选择性催化还原（SCR）作为一种实现氮氧化物超低排放的技术，在垃圾焚烧领域逐渐得到应用。SCR催化剂脱硝效率和使用寿命受到烟气温度、SO₂、H₂O、烟尘等多种因素的影响。经过脱酸和除尘后，垃圾焚烧烟气呈现低温、低酸、低尘、低重金属含量、高含水率的特点，研究发现烟气温度、SO₂、H₂O对催化剂脱硝效率和使用寿命都有较大影响，但SO₂影响最大，同时催化剂本身的催化活性、抗硫性能也是影响脱硝结果的关键因素。

As a technology to achieve ultra-low NO_x emissions, selective catalytic reduction (SCR) has been gradually applied in the field of waste incineration.The denitrification efficiency and service life of SCR catalyst may be affected by many factors, such as flue gas temperature, SO₂, H₂O and soot.After deacidification and dust removal, waste incineration flue gas has characteristics such as low temperature, low acid, low dust, low heavy metal content and high moisture content.It is found that the temperature of flue gas, SO₂ and water all have large impact on the denitrification efficiency and service life of SCR catalyst, of which SO₂ has the biggest impact.Meanwhile, the catalytic activity and sulfur resistance of SCR catalyst itself are also key factors affecting the denitrification results.