市政污泥流化床掺烧生物质的NO与SO2排放特性研究

为了探究市政污泥燃烧过程中的气态污染物排放特性，在30 kW鼓泡流化床实验台上进行了市政污泥的燃烧实验，研究燃烧温度、二次风率、秸秆掺混比等参数对气态污染物排放特性的影响。结果表明：燃烧温度的升高会显著提高NO与SO₂的排放；提高二次风率使NO排放浓度减少，SO₂排放浓度增加；由于生物质中较低的N、S含量以及生物质与污泥燃烧的协同作用，污泥掺烧生物质能够有效地减少NO与SO₂的排放；秸秆占比由0提升至40%,NO由289 mg/m³下降至140 mg/m³,而SO₂排放浓度也从3 949 mg/m³下降至1 725 mg/m³;污泥掺烧秸秆时，NO与SO₂的整体排放特性与污泥单独焚烧相似，掺烧秸秆能够加快整体的燃烧速率，并加强燃烧气氛的氧化性，进而影响气态污染物的排放。

Study on NO and SO2 emission characteristics of municipal sludge fluidized bed mixed with biomass

In order to explore the emission characteristics of gaseous pollutants during the combustion of municipal sludge, the combustion experiments of municipal sludge were carried out on a 30 kW bubbling fluidized bed test rig, and the effects of combustion temperature, secondary air rate, straw blending ratio and other parameters on the emission characteristics of gaseous pollutants were studied. The results show that the increase of combustion temperature will significantly increase the emission of NO and SO2; increasing the secondary air rate can reduce NO emission concentration and increase SO2 emission concentration; due to the low N and S content in biomass and the synergetic effect of biomass and sludge combustion, sludge blended with biomass can effectively reduce the emission of NO and SO2; the proportion of straw increases from 0 to 40%, NO emission concentration decreases from 289 mg/m3 to 140 mg/m3, and SO2 emission concentration also decreases from 3 949 mg/m3 to 1 725 mg/m3; when the sludge is mixed with straw, the overall emission characteristics of NO and SO2 are similar to that of the sludge incineration alone, the mixing of straw can accelerate the overall combustion rate, strengthen the oxidation of the combustion atmosphere, and then affect the emission of gaseous pollutants