher.Results indicate that the use of organic sulfone catalysts is a feasible option for the treatment of various pollutants in coal combustion under low temperature.