第七章.气态污染物控制.pdfVIP

第七章气态污染物控制 第七章气态污染物控制 1 硫氧化物的控制 1 硫氧化物的控制 Sources of pollution Reaction Elemental Oxidation Oxidation Reaction with NH4+ Reduction form First step Second step with water or other cations Nitrate NH3 N2 NO NO2 HNO3 particles sulfate H S S SO SO H SO 2 2 3 2 4 particles Harmful effects of Sulfur Oxides and Nitrogen Oxides Strong respiratory irritants Secondary Particles and impairing visibility, PM10, PM2.5 Acid rain, Acid deposition Overview of S problem 1. S ( in fuel) + O2 SO2 2. CuFeS + O Cu + FeO + SO 2 2 2 硫排放 硫排放 Removal of SO from the Rich Waste Gases 2 The SO2 concentrations in off-gases from the smelting of metal sulfide ores depend on which process is used and vary with time within the batch smelting cycle. However, they generally range from 2 ~40% SO . 2 Removal of SO2 from rich waste gases SO + O + (V O , catalyst) SO 2 2 2 5 3 SO + H O H SO 3 2 2 4 冶炼厂、硫酸厂和造纸厂等工业，SO 浓度通常2％～40 ％ 2 反应1为放热反应，温度低时转化率高 工业上一般采用多层催化床层 高浓度SO 尾气的回收和净化 高浓度SO 尾气的回收和净化 2 2 高浓度SO 尾气的回收和净化 高浓度SO 尾气