某2 027 t/h锅炉变工况掺烧污泥燃烧特性研究

采用Fluent软件，针对某2 027 t/h四角切圆煤粉锅炉不同负荷下单独燃烧煤粉、煤粉和污泥混烧工况进行了数值模拟，研究了炉内流动、燃烧和NOx排放特性。结果表明：模型能够模拟锅炉燃烧过程，模拟误差在10%以内；掺混污泥对炉内速度场影响较小，掺混污泥后，水分蒸发吸热，炉膛整体温度水平下降，中上层燃烧器区域CO和HCN生成量增加，还原性气氛增强，NOx生成受到抑制；掺混10%比例污泥后，600 MW，510 MW，450 MW工况下平均温度峰值分别降低了15.5 K，8.2 K，3.1 K，NOx排放分别降低10.9%，13.1%，8.1%。

Research on Co-Combustion Characteristics of Sludge and Coal in a 2 027 t/h Boiler under Off-Design Conditions

Using Fluent software,the numerical simulation research was carried out on the combustion conditions of pulverized coal,pulverized coal and sludge mixed burning under different loads in a 2 027 t/h tangential-fired pulverized coal boiler.The flow,combustion and NOx emission characteristics in the furnace were investigated.The simulation results show that the model can reasonably simulate the boiler combustion process,with the simulation error within 10%.After mixing the sludge,the flue gas velocity field in the furnace changes little,the moisture evaporates and absorbs heat,so that the overall temperature of furnace decreases,the production of CO and HCN in middle and upper burners area generation increases,the reducing atmosphere is enhanced,NOx formation is inhibited,the mixing proportion of 10% sludge after the working condition of 600 MW,510 MW and 450 MW average temperature peak respectively decreased by 15.5 K,8.2 K and 3.1 K,and NOx emissions were reduced by 10.9%,13.1% and 8.1% respectively.